CN113977982A

CN113977982A - Production method of high-fiber-content glass fiber reinforced plastic

Info

Publication number: CN113977982A
Application number: CN202111107911.0A
Authority: CN
Inventors: 傅继春
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2022-01-28

Abstract

A production method of high-fiber-content glass fiber reinforced plastic relates to the technical field of glass fiber reinforced plastic processing and forming, and comprises the following steps: s1, preparing a high-fiber-content glass fiber reinforced plastic prepreg; s2, preparing the prepreg into a closed type prepreg; s3, combining a plurality of closed impregnation bodies to form a preform; s4, performing mould pressing, curing and molding on the preformed body through a mould to finally form the glass fiber reinforced plastic product, wherein the obtained glass fiber reinforced plastic product has higher fiber content, and the raw material cost of the glass fiber reinforced plastic product can be reduced by reducing the relative content of resin in the glass fiber reinforced plastic, so that the glass fiber reinforced plastic product is more low-carbon and environment-friendly; the fiber content of the obtained glass fiber reinforced plastic product is higher, and the mechanical property is higher compared with a sheet molding/bulk molding thermosetting composite material; the reinforcing fiber of the glass fiber reinforced plastic product can be dense plain cloth, twill cloth and the like, has high impregnation degree, and is not easy to cause the resin short circuit phenomenon compared with a vacuum infusion method; glass fiber reinforced plastic products with relatively complex shapes can be produced.

Description

Production method of high-fiber-content glass fiber reinforced plastic

Technical Field

The invention relates to the technical field of processing and forming of glass fiber reinforced plastics, in particular to a production method of glass fiber reinforced plastics with high fiber content.

Background

Glass fiber reinforced plastic is a lightweight, high strength material, typically a thermoset resin based fiber reinforced composite. The method is widely applied to the fields of automobiles, ships, wind power and the like. The existing production process of the glass fiber reinforced plastic comprises hand lay-up forming, winding forming, pultrusion forming, compression molding and the like.

The glass fiber reinforced plastic molding process includes the reaction of resin and small amount of curing agent, adding fire retardant to obtain resin paste with relatively high viscosity, and kneading the resin paste with chopped fiber to obtain molding material. The high-strength molding compound with high fiber content can reach 47-51%, and the obtained molding compound is added into a high-temperature mold for mold pressing to obtain a finished product. The compression molding process is easy to prepare products with complex shapes, and has the following defects: the molding compound of continuous fiber or fiber felt is not easy to obtain, the molding compound has organic solvent, the fiber content is low, and the like.

The pultrusion process is that resin and continuous reinforced fiber are soaked in a trough, enter a heating mould and move forward under the action of the pulling force of a tractor. The resin is heated to gel in the die, and the impregnated body is pressed by the die to remove air bubbles, and finally continuously extruded from a die head with a specific shape. The pultrusion is suitable for preparing the glass fiber reinforced plastic product with a specific sectional area, and the product has high fiber content and high mechanical property, and has the defect that the product is not suitable for preparing the product with a complex shape.

Aiming at the advantages and disadvantages of the two processes, the invention provides a production method of a glass fiber reinforced plastic product with high fiber content and relatively complex shape.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a production method of high-fiber-content glass fiber reinforced plastic, which comprises the following specific scheme:

a method for producing high fiber content glass fiber reinforced plastic, the method comprising the steps of:

s1, preparing a high-fiber-content glass fiber reinforced plastic prepreg;

s2, preparing the prepreg into a closed type prepreg;

s3, combining a plurality of closed impregnation bodies to form a preform;

and S4, performing mould pressing, curing and molding on the pre-molded body through a mould, and finally forming the glass fiber reinforced plastic product.

Further, the preformed body consists of a plurality of closed impregnation bodies and interlayer bonding felts, and the connecting positions of two adjacent closed impregnation bodies are bonded through the interlayer bonding felts;

the closed impregnation body is of a closed sandwich structure and consists of a prepreg and two layers of surface films, wherein the prepreg is positioned between the two layers of surface films, the two layers of surface films are completely attached and wrap the prepreg, and the periphery of the closed impregnation body is sealed;

the prepreg comprises thermosetting mixed resin and reinforcing fibers, wherein the thermosetting mixed resin has initial viscosity, comprises a thermosetting resin body, a curing agent, an accelerator and a flame retardant and is impregnated in the reinforcing fibers, the surface film comprises semi-cured thermosetting resin and reinforcing fibers, and the semi-cured thermosetting resin has initial strength;

the composition of the interlaminar bonding mat is the same as that of the prepreg, in an uncured state with a certain viscosity;

before the molding, curing and forming stage of the closed impregnation body, the resin mixture system in the closed impregnation body is not completely cured and still has plasticity.

Further, in the step S2, preparing the prepreg into a closed-type prepreg employs a double steel belt press, which includes a press body, a film-sticking assembly and an outer transmission frame;

the prepreg manufacturing device comprises a press body, a plurality of prepregs and a plurality of control units, wherein the press body is provided with a feeding end and a discharging end which are arranged on different sides, and comprises a press framework, an upper steel belt, a lower steel belt and a steel belt roller, the upper steel belt, the lower steel belt and the steel belt roller are arranged in the press framework from top to bottom, the prepregs are driven by the upper steel belt and the lower steel belt to move from the feeding end to the discharging end, and the upper steel belt and the lower steel belt are matched to continuously apply temperature and pressure to the prepregs;

the film sticking assembly is arranged on the press framework and close to the discharge end and used for sealing the prepreg between two layers of surface films to form the closed-type impregnated body;

and the outer transmission frame is used for transferring the closed impregnation body separated from the film pasting component and secondarily heating and curing the joint of the two sides of the two layers of surface films on the closed impregnation body.

Furthermore, two rows of steel belt rollers are arranged on the upper portion and the lower portion of the press framework, and the steel belt rollers can be adjusted in the upper position, the lower position, the left position and the right position relative to the press framework;

the steel belt rollers in the upper row are divided into an upper left steel belt roller and an upper right steel belt roller which are used for driving the upper steel belt to circularly run;

the steel belt rollers at the lower row are divided into a lower left steel belt roller and a lower right steel belt roller which are used for driving the lower steel belt to circularly run together;

at least one of the steel belt rollers in each row is a driving roller, and the linear speeds of the driving rollers are the same.

The pressing machine body further comprises pressing plates, pressing plate pressing machines and pressing plate pressing rollers, the pressing plates are arranged into a plurality of pressing plate groups which are arranged in an up-down corresponding mode, at least one pressing plate in each pressing plate group is connected with the pressing plate pressing machines, and the pressing plate pressing machines are assembled on the pressing machine framework;

the surface of each pressing plate is provided with the pressing plate pressing roller, the surface of each pressing plate pressing roller and the surface of each pressing plate are provided with height differences, and the pressing plates and the pressing plate pressing rollers are in contact with the inner surface of the upper steel belt or the inner surface of the lower steel belt together to apply pressure.

Further, the film pasting component comprises a resin coating roller, a resin coating groove, a lower surface film pasting sub component and an upper surface film pasting sub component;

the resin coating roller is an axially rotatable roller with a space formed in the middle, the space is used for the upper surface film to pass through, and the resin coating tank is provided with a resin discharge hole used for contacting with the upper surface film;

the upper surface film attaching subassembly is arranged on the rear side of the upper left steel strip roller and is used for attaching the upper surface film to the upper surface of the prepreg, and comprises an upper scraper blade and an upper surface film conveying roller group, wherein the upper scraper blade is provided with a sharp-angled structure, the sharp-angled structure can be arranged in contact with the surface of the upper steel strip and is used for scraping the prepreg from the upper steel strip, the interval between the upper surface film conveying roller group is equal to or smaller than the thickness of the prepreg, the upper scraper blade is positioned above the upper surface film conveying roller group, and an upper surface film channel is formed between the upper scraper blade and the upper surface film conveying roller;

the lower surface film attaching subassembly is arranged on the rear side of the lower left steel belt roller and comprises a lower scraping plate and a lower surface film conveying roller group, wherein the lower scraping plate is provided with a sharp-angle structure, the sharp-angle structure can be in contact with the surface of the lower steel belt and is used for scraping the prepreg from the lower steel belt, the lower surface film conveying roller group is used for attaching the lower surface film to the lower surface of the prepreg and comprises two lower surface film conveying rollers horizontally and adjacently arranged, and a lower surface film channel is formed between the lower surface film conveying roller group and the lower scraping plate.

Further, the upper portion of lower scraper blade is the plane setting, be equipped with first clearance between the plane with the surface of going up the steel band, first clearance slightly is greater than the thickness of prepreg, be equipped with the second clearance between lower surface membrane transfer roller group with go up the steel band, the second clearance is less than first clearance.

Furthermore, the bottom of the press frame is respectively provided with a left frame base and a right frame base along the two ends in the length direction, and the height of the left frame base is higher than that of the right frame base.

Furthermore, the sections of the upper steel belt and the lower steel belt are in a straight shape, and two sides of the lower steel belt along the running direction are respectively provided with an anti-overflow inclined plate;

the pressing plate is detachably provided with a drawer-shaped cooling groove close to the film sticking assembly, and the cooling groove is located outside the press framework.

Further, the outer transmission frame comprises an outer transmission frame framework, transmission rollers and a heating sheet set, the transmission rollers comprise a plurality of groups of axially rotatable rollers which are correspondingly arranged up and down, and the distance between the transmission rollers is equal to or slightly smaller than the thickness of the closed impregnation body;

the heating plate groups are arranged at the two ends of the conveying roller in the axial direction, and heating gaps are formed on the heating plate groups.

Compared with the prior art, the invention has the following beneficial effects:

(1) the final glass fiber reinforced plastic product, i.e. high fiber content glass fiber reinforced plastic, is essentially prepreg → closed impregnant → preforming body → glass fiber reinforced plastic product, wherein the initial raw material is the prepreg of high fiber content glass fiber reinforced plastic, and then the glass fiber reinforced plastic product is gradually formed by one step, therefore, the invention adopts the mode that the usage amount of resin is reduced from the beginning of the raw material, thereby improving the fiber content and the impregnation completeness of the raw material, realizing the purpose of reducing the raw material cost of the glass fiber reinforced plastic and improving the mechanical property of the glass fiber reinforced plastic, then the prepreg is formed into the closed impregnant with complex shape, and then the preforming body with complex shape is formed, finally the glass fiber reinforced plastic product with complex shape is formed by the mode of mould pressing, and for review, the invention is based on the glass fiber reinforced plastic mould pressing forming process, realizes the relative complex shape, the glass fiber reinforced plastic product with complex shape, And (3) preparing the glass fiber reinforced plastic product with higher fiber content.

Therefore, in the invention, the fiber content of the obtained glass fiber reinforced plastic product is higher, the raw material cost of the glass fiber reinforced plastic product can be reduced by reducing the relative content of resin in the glass fiber reinforced plastic, and the glass fiber reinforced plastic product is lower in carbon and more environment-friendly; the fiber content of the obtained glass fiber reinforced plastic product is higher, and the mechanical property is higher compared with a sheet molding/bulk molding thermosetting composite material; the reinforcing fiber of the glass fiber reinforced plastic product can be dense plain cloth, twill cloth and the like, has high impregnation degree, and is not easy to cause the resin short circuit phenomenon compared with a vacuum infusion method; glass fiber reinforced plastic products with relatively complex shapes can be produced.

(2) Through the arrangement of the double-steel-belt press, the reinforced fiber felt containing a large amount of mixed resin for impregnation is used as a feeding material and enters between the upper steel belt and the lower steel belt from the feeding end of the press body, and redundant resin and gas are squeezed and removed through the structures such as the upper steel belt and the lower steel belt, so that the fiber content is higher, and the impregnation degree is better. Meanwhile, the lower steel belt is cleaned by the steel belt scraper, so that the production can be continuous. Through the pad pasting subassembly supporting with the press body, with upper surface membrane, lower surface membrane laminating in the surface of prepreg, inside the protection prepreg reduces gaseous infiltration prepreg simultaneously, forms the closed steeping body of primary forming, through the transmission of outer transmission frame and the local heating of heating plate, obtains the closed steeping body of airtight structure. The preparation of the prepreg and the closed type prepreg can be simultaneously finished after a whole set of flow of the double-steel belt press, continuous production can be realized, and the production cost is saved.

And then, bonding the closed impregnation body by interlayer bonding felts to form a preformed body with a complex shape, paving the preformed body in a mould, and carrying out mould pressing and heating molding to obtain the glass fiber reinforced plastic product.

(3) The closed type impregnant comprises a prepreg and a surface film, the whole body is a compact sandwich structure, the prepreg is located in a central layer of the sandwich structure, and occupies most of the thickness of the closed type impregnant, the fiber content of the prepreg is higher, the impregnation degree is better, the prepreg is completely coated by the surface film, air cannot permeate into the prepreg through a surface film surface layer or the surrounding gaps, in addition, the surface film is arranged to be a resin film with certain strength, the chemical property of the resin film is the same as or similar to that of the prepreg, the prepreg is protected, the whole strength of the closed type impregnant can be ensured in the subsequent process, and therefore the preparation of a high-fiber-content and high-strength glass fiber reinforced plastic product is realized.

Drawings

FIG. 1 is a schematic view of a three-layer structure constituting a closed impregnation body;

FIG. 2 is a schematic view of the whole of a closed-type impregnation body;

FIG. 3 is a schematic representation of a three-layer structure for forming a preform;

FIG. 4 is a schematic view of a preform and a mold corresponding thereto;

FIG. 5 is an overall schematic view of a double steel belt press;

FIG. 6 is an overall schematic view of the press body;

FIG. 7 is a simplified schematic diagram showing the upper and lower steel belts in the press body;

FIG. 8 is an overall schematic view of the outer transport frame;

FIG. 9 is a schematic view showing a steel band roller stop;

FIG. 10 is a schematic view showing a steel belt scraper;

FIG. 11 is a schematic view of the entire film sticking assembly;

FIG. 12 is a schematic overall view of the topfilm subassembly;

FIG. 13 is a simplified schematic of a surface film-on subassembly;

FIG. 14 is an overall schematic view of a sub-assembly of the subbing film;

FIG. 15 is a simplified schematic of a sub-assembly of the undersurface film;

fig. 16 is a simplified schematic diagram of a patch assembly showing the top and bottom surface film paths.

Reference numerals: A. a preform; a-1, a closed impregnation body; a-2, interlayer bonding felt; a-1-1, prepreg; a-1-2, surface film; B. a mold; C. a press body; c-1, a steel belt roller; c-1-1, a steel belt roller limiting block; c-1-2, an upper limiting device and a lower limiting device; c-1-3, a left limiting device and a right limiting device; c-1-5, a limiting block supporting plate; c-2-1, a steel belt scraper; c-2-2, feeding a steel belt; c-2-3, arranging a steel belt; c-2-4, an anti-overflow inclined plate; c-3, pressing machine framework; c-3-1, a left framework base; c-3-2, right skeleton base; c-4, pressing a plate; c-4-1, pressing a plate press; c-4-2, pressing a plate and a press roller; c-5, a cooling tank; D. a film pasting component; d-1, coating a resin roller; d-1-1, coating a resin tank; d-2, a sub-assembly of the subsurface membrane; d-2-1, a lower scraper; d-2-2, a lower surface film conveying roller set; d-2-3, a film pasting component limiting device; d-3, attaching a surface film subassembly; d-3-1, an upper scraper plate; d-3-2, arranging a surface film conveying roller set; E. an outer transport frame; e-1, a conveying roller; e-2, an outer transmission frame framework; e-3, heating the sheet group.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.

A production method of high-fiber-content glass fiber reinforced plastic comprises the following steps:

s1, preparing a high-fiber-content glass fiber reinforced plastic prepreg A-1-1;

s2, preparing the prepreg A-1-1 into a closed type prepreg A-1;

s3, combining a plurality of closed impregnation bodies A-1 to form a preform A;

and S4, carrying out mould pressing, curing and molding on the preform A through a mould B, and finally forming the glass fiber reinforced plastic product.

From the above four steps, it can be seen that the high fiber content glass fiber reinforced plastic is prepreg a-1-1 → closed type prepreg a-1 → preform a → glass fiber reinforced plastic product, and is gradually formed from the initial raw material step by step, that is, the high fiber content glass fiber reinforced plastic is in different forms in different production steps, therefore, the present invention discloses the specific content of the high fiber content glass fiber reinforced plastic in different forms.

The preform a in step S3 is composed of a plurality of closed-end impregnations a-1 and interlayer bonding mats a-2, and the joint positions of two adjacent closed-end impregnations a-1 are bonded by the interlayer bonding mats a-2.

In step S2, the closed impregnation body A-1 is a closed sandwich structure composed of a prepreg A-1-1 and two surface films A-1-2, the prepreg A-1-1 is located between the two surface films A-1-2, the two surface films A-1-2 are completely attached to and wrap the prepreg A-1-1, and the periphery of the closed impregnation body A-1 is sealed.

In step S1, the prepreg a-1-1 is composed of a thermosetting mixed resin having an initial viscosity and reinforcing fibers, and the surface film a-1-2 is composed of a semi-cured thermosetting resin having an initial strength and reinforcing fibers.

In detail, the prepreg A-1-1 is used as an uncured thermosetting resin/fiber reinforcement composite material, and its components include a thermosetting resin mixture as a matrix, and reinforcing fibers as a reinforcement. The thermosetting resin mixture contained in the prepreg A-1-1 comprises a thermosetting resin body, a curing agent, an accelerator, a flame retardant and other components, all the components are uniformly mixed, the thermosetting resin body and the curing agent can spontaneously carry out chemical crosslinking reaction, and the molecular weight is larger and the fluidity is lower and lower along with the advance of time until the thermosetting resin mixture becomes a hard solid. The resin mixture system has a higher curing temperature compared to room temperature. In the initial stage of the homogeneous mixing of the components, the viscosity of the resin mixture system is low and the reinforcing fibers can be completely impregnated. In addition, in the molding stage from the discharging of the prepreg A-1-1 to the die pressing, the thermosetting resin mixture still has plasticity; at the same time, the resin mixture did not significantly exotherm at this stage. The prepreg A-1-1 contains a fiber reinforcement, the fiber of which is a reinforcing fiber such as a glass fiber or a carbon fiber, and the structure of which is a multilayer continuous fiber cloth, and the structure of which can be plain cloth, twill cloth or other dense continuous fiber cloth.

The prepreg A-1-1 is also characterized by a high content of reinforcing fibers and a high degree of impregnation of resin and fibers. Prepreg A-1-1 is a dimensional feature that may be continuous or discontinuous in the length direction, may be equally or unequally spaced in the width direction, and may be only equally thick in the thickness direction.

The surface film A-1-2 serves as a film attached to both side surfaces of the prepreg A-1-1, and functions to prevent air from penetrating into the prepreg A-1-1 and to make the prepreg A-1-1 easy to pick up. The components of the surface film A-1-2 comprise thermosetting resin with higher curing degree and long reinforcing fiber, and the chemical components of the resin used by the surface film A-1-2 are the same as or similar to the thermosetting mixed resin in the prepreg A-1-1, so that the purpose of good compatibility of the surface film A-1-2 and the prepreg A-1-1 is realized. The difference is that the resin used in the surface film A-1-2 has high curing degree, and the resin contains long reinforced fiber or ultrathin reinforced fiber cloth, has certain strength and is not easy to damage in the using process. In addition, to ensure complete coverage, the thickness of the surface film A-1-2 is much less than the thickness of the prepreg A-1-1, the width of the surface film A-1-2 is greater than the width of the prepreg A-1-1, the prepreg A-1-1 can be completely covered, and the surface film A-1-2 is continuous in the length direction.

Two surface films A-1-2 are attached to the upper surface and the lower surface of the prepreg A-1-1 to form a sandwich structure, and the closed prepreg A-1 is formed together. After the closed-type impregnated body A-1 is formed, the prepreg A-1-1 is completely covered with the upper and lower surface films A-1-2, and air cannot penetrate at the position where the upper and lower surface films are attached to each other. Namely, the upper surface film A-1 and the lower surface film A-2 are sealed and attached at the edges to form a bagged closed space, and the prepreg A-1-1 completely fills the closed space. It is to be noted that, first, the prepreg A-1-1 in the closed-type impregnated body A-1 contains no or few bubbles. Second, the closed-end prepreg A-1 leaving from the discharge end after the subsequent press body treatment is continuous in the longitudinal direction even if the prepreg A-1-1 is discontinuous. Third, the closed impregnation body a-1 has a certain plasticity during the molding process, and does not undergo severe curing before molding.

As shown in FIG. 1, three layers constituting a closed-type prepreg A-1 are provided, including a prepreg A-1-1 and a surface film A-1-2. As shown in FIG. 2, the whole of the closed-type impregnated body A-1 is shown. The structure of the closed impregnation body A-1 is a closed sandwich structure. Two layers of upper and lower surfaces of the bag cover the central layer completely, the two layers of upper and lower surfaces are sealed all around to form a bag structure, the central layer is fully filled in the bag structure, air can not permeate the bag structure, and the thickness of the central layer is far higher than that of the surface layer.

As a connection structure between the closed impregnates A-1, the interlaminar bonding mat A-2 is a fiber mat impregnated with a thermosetting mixed resin in a semi-gel state having no film structure on the surface and not requiring a high fiber content, the composition of which is the same as that of the prepreg A-1-1. The thermosetting mixed resin has the same or similar chemical property with the resin forming the surface film A-1-2, and has good compatibility and low curing degree. The interlayer adhesive mat A-2 is a prepreg mat having the same composition as the prepreg A-1-1, and therefore, the interlayer adhesive mat A-2 functions to bond a plurality of closed-type impregnates A-1 to form a preform A having a complicated structure. The interlayer bonding felt A-2 is positioned at the mutual connection position of the two layers of closed impregnants A-1, and in the compression molding stage, the thermosetting mixed resin in the interlayer bonding felt A-2 is heated and cured and plays a role in bonding the two layers of closed impregnants A-1 under the action of certain pressure.

The preform a needs to have a certain plasticity as a state before the final glass fiber reinforced plastic product is press-molded, and the shape thereof can be attached to the surface of the mold B. The structure is that a plurality of sheet-shaped closed steeping bodies A-1 with different shapes are combined together, and the combined positions of the closed steeping bodies A-1 are connected through interlayer bonding felts A-2.

An exemplary composite structure of preform a is shown in fig. 3. The preformed body A is formed by combining a closed impregnation body A-1 and an interlayer bonding felt A-2. As shown in fig. 3, the upper small closed-type impregnated body a-1 is bonded to the lower larger closed-type impregnated body a-1 by the intermediate interlayer bonding mat a-2. By way of example in fig. 4, a rectangular closed impregnation body a-1 is bonded to another back closed impregnation body a-1 at the bonding position by means of two elongated interlaminar bonding felts a-2. In the form curing stage, the resin in the interlaminar bonding mat A-2 is cured along with the other resins, and a small amount of gas is removed under pressure to fuse with the other components.

As shown in fig. 4, a preform a and a mold B corresponding thereto are shown. The shape of the preform A is matched with the surface of the mold B, and the preform A is attached to the surface of the mold B. And preparing the preformed body A into a glass fiber reinforced plastic product through molding modes such as hot die pressing.

After disclosing the specific contents of the prepreg A-1-1, the closed-type impregnated body A-1 and the pre-formed body A, it can be known that the operations of the steps S1, 3 and S4 are all simpler, and the other important point of the invention is that in the step S2, a double-steel-belt press is adopted for preparing the prepreg A-1-1 into the closed-type impregnated body A-1, and the double-steel-belt press is used as main equipment in the production method of the glass fiber reinforced plastic, and the specific description is as follows.

Fig. 5 is a schematic view showing the overall structure of a double steel belt press for preparing a closed impregnated body a-1, which is an improved double steel belt press compared with the prior art. The existing double-steel belt press on the market is equipment for preparing thermoplastic resin composite material sheets, and the existing double-steel belt press is suitable for processing thermosetting composite materials by improving the following steps. The specific description is as follows:

the double-steel-belt press comprises a press body C, a film pasting assembly D and an outer transmission frame E, and the prepreg A-1-1 fed into the double-steel-belt press and the surface film A-1-2 fed into the film pasting assembly D are automatically manufactured into a closed type prepreg A-1 through the cooperation of the press body C, the film pasting assembly D and the outer transmission frame E. For the sake of convenience of distinguishing and describing the surface film A-1-2 above and below the prepreg A-1-1, the two surface films A-1-2 are referred to as a top surface film and a bottom surface film, respectively, in the following.

The press body C is used as core equipment for preparing the closed prepreg A-1, a feeding end and a discharging end are formed on the press body C, the feeding end is arranged on the opposite side of the press body C and used for leading in the prepreg A-1-1, and the discharging end is used for leading out the prepreg A-1-1. In detail, the press body C comprises a press framework C-3, an upper steel belt C-2-2, a lower steel belt C-2-3, a steel belt roller C-1, a pressing plate C-4, a pressing plate press C-4-1 and a pressing plate pressing roller C-4-2, wherein the upper steel belt C-2-2 and the lower steel belt C-2-3 are arranged in the press framework C-3 in an upper and lower mode, under the coordination of other structures such as the steel belt roller C-1 and the pressing plate C-4, the steel belt drives the prepreg A-1-1 to move from a feeding end to a discharging end, and the steel belt continuously applies temperature and pressure to the prepreg A-1-1. When the prepreg A-1-1 is about to leave the press body C during the operation of the press body C, the film sticking assembly D is then fitted with the prepreg A-1-1 at the discharge end to form a preliminarily fastened closed prepreg A-1.

Two rows of steel belt rollers C-1 which are arranged in a staggered manner in the vertical direction are arranged above and below the press framework C-3, the steel belt rollers C-1 in the upper row are divided into an upper left steel belt roller and an upper right steel belt roller and are jointly used for driving the upper steel belt C-2-2 to circularly run, the steel belt rollers C-1 in the lower row are divided into a lower left steel belt roller and a lower right steel belt roller and are jointly used for driving the lower steel belt C-2-3 to circularly run, at least one of the steel belt rollers C-1 in each row is a driving roller and can be connected through a motor, and the linear speeds of the driving rollers are the same. When the steel belt roller C-1 runs, the upper steel belt C-2-2 and the lower steel belt C-2-3 are driven to do periodic circumambulation motion through the pressure and friction action.

Different from the existing steel belt rollers C-1 which are symmetrically arranged up and down, the upper left steel belt roller and the lower left steel belt roller are arranged left to right in the vertical direction in the press framework C-3 close to the discharging end, so that the situation that the surface of the lower scraping plate D-2-1 in the follow-up lower surface film sub assembly D-2 cannot provide forward power for the material is considered, and the material is driven to move forward by the operation of the upper steel belt C-2-2. If the upper left steel belt roller and the lower left steel belt roller are symmetrically arranged, the scraper surfaces of the upper scraper D-3-1 and the lower scraper D-2-1 which are arranged up and down are also symmetrical, and the risk of blocking is caused after the materials run between the scraper surfaces. Therefore, by arranging the left and right upper and lower left steel belt rollers, the upper scraper D-3-1 and the lower scraper D-2-1 which are arranged up and down are staggered, so that the material can pass through the upper and lower left steel belt rollers conveniently, and the possibility of blockage in the material running process is reduced.

After long-time work, the upper steel belt C-2-2 and the lower steel belt C-2-3 may deviate in position, optimally, the steel belt roller C-1 can adjust the up-down position and the left-right position relative to the press framework C-3, the up-down position and the left-right position of the steel belt roller C-1 are adjusted through the steel belt roller C-1 limiting block, the up-down position, the left-right position and the left-right position of the upper steel belt C-2-2 and the lower steel belt C-2-3 are further adjusted, and meanwhile, large-scale deviation in the width direction of the upper steel belt C-2-2 and the lower steel belt C-2-3 is avoided. The steel belt roller C-1 limiting block is attached to the presser framework C-3 but is not fixed on the presser framework C-3. Taking the limiting block of the steel belt roller C-1 at the lower left as an example, as shown in fig. 9, a rectangular hole is formed in the center of the limiting block, the width of the rectangular hole is equal to or slightly larger than the diameter of the steel belt roller C-1 inserted therein, and the limiting block can drive the steel belt roller C-1 to move when moving through the rectangular hole. The left side and the right side of the limiting block are both provided with a hole plate which is fixed on the limiting block; a perforated plate fixed on the press framework C-3 is arranged adjacent to the upper plate. Two adjacent perforated plates which are arranged close to each other are connected by a firm limiting screw to form a left limiting device C-1-3 and a right limiting device C-1-3. The left and right positions of the limiting block are indirectly adjusted by adjusting the tightness of the limiting screw, and the left and right positions of the steel belt roller C-1 are indirectly adjusted. The perforated plate on the steel strip roller C-1 is in the shape of a ring with the middle and flat plates at two sides, and the steel strip roller C-1 is inserted into the ring. The upper and lower limiting devices C-1-2 are formed by the strip hole plate corresponding to the steel strip roller C-1 and the strip hole plate fixed on the limiting block through corresponding limiting screws and are used for adjusting the upper and lower positions of the steel strip roller C-1. Preferably, a limiting block supporting plate C-1-5 is arranged at the lower part of a limiting block of the steel strip roller C-1, is connected to a press framework C-3, is in contact with the limiting block of the steel strip roller C-1 but is not fixedly connected with the limiting block, and can bear part of the gravity of the steel strip roller C-1.

Before the equipment runs, the specific position of the steel belt roller C-1 is adjusted through the left limiting device C-1-3, the right limiting device C-1-3 and the upper limiting device C-1-2, so that the distance between the steel belt rollers C-1 is the thickness suitable for materials to pass through, and pressure can be normally generated between the steel belt roller C-1 and a steel belt. It should be noted that the arrangement of the limiting block is only one of the devices capable of adjusting the position of the steel belt roller C-1, and therefore, the left and right limiting devices C-1-3 and the upper and lower limiting devices C-1-2 corresponding to the steel belt roller C-1 are not structurally limited in the invention.

As shown in FIG. 7, the upper steel band C-2-2 and the lower steel band C-2-3 are both closed ring structures, and since the upper and lower steel band rollers C-1 are not positioned correspondingly, in the present invention, the left end of the upper steel band C-2-2 extends more to the left than the lower steel band C-2-3, and the right end of the lower steel band C-2-3 extends more to the right than the upper steel band C-2-2, the cross-sections of the upper steel band C-2-2 and the lower steel band C-2-3 are in a straight line shape, and the two sides of the lower steel band C-2-3 along the running direction are respectively provided with anti-overflow inclined plates C-2-4, which are actually integrated with the lower steel band C-2-3 and form an obtuse angle therebetween, so that the cross section of the lower steel belt C-2-3 in the width direction is

The width of the upper steel belt C-2-2 is smaller than the axial length of the upper left steel belt roller C-1 and the upper right steel belt roller, the width of the upper steel belt C-2-2 is smaller than or equal to the width of the lower steel belt C-2-3 except the anti-overflow inclined plate C-2-4, and the whole width of the lower steel belt C-2-3 is smaller than the axial length of the lower left steel belt roller and the lower right steel belt roller.

In order to realize that materials are simultaneously pressurized in the process of advancing between an upper steel belt C-2-2 and a lower steel belt C-2-3, as shown in figures 6 and 7, a plurality of groups of press plates C-4 which are correspondingly arranged up and down are arranged on the press plates C-4, the press plates C-4 are divided into an upper press plate C-4 and a lower press plate C-4, at least one press plate C-4 in each group of press plate C-4 is connected with a press plate C-4-1, the press plate C-4-1 is assembled on a press frame C-3, and the press plate C-4-1 provides up and down pressure in the operation process of the equipment, so that pressure is generated between the corresponding upper press plate C-4 and the corresponding lower press plate C-4, and further acts on a prepreg A-1-1, and the excess resin and air are removed. Preferably, the surface of each pressing plate C-4 is provided with a pressing plate pressing roller C-4-2, the surface of the pressing plate pressing roller C-4-2 and the surface of the pressing plate C-4 are provided with a height difference, the height difference is only used for enabling the pressing plate pressing roller C-4-2 to slightly protrude out of the plane of the pressing plate C-4, the pressing plate pressing roller C-4-2 can rotate around the self axial direction and can be a driving roller or a driven roller, and the linear speed is the same as the running speed of the steel belt. During the operation of the apparatus, the press plate C-4 and the press plate roll C-4-2 are brought into contact with the inner surface of the upper steel strip C-2-2 or the lower steel strip C-2-3 together to apply pressure, and the removal of excess resin and air from the prepreg A-1-1 is further achieved by the rotation of the press plate roll C-4-2.

In the operation process of the equipment, a large amount of mixed resin impregnated reinforced fiber felt is used as a feed material, enters between an upper steel belt C-2-2 and a lower steel belt C-2-3 from the feed end of a press body C, and continuously moves towards the discharge end under the pressure action of the upper steel belt C-2-2, the lower steel belt C-2-3, a pressing plate C-4 and a pressing plate pressing roller C-4-2. Meanwhile, the materials are pressed to discharge redundant resin and air, the redundant resin flows to the two sides of the lower steel belt C-2-3 and is blocked by the anti-overflow inclined plates C-2-4 on the two sides and cannot flow to the ground, the resin is less in residual amount on the lower steel belt C-2-3 under the action of the steel belt scraper C-2-1, and the resin is gradually collected under the scraping action of the steel belt scraper C-2-1. As the extruded resin has rheological property, in order to reduce the pollution to the equipment, as shown in figure 10, a steel belt scraper C-2-1 is arranged on a lower steel belt C-2-3, the steel belt scraper C-2-1 is arranged on a press framework C-3, a cutter head is contacted with the lower steel belt C-2-3, and two sides in the width direction are respectively provided with one cutter head. Meanwhile, a left framework base C-3-1 and a right framework base C-3-2 are respectively arranged at the two ends of the bottom of the press framework C-3 along the length direction of the press framework C-3, the height of the left framework base C-3-1 is higher than that of the right framework base C-3-2, and under the action of gravity, the left end of the press framework C-3 is higher than that of the right end, resin at the two sides of the lower steel belt C-2-3 flows to the right end under the action of inertia and is collected.

As shown in figures 6 and 7, a cooling tank C-5 is arranged on the left side of a press framework C-3, the cooling tank C-5 is a drawer-shaped tank made of metal and the like with good heat conductivity, and the cooling tank C-5 is detachably and fixedly connected with a pressure plate C-4 on the leftmost side and has the function of cooling the material passing through the position of the cooling tank C-5 so as to improve the viscosity of the resin in the prepreg A-1-1 and prevent the resin from being solidified at an excessive speed. Except the surface close to the steel strip, the rest surfaces are coated with aerogel heat insulation pads, and cooling substances such as ice water and the like are filled in the aerogel heat insulation pads. During the operation of the apparatus, the prepreg A-1-1 is moved to the vicinity of the cooling bath C-5, and the resin in the prepreg A-1-1 is cooled. Because the resin in the prepreg A-1-1 is inevitably partially cured in the running process, the viscosity and the temperature of the resin are increased, and after the prepreg A-1-1 is cooled, the viscosity of the resin in the prepreg can be further increased, and the subsequent curing speed is reduced. The increase of the internal resin viscosity can reduce the risk of air infiltration into the prepreg A-1-1 during the discharging process, and the reduction of the subsequent curing speed can lead to a longer shelf life of the subsequent closed prepreg A-1 before molding.

To reduce the likelihood that prepreg A-1-1 will be affected by the environment after it has exited the discharge end, a film attachment assembly D is mounted to the press frame C-3 adjacent the discharge end for sealing prepreg A-1-1 between the two surface films A-1-2 to form a closed prepreg A-1. The film pasting component D comprises a resin coating roller D-1, a resin coating groove D-1-1, a lower surface film pasting sub component D-2 and an upper surface film pasting sub component D-3. Fig. 11 is a schematic structural view of the film sticking assembly D. FIGS. 12-13 are schematic structural views of the topfilm subassembly D-3; fig. 14-15 are schematic structural views of the sub-assembly D-2 with the undersurface film applied thereto.

As shown in FIG. 11, the resin coating roll D-1 is a pair of rolls positioned at the upper surface film feeding section, and is specifically provided as two axially rotatable rolls having a gap formed therebetween, the gap between the rolls being small, and the upper surface film being passed between the resin coating roll D-1 and running. The coating resin tank D-1-1 is provided with a through hole and can be connected to an external device such as a resin mixer, etc., to temporarily store an adhesive resin, the adhesive resin is a uniform mixture of a thermosetting resin and a curing agent, and the adhesive resin may be a resin having a high curing speed and a low curing temperature or a resin having a much higher viscosity than the resin in the prepreg a-1-1, and it should be noted that the chemical compatibility between the adhesive resin and the resin in the prepreg a-1-1 is good. The resin curing device is used for bonding the upper surface film and the lower surface film together to form a closed structure, the resin coating tank D-1-1 is provided with a resin discharge port used for being in contact with the upper surface film, the resin coating tank D-1-1 is used for primarily coating adhesive resin on the upper surface film, and the adhesive resin is uniformly coated on the upper surface film through the resin coating roller D-1, so that the inner surface of the upper surface film is coated with a layer of adhesive resin.

Shown in fig. 14-15 is a bottom surface film sub-assembly D-2, which bottom surface film sub-assembly D-2 is provided on the rear side of the lower left steel belt roll. The lower surface film attaching subassembly D-2 comprises a lower scraping plate D-2-1 and a lower surface film conveying roller group D-2-2, the lower surface film conveying roller group D-2-2 is used for attaching a lower surface film to the lower surface of the prepreg A-1-1, the lower surface film attaching subassembly comprises two lower surface film conveying rollers which are horizontally and adjacently arranged, one lower surface film conveying roller is arranged close to the lower scraping plate D-2-1, and a lower surface film channel is formed between the lower surface film conveying roller group D-2-2 and the lower scraping plate D-2-1. The lower surface film advances from the lower surface film channel between the lower scraper D-2-1 and the lower surface film conveying roller, and under the common supporting action of the two horizontally arranged lower surface film conveying rollers, the phenomenon that the follow-up prepreg A-1-1 sags under the influence of gravity in the process of running from the lower surface film conveying roller group D-2-2 to the upper surface film conveying roller group D-3-2 is avoided, and meanwhile, the risk of air permeating into the prepreg A-1-1 is reduced.

The lower blade D-2-1 is shaped as shown in FIG. 15 and is provided as a plate having a fixed-shape cross section and a length longer than the width of the prepreg A-1-1, and is formed with a pointed structure which is located near the lower portion of the uppermost portion of the roll C-1 of the lower steel strip C-2-3 and is located in contact with the surface of the lower steel strip C-2-3 for scraping the prepreg A-1-1 off the lower steel strip C-2-3. The upper part of the lower scraper D-2-1 is arranged in a plane, a first gap is arranged between the plane and the surface of the upper steel belt C-2-2, the first gap is slightly larger than the thickness of the prepreg A-1-1, a second gap is arranged between the lower surface film conveying roller group D-2-2 and the upper steel belt C-2-2, and the second gap is smaller than the first gap. In the running process of the equipment, when the prepreg A-1-1 runs to the discharge end of the lower steel strip C-2-3, the prepreg A-1-1 is shoveled from the surface of the lower steel strip C-2-3 by the sharp-angled structure of the lower scraper D-2-1 and then continuously runs in the first gap along the lower surface of the upper steel strip C-2-2 and the upper surface of the lower scraper D-2-1, and the process can avoid the phenomenon that the prepreg A-1-1 is excessively contacted with air to cause excessive gas to permeate into the prepreg A-1-1. For prepreg A-1-1 containing a mixed resin system having a lower viscosity and a slower curing speed, air that has traveled to the lower blade D-2-1 penetrates into prepreg A-1-1 more easily. Non-continuous surface films may be pre-laid on both upper and lower surfaces of the prepreg A-1-1 at the feed end to prevent air from penetrating into the prepreg A-1-1 from both upper and lower surfaces. The width of the plane of the upper part of the lower scraper D-2-1 is not suitable to be too long, so that the running resistance of the prepreg A-1-1 is prevented from being too large, and the prepreg A-1-1 can quickly enter between the lower surface film and the upper steel belt C-2-2 due to the fact that the width of the lower scraper D-2-1 along the running direction of the prepreg A-1-1 is smaller, namely the left-right direction in figure 15, and the prepreg A-1-1 can continuously run in the second gap, so that excessive gas infiltration can be avoided. And under the pressure action between the lower surface film conveying roller group D-2-2 and the upper steel belt C-2-2, the lower surface film is attached to the lower surface of the prepreg A-1-1.

Preferably, the lower surface film carrying roller group D-2-2 may be provided as a driving roller or a driven roller if the linear speed of the driving roller is the same as the running speed of the prepreg A-1-1. In order to facilitate the position adjustment of the sub assembly D-2 adhered with the surface film, the sub assembly D-1 adhered with the surface film and the sub assembly D-2 adhered with the surface film are arranged on a press framework C-3, the upper position, the lower position, the left position and the right position can be adjusted, the film pasting component limiting device D-2-3 is correspondingly arranged on the film pasting component subassembly D-2, the basic structure, the application and the using method of the film pasting component limiting device D-2-3 are the same as those of the steel strip roller C-1 limiting device, the lower scraping plate D-2-1 and the lower surface film conveying roller set D-2-2 are connected onto the film pasting component limiting device D-2-3 through a perforated plate and limiting screws, and the film pasting component limiting device D-2-3 is also connected onto the press framework C-3 through the perforated plate and the limiting screws. The film sticking assembly limiting device D-2-3 adjusts the upper and lower positions of the whole body through limiting screws, and the lower scraper D-2-1 and the limiting screws corresponding to the lower surface film conveying rollers respectively adjust the left and right positions.

As shown in fig. 12-13, a surfacing film subassembly D-3 provided on the rear side of the upper left steel belt roll C-1 for applying a surfacing film, which has been coated with an adhesive resin at this time, to the upper surface of the prepreg a-1-1, the surfacing film subassembly D-3 including an upper blade D-3-1 and a surfacing film feed roll group D-3-2, the surfacing film feed roll group D-3-2 also being a pair of rolls with a spacing equal to or slightly smaller than the thickness of the prepreg a-1-1, the surfacing film feed roll group D-3-2 having a linear velocity equal to the advancing velocity of the prepreg a-1-1 away from the discharge end, the surfacing film subassembly D-3 being operated, the top surface film travels between the top surface film carrying roller group D-3-2, where the top surface film is applied to the top surface of the prepreg A-1-1. The upper scraping plate D-3-1 is positioned above the upper surface film conveying roller group D-3-2, and an upper surface film channel is formed between the upper scraping plate D-3-1 and the upper surface film conveying roller. The shape of the upper scraper D-3-1 is shown in figures 12 and 13, the upper scraper D-3-1 functions similarly to the lower scraper D-2-1, during the operation of the equipment, the sharp-angled structure of the upper scraper D-3-1 shovels down the prepreg A-1-1 attached to the upper steel strip C-2-2, and simultaneously, the prepreg A-1-1 advances along the arc-shaped gap formed between the upper scraper D-3-1 and the lower surface film conveying roller set D-2-2, and after the prepreg A-1 advances to the position between the upper surface film conveying roller set D-3-2, the upper surface film is attached to the surface, as shown in figure 16, the path of the upper surface film attaching process is shown.

In summary, the feeding path of the upper surface film is between the coating resin roll D-1, then between the upper blade D-3-1 and one of the upper surface film conveying rolls, and then between the upper surface film conveying roll group D-3-2; the feeding path of the lower surface film is between a lower scraper D-2-1 and one of the lower surface film conveying rollers, and then between the upper surface film conveying roller group D-3-2 under the supporting and guiding action of the other lower surface film conveying roller, the prepreg A-1-1 on the press body C leaves the upper steel belt C-2-2 and the lower steel belt C-2-3 under the scraping action of the upper scraper D-3-1 and the lower scraper D-2-1, and the moving path of the prepreg A-1 sequentially passes through the two lower surface film conveying rollers and then enters the upper surface film conveying roller group D-3-2.

In order to facilitate the position adjustment of the upper surface film subassembly D-3, the upper surface film subassembly D-3 and the lower surface film subassembly D-2 are connected with the press framework C-3 through the film assembly limiting device D-2-3, and the up-down and left-right positions can be adjusted.

The material discharged from the film-sticking module D is in the form of a prepreg A-1-1 with upper and lower layers of surface films A-1-2 stuck thereon, which is essentially a preliminarily compacted closed prepreg A-1, but the two surface films A-1-2 are still in a mechanically separable state and need to be further reinforced. Therefore, the invention is provided with an outer conveying frame E which transports the closed impregnation body A-1 which is separated from the film sticking assembly D and secondarily heats and cures the joint of the two sides of the two layers of surface films A-1-2 on the closed impregnation body A-1.

The outer transmission frame E comprises an outer transmission frame framework E-2, a transmission roller E-1 and a heating sheet group E-3, wherein the outer transmission frame framework E-2 is a supporting part of the outer transmission frame E, and the transmission roller E-1 and other devices can be installed on the outer transmission frame framework E-2. The transmission roller E-1 comprises a plurality of groups of axially rotatable rollers which are correspondingly arranged up and down, wherein one or more groups of outer transmission rollers E-1 at the left end are driving rollers and are connected with a motor to provide forward pulling force for the closed impregnation body A-1. The interval between the transfer rollers E-1 is equal to or slightly smaller than the thickness of the closed impregnation body a-1, through which the closed impregnation body a-1 travels during the transport and pressing of each pair of transfer rollers E-1. As shown in FIG. 8, the transfer roller E-1 has a slightly larger diameter at both ends in the axial direction than at the center portion, so as to facilitate the compaction of the narrower-edge portions of the closed-type impregnated body A-1.

As shown in FIG. 8, two pairs of heating plate groups E-3 are arranged between each two groups of conveying rollers E-1, the heating plate groups E-3 are arranged at two axial ends of the conveying rollers E-1, and the heating plate groups E-3 are two flat plates with a space, so that a heating gap is formed. In the operation process of the equipment, the part without the central layer at the edge of the closed impregnation body A-1 passes through the heating gap, the bonding resin at the edge is heated and cured, the upper surface film and the lower surface film are attached together to form a closed structure, and meanwhile, the prepreg A-1-1 of the central layer is not acted by the heating sheet and keeps plasticity.

The material discharged from the outer transport frame E was in the form of a closed-type impregnated body A-1 in which the surface film A-1-2 was continuous and the center layer prepreg A-1-1 was discontinuous. And carrying out post-treatment such as cutting and the like to change the material into a state suitable for being laid on the surface of the mould B. The surface film A-1-2 is required to be unbreakable in the laying process, the problem can be solved by temporarily padding cotton cloth at a grabbing point, and the surface film A-1-2 is allowed to be broken in the compression molding process.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. A production method of high-fiber-content glass fiber reinforced plastic is characterized by comprising the following steps:

s1, preparing a high-fiber-content glass fiber reinforced plastic prepreg (A-1-1);

s2, preparing the prepreg (A-1-1) into a closed type prepreg (A-1);

s3, combining a plurality of closed impregnation bodies (A-1) to form a preform (A);

and S4, performing mould pressing and curing molding on the preform (A) through a mould (B), and finally forming the glass fiber reinforced plastic product.

2. The production method of high fiber content glass reinforced plastic according to claim 1, characterized in that the preform (a) is composed of a plurality of closed-type impregnated bodies (a-1) and an interlayer bonding mat (a-2), and the joint positions of two adjacent closed-type impregnated bodies (a-1) are bonded by the interlayer bonding mat (a-2);

the closed impregnation body (A-1) is of a closed sandwich structure and consists of a prepreg (A-1-1) and two layers of surface films (A-1-2), wherein the prepreg (A-1-1) is positioned between the two layers of surface films (A-1-2), the two layers of surface films (A-1-2) are completely attached and wrap the prepreg (A-1-1), and the periphery of the closed impregnation body (A-1) is sealed;

the prepreg (A-1-1) comprises thermosetting mixed resin and reinforcing fibers, wherein the thermosetting mixed resin has initial viscosity, comprises a thermosetting resin body, a curing agent, an accelerator and a flame retardant and is impregnated in the reinforcing fibers, the surface film (A-1-2) comprises semi-cured thermosetting resin and reinforcing fibers, and the semi-cured thermosetting resin has initial strength;

the composition of the interlaminar bonding mat (A-2) is set in the same manner as that of the prepreg (A-1-1) in an uncured state with a certain viscosity;

before the molding, curing and forming stage of the closed impregnation body (A-1), the resin mixture system in the closed impregnation body is not completely cured and still has plasticity.

3. The method for producing high fiber content glass reinforced plastic according to claim 1, wherein in the step S2, the prepreg (a-1-1) is prepared into a closed type prepreg (a-1) using a double steel belt press including a press body (C), a film application assembly (D), and an outer transfer frame (E);

the prepreg (A) is formed by a press body (C) and a prepreg (A) which is arranged on the opposite side of the press body (C), wherein the press body (C) comprises a press framework (C-3), an upper steel belt (C-2-2), a lower steel belt (C-2-3) and a steel belt roller (C-1), the upper steel belt (C-2-2) and the lower steel belt (C-2-3) are arranged in the press framework (C-3) in an up-and-down mode and jointly drive the prepreg (A-1-1) to move from a feeding end to a discharging end, and the upper steel belt (C-2-2) and the lower steel belt (C-2-3) are matched to continuously apply temperature and pressure to the prepreg (A-1-1);

the film sticking component (D) is arranged on the press framework (C-3) and close to the discharge end and is used for sealing the prepreg (A-1-1) between two layers of surface films (A-1-2) to form the closed-type prepreg (A-1);

the outer transmission frame (E) transports the closed impregnation body (A-1) away from the film pasting component (D) and secondarily heats and cures the two sides of the connection part of the two layers of surface films (A-1-2) on the closed impregnation body (A-1).

4. The production method of high fiber content glass reinforced plastic according to claim 3, wherein two rows of steel belt rollers (C-1) are arranged on the press frame (C-3) in an upper and lower manner, and the steel belt rollers (C-1) can be adjusted in the upper and lower positions and the left and right positions relative to the press frame (C-3);

the steel belt rollers (C-1) at the upper row are divided into an upper left steel belt roller and an upper right steel belt roller which are used for driving the upper steel belt (C-2-2) to circularly run together;

the steel belt rollers (C-1) at the lower row are divided into a lower left steel belt roller and a lower right steel belt roller which are used for driving the lower steel belt (C-2-3) to circularly run together; at least one of the steel belt rollers (C-1) in each row is a driving roller, and the linear speeds of the driving rollers are the same.

5. The production method of high fiber content glass fiber reinforced plastic according to claim 3, wherein the press body (C) further comprises a press plate (C-4), a press plate press (C-4-1) and a press plate press roll (C-4-2), wherein the press plate (C-4) is arranged into a plurality of press plate (C-4) groups which are correspondingly arranged up and down, at least one press plate (C-4) in each press plate (C-4) group is connected with the press plate press (C-4-1), and the press plate press (C-4-1) is assembled on the press frame (C-3);

the surface of each pressing plate (C-4) is provided with a pressing plate pressing roller (C-4-2), the surface of each pressing plate pressing roller (C-4-2) and the surface of each pressing plate (C-4) are provided with a height difference, and the pressing plates (C-4) and the pressing plate pressing rollers (C-4-2) are in contact with the inner surface of the upper steel strip (C-2-2) or the lower steel strip (C-2-3) together to apply pressure.

6. The method for producing high fiber content glass reinforced plastic according to claim 3, wherein the film-coating assembly (D) comprises a resin-coating roller (D-1), a resin-coating tank (D-1-1), a lower surface film sub-assembly (D-2), an upper surface film sub-assembly (D-3);

the resin coating roller (D-1) is arranged as an axially rotatable roller with a space formed in the middle, the space is used for the upper surface film to pass through, and the resin coating tank (D-1-1) is provided with a resin discharge hole used for contacting with the upper surface film;

the upper surface film sub-assembly (D-3) is arranged at the rear side of the upper left steel belt roller and is used for attaching the upper surface film to the upper surface of the prepreg (A-1-1), the upper surface film sub-assembly (D-3) comprises an upper scraper blade (D-3-1) and an upper surface film conveying roller set (D-3-2), the upper scraper blade (D-3-1) is formed with a sharp-angled structure, the sharp-angled structure can be contacted with the surface of the upper steel belt (C-2-2) and is used for scraping the prepreg (A-1-1) from the upper steel belt (C-2-2), the interval between the upper surface film conveying roller sets (D-3-2) is equal to or smaller than the thickness of the prepreg (A-1-1), and the upper scraper blade (D-3-1) is positioned at the upper surface film conveying roller set (D-3-2) An upper surface film channel is formed between the upper scraper (D-3-1) and the upper surface film conveying roller;

the lower surface film attaching subassembly (D-2) is arranged on the rear side of the lower left steel strip roller and comprises a lower scraper blade (D-2-1) and a lower surface film conveying roller group (D-2-2), wherein the lower scraper blade (D-2-1) is provided with a sharp-angled structure which can be in contact with the surface of the lower steel strip (C-2-3) and is used for scraping the prepreg (A-1-1) from the lower steel strip (C-2-3), the lower surface film conveying roller group (D-2-2) is used for attaching the lower surface film to the lower surface of the prepreg (A-1-1) and comprises two lower surface film conveying rollers which are horizontally and adjacently arranged, and a lower surface film channel is formed between the lower surface film conveying roller group (D-2-2) and the lower scraper blade (D-2-1).

7. The method for producing high fiber content glass reinforced plastic according to claim 6, wherein the upper portion of the lower blade (D-2-1) is disposed in a plane, and a first gap slightly larger than the thickness of the prepreg (A-1-1) is provided between the plane and the surface of the upper steel belt (C-2-2), and a second gap smaller than the first gap is provided between the lower surface film transfer roller set (D-2-2) and the upper steel belt (C-2-2).

8. The production method of high-fiber-content glass fiber reinforced plastic according to claim 3, wherein a left frame base (C-3-1) and a right frame base (C-3-2) are respectively arranged at two ends of the bottom of the press frame (C-3) along the length direction of the press frame, and the height of the left frame base (C-3-1) is higher than that of the right frame base (C-3-2).

9. The method for producing high fiber content glass reinforced plastic according to claim 8, wherein the upper steel strip (C-2-2) and the lower steel strip (C-2-3) are both in a straight shape in cross section, and the two sides of the lower steel strip (C-2-3) in the running direction are respectively provided with an anti-overflow inclined plate (C-2-4);

a drawer-shaped cooling groove (C-5) is detachably mounted on the pressing plate (C-4) close to the film sticking assembly (D), and the cooling groove (C-5) is positioned outside the press framework (C-3). .

10. The production method of high-fiber-content glass fiber reinforced plastic according to claim 3, wherein the outer conveying frame (E) comprises an outer conveying frame framework (E-2), conveying rollers (E-1) and a heating plate group (E-3), the conveying rollers (E-1) comprise a plurality of groups of axially rotatable rollers which are correspondingly arranged up and down, and the distance between the conveying rollers (E-1) is equal to or slightly smaller than the thickness of the closed impregnation body (A-1);

the heating plate group (E-3) is arranged at two ends of the conveying roller (E-1) in the axial direction, and a heating gap is formed on the heating plate group (E-3).