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CN111892810A - Polyamide vacuum bag composite film for wind power blade and production process thereof - Google Patents

Polyamide vacuum bag composite film for wind power blade and production process thereof Download PDF

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Publication number
CN111892810A
CN111892810A CN202010777679.0A CN202010777679A CN111892810A CN 111892810 A CN111892810 A CN 111892810A CN 202010777679 A CN202010777679 A CN 202010777679A CN 111892810 A CN111892810 A CN 111892810A
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China
Prior art keywords
layer
wind power
film
vacuum bag
temperature
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Withdrawn
Application number
CN202010777679.0A
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Chinese (zh)
Inventor
唐子成
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Guocheng Shunfeng Wind Power Generation Co ltd
Original Assignee
Anhui Guocheng Shunfeng Wind Power Generation Co ltd
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Priority to CN202010777679.0A priority Critical patent/CN111892810A/en
Publication of CN111892810A publication Critical patent/CN111892810A/en
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
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    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/24—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer not being coherent before laminating, e.g. made up from granular material sprinkled onto a substrate
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2255/26—Polymeric coating
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    • B32—LAYERED PRODUCTS
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    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
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    • B32B2307/746—Slipping, anti-blocking, low friction
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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    • C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2427/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
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Abstract

The invention belongs to the field of high polymer materials, and particularly relates to a polyamide vacuum bag composite film for wind power blades and a production process thereof, wherein the production process is simple, the raw material source is wide, the composite film has good mechanical property, high strength and flexibility, the vacuum bag film has the advantages of high strength, high elongation rate, direct contact with wind power blade adhesive resin and the like, and a packaging bag film material is stable in size, does not deform or delaminate, and has good extensibility, thermal stability, barrier property, high tensile strength, tearing resistance, flexibility and good shape following property; the blade material can directly contact resin, is less in pollution and high in forming rate, particularly thick wind power blades can improve the one-step forming yield, products are free of bubbles, the strength of the products is high, repeatability is high, meanwhile, the production cost is greatly reduced, adhesives are not used, fluorine-containing resin and films are not used, the stability and the integrity of the product quality of the blade material are guaranteed, and the blade material has wide application value, is economical and practical and has high cost performance.

Description

Polyamide vacuum bag composite film for wind power blade and production process thereof
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a polyamide vacuum bag composite membrane for a wind power blade and a production process thereof.
Background
The traditional blade production generally adopts a die sinking process, and a large amount of volatile toxic gases such as styrene and the like are generated in the production process, so that harm is brought to operators and the environment. On the other hand, with the increase of the size of the blade, in order to ensure the stable operation of the generator and the safety of the tower, the weight of the blade is required to be light and the mass distribution is required to be uniform, so that the development of the blade production process from opening to closing is promoted. By adopting a mold closing process, such as a vacuum infusion molding process commonly used at present, the volatilization of styrene in the molding process can be greatly reduced, and the resin content can be more easily and accurately controlled, so that the uniformity of the mass distribution of the composite material blade can be ensured, and the quality stability of the blade can be improved. The blade of wind driven generator is manufactured through vacuum pouring and forming process. The vacuum infusion molding process is to lay fiber reinforced material directly on a mold, lay a stripping layer on the fiber reinforced material, the stripping layer is usually a very thin fiber fabric with low porosity and low permeability, lay high permeability medium on the stripping layer, and then cover and seal with a vacuum film. The mould is covered and sealed by a film, and the vacuum pump exhausts air to a negative pressure state. The demolding cloth is a layer of fiber fabric easy to peel and low in porosity, the flow guide cloth is a medium with high permeability, and the flow guide pipes are distributed on the flow guide cloth. The resin enters the whole system through the rubber inlet pipe, the main flowing direction of the resin is guided through the guide pipe, the resin is distributed to each corner of the layer through the guide cloth, and the demolding cloth is peeled off after curing, so that the layer-spread wind power blade structure with high compactness and low gel content is obtained. The existing polyamide vacuum bag film for the wind power blade is required to have good strength, toughness, heat resistance and higher physical and mechanical strength, otherwise, the use of vacuum infusion cannot be met, for example, CN2016104396308 discloses a composite vacuum bag film, which is prepared by bonding an inner layer film and an outer layer through an adhesive, wherein the inner layer comprises a polyfluorinated ethylene film, an ultra-high molecular weight polyethylene film, an aluminized CPP film and a surface fluorination-treated PP film, the interfacial force between the inner layer film and the outer layer film is small, and coextrusion is difficult, the bonding force of the adhesive is small, but the bonding force of the polyfluorinated ethylene film, the ultra-high molecular weight polyethylene film and the like used in the bonding process is small, the composite film is difficult to form and has poor heat resistance, and the inner layer film including an aluminum foil film is caused by a plurality of inherent defects such as poor toughness, brittle property, easy fracture, poor adhesive bonding property and the like, the polyamide vacuum bag film for the wind power blade used in the current market can not well meet the current use requirements, the polyamide vacuum bag film for the wind power blade can not well meet the current use requirements, the technical personnel in the field need to develop a production process of the polyamide vacuum bag composite film for the wind power blade urgently, and the low surface performance of films such as PTFE is utilized to prevent the adhesion in the blade forming process, but the good compounding of the films can not be realized by the adhesion of adhesives when preparing the composite film, the coextrusion performance of the used outer layer film and nylon is poor, and the requirements of the heat resistance and the toughness of the vacuum bag film can not be met, the vacuum bag also needs to have higher elongation rate to adapt to the change in the vacuum compression process, the aluminum plating, the current PA and the like of PTFE can not meet the use requirements, the bag breaking and the poor processing can not be easily caused, meeting the existing performance requirements and market demands.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a production process of a polyamide vacuum bag composite film for a wind power blade.
The invention is realized by the following technical scheme:
a polyamide vacuum bag composite membrane for a wind power blade comprises a surface layer, a middle layer and a base material layer which are sequentially arranged from outside to inside, wherein the upper surface of the middle layer is combined with the lower surface of the surface layer in a surface coating manner, the lower surface of the middle layer is attached to the upper surface of the base material layer, the surface layer is a heat-resistant separation coating layer coated on the upper surface of the middle layer in a spraying manner, the middle layer is a multi-layer co-extrusion membrane, the base material layer is a PA membrane, the multi-layer co-extrusion membrane is a double-layer co-extrusion membrane, and the double-layer co-extrusion membrane comprises a polyester elastomer layer and a;
the production process of the polyamide vacuum bag composite membrane for the wind power blade comprises the following steps:
(1) preparing the following components in parts by weight: 78-84 parts of PA elastomer, 37-42 parts of PET, 5-7 parts of halloysite powder, 5-8 parts of pyrophyllite powder, 4.6-5.9 parts of dispersant, 1.6-1.8 parts of antioxidant and 1.9-2.1 parts of opening agent;
(2) carrying out hot air drying on the PA elastomer, the PET, the halloysite powder and the pyrophyllite powder;
(3) mixing halloysite powder, pyrophyllite powder and a dispersing agent at a high speed in a high-speed mixer to obtain halloysite powder and pyrophyllite powder treated by the dispersing agent;
(4) putting the PA elastomer, the PET, the antioxidant, the opening agent and the halloysite powder and pyrophyllite powder treated by the dispersant obtained in the step (3) into a high-speed mixer for mixing to obtain a mixture;
(5) extruding and granulating the mixture obtained in the step (4) in a double-screw extruder to obtain PA elastomer/polyester elastomer alloy material granules;
(6) drying the PA elastomer/PET alloy granules and the polyester elastomer at 115-120 ℃ for 6-7 h, wherein the co-extrusion film forming temperature is 240-258 ℃, respectively extruding from respective extruder heads after melting, carrying out co-extrusion, then carrying out traction by a traction roller set, and finally carrying out rolling to obtain a double-layer co-extrusion film, namely an intermediate layer;
(7) taking the PA film as a substrate layer, and compounding the double-layer co-extruded film obtained in the step (6) on the surface of the substrate layer in a wax-coated hot-melt compounding mode to form an intermediate layer;
(8) compounding a PVDC heat-resistant barrier coating film on the upper surface of the middle layer in a spray surface coating mode to form a surface layer, wherein the spray condition is as follows: the electrostatic voltage is 65-70 kv, and the PVDC slurry feeding amount is 0.8-1.0 kg/m2(ii) a And (3) placing the sprayed sample plate in a drying oven at 150-160 ℃ for baking for 16-22 min, taking out and cooling to room temperature to obtain the polyamide vacuum bag composite membrane for the wind power blade.
Further, the temperature of hot air drying in the step (2) is 70-80 ℃, the drying time is 6-7 hours, the mixing temperature of the high-speed mixer in the step (3) is 60-65 ℃, the rotating speed is 2000-2500 rpm, the mixing time is 10-15 min, the rotating speed of the high-speed mixer in the step (4) is 600-1500 rpm, and the mixing time is 10-15 min.
Further, the twin-screw extruder described in step (5) comprises six zones, wherein the temperature and the screw rotation speed of each zone are respectively as follows: the temperature of the first area is 195-205 ℃, the temperature of the second area is 205-215 ℃, the temperature of the third area is 215-230 ℃, the temperature of the fourth area is 230-235 ℃, the temperature of the fifth area is 240-250 ℃, the temperature of the sixth area is 245-250 ℃, and the temperature of the machine head is 240-250 ℃; the rotating speed of the screw is 150-200 r/min, and the average grain diameter of the halloysite powder and the pyrophyllite powder is 0.03-0.04 mu m.
Further, the dispersing agent is one of ethylene bis stearamide and N-ethyl o-toluenesulfonamide.
Further, the antioxidant is a mixture of diphenyl-octyl phosphite and styrenated phenol in a weight ratio of 1: 1.
Further, the opening agent is selected from one or more of silica aerogel, AMS resin or zinc stearate.
The wax is uniformly coated on a substrate, and then the film is immediately laminated and cooled to obtain a composite film product, wherein the composite mode is called hot melt composite, does not use adhesive and is only used in polyolefin film composite in the past.
Further, the hot melting compounding in the step (7) is specifically that the wax is heated to a molten state at a speed of 80-90 m/min and a coating amount of 0.3-0.5 g/m2, compounded and cooled to room temperature, wherein the coating tension is 9-10 kg, the winding tension is 15-16 kg, the coating pressure is 0.25-0.27 kg, and the compounding pressure is 0.4-0.5 kg.
Further, the wax used in the step (7) is polyamide wax.
The chemical structure of the polyester elastomer is simply shown as follows:
Figure 621441DEST_PATH_IMAGE002
the invention has the beneficial effects that:
the invention realizes the co-extrusion through a double-layer co-extrusion film comprising a polyester elastomer layer and a PET/PA elastomer blending layer which are sequentially attached from outside to inside, wherein the PA elastomer and the PET are blended, the defects of the PA elastomer in the aspects of forming processing property, strength and heat resistance can be mutually supplemented and improved in performance, and the defect of poor toughness of the PET can be overcome, the blending of the PET and the PA elastomer mainly plays a role in ensuring good bonding strength with a substrate while the middle layer taking the PA elastomer as a main body has good film forming property and processing property, and equivalently that the middle layer and the substrate both contain PA components, so that the middle layer and the substrate can realize hot melt compounding to form a precondition that the middle layer can have better bonding strength between different two layers of materials without using an adhesive, and the two components of the co-extrusion middle layer are also due to the existence of the PET, the high-strength PVC film has better bonding strength with the polyester elastomer, and further realizes better bonding strength and balanced comprehensive performance of the whole vacuum bag film, the PET elastomer and the PA elastomer respectively play multiple roles in the film, are mutually promoted and supplement each other, the PVDC can be coated on the surface of the polyester elastomer film layer, and the high-corrosion-resistant PVC film has good corrosion resistance, the polycarbonate polyurethane polyester interpenetrating polymer network structure adhesive is adopted, the molecular weight is high, the viscosity is high, the fluidity is low, the strength of the composite film is ensured without using the adhesive in the composite process, the spreading effect is good, the use problems of additives such as an opening agent and the like are not influenced, the problems of poor peeling strength, poor heat sealing, increased friction coefficient and the like can not occur, in addition, the spray coating mode is adopted to realize the quick positioning coating of the PVDC, the barrier property of the film can be remarkably improved, and the high-humidity resistance PVC film has good, The invention compounds a plurality of component films to form a composite film by means of coextrusion, hot melt compounding and the like, can exert the respective advantages of the components, mutually make up the deficiencies, not only utilizes the high gas barrier property of PVDC and the heat sealability of PET, but also utilizes the good toughness and the strength of PA elastomer and polyester elastomer and the good gas barrier property of nylon, utilizes the strength and the printability of each layer of PET, and the sequencing modes of the films are mutually dependent, thereby promoting the good forming of the composite film, and the composite film has the premise of better comprehensive performance compared with a single film, the consistency of the set performance of the wind power blade can be met, the combination of elasticity, flexibility, barrier property and strength of the wind power blade and high bursting pressure endow the vacuum bag with use reliability, the use is stable, the rupture risk is reduced, the PA elastomer has an amide structure and a polyether structure and has good compatibility with PET, the PA elastomer and the PET form a multiphase composite system with alloy prepared from the PA elastomer, the toughness is obviously improved, the good compatibility of the polyester elastomer and the PET and the polyether structure are adopted, the polyester elastomer and the PET are co-extruded, the good co-extrusion strength of the polyester elastomer layer and the PA elastomer/PET can be realized, the middle layer with good co-extrusion effect is formed, the PVDC and the polyester elastomer layer have good coating strength, the surface coating of the PVDC on the PA component layer is realized, the BOPA of the substrate layer also has good bonding strength with the middle layer through the PA elastomer component contained in the middle layer, the polyamide wax is used as an anti-settling agent of the water-based coating in the prior use, the hot-melt compounding mode is adopted, no adhesive is used, the cost is not increased, the hot-melt compounding strength is high, and the layering condition can not occur at high temperature.
Compared with the prior art, the invention has the following advantages:
the production process disclosed by the invention is simple, the raw material source is wide, the vacuum bag film has good mechanical properties, high strength, high soft elongation, good heat resistance and smooth two sides of the product, can be used when being applied to wind power blade adhesives such as polyester, epoxy and phenolic resin, has less pollution and high forming rate, particularly, the thick wind power blade can improve the one-step forming yield, the product has no bubbles, the product has high strength and strong repeatability, the product is made into a structural member, the thickness of the product is very uniform, the production cost is greatly reduced, no adhesive is used, no fluorine-containing resin and film are used, the stability and the integrity of the product quality of the blade material are ensured, and the vacuum bag film has wide application value.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
The PA elastomer is selected from Japanese Dicel diamine 47MS3, the PVDC slurry is a uniform dispersion liquid of SolvayIXANPNE 613 with the mass fraction of 10% uniformly dispersed in a mixed solvent of tetrahydrofuran and toluene with the mass fraction of 1:1, and the polyester elastomer is Dupont Hytrel 6356. Polyamide wax was purchased from NEW-0401 from nanjing sky poem wax powder, PA film was a 25 μ M bopa film, from double star painted sculpture, PET was an instrumented film grade polyester chip F601, halloysite powder was purchased from jungian anecdotal mineral, pyrophyllite powder was purchased from ningbo jia corporation, AMS resin was purchased from M-80 of wuxishikejinshiji chemist.
The first step, according to the following components and weightPreparing materials in parts by weight: 78 parts of PA elastomer, 37 parts of PET, 5 parts of halloysite powder, 5 parts of pyrophyllite powder, 4.6 parts of ethylene bis stearamide dispersant, 1.6 parts of antioxidant and 1.9 parts of AMS resin opening agent; secondly, carrying out hot air drying on the PA elastomer, the PET, the halloysite powder and the pyrophyllite powder at the temperature of 70 ℃ for 6 hours; thirdly, mixing the halloysite powder, the pyrophyllite powder and the dispersing agent at high speed in a high-speed mixer to obtain the halloysite powder and the pyrophyllite powder treated by the ethylene bis stearamide dispersing agent, wherein the mixing temperature of the high-speed mixer is 60 ℃, the rotating speed is 2000rpm, and the mixing time is 10 min; fourthly, putting the PA elastomer, the PET, the antioxidant, the AMS resin opening agent and the halloysite powder and pyrophyllite powder treated by the dispersant obtained in the third step into a high-speed mixer for mixing to obtain a mixture, wherein the rotating speed of the high-speed mixer is 600rpm, and the mixing time is 10 min; fifthly, extruding and granulating the mixture obtained in the fourth step in a double-screw extruder to obtain PA elastomer/polyester elastomer alloy material granules; sixthly, drying the PA elastomer/PET alloy granules and the polyester elastomer at 115 ℃ for 6h, wherein the co-extrusion film forming temperature is 240 ℃, the PA elastomer/PET alloy granules and the polyester elastomer are respectively melted and then extruded out from respective extruder heads, and then are co-extruded, drawn by a drawing roller group, and finally are wound to obtain a double-layer co-extruded film, namely the thickness of the middle layer is 50 microns; seventhly, taking the BOPA film as a substrate layer, and compositing the double-layer co-extruded film obtained in the sixth step on the surface of the substrate layer in a wax-coated hot-melt composite mode to form an intermediate layer; eighthly, compounding a PVDC heat-resistant separation coating film on the upper surface of the middle layer in a surface coating spraying mode to form a surface layer, wherein the spraying conditions are as follows: the electrostatic voltage is 65kv, and the PVDC slurry feeding amount is 0.8kg/cm2(ii) a Placing the sprayed sample plate in a 150 ℃ oven to bake for 16min, taking out and cooling to room temperature to obtain the polyamide vacuum bag composite membrane for the wind power blade, wherein the polyamide vacuum bag composite membrane for the wind power blade comprises a surface layer, a middle layer and a substrate layer which are sequentially arranged from outside to inside, the upper surface of the middle layer is combined with the lower surface coating of the surface layer, the lower surface of the middle layer is attached to the upper surface of the substrate layer, the surface layer is a heat-resistant separation coating layer of which the upper surface coating of the middle layer is a multi-layer co-extrusion membrane, the substrate layer is a PA membrane, and the multi-layer co-extrusion membrane is a double-layer coLayer coextrusion membrane, bilayer coextrusion membrane include outside-in polyester elastomer layer and PET/PA elastomer blend layer crowded altogether in proper order, the fifth step twin-screw extruder contain six districts, wherein each district temperature and screw rod rotational speed are respectively: the temperature of the first area is 195 ℃, the temperature of the second area is 205 ℃, the temperature of the third area is 215 ℃, the temperature of the fourth area is 230 ℃, the temperature of the fifth area is 240 ℃, the temperature of the sixth area is 245 ℃ and the temperature of the machine head is 240 ℃; the rotating speed of the screw is 150r/min, the antioxidant is a mixture of diphenyl-octyl phosphite ester and styrenated phenol according to the weight ratio of 1:1, and the seventh step of hot melt compounding specifically comprises 9kg of coating tension, 15kg of winding tension, 0.25kg of coating pressure, 0.4kg of compounding pressure, 80m/min of machine speed and 0.3g/m of coating weight2Heating the polyamide wax to a molten state, compounding, and cooling to room temperature to obtain the polyamide wax.
Example 2
The PA elastomer is selected from vestamid E40L of Dehurs company, and the PVDC slurry is uniform dispersion liquid polyester elastomer which is formed by uniformly dispersing SolvayXAN PNE 288 with the mass fraction of 10% into a mixed solvent of tetrahydrofuran and toluene in a ratio of 1:1, and is Dupont Hytrel 6345. Polyamide wax was purchased from NEW-0401 (melting point 140-145 ℃) from Nanjing Tianshi wax powder, Inc., PA film was 25 μm BOPA film, from Shuangxing colored plastic, PET was an instrumented film grade polyester chip F602, halloysite powder was purchased from Jun-rank mineral products of memorial birthday, pyrophyllite powder was purchased from Ningbo Jia and Inc., and silica aerogel was purchased from Ok-412 chemical engineering of Shouguang Bangze.
Firstly, preparing the following components in parts by weight: 84 parts of PA elastomer, 42 parts of PET, 7 parts of halloysite powder, 8 parts of pyrophyllite powder, 5.9 parts of N-ethyl o-toluenesulfonamide dispersant, 1.8 parts of antioxidant and 2.1 parts of silicon dioxide aerogel opening agent; secondly, carrying out hot air drying on the PA elastomer, the PET, the halloysite powder and the pyrophyllite powder at the temperature of 80 ℃ for 7 hours; thirdly, mixing the halloysite powder, the pyrophyllite powder and the dispersing agent at a high speed in a high-speed mixer to obtain the halloysite powder and the pyrophyllite powder treated by the N-ethyl o-toluenesulfonamide dispersing agent, wherein the mixing temperature of the high-speed mixer is 65 ℃, the rotating speed is 2500rpm, and the mixing time is 15 min; fourthly, opening the PA elastomer, the PET, the antioxidant and the silicon dioxide aerogelMixing the mouth agent and the halloysite powder and pyrophyllite powder treated by the dispersant obtained in the third step in a high-speed mixer to obtain a mixture, wherein the rotating speed of the high-speed mixer is 1500rpm, and the mixing time is 15 min; fifthly, extruding and granulating the mixture obtained in the fourth step in a double-screw extruder to obtain PA elastomer/polyester elastomer alloy material granules; sixthly, drying the PA elastomer/PET alloy granules and the polyester elastomer at 120 ℃ for 7h, wherein the co-extrusion film forming temperature is 258 ℃, respectively extruding the granules from respective extruder heads after melting, carrying out co-extrusion, then carrying out traction by a traction roller set, and finally carrying out rolling to obtain a double-layer co-extrusion film, namely an intermediate layer, with the thickness of 50 mu m; seventhly, taking the BOPA film as a substrate layer, and compositing the double-layer co-extruded film obtained in the sixth step on the surface of the substrate layer in a wax-coated hot-melt composite mode to form an intermediate layer; eighthly, compounding a PVDC heat-resistant separation coating film on the upper surface of the middle layer in a surface coating spraying mode to form a surface layer, wherein the spraying conditions are as follows: the electrostatic voltage is 70kv, and the PVDC slurry feeding amount is 1.0kg/cm2(ii) a Placing the template after spraying in a 160 ℃ oven and baking for 22min, taking out and cooling to room temperature, namely preparing the polyamide vacuum bag composite membrane for the wind power blade, wherein the polyamide vacuum bag composite membrane for the wind power blade, including the top layer, intermediate level and the bottom material layer that outside-in set gradually, the upper surface in intermediate level combines with the lower surface coating on top layer, the lower surface in intermediate level and the upper surface laminating on bottom material layer, the top layer is heat-resisting separation coat that has of intermediate level upper surface spraying surface coating, the intermediate level is the multilayer coextrusion membrane, the bottom material layer is the PA membrane, the multilayer coextrusion membrane is the double-deck coextrusion membrane, the double-deck coextrusion membrane includes polyester elastomer layer and PET/PA elastomer blend layer that outside-in crowded altogether in proper order, the fifth step the double screw extruder contain six districts, wherein each district temperature and screw rod rotational speed do not: the temperature of a first area is 205 ℃, the temperature of a second area is 215 ℃, the temperature of a third area is 230 ℃, the temperature of a fourth area is 2235 ℃, the temperature of a fifth area is 250 ℃, the temperature of a sixth area is 250 ℃ and the temperature of a machine head is 250 ℃; the rotating speed of the screw is 200r/min, the antioxidant is a mixture of diphenyl-octyl phosphite ester and styrenated phenol according to the weight ratio of 1:1, and the seventh step of hot melt compounding specifically comprises 10kg of coating tension, 16kg of winding tension, 0.27kg of coating pressure and 0.5kg of compounding pressure, and the machine speed is 90m/min, coating weight 0.5g/m2Heating the polyamide wax to a molten state, compounding, and cooling to room temperature to obtain the polyamide wax.
Comparative example 1
In this comparative example 1, compared with example 1, in the eighth step, a PVDC heat-resistant barrier coating film is not combined on the upper surface of the intermediate layer by spray top coating to form a surface layer, except that the other steps are the same.
Comparative example 2
In this comparative example 2, compared to example 2, the PA elastomer/PET alloy pellets in the sixth step did not contain PET, except that the process steps were the same.
Comparative example 3
This comparative example 3 compares with example 2, in the sixth step, no polyester elastomer is contained, i.e. the intermediate layer is a monolayer film of PA elastomer/PET alloy, except that the other steps are the same.
Control group 1
The control was a pure polyester elastomer.
Control group 2
The control was pure PA elastomer.
The results of the permeability performance test of the polyamide vacuum bag composite films for wind power blades of examples 1 to 2 and comparative examples 1 to 3 and the control group are shown in table 1:
table 1 results of permeability test of polyamide vacuum bag composite films for wind power blades of examples 1 to 2, comparative examples 1 to 3, and control group
Figure 69740DEST_PATH_IMAGE004
The physical property test results of the polyamide vacuum bag composite films for the wind power blades of the examples 1-2, the comparative examples 1-3 and the control group are shown in table 2:
table 2 test results of physical properties of polyamide vacuum bag composite films for wind power blades of examples 1-2 and comparative examples 1-3 and a control group
Figure 773778DEST_PATH_IMAGE006
Note: the wind power blade is detected by a polyamide vacuum bag film standard with reference to T/ZZB 0929-2019.
In summary, it can be seen that the polyamide vacuum bag composite film for the wind power blade prepared by the application has good mechanical properties, high strength and softness, the composite film has good mechanical properties, high strength and softness, the vacuum bag film has the advantages of high strength, high elongation, direct contact with resin and the like, the packaging bag film has stable size, no deformation, no delamination, good extensibility, thermal stability, barrier property, high tensile strength, tear resistance, softness and excellent shape following property, is different from the traditional preparation method of the vacuum bag film, does not use an adhesive or a fluorine-containing film or a raw material, can directly contact with the adhesive resin of the wind power blade, has less pollution and high forming rate, particularly a thick wind power blade, can improve the one-step forming yield, has no bubbles in a product, has high strength and strong repeatability, greatly reduces the production cost, and does not use an adhesive, the method does not use fluorine-containing resin and a film, ensures the stability and the integrity of the quality of the blade material product, and has wide application value, economy, practicability and high cost performance.

Claims (8)

1. The polyamide vacuum bag composite membrane for the wind power blade is characterized by comprising a surface layer, a middle layer and a base material layer which are sequentially arranged from outside to inside, wherein the upper surface of the middle layer is combined with the lower surface of the surface layer in a coating manner, the lower surface of the middle layer is compounded with the upper surface of the base material layer in a non-adhesive hot melting manner, the surface layer is a heat-resistant separation coating layer coated on the upper surface of the middle layer in a spraying manner, the middle layer is a multi-layer co-extrusion membrane, the base material layer is a PA membrane, the multi-layer co-extrusion membrane is a double-layer co-extrusion membrane, and the double-layer co-extrusion membrane comprises a polyester elastomer layer and a PET/PA;
the production process of the polyamide vacuum bag composite membrane for the wind power blade comprises the following steps:
(1) preparing the following components in parts by weight: 78-84 parts of PA elastomer, 37-42 parts of PET, 5-7 parts of halloysite powder, 5-8 parts of pyrophyllite powder, 4.6-5.9 parts of dispersant, 1.6-1.8 parts of antioxidant and 1.9-2.1 parts of opening agent;
(2) carrying out hot air drying on the PA elastomer, the PET, the halloysite powder and the pyrophyllite powder;
(3) mixing halloysite powder, pyrophyllite powder and a dispersing agent at a high speed in a high-speed mixer to obtain halloysite powder and pyrophyllite powder treated by the dispersing agent;
(4) putting the PA elastomer, the PET, the antioxidant, the opening agent and the halloysite powder and pyrophyllite powder treated by the dispersant obtained in the step (3) into a high-speed mixer for mixing to obtain a mixture;
(5) extruding and granulating the mixture obtained in the step (4) in a double-screw extruder to obtain PA elastomer/polyester elastomer alloy material granules;
(6) drying the PA elastomer/PET alloy granules and the polyester elastomer at 115-120 ℃ for 6-7 h, wherein the co-extrusion film forming temperature is 240-258 ℃, respectively extruding from respective extruder heads after melting, co-extruding, drawing by a drawing roller set, and finally rolling to obtain a double-layer co-extruded film, namely an intermediate layer;
(7) taking the PA film as a substrate layer, and compounding the double-layer co-extruded film obtained in the step (6) on the surface of the substrate layer in a wax-coated hot-melt compounding mode to form an intermediate layer;
(8) compounding a PVDC heat-resistant barrier coating film on the upper surface of the middle layer in a spray surface coating mode to form a surface layer, wherein the spray condition is as follows: the electrostatic voltage is 65-70 kv, and the PVDC slurry feeding amount is 0.8-1.0 kg/cm2(ii) a And (3) placing the sprayed sample plate in a drying oven at 150-160 ℃ for baking for 16-22 min, taking out and cooling to room temperature to obtain the polyamide vacuum bag composite membrane for the wind power blade.
2. The polyamide vacuum bag composite film for the wind power blade as claimed in claim 1, wherein the hot air drying temperature in step (2) is 70-80 ℃, the drying time is 6-7 hours, the mixing temperature of the high-speed mixer in step (3) is 60-65 ℃, the rotating speed is 2000-2500 rpm, the mixing time is 10-15 min, the rotating speed of the high-speed mixer in step (4) is 600-1500 rpm, and the mixing time is 10-15 min.
3. The polyamide vacuum bag composite film for wind power blades as claimed in claim 1, wherein the twin-screw extruder in step (5) comprises six zones, wherein the temperature and the screw rotation speed of each zone are respectively: the temperature of the first area is 195-205 ℃, the temperature of the second area is 205-215 ℃, the temperature of the third area is 215-230 ℃, the temperature of the fourth area is 230-235 ℃, the temperature of the fifth area is 240-250 ℃, the temperature of the sixth area is 245-250 ℃, and the temperature of the machine head is 240-250 ℃; the rotating speed of the screw is 150 to 200 r/min.
4. The polyamide vacuum bag composite film for the wind power blade as claimed in claim 1, wherein the dispersant of step (1) is one of ethylene bis stearamide and N-ethyl o-toluenesulfonamide.
5. The polyamide vacuum bag composite film for the wind power blade as claimed in claim 1, wherein the antioxidant in step (1) is a mixture of diphenyl-octyl phosphite and styrenated phenol in a weight ratio of 1: 1.
6. The polyamide vacuum bag composite film for the wind power blade as claimed in claim 1, wherein the opening agent in step (1) is one or more selected from silica aerogel, AMS resin or zinc stearate.
7. The polyamide vacuum bag composite film for wind power blades according to claim 1,
the hot melting compounding in the step (7) is specifically that the coating tension is 9-10 kg, the rolling tension is 15-16 kg, the coating pressure is 0.25-0.27 kg, the compounding pressure is 0.4-0.5 kg, the machine speed is 80-90 m/min, and the coating weight is 0.3-0.5 g/m2Heating the wax to a molten state, compounding, and cooling to room temperature to obtain the product.
8. The polyamide vacuum bag composite film for the wind power blade as claimed in claim 1, wherein the wax used in step (7) is polyamide wax.
CN202010777679.0A 2020-08-05 2020-08-05 Polyamide vacuum bag composite film for wind power blade and production process thereof Withdrawn CN111892810A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022241900A1 (en) * 2021-05-19 2022-11-24 佛山金万达科技股份有限公司 Film formed of waste thermoplastic elastomer and laminate thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022241900A1 (en) * 2021-05-19 2022-11-24 佛山金万达科技股份有限公司 Film formed of waste thermoplastic elastomer and laminate thereof

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