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CN113895124A - Permeation-resistant fluoroplastic product, preparation method and permeation-resistant anticorrosive container equipment - Google Patents

Permeation-resistant fluoroplastic product, preparation method and permeation-resistant anticorrosive container equipment Download PDF

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Publication number
CN113895124A
CN113895124A CN202111257465.1A CN202111257465A CN113895124A CN 113895124 A CN113895124 A CN 113895124A CN 202111257465 A CN202111257465 A CN 202111257465A CN 113895124 A CN113895124 A CN 113895124A
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polytetrafluoroethylene
layer
fluoroplastic
permeation
polytetrafluoroethylene film
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CN113895124B (en
Inventor
陈招
梁俊辉
陈国龙
蔡勇
赵炜
赵君
牛小会
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/30—Shaping by lay-up, i.e. applying fibres, tape or broadsheet on a mould, former or core; Shaping by spray-up, i.e. spraying of fibres on a mould, former or core
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/02—Layer formed of wires, e.g. mesh
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/085—Layered products comprising a layer of metal comprising metal 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 comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/14—Linings or internal coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • B65D90/04—Linings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
    • F16L58/1036—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being a preformed pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/103—Metal fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption
    • B32B2307/7265—Non-permeable

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention belongs to the field of fluoroplastic anticorrosive products, and particularly relates to an anti-permeation fluoroplastic product, a preparation method and anti-permeation anticorrosive container equipment. The permeation-resistant fluoroplastic product provided by the invention comprises a polytetrafluoroethylene composite barrier layer, wherein the polytetrafluoroethylene composite barrier layer is composed of Polytetrafluoroethylene (PTFE) and meltable polytetrafluoroethylene filled between the PTFE. The polytetrafluoroethylene composite barrier layer is composed of the polytetrafluoroethylene and the meltable polytetrafluoroethylene filled between the polytetrafluoroethylene, and the meltable polytetrafluoroethylene can flow at the conventional sintering temperature of the polytetrafluoroethylene and permeates into the polytetrafluoroethylene which is difficult to flow at high temperature, so that the crystallinity of the polytetrafluoroethylene composite barrier layer is increased compared with that of the conventional polytetrafluoroethylene layer, and the medium permeation resistance of the polytetrafluoroethylene composite barrier layer is increased.

Description

Permeation-resistant fluoroplastic product, preparation method and permeation-resistant anticorrosive container equipment
Technical Field
The invention belongs to the field of fluoroplastic anticorrosive products, and particularly relates to an anti-permeation fluoroplastic product, a preparation method and anti-permeation anticorrosive container equipment.
Background
Fluoroplastic products, especially polytetrafluoroethylene fluoroplastic products, have been widely used as liners of steel members such as chemical anticorrosion equipment and pipelines. With the development of science and technology, corrosion prevention equipment of the permeation-resistant fluoroplastic lining is used in more and more fields. In many fields, the requirement on the permeation resistance of anticorrosion equipment is very high, particularly in the fields of new energy, novel refrigerants, foaming agents and the like, a new medium is formed endlessly, the molecular structure of the product is special, the permeability is stronger, and a general polytetrafluoroethylene lining product can slowly permeate under the special medium of HF and the like, so that the quality of a product produced subsequently is not high. Through long-term research on polytetrafluoroethylene lining products, the inventor finds that the main reasons for low permeability of the polytetrafluoroethylene lining products are as follows: 1. the polytetrafluoroethylene material is difficult to flow at high temperature, so that the compactness of the polytetrafluoroethylene formed generally is not enough; 2. many fluoroplastics are formed by rotation-sintering or rotational molding (jet lining), and the compactness is not enough due to lack of pressure in the forming process; 3. the sheet material overlap joint inside lining, because there is the overlap joint welding seam, the welding seam performance is difficult to guarantee, the product wholeness is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a permeation-resistant fluoroplastic product, a preparation method and permeation-resistant anticorrosive container equipment.
In a first aspect of the invention, there is provided a permeation resistant fluoroplastic article comprising a composite barrier layer of Polytetrafluoroethylene (PTFE) and fusible polytetrafluoroethylene filled between the PTFE.
The polytetrafluoroethylene composite barrier layer is formed by sintering a composite material with a certain thickness formed by interweaving and winding a polytetrafluoroethylene film strip and a meltable polytetrafluoroethylene film strip.
The polytetrafluoroethylene composite barrier layer is formed by sintering a composite material with a certain thickness formed by interleaving at least one polytetrafluoroethylene film layer formed by winding a polytetrafluoroethylene film tape and at least one meltable polytetrafluoroethylene film layer formed by winding a meltable polytetrafluoroethylene film tape.
Including the metal net cover, the net hole of metal net cover makes for the rhombus metal net cover is along the scalable deformation of axial direction, the metal net cover inlays and establishes and makes polytetrafluoroethylene composite barrier layer divide into the polytetrafluoroethylene internal composite bed and the polytetrafluoroethylene external composite bed that are located the metal net cover in the polytetrafluoroethylene composite barrier layer, and polytetrafluoroethylene internal composite bed and polytetrafluoroethylene external composite bed form between the net hole of metal net cover and connect.
The metal net cover is a tubular metal net cover formed by weaving metal wires and metal wires in a warp-weft staggered mode or a tubular metal net cover formed by welding telescopic and deformable metal net pieces with rhombic grids in an end-to-end mode.
The negative pressure resistant fluoroplastic product is at least partially tubular with circular radial sections, at least one metal rib is embedded in the polytetrafluoroethylene composite barrier layer in the tubular structure with circular radial sections, and each metal rib is spirally and fixedly arranged along the circumference of the tubular structure.
And a bonding layer is arranged outside the polytetrafluoroethylene composite barrier layer, and is formed by bonding an inner bonding layer formed by meltable polytetrafluoroethylene and bonding an outer bonding layer formed by winding glass fibers and sintering.
In a second aspect of the present invention, there is provided a process for the preparation of a permeation resistant fluoroplastic article as hereinbefore described comprising the steps of:
the method comprises the following steps: winding a polytetrafluoroethylene film belt and a meltable polytetrafluoroethylene film belt outside a mold to form a composite material with a certain thickness;
step two: binding and fixing the composite material with certain thickness by using a glass fiber tape to form a glass fiber auxiliary layer;
step three: sintering in a sintering furnace, cooling, demolding and removing the glass fiber auxiliary layer.
In a third aspect of the present invention, there is provided a process for the preparation of a permeation resistant fluoroplastic article as hereinbefore described comprising the steps of:
the method comprises the following steps: winding a polytetrafluoroethylene film belt and a meltable polytetrafluoroethylene film belt outside a mold to form a composite material with a certain thickness as an inner layer;
step two: compressing the two axial ends of the metal net sleeve towards the center to enable the inner diameter of the metal net sleeve to be larger than the outer diameter of the inner layer formed in the first step, sleeving the metal net sleeve outside the inner layer formed in the first step, and then stretching the two axial ends of the metal net sleeve outwards to enable the metal net sleeve to be tightly attached outside the inner layer formed in the first step;
step three: winding a polytetrafluoroethylene film belt and a meltable polytetrafluoroethylene film belt outside the metal mesh sleeve formed in the step two to form a composite material with a certain thickness as an outer layer;
step four: binding and fixing the composite material with certain thickness by using a glass fiber tape to form a glass fiber auxiliary layer;
step five: sintering in a sintering furnace, cooling, demolding and removing the glass fiber auxiliary layer.
In a fourth aspect of the present invention, there is provided a permeation-resistant anticorrosive container apparatus, including a casing made of a metal material, wherein a fluoroplastic lining is attached to an inner surface of the casing, the fluoroplastic lining is a permeation-resistant fluoroplastic product as described above, and the fluoroplastic lining is a thin-wall layer having an integral seamless structure.
The invention has the following beneficial effects: the polytetrafluoroethylene composite barrier layer is composed of the polytetrafluoroethylene and the meltable polytetrafluoroethylene filled between the polytetrafluoroethylene, and the meltable polytetrafluoroethylene can flow at the conventional sintering temperature of the polytetrafluoroethylene and permeates into the polytetrafluoroethylene which is difficult to flow at high temperature, so that the crystallinity of the polytetrafluoroethylene composite barrier layer is increased compared with that of the conventional polytetrafluoroethylene layer, and the medium permeation resistance of the polytetrafluoroethylene composite barrier layer is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
FIG. 1 is a schematic representation of the structure of a permeation resistant fluoroplastic article according to the present invention;
FIG. 2 is a schematic structural view showing a structure of a composite material having a certain thickness according to example 1;
FIG. 3 is a schematic structural view of example 2;
FIG. 4 is a schematic structural view of embodiment 3;
FIG. 5 is a schematic structural view of example 4;
fig. 6 is a schematic structural view of the metal bar of examples 4 and 5;
FIG. 7 is a schematic structural view of example 5;
FIG. 8 is a schematic view of the structure of the assembled pipe of example 6;
FIG. 9 is a schematic view of the 90 ° elbow fitting of example 7 assembled;
FIG. 10 is a schematic view showing the construction of a three-way pipe joint according to example 7;
FIG. 11 is a schematic view of the structure of the assembled material container of example 8;
in the figure, 1, polytetrafluoroethylene; 2, fusible polytetrafluoroethylene; 3, a polytetrafluoroethylene film layer; 4, fusible polytetrafluoroethylene film tape; 5, polytetrafluoroethylene inner composite layer; 6, polytetrafluoroethylene outer composite layer; 7, a metal mesh sleeve; 701, welding edges; 8, metal ribs; 9, an adhesive layer; 10, bonding the inner layer; 11, bonding the outer layer; 12, a housing; 13, a flange; 14, fluoroplastic lining.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The terms of direction and position of the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction and position of the attached drawings. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the present invention.
The invention provides an anti-permeation fluoroplastic product, which comprises a polytetrafluoroethylene composite barrier layer, wherein the polytetrafluoroethylene composite barrier layer is composed of polytetrafluoroethylene 1 and meltable Polytetrafluoroethylene (PFA)2 filled between the polytetrafluoroethylene.
The polytetrafluoroethylene composite barrier layer is formed by sintering a composite material with a certain thickness formed by interweaving and winding a polytetrafluoroethylene film belt 3 and a meltable polytetrafluoroethylene film belt 4.
The polytetrafluoroethylene composite barrier layer can also be formed by sintering a composite material with a certain thickness formed by alternately overlapping at least one polytetrafluoroethylene film layer formed by winding a polytetrafluoroethylene film belt 3 and at least one meltable polytetrafluoroethylene film layer formed by winding a meltable polytetrafluoroethylene film belt 4.
The composite material with a certain thickness can be formed in two different modes simultaneously in the same embodiment, and the composite material with a certain thickness can also be formed in only one mode in the same embodiment.
Example 1:
a permeation-resistant fluoroplastic product is a polytetrafluoroethylene composite barrier layer, and the polytetrafluoroethylene composite barrier layer is formed by sintering a composite material which is formed by interlacing at least one polytetrafluoroethylene film layer 3 formed by winding polytetrafluoroethylene film strips and at least one meltable polytetrafluoroethylene film layer 4 formed by winding meltable polytetrafluoroethylene film strips and has a certain thickness.
As shown in fig. 2, the composite material is formed by sintering a composite material having a certain thickness, which is formed by overlapping a polytetrafluoroethylene film layer 3 formed by winding two layers of polytetrafluoroethylene film tapes and a meltable polytetrafluoroethylene film layer 4 formed by winding one layer of meltable polytetrafluoroethylene film tape and sandwiched between the two layers of polytetrafluoroethylene film layers 3.
Or formed by sintering a composite material with a certain thickness formed by overlapping a polytetrafluoroethylene film layer 3 formed by winding n layers of polytetrafluoroethylene film tapes and an n-1 layer of meltable polytetrafluoroethylene film layer 4 sandwiched between the polytetrafluoroethylene film layers 3.
The polytetrafluoroethylene composite barrier layer can also be formed by sintering a composite material with a certain thickness formed by interweaving and winding a polytetrafluoroethylene film strip and a meltable polytetrafluoroethylene film strip.
A permeation resistant fluoroplastic article, such as that shown in fig. 2, is prepared, for example, on a 4mm gauge scale, by the steps of:
the method comprises the following steps: winding a polytetrafluoroethylene film belt outside the die to form a polytetrafluoroethylene film layer 3 with the thickness of 2.5 mm;
step two: a meltable polytetrafluoroethylene film layer 4 with the thickness of 0.2mm is formed by winding a meltable polytetrafluoroethylene film belt outside the polytetrafluoroethylene film layer 3 formed in the step one;
step three: winding a polytetrafluoroethylene film belt outside the meltable polytetrafluoroethylene film layer 4 formed in the step two to form a polytetrafluoroethylene film layer 3 with the thickness of 1.5 mm;
step four: tightly binding the glass fiber auxiliary layer with the thickness of 2mm outside the polytetrafluoroethylene film layer 3 formed in the step three by using a glass fiber tape;
step five: sintering in a sintering furnace, cooling, demolding and removing the glass fiber auxiliary layer.
And step five, setting an optimized sintering process after the material is placed in a sintering furnace, controlling the temperature rise and fall speed to be 50 ℃ per hour, preserving the heat for 2 hours at the melting point of 320 ℃, including the temperature rise and fall time, and then preserving the heat for 3 hours at the temperature of 380 ℃.
The samples obtained by sintering through the optimal sintering process are respectively sampled at the upper position, the middle position and the lower position of the test to determine the density, and the determination results are shown in the following table:
Figure DEST_PATH_IMAGE001
as can be seen from the above table, the density distribution of the sample obtained by the optimal sintering process of the present embodiment is uniform and all achieve better effects.
And the crystallinity of the collected sample is measured by infrared absorption spectrometry, and the test results are shown in the following table:
Figure 583904DEST_PATH_IMAGE002
comparative example 1:
the fluoroplastic product takes a 4mm thickness specification as an example, and comprises the following steps:
the method comprises the following steps: winding a polytetrafluoroethylene film belt outside the die to form a polytetrafluoroethylene film layer with the thickness of 4 mm;
step two: tightly binding the polytetrafluoroethylene film layer formed in the step three with a glass fiber tape to form a glass fiber auxiliary layer with the thickness of 2 mm;
step three: sintering in a sintering furnace, cooling, demolding and removing the glass fiber auxiliary layer.
And step three, after the ceramic material is placed in a sintering furnace, setting a sintering process, controlling the temperature rising and falling speed to be 50 ℃ per hour, preserving the heat for 2 hours at the melting point of 320 ℃, including the temperature rising and falling time, and then preserving the heat for 3 hours at the temperature of 380 ℃.
The samples obtained by sintering through the sintering process are respectively sampled, measured and sealed at the upper position, the middle position and the lower position of the test, and the measurement results are shown in the following table:
Figure DEST_PATH_IMAGE003
as can be seen from the above table, the density distribution of the sample obtained by sintering according to the sintering process of this comparative example is slightly uneven, and the density has a certain difference compared with the sample of example 1, which directly affects the permeation resistance of the sample.
And the crystallinity of the collected sample is measured by infrared absorption spectrometry, and the test results are shown in the following table:
Figure 920951DEST_PATH_IMAGE004
as can be seen from the above table, the crystallinity of the sample sintered by the sintering process of this comparative example has a larger difference than that of the sample of example 1, which directly affects the permeation resistance of the sample.
The raw material polytetrafluoroethylene particles adopted in each embodiment and the comparative example are the same, the crystallinity of the raw material is tested by adopting an infrared absorption spectrometry method, the crystallinity is 88.3 percent, and the comparison of the crystallinity results in the comparative example 1 can determine that the crystallinity of the sample obtained by sintering through the sintering process is greatly reduced, and the crystallinity is greatly reduced after sintering because of poor flowability of the polytetrafluoroethylene. In combination with the crystallinity results of example 1, it can be shown that the incorporation of fusible polytetrafluoroethylene can significantly improve the crystallinity of the liner and increase the permeation resistance of the liner.
Example 2:
an anti-penetration fluoroplastic product comprises a polytetrafluoroethylene inner composite layer 5, a polytetrafluoroethylene outer composite layer 6 and a metal mesh sleeve 7 clamped between the polytetrafluoroethylene inner composite layer 5 and the polytetrafluoroethylene outer composite layer 6.
The inner composite polytetrafluoroethylene layer 5 and the outer composite polytetrafluoroethylene layer 6 in the permeation-resistant fluoroplastic product shown in fig. 3 are formed by sintering a composite material having a certain thickness formed by overlapping a polytetrafluoroethylene film layer 3 formed by winding a polytetrafluoroethylene film tape and a meltable polytetrafluoroethylene film layer 4 formed by winding a meltable polytetrafluoroethylene film tape. And the fusible polytetrafluoroethylene thin layers 4 of the composite materials with certain thickness on the two layers before sintering are both attached to the metal mesh 7, so that when sintering, the fusible polytetrafluoroethylene is melted into a flowing state, flows to the grid pores of the polytetrafluoroethylene thin layers 3 and the metal mesh 7, permeates into gaps of the polytetrafluoroethylene materials, fully fills the gaps of the polytetrafluoroethylene materials, and simultaneously forms good combination between the polytetrafluoroethylene inner composite layers 5 and the polytetrafluoroethylene outer composite layers 6.
The polytetrafluoroethylene inner composite layer 5 and/or the polytetrafluoroethylene outer composite layer 6 can also be formed by sintering a composite material with a certain thickness formed by interweaving and winding a polytetrafluoroethylene film belt and a meltable polytetrafluoroethylene film belt.
A permeation resistant fluoroplastic article, as shown in fig. 3, was prepared, for one thickness specification, by the following steps:
the method comprises the following steps: winding a polytetrafluoroethylene film belt outside the die to form a polytetrafluoroethylene film layer 3 with the thickness of 2.5 mm;
step two: a meltable polytetrafluoroethylene film layer 4 with the thickness of 0.2mm is formed by winding a meltable polytetrafluoroethylene film belt outside the polytetrafluoroethylene film layer 3 formed in the step one;
step three: shortening the metal mesh sleeve 4 which is telescopic in the axial direction to enable the diameter of the metal mesh sleeve to be slightly larger than the outer diameter of the meltable polytetrafluoroethylene film layer 4 formed in the step two, conveniently sleeving the metal mesh sleeve outside the metal mesh sleeve, and then stretching two end parts of the metal mesh sleeve 4 in the axial direction outwards to enable the diameter to be reduced in the stretching process until the metal mesh sleeve 4 is tightly attached to the outside of the meltable polytetrafluoroethylene film layer 4;
step four: a meltable polytetrafluoroethylene film layer 4 with the thickness of 0.2mm is formed by winding a meltable polytetrafluoroethylene film belt outside the metal mesh 4;
step five: a polytetrafluoroethylene film belt is wound outside the meltable polytetrafluoroethylene film layer 4 formed in the fourth step back to form a polytetrafluoroethylene film layer 3 with the thickness of 1.0 mm;
step six: tightly binding the polytetrafluoroethylene film layer 3 formed in the step five to a glass fiber auxiliary layer with the thickness of 2mm by using a glass fiber tape;
step seven: sintering in a sintering furnace, cooling, demolding and removing the glass fiber auxiliary layer.
Example 3:
a penetration-resistant fluoroplastic product comprises a polytetrafluoroethylene inner composite layer 5, a metal mesh 7, a polytetrafluoroethylene outer composite layer 6 and an adhesive layer 9 from inside to outside in sequence.
The inner composite polytetrafluoroethylene layer 5 and the outer composite polytetrafluoroethylene layer 6 in the permeation-resistant fluoroplastic product shown in fig. 4 are formed by sintering a composite material having a certain thickness and formed by overlapping a polytetrafluoroethylene film layer 3 formed by winding a polytetrafluoroethylene film tape and a meltable polytetrafluoroethylene film layer 4 formed by winding a meltable polytetrafluoroethylene film tape. And the fusible polytetrafluoroethylene thin layers 4 of the composite materials with certain thickness on the two layers before sintering are both attached to the metal mesh 7, so that when sintering, the fusible polytetrafluoroethylene is melted into a flowing state, flows to the grid pores of the polytetrafluoroethylene thin layers 3 and the metal mesh 7, permeates into gaps of the polytetrafluoroethylene materials, fully fills the gaps of the polytetrafluoroethylene materials, and simultaneously forms good combination between the polytetrafluoroethylene inner composite layers 5 and the polytetrafluoroethylene outer composite layers 6.
The polytetrafluoroethylene inner composite layer 5 and/or the polytetrafluoroethylene outer composite layer 6 can also be formed by sintering a composite material with a certain thickness formed by interweaving and winding a polytetrafluoroethylene film belt and a meltable polytetrafluoroethylene film belt.
The bonding layer 9 is formed by compounding and sintering an inner bonding layer 10 formed by meltable polytetrafluoroethylene and an outer bonding layer 11 formed by winding glass fibers.
A permeation resistant fluoroplastic article, as shown in fig. 4, was prepared, for one thickness specification, by the following steps:
the method comprises the following steps: winding a polytetrafluoroethylene film belt outside the die to form a polytetrafluoroethylene film layer 3 with the thickness of 2.5 mm;
step two: a meltable polytetrafluoroethylene film layer 4 with the thickness of 0.2mm is formed by winding a meltable polytetrafluoroethylene film belt outside the polytetrafluoroethylene film layer 3 formed in the step one;
step three: shortening the metal mesh sleeve 4 which is telescopic in the axial direction to enable the diameter of the metal mesh sleeve to be slightly larger than the outer diameter of the meltable polytetrafluoroethylene film layer 4 formed in the step two, conveniently sleeving the metal mesh sleeve outside the metal mesh sleeve, and then stretching two end parts of the metal mesh sleeve 4 in the axial direction outwards to enable the diameter to be reduced in the stretching process until the metal mesh sleeve 4 is tightly attached to the outside of the meltable polytetrafluoroethylene film layer 4;
step four: a meltable polytetrafluoroethylene film layer 4 with the thickness of 0.2mm is formed by winding a meltable polytetrafluoroethylene film belt outside the metal mesh 4;
step five: a polytetrafluoroethylene film belt is wound outside the meltable polytetrafluoroethylene film layer 4 formed in the fourth step back to form a polytetrafluoroethylene film layer 3 with the thickness of 1.0 mm;
step six: a meltable polytetrafluoroethylene film belt is wound back outside the polytetrafluoroethylene film layer 3 formed in the step five to form a bonding inner layer 10 with the thickness of 0.2 mm;
step seven: wrapping the bonding inner layer 10 formed in the sixth step with glass fiber cloth to form a bonding outer layer 11;
step eight: tightly binding the glass fiber auxiliary layer with a glass fiber tape to a thickness of 2mm outside the bonding outer layer 11 formed in the step eight;
step nine: tightly binding the glass fiber auxiliary layer with a glass fiber tape to a thickness of 2mm outside the bonding outer layer 11 formed in the step eight;
step ten: sintering in a sintering furnace, cooling, demolding and removing the glass fiber auxiliary layer.
Example 4:
an anti-permeation fluoroplastic product is characterized in that at least part of the anti-permeation fluoroplastic product is in a tubular shape with a circular radial section, and sequentially comprises a polytetrafluoroethylene inner composite layer 5, a metal net sleeve 7 and a polytetrafluoroethylene outer composite layer 6 from inside to outside, at least one metal rib 8 is embedded in the polytetrafluoroethylene inner composite layer 5 in the tubular structure with the circular radial section, and each metal rib 8 is spirally and fixedly arranged along the circumference of the tubular structure in a surrounding mode. The metal ribs 8 are spirally fixed in a surrounding manner, as shown in fig. 6, each section of the metal ribs is in the shape of a circular arc convex curve, and the metal mesh sleeves 4 on the periphery are matched to form a good supporting effect on adjacent polytetrafluoroethylene, so that the metal ribs are strong in dent resistance and can still keep the original shape under large negative pressure.
The anti-permeation fluoroplastic product provided by the embodiment can be used as an anti-corrosion lining for equipment such as pipelines (which can be straight pipes or bent pipes), kettles, towers and the like, the shape of the anti-permeation fluoroplastic product needs to be matched with the shape of the equipment, and the radial cross sections of the anti-permeation fluoroplastic product are all round tubular structures and can be straight pipes or bent pipes, equal-diameter pipes or unequal-diameter pipes.
Preferably, a metal rib 8 formed by continuously spirally winding a metal wire with a certain diameter is arranged in a tubular structure with a circular radial section, and two axial ends of the metal rib 8 are arranged close to two axial ends of the tubular structure. By "close" is meant that there is a negligible or no spacing between the tubular structures at the same axial location or in the axial direction that does not affect the overall strength, so that the tubular structure is fully protected against negative pressure deformation by the helical metal ribs 8. Or a plurality of metal ribs 8 formed by continuously spirally winding metal wires with certain diameters are arranged in a tubular structure with a circular radial section and connected end to end, and the connecting parts are connected in a stamping, welding or winding way, but the thickness of the connecting parts is thicker, and the prepared anti-permeation fluoroplastic product is not uniformly distributed. Or a plurality of metal ribs 8 formed by continuously spirally winding metal wires with certain diameters can be arranged in a tubular structure with a circular radial section from inside to outside in a multilayer manner, but the combination degree of materials at two sides of each metal rib 8 is poor.
The inner composite polytetrafluoroethylene layer 5 and the outer composite polytetrafluoroethylene layer 6 in the permeation-resistant fluoroplastic product shown in fig. 5 are formed by sintering a composite material having a certain thickness formed by overlapping a polytetrafluoroethylene film layer 3 formed by winding a polytetrafluoroethylene film tape and a meltable polytetrafluoroethylene film layer 4 formed by winding a meltable polytetrafluoroethylene film tape. And the fusible polytetrafluoroethylene thin layers 4 of the composite materials with certain thickness on the two layers before sintering are both attached to the metal mesh 7, so that when sintering, the fusible polytetrafluoroethylene is melted into a flowing state, flows to the grid pores of the polytetrafluoroethylene thin layers 3 and the metal mesh 7, permeates into gaps of the polytetrafluoroethylene materials, fully fills the gaps of the polytetrafluoroethylene materials, and simultaneously forms good combination between the polytetrafluoroethylene inner composite layers 5 and the polytetrafluoroethylene outer composite layers 6.
The polytetrafluoroethylene inner composite layer 5 and/or the polytetrafluoroethylene outer composite layer 6 can also be formed by sintering a composite material with a certain thickness formed by interweaving and winding a polytetrafluoroethylene film belt and a meltable polytetrafluoroethylene film belt.
The bonding layer 9 is formed by compounding and sintering an inner bonding layer 10 formed by meltable polytetrafluoroethylene and an outer bonding layer 11 formed by winding glass fibers.
A permeation resistant fluoroplastic article, as shown in fig. 5, was prepared, for one thickness specification, by the following steps:
the method comprises the following steps: winding a polytetrafluoroethylene film belt outside a die to form a polytetrafluoroethylene film layer 3 with the thickness of 1.0mm, spirally winding a steel wire in a circle to be attached and wound outside the polytetrafluoroethylene film layer 3 to form a metal rib 8, and leaving a hole between main adjacent circles when winding the steel wire;
step two: winding a polytetrafluoroethylene film layer 3 with the thickness of 0.5mm outside the metal ribs 8 formed in the step one by adopting a polytetrafluoroethylene film tape, and winding a meltable polytetrafluoroethylene film layer 4 with the thickness of 0.2mm outside the polytetrafluoroethylene film layer 3 by adopting a meltable polytetrafluoroethylene film tape;
step three: shortening the metal mesh sleeve 4 which is telescopic in the axial direction to enable the diameter of the metal mesh sleeve to be slightly larger than the outer diameter of the meltable polytetrafluoroethylene film layer 4 formed in the step two, conveniently sleeving the metal mesh sleeve outside the metal mesh sleeve, and then stretching two end parts of the metal mesh sleeve 4 in the axial direction outwards to enable the diameter to be reduced in the stretching process until the metal mesh sleeve 4 is tightly attached to the outside of the meltable polytetrafluoroethylene film layer 4;
step four: a meltable polytetrafluoroethylene film layer 4 with the thickness of 0.2mm is formed by winding a meltable polytetrafluoroethylene film belt outside the metal mesh 4;
step five: a polytetrafluoroethylene film belt is wound outside the meltable polytetrafluoroethylene film layer 4 formed in the fourth step back to form a polytetrafluoroethylene film layer 3 with the thickness of 1.0 mm;
step six: a meltable polytetrafluoroethylene film belt is wound back outside the polytetrafluoroethylene film layer 3 formed in the step five to form a bonding inner layer 10 with the thickness of 0.2 mm;
step seven: wrapping the bonding inner layer 10 formed in the sixth step with glass fiber cloth to form a bonding outer layer 11;
step eight: tightly binding the glass fiber auxiliary layer with a glass fiber tape to a thickness of 2mm outside the bonding outer layer 11 formed in the step eight;
step nine: tightly binding the glass fiber auxiliary layer with a glass fiber tape to a thickness of 2mm outside the bonding outer layer 11 formed in the step eight;
step ten: sintering in a sintering furnace, cooling, demolding and removing the glass fiber auxiliary layer.
Example 5:
a permeation resistant fluoroplastic article, as shown in FIG. 7, is prepared by adding a bonding layer 9 to the permeation resistant fluoroplastic article provided in example 4, wherein the bonding layer 9 is formed by composite sintering of a bonding inner layer 10 formed of meltable polytetrafluoroethylene and a bonding outer layer 11 formed by winding glass fibers. The preparation of the adhesive layer 9 was identical to that of example 3.
Example 6:
a permeation resistant fluoroplastic lined pipe, which may be a straight pipe as shown in fig. 8, includes a casing 12 made of a metal material such as steel, flanges 13 made of a metal material such as steel and disposed at both ends of the casing 12 for connection, and a fluoroplastic lining 14 connected to an inner wall of the casing 12, wherein the fluoroplastic lining 14 may be the permeation resistant fluoroplastic lined product as provided in any one of embodiments 1 to 5, and a portion disposed inside the casing 12 has a tubular structure with a circular radial cross section.
When the anti-permeation fluoroplastic lining product without the adhesive layer 9 is adopted, during preparation, the outer wall of the anti-permeation fluoroplastic lining product is subjected to sodium treatment, a binder is coated on the surface of the round anti-permeation fluoroplastic lining product, then the round anti-permeation fluoroplastic lining product is sleeved in the steel shell, the two ends of the round anti-permeation fluoroplastic lining product are flanged to enable the round anti-permeation fluoroplastic lining product to be flatly attached to the sealing surface of the steel flange 13, and the outer wall of the round anti-permeation fluoroplastic lining product is tightly attached to the inner wall of the steel shell by injecting water or high-pressure gas into the round anti-permeation fluoroplastic lining product after the round anti-permeation fluoroplastic lining product is sealed in a pressurizing mode until the binder is completely cured.
When the permeation-resistant fluoroplastic lining product with the adhesive layer 9 is used, during preparation, an adhesive is coated on the surface of the outer wall of the permeation-resistant fluoroplastic lining product, then the permeation-resistant fluoroplastic lining product is sleeved in the steel shell, the two ends of the permeation-resistant fluoroplastic lining product are flanged to enable the permeation-resistant fluoroplastic lining product to be flatly attached to the sealing surface of the steel flange 13, and the outer wall of the circular permeation-resistant fluoroplastic product is tightly attached to the inner wall of the steel shell by injecting water or high-pressure gas into the circular permeation-resistant fluoroplastic product after the circular permeation-resistant fluoroplastic lining product is sealed in a pressurizing mode until the adhesive is completely cured.
Example 7:
a pipe joint member with a permeation resistant fluoroplastic lining, comprising a casing 12 made of a metal material such as steel and provided with at least two joints, a flange 13 made of a metal material such as steel and provided at the joint end of the casing 12 for connection, and a fluoroplastic lining 14 connected to the inner wall of the casing 12, wherein the fluoroplastic lining 14 may be the product of any one of embodiments 1 to 5, and the portion provided inside the casing 12 has a tubular structure with at least one circular radial cross section.
Fig. 9 shows a 90 ° elbow fitting with two ports in the housing 12, and an elbow tubular structure with a circular radial cross-section is provided therein.
Three or more joints can be used, such as the tee shown in fig. 10. The tee fitting of figure 10 is formed by joining two tubular structures having circular radial cross-sections to a fluoroplastic lining 14.
Example 8:
a permeation resistant fluoroplastic lined vessel comprising a shell 12 of a metal material such as steel and having at least one opening, a flange 13 of a metal material such as steel provided at the opening of the shell 12 for connecting a closure or a pipe, and a fluoroplastic lining 14 attached to the inner wall of the shell 12, wherein the fluoroplastic lining 14 may be the permeation resistant fluoroplastic lined article as described in any one of embodiments 1 to 5, and the portion provided inside the shell 12 has a tubular configuration with at least one circular radial cross-section. The container can be a storage tank, a reaction kettle and other common containers capable of containing materials.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.

Claims (10)

1. A permeation resistant fluoroplastic article characterized by: the polytetrafluoroethylene composite barrier layer is composed of polytetrafluoroethylene (1) and fusible polytetrafluoroethylene (2) filled between the polytetrafluoroethylene.
2. A permeation resistant fluoroplastic article according to claim 1 wherein: the polytetrafluoroethylene composite barrier layer is formed by sintering a composite material with a certain thickness formed by interweaving and winding a polytetrafluoroethylene film strip and a meltable polytetrafluoroethylene film strip.
3. A permeation resistant fluoroplastic article according to claim 1 wherein: the polytetrafluoroethylene composite barrier layer is formed by sintering a composite material which is formed by alternately forming a polytetrafluoroethylene film layer (3) formed by winding at least one polytetrafluoroethylene film strip and a meltable polytetrafluoroethylene film layer (4) formed by winding at least one meltable polytetrafluoroethylene film strip and has a certain thickness.
4. A permeation resistant fluoroplastic article according to claim 1 wherein: including metal net cover (7), the net hole of metal net cover (7) makes for the rhombus metal net cover (7) is along the scalable deformation of axial direction, metal net cover (7) inlay to establish and make polytetrafluoroethylene composite barrier layer divide into in the polytetrafluoroethylene composite barrier layer that is located metal net cover (7) composite bed (5) and polytetrafluoroethylene outer composite bed (6), and composite bed (5) and polytetrafluoroethylene outer composite bed (6) form between the net hole of metal net cover (7) and are connected in the polytetrafluoroethylene.
5. A permeation resistant fluoroplastic article according to claim 4 wherein: the metal net sleeve (7) is a tubular metal net sleeve formed by weaving metal wires and metal wires in a warp-weft staggered mode or a tubular metal net sleeve formed by welding telescopic and deformable metal net pieces with diamond-shaped grids in an end-to-end mode.
6. A permeation resistant fluoroplastic article according to claim 1 wherein: the negative pressure resistant fluoroplastic product is at least partially tubular with circular radial sections, at least one metal rib (8) is embedded in the polytetrafluoroethylene composite barrier layer in the tubular structure with circular radial sections, and each metal rib (8) is spirally and fixedly arranged along the circumference of the tubular structure.
7. A permeation resistant fluoroplastic article according to claim 1 wherein: the polytetrafluoroethylene composite barrier layer is externally provided with a bonding layer (9), and the bonding layer (9) is formed by winding a bonding inner layer (10) formed by meltable polytetrafluoroethylene and glass fibers to form a bonding outer layer (11) through composite sintering.
8. A process for preparing a permeation resistant fluoroplastic article according to any one of claims 1 to 7 comprising the steps of:
the method comprises the following steps: winding a polytetrafluoroethylene film belt and a meltable polytetrafluoroethylene film belt outside a mold to form a composite material with a certain thickness;
step two: binding and fixing the composite material with certain thickness by using a glass fiber tape to form a glass fiber auxiliary layer;
step three: sintering in a sintering furnace, cooling, demolding and removing the glass fiber auxiliary layer.
9. A process for preparing a permeation resistant fluoroplastic article according to claim 4 or claim 5 comprising the steps of:
the method comprises the following steps: winding a polytetrafluoroethylene film belt and a meltable polytetrafluoroethylene film belt outside a mold to form a composite material with a certain thickness as an inner layer;
step two: compressing the two axial ends of the metal net sleeve (7) towards the center to enable the inner diameter of the metal net sleeve (7) to be larger than the outer diameter of the inner layer formed in the first step, sleeving the metal net sleeve (7) outside the inner layer formed in the first step, and then stretching the two axial ends of the metal net sleeve (7) outwards to enable the metal net sleeve (7) to be tightly attached outside the inner layer formed in the first step;
step three: winding a polytetrafluoroethylene film belt and a meltable polytetrafluoroethylene film belt outside the die to form a composite material with a certain thickness as an outer layer outside the metal mesh sleeve (7) formed in the second step;
step four: binding and fixing the composite material with certain thickness by using a glass fiber tape to form a glass fiber auxiliary layer;
step five: sintering in a sintering furnace, cooling, demolding and removing the glass fiber auxiliary layer.
10. A permeation resistant corrosion resistant container apparatus comprising a shell of metal material having attached to its inner surface a fluoroplastic lining, said fluoroplastic lining being a permeation resistant fluoroplastic article according to any one of claims 1 to 7, said fluoroplastic lining being a thin walled layer of unitary seamless construction.
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