CN113895124B - Permeation-resistant fluoroplastic product, preparation method and permeation-resistant and corrosion-resistant container equipment - Google Patents

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

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CN113895124B
CN113895124B CN202111257465.1A CN202111257465A CN113895124B CN 113895124 B CN113895124 B CN 113895124B CN 202111257465 A CN202111257465 A CN 202111257465A CN 113895124 B CN113895124 B CN 113895124B
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polytetrafluoroethylene
layer
composite
permeation
metal net
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CN113895124A (en
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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 form; Layered products 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 form; Layered products 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 form; Layered products 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

Abstract

The invention belongs to the field of fluoroplastic anti-corrosion products, and particularly relates to a permeation-resistant fluoroplastic product, a preparation method and permeation-resistant anti-corrosion 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 fusible polytetrafluoroethylene filled between the polytetrafluoroethylene. The invention adopts the polytetrafluoroethylene composite barrier layer composed of polytetrafluoroethylene and fusible polytetrafluoroethylene filled between polytetrafluoroethylene, and as the fusible polytetrafluoroethylene can flow at the conventional sintering temperature of polytetrafluoroethylene and permeate into polytetrafluoroethylene which is difficult to flow at high temperature, the crystallinity of the polytetrafluoroethylene composite barrier layer is increased compared with that of the conventional polytetrafluoroethylene layer, thereby increasing the medium permeation resistance of the polytetrafluoroethylene composite barrier layer.

Description

Permeation-resistant fluoroplastic product, preparation method and permeation-resistant and corrosion-resistant container equipment
Technical Field
The invention belongs to the field of fluoroplastic anti-corrosion products, and particularly relates to a permeation-resistant fluoroplastic product, a preparation method and permeation-resistant anti-corrosion container equipment.
Background
Fluoroplastic products, particularly those made of polytetrafluoroethylene, have been widely used as inner liners for steel members such as chemical corrosion protection equipment and pipes. With the development of technology, anti-permeation fluoroplastic lined anti-corrosion equipment is used in more and more fields. In many fields, the permeation resistance requirement on the anti-corrosion equipment is very high, especially in the fields of new energy sources, novel refrigerants, foaming agents and the like, a new medium layer is infinite, the molecular structure is special, the permeability is stronger, and a general polytetrafluoroethylene lining product slowly permeates under special media such as HF and the like, so that the quality of products produced later is low. Through long-term research on polytetrafluoroethylene lining products, the inventor discovers 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 which is generally formed is insufficient; 2. many fluoroplastics are molded by spin-bake or roto-molding (injection lining), and the compactness is insufficient due to lack of pressure in the molding process; 3. the lap joint lining of the plate is difficult to ensure the performance of the lap joint weld joint due to the existence of the lap joint weld joint, and the product integrity is poor.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the prior art and provides a permeation-resistant fluoroplastic product, a preparation method and permeation-resistant and corrosion-resistant container equipment.
In a first aspect of the present invention, a permeation resistant fluoroplastic article is provided that comprises a polytetrafluoroethylene composite barrier layer comprised of Polytetrafluoroethylene (PTFE) and a fusible polytetrafluoroethylene filled between polytetrafluoroethylene.
The polytetrafluoroethylene composite barrier layer is formed by sintering a composite material with a certain thickness, wherein the composite material is formed by interweaving and winding polytetrafluoroethylene film strips and fusible polytetrafluoroethylene film strips.
The polytetrafluoroethylene composite barrier layer is formed by sintering a composite material with a certain thickness, wherein the composite material is formed by interlacing at least one polytetrafluoroethylene film layer formed by winding a polytetrafluoroethylene film belt and at least one fusible polytetrafluoroethylene film layer formed by winding a fusible polytetrafluoroethylene film belt.
The polytetrafluoroethylene composite barrier layer is embedded in the polytetrafluoroethylene composite barrier layer, the polytetrafluoroethylene composite barrier layer is divided into a polytetrafluoroethylene inner composite layer and a polytetrafluoroethylene outer composite layer which are positioned in the metal mesh sleeve, and the polytetrafluoroethylene inner composite layer and the polytetrafluoroethylene outer composite layer are connected between the mesh holes of the metal mesh sleeve.
The metal net sleeve is a tubular metal net sleeve formed by interweaving metal wires and warps and wefts or a tubular metal net sleeve formed by welding telescopic deformed metal net sheets with rhombic grids end to end.
The permeation resistant fluoroplastic product is characterized in that at least part of the permeation resistant fluoroplastic product is tubular, the radial sections of the permeation resistant fluoroplastic product are all circular, at least one metal rib is embedded in the polytetrafluoroethylene composite barrier layer in a tubular structure, and each metal rib is spirally and fixedly arranged along the circumference of the tubular structure.
The adhesive layer is arranged outside the polytetrafluoroethylene composite barrier layer, and is formed by composite sintering of an adhesive inner layer formed by fusible polytetrafluoroethylene and an adhesive outer layer formed by winding glass fibers.
In a second aspect of the present invention, there is provided a method of making a permeation resistant fluoroplastic article as described above comprising the steps of:
step one: winding a polytetrafluoroethylene film belt and a fusible polytetrafluoroethylene film belt outside a die to form a composite material with a certain thickness;
step two: binding and fixing the composite material with a certain thickness by using a glass fiber belt to form a glass fiber auxiliary layer;
step three: sintering in sintering furnace, cooling, demolding and dismantling the auxiliary glass fiber layer.
In a third aspect of the present invention, there is provided a method of making a permeation resistant fluoroplastic article as described above comprising the steps of:
step one: winding a polytetrafluoroethylene film belt and a fusible polytetrafluoroethylene film belt outside a die 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, and stretching the two axial ends of the metal net sleeve outwards to enable the metal net sleeve to be tightly attached to the outer layer formed in the first step after the metal net sleeve is sleeved outside the inner layer formed in the first step;
step three: a polytetrafluoroethylene film belt and a fusible polytetrafluoroethylene film belt are adopted outside the metal net sleeve formed in the second step, and a composite material with a certain thickness is formed by winding outside a mould to serve as an outer layer;
step four: binding and fixing the composite material with a certain thickness by using a glass fiber belt to form a glass fiber auxiliary layer;
step five: sintering in sintering furnace, cooling, demolding and dismantling the auxiliary glass fiber layer.
In a fourth aspect of the present invention, there is provided a permeation-resistant and corrosion-resistant container apparatus comprising a housing made of a metal material, wherein a fluoroplastic lining is attached to the inner surface of the housing, the fluoroplastic lining being a permeation-resistant fluoroplastic article as described above, and the fluoroplastic lining being a thin-walled layer of unitary seamless construction.
The beneficial effects of the invention are as follows: the invention adopts the polytetrafluoroethylene composite barrier layer composed of polytetrafluoroethylene and fusible polytetrafluoroethylene filled between polytetrafluoroethylene, and as the fusible polytetrafluoroethylene can flow at the conventional sintering temperature of polytetrafluoroethylene and permeate into polytetrafluoroethylene which is difficult to flow at high temperature, the crystallinity of the polytetrafluoroethylene composite barrier layer is increased compared with that of the conventional polytetrafluoroethylene layer, thereby increasing the medium permeation resistance of the polytetrafluoroethylene composite barrier layer.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
FIG. 1 is a schematic view of the structure of a permeation resistant fluoroplastic article of the present invention;
FIG. 2 is a schematic structural view of a structure of a composite material having a certain thickness in example 1;
fig. 3 is a schematic structural view of embodiment 2;
fig. 4 is a schematic structural view of embodiment 3;
fig. 5 is a schematic structural view of embodiment 4;
fig. 6 is a schematic structural view of the metal ribs of embodiment 4 and embodiment 5;
fig. 7 is a schematic structural view of embodiment 5;
FIG. 8 is a schematic structural view of a pipe fitting assembled in accordance with example 6;
FIG. 9 is a schematic view of a 90 ° elbow joint formed by assembling example 7;
FIG. 10 is a schematic view of the three-way joint according to the assembled embodiment 7;
FIG. 11 is a schematic view of the assembled material container of example 8;
in the figure, 1, polytetrafluoroethylene; 2, fusible polytetrafluoroethylene; 3, a polytetrafluoroethylene film layer; 4, a fusible polytetrafluoroethylene film tape; 5, a polytetrafluoroethylene inner composite layer; 6, an outer polytetrafluoroethylene composite layer; 7, a metal net sleeve; 701, welding edges; 8, metal ribs; 9, an adhesive layer; 10, bonding an inner layer; 11, bonding the outer layer; 12, a housing; 13, a flange; a fluoroplastic lining.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
The terms of direction and position in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer only to the direction or position of the drawing. Accordingly, directional and positional terms are used to illustrate and understand the invention and are not intended to limit the scope of the invention.
The invention provides a permeation resistant fluoroplastic product, which comprises a polytetrafluoroethylene composite barrier layer, wherein the polytetrafluoroethylene composite barrier layer is composed of polytetrafluoroethylene 1 and fusible Polytetrafluoroethylene (PFA) 2 filled between polytetrafluoroethylene.
The polytetrafluoroethylene composite barrier layer is formed by sintering a composite material with a certain thickness, which is formed by interweaving and winding a polytetrafluoroethylene film strip 3 and a fusible polytetrafluoroethylene film strip 4.
The polytetrafluoroethylene composite barrier layer can also be formed by sintering a composite material with a certain thickness, wherein the composite material is formed by alternately superposing at least one polytetrafluoroethylene film layer formed by winding a polytetrafluoroethylene film strip 3 and at least one fusible polytetrafluoroethylene film layer formed by winding a fusible polytetrafluoroethylene film strip 4.
The composite material with certain thickness formed by two different modes can be adopted in the same embodiment at the same time, or the composite material with certain thickness formed by only one mode can be adopted in the same embodiment.
Example 1:
a permeation resistant fluoroplastic product is a polytetrafluoroethylene composite barrier layer, which is formed by sintering a composite material with a certain thickness, wherein the composite material is formed by interlacing at least one polytetrafluoroethylene film layer 3 formed by winding a polytetrafluoroethylene film strip and at least one fusible polytetrafluoroethylene film layer 4 formed by winding a fusible polytetrafluoroethylene film strip.
As shown in fig. 2, the composite material with a certain thickness is formed by sintering a polytetrafluoroethylene film layer 3 formed by winding two polytetrafluoroethylene film strips and a fusible polytetrafluoroethylene film layer 4 formed by winding a fusible polytetrafluoroethylene film strip and sandwiched between the two polytetrafluoroethylene film layers 3.
The composite material with a certain thickness formed by overlapping n polytetrafluoroethylene film layers 3 formed by winding n polytetrafluoroethylene film strips and n-1 fusible polytetrafluoroethylene film layers 4 clamped between the polytetrafluoroethylene film layers 3 can also be formed after sintering.
The polytetrafluoroethylene composite barrier layer can also be formed by sintering a composite material with a certain thickness, wherein the composite material is formed by interweaving and winding a polytetrafluoroethylene film belt and a fusible polytetrafluoroethylene film belt.
The permeation resistant fluoroplastic article shown in FIG. 2 was prepared, taking a thickness specification of about 4mm as an example, by the steps of:
step one: winding a polytetrafluoroethylene film strip outside a die to form a polytetrafluoroethylene film layer 3 with the thickness of 2.5 mm;
step two: winding a fusible polytetrafluoroethylene film strip outside the polytetrafluoroethylene film layer 3 formed in the first step to form a fusible polytetrafluoroethylene film layer 4 with the thickness of 0.2 mm;
step three: winding a polytetrafluoroethylene film strip outside the fusible polytetrafluoroethylene film layer 4 formed in the second step to form a polytetrafluoroethylene film layer 3 with the thickness of 1.5 mm;
step four: tightly binding the polytetrafluoroethylene film layer 3 formed in the third step to a glass fiber auxiliary layer with the thickness of 2mm by using a glass fiber tape;
step five: sintering in sintering furnace, cooling, demolding and dismantling the auxiliary glass fiber layer.
And fifthly, setting an optimized sintering process after the material is placed in a sintering furnace, controlling the temperature rise and reduction speed to be 50 ℃ per hour, and preserving heat for 2 hours at the melting point of 320 ℃ including the temperature rise and reduction time, and preserving heat for 3 hours at the temperature of 380 ℃.
The samples obtained by sintering the optimal sintering process are respectively sampled and measured for density 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 SMS_1
from the above table, the density distribution of the samples obtained by sintering by the optimal sintering process in this embodiment is uniform and achieves a good effect.
And the crystallinity of the collected sample was measured by infrared absorption spectrometry, and the test results are shown in the following table:
Figure SMS_2
comparative example 1:
the fluoroplastic product is exemplified by a 4mm thickness specification, and comprises the following steps:
step one: winding a polytetrafluoroethylene film strip outside a die to form a polytetrafluoroethylene film layer with the thickness of 4 mm;
step two: tightly bundling the polytetrafluoroethylene film layer formed in the third step to a glass fiber auxiliary layer with the thickness of 2mm by using a glass fiber belt;
step three: sintering in sintering furnace, cooling, demolding and dismantling the auxiliary glass fiber layer.
And thirdly, setting a sintering process after the material is placed in a sintering furnace, controlling the temperature rise and fall speed to be 50 ℃ per hour, and preserving heat for 2 hours at the melting point of 320 ℃ including the temperature rise and fall time, and preserving heat for 3 hours at the temperature of 380 ℃.
The samples obtained by sintering 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 SMS_3
from the above table, the density distribution of the samples obtained by sintering by the sintering process of this comparative example was slightly uneven and the density was slightly different from that of the samples of example 1, which directly affects the permeation resistance of the samples.
And the crystallinity of the collected sample was measured by infrared absorption spectrometry, and the test results are shown in the following table:
Figure SMS_4
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 example and comparative example are the same, the crystallinity of the raw material is tested by adopting an infrared absorption spectrum method, the crystallinity is 88.3%, and the comparison of the crystallinity results of comparative example 1 can confirm that the crystallinity of the sample obtained after sintering by the sintering process is greatly reduced, and the reason is that the crystallinity is greatly reduced after sintering due to the poor flowability of polytetrafluoroethylene. In combination with the crystallinity results of example 1, it can be demonstrated that incorporation of fusible polytetrafluoroethylene can significantly increase the crystallinity of the liner and increase the permeation resistance of the liner.
Example 2:
a permeation resistant fluoroplastic product is composed of an inner polytetrafluoroethylene composite layer 5, an outer polytetrafluoroethylene composite layer 6, and a metal mesh 7 sandwiched between the inner polytetrafluoroethylene composite layer 5 and the outer polytetrafluoroethylene composite layer 6.
The inner polytetrafluoroethylene composite layer 5 and the outer polytetrafluoroethylene composite layer 6 in the permeation-resistant fluoroplastic product shown in fig. 3 are respectively formed by sintering a composite material with a certain thickness, wherein the composite material is formed by superposing a polytetrafluoroethylene film layer 3 formed by winding a polytetrafluoroethylene film strip and a fusible polytetrafluoroethylene film layer 4 formed by winding a fusible polytetrafluoroethylene film strip. And the fusible polytetrafluoroethylene film layers 4 of the composite materials with certain thickness are all attached to the metal net sleeve 7 before sintering, so that when sintering, the fusible polytetrafluoroethylene is melted into a flowing shape, flows to grid holes of the polytetrafluoroethylene film layer 3 and the metal net sleeve 7, permeates into gaps of polytetrafluoroethylene materials, fully fills the gaps of the polytetrafluoroethylene materials, and simultaneously forms good combination between the polytetrafluoroethylene inner composite layer 5 and the polytetrafluoroethylene outer composite layer 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, which is formed by interweaving and winding a polytetrafluoroethylene film belt and a fusible polytetrafluoroethylene film belt.
The permeation resistant fluoroplastic article shown in fig. 3 was prepared by taking a thickness specification as an example, and the steps thereof were as follows:
step one: winding a polytetrafluoroethylene film strip outside a die to form a polytetrafluoroethylene film layer 3 with the thickness of 2.5 mm;
step two: winding a fusible polytetrafluoroethylene film strip outside the polytetrafluoroethylene film layer 3 formed in the first step to form a fusible polytetrafluoroethylene film layer 4 with the thickness of 0.2 mm;
step three: the metal net sleeve 4 which is telescopic in the axial direction is shortened to enable the diameter of the metal net sleeve to be slightly larger than the outer diameter of the fusible polytetrafluoroethylene film layer 4 formed in the second step, the metal net sleeve is conveniently sleeved outside the fusible polytetrafluoroethylene film layer 4, then the two end parts of the metal net sleeve 4 in the axial direction are outwards stretched, and the diameter of the metal net sleeve is reduced in the stretching process until the metal net sleeve 4 is tightly attached to the fusible polytetrafluoroethylene film layer 4;
step four: winding a fusible polytetrafluoroethylene film tape outside the metal net sleeve 4 to form a fusible polytetrafluoroethylene film layer 4 with the thickness of 0.2 mm;
step five: the polytetrafluoroethylene film strip is adopted to form a polytetrafluoroethylene film layer 3 with the thickness of 1.0mm by winding back outside the fusible polytetrafluoroethylene film layer 4 formed in the step four;
step six: tightly bundling the polytetrafluoroethylene film layer 3 formed in the fifth step to a glass fiber auxiliary layer with the thickness of 2mm by using a glass fiber belt;
step seven: sintering in sintering furnace, cooling, demolding and dismantling the auxiliary glass fiber layer.
Example 3:
a permeation resistant fluoroplastic product comprises a polytetrafluoroethylene inner composite layer 5, a metal net cover 7, a polytetrafluoroethylene outer composite layer 6 and an adhesive layer 9 from inside to outside.
The inner polytetrafluoroethylene composite layer 5 and the outer polytetrafluoroethylene composite layer 6 in the permeation-resistant fluoroplastic product shown in fig. 4 are respectively formed by sintering a composite material with a certain thickness, wherein the composite material is formed by superposing a polytetrafluoroethylene film layer 3 formed by winding a polytetrafluoroethylene film strip and a fusible polytetrafluoroethylene film layer 4 formed by winding a fusible polytetrafluoroethylene film strip. And the fusible polytetrafluoroethylene film layers 4 of the composite materials with certain thickness are all attached to the metal net sleeve 7 before sintering, so that when sintering, the fusible polytetrafluoroethylene is melted into a flowing shape, flows to grid holes of the polytetrafluoroethylene film layer 3 and the metal net sleeve 7, permeates into gaps of polytetrafluoroethylene materials, fully fills the gaps of the polytetrafluoroethylene materials, and simultaneously forms good combination between the polytetrafluoroethylene inner composite layer 5 and the polytetrafluoroethylene outer composite layer 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, which is formed by interweaving and winding a polytetrafluoroethylene film belt and a fusible polytetrafluoroethylene film belt.
Wherein the bonding layer 9 is formed by composite sintering of a bonding inner layer 10 formed by fusible polytetrafluoroethylene and a bonding outer layer 11 formed by winding glass fibers.
The permeation resistant fluoroplastic article shown in fig. 4 was prepared by taking a thickness specification as an example, and the steps thereof were as follows:
step one: winding a polytetrafluoroethylene film strip outside a die to form a polytetrafluoroethylene film layer 3 with the thickness of 2.5 mm;
step two: winding a fusible polytetrafluoroethylene film strip outside the polytetrafluoroethylene film layer 3 formed in the first step to form a fusible polytetrafluoroethylene film layer 4 with the thickness of 0.2 mm;
step three: the metal net sleeve 4 which is telescopic in the axial direction is shortened to enable the diameter of the metal net sleeve to be slightly larger than the outer diameter of the fusible polytetrafluoroethylene film layer 4 formed in the second step, the metal net sleeve is conveniently sleeved outside the fusible polytetrafluoroethylene film layer 4, then the two end parts of the metal net sleeve 4 in the axial direction are outwards stretched, and the diameter of the metal net sleeve is reduced in the stretching process until the metal net sleeve 4 is tightly attached to the fusible polytetrafluoroethylene film layer 4;
step four: winding a fusible polytetrafluoroethylene film tape outside the metal net sleeve 4 to form a fusible polytetrafluoroethylene film layer 4 with the thickness of 0.2 mm;
step five: the polytetrafluoroethylene film strip is adopted to form a polytetrafluoroethylene film layer 3 with the thickness of 1.0mm by winding back outside the fusible polytetrafluoroethylene film layer 4 formed in the step four;
step six: forming an adhesive inner layer 10 with the thickness of 0.2mm by adopting a fusible polytetrafluoroethylene film tape to be wound outside the polytetrafluoroethylene film layer 3 formed in the step five;
step seven: wrapping the bonding inner layer 10 formed in the step six by using glass fiber cloth to form a bonding outer layer 11;
step eight: tightly bundling the bonding outer layer 11 formed in the step eight to a glass fiber auxiliary layer with the thickness of 2mm by using a glass fiber belt;
step nine: tightly bundling the bonding outer layer 11 formed in the step eight to a glass fiber auxiliary layer with the thickness of 2mm by using a glass fiber belt;
step ten: sintering in sintering furnace, cooling, demolding and dismantling the auxiliary glass fiber layer.
Example 4:
the permeation resistant fluoroplastic product is characterized in that at least part of the permeation resistant fluoroplastic product is tubular, the radial cross section of the permeation resistant fluoroplastic product is circular, the permeation resistant fluoroplastic product is sequentially provided with 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 a tubular structure with the circular radial cross section, and each metal rib 8 is spirally and fixedly arranged along the circumference of the tubular structure. The metal ribs 8 which are spirally wound and fixed are in a circular arc convex curve shape on each section, as shown in fig. 6, and form a good supporting effect on adjacent polytetrafluoroethylene by matching with the metal net sleeve 4 on the periphery, so that the metal ribs have strong dent resistance and can still keep the original shape under larger negative pressure.
The anti-permeability fluoroplastic product provided by the embodiment can be used as an anti-corrosion lining for equipment such as a pipeline (straight pipe, bent pipe), a kettle, a tower and the like, the shape of the anti-permeability fluoroplastic product is matched with the shape of the equipment, and the radial cross section of the anti-permeability fluoroplastic product is a circular tubular structure which can be a straight pipe or bent pipe, an equal-diameter pipe or a non-equal-diameter pipe.
Preferably, a section of tubular structure with circular radial section is provided with a metal rib 8 formed by continuously spirally winding a metal wire with a certain diameter, and two axial ends of the metal rib 8 are close to two axial ends of the tubular structure. By "close" is meant here that there is a negligible or no spacing between the same axial positions or directions that does not affect the overall strength, so that the entire section of the tubular structure is protected against negative pressure deformation by the helical metal ribs 8. The tubular structure with a circular radial section can be provided with a plurality of metal wires with certain diameters which are continuously spirally wound to form the metal ribs 8 which are connected end to end, the connection parts are connected in a stamping, welding or winding mode, but the thickness of the connection parts is thicker, and the manufactured permeation resistant fluoroplastic products are unevenly distributed. It is also possible to arrange a plurality of metal ribs 8 formed by continuously spirally winding metal wires with a certain diameter in a tubular structure with a circular radial section from inside to outside in a multi-layer manner, but the bonding degree between materials at two sides of the metal ribs 8 is poor.
The polytetrafluoroethylene inner composite layer 5 and the polytetrafluoroethylene outer composite layer 6 in the permeation resistant fluoroplastic product shown in fig. 5 are respectively formed by sintering a composite material with a certain thickness, wherein the composite material is formed by superposing a polytetrafluoroethylene film layer 3 formed by winding a polytetrafluoroethylene film strip and a fusible polytetrafluoroethylene film layer 4 formed by winding a fusible polytetrafluoroethylene film strip. And the fusible polytetrafluoroethylene film layers 4 of the composite materials with certain thickness are all attached to the metal net sleeve 7 before sintering, so that when sintering, the fusible polytetrafluoroethylene is melted into a flowing shape, flows to grid holes of the polytetrafluoroethylene film layer 3 and the metal net sleeve 7, permeates into gaps of polytetrafluoroethylene materials, fully fills the gaps of the polytetrafluoroethylene materials, and simultaneously forms good combination between the polytetrafluoroethylene inner composite layer 5 and the polytetrafluoroethylene outer composite layer 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, which is formed by interweaving and winding a polytetrafluoroethylene film belt and a fusible polytetrafluoroethylene film belt.
Wherein the bonding layer 9 is formed by composite sintering of a bonding inner layer 10 formed by fusible polytetrafluoroethylene and a bonding outer layer 11 formed by winding glass fibers.
The permeation resistant fluoroplastic article shown in fig. 5 was prepared, taking a thickness specification as an example, by the steps of:
step one: a polytetrafluoroethylene film layer 3 with the thickness of 1.0mm is formed by winding a polytetrafluoroethylene film belt outside a die, steel wires are spirally wound on the polytetrafluoroethylene film layer 3 in a circle-by-circle mode to form metal ribs 8, and gaps are reserved between adjacent circles when the steel wires are wound;
step two: a polytetrafluoroethylene film strip is adopted to wind outside the metal ribs 8 formed in the first step to form a polytetrafluoroethylene film layer 3 with the thickness of 0.5mm, and a fusible polytetrafluoroethylene film strip is adopted to wind outside the polytetrafluoroethylene film layer 3 to form a fusible polytetrafluoroethylene film layer 4 with the thickness of 0.2 mm;
step three: the metal net sleeve 4 which is telescopic in the axial direction is shortened to enable the diameter of the metal net sleeve to be slightly larger than the outer diameter of the fusible polytetrafluoroethylene film layer 4 formed in the second step, the metal net sleeve is conveniently sleeved outside the fusible polytetrafluoroethylene film layer 4, then the two end parts of the metal net sleeve 4 in the axial direction are outwards stretched, and the diameter of the metal net sleeve is reduced in the stretching process until the metal net sleeve 4 is tightly attached to the fusible polytetrafluoroethylene film layer 4;
step four: winding a fusible polytetrafluoroethylene film tape outside the metal net sleeve 4 to form a fusible polytetrafluoroethylene film layer 4 with the thickness of 0.2 mm;
step five: the polytetrafluoroethylene film strip is adopted to form a polytetrafluoroethylene film layer 3 with the thickness of 1.0mm by winding back outside the fusible polytetrafluoroethylene film layer 4 formed in the step four;
step six: forming an adhesive inner layer 10 with the thickness of 0.2mm by adopting a fusible polytetrafluoroethylene film tape to be wound outside the polytetrafluoroethylene film layer 3 formed in the step five;
step seven: wrapping the bonding inner layer 10 formed in the step six by using glass fiber cloth to form a bonding outer layer 11;
step eight: tightly bundling the bonding outer layer 11 formed in the step eight to a glass fiber auxiliary layer with the thickness of 2mm by using a glass fiber belt;
step nine: tightly bundling the bonding outer layer 11 formed in the step eight to a glass fiber auxiliary layer with the thickness of 2mm by using a glass fiber belt;
step ten: sintering in sintering furnace, cooling, demolding and dismantling the auxiliary glass fiber layer.
Example 5:
in the permeation resistant fluoroplastic product, as shown in fig. 7, an adhesive layer 9 is added to the permeation resistant fluoroplastic product provided in example 4, wherein the adhesive layer 9 is formed by compositely sintering an adhesive inner layer 10 formed by fusible polytetrafluoroethylene and an adhesive outer layer 11 formed by winding glass fibers. The preparation of the adhesive layer 9 was the same as in example 3.
Example 6:
a permeation-resistant fluoroplastic lined pipe may be a round straight pipe as shown in fig. 8, and comprises a casing 12 made of metal material such as steel, flanges 13 made of metal material such as steel provided at both ends 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 a permeation-resistant fluoroplastic lined product provided in any one of embodiments 1 to 5, and the portions provided inside the casing 12 are all tubular structures having circular radial cross sections.
When the permeation resistant fluoroplastic lining product without the adhesive layer 9 is used, the outer wall of the permeation resistant fluoroplastic lining product is subjected to sodium treatment, the surface of the round permeation resistant fluoroplastic lining product is coated with an adhesive, then the round permeation resistant fluoroplastic lining product is sleeved into a steel shell, the two ends of the round permeation resistant fluoroplastic lining product are turned over to be flatly attached to the sealing surface of the steel flange 13, and the round permeation resistant fluoroplastic lining product is tightly attached to the inner wall of the steel shell by injecting water or high-pressure gas into the round permeation resistant fluoroplastic lining product after being sealed in a pressurizing mode, for example, until the adhesive is completely cured.
When the anti-permeation fluoroplastic lining product with the adhesive layer 9 is used for preparation, the adhesive is smeared on the outer wall surface of the anti-permeation fluoroplastic lining product, then the anti-permeation fluoroplastic lining product is sleeved into the steel shell, the two ends of the anti-permeation fluoroplastic lining product are turned over to be flatly attached to the sealing surface of the steel flange 13, and the anti-permeation fluoroplastic lining product is tightly attached to the outer wall of the round anti-permeation fluoroplastic product and the inner wall of the steel shell by injecting water or high-pressure gas into the round anti-permeation fluoroplastic product after being sealed in a pressurizing mode, for example, until the adhesive is completely solidified.
Example 7:
a pipe joint with a fluorine plastic liner for preventing permeation is composed of a casing 12 with at least two interfaces, a flange 13 made of metal material, such as steel, and a fluorine plastic liner 14, which is made of metal material and is used for connecting with the end of said interfaces of casing 12, and the fluorine plastic liner 14 is a fluorine plastic liner for preventing permeation, and is prepared from the fluorine plastic liner for preventing permeation according to any one of 1-5, and at least one tubular structure with circular radial cross section is arranged at the inner part of casing 12.
As shown in fig. 9, a 90 ° elbow connector is provided with two connectors on the housing 12, and an elbow structure with circular radial cross section is provided in the connector.
The pipe joint structure of three or more interfaces may be provided, for example, a three-way pipe joint as shown in fig. 10. The tee fitting shown in fig. 10 has a fluoroplastic lining 14 of two tubular structures each having a circular radial cross section connected together.
Example 8:
a container with impervious fluoroplastic lining is composed of a casing 12 with at least one opening made of metal material (e.g. steel), a flange 13 made of metal material (e.g. steel) for connecting cover or pipeline, and a fluoroplastic lining 14 connected to the inner surface of casing 12. Said fluoroplastic lining 14 can be the impervious fluoroplastic lining product as disclosed in any one of embodiments 1-5, and the part of said lining on the inner surface of casing 12 has at least one tubular structure with circular radial cross section. The container can be a common container capable of containing materials, such as a storage tank, a reaction kettle and the like.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.

Claims (6)

1. A permeation resistant fluoroplastic article characterized by: the composite polytetrafluoroethylene barrier layer comprises polytetrafluoroethylene (1) and a barrier layer formed by fusible polytetrafluoroethylene (2) filled between polytetrafluoroethylene;
the polytetrafluoroethylene composite barrier layer is formed by sintering a composite material with a certain thickness, wherein the composite material is formed by interlacing at least one polytetrafluoroethylene film layer (3) formed by winding a polytetrafluoroethylene film belt and at least one fusible polytetrafluoroethylene film layer (4) formed by winding a fusible polytetrafluoroethylene film belt;
the permeation resistant fluoroplastic product further comprises a metal net sleeve (7), wherein grid holes of the metal net sleeve (7) are diamond-shaped, so that the metal net sleeve (7) can deform in a telescopic way along the axial direction, the metal net sleeve (7) is embedded in a polytetrafluoroethylene composite barrier layer, the polytetrafluoroethylene composite barrier layer is divided into a polytetrafluoroethylene inner composite layer (5) and a polytetrafluoroethylene outer composite layer (6) which are positioned in the metal net sleeve (7), and the polytetrafluoroethylene inner composite layer (5) and the polytetrafluoroethylene outer composite layer (6) are connected between the grid holes of the metal net sleeve (7);
the fusible polytetrafluoroethylene film layers (4) of composite materials with certain thickness of the polytetrafluoroethylene inner composite layer (5) and the polytetrafluoroethylene outer composite layer (6) are respectively attached to the metal net sleeve (7) before sintering.
2. The permeation resistant fluoroplastic article according to claim 1, wherein: the metal net sleeve (7) is a tubular metal net sleeve formed by interweaving metal wires with metal wires in a warp-weft mode or a tubular metal net sleeve formed by welding telescopic deformed metal net sheets with rhombic grids in an end-to-end mode.
3. The permeation resistant fluoroplastic article according to claim 1, wherein: the permeation resistant fluoroplastic product is characterized in that at least part of the permeation resistant fluoroplastic product is tubular, the radial sections of the permeation resistant fluoroplastic product are all circular, at least one metal rib (8) is embedded in the polytetrafluoroethylene composite barrier layer in a tubular structure, and each metal rib (8) is spirally and fixedly arranged along the circumference of the tubular structure.
4. The permeation resistant fluoroplastic article according to claim 1, wherein: the polytetrafluoroethylene composite barrier layer is externally provided with an adhesive layer (9), and the adhesive layer (9) is formed by compositely sintering an adhesive inner layer (10) formed by fusible polytetrafluoroethylene and an adhesive outer layer (11) formed by winding glass fibers.
5. A method of making a permeation resistant fluoroplastic article according to any one of claims 1-4, comprising the steps of:
step one: winding a polytetrafluoroethylene film belt and a fusible polytetrafluoroethylene film belt outside a die 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 step one, sleeving the metal net sleeve (7) outside the inner layer formed in the step one, and stretching the two axial ends of the metal net sleeve (7) outwards to enable the metal net sleeve (7) to be tightly attached to the outer layer formed in the step one;
step three: a polytetrafluoroethylene film belt and a fusible polytetrafluoroethylene film belt are wound outside a die to form a composite material with a certain thickness outside the metal net sleeve (7) formed in the second step to serve as an outer layer;
step four: binding and fixing the composite material with a certain thickness by using a glass fiber belt to form a glass fiber auxiliary layer;
step five: sintering in sintering furnace, cooling, demolding and dismantling the auxiliary glass fiber layer.
6. A permeation-resistant corrosion-resistant container apparatus comprising a housing made of a metal material, said housing having attached to an inner surface thereof a fluoroplastic lining, said fluoroplastic lining being a permeation-resistant fluoroplastic article according to any one of claims 1 to 4, said fluoroplastic lining being a thin-walled layer of unitary seamless construction.
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