CN113561577A

CN113561577A - ECTFE and FRP composite board

Info

Publication number: CN113561577A
Application number: CN202110731372.1A
Authority: CN
Inventors: 奚儒伟
Original assignee: Shanghai Yizhi Industrial Ltd By Share Ltd
Current assignee: Shanghai Yizhi Industrial Ltd By Share Ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-10-29
Anticipated expiration: 2041-06-30
Also published as: CN113561577B

Abstract

The invention discloses an ECTFE and FRP composite board, wherein a hot-pressing implantation process is adopted on the ECTFE surface, fibers are implanted into the surface of the board to realize the mechanical connection between the board and the fibers, and the exposed part of the fibers are connected with reinforced glass fiber reinforced plastics through resin adhesive bonding. Forming a multilayer composite structure plate with an ECTFE layer, a fiber insertion layer, a fiber cementing layer, an FRP layer and a gel coat layer. The application integrates the characteristics of two materials, and has excellent corrosion resistance of ECTFE and high mechanical property of FRP materials.

Description

ECTFE and FRP composite board

Technical Field

The present invention relates to a layered composite material.

Background

In many processes in the chemical industry, the medium is highly corrosive, especially in an acid-base alternating environment. Therefore, many chemical tank type and container type equipment cannot meet the requirement of related service life due to local corrosion or performance reduction. The production cost of enterprises is improved, and the stable operation of the enterprises is not facilitated.

The ECTFE belongs to fluoroplastic products, has excellent corrosion resistance, and also has excellent corrosion resistance even in an acid-base alternating environment; meanwhile, the ECTFE has extremely low water vapor permeability, and can meet the requirements of corrosion resistance and leakage resistance of equipment by using smaller thickness. However, ECTFE has the disadvantage of fluorine-based materials while having excellent properties: expensive, poor in forming manufacturability and poor in mechanical property, is a non-polar material, and is almost impossible to bond other materials by a chemical method. It is not economical if it is used simply as a structural material in a highly corrosive environment.

Disclosure of Invention

The purpose of the invention is as follows:

the ECTFE and FRP composite board has the advantages of lower outer layer cost, good inner layer corrosion resistance and firm bonding.

The technical scheme is as follows:

according to the ECTFE and FRP composite board, the hot-pressing implantation process is adopted on the surface of ECTFE (copolymer of ethylene and trifluoroethylene), fibers are basically and uniformly implanted on the surface of the board with molten surface, the mechanical connection between the board and the fibers is realized, and the exposed fibers can be well connected with reinforced glass fiber reinforced plastics through resin bonding. Forming a multilayer composite structure plate with an ECTFE layer, a fiber insertion layer, a fiber cementing layer, an FRP layer and a gel coat layer. The problem of low shearing strength of the interface of the non-polar plastic and the glass fiber reinforced plastic is solved, and the advantages of the two materials are combined.

The implant fiber is glass fiber, carbon fiber, cotton-flax fiber with melting point higher than ECTFE, and non-low-melting-point polymer fiber. Glass fiber or high-melting-point polymer fiber is preferred, and the glass fiber or the high-melting-point polymer fiber is easy to be inserted into the molten ECTFE surface, cooled and condensed, and is easy to be bonded with resin adhesive for FRP; the fiber can be soaked by a nonpolar solvent such as CCl4 or a KH560 silane coupling agent with a higher boiling point, so that the affinity of the fiber with a nonpolar ECTFE material is improved. Further preferred is a method in which one end of a glass fiber or a high-melting-point high-molecular fiber (e.g., a polyimide fiber) is subjected to heat-shrinking treatment by local heating above the respective melting points, so that the diameter of the fiber at the end is increased, and the fiber is inserted into the molten ECTFE surface and is anchored therein after being condensed, thereby increasing the strength of the connection. Even a pinhole (e.g. by laser perforation) may be machined at the end of the fiber with the larger diameter, so that after the molten ECTFE surface (the melting temperature is higher than the melting point of ECTFE, lower than the melting point of glass fiber or high-melting-point high-molecular fiber, so that the implanted fiber will not melt when the ECTFE surface is molten, and the shape or pinhole structure of the butt end is maintained), the melt-solidified ECTFE will form a filament to pass through the pinhole and be connected with other parts into a whole, and when the ECTFE is solidified, the implanted fiber and the ECTFE filament are mutually drawn, and the combination of anchoring and filament drawing is realized, so that the combination of the implanted fiber and the ECTFE is firmer, and the implanted fiber and the ECTFE will not be peeled off unless the structure is damaged.

In the project, an ECTFE composite FRP new technology is developed, a hot-pressing implantation process is adopted, fibers are uniformly implanted into the surface of a molten ECTFE plate by about 0.5-1MM, and the fibers are exposed by 0.5-2 MM; and then coating resin adhesive, then jointing the FRP plates, and finally hot-pressing and compounding the FRP plates together through a laminating machine to realize the mechanical connection of the plates and the fibers. The implanted fibers can be well connected with the ECTFE, and the exposed fibers can be well connected with the reinforced glass fiber reinforced plastics. The problem of low shearing strength of the non-polar plastic and glass fiber reinforced plastic interface is solved. Meanwhile, the composite board is changed into a novel technology for designing and manufacturing chemical equipment with strong corrosion chemical environment (particularly corrosive substances contacted with the ECTFE surface) such as acid-base alternation, the reliability and the service life of the equipment in chemical production are improved, and a new choice is provided for the implementation of energy conservation and emission reduction of chemical enterprises.

In the application, the thickness of the ECTFE sheet is preferably 1-3mm (relatively economic), the fiber insertion layer is preferably 0.5-1mm, the fiber adhesive layer is preferably 0.5-2mm, and the FRP layer is preferably 2-10mm (relatively good in mechanical strength).

When the fiber is glass fiber, the glue resin adopts resin glue (such as unsaturated polyester resin or epoxy resin) which is the same as that of the FRP matrix, the fiber glue layer and the FRP layer (a composite interface can be subjected to frosting treatment firstly, so that part of the fiber in the FRP layer is exposed, and is contacted, crossed and mutually permeated with the implanted glass fiber, and the stripping force after the resin bonding is further improved) are compounded into one layer with the same material, and the section of the whole plate is of a three-layer structure. The material of the plate has basically consistent expansion with heat and contraction with cold, and is stable and good when used in an environment with larger temperature change and not easy to delaminate.

Has the advantages that:

the novel ECTFE composite FRP composite material provided by the application integrates the characteristics of two materials, particularly ECTFE, has excellent corrosion resistance, and also has good corrosion resistance even in an acid-base alternating high-temperature environment; the ECTFE has extremely low water vapor permeability, so that the corrosion resistance and impermeability of equipment can be met by using the minimum thickness, and the problem of material economy is solved. Therefore, the special composite technology is planned to combine the excellent chemical resistance and excellent medium permeation resistance of the ECTFE with the characteristics of high mechanical property, mature forming process and good price of the FRP material.

Drawings

FIG. 1 is a schematic cross-sectional view of the present application;

in the figure, the thicker ends of the 1-ECTFE layer (containing the fiber insertion layer), the 2-fiber cementing layer, the 3-FRP layer, the 4-gel coat layer, the 20-implantation fiber and the 21-implantation fiber.

Detailed Description

Example 1:

the ECTFE/FRP composite board shown in figure 1 is a four-layer composite structure board formed by an ECTFE layer (containing a fiber insertion layer), a fiber cementing layer, an FRP layer and a gel coat layer.

The implanted fiber is a polymer fiber with a melting point higher than that of ECTFE, one end of the polymer fiber with a high melting point is subjected to heat shrinkage treatment by local heating higher than the respective melting point, so that the diameter of the fiber at the end is enlarged and thickened, and then the fiber is inserted into the surface of the ECTFE which is molten and is subjected to condensation anchoring.

The thickness of the ECTFE board is 1-3mm, the thickness of the fiber insertion layer is 0.5-1mm, the thickness of the fiber cementing layer is 0.5-2mm, and the thickness of the FRP layer is 2-10 mm.

Example 2:

the ECTFE/FRP composite board forms a three-layer composite structure board of an ECTFE layer, a fiber insertion layer, a fiber cementing layer and an FRP layer.

The implanted fiber is glass fiber with a melting point higher than that of ECTFE, one end of the glass fiber is subjected to heat shrinkage treatment by local heating at high temperature, so that the diameter of the fiber at the end is enlarged and thickened, and then the glass fiber is inserted into the surface of the ECTFE which is melted and is subjected to condensation anchoring.

The resin matrix in the fiber cementing layer is basically the same as the matrix material of the FRP.

The thickness of the ECTFE sheet is 2-3mm, the thickness of the fiber insertion layer is 0.5-1mm, and the fiber adhesive layer and the FRP layer together form a thicker FRP layer with similar components.

Claims

1. An ECTFE and FRP composite board, which is characterized in that: the surface of the ECTFE plate is implanted with fibers, and the exposed part of the fibers is connected with the glass fiber reinforced plastic plate through resin adhesive bonding to form a four-layer composite structure plate with an ECTFE layer, a fiber adhesive bonding layer, an FRP layer and a gel coat layer, wherein the ECTFE layer contains a fiber insertion layer at a composite interface.

2. The ECTFE and FRP composite panel as defined in claim 1, wherein: the fiber is implanted into the surface of the fused ECTFE sheet material by about 0.5-1MM, and the fiber is exposed by 0.5-2 MM.

3. The ECTFE and FRP composite panel as defined in claim 1, wherein: the implanted fiber is glass fiber or polymer fiber with melting point higher than that of ECTFE.

4. The ECTFE and FRP composite panel as defined in claim 3, wherein: one end of the glass fiber or the high-melting-point high-molecular fiber is first subjected to a heat-shrinking treatment by local heating above the respective melting points so that the fiber diameter of the end becomes large, and then inserted into the molten ECTFE surface and condensation-anchored therein.

5. The ECTFE and FRP composite board as claimed in claim 4, wherein: a pinhole is machined into the end of the fiber with the larger diameter so that after the end is implanted into the molten ECTFE surface, the ECTFE filament will pass through the pinhole so that the implanted fiber and ECTFE filament are drawn toward each other.