Polyvinyl alcohol fiber-fluorine polyurethane anti-cavitation paint and preparation method thereof

A polyvinyl alcohol fiber and polyurethane technology, applied in polyurea/polyurethane coatings, fiber types, anti-corrosion coatings, etc., can solve the problems of material strength decline, threat to equipment operation safety, and failure to reach service life, etc., to achieve increased strength, Good anti-cavitation performance, easy production effect

Active Publication Date: 2017-06-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The characteristic of cavitation is that the metal surface is partially eroded into contiguous honeycomb-shaped holes, or even into a sponge state, resulting in a sharp drop in material strength, failing to reach the expected service life, and seriously threatening the operation safety of the equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of component A of the paint: Dry the fluorine-containing polyether diol with a molecular weight of 1000, defoamer, leveling agent, adhesion promoter, and thickener in a vacuum oven at 60°C for 24 hours to remove The water should be sealed and stored, and the toluene should be refluxed with metal sodium to remove water and then stored in a sealed environment. Under the protection of dry high-purity nitrogen, add 100 grams of fluorine-containing polyether diols, 0.5 grams of defoamers, 0.5 grams of leveling agents, 1 grams of adhesion promoters, 3 grams of thickeners, and 120 grams of toluene After stirring evenly in an anhydrous airtight container with a stirring device, obtain the component A of the coating, and pour it into a dry airtight storage tank for storage; the preparation method of the component B of the coating: in a vacuum oven at 80 ℃ mm, tensile strength 1GPa, elastic modulus 30GPa, elongation at break 6% of the polyvinyl alcohol fibe...

Embodiment 2

[0040]Preparation method of component A of the coating: Dry the fluorine-containing polyether tetraol with a molecular weight of 500, defoamer, and leveling agent in a vacuum oven at 40°C for 48 hours to remove moisture and seal them for storage. Under the protection of dry high-purity nitrogen, add 100 grams of fluorine-containing polyether tetraol, 0.25 grams of defoamer, and 0.25 grams of leveling agent into an anhydrous airtight container with a stirring device and stir evenly to obtain coating A Components are stored in a dry airtight storage tank; the preparation method of component B of the coating: in a vacuum oven at 80 ° C Dry the polyvinyl alcohol fiber for 24 hours to remove moisture and seal it for storage. Under the condition of dry high-purity nitrogen protection, add 100 grams of high-strength and high-modulus polyvinyl alcohol fiber and 300 grams of hexamethylene diisocyanate trimer into an anhydrous After stirring evenly in a closed container, react at 150°C ...

Embodiment 3

[0043] Preparation method of coating component A: Dry the side chain fluorine-containing polyether polyol with a molecular weight of 3000, defoamer, leveling agent, adhesion promoter, and thickener in a vacuum oven at 50°C for 48 hours Remove moisture and keep sealed. Xylene is refluxed with sodium metal to remove water and then stored sealed. Under the protection of dry high-purity argon, 100 grams of side chain fluorine-containing polyether polyols, 0.25 grams of defoamers, 0.25 grams of leveling agents, 0.25 grams of adhesion promoters, 0.25 grams of thickeners, 100 grams of Add xylene into an anhydrous airtight container with a stirring device and stir evenly to obtain component A of the coating, which is poured into a dry airtight storage tank for storage; the preparation method of component B of the coating: put 15 μm in diameter in a vacuum oven at 60°C , polyvinyl alcohol fibers with a length of 4mm, a tensile strength of 3GPa, an elastic modulus of 38GPa, and a breaki...

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Abstract

The invention belongs to the technical field of paints, and relates to a polyvinyl alcohol fiber-fluorine polyurethane anti-cavitation paint and a preparation method thereof. The film forming material of the paint is fluorine-containing polyurethane, and has the advantages of high adhesive force, high toughness, weather resistance, chemical mediator resistance, temperature resistance, low surface energy, low friction property and the like. By adding the high-strength high-modulus polyvinyl alcohol fiber as the filler, the paint has the advantages of very high tensile strength and modulus, acid/alkali resistance, aging resistance, corrosion resistance, weather resistance and the like; and the effective combination of the filler and the paint film forming material can further enhance the properties of the coating. The isocyanate-grafted high-strength high-modulus polyvinyl alcohol fiber, which is prepared by carrying out grafting reaction on the hydroxyls on the surface of the high-strength high-modulus polyvinyl alcohol fiber and isocyanates, is used as the filler. The anti-cavitation coating prepared by applying the paint at normal temperature has the characteristics of easy production, simple application, light weight, erosion resistance, corrosion resistance and the like, and is mainly used for protecting propellers, pumps, valves, pipelines and the like in a cavitation environment.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a polyvinyl alcohol fiber-fluoropolyurethane anti-cavitation coating and a preparation method thereof. Background technique [0002] Cavitation erosion, also known as cavitation erosion, is a phenomenon in which cave-like corrosion damage occurs on the metal surface in contact with the fluid under the condition of high-speed flow and pressure change. It often occurs in the high-speed decompression area of ​​the high-speed rotating blade in the fluid, where cavitation is formed, and the cavitation is crushed in the high-pressure area to generate impact pressure, destroy the metal surface and its protective film, and accelerate the corrosion rate. The characteristic of cavitation erosion is that the metal surface is partially eroded into contiguous honeycomb-shaped holes, or even into a sponge state, resulting in a sharp drop in material strength, failing to reach the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D175/04C09D129/04C09D5/08D06M13/395D06M101/24
CPCC08L2205/16C08L2312/00C09D5/08C09D175/04C09D175/08D06M13/395D06M2101/24C08L29/04
Inventor 吴航朱圣龙王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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