A kind of polyvinyl alcohol fiber-fluoropolyurethane anti-cavitation coating and preparation method thereof

A polyvinyl alcohol fiber and polyurethane technology, which is used in polyurea/polyurethane coatings, fiber treatment, anti-corrosion coatings, etc., can solve the problems of not reaching the service life, threatening the safety of equipment operation, and reducing the strength of materials, achieving easy production, Good cavitation resistance and strength enhancement effect

Active Publication Date: 2019-05-10
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 the coating component A: dry the fluorine-containing polyether glycol with a molecular weight of 1000, defoamer, leveling agent, adhesion promoter, and thickener for 24 hours in a vacuum oven at 60°C. Store in water tightly, toluene is refluxed with sodium metal to remove water and stored in tightly sealed. Under the protection of dry high-purity nitrogen, add 100 grams of fluorine-containing polyether glycol, 0.5 grams of defoamer, 0.5 grams of leveling agent, 1 grams of adhesion promoter, 3 grams of thickener, and 120 grams of toluene into After mixing uniformly in an anhydrous airtight container with a stirring device, the paint component A is obtained, and it is poured into a dry airtight storage tank for storage; the preparation method of the paint component B: in a vacuum oven at 80℃, the diameter is 1μm and the length is 0.2 mm, tensile strength 1GPa, elastic modulus 30GPa, 6% breaking elongation of polyvinyl alcohol fiber dried for 24 ho...

Embodiment 2

[0040] The preparation method of the coating component A: respectively dry the fluorine-containing polyether tetraol with a molecular weight of 500, the defoamer, and the leveling agent in a vacuum oven at 40°C for 48 hours to remove moisture and seal for storage. Under the protection of dry and 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 paint A The components are poured into a dry airtight storage tank for storage; the preparation method of the coating component B: in a vacuum oven at 80℃, the diameter is 20μm, the length is 20mm, the tensile strength is 5GPa, the elastic modulus is 35GPa, and the elongation at break is 8%. The polyvinyl alcohol fiber is dried for 24 hours to remove moisture and sealed and stored. Under the protection of dry high-purity nitrogen, 100 grams of strength and high modulus p...

Embodiment 3

[0043] The preparation method of the coating component A: dry the side chain fluorine-containing polyether polyol with molecular weight of 3000, defoamer, leveling agent, adhesion promoter, and thickener for 48 hours in a vacuum oven at 50°C. Remove the moisture and store it in a sealed container, and store the xylene in a sealed container after refluxing with sodium metal to remove water. Under the protection of dry high-purity argon, 100 grams of side-chain fluorinated polyether polyol, 0.25 grams of defoamer, 0.25 grams of leveling agent, 0.25 grams of adhesion promoter, 0.25 grams of thickener, 100 grams Xylene is added to an anhydrous airtight container with a stirring device and stirred evenly to obtain paint component A, which is poured into a dry airtight storage tank for storage; the preparation method of paint component B: the diameter of 15μm in a vacuum oven at 60℃ , The polyvinyl alcohol fiber with a length of 4mm, tensile strength of 3GPa, elastic modulus of 38GPa...

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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 specifically 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 cavernous corrosion damage occurs on the metal surface in contact with the fluid under the conditions of high-speed flow and pressure changes. It often occurs in the high-speed decompression zone of the high-speed rotating blade in the fluid, where cavitation is formed. The cavitation is crushed in the high-pressure zone and produces impact pressure, destroying the metal surface and its protective film, and accelerating 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, causing a sharp decline in the strength of the material, failing to reach...

Claims

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Application Information

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Patent Type & Authority Patents(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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