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Anti-cavitation erosion polyurethane elastic layer and preparation method thereof

A polyurethane elasticity and cavitation technology, applied in the field of elastic layers, can solve the problems of material performance decline, corrosion resistance, shortened service life, etc., and achieve the effects of good tensile performance, good environmental resistance, and adjustable hardness

Inactive Publication Date: 2019-08-30
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Cavitation erosion is referred to as cavitation erosion, also known as cavitation erosion. Cavitation erosion will cause the surface of the material to be partially eroded into contiguous honeycomb-shaped holes, resulting in a sharp decline in material performance and greatly shortening the service life.
The harm of cavitation can be effectively reduced by using an anti-cavitation layer. The current anti-cavitation layer is mainly a high-strength metal coating, such as AISI316, 0Cr13Ni5Mo, CrMnN stainless steel, Ni-Ti alloy, 20SiMn low alloy steel, etc., but The metal alloy layer usually has the disadvantages of high quality, low corrosion resistance, and high price

Method used

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  • Anti-cavitation erosion polyurethane elastic layer and preparation method thereof
  • Anti-cavitation erosion polyurethane elastic layer and preparation method thereof

Examples

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Effect test

preparation example Construction

[0024] The preparation method of the anti-cavitation polyurethane elastic layer of the present invention, wherein

[0025] Step 1: Under the condition of dry inert gas protection, add isocyanate and polyether polyol into an anhydrous airtight container with stirring device, heat and stir under vacuum for a period of time to make it evenly mixed, then further increase the temperature to make the mixture fully React to obtain the prepolymer, that is, component A, and pour it into a dry airtight storage tank for storage

[0026] Step 2: Pour components A and B into a beaker, stir evenly, perform defoaming treatment, and then pour into corresponding molds.

[0027] Step 3: After curing at 80° C. for a period of time, continue curing at room temperature for more than 7 days, so as to obtain a polyurethane coating.

Embodiment 1

[0029] The polyisocyanate in component A is MDI-100, which should be heated to 60°C before use to liquefy it. Weigh 106g and pour it into a 500ml three-necked flask; the polyether polyol should be PPG-1000, which needs to be vacuum removed at 120°C before use. Water 3h, the weighed quality is 173g. Pour it into a three-necked flask and mix it with MDI. Under a nitrogen atmosphere, mechanically stir at 50°C for 1h (380r / min), then raise the temperature to 80°C for 2h rapid reaction to obtain a prepolymer, which is sealed and dried.

[0030] The cross-linking agent of component B is 1,4 butanediol, the cross-linking agent is 330N, and the defoaming agent is 530N. Weigh 120g of prepolymer, 8.9g of 1,4 butanediol, 21g of 330N polyether, and 1.5g of 530N defoamer. Add to a 250ml beaker in sequence, stir mechanically for 2 minutes, vacuumize and defoam in a vacuum box for 25 minutes, pour it into a mold, continue defoaming for 20 minutes, then cure on a heating plate at 80°C for 1...

Embodiment 2

[0032] The polyisocyanate of component A is MDI-50, which should be heated to 50°C to enhance its fluidity before use. Weigh 50g and pour it into a 500ml three-necked flask; Water for 3 hours, the weighed mass is 200g. Pour it into a three-necked flask and mix it with MDI. Under a nitrogen atmosphere, stir mechanically at 50°C for 1h (340r / min), then raise the temperature to 80°C for 2h to obtain a prepolymer, which is sealed and dried.

[0033] The cross-linking agent of component B is 1,4 butanediol, the cross-linking agent is TEA, and the defoaming agent is 530N. Weigh 120g of prepolymer, 2.06g of 1,4 butanediol, 2.27g of TEA, and 1.20g of 530N defoamer. Add to a 250ml beaker one by one, mechanically stir for 2 minutes, vacuumize and defoam in a vacuum box for 10 minutes, pour into a mold, continue defoaming for 15 minutes, cure on a heating plate at 80°C for 12 hours, and finally place it at room temperature for 7 days to complete curing .

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Abstract

The invention discloses an anti-cavitation erosion polyurethane elastic layer and a preparation method thereof. Raw materials comprise the following components in parts by mass: 100 parts of isocyanate, 150-400 parts of polyether polyol, 4-50 parts of a cross-linking agent, 3-8 parts of a chain extender and 1-5 parts of a defoaming agent; the isocyanate has two isocyanate functional groups; the main chain of the polyether polyol has two hydroxyl functional groups; the cross-linking agent is a monomer or polymer with three hydroxyl functional groups; the isocyanate is diphenylmethane diisocyanate, toluene diisocynate or isophorone diisocyanate; and the polyether polyol is polytetrahydrofuran glycol, polypropylene glycol or polypropylene glycol. The anti-cavitation erosion polyurethane elastic layer has the characteristics of adjustable hardness, impact resistance, good tensile property, good environmental resistance and the like, and cavitation erosion resistance is superior to cavitation erosion resistance of composite material plate MFC-50 and 316L stainless steel according to a cavitation vibration test.

Description

technical field [0001] The invention relates to an elastic layer and a preparation method thereof, in particular to an anti-cavitation polyurethane elastic layer and a preparation method thereof, belonging to the technical field of elastic layers. Background technique [0002] Cavitation erosion is referred to as cavitation erosion, also known as cavitation erosion. Cavitation erosion will cause the surface of the material to be partially eroded into contiguous honeycomb-shaped holes, resulting in a sharp decline in material performance and greatly shortening the service life. The harm of cavitation can be effectively reduced by using an anti-cavitation layer. The current anti-cavitation layer is mainly a high-strength metal coating, such as AISI316, 0Cr13Ni5Mo, CrMnN stainless steel, Ni-Ti alloy, 20SiMn low alloy steel, etc., but The metal alloy layer usually has the disadvantages of high quality, low corrosion resistance, and high price Contents of the invention [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/32
CPCC08G18/48C08G18/4804C08G18/6674C08G18/6688
Inventor 张智嘉魏浩梅汇锋和卫平魏建辉李瑞高闪欧阳肖王国军马宁张馨月王强
Owner HARBIN ENG UNIV
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