Polyurea coating, preparation method and application thereof, and polyurea coating layer

A polyurea and coating technology, applied in the field of coatings, can solve the problem that the anti-corrosion performance of polyurea coatings cannot meet people's needs, etc., and achieve the effect of good anti-corrosion performance.

Active Publication Date: 2018-09-21
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the salt spray resistance of commonly used polyurea coatings is generally ≤800h,

Method used

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  • Polyurea coating, preparation method and application thereof, and polyurea coating layer

Examples

Experimental program
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preparation example Construction

[0037] In the present invention, the preparation method of the A component preferably comprises: polymerizing diisocyanate and polypropylene glycol under nitrogen protection to obtain the A component.

[0038] In the present invention, the diisocyanate and polypropylene glycol are preferably mixed under nitrogen protection to obtain a mixed material.

[0039] In the present invention, the mass ratio of the diisocyanate to polypropylene glycol is preferably 1:1-4, more preferably 1:1.5-3.5, more preferably 1:2-3.

[0040] In the present invention, the diisocyanate preferably includes 2,4'-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate; the 2,4'-diphenylmethane diisocyanate and 4 , The mass ratio of 4'-diphenylmethane diisocyanate is preferably 1:0.5-1.5. In the present invention, the number average molecular weight of the polypropylene glycol is preferably 2000-3000, more preferably 2200-2800, more preferably 2400-2600.

[0041] In the present invention, t...

Embodiment 1

[0092] Prepare 40 parts of MDI-50 (a mixture of 2,4'-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate with a mass ratio of 1:1) and 60 parts of PPG-2000 in high-purity nitrogen Mix the two in a high-speed stirrer under protection at a stirring speed of 400r / min, and heat-preserve and polymerize for 3 hours at 65°C to obtain component A;

[0093] According to the total mass of polyoxypropylene diamine and diethyl maleate accounts for 96% of the total mass of component B raw materials, experiment is carried out, wherein polyoxypropylene diamine is 80 parts by mass, diethyl maleate is 30 parts by mass, Mix the two in a high-speed stirrer under the condition of high-purity nitrogen protection at a stirring speed of 400r / min, and add dispersant TEGODispers 757W, acrylate leveling agent and polydimethylsiloxane defoamer in sequence, and heat up React at 75°C for 20 hours, cool down and discharge to obtain component B; the dispersant accounts for 1% of the total mas...

Embodiment 2

[0097] Prepare 40 parts of MDI-50 (a mixture of 2,4'-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate with a mass ratio of 1:1.5) and 40 parts of PPG-2000, in high-purity nitrogen Mix the two in a high-speed stirrer under protection at a stirring speed of 500r / min, and keep warm at 60°C for 4 hours to obtain component A;

[0098] Experiments were carried out according to the total mass of polyoxypropylene diamine and diethyl maleate accounting for 90% of the total mass of component B raw materials, wherein polyoxypropylene diamine was 60 parts by mass and diethyl maleate was 20 parts by mass , mix the two in a high-speed stirrer at a stirring speed of 500r / min under the protection of high-purity nitrogen, and add dispersant TEGODispers 757W, acrylate leveling agent and polydimethylsiloxane defoamer in sequence, Raise the temperature to 70°C for 18 hours, cool down and discharge to obtain component B; the dispersant accounts for 2% of the total mass of the raw...

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Abstract

The invention provides a polyurea coating, a preparation method and the application thereof, and a polyurea coating layer. The polyurea coating provided by the invention comprises the following components: a component A, a component B and a nano slurry; the component A is prepared from raw materials including diisocyanate and polypropylene glycol; the component B comprises polyoxypropylene diammonium, diethyl maleate, a dispersant, a leveling agent and a defoaming agent; the nano slurry comprises nano silicon dioxide and an accelerator; the mass ratio of the component A to the component B is 1to 1-4; and the mass ratio of the component B to the nano slurry is 1 to 2.5-6%. The polyurea coating and the polyurea coating layer provided by the invention have good wear resistance, adhesive force, 60-degree gloss, flexibility, salt fog resistance and artificial accelerated aging performance, wherein the salt fog resistance is more than or equal to 1000h.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a polyurea coating and a preparation method thereof, a polyurea coating and an application thereof. Background technique [0002] Polyurea coating is a two-component coating, in which component A is a semi-prepolymer prepared by reacting a hydroxyl-terminated compound with a diisocyanate; component B is a mixture of an amino-terminated resin and an amino-terminated chain extender. Polyurea coating is a new type of environmentally friendly coating that does not contain any volatile organic compounds. It is widely used in metal anti-corrosion fields such as oil pipelines, bridge engineering, ship protection, and marine facilities. [0003] In the prior art, the salt spray resistance of commonly used polyurea coatings is generally ≤800h, but the anti-corrosion performance of the polyurea coatings in the prior art still cannot meet people's needs. Contents of the invention [0004] The inv...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D7/61C08G18/76C08G18/50C08G18/48C08G18/10
CPCC08G18/10C08G18/4825C08G18/7671C08K2201/011C09D7/61C09D7/67C09D175/08C08G18/5021C08L83/04C08K3/36
Inventor 钟庆东陈串罗均鲁雄刚孙中渠蒲华燕汪小帆彭艳谢少荣
Owner SHANGHAI UNIV
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