Waterproof polyurea coating and preparation method thereof

A waterproof coating and polyurea technology, applied in the field of coatings, can solve the problems of coating aging resistance reduction, chemical instability, and aging resistance performance to be further improved, so as to increase stain resistance, corrosion resistance and aging resistance , to overcome the effect of easy aging

Active Publication Date: 2015-12-23
上海恩缔实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the decomposition of aromatic compounds under the action of ultraviolet rays, they are chemically unstable, which reduces the aging resistance of coatings
In the prior art, the Chinese patent document with the application publication number CN101531861A discloses a two-component spray polyurea waterproof coating, which uses aliphatic spray polyurea elastomer as a raw material to improve the aging resistance of coating products, but does not fundamentally To solve the aging effect of ultraviolet rays on polyurea coatings, its aging resistance needs to be further improved

Method used

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  • Waterproof polyurea coating and preparation method thereof

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preparation example Construction

[0048] Correspondingly, the present invention also provides a preparation method of a polyurea waterproof coating, which comprises the following steps in parts by mass: placing 30-40 parts of polyether polyol and 5-10 parts of solvent in the first reaction kettle, While stirring, heat up to 125°C, pass in nitrogen for atmosphere protection, dehydrate under reduced pressure for 3 hours, cool down to 80°C, then add 50-65 parts of 3,3-dimethyl-4,4-dicyclohexylmethane diisocyanate, stir After uniform reaction for 3 hours, component A is obtained; 40-50 parts of amino polyether, 30-40 parts of amine chain extender, and 10-15 parts of plasticizer are placed in the second reaction kettle, and the atmosphere is protected by nitrogen gas , dehydration under reduced pressure at 120° C. for 3 hours, and then add 5-10 parts of silane-modified nano lithopone into the second reaction kettle and stir evenly at high speed to obtain component B.

[0049] As a preferred option, the amine chain ...

Embodiment 1

[0059] First prepare an aqueous ethanol solution with a volume ratio of 1:1, adjust the pH value to 4.0 with 0.1M hydrochloric acid solution, disperse the nano-lithopone in the above solution, and stir at a speed of 500r / min in a water bath at 40°C. Add acryloyloxyhexadecyldiethoxysilane drop by drop, continue to stir for 3 hours after completion, and finally filter, wash, fully dry at 80°C, and pulverize to obtain silane-modified lithopone. The particle size composition of the lithopone satisfies that the D90 is less than 50nm, and the whiteness is greater than 90%.

Embodiment 2

[0061] (1) According to the mass ratio, weigh 40 parts of pentaerythritol polyether and 10 parts of vinyl polydimethylsiloxane in the reaction kettle, raise the temperature to 125 ° C under stirring, and at the same time pass nitrogen gas for atmosphere protection , dehydrating the above material under reduced pressure for 3 hours, after the completion, lower the temperature to 80°C, then add 50 parts of 3,3-dimethyl-4,4-dicyclohexylmethane diisocyanate, stir evenly and keep the reaction for 3 hours to obtain A component.

[0062] (2), according to the mass ratio, weigh 40 parts of diaminodiphenyl ether, 40 parts of 2,5-diamino-1,3,3-trimethylcyclohexylmethylamine, 10 parts of dipropylene glycol dibenzoate In another reactor, blow nitrogen to protect and dehydrate under reduced pressure at 120°C for 3 hours, then add 10 parts of the silane-modified lithopone prepared in Example 1 and stir evenly in the reactor at high speed to obtain component B.

[0063] (3) Use component A ...

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Abstract

The invention provides a waterproof polyurea coating and a preparation method thereof. The waterproof polyurea coating comprises a component A and a component B, wherein the component A comprises 3,3-dimethyl- 4,4-diisocyanatodicyclohexylmethane, polyether glycol and a solvent; and the component B comprises aminopolyether, an amine chain extender, a plasticizer and silane-modified nanometer lithopone. According to the waterproof polyurea coating, 3,3-dimethyl-4,4-diisocyanatodicyclohexylmethane is used as the raw material, so that the light stability and weather resistance of the waterproof polyurea coating are improved, the problem that a coating prepared by taking an aromatic compound as a raw material is easily aged is solved, the coating is kept to have long enough gelling time and curing time, and the coating is relatively good in permeation and combination with a substrate. The silane-modified nanometer lithopone is adopted, so that the corrosion resistance and ageing resistance of the coating are improved; and ultraviolet is effectively absorbed, and a photocatalytic reaction is carried out, so that the coating has antibacterial property, and the pollution resistibility of the coating is improved.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a polyurea waterproof coating and a preparation method thereof. Background technique [0002] Spraying polyurea elastomer technology is a new type of solvent-free, The pollution-free green construction technology has good application prospects in anti-corrosion, waterproof, wear-resistant and other projects. [0003] Two-component spray polyurea waterproof coating is an elastomeric material produced by the reaction of isocyanate components and amine compounds. Isocyanate can be either aromatic or aliphatic. For two-component spray polyurea waterproof coatings, the first component is monomers, polymers, isocyanate derivatives, prepolymers and semi-prepolymers, and the prepolymers and semi-prepolymers are composed of amino-terminated or The hydroxyl compound is prepared by reacting with isocyanate, and the said hydroxyl compound usually adopts oligomer dihydric alcohol, trihydri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/02C09D7/12C09D5/08C09D5/16C08G18/75C08G18/66C08G18/48C08G18/50C08G18/32
CPCC08G18/758C08K9/06C08K2003/3036C08K2003/3045C08K2201/011C09D5/08C09D5/1687C09D175/02
Inventor 张洲会林德
Owner 上海恩缔实业有限公司
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