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Single-component poly-ureide waterproof paint and preparation method thereof

A technology for waterproof coatings and polyurea, applied in the direction of polyurea/polyurethane coatings, coatings, etc., which can solve the problems of strong taste, high reactivity of isocyanate groups, sensitive to water vapor and easy to generate bubbles, etc.

Inactive Publication Date: 2019-04-26
BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a single-component polyurea waterproof coating to solve the problem of high reactivity of isocyanate groups in polyurethane prepolymers, sensitivity to water vapor and easy generation of bubbles, high residual toxicity of free isocyanate monomers, and the price of latent curing agents. Problems such as high and strong taste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0046] Another aspect of the present invention provides the preparation method of above-mentioned one-component polyurea waterproof coating, and this preparation method comprises:

[0047] (1) Mixing polymers containing at least two acidic functional groups, pigments and optional plasticizers uniformly, heating up, adding fillers, mixing uniformly, and vacuum dehydration;

[0048] (2) then lower the temperature, mix the mixture obtained in step (1) and polycarbodiimide evenly, and discharge in a vacuum to obtain the one-component polyureide waterproof coating;

[0049] Optionally lower the temperature again, mix at least one of the latent curing agent, catalyst, solvent and auxiliary agent with the mixture obtained in step (2), and discharge in a vacuum to obtain the one-component polyureide waterproof coating.

[0050] According to the present invention, preferably, in step (1), the temperature is raised to 90-110°C;

[0051] In step (2), the temperature is lowered to 60-80°...

Embodiment 1

[0056] Weigh 10 parts by mass of polymers containing at least two acidic functional groups, 3 parts of plasticizer diisononyl phthalate (DINP), 0.5 parts of pigment, add to the reaction kettle, heat up to 100 ° C, and stir Add 50 parts of calcium carbonate at the same time, and vacuum dehydrate for 3 hours. Cool down to 60°C, add 13.5 parts of polycarbodiimide curing agent, and stir at high speed for 2 hours. Then the temperature was lowered to 50° C., 0.3 parts of antifoaming agent and 0.5 parts of methyltetrahydrophthalic anhydride were added, and stirring was continued for 1 hour. Vacuum discharge to obtain a one-component polyurea waterproof coating.

[0057] Wherein, the polycarbodiimide is prepared by the condensation reaction of toluene diisocyanate under the catalysis of an organic phosphine, and is terminated with a monocyanate; the polycarbodiimide has a weight average molecular weight of 900; and the polycarbodiimide contains at least The polymer of two acidic fun...

Embodiment 2

[0059] Weigh 6 parts by mass of polymers containing at least two acidic functional groups, 1.5 parts of plasticizer diisononyl phthalate (DINP), 0.5 parts of pigments, add to the reaction kettle, heat up to 100 ° C, and stir Add 35 parts of calcium carbonate and 7 parts of mica powder, and vacuum dehydrate for 3 hours. Cool down to 60°C, add 22 parts of polycarbodiimide curing agent, and stir at high speed for 2 hours. Then lower the temperature to 50°C, add 0.3 parts of defoamer, 5 parts of solvent and 0.5 parts of methyltetrahydrophthalic anhydride, and continue stirring for 1 hour. Vacuum discharge to obtain a one-component polyurea waterproof coating.

[0060] Wherein, the polycarbodiimide is made by the condensation reaction of diphenylmethane diisocyanate under the catalysis of organic phosphine, and is terminated with monocyanate; the weight average molecular weight of the polycarbodiimide is 1600; the The polymer containing at least two acidic functional groups is a ...

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PUM

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Abstract

The invention discloses a single-component poly-ureide waterproof paint and a preparation method thereof. The waterproof paint comprises poly-ureide, a pigment, a filler, a latent curing agent, a plasticizer, a catalyst, a solvent and an auxiliary, the latent curing agent, the plasticizer, the catalyst, the solvent and the auxiliary are optional, wherein the poly-ureide is prepared through the reaction of polycarbodiimide and a polymer comprising at least two acidic functional groups; wherein the polycarbodiimide is 7-99 parts by mass, the polymer comprising at least two acidic functional groups is 1-93 parts, the pigment is 0.2-2 parts, the filler is 10-100 parts, the latent curing agent is 0-5 parts, the plasticizer is 0-10 parts, the catalyst is 0-0.5 part, the solvent is 0-30 parts, and the auxiliary is 0-5 parts. The single-component poly-ureide waterproof paint effectively solves the problems that the polyurethane material is sensitive to water vapor and foams in the processes ofpreparation, application and construction.

Description

technical field [0001] The invention belongs to the technical field of building sealant materials, and more specifically relates to a single-component polyureide waterproof coating and a preparation method thereof. Background technique [0002] Polyurethane is also called polyurethane, and the carbamate group is mainly obtained by the addition reaction of isocyanate group (-NCO) and hydroxyl group (-OH), that is, the active hydrogen atom in the hydroxyl group is transferred to the isocyanate group . Due to the rich variety of hydroxyl resins and isocyanates, the properties of polyurethane materials are widely adjustable. [0003] Polyurethane material has excellent performance and has been widely used in various industries, such as automobile industry, coating industry, adhesive industry, electronics industry, etc., and its application forms are also diverse, including foam, film, coating, composite materials, etc. Among them, polyurethane coating is an important branch, w...

Claims

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Application Information

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IPC IPC(8): C09D175/02C09D175/14C09D7/63C09D7/61
CPCC08K2003/265C09D7/61C09D7/63C09D175/02C09D175/14C08K13/02C08K5/12C08K3/26C08K3/34C08L91/06
Inventor 牟辰中李红英王新锋段文锋
Owner BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD