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Low molecular weight amino latent crosslinker and spray polyurea elastomer thereof

A technology of latent crosslinking agent and polyurea elastomer, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems affecting material properties, achieve low molecular weight, cheap price, and reduce costs

Inactive Publication Date: 2009-12-23
北京立高科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a low-molecular-weight amino latent crosslinking agent and its sprayed polyurea elastomer. After the sprayed polyurea elastomer is cured, the residual isocyanate in the system is prone to crosslinking with the active group in the material, which seriously affects Technical problems of material properties; and solve the problems of reducing costs and benefiting general engineering applications

Method used

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  • Low molecular weight amino latent crosslinker and spray polyurea elastomer thereof
  • Low molecular weight amino latent crosslinker and spray polyurea elastomer thereof
  • Low molecular weight amino latent crosslinker and spray polyurea elastomer thereof

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Experimental program
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Effect test

Embodiment 1

[0050] Component A is a semi-prepolymer synthesized by the reaction of diphenylmethane diisocyanate MDI and polyether polyol.

[0051] Component B is composed of amino-terminated polyether, liquid amine chain extender and low-molecular-weight amino latent cross-linking agent of the present invention according to the following proportions by mass:

[0052] Amino-terminated polyether 73 parts

[0053] Liquid amine chain extender 36 parts

[0054] 3 parts of low molecular weight amino latent cross-linking agent Ca-1.

Embodiment 2

[0056] Component A: Use MDI to react with polyether polyol to synthesize a semi-prepolymer, and set the NCO content at 14%; in this way, it can ensure that it has suitable reactivity and low viscosity. If the viscosity is too high, a small amount of carbonate lactone can be added during the preparation of component A.

[0057] Component B: mainly composed of amino-terminated polyether and liquid amine chain extender. Auxiliaries are not considered in the invention.

[0058] The ratio of amino-terminated polyether and amine chain extender is as follows in parts by mass:

[0059] Jeffamine D-2000 (difunctional amino-terminated polyether) 61.53 parts;

[0060] Jeffamine T-5000 (trifunctional amino-terminated polyether) 10.61 parts;

[0061] Ethacure 100 (chain extender) 18.64 parts;

[0062] Unilink 4200 (chain extender [aromatic secondary amine]) 14.4~18.4 parts;

[0063] 0-5 parts of low-molecular-weight amino latent cross-linking agent Ca.

[0064] The preparation method...

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Abstract

The invention relates to a low molecular weight amino latent crosslinker, which is formed by urea or mixture of urea and low molecular weight polyamine. The low molecular weight polyamine is aliphatic or aromatic diamine or triamine. The diamine is dicyandiamide and the triamine is melamine; and the urea and the melamine are mixed according to a weight ratio of 2:1. A spray polyurea elastomer is generated by reaction of an isocyanate component (A component) and an amino compound (B component); the amino compound of the B component comprises amine-terminated resin, an amine-terminated chain extender and a low molecular weight amino latent crosslinker accounting for 0.1% to 5% of the B component. The low molecular weight amino latent crosslinker has easily-obtained materials, convenient processing and relative cheap price, and can reduce the cost of SPUA. As the low molecular weight polymer amine is influenced by ortho-atoms or atom groups, electronegativity of nitrogen atoms in the amino group is reduced, thus utilizing the electron effect to reduce the reactivity of the amino groups and isocyanate.

Description

technical field [0001] The invention relates to a crosslinking agent for preparing sprayed polyurea elastomer and the sprayed polyurea elastomer. Background technique [0002] Spray Polyurea Elastomer (SPUA for short) is a new type of solvent-free and pollution-free green environmental protection material developed in the past ten years. The material is formed by reacting an isocyanate component (component A) and an amino compound component (component B), wherein the component B contains an amino-terminated resin and an amino-terminated chain extender. Since it was put into use in my country in 1999, spray-coated polyurea elastomer has been widely used in the fields of steel structure anticorrosion, building waterproofing, and film and television prop production. Compared with traditional coatings, SPUA has the following advantages: 1. No catalyst, no volatile substances, 100% solid content, friendly to the environment. 2. Fast curing, can be sprayed on any curved surface,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/21C08K5/3492C08K5/31C08G18/66C08G18/50C08G18/32C08G18/76C09D175/02
Inventor 耿志忠段霓华王峰华
Owner 北京立高科技股份有限公司
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