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Spraying polyurea elastic coating and preparing method thereof

An elastic coating and polyurea technology, applied in the coating field, can solve problems such as blocking guns, and achieve the effect of solving foaming and ensuring storage stability.

Active Publication Date: 2016-01-20
FOSHAN KESHUN BUILDING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention proposes a spray polyurea elastic coating, which solves the problem of gun blocking during the spraying process by adding multifunctional oxazolidine, thereby solving the problems existing in the prior art

Method used

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  • Spraying polyurea elastic coating and preparing method thereof
  • Spraying polyurea elastic coating and preparing method thereof
  • Spraying polyurea elastic coating and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A polyurea elastic coating for spraying, which is composed of component A and component B. The ratio of raw materials for component A is as follows: polyisocyanate 55% to 65%, polyether polyol 35% to 45%; component B The ratio of raw materials by mass percentage is as follows: amino-terminated polyether 45%-55%, amine chain extender 34-45%, multifunctional oxazolidine liquid water remover 5-10%, defoamer 0.5-1% , Dispersant 0.5-1%.

[0025] The polyisocyanate is selected from 4,4'-MDI (4,4'-diphenylmethane diisocyanate), 2,4'-MDI (2,4-diphenylmethane diisocyanate), PAPI (polymethylene At least one of base polyphenyl polyisocyanate), IPDI (isophorone diisocyanate), HMDI (dicyclohexylmethane-4,4'-diisocyanate).

[0026] The polyether polyol is at least one of the following substances with a number average molecular weight of 500-5000: polyoxypropylene polyol, polyacrylate polyol, polybutadiene polyol, polycarbonate polyol, polytetrahydrofuran ether polyol .

[0027] Mu...

Embodiment 2

[0037] Same as Example 1, the difference is:

[0038]Polyisocyanate is preferably 4,4'-diphenylmethane diisocyanate in this embodiment, and its mass percentage is 55%; polyether polyol is preferably polyoxypropylene polyol 330N in this embodiment, and its mass percentage is 45% ; Multifunctional oxazolidine is preferably 2-isopropyl-3-hydroxyethyl-1,3-oxazolidine in this embodiment, and its mass percentage is 10%; amino-terminated polyether is preferred in this embodiment The mixture of polyetheramine JeffamineD1000 and polyetheramine JeffamineT5000, the mass percent of polyetheramine JeffamineD1000 is 30%, the mass percent of polyetheramine JeffamineT5000 is 25%; the amine chain extender is preferably diethyl toluene di Amine, its mass percentage is 34%; defoamer is EfkaSI2723, its mass percentage is 0.5%; dispersant is Efka4585, its mass percentage is 0.5%.

[0039] Because the coating prepared in Example 2 is in a uniform liquid state, the A component and the B component a...

Embodiment 3

[0041] Same as Example 1, the difference is:

[0042] The polyisocyanate is preferably a mixture of 4,4'-diphenylmethane diisocyanate and 2,4'-diphenylmethane diisocyanate in this embodiment, wherein the mass percentage of 4,4'-diphenylmethane diisocyanate is 35%, the mass percentage of 2,4'-diphenylmethane diisocyanate is 30%; polyether polyol is preferably polycarbonate polyol 1000D in this embodiment, its mass percentage is 35%; multifunctionality oxazole Alkanes are preferably di-2,2-dimethyl-N-hydroxyethyl-1,3-oxazolidinyl malonate in this embodiment, and its mass percentage is 8%; Among them, polyetheramine JeffamineD2000 is preferred, and its mass percentage is 45%; the amine chain extender is preferably 4,4'-bis-sec-butylaminodiphenylmethane in this embodiment, and its mass percentage is 45%; the defoamer is EfkaPB2001, its mass percentage is 1%; the dispersant is Efka5205, its mass percentage is 1%.

[0043] In Example 3, both component A and component B are in a un...

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Abstract

The invention relates to a coating, in particular to a spraying polyurea elastic coating. The spraying polyurea elastic coating is composed of a component A and a component B. The component A is prepared from, by mass, 55% to 65% of polyisocyanate and 35% to 45% of polyether polyol. The component B is prepared from, by mass, 45% to 55% of amine-terminated polyether, 34% to 45% of amine chain extenders, 5% to 10% of polyfunctionality oxazolidine, 0.5% to 1% of defoaming agents and 0.5% to 1% of dispersing agents. According to the spraying polyurea elastic coating, as the polyfunctionality oxazolidine is added into the dewatered amine-terminated polyether, hydroxyl terminated polyether and the amine chain extenders and can be firstly reacted with a small amount of moisture generated in the use process, the transport process and the use process to generate amino-and-hydroxyl-containing open-loop compounds, then the compounds are reacted with isocyanate groups of polyurea curing agents to be cured, carbon dioxide gas is not generated in the whole curing process, and the defect that a paint film is bubbly is well overcome.

Description

Technical field: [0001] The invention relates to a coating, in particular to a spray polyurea elastic coating and a preparation method thereof. Background technique: [0002] Polyurea coating is a new type of environmental protection material without metal catalyst. A and B components are sprayed by high temperature and high pressure equipment. The curing speed is fast, the process is simple, the façade spraying does not sag and has excellent mechanical properties and waterproof properties. [0003] Due to the very fast curing speed of polyurea, special spraying equipment must be used. The existing technology uses a large amount of solid powder for water absorption and reinforcement. Gun blocking often occurs at the construction site, which affects construction efficiency. A large amount of organic solvents are used to clean spray guns on the construction site, which pollutes the environment and has a great impact on the health of operators. According to experiments, the ...

Claims

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Application Information

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IPC IPC(8): C09D175/02C09D7/12C08G18/66C08G18/48C08G18/50C08G18/65C08G18/62C08G18/69C08G18/44
Inventor 陈伟忠林焕章游启明龚兴宇刘勤陈驰辉
Owner FOSHAN KESHUN BUILDING MATERIAL CO LTD
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