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Knife coating type polyurea waterproof coating

A technology of waterproof coating and polyurea, applied in the direction of polyurea/polyurethane coating, coating, etc., can solve the problem of low strength of scraping polyurea, and achieve the effect of excellent waterproof performance and excellent mechanical and mechanical properties of the coating

Active Publication Date: 2010-09-01
BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The scratch-coated polyurea currently on the market has low strength and has no difference in physical and mechanical properties from high-strength polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 207g of polyether diol and 80g of plasticizer into a 500mL four-necked reaction flask, heat up to 100°C to 120°C for vacuum dehydration for 4 hours, lower the temperature below 50°C, add 224g of diisocyanate, heat up slowly, and control the temperature to 80°C. ~85°C, react under vacuum conditions for 2.5h, lower the temperature by 50-60°C, add defoamer, stir for 30min, discharge and seal to obtain component A.

[0024] Add 290g of polyether trihydric alcohol into a 500mL four-necked reaction flask, raise the temperature to 80°C, add 4.5g of titanium dioxide, add 90g of chain extender, stir well, raise the temperature to 100°C to 120°C for vacuum dehydration for 4 hours, and cool down for 50°C ~60°C, add 1.5g dibutyltin dilaurate, 0.3g defoamer, 2.3g UV absorber, 0.2g dispersant, 0.2g anti-separation additive and stir for 10min, then add 13.5g molecular sieve water-absorbing agent, stir After 20 minutes, add the color paste, stir evenly, and discharge to obtain comp...

Embodiment 2

[0026] A component according to embodiment 1. The amount of chain extender in component B is 110 g.

Embodiment 3

[0028] A component according to embodiment 1. The amount of chain extender in component B is 130 g.

[0029] Performance Testing:

[0030] The scratch-coated polyurea prepared above was tested for some physical and mechanical properties according to the test method GB / T 16777-1997 for building waterproof materials under specified conditions. Its Table 1 lists some basic performance test results of scrape-coated polyurea.

[0031] Table 1 Performance test results of scratch-coated polyurea waterproof coating

[0032] Performance

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PUM

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Abstract

The invention discloses a knife coating type polyurea waterproof coating comprising a main agent and a curing agent with the mass ratio of 1.0-1.5:1, wherein the main agent is an end NCO-based prepolymer obtained by reacting polyether polyol subjected to vacuum dehydration with polyisocyanate and contains 30-40 percent by weight of polyether glycol and 30-45 percent by weight of diisocyanate, the curing agent is formed by mixing an active hydride, a plasticizer and inorganic fillers subjected to vacuum dehydration with a catalyst, a defoamer and a dispersant disperser and contains 70-95 percent by weight of active substances. The knife coating type polyurea waterproof coating has the solid content of 100 percent, has the advantages of tastelessness, nontoxicity and no pollution in the construction process, and is not influenced by environmental dampness and moisture. A formed film layer has the advantages of excellent mechanical property and weatherability as well as favorable high-low temperature resistance, solvent resistance and corrosion resistance and has favorable bond property with materials such as cement products, steel products, wood products, glass fiber products, and the like.

Description

Technical field: [0001] The invention relates to the field of architectural coatings, in particular to a scraping type polyurea waterproof coating and a construction method thereof. Background technique: [0002] Polyurea elastomer is a newest type developed to meet the needs of long-term protection of the surface of concrete, steel structures and their components after the mature application of advanced technologies such as high-solid coatings and light-curing (UV) coatings. protective material. In the mid-1980s, the United States and Europe took the lead in developing and popularizing it on a large scale. After achieving great success, the technology has been rapidly promoted and developed at home and abroad. [0003] In the mid-1980s, Mr. Dudley J Primeaux of the American Texaco Company took the lead in developing the spray polyurea elastomer (SPUA for short), thus fundamentally solving the major technical problems that plagued the construction industry. In 1991, this t...

Claims

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Application Information

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IPC IPC(8): C09D175/02C09D5/00C09D7/12
Inventor 田凤兰段文锋孙金梅杨红艳王新锋
Owner BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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