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Liquid-applied waterproofing membrane comprising oxazolidine and aldimine

A technology of waterproof membrane and aldimine, which is applied to the device of coating liquid on the surface, roofing and coating using sealing aggregates, etc., which can solve the problems of strength development limitation, low plasticizing effect, etc.

Active Publication Date: 2015-09-09
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these compositions have good shelf-life stability and cure without unpleasant odor, they are limited in strength development due to the plasticizing effect of low-functionality hardeners and aldol ester blockers

Method used

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  • Liquid-applied waterproofing membrane comprising oxazolidine and aldimine
  • Liquid-applied waterproofing membrane comprising oxazolidine and aldimine
  • Liquid-applied waterproofing membrane comprising oxazolidine and aldimine

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Experimental program
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Effect test

Embodiment

[0194] "Standard climate" means a temperature of 23±1°C and a relative air humidity of 50±5%.

[0195] The amine content (total content of free and blocked amines, aldimino groups) of the prepared aldimines was determined by titration (0.1N HClO in glacial acetic acid 4, with crystal violet as indicator) and are given in mmol N / g.

[0196] 1. Substances used

[0197]

[0198]

[0199] Polymer-1 by making 906.1g polyoxypropylene diol ( 1010L from Dow), 28.1g 1,4-butanediol and 514.4g isophorone diisocyanate ( IPDI, ex Evonik) was reacted according to known methods at 80° C. in the presence of 1.4 g of dibutyltin dilaurate (DBTDL) to obtain an isocyanate-functional polyurethane polymer with an NCO content of 6.34 wt-%.

[0200] Polymer-2 was made by making 290.4g polyoxypropylene diol ( 2000L from Dow), 838.8g of polyoxypropylene diol with an average molecular weight of 4000g / mol ( 4200 from Bayer), 9.8g 1,4-butanediol and 361.0g MDI ( VL 50 from Bayer) was pre...

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Abstract

The present invention describes a one-part moisture-curing liquid-applied waterproofing membrane comprising a polyurethane polymer and both an aldimine and an oxazolidine as blocked amine hardeners in a specific ratio range. The membrane has a low odour, a long shelf life stability, a low viscosity at low solvent content, a sufficiently long open time to allow hand application and cures fast to a solid elastic material. The liquid-applied waterproofing membrane is particularly suitable for roofing applications, possessing high strength, high elongation and good durability under outdoor wheathering conditions in a broad temperature range.

Description

field of invention [0001] The present invention relates to a liquid-applied waterproofing membrane based on one-component moisture-curing polyurethane, especially for roofing applications. Background of the invention [0002] Liquid applied waterproofing membranes are known. In roofing applications, they are used as an alternative to prefabricated sheet membranes, providing easier application, especially in the case of complex roof geometries and for renovation tasks, providing complete adhesion to the substrate flexible seamless roof coating. [0003] Liquid-applied waterproofing membranes on roofs must meet demanding requirements. They need to have a low viscosity to be applied as a self-leveling coating, and an open time long enough for hand application, yet cure quickly to lose their brittleness very quickly. When fully cured, roof membranes need to have durable elasticity and strength to effectively protect structures over a wide range of temperatures and outdoor wea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C09D175/04C08G18/30C08G18/32C08G18/50
CPCC08G18/10C08G18/503C08G18/3256C08G18/307C09D175/04C08G18/12C08G18/755C08G18/792C09D175/12C08G2190/00C09D7/20B05D1/40B32B5/028B32B2260/046B32B2307/7265B32B2419/06E04D7/00E04D11/02
Inventor M·拜恩M·加特尔A·科沃德U·伯克哈德特
Owner SIKA TECH AG
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