Liquid-applied waterproofing membrane for roofs comprising two different aldimines

A waterproof membrane and aldimine technology, which is applied in the direction of roofing, roofing, roof covering and other directions using sealing aggregates, which can solve the problems of low plasticizing effect and strength development limitation.

Active Publication Date: 2015-09-02
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 for roofs comprising two different aldimines
  • Liquid-applied waterproofing membrane for roofs comprising two different aldimines
  • Liquid-applied waterproofing membrane for roofs comprising two different aldimines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0191] "Normal climate" means a temperature of 23 ± 1° C. and a relative atmospheric humidity of 50 ± 5%.

[0192] The amine content (total content of free and hindered amines, i.e. aldimine groups) of the prepared aldimines was determined by titration (0.1N HClO in glacial acetic acid 4 , relative to crystal violet) and are given in mmol N / g.

[0193] 1. Substances used:

[0194]

[0195] Polymer-1 is obtained by making 906.1 g of polyoxypropylene diol ( from Dow), 28.1g 1,4-butanediol and 514.4g isophorone ( ex Evonik) in the presence of 1.4 g of dibutyltin dilaurate (DBTDL) was reacted according to known methods at 80° C. to obtain an isocyanate-functional polyurethane polymer with an NCO content of 6.34% by weight.

[0196] Aldimine-A1: N,N’,N”-tris(2,2-dimethyl-3-(N-morpholino)-propylene)-polyoxypropylene triamine

[0197] Under a nitrogen atmosphere, 514 g (3.0 mol) of 2,2-dimethyl-3-(N-morpholino)-propanal was placed in a round bottom flask. Then add 440 g (a...

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Abstract

The present invention describes a one-part moisture-curing liquid-applied waterproofing membrane comprising a polyurethane polymer and two different aldimines 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 liquid-applied waterproofing membranes based on one-part moisture-curing polyurethanes, 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 a self-leveling coating, and an open time long enough for hand application, but still cure quickly to lose their brittleness quickly and be walkable early on. Fully cured roof membranes need to have long-lasting elasticity and strength to effectively protect the Buildings are protected from water. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/79C08G18/12C09D175/12C08G18/30C08G18/32
CPCC08G18/792C08G18/755C08G18/12C08G18/3256C08G2190/00C08G18/307C09D175/12C09D175/04E04D7/00
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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