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Liquid-applied waterproofing membrane for roofs comprising a long-chain aldimine

An aldimine and waterproof membrane technology, applied in the field of roofing applications, can solve the problems of unpleasant odor, difficult shelf life stability, difficult processability, slow curing, 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

Attempts to reduce the solvent content of such one-component systems, driven by tightening VOC regulations, often lead to difficulties in shelf-life stability and poor processability due to high viscosity, since the viscosity of the composition starts at a higher level, and further increased due to the early crosslinking reaction between the NCO groups of the prepolymer and the oxazolidine hardener during storage
Additional disadvantages of traditional one-component films relate to slow curing and unpleasant odors caused by emissions of blocking agents, volatile aldehydes or ketones

Method used

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  • Liquid-applied waterproofing membrane for roofs comprising a long-chain aldimine
  • Liquid-applied waterproofing membrane for roofs comprising a long-chain aldimine
  • Liquid-applied waterproofing membrane for roofs comprising a long-chain aldimine

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Experimental program
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Effect test

Embodiment

[0267] "Standard climate" means a temperature of 23 ± 1° C. and a relative atmospheric humidity of 50 ± 5%.

[0268] 1. Preparation of aldimine:

[0269] The amine content (total content of free and blocked amines, aldimino groups) of the prepared aldimines was determined by titration (0.1 N HClO in glacial acetic acid 4 , with crystal violet as indicator) and are given in mmol N / g.

[0270] Aldimine-A1: N,N'-bis(2,2-dimethyl-3-(N-morpholino)-propylene)-polyoxypropylenediamine

[0271] Under a nitrogen atmosphere, 2000g (about 2mol N) of polyoxypropylene diamine (about 2mol N) with an average molecular weight of about 2000g / mol D-2000, ex Huntsman, amine content 1.02 mmol N / g) was placed in a round bottom flask. Then 360 g (2.1 mol) of 2,2-dimethyl-3-(N-morpholino)-propanal were added with good stirring, and the volatile contents were then removed at 80° C. and 10 mbar vacuum. The yield was 2318 g of an almost colorless liquid with an amine content of 1.77 mmol N / g, corr...

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Abstract

The present invention describes a one-part moisture-curing liquid-applied waterproofing membrane comprising a polyurethane polymer, a long-chain aldimine and at least one hardener which is an oxazolidine or another aldimine different from the long-chain aldimine. The membrane has a low viscosity at low solvent content and a good shelf life stability and cures fast to form a solid elastic material. The 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): C08G18/75C08G18/79C08G18/12C09D175/12C08G18/30C08G18/32
CPCC08G18/792C08G18/755C08G18/3256C08G18/12C08G2190/00C08G18/307C09D175/12Y10T428/31551Y10T442/10C09D175/08E04D7/00
Inventor U·伯克哈德特U·斯塔德尔曼H·黑贝勒M·拜恩M·加特尔A·科沃德
Owner SIKA TECH AG
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