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Liquid-applied waterproofing membrane for roofs

A waterproof membrane and liquid technology, applied to roofs, roofs, and roof coverings using sealed aggregates, to achieve low odor characteristics, small shrinkage, and accelerated fragile time

Inactive Publication Date: 2015-10-21
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, the disclosed coatings are not suitable as low VOC liquid applied membranes for roofing applications, especially in view of flexibility and / or VOC content

Method used

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  • Liquid-applied waterproofing membrane for roofs
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Experimental program
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Embodiment

[0168] "Normal climate" means a temperature of 23 ± 1° C. and a relative atmospheric humidity of 50 ± 5%.

[0169] The amine content (free and hindered amines, i.e. the total content of 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.

[0170] 1. Preparation of Aldimines

[0171] Aldimine-A1: N,N'-bis(2,2-dimethyl-3-lauroyloxypropylene)-3-aminomethyl-3,5,5-trimethylcyclohexylamine

[0172] Under a nitrogen atmosphere, 598 g (2.1 mol) of 2,2-dimethyl-3-lauroyloxy-propionaldehyde were placed in a round bottom flask. Then add 170.3g (1mol) 3-aminomethyl-3,5,5-trimethylcyclohexylamine ( IPD from Evonik) followed by removal of the volatile content at 80°C and 10 mbar vacuum. This gave a yield of 732 g of an almost colorless liquid with an amine content of 2.73 mmol N / g, corresponding to a calculated aldimine equivalent weight of about 367 g / Eq.

[0173] Aldimine-...

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Abstract

The present invention describes a one-part moisture-curing liquid applied waterproofing membrane comprising an MDI-based 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 act as a self-leveling coating, and an open time long enough for hand application, yet cure quickly to lose their brittleness very quickly. Fully cured roof membranes need to have long-lasting elasticity and strength to effectively protect structures over a wide range of temperatures and outdoor weather conditio...

Claims

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Application Information

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IPC IPC(8): C08G18/12C08G18/48C08G18/76C08G18/79C09D175/12
CPCC08G18/4841C08G18/4812C08G18/7671C08G18/797C08G2190/00C09D175/12C08K5/3435C08G18/12C08G18/3256C08G18/307C09K3/18E04D7/00C09D175/08C08K3/26C08K9/04
Inventor S·基斯里格M·巴尔默
Owner SIKA TECH AG
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