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Single component moisture curing polyurethane waterproof coating

A polyurethane waterproof, one-component technology, applied in polyurea/polyurethane coatings, coatings, roof insulation materials, etc., to achieve the effect of improved rain resistance and curability

Inactive Publication Date: 2019-10-29
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the sag and rain resistance and storage stability of these waterproof membranes need to be further improved

Method used

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  • Single component moisture curing polyurethane waterproof coating
  • Single component moisture curing polyurethane waterproof coating
  • Single component moisture curing polyurethane waterproof coating

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The method for preparing the polyurethane prepolymer of the present invention comprises optionally in the presence of a catalyst, the polyol component and toluene diisocyanate (TDI) (such as 2,4- or 2,6-toluene diisocyanate or a mixture thereof) reaction. Toluene diisocyanate is known per se to those skilled in the art and is commercially available under various trade names.

[0035] Polyurethane prepolymers can be prepared using one or more polyols. Although the polyols used in polyurethane preparation can theoretically be, for example, polyether polyols, polyester polyols, polycarbonate polyols, castor oil and its derivatives or hydroxyl-functional polybutadienes and mixtures thereof, in In order to realize the above-mentioned performance improvement within the scope of the present invention, especially from the aspects of viscosity and water resistance, the polyol component is basically composed of polyether polyol, more preferably 80% by weight, preferably 90% by w...

Embodiment

[0124] The following examples further illustrate the present application, but it should be clear that the present application is not limited to these examples.

[0125] raw material

[0126]

[0127] Preparation of prepolymer

[0128] Preparation of TDI prepolymer:

[0129] Add 536.1g of trihydric alcohol (molecular weight: 4800) and 340.8g dihydric alcohol (molecular weight: 2000) into the pre-polymerization reaction device, and adjust the temperature of the oil bath to the reaction temperature (50±5)°C. Under the protection of nitrogen, 122.4g of TDI and 0.8g of catalyst were quickly added to the reaction device, and the temperature was raised to (80±5)°C for prepolymerization. During the reaction process, samples were taken to analyze the content of NCO. When the analysis value was basically consistent with the design value, the reaction was terminated, and the product was packed into a sealed container and sealed with nitrogen gas.

[0130] Preparation of MDI ...

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Abstract

The invention relates to a single component moisture curing polyurethane waterproof coating, a film formed by the single component moisture curing polyurethane waterproof coating and a waterproof system. The polyurethane waterproof coating is prepared from at least one polyurethane prepolymer formed by a polyol component and toluene diisocyanate, and at least one aldimine latent curing agent, wherein the polyol component is prepared from the following components in percentage by weight: 50-90% of ternary alcohol and 10-50% of binary alcohol, and the average molecular weight of the ternary alcohol is 3000-6000g / mol and the average molecular weight of the binary alcohol is 1000-4000g / mol.

Description

[0001] field of invention [0002] The invention relates to a one-component moisture-curing polyurethane waterproof coating, a film formed by the coating and a waterproof system. In particular, the polyurethane waterproof coating of the present invention is a one-component, moisture-curing coating that can be applied at low temperature. [0003] Background of the invention [0004] 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. [0005] Prior art liquid-applied waterproofing membranes tend to be reactive polyurethane compositions formulated as one- or two-component systems, also known as one-part or two-part systems, respectively. Two-component systems are more complex to apply, requiring special mixing...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D7/63E04D13/16
CPCC09D175/08C09D7/63E04D13/16C08K5/29
Inventor 宋志勇刘栋梁
Owner SIKA TECH AG
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