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VOC-free or VOC-poor polyurethane coating

A polyurethane polymer, weight technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as unstable coatings, insufficient mechanical properties, unevenness, etc.

Inactive Publication Date: 2009-07-15
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a two-component system presupposes that the two components are mixed thoroughly and that the mixing ratio and pot life are maintained correctly; on the other hand, uneven and uncleanly fully cured, mechanically insufficient or unstable coating

Method used

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  • VOC-free or VOC-poor polyurethane coating
  • VOC-free or VOC-poor polyurethane coating
  • VOC-free or VOC-poor polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0173] 30 parts by weight of XP 2599 (viscosity 3.7Pa·s at 20°C) and 1.5 parts by weight of N 3600 mixed with each other. The viscosity of the mixture was 3.6 Pa·s at 20°C.

[0174] Then 12 parts by weight of polyaldimine ALD1 are mixed in uniformly. The viscosity of the mixture was 1.26 Pa·s at 20°C.

Embodiment 2

[0176] 24.85 parts by weight of polyurethane polymer P1 and 8 parts by weight of Z4470 mixed with each other. The viscosity of the mixture was 7.5 Pa·s at 20°C.

[0177] Then 12 parts by weight of polyaldimine ALD1 are mixed in uniformly. The viscosity of the mixture was 1.66 Pa·s at 20°C.

[0178] Examples 1 and 2 show the good diluting effect of the polyaldimines of the formula (I) in mixtures each comprising a polyurethane polymer P and an oligomeric polyisocyanate OP.

[0179] d) Preparation of filled compositions, application as a coating

Embodiment 3

[0181]The composition of Example 3 is suitable as a one-component, odorless curing, VOC-free and yellowing-resistant coating, for example as a resilient floor covering in the interior area.

[0182] In a vacuum mixer, mix 300 g of XP 2599, 15g N 3600, 5g of p-toluene-sulfonyl isocyanate, 500.4g of dry barium oxide (natural barium sulfate), 4g of Foamex N (Tego Chemie), 1.6g of benzoic acid, 4g of A 555 (Byk Chemie), 40g of titanium dioxide, 10g of 292 (Ciba) and 120 g of polyaldimine ALD1 were processed to a homogeneous, flowable mass, which was stored with exclusion of moisture.

[0183] The composition has a viscosity of 3 Pa·s at 20°C.

[0184] The composition was cast with a layer thickness of 1.1 mm onto a flat PTFE substrate and kept at 23° C. and 50% relative air humidity. 24 hours after application forms a tack-free elastic coating which cures after 7 days at 23° C. and 50% relative air humidity with

[0185] Shore A-hardness is 80,

[0186] The tensil...

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Abstract

The invention relates to humidity hardening compounds containing at least one polyurethane polymer, P, exhibiting an isocyanate group, at least one polyimine ALD of Formula (I) of at least 22% by weight, in relation to the sum of the components of the compound which contain the isocyanate group, as well as, if necessary, a polyisocyanate oligomer OP. The humidity hardening compound is particularly suitable for providing coatings and linings. The use of the imines makes possible VOC-free or VOC poor compounds, which is a substantial advantage for indoor applications.

Description

technical field [0001] The present invention relates to the field of one-component moisture-curing polyurethane compositions and their use, in particular as elastic coatings. Background technique [0002] One-component moisture-curing polyurethane compositions and their use as elastic coatings are known. These compositions are based on oligomers and / or polymers containing isocyanate groups and have a high intrinsic viscosity . In order to still be able to achieve good processability, especially high flowability, significant amounts of volatile organic solvents, generally 10 to 20% by weight, are usually added to the composition. In order to cure the composition without bubbles, so-called "latent curing agents" are also mixed into it in most cases; True curing agent for amine groups and / or alcohol groups and subsequent reaction with isocyanate groups without formation of carbon dioxide gas. Many of these latent curing agents reduce the storage stability of the compositio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/12C08G18/75C08G18/48C09D175/00
CPCC09D175/12C08G18/4808C08G18/10C08G18/12C08G18/792C08G18/3256C08L75/04C08G18/75C09D175/00
Inventor B·沃尔瑟U·伯克哈德特S·施特劳斯C·基尔格N·布兰克
Owner SIKA TECH AG
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