Polyurethane composition having long pot life and high strength
A composition and compound technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as odor formation, emission, migration or plasticization, and achieve high strength, improved strength and toughness, and long open time.
Active Publication Date: 2021-02-05
SIKA TECH AG
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
Due to the delayed release of amino groups, latent curing agents react more slowly with isocyanates than with free polyamines, but this is often still too fast for sufficiently long processing times with aromatic isocyanates
In addition, released sealants may lead to undesired odor formation, emission, migration or plasticization
Method used
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Embodiment
[0258] Examples are described below, which explain the present invention in more detail. The invention is of course not limited to the described embodiments.
[0259] "Standard climate" means a temperature of 23±1° C. and a relative air humidity of 50±5%.
[0260] If not stated otherwise, the chemicals used were obtained from Sigma-Aldrich and no other pretreatments were performed.
[0261] Preparation of compounds with reactive groups of formula (I):
[0262] Determine the amine value by titration (using 0.1N HClO in acetic acid 4 , with crystal violet as the indicator).
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Abstract
The invention relates to a composition comprising a first component, containing at least one polyol and at least one compound having at least one reactive group of formula (I), and a second component,containing at least one aromatic polyisocyanate and / or at least one aromatic isocyanate-group-containing polymer. The composition according to the invention has a long open time and, even in the caseof small amounts of bonding to at least one reactive group of formula (I), provides resilient coatings having improved mechanical properties, without causing problems with odour emissions or migration effects. The composition is thus particularly suitable as a coating for floors or roof areas.
Description
technical field [0001] The present invention relates to two-component polyurethane compositions and their use, especially as coatings. Background technique [0002] Two-component polyurethane compositions are used extensively in the construction and manufacturing industry, for example as adhesives, sealants, coatings, renders, casting resins or binders (resin matrices) for composites. It consists of a polyol component and an isocyanate component which are stored separately from each other. The two components are intermixed during application, thereby allowing the composition to cure into a polymeric elastomeric material. The isocyanate component here generally comprises aromatic isocyanates, such as in particular diphenylmethane diisocyanate (MDI) or derivatives thereof. Aliphatic isocyanates are generally only used where particularly high resistance to yellowing is required due to their much higher cost. [0003] Conventional two-component polyurethane compositions based...
Claims
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IPC IPC(8): C09D175/08C08G18/67C08G18/76C08G18/36C08G18/48C08G18/66
CPCC08G18/36C08G18/48C08G18/6696C08G18/676C08G18/7671C09D175/08C08G18/4829C08G18/3256
Inventor H·哈伯勒U·布尔克哈德特
Owner SIKA TECH AG