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Composition containing a surface-deactivated polyisocyanate and curing in two stages

A polyisocyanate and surface deactivation technology, applied in polyurea/polyurethane adhesives, adhesive heating bonding methods, adhesive types, etc., can solve problems such as operational safety and operational restrictions

Inactive Publication Date: 2012-04-18
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, due to the basicity and corrosiveness of polyamine amino groups, the amino groups of polyamines cause great restrictions in handling and cause problems in terms of handling safety

Method used

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  • Composition containing a surface-deactivated polyisocyanate and curing in two stages
  • Composition containing a surface-deactivated polyisocyanate and curing in two stages
  • Composition containing a surface-deactivated polyisocyanate and curing in two stages

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Experimental program
Comparison scheme
Effect test

Embodiment

[0258] "Standard climate" means a temperature of 23 ± 1° C. and a relative air humidity of 50 ± 5%. "RT" stands for room temperature.

[0259] 1. Description of test method

[0260] The amine content, i.e. the total content of blocked amino groups (aldimino groups) and free amino groups in the prepared compounds, was determined by titration (0.1N HClO in glacial acetic acid 4 , with crystal violet as indicator) and always expressed in mmol N / g.

[0261] 2. Preparation of blocked amines

[0262] Aldimine A-1

[0263] In a round-bottomed flask, 625 g of 2,2-dimethyl-3-lauroyloxy-propionaldehyde was preliminarily charged under a nitrogen atmosphere. Under vigorous stirring, slowly add 334.2 g of polyethertriamine ( T-403, Huntsman; amine content 6.29 mmol N / g). Subsequently, the volatile constituents were removed in vacuo (10 mbar, 80° C.). Yield: 921 g of a clear, pale yellow liquid with an amine content of 2.28 mmol N / g.

[0264] Aldimine A-2

[0265] In a round-b...

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Abstract

The present invention relates to single-component compositions that can be cured in two stages, wherein in the first curing stage, compositions pre-cured by means of moisture and having in particular plastic properties are formed, and wherein in the second curing stage, compositions cured by means of heat and having in particular elastic properties are formed. Said two-stage compositions are suitable in particular as adhesives and have the great advantage that thanks to said two-stage compositions, an adhesive can be applied to a substrate, said adhesive cures by means of moisture in such a way that it can be handled and stored without problems, and said adhesive can be cured easily in an adhering step by means of heat only when needed.

Description

technical field [0001] The present invention relates to the field of one-component curable compositions and their use as two-stage curing adhesives. Background technique [0002] Adhesive methods are frequently used in the manufacture of goods, since adhesive is characterized by technical and environmental advantages compared to other joining techniques. Especially in bonding methods using reactive adhesives that cure by chemical crosslinking, it is often desired that the coating of the adhesive on the joined parts is bonded to itself, that is, the bonding of one joined part to another. A material-bonding (stoffschlüssigen) connection that can be separated spatially or temporally, thus on the one hand facilitating the joining process and on the other hand avoiding the need for special application devices and often also handling safety measures as well as additional cleaning steps during the manufacturing process Adhesive Peripherals (Umgang). One approach to separate adhes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/32C09J175/00C08G18/72C08G18/79C09J5/06
CPCC08G18/703C09J175/02C08G18/798C08G18/10Y10T428/31551C08G18/8054C08G18/3256
Inventor A·萨恩M·施伦普夫U·布尔克哈特
Owner SIKA TECH AG
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