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One-part type moisture curable composition

A composition and compound technology, applied in adhesive types, polyurea/polyurethane adhesives, adhesives, etc., can solve the problems of increased modulus of the composition, prepolymer sealing, and high viscosity of the prepolymer

Inactive Publication Date: 2009-04-22
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But when such a prepolymer is used, the viscosity of the prepolymer is inherently high, and for this reason, it exhibits poor workability
In addition, since the modulus of the composition increases after curing, in particular, there is a problem that it is difficult to apply the prepolymer to sealing

Method used

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  • One-part type moisture curable composition
  • One-part type moisture curable composition
  • One-part type moisture curable composition

Examples

Experimental program
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specific Embodiment approach

[0019] The structure of the above-mentioned prepolymer (A), which is one of the main components of the composition according to the present invention, having urea bonds and urethane bonds, and having hydrolyzable silyl groups at the chain ends or their pendant positions is not particularly specific. limit. It is preferable that urea bonds and urethane bonds are contained on the linear main chain, and hydrolyzable silyl groups are contained at chain terminal positions of the molecule, and particularly at both chain terminal positions.

[0020] A hydrolyzable silyl group is a group having at least one hydrolyzable group directly attached to a silicon atom. The hydrolyzable group is preferably an alkoxy group, more preferably C 1 -6 alkoxy, and particularly preferably methoxy.

[0021] The synthesis method of the above-mentioned prepolymer (A) is not limited. For example, the prepolymer can be synthesized by reacting a first compound having an isocyanate group at a chain termi...

Embodiment 1

[0081] In a batch-type twin-shaft kneader, the compound of formula (I) (wherein all X, Y and Z all represent methoxy groups; R and R' all represent methyl groups, and n= 3) A polymer having silyl end groups (hereinafter referred to as "silyl PU prepolymer"); acryloyl MS polymer (MA903, manufactured by Kanegafuchi Chemical Industries Co., Ltd.); ground calcium carbonate (NN500, manufactured by Nitto Funka Kogyo Co., Ltd.); Thixotropic agent composed of urea compound; titanium oxide (TCR-10, manufactured by Sakai Chemical Industry Co., Ltd.) and terephthalic acid-based plasticizer (DIDP, manufactured by J Plus Co., Ltd.). After that, the mixture was stirred while heating and kneaded under reduced pressure. The temperature in the mixture was then raised to 70° C. for dehydration by continuous stirring and kneading. Then, aminosilane (aminotrimethoxysilane / KBE-903, manufactured by Shin-Etsu Chemical Co., Ltd.), dehydrating agent (methyltrimethoxysilane / KBM-13, manufactured by Sh...

Embodiment 2

[0083] A one-part type moisture-curable composition was obtained in the same manner as described in Example 1, except that the acryl-based MS polymer was replaced with MS polymer (Excestar S2420, manufactured by Asahi Glass Co., Ltd.).

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Abstract

Provided is a one-part type moisture curable composition exhibiting superior adhesion properties, weather resistance, coating tolerance, and the like, and providing good operationability, which is cured by moisture in the atmosphere to form an elastic material in the form of a rubber. A one-part type moisture curable composition comprising: (A) a prepolymer having a urea bond(s), a urethane bond(s), and a hydrolysable silyl group(s) at a chain end(s) or pendent position(s) thereof; and (B) a polymer comprising a polyether structure(s) and / or a polyacryl structure(s) in the main chain, and having a hydrolysable silyl group(s) at a chain end(s) or pendent position(s) thereof.

Description

technical field [0001] The present invention relates to a one-part moisture-curable composition that is easily cured by moisture, exhibits excellent adhesive properties, and can be easily applied after the composition is cured. Background technique [0002] Generally, modified silicones, polyurethanes, and the like are used as resin components in moisture-curable compositions for sealing products, adhesives, and similar civil engineering applications due to their good workability and good adhesive properties. Wide range of applications in engineering and construction engineering, automotive and similar industries. [0003] Recently, in civil engineering and construction engineering, automotive and similar industries, there has been an increasing demand for maintaining the initial behavior over a long period of time, in other words "extraordinarily-" extended life. It is therefore necessary for sealing products, adhesives and the like used therein to maintain properties such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08F283/06C08G65/336C09J175/04
CPCC08G2190/00C08G18/10C09J175/04C08G18/4825C08G18/289
Inventor S·角野T·佐崎
Owner SIKA TECH AG
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