Polysulfide curable composition

A technology for curable compositions and polymers, applied in the field of curable compositions, can solve the problems of fast thickening speed, adverse effects of foaming, reduced operability, etc., and achieve the effect of sufficient service life

Active Publication Date: 2012-01-25
SUNSTAR GIKEN KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if the reaction rate is adjusted by increasing the amount of the catalyst to suppress foaming in a high-temperature and high-humidity environment, the thickening speed after the matrix / curing agent is mixed will become faster, and the necessary service life cannot be guaranteed, which will make the operation Significantly reduced sex
In addition, if the catalyst is reduced in order to ensure the service life and the reaction rate is slowed down, the reaction between isocyanate and moisture will increase relatively, which will adversely affect the foamability
[0005] Under such circumstances, as a means of suppressing foaming and ensuring a service life, Japanese Patent Laid-Open No. 10-121031 (Patent Document 1) proposes to contain a curing catalyst composed of a tertiary amine and / or an organometallic compound and as a curing agent. Acidic phosphate ester of blocking agent, but there are problems such as reduced effect after storage and insufficient effect in high temperature and high humidity environment in midsummer
In addition, in JP-A-2000-273438 (Patent Document 2), it is proposed to limit the ratio of a specific isocyanate compound to isocyanate group / thiol and to contain a reaction retarder, but it is still difficult to adjust and use it in the harsh environment of midsummer Balance of life and foamability

Method used

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  • Polysulfide curable composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4 and comparative example 1～3

[0066] The base and the curing agent were uniformly mixed using the components in parts by weight shown in Table 1 below to produce a polysulfide composition. Among them, the polyurethane prepolymer in Table 1 is obtained by mixing polypropylene glycol and xylylene diisocyanate to a (NCO) / (OH) of 1.85 and reacting at 80°C for 14 hours. The NCO content is 3.0 %, the viscosity is 16000mPa·s.

[0067] The obtained polysulfide compositions were submitted to performance tests respectively, and the results were recorded in Table 1.

[0068] [Evaluation method]

[0069] 1. Foaming

[0070] The mixed matrix and curing agent were weighed at a weight ratio of 100:23, filled into a 45mm×h18mm cylindrical container (material: polypropylene), and placed in an atmosphere of 50°C for 24 hours, and then the sealing material swelled out of the container was measured The foaming height of the cured product.

[0071] 2. Service life

[0072] The matrix and curing agent are mixed, and the polymer sheet i...

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Abstract

Disclosed is a curable composition containing (A) a polysulfide ether polymer, (B) a terminal isocyanate group-containing urethane prepolymer and / or a polyisocyanate compound and (C) a curing catalyst containing an organic tin compound and an organic carboxylic acid metal salt (particularly, an organic carboxylic acid alkaline earth metal salt). The curable composition enables to secure a sufficient working life even under high temperature high humidity conditions, while being greatly improved in foaming during curing and having an excellently balanced workability.

Description

Technical field [0001] This application claims priority to Japanese Patent Application No. 2006-281233, and the entirety is incorporated into this specification by reference. [0002] The present invention relates to a polysulfide-based curable composition, and more specifically, to an operation that can ensure the service life necessary for operation even in a high-temperature and high-humidity environment and can significantly inhibit foaming during curing. A particularly useful curable composition for sealing materials. Background technique [0003] In the past, in polysulfide-based curable compositions, especially in high-temperature and high-humidity environments, the isocyanate group of the curing agent component reacts with the moisture in the operating environment or in the component to generate carbon dioxide and expand the surface excessively. It has become a problem in design, waterproofing, and bonding strength. In addition, polysulfide-based sealing materials are mos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/50C08G18/22
CPCC08G18/4825C08G18/7642C08G18/225C08G18/10
Inventor 鸟居智之飞田圭之森正仁
Owner SUNSTAR GIKEN KK
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