curable composition

A technology of curable composition and polysulfide, which is applied in the field of epoxy resin curable composition, can solve the problem of poor flexibility, water resistance, chemical resistance, weather resistance and adhesive performance, and high production cost High-load wastewater, low polymer molecular weight and other problems, to achieve the effect of good adhesion, fast curing and low viscosity

Active Publication Date: 2016-06-15
TORAY FINE CHEMICALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the mercapto group content increases, the molecular weight of the liquefied polymer becomes lower, but molecular weight control becomes difficult, and as a result, the mercapto group content is limited.
Furthermore, if an attempt is made to significantly increase the content of terminal mercapto groups, there are problems such as the need to use a large amount of liquefaction agent, so the production cost becomes high, and a large amount of high-load waste water is generated from the manufacturing process, which has a bad impact on the environment
These commercially available polyether compounds containing mercapto groups are used in various applications and have the characteristics of high mercapto group content and fast curing. Compared with the case of physical objects, there are problems such as poor flexibility, water resistance, chemical resistance, weather resistance, and adhesiveness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0057] The present invention will be explained more specifically by the following examples.

[0058] Determination of viscosity

[0059] Toki Sangyo U-EII viscometer was used to measure the viscosity of the sample at 25°C.

[0060] GPC analysis, determination of weight average molecular weight (Mw)

[0061] The column used TSKgelG3000HXL, TSKgelG2000HXL, and TSKgelG1000HXL in series, and the detectors used were MODEL504RRIDetector manufactured by GL Sens Co., Ltd. and L-4000UVDetector manufactured by Hitachi Co., Ltd. The sample was dissolved in THF to make a 1% THF solution, with THF at a flow rate of 1.0 ml / min as the mobile phase, and the column temperature was 40°C for measurement. The molecular weight was calculated using PEG as a standard sample and calculated using the GPC data processing software SIC480II database manufactured by Shoko Chemical Co., Ltd.

[0062] Determination of SH content

[0063] The sample is dissolved in a mixed solution of toluene and pyridine, potassium ...

Synthetic example 1

[0073] Using a 1L separable flask, make 622.0g of sodium polysulfide aqueous solution (2.17mol / L), 2.6g of tetrabutylammonium bromide 50% by weight aqueous solution, 142.4g of 42% sodium hydrosulfide aqueous solution, 154.6g Of water, 271.3g of bis(2-chloroethyl)formal, 4.7g of 1,2,3-trichloropropane in the presence of 365.6g of sodium sulfite 16.3% by weight aqueous solution at 80°C for 10 hours, thereby Without solid polysulfide, a light yellow transparent liquid polysulfide is obtained. The obtained polymer had a repeating unit n of 4.4, a viscosity of 302 mPa·s, a Mw measured by GPC of 907, an SH content of 10.0% by weight, and a Hellige color number of 1.

Synthetic example 2

[0075] Using a 1L separable flask, make 310.3g of sodium polysulfide aqueous solution (2.17mol / L), 6.5g of tetrabutylammonium bromide 50% by weight aqueous solution, 77.4g of 42% sodium hydrosulfide aqueous solution, 48.8g Of water, 131.5g of bis(2-chloroethyl)formal, 5.9g of 1,2,3-trichloropropane in the presence of 182.4g of sodium sulfite 16.3% by weight aqueous solution at 80°C for 10 hours, thereby Without solid polysulfide, a light yellow transparent liquid polysulfide is obtained. The viscosity of the obtained polymer was 370 mPa·s, the Mw measured by GPC was 963, the SH content was 9.5% by weight, and the Hellige color number was 1.

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Abstract

The curable composition of the present invention contains a liquid polysulfide containing 8% by weight or more of mercapto groups in one molecule, an epoxy resin, and amines, and the liquid polysulfide is HS-(R-Sx)n-R-SH (wherein R is a divalent or trivalent organic group containing -O-CH2-O-group, the average value of n is less than 10, x is an integer of 1 to 5, and the average value of x is 1 to 2.5). The curable composition of the present invention has sufficient flexibility, and has a high degree of completion of the hardness at the initial stage of curing relative to the final hardness. The curable composition of the present invention has the following characteristics: the hardness increases rapidly during curing, and has low viscosity, and is excellent in flexibility, water resistance, chemical resistance, and weather resistance, and is suitable for civil engineering because of its good adhesion. Adhesives for construction, coating agents for civil engineering and construction, primers for civil engineering and construction, adhesives for electrical and electronic applications, encapsulants for electrical and electronic applications and adhesives for vehicles, primers for vehicles.

Description

Technical field [0001] The present invention relates to a curable composition containing a liquid polysulfide polymer having two or more mercapto groups in one molecule, an epoxy resin, and an amine. In particular, it relates to an epoxy resin curable composition having a high terminal mercapto group content, low viscosity, rapid increase in hardness, and high flexibility of a liquid polysulfide. Background technique [0002] The liquid polysulfide has a mercapto group at the terminal and is easily oxidized and cured by an oxidizing agent such as lead dioxide and manganese dioxide. The rubber-like cured product obtained by curing of polysulfide contains sulfur in the main chain of the molecule and does not contain double bonds, so it has excellent oil resistance, weather resistance, water tightness, air tightness, and good adhesion. , So it is widely used as sealant, adhesive and coating. [0003] The liquid polysulfide has high compatibility with epoxy resins, and can be mixed w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/66C08G59/56
CPCC08G59/56C08G59/66C08L81/04C08L63/00
Inventor 菅康和滨田有纪子松本和则右马埜梨花
Owner TORAY FINE CHEMICALS CO LTD
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