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Photocurable fluoropolyether-based rubber composition, cured product thereof, method for suppressing foaming of cured fluoropolyether-based rubber during sealing and curing

A rubber composition and photocurable technology, applied in the direction of coating, etc., can solve the problems of unstable physical properties, rubber foaming, poor appearance, etc., and achieve the effect of stabilizing physical properties

Active Publication Date: 2021-10-26
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the composition is cured at room temperature or in a closed system after light irradiation, there are problems such as foaming of the rubber, poor appearance, and instability of physical properties.

Method used

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  • Photocurable fluoropolyether-based rubber composition, cured product thereof, method for suppressing foaming of cured fluoropolyether-based rubber during sealing and curing
  • Photocurable fluoropolyether-based rubber composition, cured product thereof, method for suppressing foaming of cured fluoropolyether-based rubber during sealing and curing
  • Photocurable fluoropolyether-based rubber composition, cured product thereof, method for suppressing foaming of cured fluoropolyether-based rubber during sealing and curing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0240] The following shows examples and comparative examples of the present invention specifically, but the present invention is not restricted by the following embodiment Examples. Incidentally, in the following examples, Me represents a methyl group, parts represents parts by mass. Further, the viscosity denotes measured values ​​(according to JIS K7117-1) at 23 ℃. GPC analysis indicates a molecular weight of a fluorine-based solvent is used as the eluent in the polystyrene equivalent number average molecular weight. Further, the fluorine content (%) indicates mass%.

[0241] Manufacturing photocurable fluoropolyether rubber composition by mixing with base

manufacture example

[0243] In the polymer (viscosity of 9,000mPa · s, an amount of vinyl 0.013 mol / 100g, number average molecular weight 15,700) 100 parts of a hydrophobic silica in the filler is fumed silica is represented by the following formula (6) silicon (trade name AEROSILR972: BET specific surface area of ​​130m 2 / G: of AEROSIL Japan (Co., Ltd.) trade name) was added portionwise 10 parts of a planetary mixer, a kneading for 1 hour. Next, a heat treatment at 150 deg.] C under a reduced pressure mixed (-0.08 ~ -0.10MPa) 1 hour, dispersed with a three-roll After cooling, the manufacture of the base compound.

[0244] [36] of

[0245]

[0246] (M + n ≒ 90)

[0247] [A linear polyfluoro compound and a fluorinated organohydrogenpolysiloxane compatible confirmation]

reference example 1

[0249] Expressed with respect to 100 parts of the polymer, a fluorine-containing organohydrogenpolysiloxane represented by the following formula (7) 3.12 parts (Si-H group content of 0.00500 mol / g, fluorine content by the above formula (6): 41.1%), at room temperature with (23 ℃) mixing means (of THINKY Corporation ARE-310) was stirred at 2,000rpm for 1 minute, then, centrifuged for 1 minute at 2,200rpm for degassing, and then, static at 23 ℃ stand for 1 hour, the transparency was visually confirmed that the mixed solution. The results are shown in Table 1.

[0250] [37] of

[0251]

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PUM

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Abstract

The present invention relates to a photocurable fluoropolyether rubber composition and its cured product. The present invention provides a photocurable fluoropolyether rubber composition in which foaming of rubber during sealing curing is reduced in a photocurable fluoropolyether rubber composition using a photoactive hydrosilylation reaction catalyst, and a cured product thereof . A photocurable fluoropolyether-based rubber composition comprising: (A) a linear polyfluoro compound having two or more alkenyl groups in one molecule and a linear perfluoropolyether structure in the main chain: 100 parts by mass; (B) a fluorine-containing organohydrogenpolysiloxane having 2 or more hydrogen atoms (Si-H groups) directly bonded to silicon atoms in one molecule and having a fluorine content of 40% by mass or more: the amount is such that Si-H group in (B) component is 0.5 to 3 mol with respect to 1 mol of alkenyl group in (A) component; and (C) photoactive type hydrosilylation reaction catalyst: relative to the mass of (A) component , calculated in terms of metal atoms, is 0.1 to 500 ppm.

Description

Technical field [0001] The present invention relates to a foaming of rubber when cured in a closed system, a photocurable fluoropolyether rubber composition, which is cured by light, particularly ultraviolet rays, and its cured product, and inhibiting fluoropolyethers. A method of foaming when rubber cured objects are subjected to curing. Background technique [0002] In the past, heated curable fluoropolyether rubber composition has excellent characteristics due to heat resistance, low temperature, chemical resistance, solvent resistance, oil resistance, etc., and therefore, it is widely used in the automotive industry. Applications in the field (Patent Documents 1, 2, and 3: Japanese Laid-Open Patent No. 3,646,775, Japanese Patent No. 4,016,239, Japanese Patent No. 4,016,239. However, the above-mentioned heat-cured composition has a problem, etc. Heating components; the molding process is due to a batch, so the productivity is lowered. [0003] In this regard, it was found that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L71/00
CPCC08L71/00C08L2201/10C08L2205/025C08L2205/05C08G77/46C08G77/24C08G77/12C08G77/08C08G77/20C09D183/12
Inventor 武藤光夫
Owner SHIN ETSU CHEM IND CO LTD
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