Mold-releasable curable composition
A curable composition and compound technology, applied in the field of curable compositions, can solve the problems of rubber cracking, insufficient mold release, and rubber inability to release the mold, etc.
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[0396] Examples and comparative examples of the present invention will be described below. However, the present invention is not limited to these Examples.
[0397] In the following Examples and Comparative Examples, "parts" and "%" represent "parts by weight" and "% by weight", respectively. In the examples, "triamine" is "pentamethyldiethylenetriamine".
[0398] In the following examples, "number average molecular weight" and "molecular weight distribution (ratio of weight average molecular weight to number average molecular weight)" were calculated based on polystyrene standard samples using gel permeation chromatography (GPC). In GPC, a cross-linked polystyrene gel-packed GPC column (shodex GPC K-804; manufactured by Showa Denko) was used, and chloroform was used as a GPC solvent.
[0399] The mold releasability of the cured product was evaluated using the following four criteria.
[0400] ◎: The cured product can be easily taken out from the mold.
[0401] ◯: The cure...
manufacture example 1
[0405] CuBr (1.11 kg) was charged to a 250 L reactor equipped with a stirrer and jacket, and the reactor was replaced with nitrogen. Acetonitrile (5.0 kg) was added, warm water was passed through the jacket, and the mixture was stirred at 70° C. for 15 minutes. Thereto were added butyl acrylate (6.6 kg), ethyl acrylate (9.5 kg), methoxyethyl acrylate (7.8 kg), diethyl 2,5-dibromoadipate (3.09 kg) and acetonitrile (5.0 kg) and stirred at 70°C for about 30 minutes. Pentamethyldiethylenetriamine (hereinafter referred to as "triamine") was added to initiate the reaction. During the reaction, triamine is appropriately added to the reaction mixture, and the polymerization is carried out at an internal temperature of about 70°C to 80°C. The total amount of triamine used in the polymerization step was 45 g. Four hours after the start of the reaction, unreacted monomers and acetonitrile were distilled off with heating and stirring at 80° C. under reduced pressure. Acetonitrile (29....
Embodiment 1
[0409] To 100 parts of the copolymer [P1] prepared in Production Example 1, 20 parts of Aerogel R974 (average primary particle size: 12 nm: manufactured by Japan Aerogel) as reinforcing silica and 1 part of magnesium stearate (trade name SM-1000, manufactured by Sakai Chemical) as a metal soap was thoroughly mixed using a three-roll mill for paint. Add linear siloxane (each molecule contains an average of 5 hydrosilyl groups and an average of 5 α-methylstyrene groups: Si-H group content 3.70mmol / g) to the copolymer [P1] so that The SiH group in the linear siloxane was 1.8 equivalents to the alkenyl group of the copolymer [P1]. Xylene solution (1.32×10 -5 mmol / μl), the amount of which is converted to platinum is 5×10 of the alkenyl group of the copolymer [P1] -4 Molar equivalents, further mixed uniformly. The prepared curable composition was fully degassed in a vacuum oven at 50° C., and then poured into a mold made of stainless steel. Press vulcanization was carried out at...
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