Moulding type rubber foam composition, silicon rubber foam and method for procucing it
A technology of silicone rubber and composition, used in shafts and bearings, transportation and packaging, thin material handling, etc., can solve the problems of limited use, harmful decomposition products, and poor mechanical strength of silicone rubber sponges.
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Embodiment 2
[0028] A dichloromethane solution with a solid content of 10% was prepared by dissolving an acrylic resin with a softening point of 85° C. (Elvacite 2008, a product of DuPont Company) in dichloromethane. This dichloromethane solution and distilled water are continuously sprayed into the spray dryer using a two-fluid nozzle. The injection speed of the dichloromethane solution is 100 cc / min, and the injection speed of distilled water is 25 cc / min. The hot nitrogen flow is used as a propellant. During this process, the temperature of the hot nitrogen flow is 80°C and the pressure is 0.25kg / cm 2 (0.025MPa). The obtained hollow acrylic resin particles were immersed in an aqueous solution formed by 100 parts of distilled water and 1 part of nonionic surfactant (ethylene oxide adduct of trimethylnonanol) for 24 hours, and the floating hollow particles were separated and collected. Acrylic resin powder. The obtained hollow acrylic resin powder had an average particle diameter of 20 ...
Embodiment 1
[0030] Add the following materials into a kneading mixer and mix well: 100 parts of dimethylethylene composed of 99.85% (mol) dimethylsiloxane structural units and 0.15% (mol) methylvinylsiloxane structural units Dimethylsiloxane-methylvinylsiloxane copolymer gum (weight average molecular weight=500000) end-capped by methylsiloxy group, 45 parts of BET surface area is 130m 2 / g of wet-process silica (Nipsil LP, a product of Silica Kogyo Kabushiki Kaisha, Japan), and 3 parts of hydroxyl-terminated dimethylsiloxane oligomers with a viscosity of 50 mPa·s. The resulting mixture was heated at 175°C for 60 minutes to form a silicone rubber base compound having a Williams plasticity of 260. Then, a molded silicone rubber sponge composition was prepared by uniformly mixing the following materials with 100 parts of a silicone rubber base compound on a two-roller mill: 1 part of trimethylsiloxy-terminated Dimethylsiloxane-methylhydroxysiloxane copolymer (the ratio of the number of mole...
Embodiment 3
[0035] Add the following materials into a kneading mixer and mix well: 100 parts of dimethylethylene composed of 99.85% (mol) dimethylsiloxane structural units and 0.15% (mol) methylvinylsiloxane structural units Dimethylsiloxane-methylvinylsiloxane copolymer gum (weight average molecular weight=500000) end-capped by methylsiloxy group, 45 parts of BET surface area is 130m 2 / g of wet-process silica (Nipsil LP, a product of Silica Kogyo Kabushiki Kaisha, Japan), and 3 parts of hydroxyl-terminated dimethylsiloxane oligomers with a viscosity of 50 mPa·s. The resulting mixture was heated at 175°C for 60 minutes to form a silicone rubber base compound having a Williams plasticity of 260. Then, a molded silicone rubber sponge composition was prepared by uniformly mixing the following materials with 100 parts of a silicone rubber base compound on a two-roll mill: 0.3 parts of o-methyl peroxide, 0.6 parts of dicumyl peroxide Base, and 1 part of hollow silicone resin powder prepared ...
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