Emulsion composition for silicone rubber, process for producing the same, and process for producing silicone rubber
View Patent ↗A silicone rubber emulsion composition comprising (A) 100 parts diorganopolysiloxane having at least two silicon-bonded alkenyl groups, (E) 0 to 60 parts reinforcing silica filler, (B) 10 to 250 parts water containing a smectite clay, (C) 0.1 to 15 parts emulsifier, and (D) a cross-linking agent (e.g., an organohydrogenpolysiloxane) in an amount sufficient for cross-linking component (A) and a catalyst (e.g., a platinum-type catalyst). A method for preparing the aforementioned emulsion composition comprising mixing components (A) and (E) with other components in a high-speed stirrer-equipped mixer. A method of manufacturing a silicone rubber comprising either heating and dehydrating the aforementioned emulsion composition.
1. An emulsion composition for manufacturing a silicone rubber, said emulsion composition comprising:
(A) 100 parts by weight of a diorganopolysiloxane having at least two silicon-bonded alkenyl groups in a molecule;
(B) 10 to 250 parts by weight of water that contains a smectite clay;
(C) 0.1 to 15 parts by weight of an emulsifier;
(D) (d1) a cross-linking agent in an amount sufficient for cross-linking component (A), and
(d2) a catalyst; and
(E) 0 to 60 parts by weight of a reinforcing silica filler.
2. The emulsion composition for manufacturing a silicone rubber according to claim 1 , wherein said smectite clay is a synthetic saponite.
3. The emulsion composition for manufacturing a silicone rubber according to claim 1 , wherein said component (B) contains said smectite clay in the amount of 1 to 10 parts by weight per 100 parts by weight of said water.
4. The emulsion composition for manufacturing a silicone rubber according to claim 1 , wherein said emulsifier of component (C) comprises a non-ionic surface-active agent.
5. The emulsion composition for manufacturing a silicone rubber according to claim 1 , wherein component (d1) is an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, and wherein component (d2) is a platinum-type catalyst.
6. The emulsion composition for manufacturing a silicone rubber according to claim 2 , wherein said component (B) contains said synthetic saponite in the amount of 1 to 10 parts by weight per 100 parts by weight of said water.
7. The emulsion composition for manufacturing a silicone rubber according to claim 2 , wherein said emulsifier of component (C) comprises a non-ionic surface-active agent.
8. The emulsion composition for manufacturing a silicone rubber according to claim 2 , wherein component (d1) is an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, and wherein component (d2) is a platinum-type catalyst.
9. The emulsion composition for manufacturing a silicone rubber according to claim 1 , wherein the emulsion composition comprises a pre-mixture of component (A) and component (E).
10. The emulsion composition for manufacturing a silicone rubber according to claim 9 , wherein component (E) is a hydrophobically surface-treated reinforcing silica filler.
11. The emulsion composition for manufacturing a silicone rubber according to claim 9 , wherein said smectite clay is a synthetic saponite.
12. The emulsion composition for manufacturing a silicone rubber according to claim 9 , wherein said component (B) contains said smectite clay in the amount of 1 to 10 parts by weight per 100 parts by weight of said water.
13. The emulsion composition for manufacturing a silicone rubber according to claim 9 , wherein said emulsifier of component (C) comprises a non-ionic surface-active agent.
14. The emulsion composition for manufacturing a silicone rubber according to claim 9 , wherein component (d1) is an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, and wherein component (d2) is a platinum-type catalyst.