Silicone resin composition
View Patent ↗This invention provides a silicone resin composition giving a silicone cured rubber exhibiting a higher elongation percentage as well as improved heat resistance, oil resistance and chemical resistance, which are particularly required for automobile applications. A silicone cured rubber meeting the above physical property requirements can be prepared by moisture-curing a silicone resin composition including 100 wt parts of (a) an OH-containing polysiloxane, 0.1 to 200 wt parts of (b) a carbodiimide and (c) an organosilicon crosslinking agent, or alternatively by thermally curing a silicone resin composition including 100 wt parts of (a) an OH-containing polysiloxane, 0.1 to 200 wt parts of (b) a carbodiimide and (d) an amino-containing silane.
1. A silicone resin composition comprising:
100 wt parts of Component (a): an OH-containing polysiloxane;
0.1 to 200 wt parts of Component (b): a carbodiimide; and
Component (d): an amino group-containing silane.
2. The composition as claimed in claim 1 wherein the amount of Component (d) is 0.01 to 100 wt parts to 100 wt parts of Component (a).
3. The composition as claimed in claim 1 wherein the OH-containing polysiloxane is a polysiloxane represented by general formula (I):
wherein R 1 , R 2 and R 3 are independently selected from the group consisting of H, OH and monovalent hydrocarbon groups optionally substituted with fluorine, in addition, R 1 s and R 2 s attached to different Si atoms may be different groups; R 4 is selected from the group consisting of H and monovalent hydrocarbon groups optionally substituted with fluorine; provided that when R 4 is a monovalent hydrocarbon group optionally substituted with fluorine, at least one of all R 1 s and R 2 s and R 3 is OH; n is selected such that a viscosity at 25° C. is within the range of 10 to 10,000,000 cps.
4. The composition as claimed in claim 3 wherein the OH-containing polysiloxane is an OH-terminated polysiloxane which is represented by formula (I) in which R 1 and R 2 are H or monovalent hydrocarbon group, R 3 is OH, and R 4 is H.
5. The composition as claimed in claim 3 wherein the OH-containing polysiloxane is an OH-terminated polydimethylsiloxane which is represented by formula (I) in which R 1 and R 2 are methyl, R 3 is OH, and R 4 is H.
6. The composition as claimed in claim 1 wherein the carbodiimide is a polycarbodiimide.
7. The composition as claimed in claim 1 wherein the amino-containing silane is a silazane or an amino-containing silane coupling agent.
8. A silicone resin cured product prepared by thermally curing the composition as claimed in claim 1 .
9. A multi-pack silicone resin composition set which are stored as two or more divided packs which are mixed before use to give the composition as claimed in claim 1 .