Silicone gel composition and cured product thereof, and power module

A silicone gel composition comprising:

• (A) 100 parts by weight of an organopolysiloxane having at least one alkenyl group bonded to silicon atom in one molecule,
• (B) an organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule comprising the following component (b-1) and component (b-2) in an amount such that hydrogen atoms bonded to silicon atoms in the whole component (B) are 0.01 to 3 mol per 1 mol of alkenyl groups in the component (A),
• (b-1) an organohydrogenpolysiloxane having at least three hydrogen atoms bonded to silicon atoms in one molecule, represented by the average composition formula (1):
• (R23SiO1/2)b(R22SiO)c(HR2SiO)d (1)
• wherein each of R2s represents the same or different monovalent hydrocarbon group, b is a positive number of 0.01 to 0.3, c is a positive number of 0.2 to 0.89, d is a positive number of 0.1 to 0.7, and b+c+d=1,
• (b-2) an organohydrogenpolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule, represented by the average composition formula (2):
• R3eHfSiO(4-e-f)/2 (2)
• wherein R3s is independently an unsubstituted or substituted monovalent hydrocarbon group free of an aliphatic unsaturated bond, e is a positive number of 0.7 to 2.2, and f is a positive number of 0.001 to 0.5, provided that e+f is 0.8 to 2.5,
• provided that excluding the organohydrogenpolysiloxane of the component (b-1),
• (C) effective amount as a catalyst of a platinum group metal-based curing catalyst,
• (D) 0.01 to 3 parts by weight of an isocyanuric acid derivative having two trialkoxysilyl groups and one alkenyl group or one hydrogen atom bonded to a silicon atom (SiH group) in one molecule, and/or an isocyanuric acid derivative having three trialkoxysilyl groups in one molecule, and
• (E) 0.01 to 10 parts by weight of one or more alkoxysilyl group-containing ketene silyl acetal compounds having the general formula (3) and/or a partial hydrolytic condensate thereof:
• wherein R4 and R5 are alkyl groups having 1 to 4 carbon atoms, R6 is an alkyl group having 1 to 12 carbon atoms, R4, R5 and R6 may be the same or different groups each other, and n is 0 or 1,
• which is cured to provide a silicone gel cured product having a penetration of 30 to 70 according to JIS K2220.