Bonding method employing an inorganic adhesive composition
AssigneeNissan Chemical Industries, Ltd.
InventorsKen-ichi Okubi, Akita Kitajima, Hisayuki Sato, Kiyomi Ema
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Abstract
Disclosed is an inorganic adhesive composition comprising (a) an aqueous silica sol and (b) an inorganic refractory powder along with one or more material selected from (c) a fine powdery silica, (d) an aqueous alkali silicate solution and (e) a silane coupling agent. After hardening, the hardened product of the composition displays noticeably improved adhesion strength and electric insulating property.
Claims6
A method of bonding together materials of the same kind or different kinds selected from the group consisting of ceramics, glass, slates, hardened cement products and metal materials, comprising (1) putting between and in contact with two adjacent surfaces of said materials an adhesive composition comprising:
- (a) an aqueous silica sol having a mean particle size of from 5 to 200 millimicrons and a molar ratio of SiO.sub.2 /M.sub.2 O (where M represents an alkali metal atom, an amine molecule, or a quaternary ammonium group) of from 30 to 2000, in an amount of 100 parts by weight as SiO.sub.2 ;
- (b) an inorganic refractory powder having a particle size of from 0.5 to 1000 microns, in an amount of from 100 to 100000 parts by weight;
- (c) a fine powdery silica in amorphous form having a particle size of from 5 to 200 millimicrons, in an amount of from 0.5 to 500 parts by weight;
- (d) an aqueous solution of an alkali silicate having a molar ratio of SiO.sub.2 /M'.sub.2 O (where M' represents Na, K, Li, an amine molecule, or a quaternary ammonium group) of from 1 to 30 and having an alkali silicate concentration of from 1 to 60% by weight, in an amount of from 0.1 to 500 parts by weight as the alkali silicate component;
- and
- (e) one or more coupling agents selected from the group consisting of a silane compound of a general formula (I):
- R.sup.1 Si(OR).sub.3 (I)
- where OR represents an alkoxy or acyloxy group having from 1 to 3 carbon atoms, and R.sup.1 represents a monovalent organic group having from 2 to 9 carbon atoms, or a hydrolysate thereof, and a silane compound of a general formula (II):
- R.sup.1 SiCH.sub.3 (OR).sub.2 (II)
- where
- OR and R.sup.1 have the same meanings as defined above, or a hydrolysate thereof, in an amount of from 0.05 to 100 parts by weight;
- the solid content of the components (a), (b), (c), (d) and (e) being from 40 to 95% by weight;
- said composition having a viscosity of from 1 to 10000 poise at 20.degree. C.;
- (2) drying and hardening said composition between said surfaces at a temperature higher than the freezing temperature of the composition not to exceed 300.degree. C.
Dependencies are inferred from the claim text.