ADHESIVE FOR OPTICAL COMMUNICATION COMPONENT PART

摘要

PROBLEM TO BE SOLVED: To provide an adhesive that is excellent in a long-term stability and capable of adhering at a low temperature by constituting the adhesive of an aqueous alkali silicate solution, preferably an aqueous sodium silicate solution or an aqueous potassium silicate solution and an inorganic powder. SOLUTION: An aqueous alkali silicate solution is dried and hardened at a low temperature by reacting with an inorganic powder to produce a stable hardened product. In addition, a thermal expansion coefficient can be controlled by selecting the concentration or the kind of the solution. An aqueous alkali silicate solution in which a H2O concentration is 30-95 wt.% and a molar ratio of SiO2/R2O is about 1.5-5 can be preferably used. An inorganic powder is a component for forming a stable hardened layer by reacting with an alkali silicate and comprises a crystalline powder, a crystallizable glass powder, an amorphous glass powder or the like. A crystallizable glass powder containing Li is particularly preferable. A mixing ratio by weight of an aqueous alkali silicate solution to an inorganic powder is preferably 1 to 0.5-3.