JPS6232163A - Adhesive and bonding method - Google Patents

Abstract

PURPOSE:To provide an adhesive which has excellent environmental stability and resistance to moisture and heat and can be bonded at a relatively low temp., containing fine glass particles and a metal alkoxide. CONSTITUTION:Fine glass particles (e.g. PbO/ZnO/B2O3 glass particles) having a particle size of 5mum, an alkoxide of at least one metal selected from among metals constituting said glass and Si (e.g. Pb ethoxide) and an org. solvent (e.g. isopropyl alcohol) are mixed together to obtain a paste adhesive. The adhesive is applied to an adherend surface and heated at 70-100 deg.C to hydrolyze the metal alkoxide by the action of water in air, thus forming a metal hydroxide. The resulting mixture of the metal hydroxide and the fine glass particles is heated until the metal hydroxide is converted into an oxide by repeating the dehydration and the polycondensation of the metal hydroxide to cure and bond the adhesive. The adhesive is heated at a temp. of not lower than the m.p. of the glass particle to weld the adherend through a glass film.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an adhesive that cures and ages by changing hydroxide to oxide. The present invention relates to an adhesive containing an alkoxide as a constituent, and a bonding method using the same.

[Conventional technology] Conventional organic adhesives have the advantage of good workability and flowability and can be used at low temperatures, but on the other hand, they have many problems in terms of environmental stability due to their moisture resistance and heat resistance. Ta. Furthermore, although glass welding, which is bonding using inorganic adhesives, has excellent environmental stability, it requires a heat source that supplies high temperature to melt the glass, and there are problems in use such as glass flow during melting. There were many.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems, and its purpose is to provide an adhesive method and adhesive that do not require high temperatures and yet can provide a highly durable bond. Our goal is to provide the following.

[Means for Solving the Problems] The above-mentioned object of the present invention is to provide an adhesive comprising glass fine particles, a metal alkoxide of at least one of the constituent metals of the glass and silicon, and the adhesive. This is achieved by an adhesion method characterized in that the metal alkoxide is brought into contact with the adhesion surface and heated to hydrolyze the metal alkoxide and change it into a hydroxide, and then further heated to change it into an oxide and harden the adhesion.

Further, the metal alkoxide which is a constituent component of the present invention is a metal alkoxide and/or a silicon alkoxide forming the glass fine particles. This alkoxide is made from any alcohol, and various forms of bonding with the metal and silicon can be used.

A specific form of the adhesive of the present invention is a paste-like mixture of glass fine particles and one or more of the above-mentioned alkoxides mixed in an organic solvent.

The solvent mixed into the adhesive of the present invention is an alcohol obtained by hydrolyzing the metal alkoxide described above, and one type or a mixture of two or more types of commonly used solvents. The content of this solvent is adjusted so that the adhesive of the present invention has an appropriate viscosity.

This adhesive is used as follows.

That is, after the adhesive of the present invention is applied or brought into contact with a surface to be bonded by another method, the metal alkoxide as a constituent component of the adhesive is hydrolyzed to form a hydroxide of the metal as the main component. Heat at a temperature of 70-100°C. This hydrolysis is performed using moisture in the air. For further drying, heating needs to be carried out for a sufficient period of time.

Next, the obtained mixture of metal hydroxide and glass fine particles is further heated until the metal hydroxide changes into an oxide through repeated dehydration and polycondensation. The same substance as some components of glass fine particles obtained as an oxide, or 5
102 connects the glass particles together and causes an adhesive action.

Further, bonding can be performed by combining the above bonding step and glass welding.

That is, after the metal alkoxide is converted into an oxide and placed in a curing bath, it is further heated to a temperature equal to or higher than the melting point of the glass particles to be welded. Although this method ultimately requires melting, it can be used in cases where bonding must be performed at a relatively low temperature before melting.

In the above method, not only the glass particles but also all the oxides from the metal alkoxide may be heated to a temperature at which they are welded.

The above-described bonding method can be used not only for bonding two or more objects, but also for surface coating, adhesive bonding, filling bonding, and the like.

[Example] Example 1 Glass fine particles (particle size 0.5 μtl) consisting of PbO, '2nO, E, o3 (=70/20/10) and isopropyl alcohol solution of pb ethoxide (20/80
(weight ratio) was uniformly mixed at a ratio of (20/80 weight ratio). Spread this mixture on a glass plate to a thickness of about 0.05 m.
, m. This mixture was heated to 85°C.
When heated at , hydrolysis of pb ethoxide started,
After heating for about 120 minutes, this was further heated at 150°C for 120 minutes.
When heated for a minute, Pb2 reverses dehydration and polycondensation and is oxidized to PbO.
An enamel-like glass film was adhered to the surface made of ZnO and B2O3.

Example 2 Fine glass particles (particle size 0.5 μm) made of Pb0,2nO, B203 (□70/20/10) and an isopropyl alcohol solution of Si ethoxide (20/80 weight ratio) were mixed (20/80 weight ratio) were mixed uniformly at a ratio of This mixture was uniformly applied onto a glass plate to a thickness of about 0.05 mm. When this mixture was heated at 85°C, hydrolysis of Si ethoxide started and approximately 12
After heating for 0 minutes, when this is further heated at 150°C for 120 minutes, Si(Ko)4 undergoes repeated dehydration and polycondensation and is oxidized to become 5in2, and 5i02. P
b0.2nO.

An enamel-like glass film had adhered to the surface made of B2O3.

Example 3 The glass film made in [Example] was further treated with this pbo.

It was heated for 20 minutes at a temperature of 700° C. at which glass fine particles made of 2nO, E+03 melt.・P on the glass plate
A glass film composed of bO, 2nO, and B2O3 with better growth properties had already adhered.

Example 4 The glass film made in Example 2 was further coated with this 5102 and P.
It was heated for 20 minutes at a temperature of 900° C. at which all the glass microparticles forming b0.2nO9B20 were melted. On the glass plate is a 5in2. A very young glass film consisting of PbO, 2nO, and B2O3 had already adhered.

[Effects of the Invention] As described above, by performing the above-described bonding using the adhesive of the present invention, bonding with an adhesive mainly composed of glass can be performed at a relatively low temperature, and the adhesive can be bonded before glass welding. It has the effect of allowing step-by-step adhesion.

Claims (1)

[Scope of Claims] 1. An adhesive characterized in that its main constituents are fine particles of glass and an alkoxide of at least one metal among the constituent metals of the glass and silicon. 2. A composition containing fine glass particles and an alkoxide of at least one metal among the constituent metals of the glass and silicon is brought into contact with the adhesive surface and heated, thereby hydrolyzing the metal alkoxide and producing water. An adhesion method characterized by converting it into an oxide and then heating it to convert it into an oxide and curing the adhesive. 3. Adhesion method according to claim 2, characterized in that after the metal alkoxide is converted into an oxide and cured and bonded, the metal alkoxide is further heated to a temperature equal to or higher than the melting point of the glass particles for welding. The bonding method according to claim 2, characterized in that after being converted into an oxide and cured and bonded, the bonding method is further heated to a temperature equal to or higher than the melting point of the oxide and the glass particles for welding.