JPS627779A - Corrosion-resistant photosetting adhesive composition - Google Patents

Abstract

PURPOSE:The titled ultraviolet-curing composition suppressing corrosion of metal in a hihg-temperatue, high-humidity atmosphere, exerting desired bond strength in a short time, obtained by blending optically and radically polymerizable varnish of acrylic type with a soluble epoxy prepolymer. CONSTITUTION:An optically and radically polymerizable varnish of acrylic type(preferably consisting of acrylic monomer, high polymer thickening agent and ultraviolet light initiation catalyst) is blended with an epoxy prepolymer soluble in the varnish.

Description

[Detailed description of the invention] Industrial applications The present invention relates to ultraviolet curable adhesives.

Conventional Technology When at least one of the adherends has a transparent material such as glass or plastic, it is efficient to use an adhesive that hardens when irradiated with ultraviolet rays. is well known.

(For example, “UV, KB Curing Technology n @ Published by Sogo Technological Center, 557) Problems to be Solved by the Invention One of the problems with using such conventional adhesives is that at least part of the adherend is made of metal. If the bonded material is exposed to hot and humid conditions, the adhesive may accelerate corrosion, especially if it is a thin metal layer such as one formed by vapor deposition. There have been many reports of this, and there have been no effective measures to deal with this serious problem.

Means for Solving the Problems The anticorrosive photocurable adhesive composition of the present invention is a mixture of an acrylic photoradically polymerizable varnish and an epoxy prepolymer that can be dissolved therein.

In other words, when bonding a corrosive metal or a base material with a metal layer to a transparent substrate, it is possible to bond rapidly and firmly using ultraviolet rays, and the bond does not accelerate metal corrosion even under high temperature and humidity. can provide the agent.

Example Hereinafter, the present invention will be specifically explained with reference to Examples.

FIG. 1 illustrates a state in which a base material 1 having a metal layer 2 on its surface and a transparent substrate 4 are bonded together with an adhesive 3 using a cross-sectional view. In this case, the ultraviolet rays pass through the transparent substrate 4 and reach the adhesive 3. The manner in which corrosion of the metal layer 2 progresses varies depending on the materials of the transparent substrate 4 and the base material 1. If these are materials that allow moisture to pass through, full-scale corrosion is likely to occur.
If moisture is not permeable, corrosion will occur due to moisture intrusion from the edges.

Example 1 Polyester type polyfunctional acrylate (product name: KAYA
RAD HX-820, manufactured by Nippon Kayaku ■) 100g of acrylic photo-radically polymerizable varnish in which 1g of benzyl dimethyl ketal was dissolved, the epoxy equivalent was 180.
5 gr of ~2o○ bisphenol A epoxy resin
It was dissolved to form an adhesive composition. In order to evaluate the performance of the adhesive, as shown in the figure, a methacrylic resin base material 1 with a thickness of 1fl on which metallic tellurium 2 was vapor-deposited to a thickness of 0.1 μm, and a transparent methacrylic resin substrate 4 with a thickness of 1fl were prepared. Adhesion was made using the adhesive composition of the example. The bonding conditions were that the ultraviolet energy on the surface of the transparent plate 4 was 300 mJ/ffl, and the thickness of the adhesive 3 was 0.1 m. The thus prepared adhesive sample was left at 70° C. and 90% RH for 100 hours, and changes were observed. The results are shown in the table.

Example 2 Polyester type polyfunctional acrylate (product name: KAYA
RAD HX-220, manufactured by Nippon Kayaku ■) 100 gr, acrylic resin for paint (product name: Dianaru B)
10g of R-64 (manufactured by Mitsubishi Rayon ■) was dissolved, and 1g of benzyl dimethyl ketal was dissolved therein. To this acrylic photoradically polymerizable varnish, 1 portion of bisphenol A epoxy resin having an epoxy equivalent of 450 to 500 was added.
gr was dissolved to obtain an adhesive composition. To evaluate the performance of the adhesive composition, an adhesive sample was prepared under the same configuration and conditions as in Example 1, and was prepared at 70'C-90% un, 1o.

Observe the changes over time. The results are shown in the table.

Example 3 Consisting of 50 gr of tetrahydrofurfuryl acrylate), polyester type polyfunctional acrylate (trade name NiMAID Jin9 manufactured by Nippon Kayaku) sogr, acrylic resin for paint DIANAL BR-5410 gr, and benzyl dimethyl ketal 1 gr. Side chain type flexible epoxy resin (product name: 'H
P-4000. (manufactured by Asahi Denka Kogyo ■) was dissolved in an amount of 5 gr to prepare an adhesive composition. In order to evaluate the performance of the adhesive composition, adhesive samples were prepared with the same configuration and conditions as in Example 1, and changes were observed after 100 hours at 70° C. and 90% RH. The results are shown in the table.

Example 4 50 g of tetrahydrofurfuryl acrylate (and polyester type polyfunctional acrylate), (MANDA) 50 g
r, plus 15 gr of diallyl phthalate prepolymer
For an acrylic photoradical polymerizable varnish consisting of 1gr of benzyl dimethyl ketal and
200 bisphenol A type epoxy resin was dissolved to form an adhesive composition.

For evaluation of adhesive adhesion, adhesive samples were prepared using the adhesive under the same configuration and conditions as in Example 1, and heated at 70°C-9.
Changes were observed after 0 hours RH and 100 hours. The results are shown in the table.

Comparative Example 1 Polyester polyfunctional acrylate (HX-220) 10
Using an acrylic photoradically polymerizable varnish in which 1 gr of benzyl dimethyl ketal was dissolved in 0 gr as an adhesive, an adhesive sample was prepared with the same configuration and conditions as in Example 1, and this was heated at 70'C and 90% RH. It was left to stand for 100 hours and changes were observed. The results are shown in the table.

Comparative Example 2 The table shows the observation results after a methacrylic resin substrate on which metallic tellurium was deposited to a thickness of 0.1 μm was left at 70° C. and 90° RH for 100 hours.

(Table) Observation results after 100 hours at 70'C - 90% RH Effects of the invention The anticorrosive photocurable adhesive according to the invention has the effect of suppressing metal corrosion in a high temperature and humid atmosphere, and It has the excellent effect of achieving the desired adhesive strength in a short period of time.

[Brief explanation of the drawing]

The figure is a cross-sectional view illustrating a state in which a base material on which a metal film is formed and a transparent substrate are bonded together. 1... Base material, 2 - Metal layer, 3 Adhesive, 4...
...Transparent substrate.

Claims (3)

[Claims] (1) An anticorrosive photocurable adhesive composition prepared by mixing an acrylic radical photopolymerizable varnish with a soluble epoxy prepolymer. (2) The anticorrosive photocurable adhesive composition according to claim 1, wherein the acrylic radical photopolymerizable varnish comprises an acrylic monomer and an ultraviolet initiation catalyst. (3) The anticorrosive photocurable adhesive composition according to claim 1, wherein the acrylic radical photopolymerizable varnish comprises an acrylic monomer, a polymer thickener, and an ultraviolet initiation catalyst.