JPS60252672A - Aqueous adhesive - Google Patents

Abstract

PURPOSE:An aqueous adhesive, obtained by incorporating an acrylic based emulsion type aqueous adhesive with a basic methine based dye, and capable of producing remarkable effect on elimination of separation of the dye or surface staining, etc. even in a porous material. CONSTITUTION:An aqueous adhesive obtained by adding a mixture of one or two or more of basic methine based dyes in an amount within 0.001-0.1wt% range to an ordinary acrylic emulsion. Not only one-pack type but also two- packed type may be obtained. In this case, the basic methine based dyes are preferably incorporated with a crosslinking agent or gelling agent.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an aqueous adhesive, and more particularly to an acrylic emulsion type one-component or two-component aqueous adhesive colored by blending a specific dye.

Prior Art and Problems to be Solved Conventionally, for various adhesives, techniques have been developed to determine and confirm the distribution of the adhesive on the surface to ensure uniform application.
In addition, especially in the case of a two-component type adhesive, in order to distinguish and confirm the state at the time of mixing and ensure uniform mixing, it is usually required to color the adhesive by adding a dye or pigment as a coloring agent. Oil-soluble dyes are used in solvent solution type adhesives, and there are no particular problems, but in the case of emulsion type (or water dispersion type) water-based adhesives, in addition to the fact that the dye used is water-soluble, there are also problems with the dispersion resin. Due to the mutual relationship between the dye and the resin due to compatibility, etc., if the dye separates by oral administration after forming a film and causes chalking, or especially if at least one of the materials to be adhered is porous, it may be difficult to Due to aging under normal environmental conditions, such as peeling and drying, the dye migrates through the porous material and separates from the bonded surface, causing the surface to discolor.
It is recognized that phenomena such as contamination occur.

Therefore, the present inventors have conducted extensive research to solve these problems, and found that if a methine compound dye, in particular, is used as a coloring agent for an acrylic emulsion type water-based adhesive, It was discovered that the above-mentioned problems such as separation of the dye and surface contamination can be eliminated, and the present invention has been completed.

That is, the present invention is an acrylic emulsion type water-based adhesive that is characterized by containing a basic methine dye, which can have a remarkable effect especially when at least one of the materials to be adhered is a porous material. The present invention provides water-based adhesives.

Structure and Effects of the Invention As the main component resin emulsion used in the present invention, a normal acrylic emulsion may be adopted.
Included are acrylic resins or acrylic resin copolymer emulsions having a glass transition temperature of O'C or lower, which are generally referred to as acrylic emulsions, acrylic-styrene copolymer emulsions, acrylic-vinyl acetate copolymer emulsions, and the like. Specifically, acrylic acid, methacrylic acid,
Acrylic acid alkyl esters (methyl, ethyl, butyl, propyl, isopropyl, ethylhexyl, etc.), methacrylic acid alkyl esters (methyl, ethyl, phthyl apropyl, hexyl, etc.).

esters such as ethylhexyl and lauryl, or a mixture of two or more thereof, and copolymerizable esters such as vinyl acetate, ethylene, propylene, styrene, vinyl chloride, vinyl chloride, and acrylonitrile. It is an emulsion obtained by emulsion polymerization of -.

Although the detailed structure of the basic methine thread dye used in the present invention is not certain, for example, the "New Edition Dye Handbook" edited by the Organic Synthetic Chemistry Association (published by Maruzen Co., Ltd.),
Basic dyes having a basic skeleton represented by the formula (see page 13 of the above-mentioned document) are included. in particular,
C.I.

Ba5ic Red 14. C,1,Ba5ic R
ed 35, C9I.

13asic Red 35. C, I, Ba5ic
Red 37, C, I.

Ba5ic Violej 15. C,1,Ba5i
c Violet 27゜Diacryl 5upra
Br1lliant Red 2G (Mitsubishi registered trademark), Diacryl 5upra Br1llia
nt Red3B (Mitsubishi registered trademark), CHI, B
a5ic Red 78°CJ, Ba5ic Oran
ge27. C;, I, Ba5ic Blue69
One type or a mixture of two or more of these can be used. The amount used is usually 0.000 of the total amount of adhesive.
5 to 0.5% (weight%, the same applies hereinafter), preferably 000
It may be selected within the range of 1% to 0.1%. 0.00.05%
If it is less than 0.5%, the dyeability is poor, and if it exceeds 0.5%, it tends to be difficult to put it into practical use because it tends to be expensive from an economic point of view.

The water-based adhesive according to the present invention is prepared by blending a predetermined amount of basic methine thread dye into the above-mentioned acrylic emulsion, and adding conventional preservatives, thickeners, antifreeze agents, pH adjusters, and antifoaming agents as necessary. It is composed of an appropriate amount of tackifier resin, etc. In addition, the adhesive of the present invention is not limited to the one-component type, but may also contain a crosslinking agent suitable for acrylic emulsions (magnesia, soda carbonate, amine, amide compound, etc.).
Alternatively, it also includes a two-component type in which a gelling agent such as a polyvalent metal salt is combined. The two-component type is particularly advantageous when used in an atmosphere with harsh environmental conditions such as hot and cold heating and dry and wet heating, and the good resistance of the basic methine dye can be utilized. It will be done. In addition, in the case of a two-component type, the basic methine yarn dye may be generally blended with a crosslinking agent or a gelling agent.

The adhesive materials of the present invention include metals,
Non-porous materials such as plastic or porous materials such as expanded plastic foam, cloth, breathable plastic film, felt, non-woven fabric, plywood, glass fiber, glass wool, and asbestos fibres. In the present invention, a remarkable effect can be achieved when at least one of the materials to be adhered is a porous material. Application areas of the adhesive of the present invention include interior finishing materials for automobile interiors (particularly ceiling panels), trims, air conditioners, insulation materials for vending machines, and furniture fittings.

According to the adhesive of the present invention having the above configuration, all problems such as separation of colored dyes and discoloration and contamination of the adhesive surface are solved,
Uniform application and uniform mixing for the purpose of dye use can be sufficiently achieved.

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

Examples 1 to 4 and Comparative Example 1 A two-component acrylic emulsion type water-based adhesive consisting of a base agent and a gelling agent (manufactured by Sunstar Giken Co., Ltd., Penguin Bond #
Add 0.0 of the basic methine dye or comparative dye (azo yarn dye) shown in Table 1 to the gelling agent of 1 '23 OA).
Add 5% and dissolve.

Next, apply 1 base agent to both IJs using a 2-head airless spray gun.
A coating amount of 4.00 to 100 gelling agent was applied to the urethane foam (12X9X0.5a) of the nylon nonwoven fabric/urethane foam laminate by mixing in the air. sog
/m or 600g/m and immediately adhered to the center of an electrodeposition coated plate C15C15X10 to prepare a test piece. After drying at room temperature for 24 hours, the test piece curved with a radius of curvature of 100 mm is held horizontally with the nonwoven fabric side facing down, and left in an atmosphere at a temperature of 50°C and humidity of 95%. The condition after 24 hours in such a promoting atmosphere was observed with the naked eye, and the results are shown in Table 1 (○: dye separation angle contaminated, ×: dye separation, stain!ll).

Table 1 [Note] The two-component acrylic emulsion type water-based adhesive used had the following composition.

Main ingredient: Freimar 580 (Rohm & Haas)
Company) Gelling agent 10% by weight aqueous solution of polyvalent metal salt of diamino acid

Claims (1)

[Claims] 1.7 In the emulsion type water-based adhesive,
A water-based adhesive characterized by containing a basic methine dye.