JPS5936176A - Water-dispersed contact-type adhesive - Google Patents

Abstract

PURPOSE:To prepare the titled adhesive having long tack life and excellent bonding workability, and suitable for the bonding of thin polyolefin sheets, by dissolving a thermoplastic elastomer and a tackifier in an organic solvent, adding a surface active agent to the solution, and dispersing the mixture in water. CONSTITUTION:The objective adhesive can be prepared by dissolving (A) a thermoplastic elastomer having styrene content of 10-50pts. and an elongation of 500-1,500%, e.g. styrene-butadiene-styrene block copolymer and (B) a tackifier such as petroleum resin in (C) an organic solvent such as toluene, adding (D) a surface active agent such as a nonionic agent to the solution, and dispersing and emulsifying the mixture in water. The amount of the component (B) is preferably 30-150pts. per 100pts. of the component (A) in terms of the weight of the solid content. EFFECT:The problems of toxicity and fire hazard caused by organic solvent can be reduced. Since the adhesive has low visocisity and high solid content, a thick effective adhesive layer after drying and solidification can be attained at an ordinary amount of application.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water-dispersed adhesive suitable for polyolefin-based di-tri-adhesion.

Traditionally, contact type adhesives include solvent-based elastomer adhesives prepared by dissolving various elastomers and various tackifiers in organic solvents, or thermoplastic resins or thermoplastic elastomers and various tackifiers melted together. A hot-melt adhesive prepared by Therefore, the organic solvent type has problems with toxicity and fire hazards due to the organic solvent that scatters during manufacture and use, and hot melt type Odor-C requires heating during manufacture and use, and a special applicator ( A coating machine) was also required.

In addition, solvent-based adhesives have high viscosity and low solid content, resulting in a thin effective adhesive layer and poor peel adhesive strength, making them unsuitable for bonding sheets. The hot-melt type is unsuitable for bonding polyolefins with a low softening point because it adheres by heating.

An object of the present invention is to provide a water-dispersible adhesive that is easy to manufacture and use and can also adhere to polyolefin sheets.

The present invention is a water-dispersed contact adhesive in which a composition in which a thermoplastic elastomer and a tackifier are dissolved in an organic solvent and a surfactant is added is dispersed in water to form an emulsion.

The thermoplastic elastomer in the present invention refers to styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SI
S), styrene content of styrene-ethylene-styrene block copolymer (SEHS)irt1(
) to 50 parts of copolymer (- elongation 500 to 1500
% rubber-like elastic material, used as a modifier for permanent plastics, vulcanized rubber, asphalt, etc. Commercially available products include CARIFLEX TR and CLAY)') G
(manufactured by Shell Chemical Co., Ltd.), Tuffprene, Turprene, Asaprene (manufactured by Asahi Kasei Co., Ltd.), etc. As the tackifier, commercially available tackifiers such as hydrogenated rosin, hydrogenated rosin ester, polymerized rosin, polymerized rosin ester, 03-5 petroleum resin, and terpene phenol resin can be used. Suitable organic solvents include water-insoluble solvents such as aromatic solvents such as toluene and xylene, and chlorine solvents such as trichloroethylene and trichloroethane. As a surfactant, alkyl/I/
Anionic materials such as benzene sulfonic acid sorter, sulfuric acid ester sodium salt, naphthalene sulfonic acid sodium salt, nonionic threads such as polyethylene glycol lauriether, polyethylene glycol nonylphenylene ether, sorbitan monostearate 1, alkyltrimethylammonium chloride, polyoxy Various surfactants can be used, such as cationic surfactants such as ethylene alkylamine, and amphoteric ionic threads such as alkyl-Wbentine. For example, if you want to make the adhesive layer soft after solidification, you can increase the amount of thermoplastic elastomer, and if you want to make it hard, you can increase the amount of tackifier. 10 parts of thermoplastic elastomer (3 parts of tackifier to 1 part of mold weight)
0 to 150 parts, preferably 50 to 100 parts], the adhesive obtained by emulsifying the composition exhibits excellent performance as a universal adhesive in terms of adhesive retention time, adhesive strength, heat-resistant adhesive strength, etc. A water-dispersible adhesive suitable for

The water-dispersed adhesive of the present invention has low toxicity and fire danger due to organic solvents, can be applied with a regular applicator, has a long adhesive retention time, and has excellent adhesive workability using a hour wheel. Due to its low viscosity and high solid content, the effective adhesive layer after drying and solidification becomes thick even with the same coating amount, and it has appropriate flexibility and adhesive strength, so it can also be used as an adhesive for thin polyethylene and polypropylene nato polyolefin sheets. Useful as a suitable all-purpose adhesive.

Next, the present invention will be explained by examples. Parts indicate parts by weight.

Example 1 50 parts of toluene, 50 parts of Kraton G1650 (Shell Chemical Co., Ltd. 91), which is a styrene-ethylene-butyne-styrene block copolymer (5EBS), and Toho Hi-Resin 120 (Toho Oil Resin Co., Ltd.), which is a petroleum resin (tackifier). 50 mK'gA (manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) was added, dissolved at 50''C, heated to 60°C, and 3 parts of Hitenor 7I/325'0 (manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), a nonionic surfactant, was added. , Gradually add 100 parts of water while stirring at high speed with a homogenizer, cleave for about 1 hour to form an emulsion, solid content 4()%, viscosity 4500 c p / 20' c
The water-dispersed adhesive of rv Example 1 was obtained.

Comparative Example 1 100 parts of Kraton G 1650 and 100 parts of Toho Hi Resin 120 were heated and melted and mixed at 150°C to obtain a hot melt adhesive of Comparative Example 1 having a viscosity of 50C100C1ll/150°C.

Comparative Example 2 20 parts of Kraton 01650 and 20 parts of Toho High Resin 120 were mixed and dissolved in 0 parts of toluene (2C) to give a solid content of 20% and a viscosity of 40 (1 (l OCI) / 20).
A solvent-based adhesive of Comparative Example 2 was obtained.

Next, using the adhesives of Example 1 and Comparative Examples 1 and 2,
．． 8fiFJ Polypropylene (PP) Sea 1 Comrade,
0.8 MM thick polyethylene (PE) sheets, 0
．． A 5-part m-thick canvas and a 1.6-m thickness iron plate were each glued together. The conditions were coating, t120g/i (coating on both sides), drying at 4Q'c for 10 minutes, and then bonding. However, the temperature of the hot melt adhesive of Comparative Example 1 is 150°C.
°Apply with a licator 1. Ta. Table 1 shows the results of determining the adhesion state and 180 degree peel adhesive strength after being left at room temperature for 2 days after adhesion.

Claims (1)

[Claims] A water-dispersed contact adhesive characterized in that a thermoplastic elastomer and a tackifier are dissolved in an organic solvent, a surfactant is added, and a composition is dispersed in water to form an emulsion.