SU1680745A1 - Glue for adhesive tape - Google Patents

Abstract

The invention relates to the field of producing adhesives for adhesive tapes on a polyethylene terephthalate basis and can be used in the chemical-photographic industry. The invention makes it possible to increase bonding strength, resistance to the effects of chemical-photographic solutions and to increase the service life of the tape due to the use of synthetic isoprene rubber as synthetic rubber and the additional content of natural rubber and 2,2-dimethoxy-2-phenyl acetophenone. The adhesive contains, in wt.%, Butadiene-ethanol thermoplastic elastomer 4.5-5.5; natural rubber 2.5-3.5; synthetic isoprene rubber 1 6 2.4; indenomeric acid resin 0.7-1.3; glycerol ester of rosin 4,5 -5,5; rosin 4.5 -5.5; titanium dioxide 2.3-2.7, 2,2-dimethoxy-2-phenylacetophenol 0.07–0.30, the solvent is the rest. 2 tabl

Description

The invention relates to adhesive formulations for polyethylene terephthalate-based adhesive tapes and can be used in the chemical and photographic industry.

The purpose of the invention is to increase the bonding strength, resistance to the effects of chemical-photographic solutions and increase the service life of the tape,

In the composition are used: butadiene styrene thermoplastic elastomer DST-30, resin indene-coumarone grade A with a softening temperature of 140 ° C. rosin, 2,2-dimethoxy-2-phenylacetophenone. which is obtained by

the interaction of benzyl with methanol in the environment of thionyl chloride at 4 ° C.

Sample No. 1 (known) is prepared as follows. A pre-crushed copolymer of butadiene, acrylonitrile and 2-cyanoethyl methacrylate — 2.5% by weight, a mixture of solvents (toluene, butyl acetate and acetone in the ratio of 3.31-1) - 40, are loaded into a mixer with Z-shaped blades. 00 May%. The solvent mixture is prepared in a known manner with mechanical stirring. The contents are mixed until the copolymer is completely dissolved. Then the glycerin ester of rosin — 7.65 wt.%; Divinyl-styrene thermoplastic elastomer — 10.2 wt.%; Chloroparaffin — 1.28 May. %, titanium dioxide - 2.56 wt.%. mixture of solvents (toluene

About 00

about

Ј

ate

butyl acetate and acetone at a ratio of 3.3: 1: 1) —– 35.81 wt.% and stirred until all components are completely dissolved and a homogeneous system is obtained. The resulting adhesive with a viscosity according to VZ-4 140-150 s is applied on a polyethylene terephthalate base in a known manner, dried at 70-80 ° C for 8 to 10 minutes. The resulting adhesive tape is kept for about 24 hours at room temperature and tested.

The resulting adhesive is a uniform mixture of white with a yellowish tinge. Glue viability not less than 6 months

Samples No. 2, 3, 4 according to the invention are prepared as follows. A mixture of solvents (toluene, ethyl acetate, and acetone in the ratio 3.3: 1: 1) in an amount of 26.72 wt.% Is loaded into a mixer with Z-shaped blades. The solvent mixture is prepared in a known manner with mechanical stirring. Then, 3–5 cm of natural rubber 3.0 wt.% And synthetic isoprene rubber of 2.0 wt.% Are pre-crushed to a particle size of 3–5 cm. Swelling occurs within 4 hours, and then the contents are mixed until the rubbers are completely dissolved. Guitana dioxide is then introduced 2.55% by weight. styrene butadiene styrene elastoplast 5.0.%, the indicated mixture of solvents in the amount of 30.54 wt.% and mix the contents until complete dissolution. Then, the solvent mixture was loaded with 19.09 wt.%, The glycerin ester of rosin was loaded on May 5.0. %, indene-coumarone resin — 1.0 mcc.%, rosin, 5.0 wt.%, 2,2-dmmethoxm-2-phenylacetophenone, 0.1 wt.%. The contents are mixed until a homogeneous solution is obtained. The resulting glue represents

a homogeneous mixture of a light yellow color with a VZ-4 viscosity of 140 ± 10 s. Glue viability not less than 6 months. The glue is applied to the polyethylene terephthalate base in a known manner, dried at 70-80 ° C for 8-10 minutes. The adhesive tape obtained is kept for 24 hours at room temperature and tested.

Claims (1)

In tab. 1 shows the formulations of adhesives, in table. 2 - comparative properties of adhesives. Claims for adhesive tapes, including butadiene styrene thermoplastic elastomer, synthetic rubber, indene-coumarone resin, rosin glycerin ester, rosin, titanium dioxide and solvent, characterized in that, in order to increase the bonding strength, resistance to impact chemical-photographic solutions and an increase in the service life of the tape; it contains synthetic isoprene rubber and, additionally, natural rubber and 2,2-dimethoxy-2-phenylacetophenone as synthetic rubber, in the following ratio components, wt.%: Butadiene styrene thermoplastic elastomer 4,5 - 5,5 Natural rubber2.5 - 3.5 Synthetic isoprene rubber1,6-2,4 Inden-coumarone resin 0.7 - 1.3 Glycerol zfir, rosin4,5 - 5,5 Rosin4,5 - 5,5 Titanium dioxide2.3-2.7 2,2-Dimethoxy-2-phenylacetophenone 0.07 - 0.20 0 SolventEther Table Butadiene Thermoplastic Elastomer Copolymer of butadiene, acrylonitrile and 2-cyanoethyl methacrylate Isoprene synthetic rubber SKI-ZS Natural rubber Indenkumaronova gum ester rosin glycerin resin Rosin Chloroparaffin Titanium dioxide 2,2-Dimethoxy-2-pheny acetophenone Solvent mixture (3.3: 1: 1): toluene, butyl acetate, acetone Skpeyki shift under static load 60N for 10 min, mm (+ 0.01) Adhesion to triacetate film, n / mm (+ 0.01) Divergence time, h, glueing in chiiko-photographic solutions under a load of 6N at c 20 ± 5 ° C in: 0.19 0.20 0.23 0.28 0.15 0.15 0.16 0.16 0.80 0.75 0.60 0.40 1.00 1.00 1.00 0.95 Note. A-tests were carried out after the manufacture of the tape, B, C, D - correspondingly after 3, 6, 12 months. 5.0 5.5 4.5 2.55 2.7 2.3 0.1 0.2 0.07 Stal- Rest- The rest is mine P, I7 0. 1 7 0.1 ° 1 111 nf I. M8 P, t / i 0.16 0.16 f. . 1.00 , 00 0.90