SU825572A1 - Glue-melt - Google Patents

Description

The image refers to chemistry by measure, namely, hot melt adhesives, which can be used to glue products from natural, synthetic and synthetic leather, fabric, cardboard and other materials. A hot melt adhesive is known, consisting of a mixture of a copolymer of ethylene and vinyl acetate (15-27%), a thermoplastic (15-27.5 wt.%) And a plasticizer (45-7O wt.%). Copolymers of acrylic, methacrylic acid, vinyl chloride and vinyl ester ti are used as thermoplastics. However, the introduction of glue up to 457% by weight of a plasticizer (dicyclohexyl phylate, methylphenyl isophthalate, etc.) does not allow to obtain a glue bond between the parts of a shoe that is stable for a long time, since the plasticizer is able to migrate to the surface the quality of the glue line is sharply reduced. Known hot melt adhesive, the contents of copolymer nitru pa, unsaturated mono or icarboxylic acid (120 wt.%), Amide. T pennosaturated, mono - or dicarboxylic acid (1-20 wt.%), Ester oi /, | b- ethylenically saturated hydroxy or dicarboxylic acid (4O-97% vCS%) and methyl methacrylate (1-3% by weight.%). The adhesive compound has good shear strength (4 4 MPa, substrate lithium ester film) G2. However, the glue has a high melt rate of up to 180-20 ° C and can not be used to glue parts of synthetic leather shoes. Glue melt is known for gluing parts of shoes made from natural, synthetic and artificial leather based on yolamides, which are the product of the polycondensation of dimethy esters of fatty acid linseed oil and ethylene amine.

1.5-2.0 s, operating temperature 135140 ° С 3.

However, such hot melt adhesives have an excellent shear strength of the glue line (1.2 MPa). The closest to the technical result and the resultant result achieved is the adhesive alloy G4: 1, used for gluing and parts of shoes, containing, Bec, 4i I Popibutylmethacrylate80-1OO

 - Toluene sulfonamide-formaldehyde resin (adhesive additive) 4О-8О Glue does not provide sufficient strength of adhesive glue.

The goal of the invention is to increase the strength of glue joint.

The goal is achieved by the fact that hot melt glue, including polybugylmethacrylate and adhesive additive, contains, as an adhesive additive, n -t-butylphenol-formaldehyde resin and additionally stearin in the following ratio of components, parts by weight:

Polybutylmethacrylate 10O

And t-Butyl phenol formaldehyde resin 40-75

Stearin3-8

Example 1. A mixture of 1OO May. including popibutyl methacrylate with a specific viscosity of 0.25 (1% solution in toluene);

75 wt.h. p -gretbutylphenolffmaldehyde resin as an adhesive additive} 7.5 wt.h. stearin (flow regulator) is loaded into enamel

the reactor, equipped with a jacket, a stirrer, a thermocouple, is melted at 15 ° ± 5 ° C and held for 3 hours under vacuum with constant stirring. Glue melt is applied to the edges of the blanks with bending

and edging, tightening and other operations.

The shear strength of the glue line is determined on a three-layer kersey;

6888 for GSHGGu 22307-77.

PRI mme R 2. The process is carried out analogously to example 1, but 1OO wt.h. polybutyl methacrylate with specific viscosity O, AOR (1% solution in

toluene); 4O, O wt.h. p -terbutylphenol-formaldehyde 5 parts by weight stearin.

Example 3. The ps-procedure is carried out analogously to example 1, but mixed

100 mach.h, popibuglmethacrylate with a specific viscosity of 0.15 (1% solution in toluene), 40O mach.h. m-tertiary butylphenol formaldehyde resin, 3 wt.h. stearin.

Physico-mechanical properties of the obtained melt according to example 1-3 are presented in the table.

CD

(O

to. YU

"

"

CM

c C7СЧ

ro

CO

CO

2

0) CM

CO

C9

S C9

Claims (4)

f As follows from the table, the joint use and tert-butylpheno-formaldehyde resin and stearin leads to a shear bonding strength of up to 4.32-4.36 MPa. The temperature of softening glue. Melt index g / 10 min, at a temperature of 150 C, 8.48; at 16 ° C, 13.71; at 23.57. Gluing strength on sdbig, MPa, after 24 h 3.35; after 8 days, 3.36Thermal resistance 1.71 MPa, water resistance 2.37 MPa, strength after watering 3.12 MPa in water. Hot melt glue can be used to fasten shoes from natural leathers to phoenix and pig chrome tanning of semi-aniline dyeing and synthetic leather, SC-2, clarino, pators, cord and d. 2 l and h and the fact that, in order to maintain the strength of the adhesive joint, it contains as an adhesive additive (1-t-butylpheno-formaldehyde smolui additionally stearin in the following ratio of components, parts by weight: Polybutylmethacrylate 100 n -Ttbu ipfeno fortla degidna smola4O-75 stearin. 3-8 Sources of information received note in the examination 1. England № Patent 1336571, cl, G 3 F opublyk .. 1973. 2. Swiss patent number 52019O, cl. With O9 J 3/14, publ. 1972. 3.Gaivoronska N.I. and others. Polyamide hot melt adhesives for shoe assembly. Leather industry, 1971, No. 2,; with. 19-21. 4. USSR author's certificate NO 594156, -kl. C 090- 3/14, 1976 (prototype).