CS230472B1 - Solution Shoe Adhesive - Google Patents

Abstract

The invention relates to a solution or footwear adhesive. It solves the problem of an advantageous composition of the adhesive with increased thermal stability and final strength of the joint. The essence of the invention is that the adhesive consists of 14 to 21% by mass. ochloroprene rubber, 0.1 to 2 wt.% alkaline earth metal oxides, 20 to 35% by mass. of toluene, 18 to 40 wt.% gasoline, 10 to 25 wt.% ethyl acetate, 0.1 to 5% chlorinated natural rubber with 40 to 70% wt. chlorine content and 3 to 10 wt.% of alkylphenolic resol, formed by gradual condensation of 60 to 70 wt.% a|alkylphenol or alkylphenols β with the content of carbon atoms in alkyl C3 to Ca, 5 to 25% by mass. dihydroxydiphenylpro- ? anu and 20 to 30% by mass. of formaldehyde, priom alkaline condensation is carried out in the presence of 1 to 5% by mass. hydroxide or alkali metal hydroxides at a temperature of 50 to 70 °C and acid condensation at a pH of the aqueous phase of 1.5 to 4.0 at a temperature of 50 to 90 ®C. The invention may have been used in shoe manufacturing.

Description

The present invention relates to a shoe adhesive solution consisting of chloro-rhenium rubber, alkaline earth metal oxides, solvents, chlorinated natural rubber and phenol-imaldehyde condensate suitable for bonding bottom and upper materials.

In shoe production, when gluing the sole and the upper, it is necessary that the adhesive formed joint has good adhesive and cohesive properties not only at the temperature at which the footwear is normally worn, but also at temperatures proportionally higher, for example 40 to 50 ° C. In order to increase the heat resistance, the adhesives for shoe applications are treated.

Known is a shoe adhesive formed by a composition of polychloroprene rubber and phenol-formaldehyde resin, which is modified by the addition of a crosslinker, for example triphenylmethane trisocyanate. The adhesive thus treated has a higher heat resistance. It is also known to use a combination of two resins in the production of phenol-formaldehyde condensate, whereby the resins are able to react and thereby crosslink the adhesive because they have free reactive hydrogen atoms of 2 to 4 atoms.

It is also known to use a cyclic substituent phenol. A disadvantage of crosslinking adhesives is that viscosity increases very markedly after 6 to 8 hours of standing. Ultimately, an insoluble gel is formed which cannot be used fairly. A disadvantage of the above phenol-formaldehyde condensates is the reduced solubility as well as the fact that the reactive phenol-formaldehyde resin-oxide complex

- 2 230 472 magnesium must be prepared separately from the glue preparation itself. As a result, part of the adhesive preparation is prolonged and the heat resistance value of the glued joint is also reduced.

The above-mentioned disadvantages are overcome by the adhesive according to the invention, which consists of 14 to 21% by weight, chloroprene rubber, 0.1 to 2% by weight. 20 to 35 wt. % toluene, 18 to 40 wt. % gasoline, 10 to 25 wt. % ethyl acetate, 0.1 to 5 wt. % chlorinated natural rubber with 40 to 70 wt. % chlorine and 3 to 10 wt. % of an alkylphenol resol formed by successive alkaline and acidic condensation of 60 to 70 wt. % alkylphenol or alkylphenols containing up to 0%, up to 25 wt. % dihydroxidiphenylpropane and 20 to 30 wt. % of oxaldehyde, wherein the alkaline condensation is carried out in the presence of 1 to 5 wt. alkali metal hydroxide or hydroxides at 50-70 ° C; and acidic condensation at a pH of the aqueous phase of 1.5-4.0 at 50-90 ° C.

The technical effect of the adhesive according to the invention is to increase the thermal stability and ultimate strength of the joint. In the preparation of the adhesive, the resin is added directly to the mixture, which shortens the preparation time of the adhesive. The adhesive has good adhesive and cohesive properties,

The adhesive according to the invention is illustrated in more detail by the following examples, all components being in percent by weight.

Example 1

The stirrer flasks were sequentially dosed as follows

ingredients: chloroprene rubber 14.4 % phenol formaldehyde condensate 7.7 % zinc oxide 0.9 % magnesium oxide 1.9 % toluene 31.7 % acetate 24.2 % benzine 19.4 % chlorinated natural rubber 0.48%

- 3,230,472

Penolformaldehyde condensate was prepared by condensation of 48.7% tert-butylphenol and 14.94% dihydroxidiphenylpropane,

32.47% foalaldehyde and 3.9% hexamethylenethylamine at boiling for two hours.

After homogenization, an adhesive was obtained which was applied to the bonding of the rubber vulcanizate and the leather upper. Final joint strengths were above 85 N / 2.5 cm. The thermal stability was determined by the peel length in cm at 65 ° C and a 1 kg load. The thermal stability is the higher the smaller the length of the joint. In Example 1, which served as a reference sample, a peel value of 6 cm was measured.

Example 2

The stirrer flasks were sequentially dosed as follows

ingredients: chloroprene rubber 16.7% alkylphenol resol 5.6% zinc oxide 0.48% magnesium oxide 0.9% toluene 23.8% acetate 16.0% petrol 38.4% chlorinated natural rubber 0,12%

The alkylphenol resol was prepared by condensing 69.1% p-tert-butylphenol, 5.2% dihydroxidiphenylpropane with 24.1% foalaldehyde first in the presence of 1.8% sodium hydroxide and then at an aqueous phase pH of 2.5. 2.5 cm. The thermal joint value, under the same conditions as in Example 1, was 2 cm.

Example 3

The ingredients of chloroprene rubber 18.4% alkylphenol resol 3.8% zinc oxide 0.19%

- 4 magnesium oxide toluene ethyl acetate petrol chlorinated natural rubber

0.74%

24.8% 12.0% 38.1% 1.9%

230 472

The alkylphenolic resol was prepared by condensing 28.9% p-tert-butylphenol and 35.3% octylphenol, 8.4% dihydroxidiphenylpropane with 23.05% formaldehyde first in the presence of 2% sodium hydroxide and 2.4% potassium hydroxide, and then at pH aqueous phase 1.8.

The bond strength value was 88 N / 2.5 cm.

The thermal bonding value, under the same conditions as in Example 1, was 3.4 cm.

Any alkaline earth metal oxide may be used in the zinc and magnesium oxide.

The alkaline condensation was carried out at 55 ° C in Example 2 and 65 ° C in Example 3. The acid condensation was carried out at 60 ° C in Example 2 and at 80 ° C in Example 3.

Claims (1)

- 5 - PRBDMET V ϊ L L ϋ 47 47 47 n 47 47 47 47 47 47 47 47 47 47 ové ové 47 ové ové ové 47 ové 47 47 230 472 Chloroprene rubber, alkaline earth metal oxide, organic, solvent and natural rubber based footwear adhesive, characterized in that it consists of 14 to 21 wt. chloroprene rubber, 0.1 to 2 wt. % alkaline earth metal oxides, 20 to 35 wt. % toiuene, 18 to 40 wt. % of gasoline, 10 to 25% by weight of ethyl acetate, 0.1 to 5% by weight. % of chlorinated natural rubber 40 to 70 wt. chlorine content and 3 to 10 wt. % of an alkylphenol resol formed by successive alkaline and acid condensation of 60 to 70 wt. alkylphenol or alkylphenols having carbon atoms in the alkyl to C8, 5 to 25% w / w of dihydroxyphenylpropane and 20 to 30% w / w; % of formaldehyde, wherein the alkaline condensation is carried out in the presence of 1 to 5 wt. alkali metal hydroxide or hydroxides at a temperature of 50 to 70 ° C and acidic condensation at a pH of waterphase 1.5 to 40 ° C at 50 to 90 ° C.