CS275789B6 - Adhesive system - Google Patents

Abstract

The adhesive system for polyvinyl chloride-based mixtures and textile reinforcement materials according to the proposal is formed by a combination of 0.1 to 6 parts by weight of maleimide and 0.1 to 4 parts by weight of trimercaptotriazine or 0.1 to 6 parts by weight of maleimide and 0.1 to 4 parts by weight of N-cyclohexyl-2-benzothiazylsulfenamide per 100 parts by weight of polyvinyl chloride.

Description

The invention relates to an adhesive system for mixtures based on polyvinyl chloride and textile, in particular polyamide and polyester reinforcing materials.

Polyvinyl chloride products, whether conveyor belts, drive belts, hoses or other products, are becoming increasingly popular in various industries, especially in demanding conditions. The properties of these products are significantly improved by reinforcement with textile materials. For example, conveyor belts reinforced with polyamide cords or technical fabric containing polyamide fibers have higher strength and better impact resistance than conventional belts, have a longer service life and lower costs per tonne of material transported.

The mutual adhesion of the two components is important for the perfect connection of polyamide or polyester fibers with the polyvinyl chloride-based mixture. Technical fabrics used, for example, to reinforce conveyor belts often contain, in addition to polyamide or polyester fibers, a certain percentage of cotton fibers, which, due to their rough surface, ensure the mechanical adhesion of the fabric to polyvinyl chloride. For cords or fabrics made only of polyamide or polyester), mechanical adhesion must be replaced by chemical adhesion. There are basically two ways to increase the adhesion of textile reinforcement materials to a polyvinyl chloride-based composition: impregnation of the reinforcement materials with adhesion promoters. and modification of the polyvinyl chloride mixture.

Impregnation baths of reinforcing materials for polyvinyl chloride mixtures are often formed by plastisols. These plastisols may contain a crosslinking agent, such as isocyanates. The disadvantage of these impregnation baths is the relative complexity of their preparation and the limited life of the paste.

Modifiers used in polyvinyl chloride blends, such as aromatic polyisocyanates, cyanuric acid derivatives or resorcinol-hexamethylenetetramine combinations, form substances during gelatinization that provide increased adhesion of textiles and polyvinyl chloride. The disadvantage of these systems is in most cases the release of toxic substances and the negative influence of some physico-mechanical properties of the polyvinyl chloride-based mixture.

The disadvantage of these solutions is eliminated by the adhesive system for mixtures based on polyvinyl chloride and textile, especially polyamide and polyester reinforcing materials. The essence of the invention lies in the fact that the mixture contains, in addition to the commonly used additives, a system of 0.1 to 6 wt. d. of maleimide and 0.1 to 4 wt. d. trimercaptotriazine or 0.1 to 6 wt. d. of maleimide and 0.1 to 4 wt. d. N-cyclohexyl-2-benzothiazylsulfenamide per 100 wt. d. polyvinyl chloride.

The advantages of the adhesive system according to the invention are that the reinforcing materials, i. especially cords, it is not necessary to impregnate. This saves one demanding production operation, which represents significant financial savings with very good adhesion values.

The following examples further illustrate the invention.

Example 1

A polyvinyl chloride mixture of the following composition was prepared

polyvinyl chloride dioctyl phthalate tri chloroethylene chloroparaffin micronized limestone heat stabilizer 50.00 wt. d. 33.85 3.00 3.00 10.00 0.15

CS 275789 86 ^z

It was mixed into this mixture

a) various amounts of m-phenylene-bis-maleimide and using non-impregnated polyamide and polyester cords, test specimens were prepared and adhesion measurements were performed according to ČSN 621462 with the results given in Table 1.

Table 1

Preparation of m-phenylene-bis maleimide, wt. d. Adhesion (N) polyamide cords polyester cords 0 20 17 4 33 23 6 45 29 8 46 32

b) different amounts of tri-mercapto-triazine and using non-impregnated polyamide and polyester cords, test specimens were prepared and adhesion measurements were performed according to ČSN 621462. The results are shown in Table 2.

Table 2

Addition of tri-mercaptotriazine, hmod. d. Adhesion (N) polyamide cords polyester • cords 0 19 17 3 28 23 5 32 27

c) different amounts of m-phenylene-bis-maleimide and tri-mercaptotriazine and using non-impregnated polyamide and polyester cords, test specimens were prepared and adhesion measurements were performed according to ČSN 621462 with the results given in Table 3.

Table 3

Mix number 1 2 3 4 5 6 7 8 9 10 m-phenylene bismaleimide (wt.) 4 4 4 3 2 2 1 0.5 0.5 tri-mercaptotriazine (wt.) - 0.5 1 2 1 1 2 0.5 1 0.5 Adhesion of polyamide cords (N) 21 35 38 61 61 62 59 49 45 53 Adhesion of polyester cords (N) 20 31 34 48 46 ⁴⁷ 50 40 36 39

CS 275789 B 6

The test results clearly show a significant increase in the adhesion of the polyvinyl chloride mixture and the non-impregnated polyamide and polyester cords, given the apparently synergistic effect of maleimide and trimercaptotriazine.

Example 2

M-Phenylene-bis-maleimide, N-cyclohexyl-2-benzothiazolesulfenamide and trimercaptotriazine were mixed into a polyvinyl chloride mixture of the same composition as in Example 1. The adhesion of the mixture to the non-impregnated polyamide segment was measured for the samples according to ČSN 260570. The composition of the samples and the adhesion values are given in Table 4.

Table 4

Malei ni mi d (mass, d.) Trimercaptotriazine (mass, d.) N-cyclohexyl-2-benzothiazylsulfenamide (wt., D.) Adheze N. m ^-1 5 0 1 2.4 4 0 2 · 2.1 4 2 0 1.7

In the adhesion tests according to ČSN 260570, an increase in adhesion was achieved on the all-polyamide segment by the combination of in-phenylene-bis-maleimide. and N-cyclohexyl-2-benzothiazylsulfenamide (see Table 4).

Claims (1)

PATENT CLAIMS Adhesive system for mixtures based on polyvinyl chloride and textile, in particular polyamide and polyester reinforcing materials, characterized in that the mixture contains, in addition to the commonly used additives, a system of 0.1 to 6 wt. d. of maleimide and 0.1 to 4 wt. d. triroercaptotriazine or 0.1 to 6 wt. d. of maleimide and 0.1 to 4 wt. d. N-cyclohexyl-2-benzothiazylsulfenamide per 100 wt. d. polyvinyl chloride.