CS277277B6 - Laminated polyvinylchloride-based material with textile reinforcement - Google Patents

Abstract

In the previously known products made of plasticized polyvinyl chloride with textile reinforcement, the necessary cohesion is ensured primarily by the polyvinyl chloride - by modifying the mixture. The possibility of increasing adhesion from the textile reinforcement side is limited only to the addition of natural fibers with a rough structure and thus higher mechanical adhesion. The layered material according to the solution largely eliminates the disadvantages of the previous modifications of the PVC mixture (volatility and toxicity, processing properties and durability of the paste) by being made of a polyvinyl chloride mixture modified with trimercaptotriazine (in an amount of up to 3% by weight) and textile reinforcement, especially polyamide or polyester, impregnated with a bath containing polyvinyl chloride latex and the reaction product of formaldehyde and monofunctional or polyfunctional phenols in a mass ratio of the dry matter of both components of the bath 100; 1 to 5:1. At the same time, the cohesion of this layered material is higher compared to previous comparable materials with favorable economic indicators.

Description

The invention relates to a laminated material based on plasticized polyvinyl chloride with textile, in particular polyamide and / or polyester reinforcement.

Thanks to their properties, polyvinyl chloride products with textile reinforcement are increasingly used in various industries, even in demanding conditions. The properties of these products, whether conveyor belts, drive belts or hoses, are at a higher level when using a suitable reinforcing material (eg polyamide) compared to the parameters of comparable products from classic materials: they have higher strength, better resistance to impact and damage, longer durability and better economic parameters.

Ensuring sufficient cohesion of the polyvinyl chloride material with the textile reinforcement is a basic condition for the application of these layered products with otherwise very advantageous properties. The increase in adhesion between the two components of the product can be achieved in essentially two ways - by choosing (modifying) the textile reinforcement or by modifying the polyvinyl chloride mixture.

The hitherto known possibilities of using the first method are practically limited to the application of technical fabrics containing, in addition to polyamide or polyester fibers, a certain proportion of cotton fibers, which due to their rough surface contribute to increasing the adhesion of the fabric to polyvinyl chloride.

The second method is more widespread in practice, it has several variants based on the addition of a modifying substance or group of substances to the polyvinyl chloride mixture. For example, methods using aromatic polyisocyanates, cyanuric acid derivatives or a resorcinol-hexamethylenetetramine combination are known. It can be said that these systems have one common drawback - the volatility and toxicity of the additives used, which, moreover, often negatively affect the processing properties, especially the life of the polyvinyl chloride paste.

Modifications of polyvinyl chloride pastes by adhesion promoters, for example a solution of a mixture of linear and branched polyester alcohol in a mixture of ethyl acetate and methylene chloride, containing a crosslinking agent, must also be added to the above solutions to the adhesion problem by modifying the polyvinyl chloride mixture. This variant is driven by an effort to facilitate the mixing of some components. However, the preparation of such modified plastisols is relatively complicated, both due to the weighing of the individual components and the actual preparation of the mixture.

Said disadvantages and shortcomings of the hitherto known solutions are largely eliminated in the laminated material based on softened polyvinyl chloride with textile, in particular polyamide and / or polyester reinforcement, according to the invention. The essence of the invention is that the layered material is made of a polyvinyl chloride mixture unmodified or modified up to 3% by weight, trimercaptotriazine and textile reinforcement impregnated with a bath containing polyvinyl chloride latex and reaction product of formaldehyde and monofunctional or multifunctional phenols in a dry weight ratio of 100: 1 to 5: 1.

CS 277277 B6 2

The main advantage of the layered material according to the invention is the higher cohesion of the polyvinyl chloride with the textile reinforcement with a relatively simple modification of the polyvinyl chloride mixture, which is reflected in the economic advantage of the solution. The advantage is also the increased service life of the polyvinyl chloride paste and good processing properties. There is no need to use volatile and toxic additives.

The following example of a specific embodiment serves to further elucidate the essence of the invention and to demonstrate the effects of the solution.

An impregnation bath of the following composition (in d. D) was prepared:

resin solution 32.5 ... prepared from ingredients: resorcinol 1.4 PVC latex 45% 47.5 formalin 38% 2.0 NH ₄ 0H 25% 2.0 NaOH 10% 0.4 water 18.0 water 28.7 100.0 (+ 2 hours maturation) 32.5

Both polyamide and polyester textile reinforcement material was impregnated with this bath.

Furthermore, a PVC paste of the following composition was prepared (in weight):

polyvinyl chloride 50.0 dioctyl phthalate 33.85 trichlorethylene 3.0 chlorparaffin 3.0 micronized limestone 10.0 heat stabilizer 0.15

100.0

This paste was modified by the addition of 1 and 3 wt. d. trimercaptotriazine and used together with impregnated polyamide and polyester textiles to prepare the laminate.

The laminated material with polyamide reinforcement showed the following adhesion values:

Reinforcing material polyamide PVC paste addition of TMT / mass, d. / Adhesion / N / ČSN 260 370 not impregnated 0 0.7 impregnated 0 2.7 impregnated 1 3.7

The laminated material with polyester reinforcement achieved the following adhesion values:

Reinforcing material PVC paste polyester addition TNT / wt. d. / Adhesion / N / ČSN 621462 not impregnated 0 impregnated 0 impregnated 3 21 54. 61

note: TNT stands for trimercaptotriazine

These values demonstrate the high cohesiveness of the laminates according to the invention, even in the case of unmodified PVC paste, but especially in the case of a modified paste, with the above-mentioned economic and technological advantages.

Claims (1)

PATENT CLAIMS Laminated polyvinyl chloride laminate with textile, in particular polyamide and / or polyester reinforcement, characterized in that it consists of a polyvinyl chloride mixture unmodified or modified with up to 3% by weight of trimercaptotriazine and a textile reinforcement impregnated with a polyvinyl chloride latex and formaldehyde or monofunctional reaction product. of multifunctional phenols in a dry weight ratio of the two components of the bath of 100: 1 to 5: 1. ·