CS263387B1

CS263387B1 - The vinyl chloride-filled mixture is enhanced with a higher stability

Info

Publication number: CS263387B1
Application number: CS874244A
Authority: CS
Inventors: Peter Ing Csc Liptak
Original assignee: Peter Ing Csc Liptak
Priority date: 1987-06-10
Filing date: 1987-06-10
Publication date: 1989-04-14
Also published as: CS424487A1

Abstract

Riešený problém spadá do oblasti káblovej a izolantskej techniky v elektrotechnickom priemysle. Očelom riešenia je využitie nového typu aditívu na zvýšenie termostability izolačného materiálu a tým predlženie životnosti káblov. Podstatou riešenia je, že plnivo do PVC zmesi sa před přidáním do základného, vhodné aditivovaného polyméru impregnuje 0,1 až 5,0 hmot. dielov merkaptoalkyltrialkoxysilánom na 100 hmot. dielov plniva.The problem being solved falls into the field of cable and insulation technology in the electrical industry. The aim of the solution is to use a new type of additive to increase the thermostability of the insulating material and thus extend the service life of the cables. The essence of the solution is that the filler for the PVC mixture is impregnated with 0.1 to 5.0 parts by weight of mercaptoalkyltrialkoxysilane per 100 parts by weight of the filler before being added to the basic, suitably additived polymer.

Description

263387 2

The present invention relates to filled PVC compositions used in cable and insulating technology as well as in the art where filler-modified PVC is required to blend with increased thermal and mechanical stability.

Among the most effective stabilizing systems are organotrophic stabilizers, dibutyl- or dioctylcinic compounds, lead stabilizers such as lead (basic lead sulphate, bivalent lead phthalate, basic lead carbonate). in which the secondary, so-called synergistic component, the carboxylic salts of Ba and Ca are formed. to decrypt the quenching of PVC products by binding metal chlorides resulting from the decomposition of metal stabilizers, using as an organic stabilizer aminocrotone esters, 2-phenylindole and pe polyols. ntaerythritol, trimethylolpropane, possibly sorbitol, by effective n-molecular weight bifilar itructants to enhance the interaction between the intermediate and the polymer-organosilicon linkers. These have also been applied in filled PVC blends. These include, in particular, unsaturated trialkoxysilanes, and vinyltrialkoxysilane (GB 2 033 402). Of the other silanes, the ammonium silane was also charged with inorganic alkoxy groups in PVC mixtures (patent GB1,564,552). In some compositions, the mechanical-mechanical properties are adjusted. They have, however, a negative impact on the flexibility of the spun PVC blend.

At present, mercapto sulphates are used mainly in filled elastomers with ground sulfur, possibly with metal oxides.

The above stabilization systems, in addition to improving thermal stability, have little effect on other utility properties of filled PVC blends.

The object of the invention, which overcomes the above-mentioned disadvantages, is filled with PVC compositions with increased heat stability, which consist of a basic polymer, a filler, a stabilizing system and a plasticizer. The invention is based on the fact that the filler is impregnated with mercaptoalkyltrialkoxysilane in an amount of 0.1 to 5.0 wt. parts, preferably 0.3 to 2.5 wt. dielovmercaptopropyltrimethoxy-, resp. triethoxysilane per 100 wt. parts of the filler at room temperature.

It has been found that although the mercaptosilanes themselves do not substantially affect the thermal stability of the polymer in the absence of filler, a multiplication of thermostability can be achieved after impregnation of some inorganic hydroxides, alumina, nosilicates, oxides and metal carbonates with analogous surfactant-free systems. tions. Thus, it exhibits a synergistic effect in the system of filler-mercaptosilane on the thermo-stability of PVC. This synergistic effect is increased in the presence of Pb, respectively. Stearate Ca in the mixture.

The principle of the invention is that the mercaptosilane-impregnated filler reduces PVC dehydrochlorination. The moohanic-static properties of the polymer improve. In the examples below, the PVC blends prepared by various combinations of filler and other additives calendered on a double roller at 150 ° C for 5 minutes (Example 1 to 12) and at 170 ° C for 5 minutes (Examples 13 and 14) are included. . In this case, by way of an odd link, the mixture without a filler modification represents a trialkoxysilane, even numbers represent samples and a filler impregnated according to the invention. The advantages of the synergistic action of mercaptoalkyltrialkoxylate on the thermostability of the filled PVC blends, especially in Example 2, where the increase in thermostability of the sample is three times that of sample 1, without addition of trialkoxysilane, are shown from the examples. 3 263387

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Claims

Polyvinyl chloride filled mixtures with increased, thermostability, modified with additives and optionally a plasticizer, characterized in that it contains a filler pre-impregnated with mercaptopropyltrimethoxy or mercaptopropyltriethoxysilene.