SU373279A1 - FORMABLE POLYMER COMPOSITION - Google Patents

Description

The invention relates to block copolymers based on dienes and vinyl aromatic compounds and chain-chain polymers. Such an invention can find application in the preparation of various coatings in textiles, paper, concrete, metal and other materials, as well as in the preparation of film products. The known composition is based on block copolymers of dienes and vinyl aromatic compounds of the type ABA, where A is the block of the vinyl aromatic compound, B is the block of polydiene mixed with carbochain polymer (polyethylene). However, this composition has a relatively low melt index (which is determined at 190 ° C, a load of 21.6 kg, a capillary diameter of 2 mm}, a high processing temperature on the roller equipment, which 0 | is due to the melting point (Polyethylene, 130-140 ° C, as well as insufficient oil and petrol resistance and strength of attachment to the base (textiles, concrete, metal, etc.), high residual elongation. In addition, the use of low molecular weight polyester polyethylene as a chain-chain polymer leads to its migration from the comp The aim of the invention is to improve a number of physicomechanical indicators and increase oil; petrol resistance of moldable polymer compositions. This goal is achieved by using polymers selected from the group consisting of polyethylene, chlorinated or chlorosulphurized as high molecular weight additives. polyethylene, thermo-degraded polyethylene oxidation product, polyvinylchloride, reed, nitrile-butadiene, lichloroprene rubber in the amount of 0.5-50 weight. hours per 100 weight. h block copolymers. H1a fillers can be added to the composition. The composition according to the invention consists of a block copolymer of the ABA type, where A is the block of the alkyl aromatic compound, B is the block of the polydiene, and high molecular weight additives. As a block copolymer of the ABA type, there can be used styrene-butadiene thermoplastic elastomer (DST), isoprene-styrene thermoplastic elastomer (ICT), iso-pre-cc-methylstyrene thermoplastic elastomer (ISTD) and others with a block A content of at least 20% in each. As the high molecular weight additives, the compounds given above are used in the amount of 0.5-50 wt. hours per 100 weight. h block copolymers. PT change this ratio to the side

an increase in the content of high-molecular additives in the composition leads to a decrease in the tensile strength, an increase in the residual elongation, and oil-benzene resistance. Introduction of less than 0.5 weight. among others, it does not give a noticeable change in the properties of the composition as compared with conventional block-copolymers of the ABA type. Compositions can be either unfilled or filled, depending on the properties of the starting block copolymers of type TWO and the purpose of the composition. To reduce the cost or color of the composition, various fillers can be added to it, for example, metal oxides 1 (calcium, zinc, etc.), metal dioxide (titanium, etc.) and non-metals (silicon, etc.), metal hydroxides (calcium, zinc), various carbon blacks, for example gas channel, lamp, furnace blacks, as well as organic and non-organic acids, such as stearic, silica, and their salts (zinc stearate, calcium silicate, calcium carbonate, etc.).

ABC copolymer type ABA measures

Butadiene styrene termoelastoplast containing 27% bound styrene, with a melt index of 0.6 g / 10 min (DST-30-1)

Also

3 4

rutadiene styrene thermoplastic elastomer containing 26% bound styrene with a melt index of 1.5 g / 10 min (DST-30-2)

Also

Butadiene styrene thermoplastic elastomer containing 29% bound styrene with a melt index of 39 g / 10 min (DST-30-3)

Block copolymers of the ABA type and the aforementioned high molecular weight additives are well combined with each other, especially with the nitrile rubber, which results in a small amount of time for mixing them, reducing the processing temperature, improving the transparency of the resulting films, and increasing the physical and mechanical properties.

The compositions are prepared by mechanical mixing of polymer components, for example, on a mixing roll and other mixing equipment. If necessary, granulation of the compositions is carried out on conventional granulating machines. The processing of compositions into articles can be carried out by calendering (laminating), extrusion, injection molding, dissolution using equipment commonly used for these purposes.

In tab. 1, 2 shows examples of compositions illustrating the invention and their properties.

Table 1

High molecular weight additive

High pressure polyethylene with a melt index of 1.5 g / 10 min.

The oxidation product of thermally degraded polyethylene with an acid number of 35 and mol. weight. 1000

Butadiene nitrile rubber SKN-40 M

Chlorinated polyethylene containing 39% chlorine

Polychloroprene rubber, NT

Chlorosulfonated polyethylene Polyvinyl chloride (PVCS-70)

table 2

Examples

The compositions indicated in the table were made on a mixing roll at the appropriate temperature of the rolls. In Tsrimer, 1 crumb of block copolymer DST-30-1 was processed on a roll mill for 10 minutes. to obtain a polymer skin. On I minute, polyethylene was introduced into the polymer DST-30-1, and on 20 minutes, the filler was calcium hydroxide. The preparation time for the composition was 25-30 minutes.

In Examples 2-7, the compositions were prepared by the following method. The ABA copolymer chips were processed on rollers for 5 minutes. At 6 minutes, high molecular weight additives were added and mixing continued for up to 10 minutes. Calcium hydroxide is then added to the compositions. The total cooking time is 15 min.

The proposed compositions are processed at lower temperatures, have a higher melt index, lower residual elongation, increased oil and petrol resistance, and strength of attachment to the base. In addition, the compositions provide a complex set of positive properties imposed by various operating conditions for products made from them.

Subject invention

A polymer composition is formed, including an ABA type block copolymer, where A is a vinyl aromatic compound block., B is a polydiene block, high molecular weight additives, in order to improve the number of physicomechanical parameters and increase oil-petrol resistance, high molecular weight additives used are polymers selected from the group consisting of polyethylene, chlorinated or chlorosulfonated polyethylene, the oxidized product of thermally degraded polyethylene, polyvinyl chloride, butadiene nitrile, polychloroprene vy rubbers in an amount of 0.5 to 50 wt. hours per 100 weight. h block copolymers.