SU765314A1 - Polymeric composition - Google Patents

Description

one

The invention relates to polymers, in particular, to a polymer composition based on copolymers of methyl methacrylate, widely used for the production of various materials (sheets, tubes, granules, etc.).

To improve the processability of the compositions by screw extrusion, various lubricating agents are introduced into them. Thus, it is known to introduce stearic acid in the polymer composition in an amount of 0.02-0.2 weight.h. per 100 weight parts polymer as a lubricating agent 1.

However, such compositions are not well processed by extrusion, which is expressed in low productivity of the extrusion equipment.

So, when processing extrusion of a composition containing 0.15 weight.h. stearic acid, the specific productivity is 4.0 g / h / gsm.

The closest is the polymer composition containing homo- or copolymer of methyl methacrylate and telomere of ethyl acrylate in an amount of 3-40 parts by weight. per 100 weight.h; polymer 2.

This composition has improved casting properties. It has high melt index values (3.5-13 g / 10 min).

 The disadvantage of the composition is that it is impossible to obtain a high-quality extrudate during extrusion processing due to the low melt viscosity. Besides,

10, the introduction of the indicated amounts of telomer leads to a decrease in the heat resistance of products to.

The purpose of the invention is to increase heat resistance and improvement (processing capacity of the composition.

The goal is achieved by the fact that a polymer composition comprising a methyl methacrylate homo or copolymer as a telomer

contains telomere butyl acrylate.

20

The ratio of the components is the following, parts by weight: homo-or copolymer of methyl methacrylate - 100, telomere of butyl acrylate - 0.15-0.8.

Claims (1)

25 Telomeres of butyl acrylate with a molecular weight of 1000-1300 is the product of the telomerization of butyl acrylate and monoethylene glycol. solution: ethyl acetate in the presence of azodinitrile isobutyric acid. Example 1. To 100 wt.h. from methyl methacrylate polymer (MMA) with methacrylate (MA) (ratio 98s2) in the form of a crumb, having a melt index of 0.9 g / 10 min; mass, h. : barium sulphate 0.9 titanium dioxide 0.002, telomere buty lacrylate 0.15 with a molecular weight of 1200. The composition is stirred in a turbo separator at room temperature for 5 minutes and then processed by an extruder of the Brabender type. The specific output of the extruder, referred to the unit torque at. shpek shaft 5.0 g / h / gsm. Melt index 0.9 g / 10 min at 19 Heat resistance of products 108 ° C. Example 2, K 100 masses, h. polymethyl methacrylate in the form of a powder; 0.5 mass parts are added. The telomere of butyl acrylate with a molecular weight of 1100 is mixed and processed in Example 1. The specific productivity of an extruder is 13.2 g / h / h -. The index is 0.9 g / 10 min at, Heat resistance is 108 ° C, Example 3. It is carried out according to example 2, only butyl acrylate is taken in the amount of 0.8 mass, h. The specific performance of the extruder is 10.0 g / h / cm. The melt index is 0.91 g / 10 min at 190 ° C. Heat resistance. Introduction to the composition based on the copolymer of methyl methacrylate telomere butyl acrylate in amounts of O, 15-0.8 wt.h. per 100 wt.h. the polymer does not change the melt viscosity (melt index 0.9 g / 10 min at), but it significantly improves the processed composite composition by the screw extrusion method. Specific, the productivity of the extruder is increased by 1.5-3 times in comparison with the performance of the extruder when processing the composition containing stearic acid as a lubricant. The introduction of these amounts of telomer butyl acrylate does not reduce the heat resistance of the products (softening temperature 108 ° C), while the introduction of large quantities of telomer ethyl acrylate reduces the heat resistance to 95 ° C. The proposed amounts of telomere butyl acrylate provide the effect of increasing the productivity of extrusion equipment. When using quantities of less and more productivity decreases. With the introduction of 0.9 mass.h. The BA telomere specific productivity is 4.3 g / h / gsm with the introduction of 0.1 wt.h. - 4.5 g / h / gsm. The invention Polymer composition comprising a methyl methacrylate homo or copolymer and an acrylic ester-based telomere, is such that, in order to increase the heat resistance and improve the processability of the composition, it contains the telomere butyl acrylate at The following ratio of components, parts by weight: Homo-or methyl methacrylate copolymer 100 Telomere-butyl acrylate 0.15-0.8 Sources of information taken into account in the examination 1.Marek O. et al. Acrylic polymers. ML, Himi, 1966, p. 245. 2, USSR Author's Certificate No. 221268, cl. C 08 L 33/02, C 08 L, 33/12, 14.09.66 (prototype).