CS242143B1 - ABS-based blend - Google Patents

Abstract

A mixture based on ABS polymer with increased toughness at high processing temperatures is prepared by adding a saturated hydrocarbon with a melting point of - - 45 °C to 90 °C in a concentration of 1 to 17 parts by weight, preferably 3 to 8 parts by weight per 100 parts by weight of ABS polymer.

Description

The present invention relates to an ABS-based polymer composition characterized by increased toughness at high processing temperatures.

It is known that ABS polymers prepared especially by emulsion polymerization are highly sensitive to processing conditions, which can greatly affect their mechanical properties. Especially negative is the use of high processing temperatures, where the galling mechanical properties of ABS polymers significantly decrease, especially impact and notch toughness. The cause of the mechanical properties decline is not known precisely. In the literature, opinions are attributed to the cause of the decrease in the degree of orientation of the matrix, including the elastomeric component, or the agglomeration of the elastomeric particles at high processing temperatures. Therefore, processing temperatures of not more than 23 ° C are recommended when processing ABS polymers.

However, this has an adverse effect on the economy of ABS processing. The increased viscosity of the polymer melt at these processing temperatures limits the use of high injection rates, resulting in a reduction in processing capacity. increased fluidity, which is usually achieved by the addition of lubricants, but at the cost of reducing one of the key features of ABS, heat resistance Vicat.

These drawbacks are overcome by the ABS polymer blend prepared according to the invention. The composition according to the invention comprises an addition. saturated hydrocarbons at a concentration of 1-17 parts by weight per 100 parts by weight of ABS polymer. If liquid products are used, they can be directly metered into a quick mixer together with the other

242 143 ··· 3 - components of the mixture in the homogenization phase · Because they also have certain lubricating effects, their application allows the concentration of lubricants in the mixture to be reduced. In the case of solid hydrocarbons, they need to be pre-finished (eg by grating) or added during polymerisation or before coagulation ·

For the purposes of the present invention, an ABS polymer is understood to mean heterogeneous polymer systems composed of styrene, butadiene and acrylonitrile, respectively. in combination with alphamethylstyrene or parametrylstyrene, where the elastomeric component consists of a homo- or copolymer of butadiene or a mixture of elastomers.

Saturated hydrocarbon in the sense of the present invention means a mass with a linear, branched or cyclic chain of melting point - 45 ° C to 9 ° C »These are usually liquid to solid waxy substances · Examples of such substances are mineral oil, paraffin wax or products containing mixture of paraffinic and cycloparaffinic hydrocarbons ·

Other additives such as lubricants, plasticizers, heat and light stabilizers, antistatic agents, may also be present in the polymer composition of the invention. Flame retardants, antioxidants, polymers, pigments, fillers, blowing agents, etc. ·

The favorable physical-mechanical and rheological properties of the compositions prepared according to the invention are illustrated by the following examples

Example 1

Ke 100 wt. No saturated hydrocarbon was added to the ABS powder polymer parts. The material was processed on a granulation line consisting of a twin screw extruder, a cooling pan and a mower at an extruder head temperature of 210 ° C. From the obtained granulate, test specimens were made on an injection molding machine with worm preplastication at an injection temperature of 270 ° C.

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Impact and notch toughness of the bodies was determined in accordance with ČSN 640612. The rheological properties of the granulate were characterized by the melt flow index according to ČSN 640861. The heat resistance of Viaat was measured on a device with air tempering according to ČSN 640521.

Example 2

Ke 100 wt. 2 parts by weight of ABS powdered polymer were added. * The mixture was homogenized on a high speed mixer and processed on a granulation line consisting of a twin screw extruder, cooling tub and mower at an extruder Idave temperature of 210 ° C. The preparation of the test specimens and the evaluation of the selected properties were carried out in the same manner as in Example 1. The material properties are given in the table.

Example 3

Ke 100 wt. 17 parts by weight of ABS polymer powder were added. - 35 ° C * The mixture was homogenized and evaluated for properties in accordance with Example 2. The material properties are given in the table.

Example 4

Ke 100 wt. 5 parts by weight of ABS polymer powder were added. of paraffin wax having a melting point of 85 ° C. The mixture was homogenized and its properties evaluated according to the same β example 2. Material properties are given in the table *

Example 5

Ke 100 wt. 10 parts by weight of ABS polymer powder were added. of paraffin wax having a melting point of 62 ° C. The mixture was homogenized and evaluated for properties according to the procedure of Example 2. The material properties are shown in the table.

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Table

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Example. impact shock. / kJ / and ² / vrubová houž. melt flow index Vicat / W / * / / g / 10 min / / ° c / 1 58 6.5 9.8 119 2 86 10.2 11.1 118.5 3 92 11.8 16.4 116.5 4 100 ALIGN! 12.4 10.2 119 5 96 12.5 10, Q 118.5

Advantages, the compositions of the invention are evident from Example 2-5.

Claims (1)

SUBJECT OF THE INVENTION Based on a polymer blend of ABS, characterized in that it contains a saturated hydrocarbon having a melting point - 45 ⁰ to 90 ° C in a concentration of 1-17 wt. parts, preferably 3 to 8 wt. parts per 100 wt. ABS polymer parts.