Polymer composition

 

(57) Abstract:

Usage: as a structural material for the manufacture of shells audio - and video equipment, etc., the Essence of the invention: polymer composition includes a resin plant (ABS) copolymer and a polymeric additive on the basis of a copolymer of styrene (S). As SOS composition contains SOS with 20 - 60 % of methyl methacrylate or SOS with 7 - 10 % of Acrylonitrile and 43 - 50 % of methyl methacrylate in the following ratio, wt. %: ABS 94,0 - 96,5; SOS 3,5 - 6,0. table 1.

The invention relates to polymeric compositions based resin plant (ABS) copolymers, which are widely used as structural materials, for example, for the manufacture of shells audio - and video equipment, computers, telephones, etc.

For use in these products copolymers ABS must have a sufficiently high impact resistance and good decorative effect. Modern design requirements in some cases prefer glossy (shiny) surfaces of the front panels of the equipment. The glossiness of the surface not only gives the product a commodity, but is a valuable technical characteristics, so ICA and its destruction. However, the copolymers ABS are by nature a matte surface. To make the surface of the ABS Shine apply certain techniques.

Known polymer composition comprising a copolymer ABS and polymer additive on the basis of a copolymer of styrene, which contains:

0.1 to 10% acrylate or methacrylate containing epoxy-, hydroxyl - or alkoxy-group;

20-99,9% of alkylacrylate that do not contain epoxy-, hydroxyl - or alkoxy-group;

0-79,9% other copolymerizable vinyl compounds (styrene, Acrylonitrile, methyl methacrylate and other).

In known compositions is a copolymer, necessarily contains links acrylate or methacrylate functional groups of the epoxy-, hydroxyl - or alkoxy-groups, and also containing links alkylacrylate [1]

However, this polymer additive is not possible to get ABS with a high surface gloss and improved weather resistance.

Known and other polymer composition that includes a resin plant copolymer and polymer additive on the basis of a copolymer of styrene [2] which have high level of impact strength and surface gloss 57-60 defined on the gloss FB-2 by comparison is like during polymerization in mass. The introduction of blockcopolymer somewhat complicates the process and copolymers of the road. This significantly degrades the technical-economic indicators of the process and increases the cost of the product. The introduction of additional quantities of rubber leads to accelerated aging of the composition, as the stability of the polymer during operation is determined mainly by the content of the unsaturated rubber.

The technical result of the invention of improving the weather resistance of the composition, reducing the cost of its acquisition and expansion of the range of the original products.

For this as styrene composition comprises a copolymer of styrene with 20-60% of methyl methacrylate or a copolymer of styrene with 7-10% of Acrylonitrile and 43-50% of methyl methacrylate in the following ratio, wt.

Acrylonitrilebutadiene-

styrene copolymer 94,0 to 96.5

The copolymer of styrene 3,5-6,0

As components of the compositions of the invention used:

copolymers ABS, obtained by polymerization in mass, containing 6-12 wt. polybutadiene, stamps ABS M (TU 6-05-2022-86);

copolymers ABS, obtained block-suspension method, containing 6 wt. polybutadiene, ABS grades-B (TU 6-05-2037-87);

the copolymers And the copolymers of styrene and methyl methacrylate (MS), obtained by copolymerization in bulk or suspension of styrene with methyl methacrylate, taken in the ratio (80-40):(20-60), marks MS-20, MS-40 and MS-60 (GOST 12271-76);

copolymers of styrene, Acrylonitrile and methyl methacrylate (sit) obtained by copolymerization in bulk or suspension of styrene, Acrylonitrile and methyl methacrylate, taken in the ratio(50-40):(7-10):(43-50) (GOST 12271-76).

The composition of the polymer-polymer compositions may include conventional additives thermal and light stabilizers, antistatic agents, dyes and pigments, and flame retardants such as brominated aromatic compounds in combination with antimony trioxide, etc. In the composition may also contain plasticizers, softeners and other additives.

The composition can be prepared by mixing the components in conventional mixing equipment with subsequent granulation. However, it is possible to prepare a concentrate of the dye with the use of copolymers of styrene as a polymer base concentrate and the concentrate is then mixed with ABS.

For granulation used conventional extruder-granulator.

The composition was investigated on the following parameters:

the melt flow index according to GOST 11645-79;

toughness Alnoe elongation at break according to GOST 11262-80;

the heat Vika according to GOST 15088-83.

The surface gloss was determined on the gloss FB-2 by comparing the reflected Shine with the standard.

The weather resistance was determined according to GOST 9.708-83 by injection molding samples for modifying the color characteristics of the samples after exposure in the device IPST for 100 hours Full colour difference E and the color differences in the lightness L, the saturation S and hue T was measured by colorimeter "Spectator" when the light source S.

P R I m e R 1. 47,5 kg ABS-M 0602 beyond 6-05-2022-86; 2.5 kg of copolymer MS-20 with a melt flow index (MFR) of 29.3 g/10 min, 0.1 kg of stabilizer Irganox 1076 and 0.1 kg of CA stearate loaded into the mixer heavy type (Bunbury) and mixed in the melt for 5-10 minutes at 170-180aboutS, after which the mass is fed to the extruder and granularit. Physico-mechanical properties of the resulting composition are shown in table.

P R I m m e R 2. 47,5 kg ABS-M 0602 beyond 6-05-2022-86, 2.5 kg of copolymer MS-20 (MFR of 29.3 g/10 min); 0.1 kg stabilizer Irganox 1076; 0.1 kg of CA stearate download in high speed mixer and stirred for 10-15 min, the resulting mixture is fed into the hopper of twin screw extruder. The mixing is carried out at 190-240about(P is ucaut as in example 1, but as polymer additives took copolymer brand MS-40.

P R I m e R 4. 40 kg of copolymer MS-20 with a melt flow index (MFR) of 30 g/10 min and 10 kg of black paste consisting of 2 kg of carbon black mark PM 100V and 8 kg of dioctylphthalate were loaded into the mixer heavy type and mixed for 5-10 minutes at 170-180aboutS, after which the mass was applied to the extruder and granulated.

The obtained concentrate dye used for modification and simultaneous staining ABS directly produced in the casting process. For this 2.0 kg ABS ABS grades-M 0602 mixed with 0.1 kg of the obtained concentrate dye directly into the hopper of the molding machine; then were cast samples for testing.

Physico-mechanical characteristics of the composition given in the table.

P R I m e R s 5-12. Compositions were prepared and tested as in example 1, but used the ABS of different brands and various polymer additives target. The compositions and their physical and mechanical properties are given in table.

For comparison, the table also gives the properties used grades of ABS, as well as the composition of the prototype (the last line).

As can be seen from the table, the components of the S-plastics while maintaining the overall level of physico-mechanical characteristics; when the melt flow index of the compositions is higher than the original ABS that improves the quality of molded products. In addition, changes in color characteristics, glamour and the absolute value of the total color differences after exposure of the compositions is lower than the original ABS that says more about their high weather resistance.

POLYMER COMPOSITION that includes a resin plant copolymer and polymer additive on the basis of a copolymer of styrene, characterized in that as a copolymer of styrene composition comprises a copolymer of styrene with 20

60% of methyl methacrylate or a copolymer of styrene with 7 to 10% of Acrylonitrile and 43 of 50% of methyl methacrylate in the following ratio, wt.

Resin plant copolymer 94,0 96,5

The copolymer of styrene 3,5 6,0

 

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