Thermoplastic polymer composition

 

(57) Abstract:

Use: for the manufacture of structural parts based assignment thermoplastic polymer composition. The composition comprises, by weight. h: polycarbonate 40 - 95, ABS - Acrylonitrile butadiene and styrene 5 - 60, di-(2,4 - di - tert - butylphenyl) pentaerithritol 0,13 - 0,37, di - (2,6 - di - tert - butyl - 4 - were) pentaerythrityl or di - (2 - tert - butyl - 4 - cumylphenol) pentaerythrityl 0,13 - 0,37. Polycarbonate and ABS pre-dried at 120 and 80 respectively. The components of the composition are mixed in a mixer of the type "drunken barrel, the mixture ekstragiruyut at 240 -280 and shear rate 100-200-1ratio of viscosities of the melt polycarbonate and ABS is 1.4 to 2.6. The resulting composition is dried at 120C until a residual moisture content of not more than 0.02 wt. % getting samples by injection molding with melt temperature 280 280 5C 5 C and the mold temperature 70C. table 2.

The invention relates to the plastics industry and the development of impact-resistant thermostable composition based on a mixture of polycarbonate (PC) and a copolymer of Acrylonitrile, butadiene and styrene (ABS) for izgotovlenie aging, high technological properties.

Known impact-resistant composition based on blends of PC and ABS. The introduction of ABS in PC contributes to improvement of technological properties of compositions: there is an increase of melt flow index. However, the increase in the content of the ABS leads to a decrease in thermal stability. Dependence of impact strength according to Charpy from the composition of the mixture passes through a maximum at 20 wt. % ABS; it should be noted that the impact strength of the composition with the content of the ABS more than 20 wt. % less than that of the PC.

These compositions do not provide the finished structural parts necessary thermal stability and droproot properties in a wide range of concentrations.

Also known structural composition based on a mixture of PC and ABS, including the quality of thermal stabilizers esters of phosphorous acid or derivatives of ortho - and para-substituted phenols or bisphenols.

However, this composition, providing stability during injection molding, does not provide the level of impact-resistant properties to the details of construction application based on it.

The closest technical solution is a thermoplastic poly is 2,4-di-tert-butylphenyl)pentaerythrityl - fit is 0.1 to 5.0. The composition also contains phenolic antioxidant.

However, the known arrangement does not provide long-term thermal stability during processing, the level of impact properties and resistance to heat aging detail constructional purposes.

The aim of the invention is to improve thermal stability during processing compositions, resistance to heat aging and impact strength of the products based on it.

This objective is achieved in that a thermoplastic resin composition comprising a polycarbonate, a copolymer of Acrylonitrile, butadiene and styrene and di-(2,4-di-tert-butylphenyl)pentaerythrit - childerotic, polycarbonate and a copolymer of Acrylonitrile, butadiene and styrene are the ratio of the viscosities of melts measured at 240-280aboutC and a shear rate of 100-200-1, 1,4-2,6, and optionally the composition comprises di(2,6-di-tinder-butyl-4-were) pentaerythrityl or di-(2-tert-butyl-4-cumylphenol) pentaerythrityl in the following ratio of the components of the composition, wt. hours : polycarbonate 40-95

The copolymer Smoot-

lonitrile, buta - diene and styrene 50-60

Di-(2,4-di-tert-BU

terphenyl) pentari - trialdirector 0,13-0,37

Di-(2,6-di-tert-butyl-

The use of PC and ABS in the specified range relative viscosity of the melt promotes the formation of a more homogeneous structure of the dispersed type in a wide range of compositions to 60 wt. % ABS inclusive, while the ratio of viscosities outside 1,4-2,6 already at a ratio of 30 wt. % ABS implements the structure of the matrix type. The education structure of the dispersed type provides improved impact strength of structural parts destination.

The introduction of the mixture of additives di-(2,4-di-tert-butylphenyl)interfraternity-and di-(2,6-di-tert-butyl-4-were)pentaerythritoltetranitrate or di-(2-tert-butyl-4-cumylphenol)pentaerythritoltetranitrate phenolic compound, which corresponds to the phenolic component, PC, promotes better compatibility of the components of the mixture leads to increased toughness of time thermal stability of the composition and resistance to heat aging.

In the composition used aromatic polycarbonate based on bisphenol a with a maul. m Mn(37-42)X103containing 0.15 to 0.2 wt. % di-(2,4-di-tert-butylphenyl)pentaerythritoltetranitrate (TU 6-06-68-89) with a melt flow index MFR of 2 to 12 g/10 min at a temperature of 280aboutAnd the 10 g/10 min (T = 220aboutC, P = 10 kgf), which is obtained by copolymerization of styrene with Acrylonitrile in the presence of butadiene or b butadienestyrene rubber.

The invention is illustrated by the following examples.

P R I m e R 1. Composition composition, wt. hours : polycarbonate 95 ABS 5

Di-(2,6-di-tert-BU

Tyl-4-methylphe-

nil)pentaerythrit - childerotic 0,13

Di-(2,4-di-tert-BU

terphenyl)Penta - eatricedangit 0,13 mixed in the mixer "drunken barrel". Polycarbonate pre-dried to a residual moisture content of not more than 0.02% at a temperature of 120aboutC, ABS, at a temperature of 80aboutC. the resulting mixture ekstragiruyut at 280aboutC and a shear rate of 200 s-1ratio of the viscosities of molten polycarbonate and ABS conforms to:

Mn(37-42)103< / BR>
The resulting composition is dried at 120aboutC to a residual moisture content of not more than 0.02 wt. % getting samples by injection molding with melt temperature 280 5aboutWhen the mold temperature 70aboutC.

Properties of the obtained material are given in table. 1.

P R I m e R s 2-15. Analogously to example 1 are processed compositions, formulations and modes of processing are presented in table. VA is not more than 15% from the original value of the TPP.

Impact strength Charpy determine the tile size (HH) mm sharp notch in accordance with GOST 4647-80.

Evaluation of compositions for resistance to heat aging is determined by the change in impact strength notched at 70aboutWith and exposure 960 hours

For comparison with the composition of the prototype reproduced described composition. In the composition used polycarbonate brand FN 2500 Japanese company Idemitsu. Test data are also given in table. 1.

As an indicator of toughness, adopted the characteristic toughness in Sharpie with sharp notch.

Comparison of results of tests for impact strength Izod results of tests for impact strength with a sharp notch in Sharpie on experimental and literature data showed that the most informative from the point of view of the choice of songs is the test method for impact strength Charpy (PL. 2).

So from the data given in table. 2, it follows that the impact-resistant composition based PC when tested for impact strength Izod have a performance impact strength equal to or less than (SC-250) than the basic PC that is not sootwetstwujiut. When the test PC and compositions based on impact strength Charpy clearly shows the influence of composition on the value of toughness.

Tests for impact strength Charpy provide for two types of samples: type a - bar (HH) mm, rectangular notch; type B - bar (HH) mm, acute incision, this type of testing corresponds to the ISO-179.

The most informative is the test method for impact strength according to Charpy sharp notch in comparison with other methods.

Analysis of the data table. 1 shows that when using the compositions according to the invention in the specified range relative viscosity of melts of the original polymers allows you to:

B2 times, compared with the prototype, to increase the impact strength of structural parts of the material;

B2-fold increase in thermal stability of the composition during processing;

B2-fold increase in resistance to heat aging.

When the content of the mixture of cyclic diphosphite less than 0.25% , the effect of stabilization is not observed (example 9), when more content is 0.75% (example 12) the composition has a high level of thermal stability, but there has been a sharp decrease in the impact Vascos the -1126555, C 08 L 69/00, 1985.

A THERMOPLASTIC POLYMER COMPOSITION comprising a polycarbonate, a copolymer of Acrylonitrile, butadiene and styrene and di - (2,4 - di - tert - butylphenyl) pentaerythrityl, characterized in that it contains polycarbonate and the specified copolymer with the ratio of viscosities of melts measured at 240 - 280oC and a shear rate of 100 - 200-1, 1,4 - and 2,6 advanced composition comprises di(2,6 - di - tert - butyl - 4 - were) pentaerythrityl or di - (2 - tert - butyl - 4 - cumylphenol) pentaerythrityl in the following ratio, wt. including :

Polycarbonate 40 - 95

A copolymer of Acrylonitrile, butadiene and styrene 5 - 60

Di - (2,4 - di - tert - butylphenyl) pentaerythrityl 0,13 - 0,37

Di - (2,6 - di - tert - butyl - 4 - were) pentaerythrityl or 0,13 - 0,37

Di - (2 - tert - butyl - 4 - cumylphenol) pentaerythrityl 0,13 - 0,37

 

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