Polymer composition

 

(57) Abstract:

Usage: composition based on unplasticized polyvinyl chloride /PVC/, processed by extrusion molding products with high whiteness. The inventive polymer composition contains,by weight. hours:PVC 100, the metal-containing thermo stabilizer 1-6 and grafted copolymer of 2 - 60% of vinyl chloride in 40 - 98% elastomer - 3-20 containing links,wt. %: butadiene 67-74 and styrene 26-33.table 1.

The invention relates to polymeric compositions based on unplasticized polyvinyl chloride (PVC), which are processed by extrusion, for example, in molding products (Windows and doors) with high whiteness.

During operation of PVC products, especially in conditions of light exposure, there is intense their colour change associated with the degradation of PVC. Therefore, the preservation of the white (light fastness) of the sample is a necessary condition for long-term reliable operation of the product. The lightfastness is convenient to characterize the degree of change in brightness obtained by the ratio of whiteness of the sample after and before socotrine in weatherometer.

It is known that at the outlet of the extruder crosshead or heat associated with relaxation of macromolecules, oriented in the flow (highly elastic deformation). For polymers, there is a limit of highly elastic deformation in the flow. When this limit is reached, the excess elastic strain energy can cause destruction of the extrudate (1), i.e., the torsion of the melt. Thus, the die swell is having a negative impact upon receipt of the profile both during calibration and the achievement of desired size, and during the selection of the processing conditions (speed of the auger and temperature zones of the extruder) (2).

Article (3) studied the swelling of PVC and its composites. It is shown that emulsion PVC swells less than suspension. However, the use of emulsion PVC during extrusion is difficult due to its low stability. For stable suspension PVC valid die swell up 1,10 1,27 180oC.

In the literature there is no information about the effect of the introduced in PVC materials of polymer additives on the degree of swelling of the extrudate.

There are a large number of stabilizers for improving the light stability of PVC compositions (4). However, they do not affect the ratio of extrudate swell of.

The known method Uwe or their mixtures with light stabilizers (5). However, this method does not allow to obtain compositions with a low coefficient of swelling of the extrudate.

Known polymer composition, comprising, by weight.h. suspension PVC 20 80, microsuspension PVC with a particle size of the powder of 0.8 9 μm and a specific surface area of 2 to 10 m2/g 20-80, thermo stabilizer 1-4,5 and lubrication of 0.1-2 (6). The polymer composition can be applied to obtain profiles. The rate of change of the white sample is 0.20 to 0.60, the ratio of extrudate swell of 1,32 1,38.

Closest to the technical essence and the achieved effect to the present invention is a polymeric composition used, for example, to obtain profiles for Windows, panels for walls and so on (7). The polymer composition comprises, by weight. including suspension PVC 50-70,thermo stabilizer 2-5 and modifier suspension PVC 30-50 from 10 to 30 wt. the adsorbed copolymer,30 to 35 wt. piperylene, 30 to 35 wt. butadiene (BD) and 30 to 40 wt. styrene (ST). The rate of change of the white samples 0,60 0,72 (after socotrine in weatherometer for 75 h), the ratio of extrudate swell of 1,18 1,22 (see tab. example No. 19).

The technical result of the invention is to increase the light resistance (the degree of change white) when save is stabilizator and modifier, contains as a modifier of the grafted copolymer of 2 to 60 wt. vinyl chloride (I) 40 to 98 wt. rubber elastomer containing links, wt. 67 74 DB and 26 ARTICLE 33, the following ratio, wt.h.

PVC 100

Thermo stabilizer 1 6

Specified graft copolymer of 3 to 20.

As PVC polymer composition contains, for example, PVC block brand M-O beyond 6 01 678 86, PVC suspension marks-M, M, G according to GOST 14332 78. Thermo stabilizer, for example, a mixture of barium stearate (CTV, TU 6 09 281 75) and cadmium stearate (CCd, TU 6 09 7 76), STV, Cd and trehosnovnogo sulfate lead (Tossa, TU 6 09 4098 75), STV, d and dibasic stearate lead (DOSS, TU 6 09 3928 - 75).

The modifier obtained by the staff of the Institute of polymers as follows. In a reactor with a capacity of 200 l load 6 kg 0,90 crumb rubber elastomer: copolymer DB-ST on THE 38.40327-90 mass ratio of links 74 67:26 33, 5 12 g of the initiator ammonium persulfate, 0,9 6 g of ionol, 60 kg of water and 68 340 g of protective colloid methylcellulose. The vacuum reactor to 160 mm RT.article Then it is dosed 60 kg of liquid REF. The contents of the reactor are stirred for 1 h at 18 of 25oC. Heat the reactor up to 70oC and carry out the process within 2 to 10 o'clock the Next floor product is dried in a vacuum Cabinet at a temperature of 505oC. In the polymerization receive a product with a particle size of 20 to 100 μm - grafted copolymer of 2 to 60 wt. I 40 to 98 wt. rubber elastomer containing links, wt. 67 74 DB and 33 ARTICLE 26. The composition of the grafted copolymer is determined by fractionation in dimethylformamide and toluene, the number of input in the grafted copolymer content of chlorine (GOST 14040 82), the average particle size by electron microscope (8).

In the polymer compositions specified grafted copolymer was not used.

Comparative analysis of the proposed technical solutions to the prototype allows us to conclude that the inventive polymer composition is different from the known use in her new component modifier grafted copolymer of 2 to 60 wt. I 40 to 98 wt. rubber elastomer containing links, wt. 67 74 DB and 33 ARTICLE 26. Thus, the proposed solution meets the criterion of "novelty". The analysis of other known polymer compositions showed that a sign that distinguish the claimed technical solution is not revealed in these inventions, and such property, showing the proposed polymer composition, as light resistance (the degree of change white) exceeds SV is imago technical solutions to the criterion of "inventive step".

Use as part of the proposed polymer composition 3 to 20 wt.h. modifier grafted copolymer of 2 to 60 wt. I 40 to 98 wt. rubber elastomer containing links, wt. 67 74 DB and 33 26 ARTICLE increases the light stability: the rate of change of whiteness is 0,88 0,90 (after socotrine in weatherometer for 1500 h) and keeps good processability: the ratio of extrudate swell of 1,18 1,21 (see tab.examples NN 1 18).

The essence of the invention is illustrated by the following examples.

Example 1. 100 wt.h. PWHM-O, 0.2 wt.h. StW, 0,8 wt.h. Cd and 3 wt. including grafted copolymer (SP) 2 wt. I 98 wt. rubber elastomer containing links, wt. 67 DB and ARTICLE 33, mix in turbomachine at a temperature of 90owithin 30 minutes the mixture rolls at a temperature of 175oC for 6 minutes Then rolled film thickness of 0.5 mm are pressed at a temperature of 180oC 5 min.

The degree of change in brightness is determined on the samples HH mm as the ratio of the values of whiteness before and after light aging in weatherometer over 1500 hours Whiteness of the samples measured gloss FB-2.

The resulting composition have also capillary viscometer is another 3 to 5 cm and measure their diameter. Calculate the ratio of extrudate swell of as the ratio of the diameter of the resulting rod polymer to the diameter of the capillary.

The properties of the composition given in the table.

Examples N 2 18 according to the invention.

Examples N 19 24 for comparison.

The compositions and properties of the polymer compositions shown in the table. Modes of sample preparation and testing methods analogous to example No. 1.

From the table it is seen that the use in the composition of the proposed polymer composition 3 to 20 wt.h. the grafted copolymer of 2 to 60 wt. I 40 to 98 wt. rubber elastomer, consisting of 67 74 wt. DB and 26 to 33 wt. ARTICLE increases the light stability: the rate of change of whiteness is 0,88 0,90; while the ratio of extrudate swell of equal 1,18 1,21 (see examples 1 to 18). Reducing the number of grafted copolymer in the composition, and changing the content of monomers outside the proposed limits reduces the light fastness of samples: degree of change in brightness is 0,79 0,80; while the ratio of extrudate swell of increases (see examples NN 20 23). Use in the composition of the polymeric composition, for example, copolymer DB-ST (30 wt. ST) leads to a similar resuest components.

Physico-mechanical parameters of the proposed composition as follows: yield strength tensile 46 49 MPa, elongation at break 80 - 145% softening temperature by Vic 75oC.

Polymer composition comprising polyvinyl chloride, a metal-containing thermo stabilizer and modifier, characterized in that it contains as a modifier of the grafted copolymer of 2 to 60 wt. vinyl chloride at 40 to 98 wt. elastomer containing 67 74 wt. parts of butadiene and 26 to 33 wt. parts of styrene, in the following ratio, wt.h.

Polyvinyl chloride 100

Metal-containing thermo stabilizer 1 6

Modifier 3 20,

 

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