Plasticised polyvinyl chloride-based polymer composition for film material

FIELD: chemistry.

SUBSTANCE: plasticised polymer composition for film material contains polyvinyl chloride, dioctyl phthalate, epoxidised plant oil, calcium stearate, zinc stearate, and 4-methyl-2,6-isobornylphenol as a stabiliser-oxidant.

EFFECT: high thermal stability of the polymer composition while maintaining high breaking strength and elongation at rupture.

1 tbl

 

The invention relates to the field of chemical technology of polymer materials, particularly to plasticized compositions based on polyvinyl chloride, and may be used to produce non-toxic plasticized film materials for food and medical purposes.

In the processing of PVC compositions of the polymer as a result of exposure to high temperatures and high mechanical loads undergoes irreversible degradation. To prevent thermomechanical degradation in the composition administered various stabilizing additives [K.S. K.S. Minsker, Fedoseeva G.T. Degradation and stabilization of PVC. M. Chemistry, 1979, 272 S.], which slow down the aging process of the polymer ("average time of thermal stability") and increase color retention (figure svetostoyjkostj").

Special requirements to the stabilizing additives arise in the case of non-toxic PVC-compositions intended for materials in contact with food products or medical products. The range of non-toxic stabilizing additives is very limited and most importantly they usually are stabilizing compounds with low efficiency. This creates significant problems in the processing of non-toxic compositions. The most important indicator of the quality of the polymer film material Nar is remote from photochemical stability is its svetostoyjkostj.

Known non-toxic polymer composition [TU 6-05-1533-85. The plasticized granulated medical type PM-1/42, 1999] for the production of containers for infusion solutions based on polyvinyl chloride, with the following ratio of components (parts by weight):

Polyvinyl chloride100
The dioctylphthalate54
Epoxydecane vegetable oil3
Calcium stearate0,8
The zinc stearate0,2

A disadvantage of known composition are its low thermal stability and svetostoyjkostj in the processing conditions while exposed to high temperatures, mechanical loads and oxygen-related absence in the formulation of the stabilizer is an antioxidant.

Closest to the claimed technical essence and the achieved result is plasticized polymer composition [RF Patent №2155581, CL A61K 9/08, A61K 31/05, A61L 31/00, publ. 10.09.2000.] for the manufacture of containers for infusion solutions on the basis of polyvinyl chloride containing as a plasticizer on octylphthalate and additionally as a stabilizer, antioxidant - 4-methyl-2,6-isobutylphenyl (BHT), with the following content of components (parts by weight):

Polyvinyl chloride100
The dioctylphthalate40-45
Epoxydecane vegetable oil3-10
Calcium stearate0,6-10
The zinc stearate0,35-0,7
4-methyl-2,6-di-tert-butylphenol (BHT)the 0.05-0.1

However, this known composition is characterized by low thermal stability and svetostoyjkostj. Low rates of thermal stability and svetostoyjkostj specified compositions involve the use of stabilizer and the antioxidant BHT, which under conditions of thermomechanical processing of polymeric compositions, due to their own high volatility, ineffective.

The purpose of the invention is the improvement of thermal stability and svetostoyjkostj plasticized polymeric compositions based on polyvinyl chloride film material

This goal is achieved in the proposed plasticized polymer comp the positions, containing polyvinyl chloride, dioctylphthalate, epoxydecane vegetable oil, calcium stearate, zinc stearate, and as a stabilizer, antioxidant - 4-methyl-2,6-isobornylphenol, in the following ratio, parts by weight:

Polyvinyl chloride100
The dioctylphthalate40-60
Epoxydecane vegetable oil2,5-10
Calcium stearate0,5-1,0
The zinc stearate0,2-0,6
4-methyl-2,6-isobornylphenol0,05-0,1,

4-methyl-2,6-isobornylphenol belongs to the class of terpenophenolic, Brutto-formula - C27H40O. the Molar mass - 380. The melting point of 201°C.

The principle of action of antioxidant-terpineol depends on the chemical nature of the polymer. For example, in the case of polypropylene terpineol slows the process of oxidation of macromolecules of the polymer. In plasticized polymeric compositions based on PVC principle phenolic antioxidant another. In the case of PVC compound antioxidant protects clonaepam the initial plasticizer from oxidation, which in turn is due to solvation stabilization slows down the process of dehydrochlorinated polyvinyl chloride, thereby enhancing thermal stability of the polymer (a known effect of "echo-stabilization" PVC) [K.S. K.S. Minsker, Abdullin M.I. the Effect of "echo-stabilization" upon thermal decomposition of polyvinyl chloride. // Reports of USSR Academy of Sciences. - 1982. - T. No. 1. - P.140-143]. At the same time slow down dehydrochlorinated PVC leads also to increase its svetostoyjkostj.

The invention is illustrated by the following examples, presented below and in the table.

Example 1. The composition comprising: polyvinyl chloride - 100 g (100 parts by weight); dioctylphthalate - 40 g (40 parts by weight); epoxydecane vegetable oil and 2.5 g (2.5 parts by weight); calcium stearate and 0.5 g (0.5 parts by weight), zinc stearate and 0.2 g (0.2 parts by weight) and 4-methyl-2,6-isobornylphenol - 0,05 g (0.05 parts by weight) is prepared by mixing the components in the mixer for 30 min at a temperature of 100°C. the Obtained plasticized polymer composition is processed in a film thickness of 0.4 mm valcheva-calender method at 160-170°C.

Indicators of the strength at break and elongation at break was determined in accordance with GOST 14236-81. The indicator "time of thermal stability of the composition was determined by indicator method "Congo-mouth" in accordance with GOST 14044-68. Svetostoyjkostj assessed visually on time to the effect dyeing of the film at termexposure (180°C). Photochemical stability of polymeric material is characterized by its stability against ultraviolet radiation during operation. In turn, svetostoyjkostj polymeric material characterized by its stability during thermomechanical processing at the production stage. The composition and properties of the finished material presented in the table.

Introduction 4-methyl-2,6-isobornylphenol less than 0.05 parts by weight leads to a decrease in thermal stability and svetostoyjkostj (example 11). Introduction 4-methyl-2,6-isobornylphenol more than 0.1 parts by weight leads to unnecessary expenditure of stabilizer is an antioxidant.

The proposed solution allows to increase thermal stability of plasticized polymeric compositions based on polyvinyl chloride film material in comparison with the prototype on 27-41%, and svetostoyjkostj on 14-57%, while maintaining high level of performance "tensile strength and elongation at break".

2 8,0
The composition and properties of the plasticized composition
The content of components, parts by weight, indicatorsExamplesThe placeholder
1345678910111213
Polyvinyl chloride100100100100100100100100100100100100100
The dioctylphthalate40455055606055504540506040
Epoxydecane vegetable oil2,55,07,010,010,08,07,05,02,55,06,06,0
Calcium stearate0,50,60,70,80,90,70,50,60,70,80,60,70,8
The zinc stearate0,20,250,30,350,350,30,30,350,350,30,20,30,4
4-methyl-2,6-di-tert-butylphenol (BHT)---- --------0,1
4-methyl-2,6-isobornylphenol0,050,060,070,080,090,10,050,060,070,080,030,12-
The tensile strength, kgf/cm2157159158164166164163159161159160162158
Elongation at break, %221225223227 222225224221223226223222223
The time of thermal stability, min., 175°C66686971727366677072487452
Svetostoyjkostj, min, 180°C45455050505545505555305535

Plasticized polymer composition based on polyvinyl chloride film material containing polyvinyl chloride, dioctylphthalate, epoxydecane vegetable oil, calcium stearate, with earth zinc, and as a stabilizer antioxidant contains 4-methyl-2,6-isobornylphenol in the following ratio of components, parts by weight:

Polyvinyl chloride100
The dioctylphthalate40-60
Epoxydecane vegetable oil2,5-10
Calcium stearate0,5-1,0
The zinc stearate0,2-0,6
4-Methyl-2,6-isobornylphenolthe 0.05-0.1



 

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