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Biaxially stretched polystyrene composition, preparation method and application

A polystyrene and biaxial stretching technology, applied in the field of biaxially oriented polystyrene composition, can solve the problems of easy fracture, hard GPPS, low impact strength, etc., and achieve simple polymerization process, good biaxial stretching ability, excellent Effect of Biaxial Tensile Properties

Active Publication Date: 2018-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] BOPS is made of general-purpose polystyrene (GPPS), but because GPPS is hard and brittle, it is easy to break and has low impact strength, which affects its application.

Method used

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  • Biaxially stretched polystyrene composition, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 8 g of star-shaped low-cis polybutadiene rubber 730AX (produced by Asahi Kasei Corporation, 5% styrene solution viscosity is 35 cP) at 25 ° C, 1700 g of styrene (produced by Yanshan Petrochemical) and 300 g of ethylbenzene into the kettle, Stir evenly, swell for 8 hours, then add 10760.1g of anti-aging agent.

[0032] The air in the kettle was replaced with nitrogen. The method of free radical polymerization is adopted for polymerization, and the initiation method adopts thermal initiation. The temperature of the polymerization tank was raised at a stirring rate of 170 rpm, and the polymerization was carried out at 120°C for 4 hours, at 130°C for 2 hours, and at 160°C for 1.5 hours. Keep the stirring rate at 170rpm during the polymerization process, complete the polymerization process, discharge the viscous body obtained from the polymerization into a devolatilizer at 210°C, and flash quickly under vacuum to remove unreacted monomers and solvent ethylbenzene . Th...

Embodiment 2

[0034] Star-shaped low-cis polybutadiene rubber 4016 (developed by Zhuhai Aosheng Company, 5% styrene solution viscosity is 32cP at 25°C) 8g, other process conditions are the same as in Example 1.

[0035] The obtained polymer after devolatilization was 1460g, the conversion rate of styrene was 85.4%, and the content percentage of butadiene rubber was 0.55% by weight. After cooling, granulating and sample preparation, the sample was obtained, and the physical properties were measured. The results obtained are shown in Table 1 and Table 2.

Embodiment 3

[0045] Adopt star-shaped low-cis polybutadiene rubber 730AX 20g, antioxidant 10760.2g, other process conditions are with embodiment 1.

[0046] The obtained polymer after devolatilization was 1460g, the conversion rate of styrene was 84.7%, and the content percentage of butadiene rubber was 1.36% by weight. After cooling, granulation and sample preparation, the sample was obtained, and the physical properties were measured. The results obtained are shown in Table 1 and Table 2.

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Abstract

The invention relates to a biaxial oriented polystyrene composition, a preparation method therefor and application of the biaxial oriented polystyrene composition. The biaxial oriented polystyrene composition contains polystyrene and polystyrene grafted cis-polybutadiene rubber, wherein in the polystyrene composition, the content of a cis-polybutadiene rubber unit is 0.1-1wt% that of a styrene unit. The preparation method for the composition comprises the steps: (1) dissolving the cis-polybutadiene rubber into styrene monomers; (2) initiating the self polymerization of the styrene monomers and the grafting of the styrene monomers to the cis-polybutadiene rubber through thermal initiation or by an initiator; and (3) after the polymerization ends, removing superfluous styrene monomers, thereby obtaining the biaxial oriented polystyrene composition. The biaxial oriented polystyrene composition can serve as a base material of biaxial oriented polystyrene sheets and films, and a toughening agent is not required to be added during processing, so that the biaxial oriented polystyrene composition has an industrial application prospect.

Description

technical field [0001] The invention relates to a biaxially stretched polystyrene composition, a preparation method and an application. Background technique [0002] Biaxially oriented polystyrene (BOPS) sheets and films are a new type of "green packaging material" developed in recent years. It has high strength, high rigidity, good transparency, convenient processing, easy coloring, and reliable heat sealing. The packaging products processed by it are stable in shape, beautiful and crisp, and have a good appearance display when packaging various handicrafts, tourism products, food, medicine, textiles, clothing and daily necessities, hardware commodities, stationery and fast food boxes. Effect and enhanced shelf impact performance. [0003] BOPS is made of general-purpose polystyrene (GPPS), but GPPS is hard and brittle, easy to break, and has low impact strength, which affects its application. At present, in the production of biaxially oriented polystyrene sheets or films...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L25/06C08L51/04C08F112/08C08F279/02C08F212/08C08F2/00
Inventor 张晓尘代增悦殷建军高达利斯维薛文龙于鲁强王洪涛
Owner CHINA PETROLEUM & CHEM CORP
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