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Toughened polystyrene composite and preparation method thereof

A polystyrene and composition technology, which is applied in the field of rubber-modified polymer toughening polystyrene compositions, can solve the problems of limited toughening effect and the like, and achieve the effects of low hygroscopicity, simple polymerization process, and easy molding and processing.

Active Publication Date: 2010-06-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In current research, there are also rubber-toughened polystyrene compositions with small particle diameters, such as the rubber-modified polystyrene resin whose patent publication number is US5491195. The rubber particle diameter is between 0.1 and 1 μm, which can form The above-mentioned entanglement or concentric shell structure, but this toughening method is not conducive to the occurrence of silver cracks in the impact process because of the absence of large-diameter rubber particles, so the toughening effect is limited

Method used

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  • Toughened polystyrene composite and preparation method thereof
  • Toughened polystyrene composite and preparation method thereof
  • Toughened polystyrene composite and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031]Add 114.7g of high-cis butadiene rubber 1 (BR-9004, produced by Yanshan Petrochemical), 1700g of styrene (produced by Yanshan Petrochemical) and 10761.8g of anti-aging agent into the kettle, and use a double-ribbon stirrer to stir evenly at a stirring rate of 170rpm , swell at 35°C for 8 hours, and then add 300 g of ethylbenzene into the kettle. 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 138 rpm, and the polymerization was carried out at 120° C. for 4 hours, at 130° C. for 2 hours, and at 157° C. for 1.5 hours. After the polymerization process is completed, the viscous body obtained from the polymerization is discharged and entered into a devolatilizer at 232°C, where it is quickly flashed in a vacuum state to remove unreacted monomers and solvent ethylbenzene. Af...

Embodiment 2

[0033] Reduce the stirring speed to 105rpm, and other conditions are the same as in Example 1. The mechanical test results show that the tensile yield strength is 34.6MPa, and the impact strength of the cantilever beam is 17.3kJ / m 2 , the melt index is 4.74g / 10min, the results are shown in Table 1.

Embodiment 3

[0035] Reduce butadiene rubber content to 103g, other conditions are identical with embodiment 1. The results of the mechanical test show that the tensile yield strength is 38MPa, and the impact strength of the cantilever beam is 16.6kJ / m 2 , the melt index is 3.71g / 10min, the results are shown in Table 1.

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Abstract

The invention relates to a toughened polystyrene composite and a preparation method thereof, in particular to a toughened polystyrene composite of rubber modified polymer, wherein the sizes of particle diameters of the rubber modified polymer has the characteristic of multi-stage distribution. The rubber particles with the particle diameters of 0.1-0.3mu m account for 0.5-2% of the total rubber content, rubber particles with the particle diameters of 0.3-1mu m account for 2-20% of the total rubber content, and the rubber particles with the particle diameters of more than 1mu m account for 78-97.5% of the total rubber content; and the rubber particles form a distribution form with multiple particle diameters in polystyrene matrix, and the rubber particles with the various particle diameters are evenly distributed inside the polystyrene matrix. By adopting the rubber toughened polystyrene composite with the multiple particle diameters, the toughening effect is improved by 70%, and the tensile yield strength is also obviously improved. Furthermore, the melt index of the polymer can be improved by the ways such as adding mineral oil and the like, and the flow property of the polymer is enhanced.

Description

technical field [0001] The present invention relates to a kind of toughened polystyrene composition and preparation method thereof, more specifically, the present invention relates to a kind of rubber-modified polymer toughened polystyrene composition, wherein the particle size of rubber-modified polymer Characterized by a multilevel distribution. Background technique [0002] Polystyrene (PS) is a large variety of synthetic resins that are widely used at present. It has excellent properties such as coloring, transparency, electrical insulation, and processing fluidity. It has a wide range of applications in various fields of industry and civil use. One of the four general-purpose plastics. However, the inherent structure of polystyrene resin determines its lack of mechanical properties, such as insufficient strength, poor toughness, etc., especially its brittle behavior, which greatly limits its application range. In particular, its application in high-impact products is ...

Claims

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Application Information

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IPC IPC(8): C08F279/02
Inventor 王洪涛史新波斯维张晓尘宋文波张洪波
Owner CHINA PETROLEUM & CHEM CORP