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Method for preparing high impact modified material with waste and old polystyrene plastics

A technology for waste polystyrene and modified materials, which is applied in the field of waste polystyrene recycling and modification, can solve the problems of reducing the rigidity and strength of materials, and achieve the effects of increasing tensile strength, increasing impact strength and improving impact strength.

Inactive Publication Date: 2008-12-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while the addition of rubber improves the impact toughness of the material, it greatly reduces the rigidity and strength of the material, so that the waste polystyrene recycled after rubber toughening and modification can only be used to make packaging materials, daily necessities, etc. end products

Method used

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  • Method for preparing high impact modified material with waste and old polystyrene plastics
  • Method for preparing high impact modified material with waste and old polystyrene plastics
  • Method for preparing high impact modified material with waste and old polystyrene plastics

Examples

Experimental program
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Effect test

Embodiment 1

[0036] First, 72 parts of waste polystyrene with a melt index of 20g / 10min, 10 parts of styrene-butadiene rubber, 8 parts of high-density polyethylene with a melt index of 5.5g / 10min, styrene-ethylene-butadiene-styrene copolymer 10 parts and 0.001 parts of antioxidant 1076 were stirred and mixed evenly, then put into a twin-screw extruder, and melted and blended at the temperatures of 150°C, 170°C, 190°C, 210°C, 210°C, and 200°C respectively to obtain increased Toughened modified waste polystyrene material. The notched impact strength measured by the material is 9.27KJ / m 2 , The tensile strength is 24.13MPa.

Embodiment 2

[0038] First, 60 parts of waste polystyrene with a melt index of 23g / 10min, 28 parts of natural rubber, 5 parts of high-density polyethylene with a melt index of 3.0g / 10min, and 7 parts of styrene-isoprene-styrene thermoplastic elastomer 1010 and 0.002 parts of antioxidant 1010 were stirred and mixed evenly, then put into a twin-screw extruder, and melted and blended at the temperatures of 150°C, 170°C, 190°C, 210°C, 210°C, and 200°C to obtain toughening Modified waste polystyrene material. The notched impact strength measured by the material is 10.22KJ / m 2 , The tensile strength is 23.12MPa.

Embodiment 3

[0040] First, 80 parts of waste polystyrene with a melt index of 12g / 10min, 10 parts of polyolefin elastomer POE, 6 parts of ultra-high molecular weight polyethylene recycled materials with a melt index of 6g / 10min, 4 parts of styrene grafted ethylene copolymer and Stir and mix 0.003 parts of antioxidant 1010 evenly, then put it into a single-screw extruder, melt and blend at the temperatures of 150°C, 170°C, 190°C, 210°C, 210°C, and 200°C in each zone to obtain toughening modification Waste polystyrene material. The notched impact strength measured by the material is 8.12KJ / m 2 , The tensile strength is 25.55MPa.

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Abstract

The invention discloses a method for preparing high-impact modified material from waste polystyrene plastic, which comprises the following steps: uniformly mixing 60 to 80 parts of waste polystyrene, 5 to 10 parts of polyethylene, 10 to 30 parts of elastomer, compatibilizer, etc. by stirring, adding to a screw extruder, and melting and blending at 150 to 210 DEG C, wherein the melt index ratio of polyethylene to polystyrene is equal to or less than 0.5. Due to the addition of small amount of polyethylene, the viscosity ratio of polyethylene to polystyrene and the crystallization behavior and the phase size of polyethylene can be controlled by restricting the melt index of waste polystyrene and polyethylene, so that the obtained modified material has a notched impact strength 8 to 10 times as high as that of original waste polystyrene and can maintain or even improve the tensile strength of polystyrene. The prepared modified polystyrene can be used for producing parts of middle- and high-level household appliances such as computer and air conditioner as the substitute of high-impact polystyrene new material, thus achieving remarkable social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of recycling and modification of waste polystyrene, and in particular relates to a method for preparing high-impact modified materials by using waste polystyrene plastics. Background technique [0002] Polystyrene (PS) has the advantages of transparency, good formability, good rigidity, easy dyeing, low moisture absorption and low price, and has been widely used in industries such as packaging, electronics, construction, automobiles, home appliances, instruments, daily necessities and toys . However, because polystyrene is difficult to degrade, waste materials such as polystyrene and expanded polystyrene are increasing day by day, which not only causes serious pollution to the environment, but also forms a great waste of resources, especially in the growing shortage of oil today. [0003] In order to solve the pollution caused by waste polystyrene plastics to the environment and make full use of resources,...

Claims

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Application Information

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IPC IPC(8): C08L25/06C08L23/06B29B7/28C08L23/08C08L23/16C08L9/06C08L9/00C08L7/00
Inventor 傅强付晓婷陈枫张琴杜荣妮
Owner SICHUAN UNIV
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