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Tough-increased and reinforced modification method of PS

A toughening and modification technology, applied in the field of PS toughening and strengthening modification, can solve the problems of material rigidity reduction and decline; Tang Weihua and other problems, to achieve the effect of improving environmental resistance, improving mechanical properties and increasing economic costs

Inactive Publication Date: 2010-12-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gu Zhongyun et al. (Gu Zhongyun, Ma Yuzhen, Lei Weihua. Special Rubber Products, 2001, 22(6): 32-34) found that silicone rubber can significantly increase the blend strength through silicone rubber / PS blending; Zhang Baowei (Zhang Baowei, Sun Xilong. Research on the properties of rubber powder / polystyrene blends [J]. Rubber Industry, 2003, 50(9): 529-531) found that adding rubber powder can improve the impact resistance of PS materials , but it will reduce the tensile strength of the blend; Tang Weihua et al. The effect of mixing on the mechanical properties of PS
The results show that the impact strength of the blended alloy is more than 17 times higher than that of the PS matrix, while the stiffness of the material is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh a certain quality of Shunda PIB-8450, process the mixture with the ratio of PIB / PS=10 / 90 at 165-185°C to process the masterbatch with a mass percentage of PIB of 10%, and then mix the masterbatch Prepare 2% (PIB accounts for 2% of the total mixture, and the rest is PS) mixture, and dry the prepared pellets at 80-100° C. for 8-10 hours for use. The extruded pellets were injected into specimens at 180-200°C to measure their mechanical properties.

[0020] The above PIB is: Shunda PIB-8450, the molecular weight is 40000-50000;

[0021] The above PS is: PS: D999, Beijing Yanshan Branch of China Petroleum & Chemical Corporation.

[0022] The tensile strength is tested according to the GB / T1040-1992 standard. The sample type is I, and the sample size is (mm): 150×(10±0.2) (end width)×(4±0.2) (thickness). The elastic modulus is 2.56MPa, and the tensile strength is 39.31MPa; the notched impact strength is tested according to the GB / T1043-1993 standard, the sample type i...

Embodiment 2

[0024] Weigh a certain quality of Shunda PIB-8450, process the mixture with the ratio of PIB / PS=10 / 90 at 165-185°C to process the masterbatch with a mass percentage of PIB of 10%, and then mix the masterbatch Prepare 8% (PIB accounts for 8% of the total mixture, the rest is PS) mixture, and dry the prepared pellets at 80-100° C. for 8-10 hours for use. The extruded pellets were injected into specimens at 180-200°C to measure their mechanical properties.

[0025] The above PIB is: Shunda PIB-8450, the molecular weight is 40000-50000;

[0026] The above PS is: PS: D999, Beijing Yanshan Branch of China Petroleum & Chemical Corporation.

[0027] The tensile strength is tested according to the GB / T1040-1992 standard. The sample type is I, and the sample size is (mm): 150×(10±0.2) (end width)×(4±0.2) (thickness). The elastic modulus is 2.47MPa, and the tensile strength is 33.4344MPa; the notched impact strength is tested according to the GB / T1043-1993 standard, the sample type is ...

Embodiment 3

[0029] Weigh a certain mass of Shunda PIB-8650, and process the mixture with the ratio of PIB / PS=10 / 90 at 165-185°C to make a masterbatch with a mass percentage of PIB of 10%, and then mix the masterbatch Prepare 8% (PIB accounts for 8% of the total mixture, and the rest is PS) mixture, and dry it at 80-100°C for 8-10 hours before use. The extruded pellets were injected into specimens at 180-200°C to measure their mechanical properties.

[0030] The above PIB is: Shunda PIB-8650, the molecular weight is 60000-70000;

[0031] The above PS is: PS: D999, Beijing Yanshan Branch of China Petroleum & Chemical Corporation.

[0032] The tensile strength is tested according to the GB / T1040-1992 standard. The sample type is I, and the sample size is (mm): 150×(10±0.2) (end width)×(4±0.2) (thickness). The elastic modulus is 2.56MPa, and the tensile strength is 39.08MPa; the notched impact strength is tested according to the GB / T1043-1993 standard, the sample type is type I, and the sam...

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Abstract

The invention discloses a modification method for plasticizing and reinforcing polystyrene (PS). The method is as follows: polyisobutene is added into the polystyrene, and granular materials the mass fraction of the polyisobutene of which is between 0.1 and 50 percent are obtained through extruding processing, namely the materials required are obtained. Compared with the prior art, the modification method for the PS is simple and convenient, and can improve the mechanical property, the environment resistance, the weathering resistance and so on when simultaneously maintaining the properties of the polystyrene. Moreover, the amount of PIB used as a modifier is small, thereby the modification method can not obviously increase the economic cost and has high economic benefit.

Description

(1) Technical field [0001] The invention relates to plastic modification, in particular to PS toughening and strengthening modification. (2) Technical background [0002] Polystyrene (PS) is the third largest variety of general-purpose plastics. It has the advantages of excellent coloring, transparency, electrical insulation and low price. Therefore, it is widely used in industries such as packaging, electronics, construction, automotive appliances, instruments, daily necessities, and toys. However, polystyrene is brittle, has poor environmental stress cracking resistance and solvent resistance, and has low impact strength. Its application range is greatly restricted. Therefore, it is of great significance to modify PS, especially its toughening modification. [0003] So far, most of the toughening of polystyrene has been achieved by using rubber-like elastomers as toughening agents. Xia Xinjiang et al. (Xia Xinjiang, Wang Lianshi, Gu Weimin, etc. China Plastics, 1998, 12 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/22B29C47/92C08L25/06B29B9/12C08J3/22B29C48/92
CPCB29C48/92B29C2948/92704B29C2948/92895
Inventor 王德海马国杰贺锡挺蒋辉
Owner ZHEJIANG UNIV OF TECH
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