A method for improving the performance of polypropylene-based thermoplastic vulcanizate

A technology based on thermoplastic vulcanizate and polypropylene, which is applied in the field of improving the performance of polypropylene-based thermoplastic vulcanizate. It can solve the problems of complex methods for performance improvement, many affected factors, and lack of universality. It is easy to implement, Simple operation and precise effects

Active Publication Date: 2021-01-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method to achieve performance improvement in the preparation process is relatively complicated, with many affected factors, and most of them are not universal

Method used

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  • A method for improving the performance of polypropylene-based thermoplastic vulcanizate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The basic composition and mass parts of the selected raw materials are as follows:

[0025] 100 parts of EPDM / PP thermoplastic vulcanizate;

[0026] Aromatic amides (TMB-5) 0.1 parts.

[0027] According to the above formula, the preparation steps are as follows:

[0028] (1) Addition of nucleating agent: mix thermoplastic vulcanizate and nucleating agent in proportion, and then put them in a twin-screw for melt blending and granulation, wherein the temperature condition is 200°C and the rotation speed is 300rpm;

[0029] (2) Thermal processing: the mixture obtained in step (1) is subjected to high-temperature thermal processing at a temperature of 200° C. for 10 minutes;

[0030] (3) Cooling process control: cool the product obtained in step (2) to a certain temperature at a cooling rate of 20°C / min, set the temperature to 135°C, and hold for 10 minutes;

[0031] (4) Cooling and setting: Cool and set the obtained product in step (3) at a temperature of 35° C. for 5 m...

Embodiment 2

[0036] The basic composition and mass parts of the selected raw materials are as follows:

[0037] POE / PP thermoplastic vulcanizate 100 parts;

[0038] Rare earth β-nucleating agent (WBG) 1 part;

[0039] According to the above formula, the preparation steps are as follows:

[0040] (1) Addition of nucleating agent: mix thermoplastic vulcanizate and nucleating agent in proportion, and then put them in a twin-screw for melt blending and granulation, wherein the temperature condition is 200°C and the rotation speed is 300rpm;

[0041] (2) thermal processing: the mixture obtained in step (1) is thermally processed at a high temperature at a temperature of 200° C. for 10 minutes;

[0042] (3) Cooling and shaping: the product obtained in step (2) was cooled and shaped at 40° C. for 5 minutes.

[0043] The sample was pressed into a 2mm thick sheet according to the standard and the performance was tested. The performance is shown in Table 1.

Embodiment 3

[0047] The basic composition and mass parts of the selected raw materials are as follows:

[0048] 100 parts of NBR / PP thermoplastic vulcanizate;

[0049] Aromatic amide (TMB-5) 2 parts;

[0050] According to the above formula, the preparation steps are as follows:

[0051] (1) Addition of nucleating agent: mix thermoplastic vulcanizate and nucleating agent in proportion, then place them in twin-screws for melt blending and granulation, wherein the temperature conditions are 200°C and the rotational speed is 500rpm;

[0052] (2) Thermal processing: the mixture obtained in step (1) is subjected to high-temperature thermal processing at a temperature of 200° C. for 10 minutes;

[0053] (3) Cooling process control: quickly cool down the product obtained in step (2) to a certain temperature at a cooling rate of 25°C / min, set the temperature to 125°C, and hold for 20 minutes;

[0054] (4) Cooling and setting: Cool and set the obtained product in step (3) at a temperature of 55° C....

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Abstract

The invention discloses a method for improving the performances of a polypropylene-based thermoplastic vulcanized rubber. The method comprises the following steps: mixing the prepared thermoplastic vulcanized rubber with a nucleating agent, and regulating the crystal form content in the obtained material by a post-processing technique. The effect of the nucleating agent in the thermoplastic vulcanized rubber is controlled to change the crystal form structure of a continuous phase in the thermoplastic vulcanized rubber. The crystal form is regulated to further improve the elasticity and mechanical properties of the material, so improvement of the performances of the thermoplastic vulcanized rubber in the post-processing process is achieved. The method has the advantages of simple process and strong operability, and is generally suitable for polypropylene-based thermoplastic vulcanized rubbers.

Description

technical field [0001] The invention relates to the field of polymer materials, and furthermore, relates to a method for improving the performance of polypropylene-based thermoplastic vulcanizate. Background technique [0002] Thermoplastic vulcanizate (TPV) is a special thermoplastic elastomer obtained by dynamic vulcanization reaction processing technology. When a large amount of rubber phase and a small amount of plastic phase are melt blended, the rubber phase is chemically crosslinked under the action of the crosslinking agent, and the viscosity increases. At the same time, under the action of high temperature and mechanical shear, the rubber plastic melt blend undergoes phase inversion , a large amount of rubber phase is broken into micron particles and uniformly dispersed in a small amount of plastic phase, finally forming a special sea-island structure. This special structure makes thermoplastic vulcanizate not only have the elasticity and softness of traditional ru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/16C08L23/12C08L23/08C08L9/02C08K5/20C08K3/08
CPCC08L9/02C08L23/0815C08L23/12C08L23/16C08L2205/24C08L2205/242C08K5/20C08K3/08
Inventor 田明沈昱岑宁南英张立群王瀚彬
Owner BEIJING UNIV OF CHEM TECH
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