Method for raising fluidity of thermoplastic cross-linked rubber

A thermoplastic vulcanizate and fluidity technology, applied in the field of dynamic full vulcanization technology to prepare thermoplastic vulcanizate by melt blending, can solve the problems of increased hardness and compression deformation, decreased elasticity, etc., to improve fluidity and ensure dynamic vulcanization time Effect

Active Publication Date: 2007-02-21
SHANDONG DAWN POLYMER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented method allows for better control over the properties of an elastomer used during manufacturing processes like tire production. By adding certain chemical substances or polymer resins into this process at different stages of mixing, there may be more evenly distributed throughout the final product with improved physical characteristics compared to previous methods that had only limited success rates due to lack of homogeneous distribution across all components being mixed.

Problems solved by technology

This technical problem addressed in this patents relates to making highly viscous polymers called Thermo Plaspehytanozone Rubbers ("TPI"), specifically known as dynamically vulcanizable rubbers, while maintaining good heat transfer capabilities like thermal conductivity. Previous techniques have had limitations in terms of producing stable products containing fine rubber powder mixed uniformly throughout. These previous processes resulted in decreased product quality and increased costs compared to current manufacturing practice.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An ethylene-propylene-diene monomer / polypropylene (EPDM / PP) blended thermoplastic vulcanizate with a rubber-to-plastic ratio of 60 / 40 was prepared (the plastics involved in premixing accounted for 30% of the total plastics).

[0023] The operation steps are as follows:

[0024] 1) Mix the plastics added for the first time: 20 grams of polypropylene, 0.67 grams of antioxidant (grade 1010) and rubber: 100 grams of EPDM rubber in a double-roller plastic mixer at 170 ° C (about 3 minutes ) to obtain the rubber-plastic premix, for subsequent use.

[0025] 2) Put the rubber-plastic premix prepared in the previous step into an internal mixer, add processing aids: 1.0 g of stearic acid, filler: 40 g of white carbon black, and knead for 1.5 minutes according to the rubber mixing method. Add softener: 100 grams of naphthenic oil, continue mixing for 2.5 minutes, finally add vulcanizing agent: 3 grams of dicumyl peroxide and accelerator: 1 gram of triallyl isocyanurate (TAIC) and...

Embodiment 2

[0029] Prepare a butyl rubber / polypropylene (IIR / PP) blended thermoplastic vulcanizate with a rubber-to-plastic ratio of 80 / 20 (the plastics involved in premixing account for 50% of the weight of the total plastics).

[0030] 1) Mix the plastics added for the first time: 12.5 grams of polypropylene, 0.25 grams of antioxidant (grade 1010) and rubber: 100 grams of butyl rubber at 170°C (about 3 minutes) to obtain a rubber and plastic premix, spare.

[0031] 2) Put the rubber-plastic premix prepared in the previous step into the internal mixer, add processing aids: 1.0 g of stearic acid, 40 g of filler: clay, knead for 1.5 minutes, and then add softening Agent: 100 grams of naphthenic oil, continue mixing for 2.5 minutes, finally add vulcanizing agent: 10.0 grams of tert-octyl phenolic resin and accelerator: 2.0 grams of stannous chloride and continue mixing for 1.5 minutes to make a vulcanization reaction material, which is set aside.

[0032] 3) Put the vulcanization reaction ...

Embodiment 3

[0035] Prepare a natural rubber / polyethylene (NR / PE) blended thermoplastic vulcanizate with a rubber-to-plastic ratio of 20 / 80 (the plastics involved in premixing account for 40% of the total plastic weight).

[0036] 1) Mix the plastics added for the first time: 160 grams of polyethylene, 4.0 grams of antioxidant (grade 1010) and rubber: 100 grams of natural rubber at 170°C (about 3 minutes) to obtain a rubber and plastic premix, which is set aside.

[0037] 2) Put the rubber-plastic premix prepared in the previous step into the internal mixer, add processing aids: 1.0 g of stearic acid, 40 g of filler: silica, mix for 1.5 minutes, and then add Softener: 100 grams of mixed oil of naphthenic oil and paraffin oil (mixing ratio is naphthenic oil: paraffin oil = 1: 1), continue mixing for 2.5 minutes, and finally add vulcanizing agent: 10.0 grams of tert-octyl phenolic resin and accelerator Agent: 2.0 grams of tin protochloride and continue mixing for 1.5 minutes to make a vulcan...

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PUM

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Abstract

This invention relates to a method for improving the fluidity of thermoplastic vulcanized rubber. The method comprises: (1) pre-mixing rubber with plastic (30-50% of total plastic); (2) mixing the premixed rubber with the rest plastic; (3) dynamically vulcanizing; (4) adding dicumyl peroxide (1-4% of the second plastic addition), melting and mixing to obtain the thermoplastic vulcanized rubber. The fluidity of the thermoplastic vulcanized rubber is largely improved, while its physical and mechanical properties are maintained.

Description

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Claims

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Application Information

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Owner SHANDONG DAWN POLYMER CO LTD
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