Preparation and Properties of Reclaimed Rubber Based on Passenger Car Tire Tread Powder

doi:10.19894/j.issn.1000-0518.210536

Chinese Journal of Applied Chemistry ›› 2023, Vol. 40 ›› Issue (1): 52-58.DOI: 10.19894/j.issn.1000-0518.210536

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Preparation and Properties of Reclaimed Rubber Based on Passenger Car Tire Tread Powder

Jing YAO¹^,²(), Ming-Ming DAI¹

^1.China Iron & Steel Research Institute Group，Beijing 100081，China
^2.School of Agricultural Economics and Rural Development，Renmin University of China，Beijing 100872，China

Received:2021-11-15 Accepted:2022-08-26 Published:2023-01-01 Online:2023-01-28
Contact: Jing YAO
About author:1148118202@qq.com
Supported by:
Beijing Science and Technology Project(Z161100001216003)

Abstract

Abstract:

Reclaimed rubbers are prepared by mechanochemical regeneration method using waste tire rubber powder as raw materials. The effect of different dosages of activator 420 on the properties of reclaimed rubbers is studied. With increasing the activator content， the Shore hardness and crosslinking density of recycled rubber continue to decrease， while the tensile strength， elongation at break and gel content first increase and then decrease. When the activator content is 0.9 phr， the tensile strength and the maximum elongation at break reach the maximal and the maximum gel content of the recycled rubber is 19.7%. The microscopic morphology shows that the particles of the rubber powder of the waste tire tread are relatively dispersed. The structural particles of the recycled rubber are adhered to each other， and there are many holes and defects. The Mooney viscosity decreases with increasingof the activator content. On the whole， the optimum content of activator 420 is 0.9 phr， and the properties of recycled rubber are the best.

Key words: Reclaimed rubber, Waste tires, Mechanochemical regeneration, Gel content, Crosslink density, Mooney viscosity

CLC Number:

O655

Jing YAO, Ming-Ming DAI. Preparation and Properties of Reclaimed Rubber Based on Passenger Car Tire Tread Powder[J]. Chinese Journal of Applied Chemistry, 2023, 40(1): 52-58.

Figures/Tables 8

Fig.1 Chemical structure of activator 420［18］

Fig.2 FT-IR spectra of waste rubber powder and reclaimed rubber （GTR represents waste rubber powder，and RR-0.3， RR-0.6， RR-0.9， RR-1.2 represent the reclaimed rubber with activator content of 0.3， 0.6， 0.9 and 1.2 phr， respectively）

Fig.3 SEM images of rubber powders and reclaimed rubbers

Fig.4 Shore hardness of reclaimed rubbers

Fig.5 Curves of tensile strength and elongation at break of reclaimed rubbers

Fig.6 Gel content and crosslink density curve of reclaimed rubbers

Table 1 Performance test of reclaimed rubbers

Content/phr	Hardness/Shore A	Tensile strength/ MPa	Elongation at break/%	Sol content/%	Crosslink density/10^-4	Mooney viscosity/ML（1+4）100 ℃
0.3	72	7.55	292.6	16.5	1.21	118.6
0.6	69	7.93	298.9	18.1	1.03	111.3
0.9	65	8.55	305.2	19.7	0.89	105.7
1.2	63	7.93	300.3	19.2	0.83	98.2

Fig.7 Mooney viscosity curve of reclaimed rubbers

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Preparation and Properties of Reclaimed Rubber Based on Passenger Car Tire Tread Powder

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