Processing and Properties of Rubber Modified by Coated Heavy Calcium Powder as the Filler

doi:10.11944/j.issn.1000-0518.2019.07.180326

Chinese Journal of Applied Chemistry ›› 2019, Vol. 36 ›› Issue (7): 790-797.DOI: 10.11944/j.issn.1000-0518.2019.07.180326

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Processing and Properties of Rubber Modified by Coated Heavy Calcium Powder as the Filler

FAN Tianbo^a,CHEN Si^a,JIANG Yu^a,CAI Xun^b,KANG Ping^c,LI Li^d,ZHANG Li^e,LIU Yunyi^a^*()

^aLiaoning Provincial Key Laboratory of Chemical Application Technology,College of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China
^bZhonghua Quanzhou Petrochemical Company Limited,Quan zhou,Fujian 362103,China
^cCollege of Materials Science and Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China
^dCollege of Computer Science and Technology,Shenyang University of Chemical Technology,Shenyang 110142,China
^eShenyang Research Institute of Chemical Industry,Shenyang 110021,China

Received:2018-10-11 Accepted:2019-03-22 Published:2019-07-01 Online:2019-07-02
Contact: LIU Yunyi
Supported by:
Supported by the National Natural Science Foundation of China(No.61102041), the Liaoning Provincial Innovation Team Support Program(No.2013010), the National Science and Technology Support Program(No.2013BAB09B01), the Liaoning Provincial Department of Education Project(No.L2013169), the Liaoning Provincial Fine Chemicals Collaborative Innovation Center Project, and the Liaoning Province Natural Fund(No.201602582)

Abstract

Abstract:

Heavy calcium powder is widely used as a filler in rubber processing, but the interface with the rubber material is poorly combined due to high polarity and poor dispersibility of powders, which affects the mechanical properties such as tensile strength and elongation at break of the rubber product. In this paper, the precipitation method is used to form calcium carbonate which is directly crystallized on the surface of heavy calcium powder particles in CaCl₂-H₂O-NH₃-CO₂ system. If n(CaCl₂)：n(heavy calcium powder)=1：100, 5：100, 10：100 coated calcium powder are filled into natural rubber and recycled rubber, the mechanical properties of rubber are some what improved compared to rubber filled with uncoated calcium powder. The filling amount is 8.5% and 15%, in the mechanical properties such as hardness and modulus, the coated calcium powder rubber product is obviously superior to the light calcium powder rubber product; when it comes to 5% or 8.5%, the tensile strength and elongation at break of the coated heavy calcium rubber product are close to that of silica, and the hardness is higher than rubber products filled with silica.

Key words: heavy calcium powder, coating, light calcium powder, rubber, mechanical properties

FAN Tianbo,CHEN Si,JIANG Yu,CAI Xun,KANG Ping,LI Li,ZHANG Li,LIU Yunyi. Processing and Properties of Rubber Modified by Coated Heavy Calcium Powder as the Filler[J]. Chinese Journal of Applied Chemistry, 2019, 36(7): 790-797.

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Processing and Properties of Rubber Modified by Coated Heavy Calcium Powder as the Filler

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