Preparation method of silicon carbon black / natural rubber composite material

A composite material and natural rubber technology, applied in the field of composite materials, can solve the problems of strong surface adsorption, increased hysteresis loss of vulcanizate, damaged dynamic performance, etc., to achieve excellent mechanical properties, reduce production costs, and simplify production processes. Effect

Active Publication Date: 2017-11-10
JILIN UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of silica particles contains a large number of hydroxyl groups, showing strong polarity, incompatible with non-polar rubber, and difficult to disperse evenly
[0007] 1. The surface modification of silica is usually to mask the hydroxyl groups on the surface of silica simply by chemical methods. The hydroxyl groups on the surface of silica cannot be completely eliminated, which will still lead to the existence of the phase interface between rubber and silica, resulting in the existence of quality rubber products. Hidden danger;
[0008] 2. The cost of surface-modified silica is high. For example, after Si69 is used to modify the surface of silica, the compatibility between silica and rubber can be improved, and the strength of rubber can be increased, but the cost per ton of silica a large increase;
[0010] In addition, in the prior art, when the rubber compound is directly prepared by the mechanical mixing method, the particle size of carbon black and silicon dioxide has reached the nanometer level, the surface adsorption is strong, and the aggregation tendency is large, and it is difficult to form after mixing into rubber. Nanodispersion, which increases the hysteresis loss of the vulcanizate and impairs its dynamic properties

Method used

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  • Preparation method of silicon carbon black / natural rubber composite material
  • Preparation method of silicon carbon black / natural rubber composite material
  • Preparation method of silicon carbon black / natural rubber composite material

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Experimental program
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preparation example Construction

[0039] The preparation method of silicon carbon black / natural rubber composite material of the present invention, step is as follows:

[0040] Step 1. Rice husk pyrolysis

[0041] Put the purified rice husk into the pyrolysis tower, keep the temperature of the pyrolysis section at 600-700°C by adjusting the oxygen content entering the pyrolysis zone, pyrolyze the rice husk for 0.5-2.0h, preferably 650°C, and pyrolyze for 1.5 h, to obtain pyrolysis gas and pyrolysis charcoal;

[0042] Among them, there are no special restrictions on rice husks, and rice husks with higher silica content are generally selected; the purification of rice husks is mainly to remove dust, sieve broken rice and powder;

[0043] Step 2. Decoking in situ

[0044] The pyrolysis gas and pyrolysis charcoal obtained in step 1 continue down the pyrolysis tower, keep a constant temperature of 600-700°C, remove tar for 0.5-1.0h, and the tar-free pyrolysis gas and tar-free pyrolysis charcoal enter the pyrolysi...

Embodiment 1

[0062] Step 1. Put the purified rice husk into the pyrolysis tower, keep the temperature at 650° C., and perform pyrolysis for 1.5 hours to obtain pyrolysis gas and pyrolytic charcoal. The volatile content in the pyrolytic charcoal is 5.4 wt %;

[0063] Step 2. The pyrolysis gas and pyrolysis carbon obtained in step 1 continue to descend along the pyrolysis tower, maintain a constant temperature of 650°C, remove tar for 0.5h, and enter the pyrolysis tower for water cooling to cool down. section, cooled to 300°C, separated by a cyclone separator, and the separated tar-free pyrolysis gas was introduced into the boiler for combustion and heating, and the volatile content of the separated tar-free pyrolysis carbon was 1.2wt%;

[0064] Step 3: Put the separated tar-free pyrolytic carbon into the jet mill for crushing, and control the speed of the classifier to 4500 rpm, so that the pyrolytic carbon with an average particle size of less than 10 μm escapes with the air flow, and the p...

Embodiment 2

[0069] Steps one, two, three, four are the same as in Example 1

[0070] Step 5. Add the raw rubber to the internal mixer. Under the condition of the temperature of the internal mixer at 140°C and the rotation speed at 50rpm, after masticating for 5 minutes, according to the mass ratio of raw rubber and silicon carbon black powder at 1:0.1, add Silicon carbon black powder, continue to mix 15min, deglue, obtain silicon carbon black / natural rubber composite material;

[0071] Among them, the raw rubber is composed of 50 parts by weight of NR, 20 parts by weight of SBR and 30 parts by weight of BR. Based on 100 parts by weight of raw rubber, the additives are 1.5 parts by weight of stearic acid, 3.5 parts by weight of zinc oxide, and 40202.0 parts by weight of anti-aging agent , 1.0 parts by weight of antioxidant RD, 8.0 parts by weight of aromatic oil, 1.0 parts by weight of microcrystalline wax, 1.3 parts by weight of accelerator NS and 1.4 parts by weight of sulfur.

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Abstract

The invention discloses a preparation method of a silicon carbon black / natural rubber composite material, belongs to the technical field of composite materials, and solves the problems of high cost, non renewable resources, complex process, difficult processing and uneven dispersion of use of surface modified silica for filling natural rubber in the prior art. According to the method, first purified rice husks are added into a reaction device for pyrolysis to obtain pyrolysis gas and pyrolytic carbon, and after decoking, cooling and separation, tar-free pyrolysis gas and tar-free pyrolytic carbon are obtained; then tar-free pyrolytic carbon gas flow is pulverized, and ball-milled to the average particle size within 10 mu m to obtain silicon carbon black powder, and the silicon carbon black powder is further processed to obtain the modified silicon carbon black powder and silicon carbon black masterbatch; and finally the silicon carbon black / natural rubber composite material can be obtained by mixing and kneading technology. The preparation method has the advantages of low cost, saving energy, environmental-friendliness, full use of renewable resources, and broad application prospects in the rubber field.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a method for preparing a silicon carbon black / natural rubber composite material. Background technique [0002] Natural rubber is a kind of natural polymer compound, which refers to the elastic solid made of natural latex collected from rubber trees and processed through coagulation and drying. The main component of natural rubber is rubber hydrocarbon (cis-1,4-polyisoprene), with a content of 91%-94%, and the rest are non-rubber substances such as protein, fatty acid, ash, and sugar. [0003] Natural rubber has excellent resilience, insulation, water resistance and plasticity, but poor aging resistance, oil resistance, chemical resistance, temperature resistance, and frost resistance. Therefore, the addition of filler additives can achieve oil resistance and acid resistance. , alkali resistance, heat resistance, cold resistance, pressure resistance, wear ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/02C08L9/06C08L9/00C08L91/00C08L91/06C08K13/06C08K9/10C08K3/36C08K3/22C08K3/06
Inventor 王晓峰金璐周玉朱燕超杨晓敏王子忱
Owner JILIN UNIV
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