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Natural rubber mastication method

A technology of natural rubber and rubber breaking, applied in the field of plasticizing of natural rubber, can solve the problems of poor dispersion coefficient of carbon black, uneven plasticizing of natural rubber, easy slippage, etc. The effect of plasticizing uniformity

Inactive Publication Date: 2018-11-13
浙江环能传动科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, this kind of internal mixer is easy to slip during mastication, and the natural rubber after mastication will have uneven mastication. After using this kind of natural rubber for subsequent mixing, it is also easy to cause poor dispersion coefficient of carbon black.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) 140Kg of natural rubber and 10Kg of carbon black are dropped in the banbury mixer, carry out mastication, and described mastication pressure is 12Mpa, and mastication time is 320s;

[0025] (2) Take the natural rubber masticated in step (1), pass it through the isolation pool where the release agent is stored, then air-dry and collect the film, and park it for 5 hours to obtain the masticated natural rubber. Five plasticity tests were carried out, and the measured plasticity was 0.28-0.31.

[0026] (3) Put the plasticized natural rubber and synthetic rubber in step (2) into a 190L falling internal mixer, add suitable additives and continue mixing, the mixing pressure is 12Mpa, and the mixing time is 320s to obtain the mixing Glue, the measured dispersion coefficient of carbon black is 6.

Embodiment 2

[0028] (1) 140Kg of natural rubber and 15Kg of carbon black are dropped in the internal mixer, carry out mastication, and described mastication pressure is 12Mpa, and mastication time is 280s;

[0029] (2) Take the masticated natural rubber in step (1), pass it through the isolation pool where the release agent is stored, then air-dry and collect the film, and park it for 12 hours to obtain the masticated natural rubber. Five plasticity tests were carried out, and the measured plasticity was all 0.30.

[0030] (3) Put the plasticized natural rubber and synthetic rubber in step (2) into a 190L falling internal mixer, add suitable additives and continue mixing, the mixing pressure is 12Mpa, and the mixing time is 320s to obtain the mixing Glue, the measured dispersion coefficient of carbon black is 6.

Embodiment 3

[0032] (1) 140Kg of natural rubber and 20Kg of carbon black are dropped in the banbury mixer, carry out mastication, and described mastication pressure is 12Mpa, and mastication time is 240s;

[0033] (2) Take the masticated natural rubber in step (1), pass it through the isolation pool where the release agent is stored, then air-dry and collect the film, and park it for 36 hours to obtain the masticated natural rubber. Five plasticity tests were carried out, and the measured plasticity was 0.29-0.32.

[0034] (3) Put the plasticized natural rubber and synthetic rubber in step (2) into a 190L falling internal mixer, add suitable additives and continue mixing, the mixing pressure is 12Mpa, and the mixing time is 320s to obtain the mixing Glue, the measured dispersion coefficient of carbon black is 6.

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PUM

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Abstract

The invention belongs to the technical field of rubber preparation, and relates to a natural rubber mastication method, comprising the following steps: (1) putting 140 parts of natural rubber and 10-20 parts of carbon black into an internal mixer for mastication under the mastication pressure of 12Mpa for 240-320 seconds; and (2) making the natural rubber masticated in the step (1) pass through anisolation pool, then air-drying and collecting, and standing for 5 to 36 hours to obtain masticated natural rubber. The natural rubber mastication method provided by the invention has the advantagesof shortening the time of mastication in the internal mixer and saving a lot of energy, solving the problem of slippage in the mastication process, and enabling the masticated natural rubber to have better mastication uniformity and further have a better carbon black dispersion coefficient after subsequent mixing.

Description

technical field [0001] The invention belongs to the technical field of rubber preparation, and relates to a mastication method of natural rubber. Background technique [0002] Mastication refers to a process of rubber processing, which refers to the use of mechanical or chemical methods to reduce the molecular weight and viscosity of raw rubber to improve its plasticity and obtain appropriate fluidity to meet the needs of further processing of mixing and molding. The plasticating process is a process in which the rubber macromolecular chain is broken, and the molecular chain is changed from long to short to make the molecular weight distribution uniform. There are two main factors that lead to the breakage of macromolecular chains in the plasticizing process: one is mechanical destruction; the other is thermal oxidative degradation. During low-temperature mastication, it is mainly due to mechanical destruction, and macromolecules undergo chain scission under the action of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08K3/04B29B7/00
CPCB29B7/002C08K3/04C08L7/00B29B7/183B29B7/7495B29B7/90
Inventor 许小虎王启超王如兴
Owner 浙江环能传动科技有限公司
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