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Method for efficiently preparing natural rubber

A natural rubber, high-efficiency technology, applied in the field of high-efficiency preparation of natural rubber, can solve the problems of increasing the number of medium relative molecular weight fractions, affecting production, poor performance and stability of mixed rubber and products, etc. The number of times, the effect of improving the efficiency of plasticizing

Inactive Publication Date: 2018-05-29
SHENYANG SAIYA RUBBER PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, during the processing of NR, the quality of the plasticized rubber has a great influence on the mixing and subsequent processing, resulting in poor performance stability of the mixed rubber and products, which affects production.
[0003] The open mill has four methods such as wrapping roll method, thin pass method, subsection plasticizing method and chemical plasticizing method. Among them, when the open mill thin pass method is plasticized, the long molecular chain is first broken, resulting in a change in the relative molecular mass distribution. Narrow, the number of medium relative molecular weight fractions increases, and the small molecular fractions do not change much. Therefore, the masticated rubber masticated by the thin-pass method has high and uniform plasticity and good quality, but the efficiency is low. Therefore, it is necessary to develop a high-efficiency preparation The natural rubber approach is very necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing natural rubber, the steps are as follows:

[0022] (1) Plasticizing

[0023] Weigh 30g of zinc oxide and 50g of stearic acid, put them into a kneader for kneading, the kneading speed is 50-80r / min, the kneading time is 3-5min, and prepare the mixture for later use; Weigh the natural rubber and put it into kneading In the machine, break the glue for 2-5 times, place it for 1-2d, then add zinc oxide and stearic acid mixture for mastication, the roller temperature is 50-65℃, the roller distance is 0.3-0.8mm, and the thin pass is 8-10mm. Second, the plasticized rubber is obtained;

[0024] (2) Mixing

[0025] Put the plasticized rubber in step (1) into the mixer for mixing, the rotor speed is 90-110r / min, and the time is 10-40min, then put it into the open mixer for mixing, the mixing speed 150-200r / min, the mixing time is 10-30min, and the debinding temperature of the mixed material after mixing is 60-80°C to obtain the mixed rubber;

[0026] (3)...

Embodiment 2

[0029] A method for preparing natural rubber, the steps are as follows:

[0030] (1) Plasticizing

[0031] Weigh 30g of zinc oxide and 50g of stearic acid, put them into a kneader for kneading, the kneading speed is 50-80r / min, the kneading time is 3-5min, and prepare the mixture for later use; Weigh the natural rubber and put it into kneading In the mill, break the rubber for 2-5 times, place it for 1-2 days, then add zinc oxide and stearic acid mixture for plasticizing, the roller temperature of the open mill is 60°C, the roller distance is 0.5mm, thin pass 8-10 times , to prepare plastic rubber;

[0032] (2) Mixing

[0033] Put the plasticized rubber, anti-aging agent and vulcanizing agent in step (1) into the mixer for mixing, the rotor speed is 90-110r / min, the time is 10-40min, and then put it into the open mixer for mixing Mixing, the mixing speed is 150-200r / min, the mixing time is 10-30min, and the temperature of the mixed material after mixing is 60-80°C to obtain...

Embodiment 3

[0037] A method for preparing natural rubber, the steps are as follows:

[0038] (1) Plasticizing

[0039] Weigh 30g of zinc oxide and 50g of stearic acid, put them into a mixer and knead them, the kneading speed is 50-80r / min, and the kneading time is 3-5min to prepare the mixture for later use; Weigh the natural rubber and put it into kneading In the mill, break the rubber for 2-5 times, place it for 1-2 days, then add zinc oxide and stearic acid mixture for plasticizing, the roller temperature of the open mill is 60°C, the roller distance is 0.5mm, thin pass 8-10 times , to prepare plastic rubber;

[0040] (2) Mixing

[0041] Put the plasticized rubber, accelerator, coupling agent and vulcanizing agent in step (1) into the mixer for mixing, the rotor speed is 90-110r / min, the time is 10-40min, and then put it into the open Mixing is carried out in the mixer, the mixing speed is 150-200r / min, the mixing time is 10-30min, and the temperature of the mixed material after mix...

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PUM

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Abstract

The invention belongs to the technical field of rubber materials and relates to a method for efficiently preparing natural rubber. The steps of the method for preparing the natural rubber are as follows: (1) plastication, to be more specific, weighing natural rubber, putting the natural rubber into an open mixing machine for rubber crushing for 2 to 5 times, placing for 1 to 2 days, adding a zincoxide and stearic acid mixture for plastication, and performing thin-passing for 8-10 times at roller temperature of 50-65DEG C and under a roller gap of 0.3-0.8mm to obtain plasticated rubber; (2) mixing, to be more specific, filling the plasticated rubber obtained in the step (1) into a mixing machine for mixing for 10-40min under the rotor speed of 90-110r / min, then filling the plasticated rubber into the open mixing machine for mixing for mixing time of 10-30min under the mixing speed of 150-200r / min, and preparing rubber compound from the mixed material at rubber discharging temperature of 60-80DEG C; and (3) vulcanizing, to be more specific, placing the compound rubber on a vulcanizing machine for vulcanizing at vulcanizing temperature of 170-190DEG C for vulcanizing time of 5 to 10minutes to obtain the finished product. According to the preparation method, the zinc oxide and stearic acid mixture is added to the natural rubber to reduce times of thin passing, the preparation efficiency is improved, and operation is simple.

Description

technical field [0001] The invention belongs to the technical field of rubber materials and relates to a method for preparing natural rubber with high efficiency. Background technique [0002] At present, one of the most widely used rubbers is natural rubber (NR), which has excellent comprehensive performance and process performance. Due to the high initial Mooney viscosity and high elasticity of NR, it cannot be mixed directly. It needs to be masticated first to reduce the viscosity and elasticity and improve the plasticity. Therefore, the quality of plasticized rubber during the processing of NR has a great influence on the mixing and subsequent processing, resulting in poor performance stability of the mixed rubber and products, which affects production. [0003] The open mill has four methods such as wrapping roll method, thin pass method, segmental plasticizing method and chemical plasticizing method. Among them, when the open mill thin pass method is plasticized, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08K13/02C08K3/22C08K5/09B29B7/00B29C35/02
CPCC08K13/02B29B7/002B29C35/02C08K3/22C08K5/09C08K2003/2296C08L7/00
Inventor 刘梦菲
Owner SHENYANG SAIYA RUBBER PRODS