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Constant viscosity natural rubber and preparation method thereof

A technology of natural rubber and rubber particles, applied in the field of constant viscosity natural rubber and its preparation, can solve the problems of unstable quality of natural rubber, lower Mooney viscosity, poor stability, etc., and achieve good market promotion value, stable Mooney viscosity, Stable quality effect

Inactive Publication Date: 2019-01-01
XISHUANGBANNA SINOCHEM RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the Mooney viscosity of natural rubber, on the one hand, mastication can be carried out, but this undoubtedly increases the energy consumption of production; The disadvantage of poor stability, the quality of the modified natural rubber is not stable

Method used

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  • Constant viscosity natural rubber and preparation method thereof
  • Constant viscosity natural rubber and preparation method thereof
  • Constant viscosity natural rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] see figure 1 , the preparation method of constant sticky natural rubber, comprises the following steps:

[0026] A. Impurity removal procedure: put the raw crepe pieces into a large pool equipped with a fishing net for immersion. The function of the large pool is mainly to soak and screen, so that the raw crepe pieces containing a lot of sediment and other impurities will not sink into the production line, and can It can effectively separate the sediment on the surface of the film and sink it to the bottom to achieve the purpose of removing impurities. Then, the raw crepe pieces are crushed and made into small pieces by a crusher, and the smaller crepe pieces enter the first-stage floating washing round tank for floating washing. washing action. The rubber blocks washed for the first time are lifted and dripped by the bucket elevator and transported to the double-roller machine for crushing and crushing, and then crushed into the secondary floating washing round tank,...

Embodiment 2

[0033] The preparation method of Hengxian natural rubber: cup glue and micelles can be used to replace the raw crepe sheets. Other processing techniques are the same, but the impurity content and ash content are higher than those of Example 1. At the same time, the domestic supply of this raw material is small, and it is difficult to produce on a large scale.

Embodiment 3

[0035] The preparation method of constant viscosity natural rubber is prepared with latex, but the tensile strength is lower than that of Examples 1 and 2, and specifically comprises the following steps:

[0036] A. Purification: make the fresh latex pass through the secondary screen with apertures of 40 meshes and 60 meshes in turn, remove impurities such as sediment, and measure the dry rubber content of the fresh latex to be 35%.

[0037] B. Constant viscosity treatment: add 5% hydroxylamine sulfate solution and 10% hydrazine hydrate solution to the fresh latex after removal of impurities, mix and stir for 25 minutes.

[0038] C. Coagulation and aging: using acid coagulation method, dilute the treated latex with water to a concentration of 24%, and then cooperate with formic acid in a volume ratio of 600:1 to flow down the tank until the latex solidifies, shrinks and dehydrates, and the solidification needs to control the latex The pH value is 4.3 to 4.6.

[0039] D. Dehyd...

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PUM

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Abstract

The invention discloses a constant viscosity natural rubber and a preparation method thereof, which relate to the technical field of natural rubber processing. The Mooney viscosity of the rubber is 55.00-65.00, the plasticity retention percentage is greater than or equal to 60, the tensile strength is greater than or equal to 17 MPa, and the elongation at break is greater than or equal to 700%; the preparation method includes an impurity removal process, a granulation treatment process, constant viscosity treatment, and a drying process; the preparation method can effectively inhibit a cross-linking bridging reaction between active groups on a molecular chain during rubber storage, the Mooney viscosity of the rubber is stable, the consistency is good, the physical and mechanical propertiesare excellent, and the processing characteristics are good. A hydroxylamine sulfate solution has the advantages of wide source of raw materials, simple synthesis method, convenient use, and low cost.The preparation method has strong applicability, and can be carried out all year round. The produced constant viscosity natural rubber has excellent performance and stable quality, is beneficial to reducing the defective rate of products, improves the economic benefits of enterprises, simplifies the processing of a downstream rubber product company, and improves the automation level of rubber production.

Description

technical field [0001] The invention relates to the technical field of natural rubber processing, in particular to a constant viscosity natural rubber with stable Mooney viscosity, good sizing consistency and excellent performance and a preparation method thereof. Background technique [0002] Due to the presence of active groups such as aldehyde groups on the molecular chain of natural rubber, cross-linking and bridging within and between molecular chains is prone to occur during storage, forming a macromolecular network structure, resulting in an increase in the Mooney viscosity of natural rubber. to gel. Due to the cross-linking reaction between the active groups on the molecular chain, the physical, mechanical and processing properties of natural rubber also change, such as poor consistency, reduced viscoelasticity, and reduced aging resistance. Secondary processing and utilization have a great impact. In order to reduce the Mooney viscosity of natural rubber, on the o...

Claims

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Application Information

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IPC IPC(8): B29B9/06B29B13/06C08C1/02C08C1/15
CPCB29B9/065B29B13/065C08C1/02C08C1/15
Inventor 刀剑华杨杰胡昌法彭兰英杨学富李双全唐淑义
Owner XISHUANGBANNA SINOCHEM RUBBER