Preparation method of natural rubber with constant viscosity

A natural rubber and activator technology, applied in the field of natural rubber Mooney viscosity control, to achieve the effects of inhibiting crosslinking reaction, reducing storage hardening tendency, and improving processing characteristics

Inactive Publication Date: 2010-10-20
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, hydroxylamine hydrochloride (including hydroxylamine sulfate, hydrazine hydrate, etc.) is a toxic substance, and many countries have banned its use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add silicon dioxide and sodium bisulfite to 5% sodium dodecylbenzenesulfonate aqueous solution with a mass concentration of 2.5% respectively, and ultrasonically disperse to obtain a silicon dioxide / sodium bisulfite aqueous dispersion The solution is ready for use.

[0025] Take by weighing 400 parts of dry rubber content and be 25% fresh natural latex, add 10 parts of 1% 2-mercaptobenzothiazole 5% (mass concentration) ammonia solution, 1 part of above-mentioned silicon dioxide / sodium bisulfite aqueous solution , stir evenly and stand for 1 hour, add acid to coagulate, dehydrate, rinse, granulate and dry according to the conventional process. The Mooney viscosity of the obtained constant viscosity rubber was 61, the storage hardening value represented by the Wallace plasticity retention ratio was 1.0, and the storage hardening value represented by the Mooney viscosity was 4.3.

Embodiment 2

[0027] Add silica-alumina and sodium bisulfite at a mass concentration of 2.5% respectively to a 5% sodium dodecylbenzenesulfonate aqueous solution, and ultrasonically disperse to obtain a silica-alumina / sodium bisulfite aqueous dispersion solution spare.

[0028] Take by weighing 400 parts of dry rubber content and be 25% fresh natural latex, add 14 parts of 1% 2-thiol benzothiazole 5% (mass concentration) ammonia solution, 1 part of above-mentioned silica alumina / sodium bisulfite aqueous solution , stir evenly and stand for 1 hour, add acid to coagulate, dehydrate, rinse, granulate and dry according to the conventional process. The Mooney viscosity of the obtained constant-viscosity rubber was 60, the storage hardening value represented by the Wallace plasticity retention ratio was 1.2, and the storage hardening value represented by the Mooney viscosity was 4.3.

Embodiment 3

[0030] Montmorillonite and sodium bisulfite are added to 5% sodium dodecylbenzenesulfonate aqueous solution with a mass concentration of 2.5% respectively, and ultrasonically dispersed to obtain a montmorillonite / sodium bisulfite aqueous dispersion The solution is ready for use.

[0031] Take by weighing 400 parts of dry rubber content and be 25% fresh natural latex, add 10 parts of 1% 2-mercaptobenzothiazole 5% (mass concentration) ammonia solution, 1 part of above-mentioned montmorillonite / sodium bisulfite aqueous solution , stir evenly and stand for 1 hour, add acid to coagulate, dehydrate, rinse, granulate and dry according to the conventional process. The Mooney viscosity of the obtained constant viscosity rubber was 64, the storage hardening value represented by the Wallace plasticity retention ratio was 1.2, and the storage hardening value represented by the Mooney viscosity was 4.5.

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Abstract

The invention discloses a preparation method of natural rubber with constant viscosity which relates to the technique of mooney viscosity control of natural rubber. The method comprises the steps of adding the mercaptan compounds into the natural rubber, mixing evenly, and then performing the conventional processes of solidification, tabletting, prilling and drying. The natural rubber with constant viscosity of the invention has the storage hardening value of smaller than 2 represented by the Wallace initial plasticity, and has the storage hardening value of smaller than 5 represented by the mooney viscosity, thereby significantly improving the processing characteristics.

Description

【Technical field】 [0001] The invention relates to a natural rubber Mooney viscosity control technology. 【Background technique】 [0002] Mooney viscosity is an important technical index to measure the average molecular weight and plasticity of natural rubber. The Mooney viscosity of the newly produced natural rubber is about 60-70. With the prolongation of storage time, natural rubber will appear storage hardening, Mooney viscosity will gradually rise to 90-100. [0003] The main reason for the increase of the Mooney viscosity of natural rubber during storage is that the abnormal groups (mainly aldehyde groups) existing in the molecular chain of natural rubber react with proteins or amino acids present in natural rubber to produce cross-linking, and finally gelation occurs. The applicant has studied in detail the variation of the structure and properties of natural rubber during the accelerated storage process. The results show that during the accelerated storage process, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C19/34
Inventor 余和平曾宗强王启方卢光曾霞
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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