A kind of oxidized constant viscosity agent and its constant viscosity natural rubber product and preparation method

A kind of natural rubber and oxidation technology, applied in the field of preparation of oxidized constant viscosity natural rubber, can solve the problems of constant viscosity natural rubber losing constant viscosity effect, 2-mercaptobenzothiazole is difficult to dissolve, endangering the health of workers, etc. The effect of good constant viscosity, low cost and simple production process

Active Publication Date: 2021-12-03
RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydroxylamine hydrochloride and hydroxylamine sulfate are low-toxic substances, which are harmful to the health of workers. The constant-viscosity natural rubber prepared loses the constant-viscosity effect as the storage time prolongs; the constant-viscosity natural rubber prepared by 2-mercaptobenzothiazole has a good constant-viscosity effect. However, 2-mercaptobenzothiazole is difficult to dissolve, and it is inconvenient to operate in production

Method used

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  • A kind of oxidized constant viscosity agent and its constant viscosity natural rubber product and preparation method
  • A kind of oxidized constant viscosity agent and its constant viscosity natural rubber product and preparation method

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preparation example Construction

[0023] The second aspect of the present invention relates to a preparation method of oxidized constant viscosity natural rubber, the steps of the preparation method are as follows:

[0024] 1) Dissolving the above-mentioned oxidized constant viscosity agent completely in the aqueous solution to prepare a constant viscosity agent solution for subsequent use;

[0025] 2) Take an appropriate amount of fresh latex, add a constant viscosity agent solution during stirring, and after the solution is completely solidified, the curd is matured for 6h-8h, dehydrated, washed, and dried to obtain a constant viscosity natural rubber.

[0026] As an embodiment of the present invention, in the step 1), the mass concentration of the constant viscosity agent solution is 5-20%; more preferably 5-10%; more preferably 10%.

[0027] As an embodiment of the present invention, in the step 2), 100ppm-400ppm of oxidized constant viscosity agent is added to every 1000g of fresh latex.

[0028] As an e...

Embodiment approach

[0029] As an embodiment of the present invention, in the step 2), the stirring speed is 100-200r / min.

[0030] The coagulation method in the present invention can be any method known to those skilled in the art such as acid coagulation, static coagulation or microbial coagulation, and static coagulation is mainly used in the present invention.

[0031] Constant viscosity

[0032] Mooney viscosity is an important index to measure the processing and use performance of natural rubber (NR), because the change of Mooney viscosity of NR during storage has a great impact on its use. NR with constant viscosity is beneficial to simplify the production process of the product, improve the level of automation control, maintain the consistency of product performance, shorten the plasticating time of raw rubber, and reduce energy consumption. Therefore, the production of NR with constant viscosity is welcomed by users. At present, the preparation of constant viscosity NR (CVNR) is usuall...

Embodiment 1

[0043] This embodiment provides a preparation method of oxidized constant viscosity natural rubber, the steps of the preparation method are as follows:

[0044] (1) 4g sodium hypochlorite and 6g hydrogen peroxide mixture are dissolved in aqueous solution, continue to stir until mixture dissolves completely, be mixed with the constant viscosity agent solution that concentration is 10wt%;

[0045] (2) Take 1000g of fresh latex and add 350ppm (calculated by latex weight) constant viscosity agent to solidify, dehydrate, wash, and dry to obtain constant viscosity natural rubber; the stirring speed is 200r / min, and the curd is cured for 6.5h.

[0046] According to the method stipulated in the national standard "GB / T 18013-2008 Determination of Accelerated Storage Hardening Value of Natural Raw Rubber", during the accelerated storage process of the prepared constant-viscosity natural rubber, the initial value of the Wallace plasticity of the raw rubber is stored The hardening value w...

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Abstract

The invention relates to the technical field of primary processing of natural rubber, and discloses a preparation method of oxidized constant-viscosity natural rubber. Dissolve the oxidized constant viscosity agent in water to prepare a certain concentration of constant viscosity agent solution, add the prepared constant viscosity agent solution to the fresh latex, stir while adding, wait for the latex to solidify and mature for a certain period of time before dehydration, washing, Drying made permanent sticky natural rubber. Adding 200ppm to 400ppm constant viscosity agent to 1000g latex, the storage hardening value of the plastic initial value of the prepared natural rubber during accelerated storage is less than 2, and the storage hardening value of the Mooney viscosity is less than 4. The oxidation constant viscosity agent adopted in the method is safe and non-toxic, the preparation process of the constant viscosity natural rubber is simple, the constant viscosity effect is good, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of primary processing of natural rubber, in particular to a preparation method of oxidized constant-viscosity natural rubber. Background technique [0002] Natural rubber gradually hardens during storage, and the Mooney viscosity of raw rubber increases. Product companies need to continuously adjust the production process, which reduces the consistency of the product process, increases the production cost of the product company, and reduces economic benefits. In order to prevent the hardening of natural rubber during storage and improve the quality consistency of natural rubber. In production, constant viscosity agents such as hydroxylamine hydrochloride, hydroxylamine sulfate, and 2-mercaptobenzothiazole are mainly used to prepare constant viscosity natural rubber. Hydroxylamine hydrochloride and hydroxylamine sulfate are low-toxic substances, which are harmful to the health of workers. The constant-viscos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C19/04C08L7/00
CPCC08C19/04C08L7/00
Inventor 李建伟桂红星黄红海戴拓丁丽赵立广宋亚忠王岳坤张小妹
Owner RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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