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Constant viscosity natural rubber and preparation method thereof

A natural rubber and rubber technology, applied in the field of constant viscosity natural rubber and its preparation, can solve the problems of unstable quality of natural rubber, reduce Mooney viscosity, increase energy consumption, etc., and achieve good market promotion value, stable Mooney viscosity, The effect of reducing the rate of defective products

Active Publication Date: 2014-03-12
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

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preparation example Construction

[0018] The preparation method of the constant-viscosity natural rubber of the present invention comprises purification, constant-viscosity treatment, solidification and aging, dehydration and impurity removal and drying processes, specifically comprising:

[0019] A. Purification: Make the fresh latex pass through the purifier to remove impurities;

[0020] B. Constant viscosity treatment: add ≥2.5% hydroxylamine constant viscosity agent solution and ≥8.0% hydrazine hydrate solution to the fresh latex after impurity removal, and mix and stir for no less than 20 minutes;

[0021] C. Coagulation and aging: using the acid coagulation method, the diluted latex and coagulation acid are mixed and flowed down the tank according to the volume ratio of 576~626:1, until the latex is solidified, shrinkage and dehydration;

[0022] D. Dehydration and impurity removal: The latex clot is thinned by a thinner and dehydrated. After the thin film is floated and washed, it is creped by a crepe ...

Embodiment 1

[0044] ——Preparation of permanent sticky natural rubber

[0045] A, purify: make fresh latex successively be 40 order and 60 order secondary sieves through aperture respectively, remove impurities such as silt, measure the dry glue content of fresh latex to be 35%.

[0046] B. Constant viscosity treatment: add 5% hydroxylamine constant viscosity agent solution and 10% hydrazine hydrate solution to the fresh latex after impurity removal, and mix and stir for 25 minutes.

[0047] C. Coagulation and aging: use acid coagulation method to dilute the treated latex with water to a concentration of 24%, and then flow it into the tank with formic acid at a volume ratio of 600:1 until the latex is solidified, shrinking and dehydrating, and the coagulation needs to control the latex The pH value is 4.3~4.6.

[0048] D. Dehydration and impurity removal: make the latex clot thinner and dehydrated, then soak the thin film in clean water, rinse for 3 minutes, then pass the thin film through...

Embodiment 2

[0051] ——Preparation of permanent sticky natural rubber

[0052] A, purify: make fresh latex successively pass through aperture and be respectively 40 order and 60 order secondary sieves, remove impurities such as silt, measure the dry glue content of fresh latex to be 40%.

[0053] B. Constant viscosity treatment: add 7% hydroxylamine constant viscosity agent solution and 12% hydrazine hydrate solution to the fresh latex after impurity removal, and mix and stir for 30 minutes.

[0054] C. Coagulation and curing: use acid coagulation method, dilute the treated latex with water to a concentration of 23%, and then flow it into the tank with acetic acid at a volume ratio of 576:1 until the latex is solidified, shrinking and dehydrating, and the coagulation needs to control the latex The pH value is 4.3~4.6.

[0055] D. Dehydration and impurity removal: make the latex clot thinner and dehydrated, then soak the thin film in clean water, rinse for 3 minutes, then pass the thin film...

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Abstract

The invention discloses constant viscosity natural rubber and a preparation method thereof, and belongs to the technical field of natural rubber processing. The rubber is 50.00-65.00 in Mooney viscosity, is more than or equal to 60% in plasticity retention percentage, higher than or equal to 14 Mpa in tensile strength, and more than or equal to 700% in elongation at break. The constant viscosity natural rubber is prepared by adding more than or equal to 2.5% of a hydroxylamine constant viscosity solution and more than or equal to 8.0% of a hydrazine hydrate solution in fresh latex. The preparation method of the constant viscosity natural rubber comprises the following processes of purification, constant viscosity treatment, solidification and curing, dehydration and impurity removal, and drying, and comprises the following steps: at first, performing the impurity removal on the fresh latex, adding more than or equal to 2.5% of the hydroxylamine constant viscosity solution and more than or equal to 8.0% of the hydrazine hydrate solution according to the dry rubber amount, and mixing for not less than 20 min; then, mixing the diluted latex with an acid at the volume ratio of (576-626):1 and enabling the mixture to flow and enter into a groove, and drying till the water content is less than or equal to 0.8% after latex coagulum is subjected to thinning, flotation, crumpling, pelleting and spraying. The constant viscosity natural rubber is stable in Mooney viscosity, high in consistency of sizing materials, excellent in performance, simple in production process, strong in interchangeability, and environment-friendly, and has a relatively high popularization value.

Description

technical field [0001] The invention belongs to the technical field of natural rubber processing, and in particular relates to a constant-viscosity natural rubber with stable Mooney viscosity, good rubber consistency and excellent performance and a preparation method thereof. Background technique [0002] Due to the existence of active groups such as aldehyde groups on the molecular chain of natural rubber, cross-linking and bridging between molecular chains and molecular chains are prone to occur during storage, forming a macromolecular network structure, resulting in an increase in the Mooney viscosity of natural rubber. resulting in gelation. Due to the cross-linking reaction between the active groups on the molecular chain, the physical, mechanical and processing properties of natural rubber will 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 ...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08C1/15C08C1/02C08C1/04
Inventor 张风磊刀剑华陈文忠杨学富周兵
Owner XISHUANGBANNA SINOCHEM RUBBER
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