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Nitrile butadiene rubber latex coagulation technology

A nitrile-butadiene rubber and process technology, which is applied in the field of coagulation process of nitrile-butadiene rubber latex, can solve the problems of increased production cost, fine particles of nitrile-butadiene rubber latex, large loss of broken rubber, etc., and achieves the effect of reducing production cost

Active Publication Date: 2014-04-16
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1. During the post-coagulation treatment process, the nitrile rubber emulsion has fine particles and a large amount of crushed rubber loss.
[0008] 2. The amount of coagulant used is large, the method of use is cumbersome, and the coagulation time is long, resulting in increased production costs
[0009] 3. The COD value in the discharged wastewater is high

Method used

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  • Nitrile butadiene rubber latex coagulation technology
  • Nitrile butadiene rubber latex coagulation technology
  • Nitrile butadiene rubber latex coagulation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Coagulate the nitrile rubber latex according to the following process steps:

[0042] ① Preparation of coagulation mother liquor

[0043] Accurately weigh 250 grams of sodium chloride, dissolve it in 20 parts by weight of desalted, deoxygenated water, and make it into a condensed mother liquor for subsequent use;

[0044] ② Preparation of coagulant solution

[0045] Dilute commercially available polyepichlorohydrin dimethylamine with desalted and deoxygenated water to a coagulant solution with a solid content of 10%, and set aside;

[0046] ③Nitrile rubber latex preheating

[0047] 500 grams of industrial nitrile rubber latex with a solid content of 20% equivalent to 100 grams of dry glue, preheated at 52 ° C. Standby;

[0048] ④Preparation of pH adjustment solution

[0049] Preparation weight percentage concentration is the sulfuric acid solution of 20%, standby;

[0050] ⑤ Coagulation of latex

[0051] Add the coagulation mother liquor prepared in step ① into th...

Embodiment 2～ Embodiment 6

[0058] According to the method and step of embodiment 1, acrylonitrile-butadiene rubber latex is carried out coagulation treatment, and the technical index that raw material proportioning and coagulation treatment process reaches is listed in table 1,

[0059] Table 1

[0060]

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Abstract

The invention relates to a nitrile butadiene rubber latex coagulation technology, and belongs to the treatment of a rubber latex characterized by a used coagulation agent. The technology is characterized in that polyepichlorohydrin dimethylamine is adopted as a coagulation agent, an aqueous solution of sodium chloride is adopted as a coagulation mother liquor, and sulfuric acid is adopted as a pH adjusting agent, and the technology comprises the following steps: 1, preparing the coagulation mother liquor, 2, preparing a solution of the coagulation agent, 3, preheating a nitrile butadiene rubber latex, 4, preparing a pH adjusting solution, and 5, coagulating the latex. The nitrile butadiene rubber latex coagulation technology has the advantages of coarse colloidal particles in the coagulation process, small crushed colloid loss, less consumption of the coagulation agent, small consumption of the pH adjusting agent, low COD index in discharged wastewater, simple use, short coagulation time and low production cost. The COD content in wastewater is 266.48mg / L, and accounts of 40% of the COD content in the prior art.

Description

technical field [0001] The invention relates to a coagulation process of nitrile rubber latex. Belongs to the treatment of rubber latex characterized by the coagulant used. Background technique [0002] Nitrile rubber (NBR) is obtained by emulsion polymerization of two monomers, butadiene and acrylonitrile. Because its molecular chain contains unsaturated double bonds and polar groups -CN, it has good oil resistance and physical With excellent mechanical properties, it has been widely used in various oil-resistant rubber products, and has broad prospects for development and utilization. [0003] In the production process of nitrile rubber, after the emulsion polymerization is completed, the unreacted raw materials are removed by degassing, and then enter the coagulation unit, and a coagulant is added in the coagulation kettle for coagulation, and then, it is washed with alkali, dehydrated and dried to obtain butyl rubber. Sunny rubber products. [0004] In the post-coagul...

Claims

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Application Information

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IPC IPC(8): C08C1/15
Inventor 王晓敏李迎丛悦鑫宋培军赵国训车志强
Owner CHINA PETROLEUM & CHEM CORP
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