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Concentrated natural latex flocculation method

A technology of natural rubber latex and natural rubber, which is applied in the field of natural rubber, can solve problems such as the deterioration of rubber properties, and achieve the effects of small impact, convenient operation, and increased flocculation speed

Inactive Publication Date: 2019-03-19
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the wet mixing process in the prior art, develop and design a concentrated natural rubber latex flocculation method, and avoid the problem of deterioration of rubber performance by adding acid components to flocculate the mixed rubber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The process of the concentrated natural rubber latex flocculation method involved in this embodiment is as follows: first, 1 volume part of 50 phr solid content mass fraction of 60% concentrated natural rubber latex is slowly added to 3 volume parts of seawater-like flocculants, and the concentrated natural rubber latex is added At the same time, stir the seawater-like flocculant at a speed of 10-300r / min. After the concentrated natural latex is added, continue to stir for 20-40min, and place the concentrated natural latex and seawater-like flocculant at a temperature of 40-60°C to react for 1 -3 hours, then, cool naturally to 15-35°C to get the gel block; then, use 300ml deionized water to wash the gel block; finally, put the gel block in an open mill and a dryer in turn for drying Dehydration and drying to obtain natural rubber.

[0013] The seawater-like flocculant involved in this embodiment includes the following components in parts by weight: 15 parts of sodium ch...

Embodiment 2

[0015] This embodiment relates to the comprehensive performance test of vulcanized rubber materials. First, natural rubber is prepared by conventional acid flocculation method and embodiment 1 flocculation method, and then 100phr of natural rubber (calculated as dry rubber 100g), 5phr of zinc oxide, and 2phr of zinc oxide are used. Stearic acid, 0.7phr of NS / TBBS and 30phr of N330 carbon black are used to prepare the masterbatch, and finally put the masterbatch into the open mill to adjust the rolling distance and cover the rolls, then add zinc oxide and stearin in sequence according to the set quality Acid, NS, and N330 carbon black were packed into triangular bags 6 times, pressed into a set thickness, and after 8 hours of parking, the experimental samples were obtained, and 30g of the experimental samples were vulcanized by a flat vulcanizer, and the vulcanized experimental samples were mechanically vulcanized. The performance test results are as follows:

[0016] ...

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Abstract

The invention belongs to the technical field of production of natural rubber, and relates to a concentrated natural latex flocculation method. The concentrated natural latex flocculation method comprises the following steps: firstly, slowly adding concentrated natural latex in a seawater-like flocculating agent under the condition of stirring, after addition of the concentrated natural latex is completed, keeping stirring for 20-40 min, reacting the concentrated natural latex and the seawater-like flocculating agent under set conditions, and then naturally cooling to the temperature of 15-35 DEG C to obtain gel blocks; secondly, cleaning the gel blocks by using 300 ml of deionized water; and finally, successively placing the gel blocks in an open mill and a drying machine for dewatering and drying separately to obtain natural rubber. The concentrated natural latex flocculation method has the advantages that firstly, the seawater-like flocculating agent is low in price, and is environmentally friendly, secondly, the requirements for equipment are low, the equipment are conventional equipment, reaction conditions are mild, the equipment are not corroded, thirdly, in the technologicalprocess, irritating odor is avoided, influences to operators are small, and the method is environmentally friendly, and fourthly, influences of factors such as weather, the quality of the concentrated natural latex and latex stopping period to continuous production of the natural rubber are overcome.

Description

Technical field: [0001] The invention belongs to the technical field of natural rubber production, and relates to a method for flocculating concentrated natural rubber latex. The concentrated natural rubber latex is quickly flocculated by using a seawater-like flocculant to prepare natural rubber with superior performance. Background technique: [0002] In recent years, the global output of concentrated natural rubber latex has reached more than 1 million tons per year. Using concentrated natural latex to manufacture rubber products has the advantages of simple production process, no need for heavy equipment and organic solvents, low power consumption, good working conditions, and certain products. In addition to the advantages of high performance, it is also easier to realize mechanization and automation. All products made of latex use concentrated natural latex instead of raw natural rubber. Natural rubber (NR) is a natural polymer compound with cis-1,4-polyisoprene as th...

Claims

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Application Information

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IPC IPC(8): C08C1/15
CPCC08C1/15
Inventor 汪传生谢苗刘庄宇
Owner QINGDAO UNIV OF SCI & TECH
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