Solidifying device and method of natural latex

A technology of natural latex and generating device, applied in the field of natural rubber rubber production, can solve the problems of strong irritating odor, strong acid corrosion, incapable of industrial application, etc., and achieve the effect of keeping the components unchanged and avoiding pollution

Inactive Publication Date: 2019-03-26
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

The physical method refers to the method of using heat source, cold source or mechanical force to destroy the hydration film on the surface of rubber particles, so that the emulsion system is unstable and coagulated. However, it takes a long time to coagulate, and local coagulation is not sufficient, so it cannot be applied industrially. and other disadvantages; chemical method refers to the method of coagulating natural rubber latex by adding acid, salt, chemical coagulant, etc. Adding acid coagulation is the most widely used coagulation method at present, which has the advantages of fast coagulation time, sufficient coagulation, and easy industrial application. , but the cost of coagulation is high, the acid is corrosive, the irritating smell is strong, a large amount of rubber-making wastewater produced by coagulation pollutes the environment, and the addition of foreign chemical substances has a great impact on the performance of natural rubber; the microbial method refers to the use of natural latex. The method of adding bacteria to make the emulsion coagulate. During the coagulation process of this method, there are serious odor and clot swelling, which reduces the utilization rate of the coagulation tank and the coagulation capacity of the standard rubber processing plant, and is affected by process conditions such as temperature and pH. Value, latex preservative, etc. have a great influence, resulting in difficult control of product quality consistency

Method used

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  • Solidifying device and method of natural latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Get 50g freshly collected Hevea brasiliensis fresh latex, dry rubber content is 25.2%, ammonia preservative content is 0, is placed in the insulating container, with 10 dry cells of 1.5V as DC power supply, graphite electrode 1 is connected DC power supply positive pole , The graphite electrode II is connected to the negative pole of the DC power supply, and the two electrodes are vertically immersed in the fresh latex with a distance of 1 cm, and the DC power is connected. After 35 minutes, the fresh latex solidifies. After solidification, take out the electrodes. After testing, the main components of coagulation wastewater are soluble organic matter, protein, and amino acids.

Embodiment 2

[0045] Take 100g of concentrated latex, the dry glue content is 60%, the ammonia preservative content is 0.6%, put it in an insulating container, add water to adjust the dry glue content to 20% and stir evenly, use the battery as the DC power supply, the voltage is 64V, and the graphite electrode One end of I and graphite electrode II is connected to the same rectangular graphite plate, and the other end is respectively connected to the positive and negative poles of the DC power supply. The rectangular graphite plates are immersed in the latex in parallel with a distance of 2 cm. When the DC power is connected, after about 1 hour, the latex solidifies. After solidification, remove the electrode. After testing, the components of coagulation wastewater are mainly soluble hydrocarbon organic matter, protein, amino acid, and ammoniacal nitrogen.

[0046] Comparative example: Take 100 g of the latex in Example 2, add water to adjust the dry rubber content to 20% and stir evenly, a...

Embodiment 3

[0048] Get 2kg of concentrated latex, the content of dry glue is 60%, the content of ammonia preservative is 0.6%, put it in an insulating container, add water to adjust the content of dry glue to 20%, and use a direct current with a rectifier output voltage of 220V, copper electrode I and copper One end of the electrode II is connected to the same rectangular pure copper plate, and the other end is respectively connected to the positive and negative electrodes of the direct current. The two pure copper plates are vertically immersed in the insulating container and fully contacted with the latex. The distance between the two pure copper plates is 5cm, and the speed is 100r / min. Stir the latex, turn on the DC power supply, and after about 90 minutes, the latex solidifies, and after solidification, take out the electrode.

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Abstract

The invention provides a solidifying device and method of natural latex, and belongs to the field of natural rubber preparation. By arranging electrodes connected with a direct current generating device in an insulating container, the direct current electric field effect needed by natural latex solidification is generated between the electrodes, through the direct current electric field effect, the electric potential balance of protein isoelectric points on the surfaces of rubber particles in the natural latex is broken through, thus protective layers on the surfaces of the rubber particles lose the protecting effect, and the rubber particles are gathered and finally solidified.

Description

technical field [0001] The invention relates to the technical field of natural rubber rubber production, in particular to a coagulation device and method for natural latex. Background technique [0002] Natural latex is a natural high molecular polymer secreted by the rubber-producing plant-Hevea brasiliensis, of which 91% to 94% are rubber hydrocarbons, namely polyisoprene, and the rest are proteins, lipids, inorganic salts, sugars and other non-glue substances. The latex that has just been discharged from the rubber tree, because the pH value is higher than the isoelectric point of the protein, makes the protein that constitutes the surface protective layer of the rubber particles do acid ionization, that is, the surface of the latex particles is negatively charged to form an electric double layer, and then the rubber particles The surrounding water molecules are aligned on the surface of the rubber particles to form a hydration film. The rubber particles in natural late...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C1/14
CPCC08C1/14
Inventor 张福全廖禄生汪月琼王永周许逵林宏图彭政陈美
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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