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A method for controlling volatile fatty acids of natural rubber latex

A volatile fatty acid and natural latex technology, applied in the field of natural rubber processing, can solve the problems of increasing the amount of acid used for latex coagulation, volatile, pungent odor, etc., and achieve the effects of prolonging storage time, improving stability, and reducing sucrose content

Active Publication Date: 2017-10-20
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonia water is widely used as an early preservative for fresh natural latex in production. It can inhibit most bacteria from multiplying and control the volatile fatty acid value of fresh natural latex. However, it is volatile, has a pungent smell, and increases the amount of acid used for latex coagulation, etc. The problem has been difficult to solve
[0006] China invented "a new type of natural latex low-ammonia preservative", application number 201110271824.9 discloses a preservative containing mercaptan benzothiazole and ammonia. After one year of natural storage, the volatile fatty acid value of concentrated natural latex is lower than 0.06, but there are still some remaining, which will be used by microorganisms

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 2 g of calcium oxide in deionized water, fully stir, and prepare a suspension with a mass fraction of 1%, add 80 g of a 1% sodium lauryl sulfate aqueous solution for subsequent use;

[0020] Take 25,000g of fresh natural rubber latex, the total solid content is 31.4%, and its sucrose content is determined to be 10.33mg / mL. Add the pre-configured sodium lauryl sulfate-calcium oxide mixture, stir well and let it stand for 30min to measure its sucrose content. The content is 6.02mg / mL. After centrifugal concentration, its total solid content is determined to be 60.35%, and its volatile fatty acid value is 0.014. After standing for 60 days, its volatile fatty acid value is determined to be 0.016.

Embodiment 2

[0022] Weigh 4g of calcium hydroxide in deionized water, fully stir, and prepare a suspension with a mass fraction of 1%, add 60g of a 1% sodium lauryl sulfate aqueous solution, mix well, and set aside;

[0023] Weigh 25000g of fresh natural rubber latex, the total solid content is 31.4%, and its sucrose content is determined to be 10.33mg / mL, add the pre-configured sodium lauryl sulfate-calcium hydroxide mixture, fully stir and let it stand for 30min, determine Its sucrose content is 4.36 mg / mL. After centrifugal concentration, its total solid content was determined to be 61.15%, and its volatile fatty acid value was 0.014. After standing for 60 days, its volatile fatty acid value was determined to be 0.015.

Embodiment 3

[0025] Weigh 3 g of calcium oxide in deionized water, fully stir, and prepare a suspension with a mass fraction of 1%, add 80 g of a 1% sodium lauryl sulfate aqueous solution for subsequent use;

[0026] Take 50000g of fresh natural rubber latex, the total solid content is 30.4%, and the sucrose content is determined to be 10.58mg / mL. This fresh latex is divided into two parts on average, one part is directly centrifuged, and its total solid content is determined to be 60.12%, and the volatile fatty acid value is 0.017. After standing for 60 days, the volatile fatty acid value increases to 0.026; the other part is added to the pre-configured Sodium lauryl sulfate-calcium oxide mixed solution, after being fully stirred, let it stand for 40 minutes, and its sucrose content was determined to be 5.45 mg / mL. After centrifugal concentration, its total solid content was determined to be 60.03%, and its volatile fatty acid value was 0.015. Days later, its volatile fatty acid value was...

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Abstract

The invention relates to a method for controlling volatile fatty acid of natural latex, and belongs to the technical field of natural rubber processing. The method comprises the steps that 0.3-2.0 parts by wet weight of calcium oxide and 0.2-0.8 part by wet weight of lauryl sodium sulfate or 0.4-3.0 parts by wet weight of calcium hydroxide and 0.2-0.8 part by wet weight of lauryl sodium sulfate are added in 10000 parts by wet weight of fresh natural rubber latex with the total solid content of 20%-40%, and after the mixture is fully stirred to be uniform, standing is performed. According to the method, the content of saccharose in the fresh rubber latex and the content of saccharose in concentrated rubber latex produced through centrifugal concentration can be significantly decreased, the volatile fatty acid value of the natural latex can be effectively controlled at the lower level, the good quality of the rubber latex is kept, and the stability of the concentrated rubber latex is improved.

Description

technical field [0001] The invention relates to a method for controlling volatile fatty acids in natural rubber latex, in particular to a technology for reducing the value of volatile fatty acids by reducing sucrose in natural rubber latex, and belongs to the technical field of natural rubber processing. Background technique [0002] Natural rubber latex is a macromolecular emulsion biosynthesized by Hevea brasiliensis. It has excellent film-forming properties, biocompatibility and wet gel strength, and is an ideal material for latex products. In addition to rubber hydrocarbons and water, fresh latex also contains a small amount of non-rubber substances, such as proteins, lipids, water-soluble substances, acetone-soluble substances and inorganic salts. With the extension of storage time, natural latex is prone to corruption and even solidification. This is because non-rubber substances such as sucrose in natural latex are metabolized by bacteria to produce volatile fatty aci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C1/04C08K3/22C08K5/41
CPCC08C1/04C08K3/22C08K5/41C08K2003/2206
Inventor 刘宏超王永周王启方余和平魏丽娜刘彦妮高新生曾宗强
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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