Ammonia-free preservative for natural fresh latex

A fresh latex, natural technology, applied in the field of natural fresh latex ammonia-free preservatives, can solve problems such as affecting product safety, environmental pollution, affecting latex stability and vulcanization performance, etc., and achieves low raw material cost, low fatty acid value, and good preservation. effect of effect

Active Publication Date: 2019-07-09
RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, with the massive harvesting of high-yielding clonal gum trees, the use of ethephon to stimulate production increase, and the modern rubber industry's requirements for mechanization, continuity, and automation, the traditional ammonia and ammonia composite storage system can no longer meet the requirements of modern rubber manufacturing. At the same time, due to the volatility and irritation of ammonia, it causes serious environmental pollution. TT has the risk of generating nitrosamines. Its existence affects the safety of products, and ZnO will affect the stability and vulcanization performance of latex. With the strengthening of national environmental protection, in the long run, the ammonia storage system will be eliminated, so the research and development of efficient and economical ammonia-free storage system has become an inevitable trend in the development of the natural rubber industry

Method used

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  • Ammonia-free preservative for natural fresh latex
  • Ammonia-free preservative for natural fresh latex
  • Ammonia-free preservative for natural fresh latex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1 provides a method for the preservation of natural fresh rubber latex without ammonia, which mainly includes the following steps: separately configure the bactericide and alkaline stabilizer in the preservation system into a 10wt% aqueous solution, and add the weight of natural rubber latex to the fresh natural rubber latex in advance. 0.1wt% alkaline stabilizer solution, after the fresh latex is taken back to the rubber collecting station (that is, adding the bactericide after adding the stabilizer for about 8-9 hours), add the bactericide of 0.1% by weight of the natural rubber latex, and stir and mix thoroughly After that, let it stand for storage, and regularly test the volatile fatty acid value of natural rubber latex.

[0048] The bactericide consists of equal weight of 2-bromo-2-nitro 1,3-propanediol (CAS number: 52-51-7), sodium dehydroacetate, BHT, cassone, DMDMH, BIT and sodium tripolyphosphate Composition; The alkaline stabilizer is disodium hydrogen ph...

Embodiment 2

[0050] Example 2 provides a ammonia-free preservation method for natural fresh rubber latex, which mainly includes the following steps: configure the alkaline stabilizer in the preservation system into a 10wt% aqueous solution, and add 0.1wt% of the natural rubber latex to the fresh natural rubber latex in advance. Bactericide solid, after the fresh latex is taken back to the rubber collection station (that is, the stabilizer is added after adding the bactericide for about 8-9 hours), add the natural rubber latex weight 0.1wt% of the alkaline stabilizer, stir and mix thoroughly, and store it statically , And regularly check the volatile fatty acid value and viscosity value of natural rubber latex.

[0051] The bactericide consists of equal weight of 2-bromo-2-nitro 1,3-propanediol (CAS number: 52-51-7), sodium dehydroacetate, BHT, cassone, DMDMH, BIT and sodium tripolyphosphate Composition; The alkaline stabilizer is disodium hydrogen phosphate.

Embodiment 3

[0053] Example 3 provides a ammonia-free preservation method for natural fresh rubber latex, which mainly includes the following steps: separately configure the bactericide and alkaline stabilizer in the preservation system into a 10wt% aqueous solution, and add the weight of natural rubber latex to the fresh natural rubber latex in advance. 0.12wt% of the bactericide, after the fresh latex is taken back to the rubber collection station (that is, the bactericide is added for about 8-9 hours and then the stabilizer is added), add the natural rubber latex weight 0.1wt% of the alkaline stabilizer, mix well and shake well After that, let it stand for storage, and regularly check the volatile fatty acid value and viscosity value of natural rubber latex.

[0054] The bactericide consists of equal weight of 2-bromo-2-nitro 1,3-propanediol (CAS number: 52-51-7), sodium dehydroacetate, BHT, cassone, DMDMH, BIT and sodium tripolyphosphate Composition; The alkaline stabilizer is disodium hy...

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Abstract

The invention relates to the technical field of natural rubber primary processing, and in particular relates to an ammonia-free preservative for natural fresh latex. An oxidation-type bactericide is selected from a large amount of solid, water-soluble, non-volatile and broad-spectrum bactericides aiming at pollution problems of ammonia and ammonia composite preservatives, and the oxidation-type bactericide is compounded with an alkaline stabilizer to be used as a preservation system of the natural latex. The novel preservation system provided by the invention has the characteristics of a goodpreservation effect, low costs, no ammonia, no volatilization, no irritation, easy solubility in water and convenient use, and can preserve the natural latex for a plurality of days, and the preparedraw rubber has excellent properties, especially has significantly-improved aging resistance; and in addition, the preservative can also be applied to early-stage preservation in the ammonia-free concentrated latex preparation process, and the overall costs are lower than those of a currently-used ammonia and TT/ZnO systems.

Description

Technical field [0001] The invention relates to the technical field of natural rubber preliminary processing, in particular to an ammonia-free preservative for natural fresh rubber latex. Background technique [0002] Natural rubber refers to a polymer material that is naturally synthesized from the Brazilian Hevea tree. According to process requirements, it is divided into natural rubber raw rubber and concentrated natural rubber latex. Natural latex collected directly from rubber trees is called fresh latex, which is a natural macromolecular emulsion formed by rubber particles dispersed in the water phase (ie whey). With different rubber tree strains and tree ages, as well as changes in planting environmental factors such as seasons and climate, the total solid content of fresh natural rubber latex varies greatly, generally between 20% and 45%. In fresh natural rubber latex, there are also a large amount of non-rubber substances, the content of which is equivalent to 5% of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08C1/06C08L7/02C08K13/02C08K3/22C08K3/06C08K5/09C08K5/32C08K5/053
CPCC08C1/06C08K3/06C08K3/22C08K5/053C08K5/09C08K5/32C08K13/02C08L7/02
Inventor 赵立广桂红星丁丽黎燕飞李艺璇黄红海李建伟
Owner RUBBER RES INST CHINESE ACADEMY OF TROPICAL AGRI SCI
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