Ammonia-free preservation method for natural fresh latex

Abstract

The invention provides an ammonia-free preservation method for natural fresh latex. The ammonia-free preservation method comprises the following steps: S1, preparing a preservative; S2, preserving the fresh latex; and S3, conducting centrifugal degerming. According to the preservation method for the natural fresh latex, a proper preservative is adopted and is added into the natural fresh latex according to a scientific proportion so as to replace a traditional preservation system; and ammonia and zinc ions are reduced or prevented from entering concentrated latex from the source, so the stability of the concentrated latex is improved, and the latex is few in gel particles, low in viscosity, high in plasticity retention rate, strong in stability and long in preservation time (up to 361 days).

Description

technical field [0001] The invention relates to the field of natural latex, in particular to an ammonia-free preservation method for natural fresh latex. Background technique [0002] Natural latex is a thermoplastic synthetic resin of rubber type, which has the characteristics of high elasticity and good bonding and film-forming properties. The latex contains protein and sugar, which will solidify the natural latex under the action of microorganisms or enzymes. If fresh latex is not After any treatment, obvious corruption or weaving will usually occur after about 6 to 12 hours, and the corruption will be faster at high temperatures, thereby affecting rubber production and farmers' economic benefits; and in order to improve the heat resistance and durability of natural rubber latex, In order to achieve a longer storage time, ammonia water is generally added to store the latex in a flowing liquid state almost infinitely. Although the latex has not solidified, this latex conta...

AI Technical Summary

Problems solved by technology

[0002] Natural latex is a thermoplastic synthetic resin of rubber type, which has the characteristics of high elasticity and good bonding and film-forming properties. The latex contains protein and sugar, which will solidify the natural latex under the action of microorganisms or enzymes. If fresh latex is not After any treatment, obvious corruption or weaving will usually occur after about 6 to 12 hours, and the corruption will be faster at high temperatures, thereby affecting rubber production and farmers' economic benefits; and in order to improve the heat resistance and durability of natural rubber latex, In order to achieve a longer storage time, ammonia water is generally added to store the latex in a flowing liquid state almost infinitely. Although the latex has not solidified, this latex contains a large number of inactive bacteria, and ammonia is a volatile preservative. It is easy to become soft during the drying process, and the ammonium salt produced makes the drying rate slower and the plasticity retention rate of raw rubber is reduced. The traditional ammonia and ammonia composite storage system can no longer meet the requirements of modern rubber production.

[0003] Therefore, all are researching the preservation method without ammonia at present, and wherein patent " a kind of green environmental protection natural latex and its non-ammonia preservation method ", patent number: CN112011101A, fresh latex is preserved through adding non-ammonia preservative, although reached no The state of ammonia, but the preservation effect is not good, and the preservation time is short

Patent "a natural fresh latex ammonia-free preservative", patent number: CN109988257B, uses an ammonia-free preservative, but the preservative contains a high proportion of zinc oxide, and the zinc ions and zinc-ammonia complexes of concentrated latex will be compressed The electric double layer of latex particles reduces the repulsion between latex particles, leading to the generation of unstable factors in concentrated latex

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