Ultralow-ammonia concentrated natural latex and preparation method thereof

Abstract

The invention discloses a preparation method of ultralow-ammonia concentrated natural latex, and the preparation method comprises the following steps: S1, collecting fresh latex, and pretreating; s2,adding ammonia, a sterilizing fresh-keeping agent and phosphate, adjusting the mass fraction of the ammonia to 0.15-0.25%, uniformly stirring, clarifying for 8-72 hours, and removing sediments; s3, transferring the clarified latex to a centrifugal machine to be centrifuged, separating out skim latex and concentrated milk, transferring the concentrated milk to an adjusting tank, immediately addingthe sterilizing fresh-keeping agent and lauric soap, fully and uniformly stirring, and accumulating the concentrated milk to obtain concentrated latex; and S4, adjusting the dry glue content in the concentrated latex. By adopting the preparation method of the ultralow-ammonia concentrated natural latex provided by the invention, the effects of sterilization and bacteriostasis can be achieved for along time, the latex character is more stable, the use amount of ammonia can be reduced, no irritation is caused, the environment is protected, the use amount is small, and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of natural concentrated latex production, in particular to an ultra-low ammonia concentrated natural latex and a preparation method thereof. Background technique [0002] Soon after the natural rubber latex flows out from the tree, the enzymes and bacteria start to act, especially under the action of oxygen and light, they become more active, decomposing the proteins, sugars, esters, etc. in the latex to generate organic acids or spoilage substances, neutralizing the rubber The charges on the particles cause coagulation. On the one hand, the presence of metal salts reacts with the protective layer in the latex, and on the other hand, it can also promote the activation of enzymes and bacteria. Among them, magnesium ions have the greatest impact, which also promotes the coagulation of latex. For these reasons, usually 6 to 12 hours after tapping, the latex will naturally solidify. If the latex is coagulated,...

AI Technical Summary

Problems solved by technology

However, there are two major problems in the product after adding ammonia: one is the odor problem, the human body is unacceptable to the smell of ammonia volatilized in the product or it may cause skin allergies, which is irritating and harmful to human health, and may also affect the export of the product; The other is a chemical problem. The vulcanization process of natural latex is a chemical cross-linking process. The presence of ammonia will cause harmful side reactions in this process, resulting in difficulty in vulcanization. It has a certain impact on the application of natural latex and the development of modification technology. limits

[0003] With the rapid development of the rubber industry, the traditional ammonia sterilization preservation system can no longer meet the requirements of modern rubber production. At the same time, due to the volatility and irritation of ammonia, it causes serious environmental pollution. Therefore, the development of efficient and economical non-toxic Ammonia or low-ammonia natural rubber latex production technology has become an inevitable trend in the development of natural rubber industry