Preservative for natural rubber latex and environment-friendly rubber

Abstract

The invention provides a preservative for natural rubber latex. The preservative comprises the following ingredients: 1-3% of nano titanium dioxide, 4-6% of ethylparaben, 30-35% of chitosan, 25-28% oflysozyme, 10-12% of pentaerythritol ester, 8-10% of sodium dithionite, 18-20% of benzoic acid and 2-4% of potassium ferrocyanide. The environment-friendly rubber has a simple production process, andafter the ingredients are added according to the specified amounts, full stirring is conducted, so that the dry content of the rubber and the content of total solid in the rubber are increased, the quality of the rubber is improved, and especially the strength, wear resistance, aging resistance are improved greatly.

Description

technical field [0001] The invention belongs to the technical field of rubber production, and in particular relates to a natural latex preservative and environment-friendly rubber. Background technique [0002] In the past hundred years, the difficult problem of natural rubber processing in the world has always been the research on the preservation (fresh preservation) and anticoagulation (coagulation) of natural rubber latex. The early preservation of fresh latex from the natural rubber tree to the factory is an important technical link in rubber tapping production. Natural rubber latex contains a lot of protein, sugar and lipids and other rich nutrients. If it is not kept fresh and anticoagulated for 6-12 hours, it will be easily infected by bacteria and various harmful bacteria. Odor, deterioration, curing, and corrosion make rubber latex deteriorate, water-gel separation occurs, and natural solidification occurs in the field. [0003] Common measures to prevent latex f...

AI Technical Summary

Problems solved by technology

However, there are many problems, such as: ammonia water pollutes the environment and is inconvenient to transport; ammonia is poisonous and harmful, corrosive, irritating, and volatile; it destroys the quality of rubber and reduces the dry content; the amount of ammonia added is small, and the purpose of freshness cannot be achieved; The high amount of ammonia added, on the one hand, increases the production cost, and mainly affects the solidification of latex, the drying of rubber and the quality of the final product (the rubber plasticity retention index is reduced, the color is deepened); the amount of acid used to neutralize ammonia in subsequent processing is wasted, such as using When formic acid is used as a coagulant, the amount of neutralized acid is 2.58 times that of the ammonia content in the latex, which greatly increases the cost of making rubber; when the amount of ammonia is too high, the ammonia combines with the organic latex and volatilizes, reducing the dry content of the fresh latex. It not only destroys the quality of natural rubber, but also reduces the weight of dry rubber; the use of ammonia water is harmful to the human body and damages the health of rubber farmers and rubber workers; the storage and transportation of ammonia water is costly and dangerous, and the discharge of ammonia-containing wastewater damages the environment

The formic acid coagulation technology usually used after ammonia addition has the following disadvantages: it is easy to cause the rubber molecules to be oxidized and damage the quality of the rubber; the effective curing time is about 10 hours, and a large-volume coagulation tank needs to be configured, which increases the demand for land area; Wastewater discharge containing ammonia and formic acid increases the pressure on sewage treatment

[0004] Disadvantages of formic acid (formic acid) solidification: highly irritating liquid, strong acidity and corrosion; damage to the ecological environment, harm to human body, animals and plants; easy to oxidize rubber molecules, so that the quality of rubber decreases; damage to the color of rubber, serious brown spots appear

Fifth, the solidification time is about 16 hours, and a large-volume coagulation tank needs to be configured, which increases the demand for land area; sixth, the discharge of wastewater containing ammonia and formic acid increases the cost of sewage treatment

Disadvantages of sulfuric acid coagulation: first, colorless transparent oily liquid, super acid, super oxidizing and corrosive; second, devastating casualties to animals and plants; third, serious damage to the ecological environment, compared with formic acid is stronger

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