Rapid-granulating and curing process of natural rubber

Abstract

The invention provides a method for quickly granulating and solidifying natural rubber latex. The invention is characterized in that the method comprises the steps as follows: the natural rubber latex is dropped into an alcoholic solution containing polyvinyl alcohol and calcium ions at room temperature; the latex surface is solidified and is automatically granulated and sedimentated in the alcoholic solution; latex particles are separated; and the separated latex particles are dried. The method can quickly acquire rubber particles with smooth, round and non-adhesive surfaces, has no pollution during the whole production process, and ensures that the production quality meets rubber processing requirements, thereby the method is the latest domestic natural rubber solidification technology.

Description

Rapid granulation and solidification method of natural rubber latex technical field The invention belongs to a method for coagulating natural rubber, in particular to a method for quickly granulating and curing natural rubber latex Background technique Natural rubber (NR) is a natural biosynthetic high polymer and an important industrial raw material with complex composition, which contains a lot of water except for 5% non-rubber components. Natural rubber latex must go through process steps such as coagulation and drying to produce standard rubber. Therefore, the coagulation of natural rubber latex is an important part of rubber processing and directly affects the quality of rubber. Generally, there are three methods for the coagulation of fresh latex. One is a chemical method, that is, adding a coagulant such as acid, salt, and a dehydrating agent to make the latex solidify; the other is a physical method, which uses heating, freezing or strong mechanical stirring to ma...

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Problems solved by technology

Among them, the acid coagulant is the most widely used coagulant in the production process of natural latex raw rubber. At present, acetic acid is generally used as the coagulant in the rubber industry at home and abroad. Although its coagulation effect is good, there are many defects. One is acetic acid. Raw materials are expensive and difficult to obtain; second, acetic acid has a pungent smell, corrodes human skin and equipment, and produces a large amount of waste liquid during the production process, which is not conducive to environmental protection; third, the solidification time is long, and granular products cannot be obtained. The rubber needs to be further crushed, which is not conducive to post-processing; Fourth, the acid liquid has a significant impact on the quality of the cured rubber, causing the rubber to blacken and produce peculiar smell