A kind of method of tannic acid modified natural latex sponge product

Abstract

A method for modifying natural rubber latex sponge products with tannic acid, the first step: utilize soft water, concentrated ammonia water, nonionic surfactant or sodium lauryl sulfate to treat tannic acid to obtain a tannic acid solution, the tannic acid The nic acid solution is prepared according to the following mass proportions: tannic acid: 20 parts, concentrated ammonia water: 3-8 parts, nonionic surfactant or sodium lauryl sulfate: 3-5 parts, soft water: 70-75 parts. Step 2: using natural rubber latex as raw material, in the raw material preparation process, the tannic acid solution obtained above is evenly added in a mass ratio of 0.5 to 3.0 dry parts per 100 dry rubber, and dispersed in the natural rubber latex. The third step: Foaming, injection molding, gelling, vulcanization, demoulding, washing and drying to prepare sponge products. Adding tannic acid to natural rubber latex can eliminate the allergic reaction caused by water-soluble protein and the influence of variable price metal ions on the aging performance of products, and improve the aging resistance of natural latex sponge products and the antibacterial performance of natural latex sponge products.

Description

technical field [0001] The invention relates to a preparation method of a sponge product, in particular to a method for latex sponge products such as latex sponge pillows, latex sponge mattresses, latex sponge seat cushions, latex sponge car mats, etc., using tannic acid modified natural latex as raw materials. Background technique [0002] Natural rubber latex is derived from the Brasilian Hevea tree and is a natural polymer product. Its main component is rubber hydrocarbon, and also contains water and a small amount of non-rubber substances such as protein, sugar and inorganic salt. The main advantage of natural rubber latex is its excellent overall performance, which is specifically reflected in its good film-forming performance, high wet gel strength, and easy vulcanization. The resulting product has excellent elasticity, high strength, large elongation and relatively high Small creep. [0003] Sponge products prepared from natural rubber latex have the advantages of l...

AI Technical Summary

Problems solved by technology

Although the products produced by low-protein natural latex can alleviate the problem of protein allergy, the mechanical stability and thermal stability of low-protein natural latex are lower than those of ordinary concentrated natural latex, and the control is more difficult, which brings a lot of inconvenience to actual production

And compared with ordinary natural rubber latex vulcanized rubber film, the mechanical properties and product oxidation resistance of low protein natural latex vulcanized rubber film are reduced

[0006] Due to the large volume of natural rubber latex sponge pillows, mattresses and other products that have a large contact area with the air, sponge products generally have shortcomings such as insufficient aging resistance and easy aging.

At the same time, some variable price metal ions (such as iron and manganese ions) will promote the aging of natural latex sponge products and reduce their service life

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