Method for preparing sponge products from tannic acid modified natural latex

Abstract

The invention discloses a method for preparing sponge products from tannic acid modified natural latex. The method comprises the following steps: the first step: treating tannic acid by using soft water, strong ammonia water and a nonionic surfactant or sodium dodecyl sulfate so as to obtain a tannic acid solution, wherein the tannic acid solution is prepared from the following ingredients in mass ratio: 20 parts of tannic acid, 3-8 parts of strong ammonia water, 3-5 parts of the nonionic surfactant or sodium dodecyl sulfate and 70-75 parts of soft water; the second step: with natural latex as a raw material, uniformly adding and dispersing the tannic acid solution into natural latex according to the mass ratio that 0.5-3.0 parts of the tannic acid solution is added into each 100 parts of dry natural latex in a raw material preparation process; the third step: bubbling, carrying out injection molding, carrying out gelatinization, vulcanizing, demoulding, washing with water and drying so as to obtain the sponge products. According to the invention, since tannic acid is added into the natural latex, anaphylaxis caused by water soluble protein as well as influences of variable-valence metal ions on ageing performance of the products are eliminated, and ageing resistance and antibacterial properties of the natural latex sponge products are improved.

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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