Natural rubber white odorless spongy cushion for in situ color-protecting shoes and preparation method thereof

Abstract

The invention discloses a natural rubber white odorless spongy cushion for in situ color-protecting shoes and a preparation method thereof. The raw materials of the spongy cushion comprises natural rubber, sulfur, an accelerating agent, a vulcanizing active agent, a hole-forming agent AC (activated carbon), titanium white, 5# engine oil, kaolin, a rubber odor-removing agent and a foaming agent OBSH (oxybis(benzenesulfonyl hydrazide)). In the invention, the odorless spongy for shoes is prepared by utilizing the natural rubber as a main body; vulcanization is promoted by using a thiuram accelerating agent TMTD (tetramethyl thiuram disulfide) to inhibit the high-temperature ageing of the natural rubber, thereby ensuring that titanium white and kaolin filled white spongy rubber do not generate high yellowing to discolor the bottom surfaces in the shoes; the foaming agent AC and OBSH are jointly used, so as to achieve the shape keeping property and even bubbles and low odor of the inner bottoms of the spongy shoes; because no water gas is generated in the foaming process of spongy, heterochromatic substances are not dissolved and transported to cause the yellowing and discoloring of white soft goods of the inner bottoms of the shoes, thus the spongy cushion has abundant white keeping capacity; and the odor generated in the process of vulcanizing the spongy rubber can be effectively removed through the rubber odor-removing agent.

Description

technical field [0001] The invention relates to a processing technology for rubber soles, in particular to a natural rubber white odorless sponge pad for in-situ color-preserving shoes and a preparation method thereof. Background technique [0002] At present, in the vulcanization process of rubber for shoes, there are the following problems: (1) Due to the action of high temperature on the rubber mixture, polymer cracking occurs to produce low volatiles - aldehydes, amines, SO2, ammonia SH, CH4, etc., forming odors; (2) Accelerators and other materials do not fully participate in the vulcanization and cross-linking reaction, forming volatile gases and producing odorous rubber; (3) The amines, hydrogen sulfide and other substances formed by the decomposition of proteins contained in rubber form odors, and the use of rubber smells bad. (4) Because the accelerator system used in the conventional method—the accelerator M+DM+D has little protective effect on the thermal aging de...

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Problems solved by technology

[0002] At present, in the vulcanization process of rubber for shoes, there are the following problems: (1) Due to the action of high temperature on the rubber mixture, polymer cracking occurs to produce low volatiles - aldehydes, amines, SO2, ammonia SH, CH4, etc., forming odors; (2) Accelerators and other materials do not fully participate in the vulcanization and cross-linking reaction, forming volatile gases and producing odorous rubber; (3) The amines, hydrogen sulfide and other substances formed by the decomposition of proteins contained in rubber form odors, and the use of rubber smells bad. (4) Because the accelerator system used in the conventional method—the accelerator M+DM+D has little protective effect on the thermal aging degradation of natural rubber, the color of the rubber after vulcanization is serious and the color retention is poor

[0003] Generally speaking, the methods to eliminate rubber odor are: (1) In industrial production, additives such as essence and fragrance are added to rubber materials, hoping to cover the odor through fragrance, but in essence it cannot solve the fundamental problem and is harmful The smell still exists, and it will come out again after a short time, the effect is not good

(2) Put the item in a ventilated place for a few days to remove it naturally; (3) In order to obtain an odorless sponge rubber, sodium bicarbonate and urea are usually used as foaming agents, but due to the inherent characteristics of the two, the product has two deficiencies First, the dispersion of the two in rubber is poor. During the high-temperature decomposition and foaming process, concentrated water droplets are easily formed, which will take the colored substances in the rubber out of the surface of the sponge pad, and form yellow spots on white textile materials. The product The grade is low; the second is that the sponge foams to form an open-pore structure, the service life is not long, the elasticity is low, and the fatigue of the human body is high after exercise

Since none of the above methods meet the requirements

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