Method for preparing ramie fibers through oxidation, degumming and repeated multiple-step feeding

Abstract

The invention provides a method for preparing ramie fibers through oxidation, degumming and repeated multiple-step feeding, which comprises three feeding processes and comprises the following specific steps: in the first feeding process, preparing a degumming solution from surfactant, a fiber expanding agent, peroxide stabilizer, a defoaming agent, sodium hydroxide, peroxide and water, mixing raw hemp of ramie and the degumming solution to form a degumming solution system, and heating to remove part of colloid; in the second feeding process 20-50 minutes later, adding peroxide and sodium hydroxide, and keeping the temperature to further remove the colloid; in the third feeding process 20-50 minutes later, adding peroxide, and further keeping the temperature until the reaction is finished and the colloid is completely removed; and finally, washing refined dried hemp fibers with clear water, oiling, drying, opening, and combing to obtain the prepared ramie fibers. The method provided by the invention overcomes the defects in the existing oxidation and degumming technology; a repeated multiple-step method is used, so that the reaction is uniform and moderate, the damage to the fibers caused by over too high initial concentration of initial concentration is reduced, and the quality of the refined dried hemp product is improved; and meanwhile, the ineffective decomposition of the peroxide and the consumption of the defoaming agent are reduced, thereby saving the cost.

Description

technical field [0001] The invention relates to a method for preparing ramie fibers by oxidation degumming and feeding in multiple steps, and belongs to the technical field of degumming process methods in the textile field. Background technique [0002] In oxidative degumming, if the initial concentration of peroxide is too high and the temperature is too high, the molecular structure of cellulose will be destroyed. Under alkaline conditions, peroxide will not only oxidize the colloid in the raw hemp, but also oxidize the cellulose in the raw hemp to form oxidized cellulose that is unfavorable to the lean and dried hemp. Therefore, in the process of oxidative degumming, it is necessary to control the heating rate and the degumming temperature of the peroxide, add a peroxide stabilizer, and at the same time control the release and decomposition rate of the peroxide, try to avoid or reduce the ineffective decomposition of the peroxide, and reduce the The degree of oxidation o...

AI Technical Summary

Problems solved by technology

The conventional oxidation degumming process is generally one feeding, and the feeding concentration is too large, which will cause the effective oxygen in the peroxide to be decomposed before it can react with the gum, and the ineffective decomposition of the peroxide will lead to degumming and bleaching effects. reduce

At the same time, due to the rapid decomposition of available oxygen components, the degumming of ramie fibers is uneven, and local decomposition is excessive, resulting in large fiber damage.