Huang Hollyhock Fiber Structure And Performance Of Preparing And Study

Abelmoschus manihot(L.) Medic belongs to the Malvaceae family and widely distributed in the east tropical and subtropical area. The roots, stems, flowers and seeds of the A.manihot can all be exploited, collecting edible, medicinal, ornamental values. The studies on the A.manihot(L.) were mainly concentrated in herbalism, medicinal chemistry, pharmacology and clinical applications at now. However, A.manihot bast in the textile industry has not yet exploited. The test results of the chemical composition of A.manihot bast show that the main constituent of A.manihot bast is cellulose of41.80wt%. The degumming and bleading of the A.manihot bast were studied. The main contents and conclusions of this paper are as follows:1. Every factor influencing the pretreatment process and the degumming process was optimized, the optimum pretreatment time is60min, the optimal pretreatment temperature is50℃, the best concentration of the sulfuric acid dissolved in the pretreatment solution is lg/L. The results of the orthogonal optimization test for the degumming process are as follows:the NaOH concentration of alkali cooking is lOg/L, the time of alkali cooking is135min, the NaOH concentration of alkali-H2O2one bath is4g/L, the H2O2concentration is12g/L, the time is90min.2. The morphology structure of the A.manihot fibers was observed with optical microscope, SEM and TEM. The A.manihot fiber’s surface was covered with scales pattern, and the diameter of the fiber is10～15μm approximately. Based on the FTIR results, the main components of A.manihot fiber was cellulose same as cotton. The results of the X-ray diffraction spectrum indicates that the crystallinity of A.manihot fibers is63.73%closing to cotton, lower than ramie.3. The breaking strength of the A.manihot fasciculi is varied between1.77-3.38cN/dtex because of the uneven fineness, and the elongation at break is2.6%-3.7%. The moisture regain of the A.manihot fibers is9.64%, with better moisture absorption and desorption properties than cotton fibers. The electrical resistance of mass ratio of the A.manihot fibers is4.26×107Ω, closing to the natural fibers of cotton and flax.4. Thermal properties of the A.manihot fibers and cotton fibers were analyzed based on TG test results, which showed the rates of weight loss of the A.manihot fibers and cotton fibers were82.83%and81.66%respectively. The thermal degradation curve shows that the main components of A.manihot fiber was cellulose same as cotton. The A.manihot fibers were dyed with High-temperature reactive dyes, and the dyeing rates of the red reactive dyes and blue reactive dyes were62.9%and72.8%respectively. The A.manihot fibers after dyed show bright color while the softness is increased.