Li Hua Lv

The Effect of Ultrasonic Wave Pretreatment of Reed Leaf Cellulose Dissolved in Ionic Liquids

It took long time for reed leaf cellulose to dissolve in ionic liquid (1-butyl-3-methylimidazolium chloride), and part of the cellulose was degraded and the fiber strength reduced greatly. In order to decrease its dissolution time, the ultrasonic wave pretreatment was applied in this article. Results were showed through polarizing microscopy, SEM, FT-IR and XRD. By comparing the original fiber with the regenerated cellulose, it can be concluded that Ultrasonic wave pretreatment significantly increased the crystallinity of the fiber, weakened the fibrillation on fiber surface obviously, which proved the process was a physical change and did not affect the cellulose structure.

Preparation and Mechanical Properties of Cotton Stalk Bast Fibers Reinforced Polypropylene Composites

The cotton stalk bast fibers are a new kind of natural cellulose fibers, which have the similar properties as the flax fibers. Polypropylene (PP) is a type of matrix material and commonly used in composites. The cotton stalk bast fibers as reinforced materials and PP as matrix were used to make a new kind of composite in the experiment. The composites were prepared by mixing, molding and cold forming. Orthogonal experiment table including mass fraction of fibers, molding temperature, molding pressure and molding time was devised. Then the flexural strength, tensile strength and impact strength were tested and the analysis of range was done. The optimal processing condition was obtained as follows: mass fraction of fibers was 30%, molding temperature was 190°C, molding pressure was 12MPa and molding time was 480s. The result showed that the cotton stalk bast fibers reinforced PP composites had good mechanical properties.

Kinetics and Thermodynamics of Cd(II) Sorption onto Sodium Alginate/Poly(Vinyl Alcohol)/Hydroxyapatite Composite Fiber

In this paper, the sodium alginate (SA)/poly (vinylalcohol)(PVA)/hydroxyapatite (HAp) fiber was prepared via solution spinning. The adsorption properties of SA/PVA/HAp composite fiber were studied,and the adsorption kinetics and isotherms were investigated. The experimental results showed that the adsorption process was fast, in which half-equilibrium and equilibrium was obtained in 5 and 30 minutes, respectively. The pseudo-second-order kinetic model provided a better correlation of the experimental results. Both of Langmuir isotherm and Freundlich isotherm could describe the adsorption behavior of SA/PVA/HAp composite fiber towards cadmium. The positive H° value and increased absolute value of the G° with temperature indicate that high temperature is good to the adsorption process.

Design and Manufacture of 3D Flat Woven Fabric

In the ordinary loom, the 3D woven fabrics like the orthogonal/connected stitching structure, angle Alliance/interlocked stitching structure by the reasonable transformation, weaving diagram and looming draft, have been woven in this paper. Using ordinary loom weaving fabrics, it would not only save the cost of production, but also has good controllability of woven fabrics. Good structural design and integrity of the 3D woven fabrics, own tight fabric structure, superior mechanical properties, low price, and broad application prospects. The results shows that this design would give a basis for further study on the development perform of 3D textile structural composite materials.

Sound Insulation Properties of Abandoned Fibers Composites

In this article, in order to study the sound insulation properties, abandoned cotton and jute fibers were conducted as reinforced materials, TPU and PP were conducted as matrix materials, and double roller mixing and hot pressing molding processes were adopted to prepare composites. Through the L12 (42×13) mixed orthogonal experiment, cotton/TPU, cotton/PP, jute/TPU and jute/PP composites were prepared respectively. Standing wave tube and impedance tube’s sound absorbing and insulation test system which was produced by Beijing Prestige Company were employed to test the sound insulation (transmission loss). And they were used origin software to analyze. Universal mechanical testing machine and Jane suspension combined impact tester were employed to test tensile, bending and impact strength of jute/TPU composites. Results were showed that four kinds of composites had excellent sound insulation properties. And the jute/TPU composite was the most optimal. Under the conditions of thickness in 6 mm and frequency at 6300Hz, transmission loss of jute/TPU composites was up to 30 dB and it had excellent mechanical properties.

Assessment of Feasible Recycling Ways on Waste Textile Fiber Materials

The recycling process of waste textile fiber materials could be divided into two parts: one is that waste textile fiber materials turn into recycled fibers, and the other is the use of recycled fiber process. To solve the first problem, it’s important to classify it in a reasonable way. In accordance with the main characteristics of fiber materials, new model of classification is established through three elements: color, finishing agents and twist. According to the new model of classification and different requests in recycled fiber, twenty-seven methods are proposed. Furthermore, taking waste polyester fiber materials as an example, economic cost analysis is used to assess the feasible ways in recycling waste fiber materials.

Immobilization of Hydroxyapatite Particles onto PET Filter Fabric via Heat Treatment

Heat fusion method and hot-press method were applied to immobilize hydroxyapatite (HAp) particles onto the surface of PET filter fabric separately. The effects of treating temperature, treating time and HAp amount on immobilization rate of HAp and pore size of filter fabric were discussed. The high immobilization rate of HAp could be obtained and pore size could be maintained. FTIR, SEM and XRD were used to characterize the structure of filter fabric embedded with HAp particles. Good adsorption property of Cd2+ onto HAp immobilized filter fabric was achieved.

Dye-Free Coloration in Dyeing and Printing of Tussah Silk Based on PHBA

Dye-free coloration in dyeing and printing for tussah silk were studied in different conditions. The optimal processes of dye-free and printing has been got. The optimal process of dye-free was PHBA1.5%, acid 14%, 60°C for 30 min, then add H2O2 for oxidation. And the optimal printing process of dye-free was PHBA2.0%, acid 18%, steam for 20 min after being printed. Colored and printed tussah fabric reactions occurred in the fabric itself, so the mechanical properties of chromogenic fabric unchanged almost, which had excellent color fastness and levelness.

Analysis of Certain Phenomena in Tussah Silk Dye-Free Coloration

Different color tussah fabric was got applied by dye-free coloration technology. When tussah fabric was treated with p-hydroxybenzaldehyde, red tussah fabric was obtained by coloration directly and two-step for deeper color, and brown color fabric was shown in one-bath coloration. In this paper, some phenomena showing in different processes of dye-free colorations was analyzed.

Kinetics and Thermodynamics of Sodium Alginate/Hydroxyapatite Composite Adsorption Fiber for Cd(II) Adsorping

In this study, kinetics and thermodynamics of sodium alginate/ hydroxyapatite composite adsorption fiber for adsorping Cd () were studied. The morphology and structure were characterized by SEM and IR, and the effects of pH value and bath ratio on Cd () adsorption were discussed. The model of adsorption kinetics and thermodynamics were simulated, and the parameters were calculated. The results showed that the sodium alginate/hydroxyapatite composite adsorption fiber possessed good adsorption ability towards Cd (). The optimum adsorption was found at the pH value of 6-7. High removal percent of more than 90% at low concentration and high concentration of Cd () was obtained at the bath ratio of 1:100 and 1:1000, respectively. The adsorption kinetics and thermodynamics studies showed that the pseudo-second-order model and Freundlich isotherm described the adsorption behaviors well. The thermodynamic parameters indicated that the adsorption of Cd () onto sodium alginate/hydroxyapatite composite adsorption fiber was physical and chemical sorption, endothermic in nature.