Salix Liquefied Product Synthesis Spinning And Spinning Of Liquid

In this thesis, the two synthesis process and progress of spinning solution were studied. The spinning solution were attained by liquefaction of renewable Salix by phenol, ethylene glycol as the liquid agent, sulfuric acid as catalyst. And its ideal conditions were employed by the exchange experiments, spinning the curing process of influencing factors and precursor properties were compared, and the main conclusions are as follows:1. By range analysis methods, spinning solution synthesis process were compared, and the ideal conditions are: liquefied; synthesis temperature of 115℃, synthetic dosage of 5%, heating time, 40min; liquefied ethylene glycol; reaction temperature is 70℃, reaction time was 10min.2. For the synthesis of liquefied spinning solution with phenol, spinning viscosity increase with the increase of synthesis dosage. The spinning liquid synthesis system was sensitive to temperature, the viscosity of the spinning solution increased with the synthesis temperature, but if spinning temperature is too high, spinning solution would clot and cannot be as liquid silk; whereas temperature is too low, spinning liquid reaction synthesis system is difficult. In the same other conditions, with the synthesis heating time increasing, the degree of the synthesis reaction and synthetic viscosity did not change much. The spinning solution viscosity increases with synthesis the reaction time of polyurethane. While the reaction time was 20min, drawing would be difficult and would influence greatly on the performance of the original wire.3. The FTIR spectral analysis of two spinning dope obtained: synthesis of liquefied spinning liquid system, at 120℃, hexamine decomposition of formaldehyde and benzene ring in liquefied The addition reaction, making fiber to re-connect small molecules, the spinning solution to improve cross-linking degree, then that is beneficial to wire. Synthesis glycol liquid spinning solution, the liquid material on the hydroxyl whether alcohol or phenolic hydroxyl has high activity, with the MDI isocyanate reaction to form a large number of chemical cross-linking bond to produce urethane groups . Obtained with the spinning of polyurethane spinning solution.4. The analyse of the factors influencing on liquefaction on spinning and curing by the original Silk Textile processing show that the original wire's tensile strength, initial modulus, elongation at break increased with the increasing of drawing speed. The rate of increase was relatively large, and tensile strength increased by 24%; modulus increased by 10%; elongation increased 17.5%, while the tensile speed is increased 1cm3/min, The greater the tensile speed, the smaller diameter of the original wire. And the original wire diameter decreased 23%, with the tensile speed is increased 1cm3/min. When the curing time is below 2h, the tensile strength of the original wire increase fast; more than 2h the strength increase inapparently. Tensile modulus and elongation at break were at maximum during the curing time by 3h. Strand tensile strength and modulus first increase and then decreased as the heating rate increased, and the peak shown at 15℃/ h; but elongation rate has been increased continuely, and the increase range is 124 % at 25℃/ h.5. The ideal precursor preparation conditions:The ideal preparation conditions of Salix precursor liquefied by phenol are: roller speed of 72r/min, curing time of 3h, curing heating rate 15℃/ h. The ideal preparation conditions Salix liquefied ethylene glycol precursor are: drawing speed of 6cm3/min with natural air-dry.6. The tensile strength, initial modulus varied greatly obtained by phenol. Spinning solution's viscosity by phenol is relatively smaller than that by ethylene glycol, so drawing of the former is easier, and the original wire diameter is smaller, the elongation at break is smaller. Mechanical properties of the original wire by ethylene glycol is relatively stable. Due to the high elasticity of polyurethane materials, raw silk by ethylene glycol has longer elongation and larger tensile strength than by phenol, and the rebound into the wire made the larger diameter.