There is a cationic group that makes sure waterborne polyurethane self-emulsify on the main or side chain of cationic waterborne polyurethane (CWPU), which brings excellent function to cationic polyurethane, simultaneously it reduces water resistance. In this research, the good stability of CWPU was prepared as well as the water resistance and softness of cationic waterborne polyurethane film was improved. Elasticity, extensibility, weight gain rate, contact angle, TG, and structure of polyurethane had been tested and evaluated. Also, emulsion stabilities of polyurethane were tested, including storage stability, high-temperature stability, freeze-thaw stability, electrolyte stability, acid stability, and dilution stability; In addition to that, particle size and its distribution were tested. The test showed that the emulsion stability of polyester polyurethane illustrated a good result, while the mechanical property, water resistance, and water repellency were poor. Moreover, mechanical property and water resistance of polyether polyurethane film were good, but high-temperature stability, acid and alkali resistant, and water repellency of emulsion showed poor. For the synthesis of polyurethane, mixed soft segments of polyester (PE2348) and polyether (ZC330) were used, when mass ratio of (PE2348) to (ZC330) is not less than 1, that helped to improve the emulsion stabilities, increased contact angle, decreased particle size. But the water-resistance of film weakened when mass ratios of PE2348 to ZC330 were increased and the mechanical property was poorer. TG showed that thermal stability became poor. The introduction of hydrophilic chain extender (N120) can reduce the water resistance and water repellency of polyurethane. When the mass fraction of N-methyl diethanolamine (MDEA) was about 6% to 7%, the smallest particle size was 61 nm, and the water repellency was larger. The increase of MDEA content would reduce the water-resistance of the film. Finally the effect of hydrophilic chain extender on waterborne polyurethane was studied.
By nature, pineapple fiber (PALF) obtained from pineapple leaf is a smooth, shiny and white natural cellulosic fiber. In current investigation of spinning technique for pineapple leaf fiber based on cotton spinning method comparison of produced yarn properties has been reported. For one of the investigations of this study, the fibers were cut into staple length and various properties of fibers were analyzed. Data and results acquired from this illustrated that there is excellent spinnability on the fiber. Two separate researches were conducted with consideration to produce resultant yarn by spinning of PALF. Yarn derived by solo spinning technique of 100% PALF and PALF blending with polyester and cotton fibers through binary blending technique in equal proportion has been spun, then yarn count, tensile properties, yarn evenness, hairiness have been evaluated and analyzed. The results from numerical simulations analysis indicated that yarn obtained from the Pineapple leaf fiber (PALF) had great potential to be used in apparels.
The main purpose of this research work is to improve anti-static properties of Cashmere fabric by introducing application comprising anti-static agent by foaming which was made with cationic waterborne polyurethane and graphene-CNC. Cashmere fabric was cut into 10 pieces of sample cloth of 5 cm * 5 cm size, washed with acetone solution, and then dried in an oven at 60 ˚C. Three forms of waterborne polyurethanes such as two forms of Cationic waterborne polyurethane (CWPU) and a form of Anionic waterborne polyurethane (AWPU) were synthesized. Cellulose nanocrystalline (CNC)/graphite powder solution with the ratio of 0.5/1, 1/1, 2/1 was prepared by ultrasonic probe stripping method, and the concentration of graphite powder was ensured to be 1 mg/ml. The fabric was treated with anionic and cationic WPUs foaming solution until the weight gain reached 2.5-3.5 wt%. After drying, the elastic cloth was foamed with graphene solution until the graphite content of the cloth was close to 10%, 20%, 40%, 60% respectively, and then dried for reserving. Characterization properties of pure graphite powder, pure CNC and graphene solution with different proportions of three components were tested by Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), Thermalgravitimetric analysis (TGA) and scanning electron microscopy (SEM). Take the original cloth, only WPU treated cloth and four clothes with different graphite content for the fabric performance test.
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