Advanced Materials Research Vols. 781-784

Abstract: Effects of mercerizing treatment on water-retention value of straw pulp fibers were discussed and the mercerizing treatment conditions were optimized. The best conditions of mercerizing treatment is NaOH concentration of 4mol/L, temperature of 40°C and processing time of 60min. SEM showed that the fiber cell wall swelling increase after mercerization.

Abstract: This paper studied the differences of pulping performances, beating characteristics and strength properties between green liquor pretreatment-Kraft pulping and conventional Kraft pulping based on previous optimized pulping conditions. The green liquor pretreatment-Kraft pulping has higher yield, lower Kappa number, reduced residual effective alkali and decreased viscosity. Green liquor pretreatment improves pulp strength properties although green liquor pretreatment-Kraft pulp has beating characteristics similar to conventional Kraft pulp.

Abstract: Green liquor has lower hydroxide concentration and higher sulfidity, which makes it a better choice for modified alkali cooking. This paper studied process parameters of pretreatment stage on pulping properties of poplar green liquor pretreatment-Kraft pulping process. Conditional experiments with green liquor charge of 0.50L/kg, 0.75L/kg, 1.00L/kg and 1.25L/kg, maximum pretreatment temperature of 95°C, 105°C, 115°C and 135°C, and holding time of 30min, 60min and 90min, were carried out. The results shows that optimal pretreatment conditions are as follows: green liquor charge, 1.00L/kg; maximum pretreatment temperature, 115°C; holding time, 60min; and wood to liquor ratio, 1:4.

Abstract: DTPMPA (Diethylene Triamine Penta Methylene Phosphonic Acid) was used as cooking additive in Bamboo pulping. The effect of cooking parameters such as alkali charge, maximum cooking temperature, and time at maximum temperature on bamboo kraft pulping adding additive Diethylene Triamine Penta Methylene Phosphonic Acid was studied. The results show that the optimized bamboo kraft pulping conditions are: alkali charge 17%, maximum cooking temperature 162°C, and time at maximum temperature 60min when DTPMPA dosage is 0.4%. On the optimized conditions of cooking, the highest screened bamboo pulp yield 49.52%, the kappa number of bamboo pulp is 24.68, residual alkali in kraft waste liquor 3.62g/L .

Abstract: In this study, nanocrystalline cellulose (NCC), isolated from the bleached aspen kraft pulp, was surface modified using borate. The resultant nanocrystal suspensions, namely B-NCC, were characterized by conductometric titration and atomic force microscope (AFM). B-NCC was then applied as a retention aid in the bleached old newsprint deinked pulp. The results showed that the modification process led to a negative increase in surface charge density, while the particle size was not changed. The fines retention and pulp drainability were increased when the B-NCC was used either alone as the monocomponent retention aid, or together with cationic polyacrylamide (CPAM) to constitute a microparticle retention system. The microparticle retention system gave better retention and drainage rate, with the maximum values of 90.5% and 3.5 ml/s, respectively.

Abstract: The Masson thermomechanical pulp (TMP) which was obtained from the first stage refiner was pretreated with xylanase followed by refining with PFI refiner. The impact of enzymatic refining on wet-end chemistry and bleachability of pulp were studied. The results showed that the enzymatic pretreatment could improve the wet-end chemistry properties and enhance the bleachability of masson TMP. In contrast to the control pulp sample, the beating degree, the zeta potential, the dissolved charge, the filler retention, and the sizing degree was increased respectively by 18.8%, 17.5%, 10%, 19.6%, and 18.8% at the xylanase dosage of 0.3 AXU/g (o.d. pulp); the tensile index, the tearing index and the brightness was increased by 2.3 N·m²/g, 0.19 mN·m2/g, and 1.3%ISO, respectively.

Abstract: Spandex fabric is widely used with excellent elasticity. The oil (especially a silicone oil), which is used for easement of processing is difficult to be removed in the former processing, furthermore only rely on a treatment agent is very difficult to achieve the cleaning effect. This article we attempted to take advantage of a complex of anionic surfactants and a nonionic surface active agent to built Anionic / non-ionic agents, which has better foaming stability and the fabric processed has better whiteness, the capillary effect, the elastic elongation and elastic recovery compared to the fabric of the normal treatment.

Abstract: As a small molecule and cationic accelerating agent, octyl hexyl dimethyl ammonium bromide (OHDMAB) is a very effective accelerator in dyeing silk with reactive dyes. In this paper the accelerant mechanism of OHDMAB was studied. The results showed that OHDMAB can promote the aggregating of dye molecules in aqueous solution efficiently. With the change of the temperature, the concentration of accelerating agent, the aggregation of dye molecules varies to some extent. As a result, the maximum absorption wavelength of dye, the particle size of dye in aqueous solution, and the surface potential are changing regularly. OHDMAB can make the surface voltage of silk positive easily, this maybe the most important factor of the mechanism of the OHDMAB accelerant.

Abstract: In this work, the crimp properties of PTT/PET bicomponent filament with different component ratios were investigated. The results show that, after boiling water treatment for 15 minutes, the crimpability of 50/50 component ratio is superior to that of 40/60 and 60/40 component ratio. Heat treatment can realize the shrinkage difference of the two components in a biocomponent filament and enable the biocomponent filament to have good crimpability and bulkiness. In addition, different heat treatments, heat treatment time and heat treatment temperature can also bring different crimp effects to the biocomponent filaments.

Abstract: Several cationic water-based polyurethanes end-capped with silicone coupling agent with different ion abundance are prepared. The effects of ion abundance of those polyurethanes on its emulsion particle size distribution, wet rubbing fastness improvement, hydrophility and soft handle are studied. The results show that the sample with moderate cationic ion abundance has optimal efficiency for color fixing of reactive dyes, and the quaterized cationic groups in polyurethane molecule should has positive contribution to hydrophility and soft handle of the treated fabric, especially for the color fabric treated with higher concentration polyurethane emulsion.