Excerpted from the British "Textile Society"
Cotton fabric dyeing and mechanical properties treated with NaOH/Night ammonia and liquid ammonia/NaOH. The cotton fabric after desizing and scouring was treated with NaOH liquid ammonia and liquid ammonia/NaOH two-step method to determine the effect of the treatment sequence. Crystallinity, moisture regain, water absorbability, and KES mechanical properties. Although the crystallinity of cotton fibers treated by these two methods is significantly reduced, the water absorption of fabrics treated with NaOH/NB is reduced compared to untreated fibers. The water absorption with NH/NaOH treatment increased; the initial dyeing rate of C.1 Direct Blue 1 on NaOH/NH3 treated fabrics decreased, while the NH3/NaOH treated fabrics significantly improved, however, with untreated fabrics. The dye satin absorption rate of the same dye on both treated fabrics is improved according to the fabric feel shear and bending hysteresis curve measured by KES instrument, and the shear modulus and shear hysteresis width of the NaOH/NH3 treated fabric are higher than The NH3 treated fabric is much smaller, but the NH/NaOH treated fabric has a smaller shear modulus and shear lag than the NaOH treated fabric. Based on these results, it is understood that fabrics treated by two-step method such as NaOH/NB and NB/NaOH have softer handfeel than those treated with NH3 and NaOH, respectively.
Reducing formaldehyde in paint printing paste with soy protein hydrolysate This study shows that the hydrolyzed soy protein can absorb most of the formaldehyde emitted from the paint printing paste on the fabric with a hydrolyzed soy protein scavenger urea scavenger to prepare the paint printing paste. The cleaning agent uses two kinds of auxiliary resin [HMF resin (49Pg formaldehyde/g fabric) and MF resin (3Wg formaldehyde/g fabric)] and four kinds of adhesives (acrylic acid, acrylonitrile-Jadiene, styrene one) J Diene, Vinyl Acetate) The paint printing paste was applied to a cotton knit fabric to evaluate the ability of the hydrolyzed soy protein scavenger and urea scavenger to reduce the amount of formaldehyde emitted. The hydrolyzed soy protein scavenger absorbs more than three times as much formaldehyde as the urea scavenger and is used industrially as a formaldehyde scavenger. i was translated from the US “textile chemist and dyerâ€.
Effect of Catalyst on Cotton Reducing Dyed Fabric in Polycarboxylic Acid Finishing In order to obtain a non-ironing and wrinkle-free fabric, the vat dye-dyed cotton fabric was finished with BTCA (X-alkyltetracarboxylic acid) or citric acid. A mixture of sodium trisodium citrate (TSC) sodium hypophosphite (SHP) or sodium oxalate and sodium formate is used as a catalyst, and the results obtained by various finishing systems are compared with the DMDHEU (dimethylol dihydroxyethylene urea) system. The colorimetric results of the BTCA/TSC system and the DMDHEU crosslinker were found to be similar. TSC can replace the SHP catalyst, but there is not much change in functionality.
Excerpted from the US "Textile Chemist and Dyeing Home"
Chitosan is used for antistatic finishing of polyester fabrics. Polyester fabrics are electrostatically charged. In order to carry out antistatic finishing on them, many studies have been carried out. Due to the functional hydroxyl groups on the polyester fibers, a catalyst can be used to aggregate them and shells. The amino group on the sugar is crosslinked to achieve the purpose of antistatic finishing. We found that the cross-linked polyester fabric electrostatic voltage can be reduced to less than 1A0 of untreated polyester fabric. The tensile strength of the fabric after baking is large due to cross-linking with chitosan, but the weight loss caused by alkali treatment. This increase in tensile strength is not sufficient to compensate for the strength loss caused by alkali hydrolysis.
Excerpted from the US "Textile Chemist and Dyeing Home"
Evaluation of the degree of crosslinking of polycarboxylic acids on cotton fabrics by acid-base titration 23.4. Polycarboxylic acids such as butane tetracarboxylic acid (BTCA) as a formaldehyde-free durable setting (DP) finishing agent to replace the traditional N-hydroxyl The base agent has received attention, and it can be considered that the smooth appearance of the fabric is produced by crosslinking of a polycarboxylic acid and a cotton cellulose ester.
The concentration of the ester and free polycarboxylic acid is determined by acid-base titration to determine the degree of ester crosslinking. Since the wrinkle recovery of the treated fabric is directly related to the ester concentration on the fabric, it is understood that the ester concentration determined by the titration method can be used as a basis for evaluating the cross-linking effect on the DP-finished cotton fabric.
The sample is a cotton printed fabric that is scoured and bleached. It was padded in a treatment solution consisting of BTCA and sodium hypophosphite, and dried at 85 C for 5 minutes and then baked.
The amount of carboxylic acid on the BTCA treated cotton fabric before baking (A) the amount of carboxylic acid after baking (B) ester concentration (AB) and free carboxylic acid concentration (C) were obtained, as the baking temperature was observed. Improve, (AB) plus, C lower translation from the British "Textile Society"
Electron beam irradiation was used to irradiate silk with electron beam irradiation technique. The graft polymerization of hydroxyethyl methacrylate (HEMA) on silk fabrics was studied by two electron beam irradiation processes (pre-irradiation process and post-irradiation process). The fabric was treated with HEMA before electron beam irradiation)), and various factors affecting the grafting rate were examined. The physical and mechanical properties of the silk fabric after electron beam irradiation grafting, such as the breaking strength and the electron beam for resilience, were examined. Irradiation of silk fabric grafted with hydroxyethyl methacrylate, its weight added, and improved anti-wrinkle electron spin resonance detection showed that free radical products were produced on the electron beam irradiated silk fabric and quickly in water disappear.
Xie Gusheng was translated from the British "Stainers Association"
Improving the light fastness of natural dyes on protein fibers with UV absorber post-treatment. The effect of UV absorbers on the light fastness of natural dyes has been studied. Wool and silk dyed with natural dyes with and without mordants. Post-treatment with two UV absorbers improves the light fastness of mordant fabrics without affecting the hue of the dye. The color difference DE of the dyed sample was measured before the irradiation of the xenon arc lamp and after 20 hours of irradiation, and the light fading degree of the wool absorbed by the ultraviolet absorbing agent was much higher than that of the silk.
Excerpted from the British "Stainers Association" 2001, (3) pH control of polyamide fibers dyed with acid dyes In this study, we reported many pH control systems for dyeing polyamide fibers in closed dyeing operations. The control system consists of a phosphate buffer system and four pH slip systems (ammonium sulfate and three hydrolyzable organic esters). The pH control ability of these pH buffer systems is compared with their dyeability and sodium dihydrogen phosphate and sulfuric acid. In the ammonium comparison, the hydrolyzable organic ester exhibited an extremely effective pH slip, thereby exhibiting a higher dyebath exhaustion and color yield. However, a stain test was observed between the five acid donors studied. There is no difference in the levelness of the samples, and the color fastness of the dyed fabrics is not different in various pH control systems. Excerpted from the British "Stainers Association" 2001, (3) Polyethylene terephthalate Dyeing performance in supercritical carbon dioxide Using a high-speed spinning technique, a new type of polyethylene terephthalate fiber was developed to dye the new fiber in critical carbon dioxide dyeing. The fiber dyeing performance of the conventionally produced fiber is compared at a lower temperature and pressure. This high-speed spinning new fiber has an inherently large crystal size and a low birefringence, exhibiting a large dye absorption. When the supercritical conditions were raised to 125 C and 230 bar, the dye absorption of the two types of fibers was significantly greater, and the difference in dye absorption between them was reduced. In the sublimation fastness test, this new type of fiber exhibits a slightly higher level of excerpt from the British "Dyeing Association Association* 2001, (5) (continued on page 37). The values ​​are also better than chitosan treatment. The post-baked fabric is high. The surface of the chitosan-treated polyester fabric is also rougher and the silkiness is also worse. These comprehensive results show that the chitosan treatment will damage the polyester fabric and require soft finishing. Conclusion With the increase of alkali concentration, the weight loss of polyester material is also increased, but the weight loss of polyester fabric caused by alkali treatment is not related to the absorption of chitosan by fiber. The absorption rate of chitosan is 3.2%~6.16. The residual rate of chitosan on polyester fabric after washing in the range of 7% is in the range of 273%~3.45%. It is confirmed that the cross-linking of malonic acid can form a stable chemical bond baking between chitosan and polyester fiber. The tensile strength of the polyester fabric is improved by the cross-linking of chitosan. However, under the weight loss caused by alkali treatment, the tensile strength of the fabric increased by chitosan cross-linking is not enough to compensate for the fabric pull caused by alkali hydrolysis. Loss of tensile strength, chitosan treatment The polyester fabric feels worse after that, but since the static voltage of the treated fabric is lowered to 1A0 of the untreated fabric, it is considered that chitosan is effective for antistatic finishing of the polyester fabric.
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