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Yinchuan, China

Wang S.,Dymatic Chemicals Inc. | Li S.,Dymatic Chemicals Inc. | Zhu Q.,Donghua University | Yang C.Q.,University of Georgia
Industrial and Engineering Chemistry Research | Year: 2014

Exceedingly high temperatures (normally ∼98 °C) are used to perform hydrogen peroxide (H2O2) bleaching of cotton fabrics in textile industrial practice. Such harsh conditions lead to high energy consumptions and high fabric mass loss. In recent years, the industry and academic communities have conducted extensive research to reduce the temperature for industrial cotton bleaching. In this research, we developed a new H 2O2 activator based on amino nitriles. All of the data demonstrated that in the presence of the new H2O2 activator, the combined scouring/bleaching of the knitted cotton fabric could be performed at 60 °C. The cotton knit fabric treated using the low temperature procedure also has lower fabric weight loss; some of the hydrophobic substances were retained on the fiber surface after the process. We found that the residual hydrophobic substances had little effect on the whiteness of the treated fabrics after application of optical brighteners, and had little effect on the shade-depth and colorfastness to washing and rubbing of the treated fabrics after dyeing. The higher was the weight retention, the more value of the treated cotton knitted fabrics was increased. The removal of less substance from cotton also resulted in lower chemical oxygen demand in the wastewater, thus providing additional environmental benefits. Moreover, the low temperature scouring/bleaching procedure had significantly lower energy consumption than the traditional procedure. The possibility and effectiveness of this new technology has been confirmed in our industrial scale trials. The disadvantage of this method was that it required higher quantity of chemicals for the treatment. © 2014 American Chemical Society.

Zhu Q.,Donghua University | Gao Q.,Dymatic Chemicals Inc. | Guo Y.,Dymatic Chemicals Inc. | Yang C.Q.,University of Georgia | Shen L.,Donghua University
Industrial and Engineering Chemistry Research | Year: 2011

The applications of water-resistant and stain-resistant finishes to apparel have become widespread in recent years due to high consumer demand. In our previous research, we studied the formation of highly hydrophobic surfaces on cotton and polyester fabrics using a two-step treatment procedure, i.e., first forming silica sol by hydrolysis and subsequent condensation of tetraethoxysilane under alkaline conditions, applying the sol to the surfaces of cotton and polyester fabrics, and then applying hydrolyzed hexadecyltrimethoxysilane on the treated fabrics to impart hydrophobicity to the surfaces of the fabrics. In this research, we developed a novel one-step procedure to form highly hydrophobic surfaces on cotton and polyester fabrics using different modified silica sols. The first series of modified silica sol ("sol A") was prepared by the reactions of a sol formed by alkaline hydrolysis of tetraethoxysilane and alkyltrialkoxysilanes in a NH 4OH-ethanol solution. A second series ("sol B") was prepared by the reactions of a sol formed by the same method, followed by adding (3-glycidyloxypropyl)trimethoxysilane and alkyltrialkoxysilanes to the sol. The cotton and polyester fabrics treated with the two modified silica sol systems showed excellent water repellency with the water contact angle above 150° on cotton and above 140° on polyester under the optimum treatment conditions. The treated cotton and polyester had significantly improved hydrolysis resistance and maintained high levels of hydrophobicity after 30 laundering cycles. © 2011 American Chemical Society.

Li Y.,Dymatic Chemicals Inc. | Hu Y.,Guangzhou Quality Supervision and Testing Institute | Liu J.,Dymatic Chemicals Inc. | Guo Y.,Dymatic Chemicals Inc. | Wang G.,Dymatic Chemicals Inc.
Chinese Journal of Chromatography (Se Pu) | Year: 2011

A gas chromatography-mass spectrometry (GC-MS) method has been developed for the determination of dibutyltin (DBT), tributyltin (TBT) and triphenyltin (TPhT) in textile auxiliaries. The sample was first extracted with w-hexane in acetate buffer solution (pH 4. 0) under ultrasonication (for hydrophobic sample) or oscillation extraction (for hydrophilic sample) and then derivatized with sodium tetraethylborate in tetrahydrofuran. The derivative was determined by GC-MS in selected ion monitoring (SIM/mode. The separation and quantification were achieved using a Rxi-5ms silica capillary coiumn (30 m ×0.25 mm x 0. 25 μm). The linear ranges were 0. 1 - 8. 0 mg/L for both DBT and TBT, and 0. 1 - 4. 0 mg/L for TPhT. There were good linear relationships between the peak area, and concentration in the linear ranges and the correlation coefficients (r 2) were 0. 999 4-0. 999 8. The detection limits (LOD) were from 0. 003 mg/L to 0. 005 mg/L. The average recoveries of these organotin compounds at the three spiked levels of 4. 0, 10. 0 and 40.0 mg/kg were 92. 6% - 108. 0% with the relative standard deviations (RSDs) of 2. 5% - 10. 2%. The method is simple and accurate for simultaneous analysis of the DBT, TBT and TPhT in textile auxiliaries.

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