Alkali pretreatment and resin finishing of lyocell: Effect of sodium hydroxide pretreatments

Kongdee, Arunee; Manian, Avinash P.; Lenninger, Margit; Schlangen, Joerg; Bechtold, Thomas

doi:10.1002/app.31367

Cited by 7 publications

(4 citation statements)

References 26 publications

(33 reference statements)

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“…the effect of NaOH pretreatments on crosslinking with the three agents, has been reported on previously (Kongdee et al 2010). Here, we present the remainder of the results.…”

Section: Introductionsupporting

confidence: 51%

Alkali pretreatments and crosslinking of lyocell fabrics

et al. 2017

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Lyocell fabrics were pretreated with NaOH, KOH and LiOH and subsequently crosslinked with three urea-formaldehyde based crosslinkers DMDHEU, DMeDHEU and DMU. The mechanical properties varied with the alkali concentration in fabrics crosslinked after pretreatment with 2-8 mol/l NaOH and 4 mol/l LiOH. In fabrics crosslinked after pretreatment with 2-8 mol/l KOH and 1-3 mol/l LiOH, in contrast, the mechanical properties were relatively insensitive to the alkali concentration. The difference in effects is attributed to the alkali influence on the accessibility of crosslinker in fiber structures. The NaOH and 4 mol/l LiOH pretreatments increase the accessibility of crosslinker but the KOH and 1-3 mol/l LiOH pretreatments do not appear to change accessibilities to the same extent. The results underscore the importance of alkali choice and process control in the pretreatments of lyocell. Both NaOH and KOH may be used to good effect. However, lyocell is more sensitive to changes of alkali concentration in NaOH treatments as compared to KOH pretreatments. Thus, the use of NaOH in pretreatments of lyocell will require a greater degree of monitoring and control of alkali concentrations as compared to when KOH is used.

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“…the effect of NaOH pretreatments on crosslinking with the three agents, has been reported on previously (Kongdee et al 2010). Here, we present the remainder of the results.…”

Section: Introductionsupporting

confidence: 51%

Alkali pretreatments and crosslinking of lyocell fabrics

et al. 2017

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“…Introduction of amino group in CS and HF in cotton fabric resulted in increased positive charge on cotton fabric surface under acidic dyeing condition, therefore increase in anionic acid dye uptake. However, further increase in volumes of HF solution from 0.24 to 0.40 %w/v might lead to over crosslinking which reduce dye accessibility as found in cellulosic fabrics crosslinked with methylol resin [21]. With the dyeing of anionic acid dye, greater values of color depth were found in the samples treated by CS and HF.…”

Section: Color Depth Of Unfinished and Finished Cotton Fabricsmentioning

confidence: 98%

Chemical Modification of Cotton Fabric Using Chitosan and Hydrolyzed Silk Fibroin

Clongkarn¹,

Aldred²

2020

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A cotton fabric modified with chitosan (CS) and hydrolyzed fibroin (HF) was prepared by using glyoxal as crosslinker. Fixation of CS and HF on cotton fabric was confirmed by Scanning electron microscopy (SEM) and Fourier transform infrared spectrometer (FTIR) and color depth (K/S) of finished fabrics which was dyed with acid dye. %Water absorption, tensile strength as well as %elongation and crease recovery angle were evaluated. Results of SEM micrograph and FTIR spectra clearly confirmed fixation of CS and HF on cotton fabric surface by using glyoxal as crosslinker. %Water absorption and %elongation of the finished fabrics increased with increased concentration of HF in finishing solution. However, decreases in tensile strength and %crease recovery were observed when increased concentration of HF was used. This work demonstrated that the surface properties of cotton fabrics was changed by HF modification, fixation of CS and HF placed onto cotton fabric changed the fabric surface properties, which facilitated more uptake of chemicals such as water and anionic acid dye. The cotton fabrics finished with HF exhibited antibacterial activity against the growth of S.aureus and E.coli which facilitated the finished cotton fabric as a functional materials, for example in a medical application.

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“…By treating the fabrics with either aqueous NaOH or KOH solutions, the cellulose hydroxyl groups get partially deprotonated and the fibers swell due to anionic repulsion between the chains . Thus, the DCRAs depend on the degree of swelling during the crosslinking process and are significantly increased if pretreatments are applied …”

Section: Introductionmentioning

confidence: 99%

Formaldehyde‐free curing of cotton cellulose fabrics in anhydrous media

Mommer

Kurniadi

Keul

et al. 2019

J of Applied Polymer Sci

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The effect of formaldehyde-free curing on standard cotton cellulose fabrics in anhydrous media is studied. Different crosslinkers are applied via (1) a pad-cure-dry process (solid/liquid) and (2) in a vapor chamber (solid/gas). The performance of each crosslinker and set of conditions is assessed by measuring dry crease recovery angles, DCRAs. We find that in control samples (treatment without crosslinker) the DCRAs are altered depending on the solvent. Using DMF, carbonyldiimidazole shows the best DCRA (160.1 , 15 higher than the non-treated fabrics). In ethyl acetate, triglycidyl isocyanurate shows the highest DCRA (22 higher than the control). The most promising crosslinkers are applied with selected catalysts known from literature. Here, trigycidyl isocyanurate in combination with the superbase P4-t-Bu gives the best DCRA (35 higher than the control). Using the vapor-chemical finishing, divinylsulfone as crosslinker increases the DCRA to 162.7 (18 higher than non-treated fabrics). Hence, cotton cellulose fabrics can be successfully finished in anhydrous conditions.

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Alkali pretreatment and resin finishing of lyocell: Effect of sodium hydroxide pretreatments

Cited by 7 publications

References 26 publications

Alkali pretreatments and crosslinking of lyocell fabrics

Alkali pretreatments and crosslinking of lyocell fabrics

Chemical Modification of Cotton Fabric Using Chitosan and Hydrolyzed Silk Fibroin

Formaldehyde‐free curing of cotton cellulose fabrics in anhydrous media

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