Assessment of Fabric Performance Versus Reagent Location from Lick Roller Application of DMDHEU

Abstract

The balance of textile performance properties and the distribution of crosslinking reagent residues throughout fabric were studied in relation to lick roller application of DMDHEU. Features of the lick roller treated fabric were compared to the conventional pad(immersion)-dry-cure product and to a corresponding product designed to have a high degree of uniformity of reagent residue distribution throughout the thickness of the fabric by minimizing migration. A special Osnaburg-fabric was used to facilitate several aspects of the study including the measurement of distribution of reagent residues. The fabric treated to a high degree of uniformity of reagent residue distribution exhibited substantially higher abrasion resistance than the conventional product when compared at equal levels of durable press appearance rating; it was slightly lower in strength properties. The product from lick roller treatment at optimum liquor pickup approached the high uniformity standard in uniformity of reagent residue distribution throughout the fabric thickness and in abrasion resistance. In breaking strength, tearing strength, and elongation (especially in the warp), this product from lick roller treatment performed close to the high uniformity standard. The performance of another product from lick roller treatment that involved lower liquor pickup is also described, Performance properties and distributions of reagent residues are discussed in detail.

Alkali pretreatments and crosslinking of lyocell fabrics

“…The principle of the negative staining test is that in crosslinked cellulosics, the Direct Red 81 dye content is inversely proportional to the crosslinker content; and for the same dye content, the color depth varies with crosslinker distribution (De Boer 1980;Rowland et al 1983). A low color depth indicates a greater surface presence of crosslinker and a high color depth indicates a low surface presence of crosslinker.…”

“…For the same crosslinker content, the crease recovery is greater if there is a uniform distribution of crosslinks through the fiber bulk than if the crosslinks are localized at the fiber surface (Joarder et al 1969;Grant et al 1968;Bertoniere et al 1981). But, a uniform distribution of crosslinks also tends to reduce tensile strength while preserving abrasion resistance, and a greater surface localization of crosslinks preserves the tensile strength but reduces the abrasion resistance (Bertoniere et al 1981;Rowland et al 1983). As seen in the results above, the crease recovery and strength loss in the crosslinked pieces varied significantly with the alkali type and its concentration in pretreatment.…”

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

“…A higher surface concentration of the crosslinker leads to reduced abrasion resistance but preserves tenacity, whereas greater penetration leading to a more uniform distribution of the crosslinker through the fabric structure preserves abrasion resistance but reduces tenacity. 20,26 The amounts of MgCl 2 used as a catalyst in the resin finishing treatments ranged from 12.6 to 32.7 g/L, but there were generally no differences in the work of rupture between the resin-finished sets. There were also no differences in the abrasion resistance between the no-resin, DMeDHEU, and DMU sets among samples from control pretreatments.…”

“…Direct Red 81, the dye content and color depth in substrates are functions of the crosslinker content and distribution. 26,28 The dye content is inversely proportional to the crosslinker content, and the color depth is inversely proportional to the surface concentration of the crosslinker in the substrates. The uptake of C.I.…”

The influence of alkali pretreatments in lyocell resin finishing—Resin distribution and mechanical properties

“…Direct Red 81, dye content and color depth in substrate are functions of its resin content and distribution. 15,16 The dye content is inversely proportional to resin content and the color depth is inversely proportional to the surface concentration of resin in samples. The degree of C.I.…”