Abstract
In this paper, monosaccharide (glucose and fructose), disaccharide (sucrose and trehalose), trisaccharide (raffinose) and tetrasaccharide (stachyose) were selected as the research objects and the glycosyl polyaldehydes and glycosyl polyuronic acid anti-wrinkle finishing agents were prepared via selective oxidation. The anti-wrinkle properties of their finished fabrics were analyzed, the molecular radius, the number of reactive groups, the number of reaction sites and the number of rotatable bonds of the finishing agent were calculated to evaluate its diffusion rate and crosslinking characteristics inside the cellulose. Through molecular simulation, the number of possible conformations of the anti-wrinkle finishing agent with the single cross-linked state was calculated, and the distance between different cross-linking points was measured, and the relationship between the effective cross-linking radius and the anti-wrinkle performance was studied. The results showed that trehalose polyaldehydes, raffinose polyaldehydes, trehalose polyuronic acid, and raffinose polyuronic acid finished fabrics had an excellent anti-wrinkle property, the strength retention rates of the fabrics were all above 68%, and the whiteness index was above 70. The smaller the molecular radius was, the easier the finishing agent was to diffuse into the cellulose. The most suitable crosslinking radius of glycosyl finishing agent was 3.5–6.0 Å.
Highlights
Cotton fabrics are favored by people for their excellent wearing comfort and breathability
The wrinkle recovery angle (WRA) of the treated fabric was increased slightly, because glucose was a reducing monosaccharide, and the aldehyde group of glucose was cross-linked with the hydroxyl group of cellulose under the high temperature, which improved the WRA of the finished fabric
This paper studied the anti-wrinkle performance of glycosyl polyaldehyde finishing agents (OFr, OSu, OTr, ORa, OSt), glycosyl polyuronic acid finishing agents on finished cotton fabrics
Summary
Cotton fabrics are favored by people for their excellent wearing comfort and breathability. Cotton fabrics can cause many inconveniences to people due to wrinkles in washing and daily wear. With the increasing demand for natural fibers, anti-wrinkle finishing has become an important post-finishing process in the dyeing and finishing of cotton fabric [1,2]. Anti-wrinkle finishing agents for cotton fabrics can be divided into the following two categories: formaldehyde finishing agents and formaldehyde-free finishing agents. Formaldehyde finishing agents are mainly N-methylol resin compounds, such as dimethylol dihydroxy ethylene urea (DMDHEU, 2D resin), this type of compound has high reactivity and an excellent cross-linking effect, but the ether bond is easy to hydrolyze and break and releases free formaldehyde, which is harmful to human health [3,4]. The cotton fabrics with these finishing agents have an excellent wrinkle property, but there are problems such as strong damage to and yellowing of the fabric [5,6,7]
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