1. N-hydroxy-methyl Amide Anti Creasing Agent
The representative products of N-hydroxy-methyl amide anti creasing agent are two hydroxy methyl-dihydroxy cyclic ethyl urea (2D) and Trimethylamine Melamine (TMM). They are the additive products of two hydroxy cyclic ethyl urea, melamine and formaldehyde respectively.
Types of Anti-wrinkle Finishing agents
Mechanism: On the fabric of N-hydroxy-methyl amide resin anti creasing agent treatment, baking process will occur in two aspects of the reaction: first, in the amorphous region of the fiber it can form a network of fibers inside the resin, the relative sliding of the fiber macromolecule or the basic structure unit is changed, and the crease resistance of the fabric is given; the second is that the anti creasing agent and the fiber macromolecules form covalent crosslinking, thus reducing the deformation of the fiber in the process of deformation due to the hydrogen bond folding.
Features: N-hydroxy-methyl amide anti creasing agent has the advantages of durable anti-wrinkle effect, low price and mature technology, and is widely used in crease-resistant finishing of cellulose fiber. However, due to the strong damage of fabric, it has some disadvantages of chlorine absorption, formaldehyde release and other deficiencies
2. Carboxylic Acids Compounds
Action mechanism: The carboxylic acid compound can be esterified with the hydroxyl group on the cellulose Macromolecule, and its crease-resistance mechanism belongs to covalent crosslinking mechanism. It is generally believed that under the condition of the catalyst, the polycarboxylic acid is dehydrated into anhydride first, and then the hydroxyl group on the fiber is esterified crosslinking. there is still controversy and disagreement on the role that the catalyst in the system is mainly to catalyze the multicomponent acid dehydration to anhydride, or focus on catalytic anhydride and cellulose esterification crosslinking, or both catalytic anhydride and catalytic ester,
Type of anti creasing agent: The carboxylic acid molecule with more than three adjacent carboxyl groups can occur two times ester crosslinking reaction with hydroxyl group on the fibrous macromolecules, in order to reduce the deformation of the fiber in the process of deformation, and to improve the ability of the fiber to recover from the deformation, the two macromolecular chains are connected, thus the aim of crease resistance can be achieved.
Butane carboxylic acid (BTCA), citric acid (CA), poly (maleic acid) and polycarboxylic acids are used as anti-wrinkle anti creasing agent.
3. Epoxy Compound Anti Creasing Agent
Action mechanism: Epoxy compound has a high tension of ternary ring, its key angle is distorted, and c-o key angle is very easy to open the ring, showing great liveliness, easy reacting with the active hydrogen oh,-and other groups of the fiber molecules. The molecular structure of two or more than two epoxy compounds with the fiber can occur two or more than cross-linking reaction, making the fabric to obtain anti-wrinkle effect.
Features: More used in the crease-resistant finishing of silk fabrics, which can improve the moisture elasticity of the fabric. After finishing, the fabric does not have formaldehyde release, non-toxic, harmless to the human body, and the yellowing is very low, also with good washing resistance. Easy to gather, storage and the period is short.
Product: Epoxy resin anti creasing agent is mainly epichlorohydrin and polyol condensation. The commonly used polyols are ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, propylene glycol, 1, 4-butadiene alcohol, pentaerythritol, sls sugar alcohol, new glutaraldehyde, hexyl alcohol and so on.
Glycol diglycidyl ether
Propylene glycol diglycidyl ether
4. Other Anti-wrinkle Anti Creasing Agent
Two aldehyde and glutaraldehyde, such as two-element aldehyde compound, can be cross-linked with cellulose fiber, which produces anti-wrinkle effect. Reaction-type silicone compounds with active groups such as silicon-based, vinyl, sulfhydryl, epoxy, amino, and so on. The effect of crease-proof finishing can be achieved by two aspects. The first is the low molecular organic silicon shrinkage body into the fiber, using the active functional groups and fiber molecules of the active group of the organic silicon molecules to cross-link; the second is the high polymer silicone on the surface of the fiber to form a highly elastic molecular membrane, thereby improving the fabric wrinkle recovery performance.
The water-soluble polyurethane has the thermal reactivity, so when treat it to the fabric, the catalyst in the presence of high-temperature baking can be decomposed by the closure, the formation of isocyanate can be cross-linked, forming a polyurethane elastic film, or with the fiber macromolecules in the hydroxyl and amino reaction, forming a mesh crosslinking structure on the fabric; and some polyurethane resin deposits in the amorphous zone, depending on the friction resistance and hydrogen bond, restrict the relative displacement of the molecule chain or the basic structure unit in the fiber, thus endow the fabric with the crease resistance and elasticity.
Bis-hydroxyethyl Sulfone (abbreviated bhes) can release double ethylene sulfone under alkaline treatment, cross-linked reacting with cellulose and making wrinkle-resistant effect.