What are the weight gain methods for making silk with hydroxymethacrylamide

Silk pigment weight gain is made from natural silk (from the waste and scrap silk produced in the silk weaving process), and the silk pigment is fixed by ethanolic tin chloride method and glutaraldehyde method. Among them, the molecular chain of filament molecule is short, and the polypeptide chain with small molecular weight can penetrate into the silk better. These filament molecules have certain fixation effect, which can prevent silk fabrics from shrinking due to swelling after washing, reduce the shrinkage of silk, and improve the stiffness and wrinkle resistance of silk after the weight gain of filament. What are the weight gain methods of ➔ Hydroxymethacrylamide‍?

1. Plant weight gain

Among them, natural tannins are mainly adsorbed, and the volume of silk fibers increases after tannin weight gain, which improves the feel, elasticity and drapability of silk. Tannin, also known as tannic acid, is a natural substance extracted from the pentaphyllum plant. Tannin weight gain is achieved by immersing the silk in tannic acid solution and decocting it for a certain period of time, so that the tannin is adsorbed on the silk, and then adding tartar powder to fix it, so that the tannin is adsorbed and deposited on the silk, thus improving the quality of the silk. The weight gain effect is mainly related to two factors: the number of chemical bonds formed between silk and tannin activation centers and the stability of these bonds. The reaction mechanism of tannic acid weight-added silk: the hydroxyl group of tannic acid reacts with the imine group of the peptide bond of silk protein to form a hydrogen bond. For example, tannin weighting treatment can improve the drapability, strength, wrinkle resistance and thickness of silk. The dyeing performance of weighted silk cationic dyes is improved and color fastness is better, and the weighted silk can be dyed with metal salts.

2. Mineral weight gain

Mineral weight gain is a traditional weight gain process, mainly using tin salts, aluminum salts, zinc salts, etc. First, tin is used for weight gain. Because of its good hardness, weight-added silk is often used to weave embroidery, kimono ribbons and heavy style women's clothing. In general, tin tetrachloride molecules are diffused in an aqueous solution into the expanded silk fibers for hydrolysis reactions. Traditional silk glue weight gain techniques no longer meet environmental requirements. For example, the aldehyde or aldehyde derivatives produced during weight gain can be harmful to human health; with heavy metal chromate fixed silk glue, the real ribbon is blue after weight gain.

Therefore, some companies use rare earth metal ions as silk glue fixing agent to increase the weight of silk. After the intervention of hydroxymethylacrylamide ‍, a better weight gain effect can be obtained. Modern silk weight gain technology is mainly based on chemical graft copolymerization technology. The reaction mechanism of chemical grafting weight gain is that under the action of initiator, silk fibers and olefin monomers produce reactive radicals, then free radical polymerization occurs, and the branched chains composed of olefin monomers are attached to the silk protein molecular chains, thus increasing the weight of silk and improving some properties of silk.