Analysis Of The Role Of Formaldehyde In Garment Fabrics

< p > < strong > wrinkled pure cotton and non wrinkled chemical fiber < /strong > /p >
< p > the disadvantage of pure cotton < a href= "http://www.91se91.com" > dress > /a > is that it will wrinkle after washing and wear it through ironing. But often ironing clothes is a very annoying thing. In 1936, DuPont Co successfully made silk thread with polyamide resin and made it a silk thread now called nylon line and began to produce stockings and clothing fabrics. In the 60s of last century, polyester fiber (Dacron) was used to produce garment fabrics. The garments made of Dacron fabrics are leveled, and are not afraid of washing and ironing. The cotton planting industry is seriously threatened. < /p >
< p > from 1958 onwards, in order to help the a href= "http://www.91se91.com/news/index_c.asp" > cotton < /a > planting industry to get out of difficulties, the group led by the Southern Research Center of the United States Department of agriculture conducted in-depth research on the structure of cotton fiber. They discovered that the cell walls of plants are made up of multilayered cellulose molecules. The cellulose molecule of cotton is composed of 500~15000 carbohydrates long chain formed by glucose polymerization, and the long chain between cellulose molecules is bonded by hydrogen bonds. Because the hydroxyl group of the hydrogen bond is hydrophilic, the hydrogen bond is opened by the action of water when washing pure cotton clothes, and the location of the long chain between cellulose molecules will move in the process of washing and rubbing. When the clothes washed by water are dried, the hydrogen bonds that are opened in cotton fibers are re formed. However, due to kneading, the location of the long chain of neighboring cellulose molecules has shifted to different degrees. The new hydrogen bond is different from the original hydrogen bond. This is why cotton a href= "http://www.91se91.com/news/index_f.asp" > dress < /a > will wrinkle after washing with water. Only the wet clothes are sprayed with water, because all the hydrogen bonds in the cotton fiber are opened under the action of water, and the long chains of cellulose molecules are re arranged and arranged orderly under the pressure of the iron. When the water is heated and evaporated, a stable hydrogen bond is formed between the long chains of all cellulosic molecules, which is why iron is used to iron the clothes. Since there are no hydroxyl groups and other hydrophilic substituents on the long chain of polyester fibers, there is no slight movement in the location of the long chains between adjacent polymers in the process of washing and rubbing with water. This is the reason why the clothes made of polyester fiber can not be wrinkled by washing with water. < /p >
< p > < strong > formaldehyde can make the clothes remember the shape < /strong > < /p >.
< p > Berne Ray Tor believes that if a stronger chemical bond is used to replace the hydrogen bond between the long chains of cellulose molecules, the possibility of wrinkling will be reduced after washing with water. They found that formaldehyde can make the long chain of cellulose molecules cross connect with formaldehyde in the cotton fiber. The clothes treated with formaldehyde will not wrinkle after washing with water. This is the first time that they developed a non iron technology. Because formaldehyde is a toxic substance, formaldehyde treated clothes not only smell unpleasant, but also make the wearability of the clothes weaken and the color is yellow. Later, they developed a better patent technology, which is to produce a longer bridge chain with the N, N- two ethyl amino ethyl derivative of cotton cellulose and two halogenated alkane. The clothes processed by this technology have the advantages of strong sweat absorption, high permeability and comfortable wearing. < /p >
< p > because of the high cost of converting cotton fiber to N and N- two ethyl amino ethyl cellulose, this excellent iron free technology is only suitable for expensive clothing and household products. In the popular clothing, the manufacturer still uses formaldehyde to carry on ironing treatment. The last step of ironing is to wash. If the washing process is not completed thoroughly, there will be formaldehyde residue on the garment. Therefore, in order to prevent formaldehyde from irritating the skin and causing other health problems, the newly bought ironing clothes should be soaked and washed before being washed with water. < /p >