Existing problems in the application of textile loading in my country

(1) High water consumption

The production of textiles and clothing consumes a lot of water and chemicals, which is a major source of water pollution and toxic chemical emissions around the world. It is estimated that for every kilogram of fabric processed, production needs to consume about 600kg - 1000kg of water, and the amount of dyeing and finishing consumption varies depending on the type of fabric... The cost of common materials in textile enterprises is ranked second to raw materials, saving materials is of great importance.

(2) The discharge of materials seriously pollutes water quality and the environment

According to reports, most of the dyes and chemicals used in textile mills are harmful to the environment after being released into wastewater are discharged Shangzhong is a necessary process in the weaving process of textile factories. 50% of industrial textile wastewater comes from the process of meeringre yarns, and the main component of this part of the industrial wastewater is multi-yarn and multi-material waste, and the COD value of wastewater generated by the topping and debonding of textile mills accounts for 50% - 80% of the COD value of textile waste water\" ^\"\'0 It has been reported that the COD range of starch based slurry is 900mg - 1200mg CVg and the BOD range is 500mg -600mg (Vg, while the COD of PVA storage material is 1700 mg is CVg and the BOD range is 30mg - 80mgCVg.The COD range of the polyacrylate slurry is 1350mg - 1650mg (Vg, BOD range is 50mg Oz/go).The lower the biodegradability of PVA, the worse the iq. The lower BOD value of synthetic materials has always been a concern of the loading industry, because the discharged waste water from the yarn loading will pollute the environment. Researchers have made many attempts to replace biodegradable multi-synthetic materials.< /p>

(3)The biodegradability of PVA and its synthetic materials is poor

The biodegradability of PVA and its synthetic materials is poor. Textile mills all discharge PVA and its chemicals into waste water, which can be toxic after treatment. Research shows that only 60% of PVA is broken down by 4 months of aerobic degradation; through 77 days of anaerobic degradation, only 0-12% of PVA is broken down. The BOD5/COD ratio of PVA is 0.01, indicating that the biodegradability of PVA is very poor. Therefore, textile mills should try to avoid using PVA charging. However, it is cost effective to develop and has the same performance as yarn and biodegradable alternative slurry has been a research problem. Researchers chemically modify starch through grafting and other chemical techniques, making starch suitable for synthetic fibers and their blended fibers. Chemical modificationhowever, not only reduces the biodegradability of starch, but also makes its cost higher than that of PVA material, so the modified starch material is not as popular as PVA material.

(4 ) The types of fiber used applicable to the paddle are limited

—GeneralIn general, starch and its derivatives are used for coating cotton fibers, and PVA slurry is used for coating synthetic fibers and their blends. While starch-based charges are inexpensive, biodegradable and offer good properties for cotton fibers, they are not suitable for synthetic fibers and their blends. Similarly, PVA material can also perform well for synthetic fibers and is easy to extract, but it is not suitable for cotton fibers and is relatively expensive.

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