Thermal Material: Traditional Upgrade Function Is Stable

The R&D space of thermal insulation materials is also very large, not only to achieve breakthroughs in new fields, but also to achieve upgrading in the original fields. For example, realize the replacement of down. Last year, Yizhen cashmere products produced by Jiangsu Yizheng chemical fiber were officially launched on the market. Yizhen Rong product is a new type of pearl cotton product proposed by downstream users, led by the Synthetic Fiber Department of Chemical Sales East China Branch, and jointly developed by Yizheng Chemical Fiber and Changshu Jinyu. It is mainly used for filling high-end clothing and toys. The pearl beads processed by special production technology are full, soft and smooth, and the quality is far better than ordinary pearl cotton products. After filling, the product has good dispersibility, better rebound and warmth retention effect, and to a certain extent, it has reached the hand feel and replacement effect of natural down. The added value of this product is high, and the price per ton is thousands of yuan higher than that of similar hollow products of Yizheng Chemical Fiber Company.

　　 Infrared regenerative fiber It is also a good material for making warm textiles. Infrared thermal storage fiber mainly uses it to absorb sunlight, light and human body's own life hot wire in the environment at any time for thermal storage, so as to achieve the purpose of keeping warm. Therefore, infrared thermal storage can keep warm for a long time without the feeling of hot and cold, which is very suitable for making warm clothing 。

Corresponding to this is hygroscopic heating fiber. The main principle of this kind of fiber is to absorb water vapor in the gaseous state and make it become liquid, so as to convert its kinetic energy into heat energy Textile Heat is generated, but when the fabric is saturated with moisture absorption, the water in the liquid state will become vaporized in the gas state, and heat absorption is required to cool the fabric. Therefore, hygroscopic heating itself is not a long-term heating process. In the specific process of spinning, weaving, dyeing and finishing, attention should be paid to the damage of phase change materials (microcapsules) of hygroscopic and heat generating fibers, and the temperature, time and times of dyeing and finishing should be reduced as far as possible, otherwise the damage of phase change materials will be caused. In addition, hygroscopic and heat generating fabrics are not easy to store for a long time, and the number of phase change times of hygroscopic and evaporation should be reduced in use to reduce the damage of phase change materials.

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The main component of superfine fiber is polyamide fiber. According to data, the composition and structure of polyamide fiber is simpler than that of protein fiber, and only at the end of the molecular chain can there be carboxyl and amino groups. In the middle of the molecular chain, there are a large number of carbon chains and amide groups, without side chains. Therefore, according to the structure of polyamide fiber, the production process should first use acid hydrolysis and enzymatic hydrolysis technology to chemically modify the ultra-fine fiber, open its amide bond, increase its active group, and then use the retanning, filling, fatliquoring and dyeing technology of natural leather to fill the macromolecular tanning agent between the ultra-fine fibers, Improve its water vapor permeability and other physical properties, so as to make the superfine fiber substrate close to the handle of the leather body.

As a new processing method of synthetic leather, it is feasible to introduce wet processing and finishing technology of leather into the production of ultra-fine fiber synthetic leather. However, with the improvement of superfine fiber processing technology, it is necessary to fundamentally improve the manufacturing process of superfine fiber base cloth, so that the physical properties and feel of the superfine fiber base cloth itself are close to those of natural leather. It should be a direction not to use leather chemicals for wet processing of superfine fiber base cloth, but only to carry out imitation leather finishing. In particular, the development of microfiber synthetic leather must be combined with leather making, dyeing and finishing, shoe making and furniture processing to form a coordinated process and improve the overall development capability. Only in this way can the vitality of microfiber synthetic leather be improved.

The superfine fiber has the following four different production processes: blend fiber (indefinite island fiber): the advantage is that it is easy to produce extremely fine fiber, but the disadvantage is that it needs solvent to dissolve the fiber, and the dissolved "sea" part of PS will be lost, and the proportion of "sea" is high, and the proportion of polyurethane (PU) used in leather making is also high. Island fiber: the advantage is that the linear density of the fiber is uniform, but if it is PET/PS component, it also needs to be treated with solvent; If it is a PA/CoPET component, part of the CoPET in "sea" will also be lost. Direct spinning: no pollution, no loss, PET can be recycled. Polyester polyamide composite: The artificial leather retains two components, which are pollution-free, but it is difficult to split the two components perfectly. Due to color fastness, it is not suitable for suede; Due to the presence of PA, it is not suitable for industrial applications.

According to the quality of artificial leather, products can be classified as follows: high-end artificial suede: Japanese manufacturers monopolize the market, which is a high-end product used in clothing, household and automobile industries; Artificial suede: mainly produced in South Korea and Taiwan, China, with nylon island fiber, used for shoes and bags; Artificial smooth leather: produced with ultra-fine nylon island fiber, used for shoes and bags; Ordinary smooth leather: produced with ordinary polyester or nylon, mainly used in shoes and bags; Woven suede: it is not artificial leather and its price is low.