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20% wool production of fire-retardant fabric feasible
â–¡ Chair: Liang Feng Guest: General Shi Junmei, Research Institute of Equipment, Dr. Shi Linwu on October 15 held in Wuxi, the 30th annual meeting of the National Assembly, the General Post-Army Equipment Institute Shih Ming-wu on the flame-retardant fabric R & D has caused the concern of many wool textile enterprises. Reporter learned in the interview, because the flame retardant fiber both at home and abroad are high price of high-end varieties, low-end varieties of low intensity and even smoke toxic, hot-melt fiber flame retardant processing can achieve flame retardant, but there are still droplet and Other issues , Leading to high-end flame retardant fabrics difficult to promote because of the price, low-end product protection effect is not ideal phenomenon. In the expectation of high-performance, low-cost flame-retardant fiber industrial varieties at the same time, the use of multi-fiber approach with the use of the establishment of synergies, access to high performance and relatively low cost effective way. In addition, long-term fire-retardant fabrics are in the form of tooling fabrics appear, feel hard style is not stylish, not suitable for middle management and senior blue-collar business requirements. Wool fiber is the most non-combustible natural fiber varieties, a reasonable mix of part of the wool fiber, you can get a good flame retardant properties, but also to the flame retardant fabric provides a good hair style, and reduce the cost of the fabric. For wool textile enterprises, this product has certain needs in foreign countries, and the domestic market is also breeding and growing. In the above context, the reporter and Dr. Shi Ningwu launched a dialogue. Hair type flame retardant fabric both function and comfort Moderator: In today's society respect for the value of life, mankind always do everything possible to reduce the occurrence of disasters. Fire will engulf many precious lives. Therefore, all countries have formulated flame retardant standards and safety standards to varying degrees. As a flame-retardant fabric, the market mainly cotton-based fabrics. In your opinion, hair-type flame-retardant fabric compared with the cotton type, how much market space, selling point where? Shi Linwu: Flame retardant fabric divided from the major categories can be divided into two categories. One is through the flame retardant finishing fabric finishing fabric obtained flame retardant fabric. The other is based on flame-retardant fiber as the main raw material, the textile dyeing and finishing process to get flame retardant fabric. Of course, you can also use some of the flame retardant fiber and another part of ordinary fiber fabric, then do flame retardant finishing, but at least for the flame retardant fiber there is unnecessary duplication of processing, will cause waste or even damage the fiber, it is generally not done . Finishing flame retardant fabrics, because of their limited number of washable wash, the touch is usually a bit poor, low strength, especially low tear strength and other issues, usually not as a high-end products. As cotton and polyester-cotton products have more mature flame-retardant processing technology, and the lower cost of the fabric, so the flame-retardant cotton fabric is the mainstream of flame retardant products, as decorative textiles, widely used in mines, hair dryers and public places Wall coverings and other fields, there are still some as a relatively low-end tooling fabrics. It should be said that the number of cotton-based flame retardant fabric is the main market. However, there are some occasions, you need more high-end flame retardant products. For example, the requirements of the flame retardant wear, flame retardant performance, strength, appearance and feel good style, this time should be based on the flame retardant fibers, and use part of the wool fibers to optimize the feel and comfort of hair type resistance Burning fabric. As part of the use of wool fiber, you can use the wool itself is not easy to burn, hygroscopicity and comfort, good flexibility to improve the grade of flame-retardant fabrics, changing the traditional pattern of low-grade flame-retardant fabrics, the protective clothing also has a very Good appearance and comfort. Two categories of fibers constitute the flame retardant Host: made of wool flame-retardant fabrics, in addition to wool, what fibers are needed, can be made both with a haberdashery of comfortable wear, but also has excellent flame retardant properties? Shi Linwu: Although the specific proportion of fiber blending according to the user's flame retardant index, price positioning and other factors to determine, but in principle is: the first category should be good with good fire retardant properties of the fiber to provide basic Retardant properties and complete performance after combustion film formation, this fiber can be made from the domestic meta-aramid, domestic polysulfonamide, domestic poly-aryloxadiazole fiber (Po Tak Lun) and other varieties selected, which Po Tak-Lun have Better dyeing performance, higher decomposition temperature, and the price is cheaper. The second type of fiber should be used to reduce costs and improve the comfort of the fabric, the most typical is made of flame-retardant viscose fiber, cheaper. However, the flame-retardant adhesive strength is not high, if the user needs fabric with high strength, you can add some high-strength flame retardant vinylon, the strength of up to 7.5cN / dtex, can alleviate the problem of low fire-retardant adhesive strength. For wool, you can use 20% to 30% of the fiber ratio, still can maintain a good flame retardant properties. Experiments show that similar systems using 25% non-flame-retardant finishing of ordinary wool, fabric burning and smoldering time can also be kept for 0 seconds. Because these fibers have different flame-retardant mechanisms, the synergistic effect under different flame-retarding mechanisms can be produced jointly to achieve a good flame-retardant effect. And because the second type of fiber is much cheaper than the first type of fiber, the final product is cost effective. Moderator: wool and flame-retardant fibers through what process, so that the formation of flame retardant together? Shih-Lin Shi: Wool fibers and other fiber mix, in the textile processing, you can use the general ring spinning, Siro spinning, compact spinning and other blended methods, no special requirements. We are also studying the yarn structure of different components in different locations, but there is no clear difference at present. The formation of a good flame retardant properties of the final fabric depends mainly on the collocation of different flame retardant mechanisms of these fibers. Some of the modified flame-retardant fibers release non-flammable gases by heating, play the role of shielding combustible gases and isolating oxygen, and some of them play a role of insulating or inhibiting the combustion reaction after burning, and some of the fibers themselves do not burn and are formed by carbonization skeleton. If these different flame-retardant mechanism to achieve a good match, you can use a lower price of flame-retardant fibers and some ordinary fiber conditions, to achieve a good flame retardant effect. More than 20% wool can achieve the desired effect Moderator: How much wool proportion, can produce the flame retardant effect of the ideal fabric? Shih Lin Wu: For general textiles, wool is more expensive fiber raw materials. But for flame-retardant textiles, high-performance flame retardant fiber is far more expensive than wool, especially as a fire retardant clothing, will not use very thin wool to make a very thin fabric, but used to do Thickness of the fabric wool is usually conventional fineness, its price is about expensive than some domestic flame-retardant adhesive, but than the domestic meta-aramid, polysulfonamide and other cheaper. Therefore, the purpose of using wool is to reduce the cost of flame retardant fabrics. If you want to use more wool in order to reduce costs, wool can account for about 30% of the final product will have a good wool fabric feel, and flame retardant in the high-end; if it is the pursuit of better security, requires a High flame retardancy, you can use 20% of the wool. Moderator: In the domestic and foreign markets, to achieve what relevant standards, can be called fire-retardant fabric? Shi Linwu: At present, the standard of flame-retardant fabrics in China is GB / T, which includes fabrics for different purposes, such as decorative fabrics, interior fabric of vehicles such as aircraft / car / ship, fabrics for flame-retardant protection . Flame retardant protective clothing, flame retardant performance requirements are continued burning and smoldering time are not more than 5 seconds, the damage is not greater than 15 cm in length, there is no melt dripping phenomenon. This fabric reached the requirements of flame retardant fabric, it can be considered flame retardant fabric. China's protective clothing (flame retardant clothing) standard GB8965.1-2009 fabric flame retardant properties are divided into A, B, C third gear, A-level requirements continued burning and smoldering time are less than 2 seconds, the damage is not more than 5 cm in length Class B requirements continued burning and smoldering time are less than 2 seconds, the damage length of not more than 10 cm; C-level requirements continued burning and smoldering time are less than 5 seconds, the loss of length of not more than 15 cm. 3 levels are not allowed to melt drip; A-level flame retardant fabric thermal protection coefficient requirements. Many foreign standards, there are more stringent, according to the use of other more close to the actual use of state-specific test methods. However, in general, it is similar to the flame retardant requirements listed in the standards of flame retardant protective clothing. Compared with the high-end products cost savings of 15,000 yuan Moderator: Production of wool flame-retardant fabrics, the cost will change? Shih-Mei Wu: For the production of low-grade flame retardant products, add wool is not suitable for high-grade flame retardant products, such as the original use of meta-aramid 93%, 5% of aramid fiber, short conductive staple 2% of the typical formula, The price of meta-aramid is about 130,000 yuan / ton, a decrease of 20% meta-aramid and the price of 58 to 60 pieces of Australian wool self-sliver with the price about 50,000 yuan to 60,000 yuan per ton, Each ton can save 15,000 yuan or more. If it is aramid 50%, 50% flame retardant adhesive formulations, equivalent to about 20% of the meta-aramid can be used with the price of flame-retardant viscose similar ordinary wool to replace the fiber cost can also be saved Tons 15,000 yuan. Of course, the specific formula according to the user's specific performance requirements to design.