High Performance Fiber PTFE Witness The Wisdom Of Chinese People

High performance

Due to the nature of polytetrafluoroethylene, P

According to Dr. Hao Xinmin, a senior engineer of the general military equipment research institute, who participated in the research and development, PTFE is insoluble in any solvent, and the macromolecule chain is arranged in a straight line, with a rigid rigidity and above melting point.

At present, only a few companies in the world have mastered the production technology of PTFE fiber. The main production processes include carrier spinning and paste extrusion. However, these companies have long been technically blocked in China, and the products are expensive, which greatly increases the application cost of PTFE fibers, thus seriously restricting the development and application development of PTFE fibers.

Starting from the analysis of only a few samples of foreign production, a long years of hard exploration and hard work began.

据悉，由企业、科研单位和用户组成的课题组研究设计了PTFE膜裂法长短纤维生产工艺流程，研发了温度梯度控制的非等速、变幅宽、多次拉伸PTFE纤维的生产工艺，研制了高强异型PTFE长纤维和短纤维，解决了PTFE短纤维“併丝”问题;研制了多棱角型膜裂长纤维切刀、耐磨金刚石短纤维分切针辊、牙线膜裂切片成型等关键装置，设计加工了螺旋式挤压机、二辊压延机、非等速拉伸机、梯度温控变幅宽拉伸机、膜裂长纤维分切机、短纤维分切机、纤维挤压牵伸机、卷曲机等系列成套生产设备，并建立了规模化生产线;研发生产了“ひ”形PTFE牙线、高强纯PTFE梯度覆膜过滤材料，所有这些工艺技术、系列产品及生产设备，在国内外未见相似或相同文献报道，具有新颖性和创新性。

The product novelty search further proves that the PTFE fiber produced has filled the domestic blank. The PTFE fiber performance is at the international leading level, and the PTFE fiber application product is in the international advanced, the domestic leading level.

Production capacity of 1000 ton class has been formed.

The expert appraisal committee of this appraisal activity is a strong lineup. The director and deputy director of the appraisal committee are respectively three academicians from Sun Jinliang, Jiang Shicheng and Zhang Yaoming. The 11 well-known experts from the fields of chemical fiber materials, industrial textiles, environmental protection and chemical industry all agree that the project is a major integrated innovation in China's high-performance fiber processing technology, production equipment, product development and other aspects, with demonstration effect, and the overall technology has reached the international advanced level.

In the opinion of experts, experts believe that the project has invented PTFE uniform solid processing and membrane making technology, and the PTFE film and fiber integrated production equipment with independent research and development and integrated innovation have been running steadily, and the production capacity has reached 1000 tons.

The research results have 10 independent intellectual property rights, applied for invention patents, and have authorized 4 items. The social and economic benefits are significant, and the market has broad application prospects.

Ye Yongmao, consultant and senior professor of the China Chemical Fiber Industry Association, told reporters: "the national development and Reform Commission has clearly listed the development and production of PTFE fiber and products in this year's guidance catalogue for industrial restructuring." in the year 12th Five-Year, we can see that the series of fruitful achievements of project completion units is exciting. "

PTFE fiber as an excellent skeleton material, its mass production can promote the application of high performance fiber such as aramid fiber 1313, polysulfonamide fiber and polyphenylene sulfide fiber on filter material. It can accelerate the pformation of China's chemical fiber industry's economic development mode, and promote the restructuring of chemical fiber industry.

Ye Yongmao introduced the production of PTFE fiber by membrane cracking and its application products, mainly including polytetrafluoroethylene long fiber and PTFE short fiber. The products developed by PTFE long fiber include: long fiber yarn, PTFE sewing thread, polytetrafluoroethylene dental floss, polytetrafluoroethylene long fiber reinforced polytetrafluoroethylene network reinforced by chlor alkali engineering, polytetrafluoroethylene fabric produced by PTFE fiber, PTFE film coated needle felt filter material and so on.

The technology of Teflon long and short fiber produced in this project is at the international advanced level. The price of the product is about 35% of the foreign similar products, which greatly reduces the production cost of the domestic users, laying the foundation for the batch application of high-performance PTFE fiber in China's environmental protection.

Ideal material for dedusting filter material

Fang Aimin, director and senior professorship engineer of the dust removal and ash removal Research Institute of Guodian Environmental Protection Research Institute, said: "the breakthrough of domestic PTFE fiber production technology has successfully broken the monopoly and technology blockade of foreign products to us over the years, which will lead to the upgrading of environmental technology and materials. It is of great social significance and important significance in the key stage of the" blue sky project "in 12th Five-Year.

According to Fang Aimin, the important application of PTFE fiber in the project is to prepare PTFE filter material for high temperature corrosive flue gas dedusting.

At present, the domestic PTFE filter has been widely used in waste incineration, coal-fired power plants, steel and other industries. It is one of the key materials for energy saving and emission reduction in China. At the same time, PTFE filter material can also be used in the gas-solid two phase separation field under corrosive high temperature environment as filtration separation material.

At present, there are about more than 40 municipal solid waste incinerators and hazardous solid waste incinerators in China, all of which are made of PTFE long and short fiber products developed by this project. The total filtration area is above about 700000 square meters, and the total amount of PTFE fiber used is about 595.31 tons. In, the total amount of fiber used in our country is about 595.31 tons.

For example, in the whole year of 2009, the PTFE long fiber used in the filter material used for producing garbage incinerator is 40 tons, and the amount of short fiber reaches 240 tons, which accounts for more than 91% of the total waste incineration industry.

In the power industry, 9 household electrical appliances factories have used the PTFE long fiber filter bag foundation cloth produced by this project, with a total area of 24.

50 thousand square meters, the total weight of PTFE fiber is about 36.75 tons.

Teflon base cloth provides key support for the 30000 hour filter material life in China's power industry. The market share is over 50%.

The continuous use of pure PTFE fiber membrane filter material is as high as 250 degrees centigrade, and the instantaneous working temperature reaches 280 degrees.

The service life is as long as 4 years, far exceeding that of ordinary membrane filter media.

According to the introduction, PM2.5 refers to particles in the atmosphere whose diameters are less than or equal to 2.5 microns, also known as particulates, which have important effects on air quality and visibility.

Compared with the coarser atmospheric particles, PM2.5 has a small particle size, rich in toxic and harmful substances, and has a long residence time and a long distance in the atmosphere. Therefore, it has a greater impact on human health and atmospheric environmental quality.

In most parts of China, especially in North China where industrial concentration is concentrated, PM2.5 accounts for more than half of the total weight of airborne particulate matter.

PM2.5 is also the main cause of haze weather, but in the past, there was no PM2.5 in China's air quality standards.

The Ministry of environmental protection recently issued the "weight method" for determining PM10 and PM2.5 in ambient air. For the first time, the determination of PM2.5 in suspended particles in air with diameters less than or equal to 2.5 microns was standardized.

The filtration efficiency of PM2.5 using polytetrafluoroethylene and its coated filter media is as high as 99.99%.

All of these have made great contributions to the implementation of the policies and guidelines for energy conservation and emission reduction in China, making our country in the key area of PTFE filter material no longer controlled by others and saving the cost of environmental protection investment for the country.