Further Development Of Wet Spinning Process, Weihai Develops Its Own High-Performance Carbon Fiber Technology And Industrial System Construction.

In the textile industry, the state-of-the-art printing and dyeing technology innovation center, which has just been approved, has been set up last year, the national advanced functional fiber innovation center, and the national high performance medical device innovation center, which is approved by the Ministry of industry and technology this year, the national integrated circuit technology and packaging testing innovation center, and the national rare earth functional material innovation center, all of which are urgently needed by the state. The key to achieving technological breakthroughs is the foundation of manufacturing power.

The implementation of the "innovation driven development strategy" is to seize the key and make up the short board. This is the need for national development. In particular, it also relieves the need for some core technologies to be choking. For example, the strategic industries represented by carbon fiber must be self controlled and have to exert national strength and plan for development in a planned and systematic way.

Preparation of wet spinning process for carbon fiber with important strategic significance

High performance polyacrylonitrile (PAN) based carbon fiber is a new dual-use material related to national strategic security. It has been subjected to a strict embargo by the international community for a long time. The development and development of key equipment fields have been seriously restricted. As the important technical basis of carbon fiber, the wet spinning process is the key technology of domestic carbon fiber research.

Due to the influence of carbon fiber precursor preparation technology, until the end of last century, the development of domestic carbon fiber technology has been lingering in the low level of industrialization. The carbon fiber of national defense equipment's structural composite materials is totally dependent on imports, which brings great potential to national security and development. It is urgent to develop and develop carbon fiber localization technology to meet the needs of high-end equipment in key fields in China. To achieve the autonomous guarantee of key materials.

PAN based carbon fiber has the longest technological process in the field of materials, including polymerization, spinning, pre oxidation, carbonization (graphitization) and surface treatment. The carbon fiber prepared by wet spinning process of PAN solution has a unique surface groove structure, which is conducive to improving the interfacial properties of carbon fiber reinforced polymer composites as structural materials. The carbon fiber produced by wet spinning process has long been used in the national defense field represented by aerospace. Therefore, the development of wet spinning process with carbon fiber has important strategic significance and market value in China.

"Created a carbon fiber variety", forming a series of products based on the wet spinning process.

Weihai development Fiber Co., Ltd. based on the preparation of CFRP as the technology and industrial base, based on the persistence of the localization of the key strategic materials in the country, and based on the pursuit of independent control of the key raw materials in the industrial chain, we devote ourselves to the research and industrialization of PAN based carbon fiber localization technology.

Under the support of the Ministry of science and technology, the Bureau of science and technology, the Ministry of development and reform, the Ministry of industry and the Ministry of industry and other ministries, with the support of the technology and industrialization plan, under the traction of the key models, the traditional two methylsulfoxide wet spinning technology is controlled by the fiber defect, the control of the cross section morphology of the fiber surface, the consistency control of the multi spun bit / multi tow process state, and the carbon fiber performance / regulation to meet the high-end application requirements. In order to solve these problems, Weihai has expanded its joint research institutes such as Beijing University of Chemical Technology and Fudan University. Based on the independent innovation and original innovation of technology and technology, the new technology and industrialization technology of carbon fiber precursor were prepared through the wet spinning process of two methyl sulfoxide, and combined with the re innovation of key equipment, a number of key technological breakthroughs were achieved.

Break through the key technology of high quality spinning solution, and solve the problem of debinding and defoaming of polymer solution with high solid content and high viscosity.

A new technology of washing / pulling integrated combined drafting technology and equipment, independent innovation and multi spun bit spinning technology has been developed, which has effectively improved the consistency and stability of the quality of the original yarn.

We have developed high effective raw silk drafting process and equipment with temperature gradient characteristics and effective control of carbon fiber modulus to meet the needs of aviation field.

The new technology of hot air interactive transportation pre oxidation furnace has been developed, which breaks the traditional four temperature zone mode and establishes a new six temperature zone technology. It breaks through the bottleneck of high efficiency and long-term stable operation of 3 meters wide pre oxidation equipment.

A new low fineness PAN precursor spinning technology was developed to optimize the radial homogenization and axial high orientation of low fineness precursors.

A fiber pre oxidation technology with controllable structure combination has been developed to solve the technical problems of medium and high modulus carbon fibers.

The key technology of localization, including the simulation design, manufacturing and operation pipe, has been developed to solve the problem of quality consistency of different modulus carbon fiber industrialization.

Through systematic technical research, we have developed a series of technologies and products based on tensile strength, series technology and products based on tensile modulus, and series technology and products based on the specifications of wire tow, and have realized the large-scale production and large-scale application of high performance carbon fiber, and established a complete technological research and development and high strength carbon fiber industrialization based on wet spinning process. Department.

The mechanical properties of T300 grade and T800 class carbon fiber products developed by the project exceed the similar product level and performance stability of Dongli Japan's company. The breakthrough speed of 300m/min spinning under multi spun position makes the industrial wet spinning speed increase by more than 1.5 times, creating an innovative confidence for the industry. The original innovative high-strength carbon fiber products, tensile strength and modulus reached the level of T700S carbon fiber in Dongli, Japan, the interface performance of the composite is superior to that of the product (Dongli only has dry wet T700 grade, no wet T700 grade), and experts believe that "a carbon fiber variety with excellent surface structure properties of T700 grade carbon fiber and T300 grade carbon fiber has been created."

Practicing domestic carbon fiber development strategy with strong strength

The development of stable carbon fiber products based on wet spinning process in Weihai has been widely used in national defense construction, such as aviation, aerospace, weapons and electronics, wind power and other high-end industrial equipment, as well as civil engineering. It is the first and best supplier in the field of national defense in terms of carbon fiber main supplier and aviation field. It not only solves the problem of "localization" of structural carbon fiber domestically. The problem of "availability" and "ease of use" has broken the monopoly of foreign countries in this field, realized the independent guarantee of the key strategic materials in China, and has become the largest carbon beam supplier of -Vestas, the leading international wind power enterprise in China. With its unremitting efforts, Weihai has been carrying out the "key technologies" that are not to come, buy or refuse. Only by grasping the key core technologies in our own hands can we fundamentally protect national economic security, national defense security and other security ".

For the "high strength PAN based carbon fiber industrialization preparation technology based on wet spinning process", the expert appraisal said: "based on original innovation and independent innovation, the project has achieved independent innovation based on DMSO intermittent polymerization and wet spinning, and has made large-scale and stable preparation of high strength / high strength medium modulus PAN based carbon fiber, covering GQ3522 (T300 level), GQ4522 (T700 level) and QZ5526 (T800) series products, supporting the national defense key batch production of composite materials. The overall achievement has reached the international advanced level. The project won the first prize of science and technology progress of China Textile Industry Federation in 2019.

Weihai, which has always attached importance to the intellectual property strategy, has authorized 11 national invention patents and 18 utility model patents in the field of PAN wet spinning high performance carbon fiber, and has led the first national standard of PAN based carbon fiber in China, and has formulated a series of enterprise product standards.

Facing the very important and promising sunrise industry of carbon fiber, Weihai will expand its tenet of "revitalizing the national industry and persisting in serving the country with industry". It will continue to improve its strength with technological innovation as its core and strive to become a globally competitive manufacturer of carbon fiber industrial chains.