Project Name: Key Technology and Industrialization of Free Liquid Surface Multi-jet Electrospun Nonwoven Material
Project Completion Units: Donghua University, Suzhou Jiuyi Hi-Tech Nonwoven Equipment Co., Ltd., Zhongyuan Institute of Technology, Suzhou Jinquan New Material Co., Ltd., Suzhou Kangfute Environmental Technology Co., Ltd., Henan Engineering Institute, Changyuan Hutai Nonwovens Co., Ltd. the company
The textile industry is China's pillar industry, of which industrial textiles account for more than 25%. However, the domestic low-end homogenization of such materials is serious, and the bottlenecks of high value-added and functional products relying heavily on imports. The micro-nano fiber nonwoven material prepared by electrospinning has high specific surface area and high adsorption characteristics, and can prepare high-value-added industrial textiles such as high-efficiency low-resistance filter materials, directional diffusion water-conducting sanitary materials, etc. It is the textile of China's "13th Five-Year Plan" One of the key industrial development directions. However, the existing electrostatic spinning technology has problems such as unstable spinning process, large dispersion of fiber diameter, and inability to prepare on a large scale. In order to solve this dilemma, the project was funded by the National Science and Technology Support Program, the National Natural Science Foundation of China, and the Science and Technology Guidance Project of the China Textile Industry Federation. After more than ten years of research, the free-surface multi-jet electrostatic spinning micro-nano fiber Controlled and stable mass production of woven materials. By compounding with non-woven substrates such as spunbond hot rolling and hot air, it provides solutions for the industrialization of high value-added, functional micro-nano nonwoven materials.
The innovative results of this project: (1) Established the theory of precise control of micro-nano fiber diameter controlled by single jet controlled jet drawing, established a jet-stretching refinement model induced by media, and solved the uncontrollable micro-nano fiber spinning process. The problem of uncontrollable diameter dispersion reduces the CV value of the micro-nano fiber diameter to less than 30%. (2) A dynamic balanced free-level multi-jet control theory was constructed, and a series of spatially symmetrical free-level liquid-spinning nozzles were developed. The multi-jet pitch was only 5 mm, the envelope angle was stable at 100, and the fiber diameter CV value was reduced to less than 15%. To achieve a significant reduction in fiber diameter distribution, the single nozzle production capacity is more than 250mL / hour, which is 160 times that of traditional needles. (3) Invented the vertical and horizontal multi-module phase compensation meshing technology, which realized the variable embedding of micro-nano fiber gradients (horizontal) and high-orientation (longitudinal) networking, respectively. It is a micro-nano narrow-fiber non-woven filter material and Laid the foundation for industrial preparation of directional diffusion water-conducting sanitary materials. The annual production capacity of the 1800mm 4 module 8 nozzle production line developed by the project team has reached over 1.5 million square meters. (4) The low-speed, sub-melting-point hot-rolled lamination and two-way hot-air high-speed lamination technology of micro-nano non-woven materials with diameter and pore gradient structure and PP / PE two-component hot air substrate are studied. The filtration efficiency of the prepared filter material is> 99.999%. Filter resistance <106Pa; Developed a highly oriented PLA micro / nano fiber composite hot air process for PLA / ES substrate, prepared directional diffusion water-conducting sanitary material, liquid diffusion speed ratio in different directions> 6, and liquid penetration rate> 3mL / s • cm2.
The project has been authorized 46 national patents, formulated one industry standard, published 50 SCI theses, and formed a complete intellectual property system. The project results have been promoted and applied, and 7 micro-nano nonwoven production lines have been formed. In the past three years, 7175.6 tons of micro-nano fiber composite nonwovens have been produced, with a new revenue of 241 million yuan and a new profit of 35.56 million yuan. The results of the appraisal show that the overall technology of the project has reached the international advanced level.
