On June 27, 2023, the China National Textile and Apparel Council organized a "soft/elastic" joint event jointly undertaken by Donghua University,NanoFiltech The project appraisal meeting of the key technology and application of industrialization of ceramic microfiber materials, the appraisal committee believes that the project results have reached the international advanced level.

The research results of the project are introduced as follows:

1. Project research background

Due to its advantages of high temperature resistance, corrosion resistance and oxidation resistance, ceramic fiber has become a key high-temperature insulation material in the fields of aerospace, national defense, energy and environment. In recent years, the ceramic fiber industry has developed rapidly, and my country has listed it as a high-end high-performance material for major development. However, conventional ceramic fiber preparation methods such as dry spinning, melt blowing, centrifugal spinning, etc., usually have a fiber diameter of more than 5 μm, large pore size, and low porosity, making it difficult to improve the thermal insulation performance of ceramic fiber materials. On the contrary, when the fiber diameter is less than 0.5 μm, the material has the characteristics of small pore size and high porosity, showing great application potential in fields such as high temperature insulation.

Electrospinning is the main method for preparing ceramic ultrafine fibers, but its slow production speed and low conversion rate of hybrid fibers make it difficult to carry out large-scale production and cannot be directly processed into flake materials, which greatly hinders the development of this method. Practical application of technology. Therefore, this project has developed a key technology for the industrialization of one-step preparation of soft/elastic ceramic ultrafine fiber materials, and successfully achieved a substantial increase in the mechanical properties and output of ceramic fiber materials.

2. Main innovation points of the project

1）Established a high-efficiency spinning theoretical system with a low-arc liquid surface, invented a multi-jet spinning technology based on a wide inner diameter nozzle, and greatly improved the production speed of ultra-fine fibers.

2）A polymer/inorganic colloidal spinning solution formula with low molecular weight and low polymer content has been developed to achieve high-efficiency conversion of hybrid fibers with high inorganic components.

3）Invented the crimping fiber spinning jet with high inorganic component content and its three-dimensional entanglement assembly technology, and realized the one-step forming of three-dimensional network structure crimped fiber flakes.

4）The rapid calcination molding technology of soft/elastic ceramic ultrafine fiber flakes has been developed, which endows ceramic fiber flakes with excellent flexibility and superelasticity.

3. Project industrialization and application

The project integrates and develops a complete set of production equipment for ultrafine fibers, builds a demonstration production line for ultrafine fibers with independent intellectual property rights, realizes efficient and large-scale production of ultrafine fibers, promotes the upgrading of my country's ceramic fiber industry structure, and improves the entire industry The level of development has enhanced international competitiveness. The soft/elastic ceramic microfiber materials and fire insulation equipment developed by the project have been successfully used in emergency rescue, national defense, aerospace and other fields, and have been well received by users.

4. Brief introduction of the project completion unit

Donghua University is a high-level university with advantages in textiles, materials, and design. It is a "211 Project" construction university directly under the Ministry of Education. It has key laboratories, engineering technology research centers, provincial and ministerial scientific research platforms, intelligence introduction bases, and a series of experimental teaching demonstration and innovation centers. Donghua University has undertaken a number of major scientific research tasks in recent years, and the results have been widely used in national defense and military industry, aerospace, high-end equipment, major construction projects, environmental protection, life and health, artificial intelligence and other fields, making important contributions to the development of science and technology in my country. contribute.

NanoFiltech has always focused on the research and development and production of high-end functional nanofiber materials. The high-efficiency nanofiber filter materials developed by the company have brought a new revolution to the air purification industry. The application fields cover semiconductor, liquid crystal panel, hospital, biomedicine, food, commercial building, hotel, residence, animal husbandry, chemical industry, pulp industry, air conditioning supporting, coating industry, mechanical processing, catering, rail transit and other industries. As an industry-leading professional manufacturer of nanofiber materials, the company's technical team has more than 20 years of research experience in the field of functional nanofiber material manufacturing, and has more than 30 core patented technologies for nanofiber manufacturing. The company always adheres to the business philosophy of "innovation, change, and embrace the future", gives full play to the advantages of a specialized, special and new "little giant" enterprise, and is committed to becoming the world's top manufacturer and supplier of nanomaterials.

Shanghai Chengge Safety Equipment Group Co., Ltd. focuses on the safety and emergency industry, specializing in the research and development, production and sales of emergency rescue equipment, personal safety protection equipment, special functional protective clothing, safety appliances, electrical fire protection and new safety emergency materials. The company is also an integrator of MRO products and services related to the safety and emergency industry, providing one-stop solutions for operators who may be exposed to various high-risk environments such as arcs, electric fields, high temperatures, flash fires, and chemicals, as well as various emergencies plan. The company upholds the spirit of innovation and continuously invests in new technology research and new product development. It has successively won the honorary titles of "Specialized, Specialized and New" and high-tech enterprises in Shanghai, and has obtained ISO9001, ISO14001 and ISO45001 management system certification.

NanoFiltech will continue to devote itself to R&D and innovation, make greater contributions to the development of the industry, and promote the application and industrialization of high-end functional nanomaterials. We will uphold the concept of high-level scientific research and independent innovation, continuously improve our technical strength, and return the trust and support of our customers with high-quality products and services.