CN-121974599-A - Preparation method and application of regenerated fiber of waste fan blade

Abstract

The invention discloses a preparation method and application of waste fan blade regenerated fibers, wherein the obtained regenerated fibers are excellent in mechanical properties, and are subjected to surface chemical modification to realize 'active' bonding with a concrete matrix by adopting a composite process route of 'accurate cutting + controllable crushing + inert atmosphere pyrolysis + ultrasonic auxiliary surface activation', and the reinforcing effect of the regenerated fibers is far superior to that of the traditional recycled fibers. Compared with the prior art, the method systematically solves the problems of performance, interface and homogenization of the recycled fiber, avoids expensive chemical solvents, realizes the recycling of part of byproducts through gas recovery, has simple and controllable whole flow, and has remarkable industrial application potential and cost advantages. The method provides a key high-performance reinforcing material for the high seawater erosion resistance full solid waste carbon-negative concrete, ensures the reliability and success rate of downstream concrete mix proportion design and component performance research, and forms a complete technical innovation chain from solid waste to high-performance products.

Inventors

• MENG QINGYONG
• LI YUEHUAN
• ZHANG GONG
• ZHANG QINGHUA
• ZHANG HAILUN
• SUN TAO
• SUI YUPENG
• WANG JUNYONG
• FENG HONGYU
• ZHANG JIAN
• YANG XIAOJIE
• DONG SHAOMING
• LIANG CHUNYANG

Assignees

• 中国二十二冶集团有限公司

Dates

Publication Date

20260505

Application Date

20260130

Claims (6)

1. 1. The preparation method of the regenerated fiber of the waste fan blade is characterized by comprising the following steps: 1. Cutting, namely cutting waste fan blades by adopting a high-pressure water jet cutting system; 2. crushing, namely crushing the cut fan blades by adopting a double-shaft shearing crusher; 3. pyrolysis, namely placing the crushed materials into a pyrolysis furnace, and pyrolyzing under the protection of high-purity nitrogen; 4. Surface activation, namely cooling to be less than 60 ℃ under the protection of inert atmosphere after pyrolysis is finished, taking out a solid product, and obtaining regenerated fibers through vibration screening; And immersing the regenerated fiber in a gamma-aminopropyl triethoxysilane ethanol solution with the weight of 1.0-2.0wt%, carrying out ultrasonic treatment for 20-40 minutes at 50-60 ℃, and then drying and curing for 2 hours at 105 ℃ to obtain the regenerated fiber of the waste fan blade.
2. 2. The method for producing regenerated fiber of waste fan blade according to claim 1, wherein the cutting path is performed in a direction perpendicular to the main fiber axis, the water pressure is set to 300 to 400mpa, the jet diameter is 0.8 to 1.2mm, the cutting speed is controlled to 0.8 to 1.5m/min, and the cooling is performed by using emulsion.
3. 3. The method for preparing regenerated fibers of waste fan blades according to claim 1, wherein the crushing granularity is strictly controlled to be 10-20 mm, the rotating speed of equipment is 250-400 rpm, and the crushing cavity is provided with an air cooling or liquid nitrogen cooling system to ensure that the process temperature is lower than 60 ℃.
4. 4. The method for producing regenerated fibers from waste fan blades according to claim 1, wherein the pyrolysis step is programmed to a temperature of 500 to 580 ℃ at a rate of 8 to 12 ℃ per minute, and is maintained at the constant temperature for 1.5 to 2.5 hours.
5. 5. The method for preparing the regenerated fiber of the waste fan blade according to claim 1, wherein the fiber length of the regenerated fiber of the waste fan blade is 5-20 mm, the length-diameter ratio is more than or equal to 50, the tensile strength of the monofilament fiber is more than or equal to 800MPa, the elastic modulus is more than or equal to 40GPa, and the strength retention rate is not lower than 85% of that of the fibril.
6. 6. An application method of the waste fan blade regenerated fiber prepared by the preparation method according to any one of claims 1 to 5 is characterized in that the reinforcing phase for the Cl - 、SO 4 2- -rich total solid waste low-carbon concrete is doped with 0.5% -1.5% of the volume of the concrete.

Description

Preparation method and application of regenerated fiber of waste fan blade Technical Field The invention relates to the technical field of solid waste recycling and marine construction materials, in particular to a preparation method and application of waste fan blade regenerated fibers. Background Global energy conversion is pushing a large number of early fans into retirement, producing a large number of waste fan blades made of glass fiber/carbon fiber reinforced composites. The traditional disposal mode (landfill and incineration) faces double pressure of environment and economy, and the utilization of high-value resources is urgent. Meanwhile, ocean engineering construction suffers from insufficient durability due to easy cracking, brittleness and seawater erosion of concrete for a long time. Although fiber reinforcement is an effective approach, metal fibers (such as steel fibers) are easy to rust in a chloride ion-enriched marine environment, corrosion products expand to damage a concrete structure, synthetic fibers (such as polypropylene fibers) have low elastic modulus, are chemically inert with a cement matrix, have weak interfacial adhesion and have limited reinforcing and toughening effects. Therefore, the high-performance fibers in the waste fan blades are recycled and used for reinforcing the marine concrete, so that an ideal 'waste control and cheating' technical path is formed. However, the industrial application of this path still faces the following recovery technology bottlenecks: 1. difficulty in performance degradation during fiber recovery The mechanical recovery is mainly rough crushing treatment, the obtained product is chopped powder wadding, the length-diameter ratio of the fiber is extremely low, the load cannot be effectively transmitted, and the value of the product serving as a reinforcing phase is lost. In the air pyrolysis method, pyrolysis is carried out in the air, and resin is removed, but the fiber (especially glass fiber) can obviously reduce strength and modulus under the high-temperature oxidation environment, and the fiber surface is smooth and has poor adhesion with concrete. 2. Difficult problem of interfacial compatibility between fiber and concrete The surface chemical inertness of the recycled fiber is unknown with the alkalinity environment and the compatibility of the novel Cl -、SO42- -rich total solid waste low-carbon concrete and hydration products, and a weak interface transition zone is easy to form, so that the recycled fiber becomes a rapid channel for erosion medium permeation. 3. Difficult problems of process standardization and industrialization The fiber performance produced by the existing recovery process has large fluctuation, cannot meet the basic requirements of engineering materials on homogeneity and stability, and is difficult to carry out reliable concrete mix proportion design and performance prediction. Disclosure of Invention In order to solve the technical problems, the invention provides a preparation method and application of waste fan blade regenerated fibers, and relates to a standardized preparation method of waste fan blade regenerated fibers with high performance, low damage and strong interface bonding. In order to achieve the technical purpose, the invention adopts the following scheme: in a first aspect, the invention provides a method for preparing regenerated fibers of waste fan blades, comprising the following steps: 1. Cutting, namely cutting waste fan blades by adopting a high-pressure water jet cutting system; 2. crushing, namely crushing the cut fan blades by adopting a double-shaft shearing crusher; 3. Pyrolysis, namely placing the crushed materials into a pyrolysis furnace, and carrying out pyrolysis under the protection of high-purity nitrogen (the purity is more than or equal to 99.99 percent); 4. Surface activation, namely cooling to be less than 60 ℃ under the protection of inert atmosphere after pyrolysis is finished, taking out a solid product, and obtaining regenerated fibers through vibration screening; And immersing the regenerated fiber in 1.0-2.0wt% of gamma-aminopropyl triethoxysilane (KH-550) ethanol solution, performing ultrasonic treatment at 50-60 ℃ for 20-40 minutes (300-500W), and then drying and curing at 105 ℃ for 2 hours to obtain the regenerated fiber of the waste fan blade. Further, the cutting path is optimized according to the main bearing direction of the blade, and cutting is preferentially performed along the direction perpendicular to the main axis of the fiber so as to maximize the original effective length of the retained fiber. Further, the water pressure is set to be 300-400 MPa, the jet diameter is 0.8-1.2 mm, the cutting speed is controlled to be 0.8-1.5 m/min, and the emulsion is adopted for cooling, so that resin carbonization and fiber performance damage caused by a heat affected zone are effectively avoided. Further, according to thickness gradients (10-150 mm) of different parts o