CN-119685954-B - Method for improving thermal stability of industrial polyethylene fiber fabric

Abstract

The invention provides a method for improving the thermal stability of an industrialized polyethylene fiber fabric, which comprises the following steps of A) blending a polyethylene raw material, a photoinitiator and an auxiliary crosslinking agent to obtain a mixture, B) carrying out melt spinning on the mixture to obtain polyethylene fibers, C) drawing and weaving the polyethylene fibers to obtain the polyethylene fiber fabric, and D) carrying out ultraviolet irradiation on the polyethylene fiber fabric to obtain a modified polyethylene fiber fabric. The invention has the core advantages of simplicity of the operation flow, significance of the treatment effect and high efficiency, realizes the remarkable improvement of the thermal stability of the polyethylene fiber fabric from a plurality of layers by finely regulating and controlling the blending system and the ultraviolet irradiation condition, thereby solving the limitation of the polyethylene fiber fabric on the application of fabric textiles and providing a reliable scheme for the industrialized development of common polyethylene fiber fabrics.

Inventors

• LAI YUKUN
• YE JIEMAO
• Qiu shuo

Assignees

• 安踏（中国）有限公司

Dates

Publication Date

20260512

Application Date

20241227

Claims (6)

1. 1. A method for improving the thermal stability of an industrial polyethylene fiber fabric, comprising the following steps: A) Blending a polyethylene raw material, a photoinitiator and an auxiliary crosslinking agent to obtain a mixture; the density of the polyethylene raw material is 0.90-0.96 g/cm 3 , the polyethylene raw material is medium molecular weight polyethylene, and the number average molecular weight of the polyethylene raw material is 100000-500000; The photoinitiator is diphenyl ketone, and the mass concentration of the photoinitiator in the mixture is 2-4wt%; the auxiliary crosslinking agent is triallyl isocyanurate, and the mass concentration of the auxiliary crosslinking agent in the mixture is 1-2wt%; b) Carrying out melt spinning on the mixture to obtain polyethylene fibers; C) Drawing and weaving the polyethylene fibers to obtain polyethylene fiber fabrics; before the polyethylene fiber fabric is obtained, ultraviolet light shielding production is adopted; D) And carrying out ultraviolet irradiation on the polyethylene fiber fabric to obtain the modified polyethylene fiber fabric.
2. 2. The method according to claim 1, wherein the blending in step a) is solution blending or dry blending; the solution blending comprises the steps of: stirring polyethylene raw materials, a photoinitiator and an auxiliary crosslinking agent in absolute ethyl alcohol in a dark place, and then distilling under reduced pressure to remove the absolute ethyl alcohol to obtain a mixture; The dry blending comprises the following steps: and crushing the polyethylene material to obtain polyethylene particles, and stirring and mixing the polyethylene particles, the photoinitiator and the auxiliary crosslinking agent to obtain a mixture.
3. 3. The method according to claim 1, wherein the temperature of the melt spinning is 150-200 ℃.
4. 4. The method according to claim 1, wherein the draft ratio in the step C) is 1 to 4 times.
5. 5. The method according to claim 1, wherein the irradiation intensity of the ultraviolet light is 1500-2500 mW/cm 2 , and the irradiation time of the polyethylene fiber fabric under the ultraviolet light is 15-60 s.
6. 6. The method according to claim 1, wherein the gel content of the modified polyethylene fiber fabric is >70%.

Description

Method for improving thermal stability of industrial polyethylene fiber fabric Technical Field The invention belongs to the technical field of material manufacturing, and particularly relates to a method for improving the thermal stability of an industrial polyethylene fiber fabric. Background Polyethylene fiber is a high polymer material with excellent physical properties and chemical stability, and is widely applied to various industrial fields of automobiles, aerospace, electronic appliances and the like. Because of its unique properties, polyethylene fibers are an indispensable material in many fields, providing powerful support for industrial development. However, although polyethylene fibers perform well at normal temperature, their performance faces a great challenge in high temperature environments. Although the ultra-high molecular weight polyethylene fiber has excellent thermal stability, the expensive cost is definitely not suitable for industrialization in the textile field, and the low-cost medium molecular weight polyethylene fiber has poor thermal stability, so that the further development and application of the ultra-high molecular weight polyethylene fiber in the textile field are greatly limited. Therefore, the heat stability of the common medium molecular weight polyethylene fiber fabric is improved, and the problem of industrialization of the common medium molecular weight polyethylene fiber fabric is solved, so that the problem to be solved is urgent. In order to overcome this problem, researchers have conducted a great deal of research and study. They have attempted to enhance the thermal stability of polyethylene fibers by adjusting the length of the molecular chains, the degree of branching, etc. starting from changing the molecular structure of the fibers. However, this approach often requires complex synthesis processes and expensive costs, and the effect is not always satisfactory. In addition, researchers have tried methods of adding heat stabilizers. The heat stabilizer inhibits the occurrence of thermal degradation by reacting with unstable groups in the polyethylene fiber. Although this approach improves the thermal stability of the polyethylene fibers to some extent, the type and amount of heat stabilizer needs to be precisely controlled, otherwise it may negatively affect other properties of the fibers. While ultraviolet crosslinking modification is very suitable for modification of polyethylene fibers, although researchers have made some progress, the existing method still has the problems of limited effect, complex operation, high cost, difficult industrialization and the like, and the actual application requirements are difficult to meet. Therefore, developing a method that is both efficient and practical to improve the thermal stability of polyethylene fiber fabrics and solve the industrialization problem has become a great challenge in the field of material science. Disclosure of Invention The invention aims to provide a method for improving the thermal stability of an industrialized polyethylene fiber fabric, which can effectively improve the thermal stability of the polyethylene fiber fabric in a high-temperature environment, greatly shorten the production period and meet the industrialized demand. The invention provides a method for improving the thermal stability of an industrial polyethylene fiber fabric, which comprises the following steps: A) Blending a polyethylene raw material, a photoinitiator and an auxiliary crosslinking agent to obtain a mixture; b) Carrying out melt spinning on the mixture to obtain polyethylene fibers; C) Drawing and weaving the polyethylene fibers to obtain polyethylene fiber fabrics; D) And carrying out ultraviolet irradiation on the polyethylene fiber fabric to obtain the modified polyethylene fiber fabric. Preferably, the density of the polyethylene raw material is 0.90-0.96 g/cm 3, the polyethylene raw material is medium molecular weight polyethylene, and the number average molecular weight of the polyethylene raw material is 100000-500000. Preferably, the photoinitiator is benzophenone, and the mass concentration of the photoinitiator in the mixture is 2-4wt%. Preferably, the auxiliary crosslinking agent is triallyl isocyanurate, and the mass concentration of the auxiliary crosslinking agent in the mixture is 1-2wt%. Preferably, the blending in the step A) is solution blending or dry blending; the solution blending comprises the steps of: stirring polyethylene raw materials, a photoinitiator and an auxiliary crosslinking agent in absolute ethyl alcohol in a dark place, and then distilling under reduced pressure to remove the absolute ethyl alcohol to obtain a mixture; The dry blending comprises the following steps: and crushing the polyethylene material to obtain polyethylene particles, and stirring and mixing the polyethylene particles, the photoinitiator and the auxiliary crosslinking agent to obtain a mixture. Preferably, the tem