Method for improving thermal stability of industrialized polyethylene fiber fabric

Abstract

The application provides a method for improving the thermal stability of industrialized polyethylene fiber fabric, comprising the following steps: A) blending polyethylene raw material, a photoinitiator and an auxiliary crosslinking agent to obtain a mixture; B) melt spinning the mixture to obtain polyethylene fibers; C) after drawing and weaving the polyethylene fibers, polyethylene fiber fabric is obtained; D) the polyethylene fiber fabric is subjected to ultraviolet light irradiation to obtain modified polyethylene fiber fabric. The core advantage of the application lies in the simplicity of the operation process and the obviousness and high efficiency of the treatment effect. By finely adjusting the blending system and the ultraviolet light irradiation conditions, the thermal stability of the polyethylene fiber fabric is significantly improved from multiple aspects, thereby solving the limitation of the polyethylene fiber fabric in the application of fabric textiles, and providing a reliable scheme for the industrialized development of ordinary polyethylene fiber fabric.

Description

Technical Field

[0001] This invention belongs to the field of materials manufacturing technology, and in particular relates to a method for improving the thermal stability of industrialized polyethylene fiber fabrics. Background Technology

[0002] Polyethylene fiber is a polymer material with excellent physical properties and chemical stability, widely used in various industrial fields such as automobiles, aerospace, and electronics. Due to its unique properties, polyethylene fiber has become an indispensable material in many fields, providing strong support for industrial development. However, although polyethylene fiber performs well at room temperature, its performance faces significant challenges at high temperatures. While ultra-high molecular weight polyethylene fiber exhibits excellent thermal stability, its high cost makes it unsuitable for industrialization in the textile industry. Meanwhile, low-cost medium molecular weight polyethylene fiber has poor thermal stability, greatly limiting its further development and application in the fabric field. Therefore, improving the thermal stability of ordinary medium molecular weight polyethylene fiber fabrics and solving its industrialization problems has become an urgent issue to be addressed.

[0003] To overcome this challenge, researchers have conducted extensive exploration and research. They have attempted to enhance the thermal stability of polyethylene fibers by altering parameters such as chain length and branching degree. However, this method often requires complex synthesis processes and incurs high costs, and the results are not always satisfactory. Furthermore, researchers have tried adding heat stabilizers. Heat stabilizers inhibit thermal degradation by reacting with unstable groups in polyethylene fibers. While this method improves the thermal stability of polyethylene fibers to some extent, the type and amount of heat stabilizer need precise control; otherwise, it may negatively impact other fiber properties. Ultraviolet (UV) crosslinking modification is well-suited for modifying polyethylene fibers. Although researchers have made some progress, existing methods still suffer from limited effectiveness, complex operation, high costs, and difficulties in industrialization, making it difficult to meet the needs of practical applications. Therefore, developing an efficient and practical method to improve the thermal stability of polyethylene fiber fabrics and solve industrialization problems has become a major challenge in the field of materials science. Summary of the Invention

[0004] The purpose of this invention is to provide a method for improving the thermal stability of industrialized polyethylene fiber fabrics. The method of this invention can effectively improve the thermal stability of polyethylene fiber fabrics under high temperature environments while significantly shortening the production cycle and meeting industrial needs.

[0005] This invention provides a method for improving the thermal stability of industrialized polyethylene fiber fabrics, comprising the following steps:

[0006] A) A mixture is obtained by blending polyethylene raw material, photoinitiator and auxiliary crosslinking agent;

[0007] B) The mixture is melt-spun to obtain polyethylene fibers;

[0008] C) After stretching and weaving, the polyethylene fibers are used to obtain a polyethylene fiber fabric;

[0009] D) The polyethylene fiber fabric is subjected to ultraviolet irradiation to obtain a modified polyethylene fiber fabric.

[0010] Preferably, the density of the polyethylene raw material is 0.90–0.96 g / cm³. 3 The polyethylene raw material is medium molecular weight polyethylene, and the number average molecular weight of the polyethylene raw material is 100,000 to 500,000.

[0011] Preferably, the photoinitiator is benzophenone, and the mass concentration of the photoinitiator in the mixture is 2-4 wt%.

[0012] Preferably, the auxiliary crosslinking agent is triallyl isocyanurate, and the mass concentration of the auxiliary crosslinking agent in the mixture is 1-2 wt%.

[0013] Preferably, the blending in step A) is solution blending or dry blending;

[0014] The solution blending includes the following steps:

[0015] The polyethylene raw material, photoinitiator and auxiliary crosslinking agent were stirred in anhydrous ethanol in the dark, and then the anhydrous ethanol was removed by vacuum distillation to obtain a mixture.

[0016] The dry mixing process includes the following steps:

[0017] The polyethylene material is crushed to obtain polyethylene particles. Then, the polyethylene particles, photoinitiator, and auxiliary crosslinking agent are stirred and mixed to obtain a mixture.

[0018] Preferably, the melt spinning temperature is 150–200°C.

[0019] Preferably, the stretching ratio in step C) is 1 to 4 times.

[0020] Preferably, the intensity of the ultraviolet irradiation is 1500–2500 mW / cm². 2 The polyethylene fiber fabric is irradiated with ultraviolet light for 15–60 seconds.

[0021] Preferably, the gel content of the modified polyethylene fiber fabric is >70%.

[0022] Preferably, the production process involves avoiding ultraviolet light before obtaining the polyethylene fiber fabric.

[0023] This invention provides a method for improving the thermal stability of industrialized polyethylene fiber fabrics, aiming to significantly enhance the heat resistance of polyethylene fiber fabrics under extreme high-temperature conditions while improving production efficiency and solving industrialization problems. First, medium-molecular-weight polyethylene is used as the base material. Then, a photoinitiator and an auxiliary crosslinking agent are introduced and efficiently blended with the polyethylene matrix to construct a potential reactive network. Under precise control of melt spinning technology, the uniformly mixed fiber precursor is processed into polyethylene fibers with uniform morphology. Further stretching further improves the parallelism and straightness of the fibers, further enhancing their strength and stability, thereby improving the strength and durability of the fabric. The obtained polyethylene fibers are stored in the dark and woven. Subsequently, ultraviolet irradiation technology is used to crosslink the woven fabric. In this step, the photoinitiator is activated under ultraviolet light irradiation, inducing a chemical crosslinking reaction between the crosslinking agent and the polyethylene molecular chains within the fiber, forming a stable three-dimensional network structure, thus significantly enhancing the thermal stability of the fiber; between fibers, crosslinking between nodes is initiated, strengthening internal forces and improving overall heat resistance and dimensional stability. Simultaneous irradiation of the fabric can improve cross-linking efficiency while ensuring the cross-linking effect, solving the problem of poor cross-linking effect caused by excessive spinning speed during the spinning stage. This improves efficiency in actual production and solves industrialization issues. After this treatment process, polyethylene fiber fabrics exhibit excellent physical and mechanical properties and superior chemical stability at high temperatures, effectively overcoming the limitations of traditional polyethylene fibers, such as easy degradation and performance decline under high temperatures, and making industrial production easier to implement. This strategy greatly expands the application of ordinary polyethylene fibers in the textile field and effectively solves the industrial application problem. The core advantages of this invention lie in the simplicity of its operation process, the significant effect of the treatment, and its high efficiency. By precisely controlling the blending system and ultraviolet irradiation conditions, the thermal stability of polyethylene fiber fabrics is significantly improved from multiple levels, thereby solving its limitations in textile applications and providing a reliable solution for the industrial development of ordinary polyethylene fiber fabrics. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0025] Figure 1The structural formulas of benzophenone (BP) and triallyl isocyanurate (TAIC) in this invention are shown below.

[0026] Figure 2 This is a diagram illustrating the reaction mechanism of BP and TAIC ultraviolet light-induced crosslinking of polyethylene fibers in this invention.

[0027] Figure 3 These are ultra-depth-of-field micrographs of polyethylene fibers before and after modification in Example 1 of this invention. Detailed Implementation

[0028] This invention provides a method for improving the thermal stability of industrialized polyethylene fiber fabrics, comprising the following steps:

[0029] A) A mixture is obtained by blending polyethylene raw material, photoinitiator and auxiliary crosslinking agent;

[0030] B) The mixture is melt-spun to obtain polyethylene fibers;

[0031] C) After stretching and weaving, the polyethylene fibers are used to obtain a polyethylene fiber fabric;

[0032] D) The polyethylene fiber fabric is subjected to ultraviolet irradiation to obtain a modified polyethylene fiber fabric.

[0033] The core objective of this invention is to improve the high-temperature resistance of ordinary medium molecular weight polyethylene (MMWPE) fiber fabrics while reducing the impact of the modification process on the overall production process, significantly shortening the production cycle, and meeting industrialization needs. Through low-cost modification technology, the temperature limitations of its traditional applications are overcome, thereby broadening its application scope in high-temperature environments. Furthermore, production efficiency is improved through ultraviolet irradiation technology that combines weaving and irradiation. This not only enhances the overall performance of MMWPE fiber fabrics and shortens the entire production cycle but also provides strong support for their industrial application and development in the textile field, which is of great significance for promoting the advancement of materials science and the diversification of industrial applications.

[0034] In this invention, the polyethylene raw material is preferably medium molecular weight polyethylene, wherein the number average molecular weight of the medium molecular weight polyethylene is preferably 100,000 to 500,000; and the density is preferably 0.90 to 0.96 g / cm³. 3Compared to high molecular weight polyethylene (HMWPE), medium molecular weight polyethylene (MBPE) has more mature production technology and lower raw material and processing costs, resulting in lower production costs and making it more suitable for general industrial applications. MBPE fibers are also easier to process than HMWPE fibers. Due to its moderate molecular weight, it can form better products at lower processing temperatures. MBPE has a lower melt temperature than HMWPE, allowing for stable melt spinning at lower temperatures, thus avoiding the thermal polymerization reaction of the allyl groups in the crosslinking agent. In terms of the spinning process, the shorter molecular chains of MBPE result in better tensile properties and easier fiber formation, allowing for faster spinning speeds and higher winding machine speeds. Furthermore, the better melt flow of MBPE simplifies the design of the spinneret and the setup of the stretching equipment, leading to higher production efficiency. The stretching process of HMWPE is more complex, requiring a slower and more precise cooling process to maintain the orientation and structural stability of the molecular chains. In contrast, the spinning process of MBPE is smoother, with faster cooling and curing. It does not require additional cooling treatment, and the faster cooling rate ensures that the fibers maintain a good shape after curing, resulting in a shorter overall production cycle. Medium molecular weight polyethylene fibers can be processed under relatively conventional conditions during post-spinning and weaving processes such as heat setting and stretching. The fiber orientation and strength are relatively stable, saving resources in actual production while ensuring the stability and durability of fiber fabric products.

[0035] In this invention, the photoinitiator is preferably benzophenone (BP), and the mass concentration of the photoinitiator in the mixture is preferably 2-4 wt%, more preferably 3-4 wt%.

[0036] In the photoinitiation system of this invention, the effect of a single photoinitiator is often limited by the limited number of crosslinking nodes formed between polyethylene macromolecules through their own free radical bonding, making it difficult to maximize the initiation efficiency. Therefore, this invention creatively introduces an auxiliary crosslinking agent to significantly enhance the efficiency and depth of the crosslinking reaction. The auxiliary crosslinking agent is preferably triallyl isocyanurate (TAIC). Triallyl isocyanurate (TAIC) contains two or more unsaturated bonds, enabling it to participate efficiently in the photocrosslinking process. Compared to other auxiliary crosslinking agents such as isopropyl cyanate (TAC), trimethylolpropane triacrylate (TMPTA), and pentaerythritol triallyl propionate (PETA), TAIC not only exhibits superior crosslinking efficiency but also demonstrates better thermal stability and deep penetration, ensuring the uniformity and depth of the crosslinking reaction. The mass concentration of the auxiliary crosslinking agent in the mixture is preferably 1–2 wt%, more preferably 1.5–2 wt%.

[0037] In this invention, the photoinitiator acts as a "trigger" for the crosslinking reaction. Its molecular structure can efficiently absorb ultraviolet light energy, which is then converted into chemical energy to generate highly reactive free radicals. These free radicals not only directly act on the polyethylene molecular chains, causing their segments to break and exposing new reaction sites, but also actively interact with the auxiliary crosslinking agent molecules, further inducing the generation of more free radicals and forming a free radical chain reaction. In this process, the auxiliary crosslinking agent not only accelerates the generation and transmission of free radicals, but also promotes the uniformity and depth of the crosslinking reaction through its unique molecular structure, effectively avoiding the problems of excessive or insufficient local crosslinking. With the continuous collision and recombination between free radicals, the originally two-dimensional linear polyethylene molecular chains gradually transform into a complex three-dimensional network structure. This structural transformation significantly enhances the key properties of the fiber material, such as thermal stability, mechanical strength, and chemical corrosion resistance.

[0038] In this invention, the blending of the polyethylene raw material, photoinitiator and auxiliary crosslinking agent can be either solution blending or dry blending.

[0039] The solution blending includes the following steps:

[0040] The polyethylene raw material, photoinitiator, and auxiliary crosslinking agent were stirred in anhydrous ethanol in the dark to ensure the stability of the photosensitive components. Then, the anhydrous ethanol was removed by vacuum distillation at 55°C to promote the uniform distribution of BP and TAIC molecules in the polyethylene raw material matrix, resulting in a mixture.

[0041] Specifically, firstly, the required mass of BP and TAIC is accurately weighed under strictly light-protected conditions. Secondly, they are dissolved in a slight excess of anhydrous ethanol solvent in a flask lined with aluminum foil to completely isolate them from light. Next, polyethylene granules are finely pulverized into powder, and an appropriate amount is accurately weighed and added to the flask. Subsequently, the mixture is thoroughly stirred at room temperature for half an hour to ensure that the components are initially evenly dispersed. Finally, to further promote deep mixing between BP, TAIC, and the polyethylene powder, the stirred mixture is transferred to an oil bath at 55°C for vacuum distillation for 2 hours. During this process, the ethanol solvent is effectively removed, and BP and TAIC molecules are fully penetrated and evenly distributed in the polyethylene powder. This step not only provides excellent light conditions for subsequent UV crosslinking but also significantly improves the uniformity and efficiency of the crosslinking reaction, ensuring that the polyethylene fiber exhibits superior overall performance after crosslinking modification.

[0042] The preferred dry-mixing method includes the following steps:

[0043] The polyethylene material is crushed to increase its surface area, resulting in polyethylene particles. Then, the polyethylene particles, photoinitiator, and auxiliary crosslinking agent are stirred and mixed to obtain a mixture.

[0044] After obtaining the mixture, the present invention performs melt spinning on the mixture to obtain polyethylene fibers.

[0045] In this invention, the melt spinning temperature is preferably 150–200°C, more preferably 160–180°C. At this spinning temperature, both the polymer melt state and the activity of the crosslinking agent are ensured. The molten polyethylene mixture is extruded from the spinneret and wound and collected at a constant rate, maintaining light-protected conditions throughout the process to prevent pre-crosslinking effects.

[0046] After obtaining polyethylene fibers, the present invention stretches and weaves the polyethylene fibers to obtain polyethylene fiber fabric.

[0047] In this invention, the stretching ratio is preferably 1 to 4 times, more preferably 2 to 3 times; the weaving is a commonly used manufacturing method in the art, and will not be described in detail here.

[0048] After obtaining the polyethylene fiber fabric, the present invention further irradiates it to induce cross-linking. The preferred intensity of the ultraviolet irradiation is 1500–2500 mW / cm². 2 More preferably, it is 1800–2200 mW / cm 2 For example, 1500mW / cm 2 1600mW / cm 2 1700mW / cm 2 1800mW / cm 2 1900mW / cm 2 2000mW / cm 2 2100mW / cm 2 2200mW / cm 2 2300mW / cm 2 2400mW / cm 2 2500mW / cm 2 Preferably, the value is within the range of any of the above values ​​as the upper or lower limit; the irradiation time of the polyethylene fiber fabric under ultraviolet light is preferably 15 to 60 s, more preferably 20 to 50 s.

[0049] In this invention, LED UV lamps are preferably used as the irradiation source for the ultraviolet irradiation crosslinking. Specifically, although mercury lamps can provide high-intensity ultraviolet radiation, their high energy consumption, significant heat generation, and environmental hazards related to mercury emissions are all detrimental to the sustainability and environmental friendliness of the polyethylene fiber crosslinking process, and are therefore excluded. Metal halide lamps are known for their uniform spectral distribution and high energy conversion efficiency; however, their high purchase cost and relatively short lifespan limit their widespread application in large-scale industrial production, and they are also unsuitable as the light source for this invention. Although tritium lamps have specific applications, their light output intensity is insufficient to meet the requirements of efficient crosslinking of polyethylene fibers, and therefore they are not an ideal choice either. In contrast, LED UV lamps have significant advantages such as excellent energy efficiency, ultra-long lifespan, low heat generation, and environmental friendliness. Their high photoelectric conversion efficiency ensures sufficient ultraviolet energy required for the crosslinking reaction, while avoiding the energy consumption and environmental problems of traditional light sources. More importantly, the surface light source design of the LED ultraviolet lamp perfectly matches the cross-linking requirements of fiber fabric materials, ensuring that the light can evenly and fully illuminate the fiber surface, promoting the uniformity and depth of the cross-linking reaction while ensuring cross-linking efficiency.

[0050] After weaving the fibers into fabric, irradiation crosslinking is performed. This dual crosslinking, both within the fibers and between fiber nodes, ensures the fabric's heat resistance and dimensional stability. Unlike direct irradiation crosslinking followed by spinning, this post-weaving irradiation treatment not only alters the internal structure of the fibers at the fiber level, improving their high-temperature resistance, but also crosslinks the fiber nodes at the inter-fiber level, reinforcing the overall structure and improving dimensional stability. Compared to direct irradiation photoinitiation, the post-weaving irradiation process increases the amount of photoinitiator in the raw material formulation to ensure sufficient active free radicals to initiate the reaction during irradiation control. In terms of production efficiency, it avoids the problems of poor crosslinking effects caused by direct irradiation crosslinking and the high-speed movement of the fibers during winding. Irradiation crosslinking of the woven fabric can ensure sufficient crosslinking at continuous production speeds. For example, in the setting section after weaving, adding ultraviolet lamps to the setting machine oven and achieving a fabric speed of 20 m / min can achieve satisfactory crosslinking results. After weaving fibers into fabric, irradiation cross-linking shortens the overall process time and improves ultraviolet irradiation efficiency, meeting the needs of industrial production. Because fibers are in a state of high-speed movement during actual production, the residence time of the fibers under light source irradiation is too short to guarantee the basic irradiation effect of ultraviolet light. The planar arrangement of fibers after weaving into fabric undoubtedly maximizes the utilization of ultraviolet light energy. Simultaneously, irradiation by a double-sided LED ultraviolet lamp surface light source significantly improves irradiation efficiency. The irradiation time of the fabric under the light source is 15s to 60s, which better matches the fabric's speed in post-processing and meets the needs of industrial production.

[0051] This invention proposes a method to improve the thermal stability of industrialized polyethylene fiber fabrics, aiming to significantly enhance the thermal stability of polyethylene fiber fabrics while greatly improving production efficiency. This method involves precisely controlling the ultraviolet light crosslinking system to irradiate the woven fabric, which not only strengthens the molecular structure of the fibers and promotes the formation of a three-dimensional network structure, but also enhances the interaction forces between fibers, thus achieving a qualitative leap in thermal stability. Its beneficial effects are reflected in three aspects: first, it significantly improves the high-temperature resistance of the fiber fabric, broadening its application fields; second, it enhances the mechanical strength and durability of the fiber fabric, extending its service life; third, it improves processing performance, reducing energy consumption and costs in the production process; and fourth, it increases production efficiency, significantly accelerating the industrialization process. In summary, this treatment method provides strong technical support for the upgrading and industrial application of polyethylene fiber fabrics, and has significant economic and social benefits.

[0052] To further illustrate the present invention, the following detailed description of a method for improving the thermal stability of industrialized polyethylene fiber fabrics provided by the present invention is provided in conjunction with embodiments, but it should not be construed as limiting the scope of protection of the present invention.

[0053] Example 1

[0054] 2 wt% benzophenone (BP) and 1 wt% triallyl isocyanate (TAIC) were blended with polyethylene powder particles, and after melt spinning and stretching, a fabric was manufactured. The fabric was then subjected to a light intensity of 2000 mW / cm². 2 Modified polyethylene fiber fabric was prepared by irradiating and crosslinking the material with an LED ultraviolet lamp light source for 30 seconds.

[0055] The morphology of the polyethylene fiber fabric in Example 1 before and after modification was observed, and the results are as follows: Figure 3 As shown, by Figure 3 It can be seen that the modified fibers have improved regularity and the interrelationship between fibers is also tighter, which effectively enhances the overall heat resistance and dimensional stability of the fabric. In actual use, it also has stronger durability and better performance. At the same time, the modification has no effect on the surface morphology of the fibers.

[0056] Example 2

[0057] 4 wt% benzophenone (BP) and 2 wt% triallyl isocyanurate (TAIC) were blended with polyethylene powder particles, and after melt spinning and stretching, a fabric was manufactured. The fabric was then subjected to a light intensity of 1600 mW / cm². 2 Modified polyethylene fiber fabric was prepared by irradiating and crosslinking the material with an LED ultraviolet lamp light source for 30 seconds.

[0058] Example 3

[0059] 4 wt% benzophenone (BP) and 2 wt% triallyl isocyanurate (TAIC) were blended with polyethylene powder particles, and after melt spinning and stretching, a fabric was manufactured. The fabric was then subjected to a light intensity of 1600 mW / cm². 2 Modified polyethylene fiber fabric was prepared by irradiating and crosslinking the material with an LED ultraviolet lamp light source for 40 seconds.

[0060] Example 4

[0061] 4 wt% benzophenone (BP) and 2 wt% triallyl isocyanate (TAIC) were blended with polyethylene powder particles, and after melt spinning and stretching, a fabric was manufactured. The fabric was then subjected to a light intensity of 2000 mW / cm². 2 Modified polyethylene fiber fabric was prepared by irradiating and crosslinking the material with an LED ultraviolet lamp light source for 30 seconds.

[0062] The degree of crosslinking of the modified polyethylene fiber fabrics prepared in Examples 1 to 4 was measured, and the maximum strain was measured before and after stretching at different temperatures and under different stresses. The dimensional change rate was measured at different temperatures to measure its thermal stability. The creep resistance and thermal stability properties obtained are detailed in Table 1.

[0063] In Table 1, the stress-strain test was performed using a DMA Q800 dynamic thermomechanical analyzer. The mode was DMACreep (creep), and the program was set to start heating from 30℃, increase to 130℃ or 150℃ at a rate of 10℃ / min, hold at that temperature for 1 min, then stretch at the set stress for 5 min, and then relax for 1 min. The strain was recorded during the process and plotted as a curve.

[0064] In Table 1, the thermal stability performance is reflected by the dimensional change rate. The test steps are as follows: After measuring the size of a certain length (100-150mm) of modified polyethylene fiber fabric, the two ends are fixed to a 20*20cm transparent glass plate with clips. Then, the glass plate is placed in an oven at 130℃ or 150℃. After 5 minutes, it is taken out and its length is measured. The dimensional change rate is calculated.

[0065] Table 1. Strain tests of the modified polyethylene fiber fabrics prepared in Examples 1-4.

[0066]

[0067] The test results show that the crosslinking degree of the modified polyethylene fiber fabric is above 70%. Meanwhile, the unmodified polyethylene fiber fabric in the control test broke at 130℃ and 5MPa stress, while the modified polyethylene fiber still exhibits good creep resistance and thermal stability at 130℃ and 150℃. Furthermore, the fabric's movement speed of 10m / min effectively ensures the crosslinking effect, effectively solving the problem of insufficient production speed and addressing industrialization challenges.

[0068] Furthermore, at a high temperature of 130℃, the modified polyethylene fiber fabric showed no significant changes in appearance, while the unmodified polyethylene fiber fabric shrank and became stiffer. At a high temperature of 150℃, the original polyethylene fiber fabric fused and clumped together, while the cross-linked polyethylene fiber fabric showed only minor changes in size and no significant change in appearance.

[0069] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for improving the thermal stability of industrialized polyethylene fiber fabrics, comprising the following steps: A) A mixture is obtained by blending polyethylene raw material, photoinitiator and auxiliary crosslinking agent; The density of the polyethylene raw material is 0.90~0.96 g / cm³. 3 The polyethylene raw material is medium molecular weight polyethylene, and the number average molecular weight of the polyethylene raw material is 100,000 to 500,000. The photoinitiator is benzophenone, and the mass concentration of the photoinitiator in the mixture is 2-4 wt%. The auxiliary crosslinking agent is triallyl isocyanurate, and the mass concentration of the auxiliary crosslinking agent in the mixture is 1~2 wt%. B) The mixture is melt-spun to obtain polyethylene fibers; C) The polyethylene fibers are stretched and woven to obtain a polyethylene fiber fabric; before obtaining the polyethylene fiber fabric, it is produced using ultraviolet-shielded methods. D) The polyethylene fiber fabric is subjected to ultraviolet light irradiation to obtain a modified polyethylene fiber fabric.

2. The method according to claim 1, characterized in that, The blending in step A) is either solution blending or dry blending; The solution blending includes the following steps: The polyethylene raw material, photoinitiator and auxiliary crosslinking agent were stirred in anhydrous ethanol in the dark, and then the anhydrous ethanol was removed by vacuum distillation to obtain a mixture. The dry mixing process includes the following steps: The polyethylene material is crushed to obtain polyethylene particles. Then, the polyethylene particles, photoinitiator, and auxiliary crosslinking agent are stirred and mixed to obtain a mixture.

3. The method according to claim 1, characterized in that, The melt spinning temperature is 150~200℃.

4. The method according to claim 1, characterized in that, In step C), the stretching ratio is 1 to 4 times.

5. The method according to claim 1, characterized in that, The intensity of the ultraviolet irradiation is 1500~2500 mW / cm². 2 The polyethylene fiber fabric is irradiated with ultraviolet light for 15-60 seconds.

6. The method according to claim 1, characterized in that, The modified polyethylene fiber fabric has a gel content >70%.

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