Polyethylene-based composite laid-woven fabric and method of making the same

Abstract

The application relates to the technical field of high polymer materials, and discloses a polyethylene-based composite non-woven fabric and a preparation method thereof.The composite non-woven fabric is prepared by hot pressing of a base material of ultrahigh molecular weight polyethylene fibers and an adhesive, and the adhesive comprises the following raw materials: epoxy resin, functional composite additive, defoaming agent and curing agent.The functional composite additive added in the adhesive can effectively enhance the compactness and cohesion of the adhesive, improve the bonding force with the ultrahigh molecular weight polyethylene fibers, further improve the impact resistance of the composite non-woven fabric, avoid fiber debonding and slippage and tearing when the composite non-woven fabric is impacted, shorten the service life of the non-woven fabric, and simultaneously improve the heat resistance and flame resistance of the adhesive, further improve the safety and reliability of the composite non-woven fabric, widen the application range of the composite non-woven fabric, and have a wide application prospect.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a polyethylene-based composite nonwoven fabric and its preparation method. Background Technology

[0002] Nonwoven fabric, also known as unidirectional fabric, is lightweight, high-strength, and has excellent protective properties. It consists of two parts: a matrix composed of adhesives and high-performance fibers. Nonwoven fabric is typically made by unidirectionally parallel fibers bonded together with thermoplastic resin, with the interlayer layers crossed, and then pressed with thermoplastic resin. It has a wide range of applications, such as bulletproof materials, stab and cut resistant products, aerospace, sporting goods, filter materials, thermal insulation materials, and electromagnetic shielding materials. Therefore, the research and modification of nonwoven fabric has important practical significance.

[0003] High-performance fibers used in nonwoven fabrics generally include ultra-high molecular weight polyethylene (UHMWPE) fibers, aramid fibers, and carbon fibers. Among them, UHMWPE fibers have excellent chemical resistance, maintaining stability even in harsh chemical environments. They also have low density, meeting lightweight requirements, good wear resistance, are not easily damaged, have a regular structure, are easy to crystallize, and are easy to process. Therefore, they can be used as a material for preparing nonwoven fabrics. Common adhesive matrices for nonwoven fabrics generally include polyurethane, polyethylene, polypropylene, ethylene-propylene copolymer, polybutadiene, natural rubber, epoxy resin, and styrene-butadiene rubber. Epoxy resin has good adhesion to UHMWPE fibers, creating a tight structure between the fiber and the adhesive. After curing, it can withstand greater loads and has low curing shrinkage, effectively reducing dimensional changes in the nonwoven fabric and maintaining stability. Epoxy resin also has good processability, but... Epoxy resin as an adhesive matrix for non-woven fabrics still has shortcomings. Epoxy resin has poor impact resistance, which may cause the non-woven fabric to break when subjected to external impact. At the same time, epoxy resin has poor heat resistance and flame retardancy, limiting the application of non-woven fabrics. Patent CN103015041B discloses a method for preparing a fumed silica-reinforced ultra-high molecular weight polyethylene fiber composite non-woven fabric. By adding fumed silica, more energy generated when a bullet impacts the fiber can be absorbed, improving bulletproof performance and overall heat resistance. However, this patent does not consider the poor flame retardancy of the ultra-high molecular weight polyethylene fiber composite non-woven fabric, which would limit its application. Therefore, this invention provides a polyethylene-based composite non-woven fabric with excellent impact resistance, heat resistance, and flame retardancy, showing broad application prospects. Summary of the Invention

[0004] In order to solve the problems mentioned in the background art, the purpose of this invention is to provide a polyethylene-based composite nonwoven fabric and its preparation method.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A composite nonwoven fabric based on polyethylene is made by hot pressing ultra-high molecular weight polyethylene fibers and adhesives; the adhesives include the following raw materials in parts by weight: 30-45 parts epoxy resin, 3-6 parts functional composite additives, 1-4 parts defoamer, and 9-12 parts curing agent.

[0007] Furthermore, the preparation method of the functional composite additive is as follows:

[0008] Step 1: Preparation of modified vermiculite

[0009] Vermiculite was dispersed in dimethyl sulfoxide to form a uniform suspension. Halogenated epoxy modifier and catalyst were added, the temperature was raised to 70-78℃, and the reaction was stirred for 3-5 hours. After cooling to room temperature, the mixture was filtered, washed, and dried to obtain modified vermiculite.

[0010] By adopting the above technical solution, the hydroxyl groups on the surface of vermiculite can react with the epoxy groups in the structure of the halogenated epoxy modifier under the action of a catalyst to obtain modified vermiculite with halogen substituents and hydroxyl groups generated by ring opening.

[0011] Step 2: Preparation of modified rubber

[0012] Polysulfide rubber was added to tetrahydrofuran and stirred evenly. Then, diethyl allyl phosphate and a photoinitiator were added. The system was irradiated under a UV lamp for 1-2 hours. The solvent was evaporated and the material was discharged to obtain the modified rubber.

[0013] By adopting the above technical solution, the polysulfide rubber structure contains active mercapto groups, which can undergo a mercapto-alkene click reaction with the alkenyl groups in the allyl phosphate structure under the irradiation of photoinitiator and ultraviolet lamp to obtain modified rubber.

[0014] Step 3: Preparation of functional composite additives

[0015] Modified vermiculite was added to N,N-dimethylformamide and dispersed evenly. Nitrogen gas was introduced for protection, and modified rubber was added. The temperature was raised to 65-70℃ and stirred evenly. Then, an alkaline catalyst was added, and the temperature was raised to 70-80℃. The reaction was carried out under stirring for 4-6 hours. After cooling to room temperature, the product was collected, washed, and dried to obtain the functional composite additive.

[0016] By adopting the above technical solution, the halogen substituents on the surface of modified vermiculite can react with the thiol groups in the modified rubber structure under the action of an alkaline catalyst to obtain a functional composite additive.

[0017] Furthermore, in step one, the halogenated epoxy modifier is epichlorohydrin or epibromopropane.

[0018] Furthermore, in step one, the catalyst is boron trifluoride diethyl ether.

[0019] Furthermore, in step two, the photoinitiator is benzoin dimethyl ether or benzoin ethyl ether.

[0020] Furthermore, in step three, the alkaline catalyst is any one of potassium carbonate, sodium carbonate, or potassium hydroxide.

[0021] Furthermore, the curing agent is diaminodiphenylmethane or diethylenetriamine; the defoamer is polysiloxane.

[0022] A method for preparing a polyethylene-based composite nonwoven fabric includes the following steps:

[0023] Step 1: By weight, add epoxy resin, functional composite additives, defoamer and curing agent to a high-speed mixer. Stir and mix evenly for 30-60 minutes at a stirring speed of 200-500 r / min to obtain adhesive. Add the adhesive to the glue tank.

[0024] Step 2: Immerse the ultra-high molecular weight polyethylene fiber in an ethanol solution with a mass fraction of 30-35% to clean it, remove impurities, dry it, spread it evenly, transfer it to the glue tank by a traction machine, apply adhesive by roller, dry it by a dryer, and then wind it up by a winding machine to obtain ultra-high molecular weight polyethylene fiber sheets.

[0025] Step 3: After cutting the ultra-high molecular weight polyethylene fiber sheets, they are orthogonally stacked and then heated and pressed to form a composite non-woven fabric.

[0026] Furthermore, in the second step, the roller coating amount of the adhesive is 1-1.5 g / cm³. 2 .

[0027] Furthermore, in the third step, during the heating and pressurization, the temperature is set to 90-110℃, the pressure is set to 10-15MPa, and the hot-pressing time is 15-30min.

[0028] The beneficial effects of this invention are:

[0029] (1) The functional composite additive prepared in this invention improves the compatibility between vermiculite and epoxy resin by organically modifying vermiculite, promoting uniform dispersion of vermiculite in epoxy resin, reducing the probability of vermiculite agglomeration, and enhancing the adhesion between vermiculite and epoxy resin. When subjected to external impact, stress transmission points are formed, effectively transmitting stress and bearing load. Vermiculite has a layered structure, and when the interlayer structure is damaged during impact, it absorbs a large amount of impact energy, which can improve impact resistance. After grafting with modified rubber, the functional composite additive is further enhanced. The polysulfide rubber in the functional composite additive can absorb and disperse external impact and stress, prevent crack propagation, and play a role in toughening and improving impact resistance. At the same time, the hydroxyl groups in the functional composite additive can participate in the curing of epoxy resin, cross-link with the epoxy resin molecular chain, form a polymer network structure, enhance the density of the structure, enhance the cohesive force of the adhesive, and improve the bonding force between the adhesive and ultra-high molecular weight polyethylene fiber. This significantly improves the impact resistance of the non-woven fabric, preventing fiber detachment and slippage and tearing when subjected to impact, thus shortening the service life of the non-woven fabric.

[0030] (2) The layered structure of vermiculite in the functional composite additive can form a physical barrier layer, effectively slowing down heat transfer and providing heat insulation. After the functional composite additive crosslinks with the epoxy resin molecular chain, it improves the heat resistance of the epoxy resin and avoids the decrease in adhesive adhesion in high-temperature environments, which would lead to a decrease in the performance of the nonwoven fabric. In addition, the sulfur element in the functional composite additive, which has flame retardant properties, also introduces diethyl phosphate, which has flame retardant properties, to avoid the migration of small molecule flame retardant substances. Furthermore, it can quickly form a dense carbon layer that is oxygen-barrier and heat-insulating during combustion, preventing the spread of fire. The layered structure of vermiculite can work together to provide heat insulation, oxygen barrier, and flame retardancy, protecting life and property safety and improving the safety and reliability of the nonwoven fabric.

[0031] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is the infrared spectrum of the modified rubber in this invention;

[0034] Figure 2 The images show scanning electron microscope (SEM) images of vermiculite and functional composite additives in this invention, where (A) represents vermiculite and (B) represents the functional composite additives. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] The preparation methods of the functional composite additives in the following examples and comparative examples are shown below:

[0037] Step 1: Preparation of modified vermiculite

[0038] 4g of vermiculite was dispersed in dimethyl sulfoxide to form a uniform suspension. 2.6g of epichlorohydrin and 0.1g of boron trifluoride ether were added. The temperature was raised to 75°C and the mixture was stirred for 4 hours. After cooling to room temperature, the mixture was filtered, washed, and dried to obtain modified vermiculite.

[0039] Step 2: Preparation of modified rubber

[0040] 6g of polysulfide rubber was added to tetrahydrofuran and stirred evenly. Then, 2.3g of allyl phosphate diethyl ester and 0.3g of benzoin dimethyl ether were added. The system was irradiated under a UV lamp for 1 hour, the solvent was evaporated and removed, and the modified rubber was obtained.

[0041] Samples were prepared using the potassium bromide tableting method, and the modified rubber was subjected to infrared spectroscopy using a Fourier transform infrared spectrometer. Figure 1 As shown in the figure, analysis reveals that in the infrared spectrum of the modified rubber, 2560 cm⁻¹ -1 An absorption peak for SH appeared at 1235 cm⁻¹. -1 An absorption peak for P=O appeared at 1186 cm⁻¹. -1 A CSC absorption peak appeared at 1088 cm⁻¹. -1 An absorption peak for COC appeared at 1025 cm⁻¹. -1 An absorption peak for PO appeared at that location.

[0042] Step 3: Preparation of functional composite additives

[0043] Add 3.2g of modified vermiculite to N,N-dimethylformamide, disperse evenly, and then purge with nitrogen. Add 5.8g of modified rubber, raise the temperature to 70℃, stir evenly, add 0.8g of potassium carbonate, raise the temperature to 76℃, and keep the reaction at this temperature for 5 hours with stirring. After cooling to room temperature, collect the product, wash and dry it to obtain the functional composite additive.

[0044] Morphological analysis of vermiculite and functional composite additives was performed using a Hitach i S-4700 scanning electron microscope. Figure 2 It can be seen that (A) is vermiculite and (B) is a functional composite additive. Vermiculite has a relatively smooth layered structure, while the functional composite additive has an uneven surface and a partially coated structure. It is relatively rough because the modified rubber reacts successfully with vermiculite and is coated on the vermiculite surface.

[0045] Example 1

[0046] Preparation of composite nonwoven fabric

[0047] Step 1: Add 30g of epoxy resin, 3g of functional composite additive, 1g of polysiloxane defoamer and 9g of diaminodiphenylmethane to a high-speed mixer. Mix evenly for 30 minutes at a stirring speed of 200r / min to obtain an adhesive. Add the adhesive to the glue tank.

[0048] Step 2: Immerse the ultra-high molecular weight polyethylene fibers in a 30% ethanol solution to clean them, remove impurities, dry them, spread them evenly, transfer them to the adhesive tank using a traction machine, and roll-coat them with adhesive at a rate of 1 g / cm³. 2 After being dried in a dryer, the fibers are then wound up in a winding machine to obtain ultra-high molecular weight polyethylene fiber sheets.

[0049] Step 3: After cutting the ultra-high molecular weight polyethylene fiber sheets, lay them orthogonally, and then heat and press them at 90℃ and 10MPa for 15 minutes to produce a composite non-woven fabric.

[0050] Example 2

[0051] Step 1: Add 35g of epoxy resin, 4g of functional composite additive, 2g of polysiloxane defoamer and 10g of diaminodiphenylmethane to a high-speed mixer. Mix evenly for 40 minutes at a stirring speed of 300r / min to obtain an adhesive. Add the adhesive to the glue tank.

[0052] Step 2: Immerse the ultra-high molecular weight polyethylene fibers in a 32% ethanol solution to clean them, remove impurities, dry them, evenly lay them into fibers, transfer them to the adhesive tank using a traction machine, and roll-coat the adhesive at a rate of 1.2 g / cm³. 2 After being dried in a dryer, the fibers are then wound up in a winding machine to obtain ultra-high molecular weight polyethylene fiber sheets.

[0053] Step 3: After cutting the ultra-high molecular weight polyethylene fiber sheets, lay them orthogonally, and then heat and press them at 95℃ and 12MPa for 20 minutes to produce a composite non-woven fabric.

[0054] Example 3

[0055] Step 1: Add 38g of epoxy resin, 5g of functional composite additive, 2g of polysiloxane defoamer and 10g of diaminodiphenylmethane to a high-speed mixer. Mix evenly for 50 minutes at a stirring speed of 400r / min to obtain an adhesive. Add the adhesive to the glue tank.

[0056] Step 2: Immerse the ultra-high molecular weight polyethylene fibers in a 34% ethanol solution to clean them, remove impurities, dry them, evenly lay them into fibers, transfer them to the adhesive tank using a traction machine, and roll-coat the adhesive at a rate of 1.4 g / cm³. 2 After being dried in a dryer, the fibers are then wound up in a winding machine to obtain ultra-high molecular weight polyethylene fiber sheets.

[0057] Step 3: After cutting the ultra-high molecular weight polyethylene fiber sheets, lay them orthogonally, and then heat and press them at 100℃ and 14MPa for 25 minutes to produce a composite non-woven fabric.

[0058] Example 4

[0059] Step 1: Add 45g of epoxy resin, 6g of functional composite additive, 4g of polysiloxane defoamer and 12g of diaminodiphenylmethane to a high-speed mixer. Mix evenly for 60 minutes at a stirring speed of 500r / min to obtain an adhesive. Add the adhesive to the glue tank.

[0060] Step 2: Immerse the ultra-high molecular weight polyethylene fibers in a 35% ethanol solution to clean them, remove impurities, dry them, evenly lay them into fibers, transfer them to the adhesive tank using a traction machine, and roll-coat the adhesive at a rate of 1.5 g / cm³. 2 After being dried in a dryer, the fibers are then wound up in a winding machine to obtain ultra-high molecular weight polyethylene fiber sheets.

[0061] Step 3: After cutting the ultra-high molecular weight polyethylene fiber sheets, lay them orthogonally, and then heat and press them at 110℃ and 15MPa for 30 minutes to produce a composite non-woven fabric.

[0062] Comparative Example 1

[0063] Step 1: Add 38g epoxy resin, 5g vermiculite, 2g polysiloxane defoamer and 10g diaminodiphenylmethane to a high-speed mixer. Mix evenly for 50 minutes at a stirring speed of 400r / min to obtain an adhesive. Add the adhesive to the glue tank.

[0064] Step 2: Immerse the ultra-high molecular weight polyethylene fibers in a 34% ethanol solution to clean them, remove impurities, dry them, evenly lay them into fibers, transfer them to the adhesive tank using a traction machine, and roll-coat the adhesive at a rate of 1.4 g / cm³. 2 After being dried in a dryer, the fibers are then wound up in a winding machine to obtain ultra-high molecular weight polyethylene fiber sheets.

[0065] Step 3: After cutting the ultra-high molecular weight polyethylene fiber sheets, lay them orthogonally, and then heat and press them at 100℃ and 14MPa for 25 minutes to produce a composite non-woven fabric.

[0066] Comparative Example 2

[0067] Step 1: Add 38g of epoxy resin, 5g of polysulfide rubber, 2g of polysiloxane defoamer and 10g of diaminodiphenylmethane to a high-speed mixer. Mix evenly for 50 minutes at a stirring speed of 400r / min to obtain an adhesive. Add the adhesive to the glue tank.

[0068] Step 2: Immerse the ultra-high molecular weight polyethylene fibers in a 34% ethanol solution to clean them, remove impurities, dry them, evenly lay them into fibers, transfer them to the adhesive tank using a traction machine, and roll-coat the adhesive at a rate of 1.4 g / cm³. 2 After being dried in a dryer, the fibers are then wound up in a winding machine to obtain ultra-high molecular weight polyethylene fiber sheets.

[0069] Step 3: After cutting the ultra-high molecular weight polyethylene fiber sheets, lay them orthogonally, and then heat and press them at 100℃ and 14MPa for 25 minutes to produce a composite non-woven fabric.

[0070] Comparative Example 3

[0071] Step 1: Add 38g of epoxy resin, 5g of allyl phosphate diethyl ester, 2g of polysiloxane defoamer and 10g of diaminodiphenylmethane to a high-speed mixer. Mix evenly for 50 minutes at a stirring speed of 400r / min to obtain an adhesive. Add the adhesive to the glue tank.

[0072] Step 2: Immerse the ultra-high molecular weight polyethylene fibers in a 34% ethanol solution to clean them, remove impurities, dry them, evenly lay them into fibers, transfer them to the adhesive tank using a traction machine, and roll-coat the adhesive at a rate of 1.4 g / cm³. 2 After being dried in a dryer, the fibers are then wound up in a winding machine to obtain ultra-high molecular weight polyethylene fiber sheets.

[0073] Step 3: After cutting the ultra-high molecular weight polyethylene fiber sheets, lay them orthogonally, and then heat and press them at 100℃ and 14MPa for 25 minutes to produce a composite non-woven fabric.

[0074] Comparative Example 4

[0075] Step 1: Add 38g of epoxy resin, 2g of polysiloxane defoamer and 10g of diaminodiphenylmethane to a high-speed mixer. Mix evenly for 50 minutes at a stirring speed of 400r / min to obtain an adhesive. Add the adhesive to the glue tank.

[0076] Step 2: Immerse the ultra-high molecular weight polyethylene fibers in a 34% ethanol solution to clean them, remove impurities, dry them, evenly lay them into fibers, transfer them to the adhesive tank using a traction machine, and roll-coat the adhesive at a rate of 1.4 g / cm³. 2 After being dried in a dryer, the fibers are then wound up in a winding machine to obtain ultra-high molecular weight polyethylene fiber sheets.

[0077] Step 3: After cutting the ultra-high molecular weight polyethylene fiber sheets, lay them orthogonally, and then heat and press them at 100℃ and 14MPa for 25 minutes to produce a composite non-woven fabric.

[0078] Performance testing

[0079] The composite nonwoven fabrics prepared in Examples 1-4 and Comparative Examples 1-4 were used to prepare samples that met the testing requirements. The V50 value of the samples was tested according to GB / T 32497-2016 standard. The samples were left under natural conditions for 6 months, and the limiting oxygen index was tested according to GB / T 5454-1997 standard. The samples were then treated at 115℃ for 800 hours, and changes in their appearance were observed. The test results are shown in the table below:

[0080] V50 value (m / s) Limiting oxygen index (%) Changes during high-temperature treatment Example 1 590 28.3 No change Example 2 593 28.5 No change Example 3 598 29.2 No change Example 4 595 28.8 No change Comparative Example 1 570 18.4 Slightly yellowing Comparative Example 2 566 19.6 Severe yellowing Comparative Example 3 503 20.1 Severe yellowing and wrinkling Comparative Example 4 492 16.3 Severe yellowing and wrinkling

[0081] As shown in the table above, the composite nonwoven fabrics prepared in Examples 1-4 of this invention have excellent impact resistance, flame retardancy, and heat resistance. In Comparative Example 1, vermiculite was added to the adhesive without modification, resulting in agglomeration and limited improvement in impact resistance and heat resistance, as well as poor flame retardancy. In Comparative Example 2, polysulfide rubber was added to the adhesive, resulting in poor impact resistance, heat resistance, and flame retardancy. In Comparative Example 3, diethyl allyl phosphate was added to the adhesive, and the small molecule flame retardant was prone to migration, leading to a decrease in flame retardancy and poor impact resistance and heat resistance. In Comparative Example 4, no functional composite additives were added during adhesive preparation, resulting in poor test results.

[0082] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A composite nonwoven fabric based on polyethylene, characterized in that, It is made of ultra-high molecular weight polyethylene fiber and adhesive by hot pressing; the adhesive includes the following raw materials in parts by weight: 30-45 parts epoxy resin, 3-6 parts functional composite additives, 1-4 parts defoamer, and 9-12 parts curing agent; The preparation method of the functional composite additive is as follows: Step 1: Preparation of modified vermiculite Vermiculite was dispersed in dimethyl sulfoxide to form a uniform suspension. Halogenated epoxy modifier and catalyst were added, the temperature was raised to 70-78℃, and the reaction was stirred for 3-5 hours. After cooling to room temperature, the mixture was filtered, washed, and dried to obtain modified vermiculite. Step 2: Preparation of modified rubber Polysulfide rubber was added to tetrahydrofuran and stirred evenly. Then, diethyl allyl phosphate and a photoinitiator were added. The system was irradiated under a UV lamp for 1-2 hours. The solvent was evaporated and the material was discharged to obtain the modified rubber. Step 3: Preparation of functional composite additives Modified vermiculite was added to N,N-dimethylformamide and dispersed evenly. Nitrogen gas was introduced for protection, modified rubber was added, the temperature was raised to 65-70℃, and the mixture was stirred evenly. Then, an alkaline catalyst was added, and the temperature was raised to 70-80℃. The mixture was stirred and kept at this temperature for 4-6 hours. After cooling to room temperature, the product was collected, washed, and dried to obtain the functional composite additive. The halogenated epoxy modifier is epichlorohydrin or epibromopropane.

2. The polyethylene-based composite nonwoven fabric according to claim 1, characterized in that, In step one, the catalyst is boron trifluoride diethyl ether.

3. The polyethylene-based composite nonwoven fabric according to claim 1, characterized in that, In step two, the photoinitiator is benzoin dimethyl ether or benzoin ethyl ether.

4. The polyethylene-based composite nonwoven fabric according to claim 1, characterized in that, In step three, the alkaline catalyst is any one of potassium carbonate, sodium carbonate, or potassium hydroxide.

5. The polyethylene-based composite nonwoven fabric according to claim 1, characterized in that, The curing agent is diaminodiphenylmethane or diethylenetriamine; the defoamer is polysiloxane.

6. A method for preparing a polyethylene-based composite nonwoven fabric as described in claim 1, characterized in that, Includes the following steps: Step 1: By weight, add epoxy resin, functional composite additives, defoamer and curing agent to a high-speed mixer. Stir and mix evenly for 30-60 minutes at a stirring speed of 200-500 r / min to obtain adhesive. Add the adhesive to the glue tank. Step 2: Immerse the ultra-high molecular weight polyethylene fiber in an ethanol solution with a mass fraction of 30-35% to clean it, remove impurities, dry it, spread it evenly, transfer it to the glue tank by a traction machine, apply adhesive by roller, dry it by a dryer, and then wind it up by a winding machine to obtain ultra-high molecular weight polyethylene fiber sheets. Step 3: After cutting the ultra-high molecular weight polyethylene fiber sheets, they are orthogonally stacked and then heated and pressed to form a composite non-woven fabric.

7. The method for preparing a polyethylene-based composite nonwoven fabric according to claim 6, characterized in that, In the second step, the roller coating amount of the adhesive is 1-1.5 g / cm³. 2 .

8. The method for preparing a polyethylene-based composite nonwoven fabric according to claim 6, characterized in that, In the third step, during the heating and pressurization, the temperature is set to 90-110℃, the pressure is set to 10-15MPa, and the hot pressing time is 15-30min.

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