Green adhesive removing agent and adhesive removing method for ultra-high molecular weight polyethylene fiber leftovers

Abstract

The invention belongs to the technical field of high polymer material recovery, and particularly relates to an ultra-high molecular weight polyethylene fiber leftover green degumming agent and a degumming method. The green adhesive remover for the ultra-high molecular weight polyethylene fiber leftovers comprises the following components: 60-80 parts of biodegradable ionic liquid, 5-10 parts of catalyst organic alkali and 10-35 parts of deionized water. The degumming agent is green, environment-friendly and pollution-free, and can be repeatedly used; degumming conditions are mild, operation is simple, and the degumming rate is gt; the gel content of the recovered fibers is lower than 2wt%, and high-value recovery of the ultra-high molecular weight polyethylene fibers is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of polymer material recycling technology, specifically relating to a green degumming agent and method for ultra-high molecular weight polyethylene fiber waste. Background Technology

[0002] Ultra-high molecular weight polyethylene (UHMWPEF) fiber is made of polyethylene with a molecular weight between 1 million and 5 million. Along with carbon fiber and aramid fiber, it is considered one of the world's three major functional fibers. It possesses numerous excellent properties, including ultra-high strength, ultra-high modulus, low density, wear resistance, low-temperature resistance, UV resistance, shielding properties, good flexibility, high impact energy absorption, and resistance to strong acids, alkalis, and chemical corrosion. It is widely used in protective clothing, ropes, fishing nets, sporting goods, and high-end industrial applications. With the increasing market demand for UHMWPE fiber, the waste generated in its production and application is also gradually increasing. This waste is difficult to degrade naturally, and landfilling and incineration cause serious environmental pollution. Currently, most waste is sealed for disposal, occupying company space and wasting resources. Therefore, the treatment and recycling of UHMWPE fiber waste urgently needs to be addressed.

[0003] Existing chemical recycling technologies involve the pyrolysis and liquefaction of ultra-high molecular weight polyethylene (UHMWPE) fibers into new industrial products such as detergents, degreasers, paints, and specialty waxes. However, chemical recycling is technically challenging and costly. Mechanically crushing UHMWPE fiber waste for use as filler in rubber and plastic products is a highly promising recycling method. However, waste materials from UHMWPE fiber protective products often contain polar polymer impurities. These polymers adhere to the fiber surface (referred to as "adhesive"), acting as binders and restricting fiber bundle movement, thereby further improving the impact resistance, bulletproof, and puncture resistance of protective products. The adhesive on the fiber surface has the opposite polarity to UHMWPE, resulting in significant performance differences. When mixed with fiber fragments, it degrades the processing and mechanical properties of downstream products, hindering the high-value recycling and reuse of UHMWPE fibers.

[0004] Green adhesive remover is a non-toxic, biodegradable, and environmentally friendly cleaning agent used to remove adhesive from the surface of ultra-high molecular weight polyethylene fibers, ensuring efficient degumming while protecting fiber performance and reducing environmental impact. Green adhesive remover needs to meet the following design principles: (1) Non-toxic or low toxicity: avoid using highly toxic solvents such as benzene and halogenated hydrocarbons; (2) Biodegradable: the components should be easily biodegradable and not cause secondary pollution; (3) Highly efficient adhesive removal: have good dissolving or peeling ability for adhesive on fiber surfaces; (4) Mild operating conditions: the adhesive removal effect can be achieved without excessively high temperatures, saving energy.

[0005] Therefore, there is an urgent need for a green adhesive remover for ultra-high molecular weight polyethylene (UHMWPE), which can achieve efficient adhesive removal of UHMWPE fiber waste by selecting recyclable components and relying on the synergistic effect between the components. Summary of the Invention

[0006] The purpose of this invention is to provide a green degumming agent and method for ultra-high molecular weight polyethylene fiber waste. This invention uses a biodegradable ionic liquid as a solvent and an organic base as a catalyst. Preferably, 1-hexyl-3-methylpyridine chloride and 1-methyl acetate-3-methylimidazolium chloride are used as the compound ionic liquid, and preferably 1,8-diazabicyclo[5.4.0]undec-7-ene and 1,1,3,3-tetramethylguanidine are used as the compound organic base, thereby obtaining a green degumming agent. This agent is then applied to the degumming process of ultra-high molecular weight polyethylene fiber waste, achieving a good degumming effect.

[0007] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of the present invention provides a green descaling agent for ultra-high molecular weight polyethylene fiber waste, comprising the following components by weight: 60-80 parts solvent, 5-10 parts catalyst and 10-35 parts deionized water; The solvent is a biodegradable ionic liquid; the catalyst is an organic base.

[0008] As a preferred embodiment, the weight percentage of the solvent ionic liquid in this invention can be 60 parts, 65 parts, 70 parts, 75 parts, or 80 parts, etc.

[0009] As a preferred embodiment, the organic base catalyst in this invention can be in the following weight proportions: 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts, etc.

[0010] As a preferred embodiment, the weight percentage of the deionized water in this invention can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, or 35 parts, etc.

[0011] As a preferred embodiment, the biodegradable ionic liquid is selected from one of 1-hexyl-3-methylpyridine chloride, 1-hexyl-3-methylpyridine bromide, 1-octyl-3-methylpyridine chloride, 1-octyl-3-methylpyridine bromide, 1-methyl acetate-3-methylimidazolium chloride, and 1-methyl acetate-3-methylimidazolium bromide.

[0012] The solvent ionic liquid of this invention, with its small molecular size, low surface tension, and polarity, can penetrate into the cross-linked network or molecular chain gaps of residual adhesive on the surface of ultra-high molecular weight polyethylene fibers. Subsequently, the ionic liquid molecules interact with the polymer chains, increasing the distance between the polymer chains and causing the entire adhesive layer to expand in volume. This greatly weakens the cohesive force of the residual adhesive and the adhesion force between the residual adhesive and the polyethylene fibers, thereby achieving the purpose of adhesive removal.

[0013] As a preferred embodiment, the biodegradable ionic liquid is 1-hexyl-3-methylpyridine chloride and 1-methyl acetate-3-methylimidazolium chloride.

[0014] As a preferred embodiment, the mass ratio of 1-hexyl-3-methylpyridine chloride to 1-methyl acetate-3-methylimidazolium chloride is (2~3):1; preferably, the mass ratio can be 2:1, 2.2:1, 2.4:1, 2.6:1, 2.8:1 or 3:1.

[0015] The ionic liquid of this invention is preferably a combination of 1-hexyl-3-methylpyridine chloride and 1-methyl acetate-3-methylimidazolium chloride. 1-Methyl acetate-3-methylimidazolium chloride possesses high polarity and strong hydrogen bond acceptance, exhibiting good swelling or dissolving effects on polymer residues with polar functional groups. Simultaneously, the planar conjugated structure of the imidazole cation can undergo π-π stacking with structures such as benzene rings in the adhesive on the fiber surface, effectively inserting into and loosening the polymer chains. 1-Hexyl-3-methylpyridine chloride has good wetting and peeling abilities against non-polar or weakly polar organic matter, enhancing spreadability on ultra-high molecular weight polyethylene fibers by reducing the system's surface tension. In this invention, 1-methyl acetate-3-methylimidazolium chloride first undergoes initial penetration and swelling, while the molecular chains of 1-hexyl-3-methylpyridine chloride then enter the opened gaps, further disrupting interchain forces to achieve peeling. The synergistic effect of both enhances the adhesive removal efficiency.

[0016] In addition, pyridine salts with long-chain alkyl groups (such as hexyl and octyl) and imidazole salts with ester groups have good biodegradability, overcoming the problem that commonly used ionic liquids with 1-butyl-3-methylimidazolium as the core have poor biodegradability and will remain in the environment after final discharge or accidental leakage, causing environmental pollution.

[0017] As a preferred embodiment, the organic base is selected from one or more of 1,8-diazabicyclo[5.4.0]undec-7-ene, 1,5-diazabicyclo[4.3.0]non-5-ene, and 1,1,3,3-tetramethylguanidine.

[0018] The organic base of this invention can break the polar chemical bonds of the adhesive on the fiber surface through alkaline active sites, and at the same time assist in penetration and swelling, destroy the internal structure of the adhesive layer, reduce the adhesion to the polyethylene fiber interface, and achieve peeling or dissolution of the adhesive layer. It also has excellent compatibility with non-polar ultra-high molecular weight polyethylene fibers.

[0019] As a preferred embodiment, the organic base is 1,8-diazabicyclo[5.4.0]undec-7-ene and 1,1,3,3-tetramethylguanidine.

[0020] As a preferred embodiment, the mass ratio of 1,8-diazabicyclo[5.4.0]undec-7-ene to 1,1,3,3-tetramethylguanidine is (1~3):1. Preferably, the mass ratio can be 1:1, 1.5:1, 2:1, 2.5:1 or 3:1.

[0021] This invention uses a compound of 1,8-diazabicyclo[5.4.0]undec-7-ene and 1,1,3,3-tetramethylguanidine. The bicyclic structure of 1,8-diazabicyclo[5.4.0]undec-7-ene provides a unique spatial environment that selectively attacks the crosslinking points of adhesive residue on the fiber surface. The tri-nitrogen conjugated structure of 1,1,3,3-tetramethylguanidine enhances the adsorption and activation of polar groups. The two work synergistically to break down the crosslinking network of residual adhesive, which not only allows the residual adhesive to be peeled off from the surface of polyethylene fibers, but also chemically degrades it into low molecular weight oligomers or monomers, thereby completely eliminating its stickiness and making it easy to clean and remove from the fiber surface. The synergistic effect of the two improves the adhesive removal efficiency.

[0022] A second aspect of the present invention provides a method for removing adhesive, comprising the following steps: Step S1: Prepare the green adhesive remover for ultra-high molecular weight polyethylene fiber waste as described in the first aspect; Step S2: Completely immerse the ultra-high molecular weight polyethylene fiber waste in the adhesive remover described in step S1; Step S3: Transfer to an ultrasonic cleaner for degumming to obtain degummed ultra-high molecular weight polyethylene fibers.

[0023] As a preferred embodiment, the mass ratio of the desiccant to the ultra-high molecular weight polyethylene fiber waste in step S2 is (100~1000):1; preferably, the mass ratio can be 100:1, 200:1, 300:1, 400:1, 500:1, 600:1, 700:1, 800:1, 900:1 or 1000:1.

[0024] As a preferred embodiment, the power of the ultrasonic cleaner in step S3 is 20~40 KHz; preferably, the power can be 20 KHz, 25 KHz, 30 KHz, 35 KHz or 40 KHz.

[0025] As a preferred embodiment, the temperature for the adhesive removal process in step S3 is 50~90℃; preferably, the temperature can be 50℃, 65℃, 60℃, 65℃, 70℃, 75℃, 80℃, 85℃ or 90℃.

[0026] As a preferred embodiment, the ultrasonic vibration time for the adhesive removal process in step S3 is 30~240 min; preferably, the vibration time can be 30 min, 60 min, 120 min, 180 min or 240 min.

[0027] As a preferred embodiment, in step S3, the degummed ultra-high molecular weight polyethylene fiber has a degumming rate >90% and a glue content <2wt%.

[0028] Compared with the prior art, the advantages and beneficial effects of the present invention are as follows: 1. The adhesive remover of this invention uses a biodegradable ionic liquid as a solvent and an organic base as a catalyst. The ionic liquid has unique physicochemical properties, which not only cause the adhesive on the surface of polyethylene fibers to swell, but also promote the degradation of the adhesive catalyzed by the organic base. The ionic liquid and the organic base catalyst work together to destroy the functional groups of the adhesive on the fiber surface. As the soaking time increases, the adhesive on the fiber surface degrades into oligomers or small molecules, and the adhesive is washed away from the fiber surface under the action of ultrasonic vibration. At the same time, the system of ionic liquid and organic base has extremely high reactivity and can exhibit excellent performance at relatively low temperatures (50~90°C), which helps to avoid the potential damage to the mechanical properties of high-strength ultra-high molecular weight polyethylene fibers caused by high temperatures.

[0029] 2. The degumming agent of the present invention consists only of biodegradable ionic liquid, organic alkali and deionized water. It is green, environmentally friendly and pollution-free and can be reused. After the degumming of ultra-high molecular weight polyethylene fiber waste is completed, an appropriate amount of water can be added to the degumming agent to precipitate the degummed products dissolved in the degumming agent. Then, the supernatant is evaporated and concentrated under reduced pressure to realize the recycling of the degumming agent.

[0030] 3. The degumming conditions of this invention are mild (<100℃), the operation is simple, the degumming rate is high (>90%), and the glue content of the recovered fiber is less than 2wt%, which is conducive to the high-value recovery of ultra-high molecular weight polyethylene fiber. Attached Figure Description

[0031] Figure 1 The image shows the infrared spectrum of the fibers before degumming in Example 1.

[0032] Figure 2 This is a thermogravimetric analysis diagram of the fibers before degumming in Example 1.

[0033] Figure 3 The image shows the infrared spectrum of the fibers after degumming in Example 1.

[0034] Figure 4 This is a thermogravimetric analysis diagram of the fibers after degumming in Example 1.

[0035] Figure 5 This is a photograph of the fibers before degumming in Example 1.

[0036] Figure 6 This is a photograph of the fibers after degumming in Example 1. Detailed Implementation

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0038] The sources of some components in the examples and comparative examples are as follows: 1-Hexyl-3-methylpyridine chloride, CAS No. 916730-40-0, was purchased from Qingdao Aolike New Material Technology Co., Ltd. 1-Octyl-3-methylpyridine chloride, CAS No. 864461-36-9, was purchased from Qingdao Aolike New Material Technology Co., Ltd. 1-Methyl acetate-3-methylimidazolium chloride, CAS No. 805228-31-3, purchased from Qingdao Aolike New Material Technology Co., Ltd.; 1,8-diazabicyclo[5.4.0]undec-7-ene, CAS No. 6674-22-2, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.; 1,5-Diazabicyclo[4.3.0]non-5-ene, CAS No. 3001-72-7, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.; 1,1,3,3-Tetramethylguanidine, CAS No. 80-70-6, purchased from Shanghai Maclean Biochemical Technology Co., Ltd.

[0039] Example 1 This embodiment provides a method for removing adhesive, including the following steps: Step S1: By weight, add 70 parts of 1-hexyl-3-methylpyridine chloride, 10 parts of 1,8-diazabicyclo[5.4.0]undec-7-ene and 20 parts of deionized water to a 500 mL glass beaker, stir and mix evenly at room temperature to obtain a descaling agent solution.

[0040] Step S2: Place 1 part of ultra-high molecular weight polyethylene fiber waste into the descaling agent solution in the beaker, ensuring that the fiber is completely submerged; Step S3: Cover the mouth of the beaker with plastic wrap and place the beaker in an ultrasonic cleaner with a power of 25 kHz for ultrasonic vibration at a temperature of 90℃. After ultrasonication for 30 minutes, remove the ultra-high molecular weight polyethylene fiber, wash it with tap water at room temperature to remove the adhesive adhering to the fiber surface, and dry it in an oven at 90℃ to obtain the degummed ultra-high molecular weight polyethylene fiber. Then, perform infrared spectroscopy and thermogravimetric analysis to evaluate the degumming effect.

[0041] Example 2 This embodiment provides a method for removing adhesive, including the following steps: Step S1: By weight, add 80 parts of 1-methyl acetate-3-methylimidazolium chloride, 10 parts of 1,5-diazabicyclo[4.3.0]non-5-ene and 10 parts of deionized water to a 500 mL glass beaker, stir and mix evenly at room temperature to obtain a descaling agent solution.

[0042] Step S2: Place 1 part of ultra-high molecular weight polyethylene fiber waste into the descaling agent solution in the beaker, ensuring that the fiber is completely submerged; Step S3: Cover the mouth of the beaker with plastic wrap and place the beaker in an ultrasonic cleaner with a power of 20 kHz for ultrasonic vibration at a temperature of 80℃. After ultrasonication for 180 min, remove the ultra-high molecular weight polyethylene fiber, wash it with tap water at room temperature to remove the adhesive adhering to the fiber surface, and dry it in an oven at 90℃ to obtain the degummed ultra-high molecular weight polyethylene fiber. Then, perform infrared spectroscopy and thermogravimetric analysis to evaluate the degumming effect.

[0043] Example 3 This embodiment provides a method for removing adhesive, including the following steps: Step S1: By weight, add 60 parts of 1-octyl-3-methylpyridine chloride, 5 parts of 1,1,3,3-tetramethylguanidine and 35 parts of deionized water to a 500 mL glass beaker, stir and mix evenly at room temperature to obtain a descaling agent solution.

[0044] Step S2: Place 1 part of ultra-high molecular weight polyethylene fiber waste into the descaling agent solution in the beaker, ensuring that the fiber is completely submerged; Step S3: Cover the mouth of the beaker with plastic wrap and place the beaker in an ultrasonic cleaner with a power of 35 kHz for ultrasonic vibration at a temperature of 70℃. After ultrasonication for 180 minutes, remove the ultra-high molecular weight polyethylene fiber, wash it with tap water at room temperature to remove the adhesive adhering to the fiber surface, and dry it in an oven at 90℃ to obtain the degummed ultra-high molecular weight polyethylene fiber. Then, perform infrared spectroscopy and thermogravimetric analysis to evaluate the degumming effect.

[0045] Example 4 This embodiment provides a method for removing adhesive, including the following steps: Step S1: By weight, add 40 parts of 1-methyl acetate-3-methylimidazolium chloride, 20 parts of 1-hexyl-3-methylpyridinium chloride, 2.5 parts of 1,8-diazabicyclo[5.4.0]undec-7-ene, 2.5 parts of 1,1,3,3-tetramethylguanidine and 35 parts of deionized water to a 500 mL glass beaker, stir and mix evenly at room temperature to obtain a descaling agent solution.

[0046] Step S2: Place 1 part of ultra-high molecular weight polyethylene fiber waste into the descaling agent solution in the beaker, ensuring that the fiber is completely submerged; Step S3: Cover the mouth of the beaker with plastic wrap and place the beaker in an ultrasonic cleaner with a power of 40 kHz for ultrasonic vibration at a temperature of 60℃. After ultrasonication for 240 min, remove the ultra-high molecular weight polyethylene fiber, wash it with tap water at room temperature to remove the adhesive adhering to the fiber surface, and dry it in an oven at 90℃ to obtain the degummed ultra-high molecular weight polyethylene fiber. Then, perform infrared spectroscopy and thermogravimetric analysis to evaluate the degumming effect.

[0047] Example 5 The difference between this embodiment and Example 4 is that the ionic liquid is replaced with 20 parts of 1-methyl acetate-3-methylimidazolium chloride and 40 parts of 1-hexyl-3-methylpyridine chloride.

[0048] Example 6 The difference between this embodiment and Embodiment 4 is that the ionic liquid is replaced with 55 parts of 1-methyl acetate-3-methylimidazolium chloride and 5 parts of 1-hexyl-3-methylpyridine chloride.

[0049] Example 7 The difference between this embodiment and Example 4 is that the organic base is replaced with 4.5 parts of 1,8-diazabicyclo[5.4.0]undec-7-ene and 0.5 parts of 1,1,3,3-tetramethylguanidine.

[0050] Example 8 The difference between this embodiment and Example 4 is that the organic base is replaced with 1 part of 1,8-diazabicyclo[5.4.0]undec-7-ene and 4 parts of 1,1,3,3-tetramethylguanidine.

[0051] Comparative Example 1 The difference between this comparative example and Example 1 is that the adhesive remover was changed to 77.8 parts of 1-hexyl-3-methylpyridine chloride and 22.2 parts of deionized water.

[0052] Comparative Example 2 The difference between this comparative example and Example 1 is that the adhesive remover was changed to 33.3 parts of 1,8-diazabicyclo[5.4.0]undec-7-ene and 66.7 parts of deionized water.

[0053] Comparative Example 3 The difference between this comparative example and Example 1 is that the temperature in the degumming process is changed to 40°C.

[0054] Comparative Example 4 The difference between this comparative example and Example 1 is that the adhesive remover was changed to be prepared using 40 parts of 1-hexyl-3-methylpyridine chloride, 40 parts of 1,8-diazabicyclo[5.4.0]undec-7-ene and 20 parts of deionized water.

[0055] Comparative Example 5 The difference between this comparative example and Example 1 is that the adhesive remover was changed to be prepared using 90 parts of 1-hexyl-3-methylpyridine chloride, 2 parts of 1,8-diazabicyclo[5.4.0]undec-7-ene and 8 parts of deionized water.

[0056] Performance testing The effectiveness of the green adhesive removers used in the examples and comparative examples in removing adhesive residues from the surface of ultra-high molecular weight polyethylene fibers was evaluated using infrared spectroscopy and thermogravimetric analysis.

[0057] (1) Infrared spectroscopy: The infrared spectra of ultra-high molecular weight polyethylene fibers before and after degumming were measured using a Fourier transform infrared spectrometer (MAGNA-IR550, Nicolet, USA) with total reflection accessory. The scanning wavelength range was 4000~600 cm⁻¹. -1 The resolution is 4cm. -1 The number of scans was 16, and three different locations were selected for testing for each sample.

[0058] (2) Thermogravimetric curves: The thermogravimetric curves of ultra-high molecular weight polyethylene fibers before and after degumming were tested using a thermogravimetric analyzer (SDTA851, METTLER, Switzerland). The test temperature range was 30~600℃, the heating rate was 10℃ / min, and the atmosphere was nitrogen.

[0059] The thermogravimetric analysis (TGA) curve of ultra-high molecular weight polyethylene (UHMWPE) fibers before degumming shows approximately 12.4% weight loss in the 200-410℃ temperature range, mainly due to the thermal degradation of the surface adhesive. The TGA of the fibers before degumming in the 200-410℃ temperature range is denoted as W1, and the TGA of the fibers after degumming in the same temperature range is denoted as W2. The degumming rate of the degumming agent is calculated by the change in the TGA rate before and after degumming in the 200-410℃ temperature range: Degumming rate (%) = (W1 - W2) / W1 100.

[0060] Table 1 Performance Test Results As can be seen from the above performance test results, Example 4 has the best overall effect. This is mainly because it preferably uses 1-hexyl-3-methylpyridine chloride and 1-methyl acetate-3-methylimidazolium chloride as the compound ionic liquid, and preferably uses 1,8-diazabicyclo[5.4.0]undec-7-ene and 1,1,3,3-tetramethylguanidine as the compound organic base. By controlling the appropriate mass ratio between the components, the best degumming effect is obtained.

[0061] Compared to Example 1, the adhesive remover in Comparative Example 1 was changed to 77.8 parts of 1-hexyl-3-methylpyridine chloride and 22.2 parts of deionized water. The lack of an organic base resulted in a poorer adhesive removal effect. Compared to Example 1, the adhesive remover in Comparative Example 2 was changed to 33.3 parts of 1,8-diazabicyclo[5.4.0]undec-7-ene and 66.7 parts of deionized water. The lack of an ionic liquid resulted in a poorer adhesive removal effect. Compared to Example 1, the adhesive removal temperature in Comparative Example 3 was changed to 40°C. The low temperature resulted in poor activity of the adhesive remover, thus reducing the adhesive removal effect. The effect deteriorated; compared with Example 1, the adhesive remover in Comparative Example 4 was changed to 40 parts of 1-hexyl-3-methylpyridine chloride, 40 parts of 1,8-diazabicyclo[5.4.0]undec-7-ene and 20 parts of deionized water. The excessive amount of organic base led to poor effect, and the adhesive removal effect deteriorated; compared with Example 1, the adhesive remover in Comparative Example 5 was changed to 90 parts of 1-hexyl-3-methylpyridine chloride, 2 parts of 1,8-diazabicyclo[5.4.0]undec-7-ene and 8 parts of deionized water. The insufficient amount of organic base led to poor effect, and the adhesive removal effect deteriorated.

Claims

1. A green adhesive remover for ultra-high molecular weight polyethylene fiber waste, characterized in that, By weight, it comprises the following components: 60-80 parts of biodegradable ionic liquid, 5-10 parts of organic base and 10-35 parts of deionized water.

2. The green adhesive remover for ultra-high molecular weight polyethylene fiber waste according to claim 1, characterized in that, The biodegradable ionic liquid is selected from one of 1-hexyl-3-methylpyridine chloride, 1-hexyl-3-methylpyridine bromide, 1-octyl-3-methylpyridine chloride, 1-octyl-3-methylpyridine bromide, 1-methyl acetate-3-methylimidazolium chloride, and 1-methyl acetate-3-methylimidazolium bromide.

3. The green adhesive remover for ultra-high molecular weight polyethylene fiber waste according to claim 2, characterized in that, The biodegradable ionic liquid is 1-hexyl-3-methylpyridine chloride and 1-methyl acetate-3-methylimidazolium chloride; The mass ratio of 1-hexyl-3-methylpyridine chloride to 1-methyl acetate-3-methylimidazolium chloride is (2~3):

1.

4. The green adhesive remover for ultra-high molecular weight polyethylene fiber waste according to claim 1, characterized in that, The organic base is selected from one or more of 1,8-diazabicyclo[5.4.0]undec-7-ene, 1,5-diazabicyclo[4.3.0]non-5-ene, and 1,1,3,3-tetramethylguanidine.

5. The green adhesive remover for ultra-high molecular weight polyethylene fiber waste according to claim 4, characterized in that, The organic base is 1,8-diazabicyclo[5.4.0]undec-7-ene and 1,1,3,3-tetramethylguanidine; The mass ratio of the 1,8-diazabicyclo[5.4.0]undec-7-ene to 1,1,3,3-tetramethylguanidine is (1~3):

1.

6. A method for removing adhesive, characterized in that, Includes the following steps: Step S1: Prepare the green degumming agent for ultra-high molecular weight polyethylene fiber waste as described in any one of claims 1 to 5; Step S2: Completely immerse the ultra-high molecular weight polyethylene fiber waste in the adhesive remover described in step S1; Step S3: Transfer to an ultrasonic cleaner for degumming to obtain degummed ultra-high molecular weight polyethylene fibers.

7. The adhesive removal method according to claim 6, characterized in that, In step S2, the mass ratio of the desiccant to the ultra-high molecular weight polyethylene fiber waste is (100~1000):

1.

8. The adhesive removal method according to claim 6, characterized in that, In step S3, the power of the ultrasonic cleaner is 20~40KHz.

9. The adhesive removal method according to claim 6, characterized in that, The temperature for the adhesive removal process in step S3 is 50~90℃; The ultrasonic vibration time for the adhesive removal process in step S3 is 30~240 min.

10. The adhesive removal method according to claim 6, characterized in that, In step S3, the degummed ultra-high molecular weight polyethylene fiber has a degumming rate of >90% and a glue content of <2wt%.

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