CN113980348A - Preparation method of meltable EVA reclaimed material, meltable EVA reclaimed material and application thereof - Google Patents
Preparation method of meltable EVA reclaimed material, meltable EVA reclaimed material and application thereof Download PDFInfo
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Abstract
The invention relates to the field of plastic processing, in particular to a preparation method of a meltable EVA reclaimed material, the meltable EVA reclaimed material and application thereof. The preparation method comprises the following steps: placing waste crosslinked EVA plastic particles with the particle size of 1-30mm in a weak acid or weak alkaline organic solvent, heating to 20-90 ℃ for solubilization treatment for more than 1min to swell but not dissolve the waste EVA plastic particles to obtain solubilized plastic particles; and uniformly mixing the solubilized plastic particles with the antioxidant, placing the mixture at 90-300 ℃ to melt the EVA by using mechanical shearing force, and then performing extrusion granulation to obtain meltable EVA regenerated particles. The preparation method of the meltable EVA reclaimed material provided by the invention has the advantages of high efficiency, low cost, high quality of the prepared EVA reclaimed material, capability of large-scale application and small influence on environment.
Description
Technical Field
The invention relates to the field of plastic processing, in particular to a preparation method of a meltable EVA reclaimed material, the meltable EVA reclaimed material and application thereof.
Background
Plastics play an important role in human society and production life as one of the most widely used materials in the world at present. However, with the popularization of plastic products, the amount of waste plastic is also increased, and serious environmental pollution is caused. The waste plastic recycling technology can solve the problem of environmental pollution to a certain extent, and can ensure the recycling of resources and reduce the consumption of petroleum or bio-based raw materials, so that the waste plastic recycling technology is gradually paid attention and researched by people.
EVA (ethylene-vinyl acetate copolymer) is a general-purpose plastic, which is obtained by copolymerizing ethylene and vinyl acetate, and is widely used in various fields such as shoes, films, wires and cables, adhesives, etc. because it has strong flexibility, chemical resistance, and good elasticity. At present, in many fields, including production of products such as photovoltaic films of solar cells, foamed shoe materials and the like, because the EVA material forms a cross-linked structure in the production process, waste cross-linked EVA such as recycled materials or leftover materials is difficult to melt, and therefore, the EVA material cannot be processed and recycled by conventional material forming and processing methods such as melt extrusion forming and the like. At present, the conventional crosslinked EVA recovery method is used for runway filling after being crushed or used for plastic material filling after being crushed, but the application amount is limited, so that the additional value is not obvious, and the recycling of the waste EVA is limited to a great extent.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the recycling of waste EVA is limited due to the fact that crosslinked EVA cannot be melted in the prior art, so that the invention provides the preparation method of the meltable EVA reclaimed material, the meltable EVA reclaimed material and the application thereof.
The invention aims to solve the technical problems, and provides a preparation method of a meltable EVA reclaimed material, which comprises the following steps:
swelling the particles: placing waste crosslinked EVA plastic particles with particle size of 1-30mm in weak acid or weak alkaline organic solvent, heating to 20-90 deg.C for solubilization treatment for more than 1min to make the waste EVA plastic particles swell but not dissolve to obtain solubilized plastic particles
Melt extrusion: and uniformly mixing the solubilized plastic particles with an antioxidant, placing the mixture at 90-290 ℃ to melt the EVA by using mechanical shearing force, and then extruding and granulating to obtain meltable EVA regenerated particles.
Optionally, the pH of the weakly acidic organic solvent is 1 to 6.5, and/or the pH of the weakly basic organic solvent is 7.5 to 14.
Optionally, the weak acid or weak base organic solvent is an alcoholic solution containing alcohol, phenol or alkane or an aqueous solution containing alcohol, phenol or alkane, which is prepared from an acid compound or an alkali compound and an alcohol organic solvent, a phenol organic solvent, a long-chain alkane organic solvent, a petroleum resin organic solvent or water.
Optionally, the acid compound includes at least one of hydrochloric acid, hydrochloride, nitric acid, nitrate, phosphoric acid, phosphate, formic acid, acetic acid, propionic acid, butyric acid and oxalic acid; and/or the presence of a gas in the gas,
the alkali compound comprises at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium formate, sodium acetate and sodium propionate; and/or the presence of a gas in the gas,
the alcohol organic solvent is an organic solution or an aqueous solution with the content of alcohol compounds being more than 10 percent; and/or the presence of a gas in the gas,
the phenolic organic solvent is an organic solution or an aqueous solution with the phenolic compound content of more than 10 percent; and/or the presence of a gas in the gas,
the long-chain alkane organic solvent is an alcoholic solution or an aqueous solution with the long-chain alkane content of more than 10 percent, which is prepared by dissolving long-chain alkane with the carbon number of more than 5 in water or alcohol; and/or the presence of a gas in the gas,
the petroleum resin organic solvent is an organic solution with the aliphatic hydrocarbon resin content of more than 10 percent, which is prepared by dissolving aliphatic hydrocarbon resin in an alcohol solvent.
Optionally, the alcohol compound includes at least one of glycerol, pentaerythritol, tert-butanol, pentanol, dodecanol, octadecanol, polyether diol and polyester diol; and/or the presence of a gas in the gas,
the phenolic compound comprises at least one of phenol, hydroquinone, p-cresol and naphthol; and/or the presence of a gas in the gas,
the long-chain alkane comprises at least one of silicone oil, liquid paraffin, white oil, polyethylene wax and polypropylene wax; and/or the presence of a gas in the gas,
the aliphatic hydrocarbon resin comprises at least one of C5 petroleum resin, C9 petroleum resin and rosin resin.
Optionally, the weakly acidic or weakly basic organic solvent further comprises an ionic liquid or an ionic compound, and the ionic liquid or the ionic compound comprises at least one of 1-hexyl-3-methylimidazole chloride salt, 1-butyl-3-methylimidazole chloride salt and 1-allyl-3-methylimidazole chloride salt.
Optionally, the waste crosslinked EVA plastic particles with the particle size of 1-30mm are obtained by washing recycled EVA materials with the crosslinking degree of more than 1% with clear water, air-drying and then crushing.
Optionally, the washing step further comprises a step of removing stains by using water containing a cleaning agent with a concentration of 5% -20%.
Optionally, the recycled EVA material is a solar photovoltaic panel recycled EVA adhesive film with a crosslinking degree of more than 1% or a leftover material produced by producing the adhesive film.
Optionally, the recycled EVA material has an EVA content of more than 10%.
Optionally, the antioxidant is at least one of aromatic amine antioxidant, hindered phenol antioxidant and auxiliary antioxidant, preferably at least one of 2, 6-tertiary butyl-4-methylphenol, bis (3, 5-tertiary butyl-4-hydroxyphenyl) thioether and pentaerythritol tetrakis [ beta- (3, 5-tertiary butyl-4-hydroxyphenyl) propionate ].
Optionally, the melt extrusion process further comprises a step of mixing a deodorizing agent with the swollen particles, wherein the deodorizing agent is preferably an inorganic compound such as sodium bicarbonate, sodium carbonate, potassium bicarbonate, potassium carbonate, and the like, or an organic compound such as essence, a commercial professional deodorizing agent, and the like. The odor removing agent is used for removing vinyl acetate decomposition products generated in the extrusion process.
Optionally, the mechanical shearing force is derived from one or more of a twin-screw extruder, a single-screw extruder, a honey mill, an open mill and a kneader.
Optionally, the mechanical shearing force is from a double-screw extruder, the length-diameter ratio of the double-screw extruder is more than 38, the screw rotation speed is more than 10 revolutions per minute, and the extrusion processing temperature is 90-290 ℃.
The invention also provides a meltable EVA reclaimed material which is prepared by the preparation method in any scheme.
The invention also provides an application of the meltable EVA reclaimed material, which is applied to foaming materials, injection molding materials, toy soft rubber materials, hot melt adhesives, engineering plastics toughening modification, preparation of cross-linked heat-shrinkable sleeves and preparation of shape memory polymer materials.
The technical scheme of the invention has the following advantages:
1. the method for preparing the meltable EVA reclaimed material comprises the steps of solubilizing the waste crosslinked EVA plastic particles to ensure that EVA is swelled but not dissolved so as to reduce the strength of a crosslinked network of the EVA, then applying mechanical force to shear the EVA, and breaking chemical bonds such as ester bonds, ether bonds and the like in the crosslinked network of the crosslinked EVA and removing the crosslinked structure of a crosslinked EVA molecular chain under the synergistic action of chemical solubilization and high-temperature mechanical shearing so that the obtained EVA reclaimed material can be melted to be conveniently reprocessed and utilized.
2. According to the preparation method of the meltable EVA reclaimed material, provided by the invention, the particle size of the waste EVA plastic particles is limited to 1-30mm, so that the swelling process can be accelerated, and the smooth feeding is facilitated during the subsequent melt extrusion. The type and the processing time of the organic solvent are limited, so that the waste EVA plastic particles can be only swelled but not dissolved in the solubilization process, and meanwhile, the organic solvent can catalyze the degradation of chemical bonds such as ester bonds, ether bonds and the like in the EVA cross-linked network after permeating into the EVA cross-linked network, so that the meltable processing and recovery of the cross-linked EVA can be completed under the action of subsequent high-temperature mechanical shear force. During melt extrusion, antioxidant is added to reduce the oxidation influence in the thermal processing process, and the free radical component under the action of mechanical shearing is neutralized to avoid the formation of a cross-linked network again.
3. The meltable EVA reclaimed material provided by the invention has the advantages of better transparency, high purity, good fluidity and good mechanical property advantage, and can be used as a raw material for melt processing application.
4. The application of the meltable EVA reclaimed material provided by the invention realizes the cyclic utilization of cross-linked EVA resources and reduces the environmental pollution.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a product appearance diagram of the EVA regrind of example 1 of the present invention;
FIG. 2 is a diagram showing the foaming effect of the EVA recycled material of example 1 of the present invention;
FIG. 3 is an infrared spectrum of an EVA regrind of example 2 of the present invention;
FIG. 4 is an infrared spectrum of EVA as a raw material in example 2 of the present invention;
FIG. 5 is a DSC plot of the EVA regrind of example 3 of the present invention;
FIG. 6 is a DSC plot of the starting EVA material of example 3 of the present invention;
FIG. 7 is a graph of the Tg of the EVA regrind of example 4 of the present invention;
FIG. 8 is a graph of Tg for the starting EVA material of example 4 of the present invention;
FIG. 9 is a graph showing the mechanical properties of the EVA regrind of example 5 of the present invention;
FIG. 10 is a graph showing the mechanical properties of EVA as a raw material in example 5 of the present invention.
Detailed Description
The following examples are provided to further understand the present invention, not to limit the scope of the present invention, but to provide the best mode, not to limit the content and the protection scope of the present invention, and any product similar or similar to the present invention, which is obtained by combining the present invention with other prior art features, falls within the protection scope of the present invention.
The examples do not show the specific experimental steps or conditions, and can be performed according to the conventional experimental steps described in the literature in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional reagent products which can be obtained commercially.
Example 1
The embodiment relates to a meltable EVA reclaimed material, which is prepared by the following steps:
s1, cleaning raw materials: selecting leftover materials of an EVA (ethylene-vinyl acetate) adhesive film as a raw material, wherein the crosslinking degree is about 80%, the EVA content is 90%, and washing the raw material with washing powder water under high pressure to obtain a purified raw material;
s2, crushing: crushing the purified raw materials (leftover materials) by a glue film shredder to obtain crushed sizing materials. The crushed size is a rectangular size with a length of about 2.0-4.0mm and a width of about 0.5 mm.
S3, swelling of particles: soaking the crushed rubber material in an organic solvent, and performing heat regeneration at 40 ℃ for 60min, wherein the adopted organic solvent is an aqueous solution containing 1% of sodium hydroxide and 50% of monoethylene glycol, and finally obtaining a solubilized EVA rubber material with the solubilization rate of more than 30%;
s4, melt extrusion: uniformly mixing the solubilized rubber material with 1% of sodium bicarbonate, 1% of antioxidant 1010 and 1% of auxiliary antioxidant 168, and then continuously discharging by adopting a 35-twin-screw extruder at a discharging speed of 10 revolutions per minute; the rotating speed of the main engine is about 50 revolutions per minute, and the temperature rise of each zone is as follows: the temperature of the first zone is 150 ℃, the temperature of the second zone is 160 ℃, the temperature of the third zone-the sixth zone is 165 ℃, and the temperature of the seventh zone and the eighth zone is 170 ℃. Finally, an underwater pelletizer is used for grain extraction to obtain a grain reclaimed material, as shown in figure 1.
The prepared EVA reclaimed material has a melt index of 3.684g/10min (250 ℃ under 5kg load) and an EVA sheet hardness of about (Share A) 53. The EVA recycled material is applied to foaming shoelace products, and has a good foaming effect as shown in figure 2.
Example 2
The embodiment relates to a meltable EVA reclaimed material, which is prepared by the following steps:
s1, cleaning raw materials: selecting leftover materials of an EVA (ethylene-vinyl acetate) adhesive film as a raw material, wherein the crosslinking degree is about 60%, the EVA content is 80%, and washing the raw material with water containing detergent at high pressure to obtain a purified raw material;
s2, crushing: crushing the purified raw materials (leftover materials) by a glue film shredder to obtain crushed sizing materials. The crushed rubber material is a rectangular material with the length of about 2.0-3.0mm and the width of about 0.5 mm;
s3, swelling of particles: soaking the crushed rubber material in an organic solvent, and heating at 40 ℃ for 50min, wherein the organic solvent is an alcohol solution containing 1% of sodium hydroxide and 40% of hydroquinone, and finally obtaining a solubilized EVA rubber material with the solubilization of more than 40%;
s4, melt extrusion: uniformly mixing the solubilized gum material with 0.5% of essence, 1% of antioxidant 1010 and 1% of auxiliary antioxidant 168, and then continuously discharging by adopting a 50-twin-screw extruder at the discharging speed of 30 revolutions per minute; the rotating speed of the main engine is about 100 revolutions per minute, and the temperature rise of each zone is as follows: the temperature of the first zone is 160 ℃, the temperature of the second zone is 170 ℃, the temperature of the third zone-the sixth zone is 180 ℃, the temperature of the seventh zone and the eighth zone is 175 ℃, and finally, an underwater granulator is adopted for grain extraction to obtain the particle reclaimed material.
The prepared EVA reclaimed material has a melt index of 8.16g/10min (250 ℃ under a load of 5 kg), and the hardness of an EVA sheet is about (ShaoA) 55. The infrared spectrogram of the EVA reclaimed material is shown in figure 3, and the infrared spectrogram of the raw material EVA is shown in figure 4, which shows that the reclaimed EVA rubber material has the same chemical structure as the raw material EVA.
Example 3
The embodiment relates to a meltable EVA reclaimed material, which is prepared by the following steps:
s1, cleaning raw materials: selecting leftover materials of an EVA (ethylene-vinyl acetate) adhesive film as a raw material, wherein the crosslinking degree is about 50%, the EVA content is 80%, and washing the raw material with water containing detergent at high pressure to obtain a purified raw material;
s2, crushing: crushing the purified raw materials (leftover materials) by a glue film shredder to obtain crushed sizing materials. The crushed rubber material is a rectangular material with the length of about 2.0-3.0mm and the width of about 0.5 mm;
s3, swelling of particles: placing the crushed rubber material in an organic solvent for soaking, and performing heat regeneration at 60 ℃ for 30min, wherein the adopted organic solvent is an alcohol solution containing 3% of sodium hydroxide and 80% of liquid paraffin, and finally obtaining a solubilized EVA rubber material with the solubilization rate of more than 30%;
s4, melt extrusion: uniformly mixing the solubilized gum material with 0.5% of essence, 1% of antioxidant 1010 and 1% of auxiliary antioxidant 168, and then continuously discharging by adopting a 65-twin-screw extruder at a discharging speed of 50 revolutions per minute; the rotating speed of the main engine is about 200 revolutions per minute, and the temperature rise of each zone is as follows: the temperature of the first zone is 160 ℃, the temperature of the second zone is 170 ℃, the temperature of the third zone-the sixth zone is 180 ℃, and the temperature of the seventh zone and the eighth zone is 175 ℃. And finally, extracting particles by using an underwater granulator to obtain a particle reclaimed material.
The prepared EVA reclaimed material has a melt index of 1.44g/10min (250 ℃ under a load of 5 kg), and the hardness of an EVA sheet is about (Share A) 55. The DSC curve of the EVA reclaimed material is shown in figure 5, and the DSC curve of the common EVA material is shown in figure 6, which shows that the reclaimed EVA rubber material has a crystallization melting peak at 64 ℃ and a crystallization peak on a cooling curve like the common EVA material. The thermal property of the conventional EVA is maintained, and the EVA has low-temperature crystallinity and better flexibility and has important application advantages in shoe materials.
Example 4
The embodiment relates to a meltable EVA reclaimed material, which is prepared by the following steps:
s1, cleaning raw materials: selecting an EVA adhesive film of a solar cell module as a raw material, wherein the crosslinking degree is about 90%, the EVA content is 70%, and washing the raw material with water at high pressure to obtain a purified raw material;
s2, crushing: crushing the purified raw materials (leftover materials) by a glue film shredder to obtain crushed sizing materials. Crushing the rubber material into particles with the particle size of 1.0-3.0 mm;
s3, swelling of particles: soaking the crushed rubber material in an organic solvent, and performing heat regeneration at 50 ℃ for 40min, wherein the adopted organic solvent is an alcohol solution containing 1% hydrochloric acid and 30% polyethylene, and finally obtaining a solubilized EVA rubber material with the solubilization of more than 50%;
s4, melt extrusion: uniformly mixing the solubilized gum material with 0.5% of essence, 0.5% of antioxidant 1010 and 0.5% of auxiliary antioxidant 168, and then continuously feeding by adopting a 65-twin-screw extruder at a feeding speed of 50 revolutions per minute; the rotating speed of the main engine is about 200 revolutions per minute, and the temperature rise of each zone is as follows: the temperature of the first zone is 160 ℃, the temperature of the second zone is 170 ℃, the temperature of the third zone-the sixth zone is 180 ℃, and the temperature of the seventh zone and the eighth zone is 175 ℃. And finally, extracting particles by using an underwater granulator to obtain a particle reclaimed material.
The prepared EVA reclaimed material has a melt index of 0.92g/10min (250 ℃ under 5kg load) and the EVA sheet hardness of about (Share A) 54. The TG curve of the EVA reclaimed material is shown in figure 7, and the TG curve of the original EVA material is shown in figure 8, which shows that the reclaimed EVA rubber compound has lower VA content which is about 10 percent, and compared with the original EVA material, the VA content is reduced, and the main reason is that VA is decomposed under the action of high-temperature mechanical shearing. Meanwhile, the thermal decomposition temperature of the EVA reclaimed material is seen to exceed 330 ℃. The regenerated EVA has relatively high heat-generating stability, and can be applied to toughening modification of materials such as PA, PET, PBT and the like.
Example 5
The embodiment relates to a meltable EVA reclaimed material, which is prepared by the following steps:
s1, cleaning raw materials: selecting an EVA adhesive film of a solar cell module as a raw material, wherein the crosslinking degree is about 75%, the EVA content is 80%, and washing the raw material with water at high pressure to obtain a purified raw material;
s2, crushing: crushing the purified raw materials (leftover materials) by a glue film shredder to obtain crushed sizing materials. Crushing the rubber material into particles with the particle size of 1.0-2.5 mm;
s3, swelling of particles: soaking the crushed rubber material in an organic solvent, and performing heat regeneration at 80 ℃ for 30min, wherein the adopted organic solvent is an aqueous solution containing 3% of phosphoric acid and 40% of dodecanol, and finally obtaining a solubilized EVA rubber material with the solubilization rate of more than 30%;
s4, melt extrusion: uniformly mixing the solubilized gum material with 0.5% of essence, 0.5% of antioxidant 1010 and 0.5% of auxiliary antioxidant 168, and then continuously feeding by adopting a 65-twin-screw extruder at a feeding speed of 100 revolutions per minute; the rotating speed of the main engine is about 300 revolutions per minute, and the temperature rise of each zone is as follows: the temperature of the first zone is 160 ℃, the temperature of the second zone is 170 ℃, the temperature of the third zone-the sixth zone is 180 ℃, and the temperature of the seventh zone and the eighth zone is 175 ℃. And finally, extracting particles by using an underwater granulator to obtain a particle reclaimed material.
The prepared EVA reclaimed material has a melt index of 1.54g/10min (250 degrees, 5kg load) and an EVA sheet hardness of about (Share A) 56. The mechanical property curve of the EVA reclaimed material is shown in figure 9, the mechanical property curve of the original EVA material is shown in figure 10, and the regenerated EVA rubber material has good mechanical property, the tensile strength exceeds 3.0MPA, and the elongation at break is close to 300%.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A preparation method of a meltable EVA reclaimed material is characterized by comprising the following steps:
swelling the particles: placing waste crosslinked EVA plastic particles with the particle size of 1-30mm in a weak acid or weak alkaline organic solvent, heating to 20-90 ℃ for solubilization treatment for more than 1min to swell but not dissolve the waste EVA plastic particles to obtain solubilized plastic particles;
melt extrusion: and uniformly mixing the solubilized plastic particles with an antioxidant, placing the mixture at 90-290 ℃ to melt the EVA by using mechanical shearing force, and then extruding and granulating to obtain meltable EVA regenerated particles.
2. The production method according to claim 1, wherein the pH of the weakly acidic organic solvent is 1 to 6.5, and/or the pH of the weakly basic organic solvent is 7.5 to 14.
3. The method according to claim 2 or 3, wherein the organic solvent having weak acidity or weak alkalinity is an alcoholic solution containing alcohol, phenol or alkane or an aqueous solution containing alcohol, phenol or alkane, which is prepared from an acid compound or a base compound and an alcoholic organic solvent, a phenolic organic solvent, a long-chain alkane organic solvent, a petroleum resin organic solvent or water.
4. The production method according to claim 3, wherein the acid compound includes at least one of hydrochloric acid, hydrochloride, nitric acid, nitrate, phosphoric acid, phosphate, formic acid, acetic acid, propionic acid, butyric acid, and oxalic acid; and/or the presence of a gas in the gas,
the alkali compound comprises at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, sodium formate, sodium acetate and sodium propionate; and/or the presence of a gas in the gas,
the alcohol organic solvent is an organic solution or an aqueous solution with the content of alcohol compounds being more than 10 percent; and/or the presence of a gas in the gas,
the phenolic organic solvent is an organic solution or an aqueous solution with the phenolic compound content of more than 10 percent; and/or the presence of a gas in the gas,
the long-chain alkane organic solvent is an alcoholic solution or an aqueous solution with the long-chain alkane content of more than 10 percent, which is prepared by dissolving long-chain alkane with the carbon number of more than 5 in water or alcohol; and/or the presence of a gas in the gas,
the petroleum resin organic solvent is an organic solution with the aliphatic hydrocarbon resin content of more than 10 percent, which is prepared by dissolving aliphatic hydrocarbon resin in an alcohol solvent.
5. The method according to claim 4, wherein the alcohol compound comprises at least one of glycerol, pentaerythritol, t-butanol, pentanol, dodecanol, octadecanol, polyether diol, and polyester diol; and/or the presence of a gas in the gas,
the phenolic compound comprises at least one of phenol, hydroquinone, p-cresol and naphthol; and/or the presence of a gas in the gas,
the long-chain alkane comprises at least one of silicone oil, liquid paraffin, white oil, polyethylene wax and polypropylene wax; and/or the presence of a gas in the gas,
the aliphatic hydrocarbon resin comprises at least one of C5 petroleum resin, C9 petroleum resin and rosin resin.
6. The method according to any one of claims 3 to 4, wherein the organic solvent having weak or weak acidity further comprises an ionic liquid or an ionic compound, and the ionic liquid or the ionic compound comprises at least one of 1-hexyl-3-methylimidazole chloride salt, 1-butyl-3-methylimidazole chloride salt, and 1-allyl-3-methylimidazole chloride salt.
7. The preparation method according to claim 1, wherein the waste crosslinked EVA plastic particles with the particle size of 1-30mm are obtained by washing recycled EVA materials with the crosslinking degree of more than 1% with clear water, air-drying and crushing.
8. The method of claim 1, wherein the mechanical shearing force is derived from one or more of a twin-screw extruder, a single-screw extruder, a compounder, an open mill, and a kneader.
9. A meltable EVA regrind produced according to the method of any one of claims 1 to 8.
10. The use of a meltable EVA regrind according to claim 9 in the production of foams, injection-molded materials, toy soft-glue materials, hot-melt adhesives, engineering plastics toughening modifications, cross-linking heat-shrinkable sleeves, and shape memory polymer materials.
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