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CN-122011654-A - High-toughness recycled plastic dropper material based on waste mulching film and preparation method thereof

CN122011654ACN 122011654 ACN122011654 ACN 122011654ACN-122011654-A

Abstract

The invention discloses a high-toughness regenerated plastic dropper material based on waste mulching films and a preparation method thereof, belongs to the technical field of material regeneration, and is used for solving the technical problem that the tensile resistance and the impact resistance of the regenerated plastic dropper material in the prior art are to be further improved; the invention discloses a plastic dropper product, which is characterized in that a silicon-oxygen ion reinforced component, borate modified regenerated polyethylene and hydroxyurethane flexible polyurethane are cooperatively compounded, an inorganic-organic hybrid constraint structure, a dynamic reversible connection unit and a flexible dissipation channel are built in the material, and the material forms a stable interface coupling and a continuous stress transmission path in the melt processing and service stress process, so that the structure bearing, the morphology stability and the energy distribution capability are taken into consideration, and the plastic dropper product is suitable for plastic dropper products with comprehensive requirements on mechanical properties and heat resistance.

Inventors

  • SHEN HUI
  • DING PENG
  • Gao Sensen
  • JIANG HUI
  • SONG NA
  • JIANG YANYAN
  • GU YUZHEN
  • DONG HUAGANG

Assignees

  • 安徽冠泓塑业有限公司

Dates

Publication Date
20260512
Application Date
20260323

Claims (10)

  1. 1. The preparation method of the high-toughness regenerated plastic dropper material based on the waste mulching film is characterized by comprising the following steps of: s1, performing friction cleaning on waste mulching films to obtain clean mulching films; S2, crushing the clean mulching film, carrying out washing specific gravity separation, and drying and then carrying out cyclone separation to obtain clean mulching film particles; and S3, weighing 84-88 parts by weight of borate modified regenerated polyethylene, 24-27 parts by weight of silicone ion reinforced component, 10-12 parts by weight of hydroxy carbamate flexible polyurethane and 2-3 parts by weight of auxiliary materials, adding into a stirring kettle, uniformly mixing, adding into a double-screw extruder, and carrying out melt extrusion to obtain the regenerated plastic dropper material.
  2. 2. The method for preparing the waste mulch-film-based high-toughness recycled plastic dropper material, which is disclosed in claim 1, is characterized in that in the step S1, the waste mulch film is transferred into a friction washer, the rotation speed of equipment is 400-600rpm, the material filling rate is 30-50%, 1wt% of sodium hydroxide aqueous solution is used as a cleaning medium for cleaning for 15min, 0.5-0.8wt% of citric acid is used as a cleaning medium for cleaning for 15-20min, the water flow speed for washing specific gravity sorting is 0.3-0.5m/S, the wind speed for cyclone sorting is 8-12m/S, and the wind pressure is 1000-1500Pa.
  3. 3. The preparation method of the waste mulch-film-based high-toughness recycled plastic dropper material, as claimed in claim 1, is characterized in that in the step S3, the auxiliary materials are obtained by mixing antioxidant 1010, antioxidant 168, calcium stearate, ethylene bis stearamide and talcum powder according to a mass ratio of 4:4:6:6:20, wherein the temperature of a feeding area in a twin-screw extruder is 160-170 ℃, the temperature of a melting area is 170-180 ℃, the temperature of a die area is 180-190 ℃, and the rotating speed of a screw is 100-120rpm.
  4. 4. The preparation method of the waste mulch-film-based high-toughness recycled plastic dropper material as claimed in claim 1, wherein the borate modified recycled polyethylene is prepared by the following method: A1, adding clean mulch film particles and o-xylene into a reaction kettle, stirring, introducing nitrogen, heating to 105-115 ℃ after protection, preserving heat, stirring for 40min, then adding glycidyl methacrylate, adding benzoyl peroxide after stirring uniformly, maintaining the temperature of the reaction kettle to 105-115 ℃, preserving heat, stirring for 4-6h, cooling the reaction solution to 50-60 ℃ after the reaction is finished, pouring into 95wt% ethanol water solution with 3 times of volume, filtering, collecting filter cakes after precipitation is finished, and drying to obtain epoxy grafted regenerated polyethylene; A2, adding the epoxy grafted regenerated polyethylene, the dopamine hydrochloride, the phenylboronic acid and the absolute ethyl alcohol into a reaction kettle, stirring, heating the reaction kettle to 80-95 ℃ after uniform mixing, carrying out heat preservation reaction for 4-6h, and carrying out reduced pressure distillation until no liquid is extracted after the reaction is finished, thus obtaining the borate modified regenerated polyethylene.
  5. 5. The preparation method of the waste mulching film-based high-toughness recycled plastic dropper material is characterized in that in the step A1, the dosage ratio of clean mulching film particles, o-xylene, glycidyl methacrylate and benzoyl peroxide is 10g to 80mL to 1-2mL to 0.1g, and in the step A2, the dosage ratio of epoxy grafted recycled polyethylene, dopamine hydrochloride, phenylboronic acid and absolute ethyl alcohol is 10g to 0.2-0.3g to 0.3-0.5g to 1-2mL.
  6. 6. The preparation method of the waste mulch film-based high-toughness regenerated plastic dropper material is characterized in that vinyl trimethoxy silane, 3- (methacryloyloxy) propyl trimethoxy silane, dopamine hydrochloride, deionized water and absolute ethyl alcohol are added into a reaction kettle, the temperature is raised to 40-60 ℃ after uniform stirring, the heat preservation reaction is carried out for 6-8h, and after the reaction is finished, the pressure is reduced, distillation is carried out until no liquid is extracted, so that the silicon oxide ion reinforced component is obtained.
  7. 7. The method for preparing the waste mulch-film-based high-toughness recycled plastic dropper material, according to claim 6, wherein in the process of preparing the silicon-oxygen-enhanced component, the dosage ratio of the vinyl trimethoxy silane, the 3- (methacryloyloxy) propyl trimethoxy silane, the dopamine hydrochloride, the deionized water and the absolute ethyl alcohol is 3-5mL:2-3mL:0.8-1.0g:3-5mL:10-15mL.
  8. 8. The method for preparing the waste mulch-based high-toughness recycled plastic dropper material according to claim 1, wherein the hydroxy carbamate flexible polyurethane is prepared by the following method: B1, adding bisphenol A diglycidyl ether into a high-pressure reaction kettle, heating the high-pressure reaction kettle to 110-130 ℃, introducing calculated carbon dioxide, carrying out heat preservation reaction for 8-10 hours, and cooling to room temperature after the reaction is finished to obtain a difunctional cyclic carbonate intermediate; And B2, adding the difunctional cyclic carbonate intermediate and 1, 6-hexamethylenediamine into a reaction kettle, stirring, heating the reaction kettle to 70-90 ℃ after uniform mixing, carrying out heat preservation reaction for 8-12h, and cooling to room temperature after the reaction is finished to obtain the hydroxy carbamate flexible polyurethane.
  9. 9. The preparation method of the waste mulch-film-based high-toughness recycled plastic dropper material is characterized in that in the step B1, the dosage of carbon dioxide is 5-8 times of the molar quantity of epoxy groups in a reaction system, and in the step B2, the dosage ratio of the difunctional cyclic carbonate intermediate to 1, 6-hexamethylenediamine is 10-12g:2-3g.
  10. 10. The waste mulching film-based high-toughness recycled plastic dropper material is characterized in that the waste mulching film-based high-toughness recycled plastic dropper material is prepared by the preparation method of the waste mulching film-based high-toughness recycled plastic dropper material according to any one of claims 1-9.

Description

High-toughness recycled plastic dropper material based on waste mulching film and preparation method thereof Technical Field The invention relates to the technical field of material regeneration, in particular to a high-toughness regenerated plastic dropper material based on waste mulching films and a preparation method thereof. Background The waste mulching film is mainly made of polyethylene materials, and can form regenerated polyolefin raw materials after recovery, sorting, cleaning and regeneration processing, and the regenerated polyolefin raw materials are used for packaging products, extrusion molding parts and other scenes, wherein the plastic dropper is used as a flexible extrusion product commonly used in the industries of medicine, daily chemicals and the like, has comprehensive requirements on toughness, molding consistency and thermal deformation stability of the materials, however, the regenerated plastic mulching film is generally influenced by source difference, impurity residues and repeated thermal processing histories, and has certain fluctuation in molecular structure and performance, so that dropper products face material adaptation requirements in bearing, heat resistance and use reliability, and the development and standardized application of high-toughness regenerated dropper materials based on the waste mulching film are generally focused in the industry. At present, in the preparation process of the regenerated plastic dropper material based on the waste mulch film, a product is generally obtained by adopting a mode of direct extrusion molding or conventional blending modification after simple cleaning and regeneration granulation, and the problems of molecular chain fracture, nonuniform structure, residual impurities and the like are unavoidable in the regeneration process due to the complex sources of the waste mulch film and large difference of use environments, so that the regenerated material has large discreteness in terms of mechanical property and processing stability. In addition, the traditional process is difficult to realize the cooperative balance among toughness, bearing capacity and heat-resistant deformation performance by focusing on the adjustment of single performance on the design of a material system, and the conditions of insufficient shape stability, local stress concentration or performance attenuation and the like easily occur in the extrusion molding and subsequent use processes of the product, so that the method aims at the defects of the waste mulch reclaimed material in the aspects of multi-scale structure cooperation, interface stability and comprehensive performance matching, and still has a space for further optimization and perfection in the industry. Disclosure of Invention The invention aims to provide a high-toughness recycled plastic dropper material based on waste mulching films and a preparation method thereof, which are used for solving the technical problems that the tensile resistance and the impact resistance of the recycled plastic dropper material in the prior art are to be further improved. The invention aims at realizing the technical scheme that the preparation method of the high-toughness regenerated plastic dropper material based on the waste mulching film comprises the following steps: s1, performing friction cleaning on waste mulching films to obtain clean mulching films; S2, crushing the clean mulching film, carrying out washing specific gravity separation, and drying and then carrying out cyclone separation to obtain clean mulching film particles; and S3, weighing 84-88 parts by weight of borate modified regenerated polyethylene, 24-27 parts by weight of silicone ion reinforced component, 10-12 parts by weight of hydroxy carbamate flexible polyurethane and 2-3 parts by weight of auxiliary materials, adding into a stirring kettle, uniformly mixing, adding into a double-screw extruder, and carrying out melt extrusion to obtain the regenerated plastic dropper material. Further, in the step S1, the friction cleaning operation is that the waste mulching film is transferred into a friction washer, the rotation speed of equipment is 400-600rpm, the material filling rate is 30-50%, 1wt% sodium hydroxide aqueous solution is firstly used as a cleaning medium, after the cleaning is carried out for 15min, 0.5-0.8wt% citric acid is used as the cleaning medium, and the cleaning is carried out for 15-20min. Further, in the step S2, the water flow speed of the water washing specific gravity separation is 0.3-0.5m/S, the wind speed of the cyclone separation is 8-12m/S, and the wind pressure is 1000-1500Pa. Further, in the step S3, the auxiliary materials are obtained by mixing an antioxidant 1010, an antioxidant 168, calcium stearate, ethylene bis stearamide and talcum powder according to a mass ratio of 4:4:6:6:20, wherein the temperature of a feeding area in a double-screw extruder is 160-170 ℃, the temperature of a melting area is 170-180 ℃,