CN112175325A - Processing technology for repairing mechanical property of waste plastic production garbage can - Google Patents

Processing technology for repairing mechanical property of waste plastic production garbage can Download PDF

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CN112175325A
CN112175325A CN202011087661.4A CN202011087661A CN112175325A CN 112175325 A CN112175325 A CN 112175325A CN 202011087661 A CN202011087661 A CN 202011087661A CN 112175325 A CN112175325 A CN 112175325A
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waste
plastic
mechanical property
mass
temperature
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郭坤
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Maanshan Zhuofan New Material Technology Co ltd
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Maanshan Zhuofan New Material Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08L27/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/20—Compounding polymers with additives, e.g. colouring
    • C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
    • C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2300/00—Characterised by the use of unspecified polymers
    • C08J2300/30—Polymeric waste or recycled polymer
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
    • C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
    • C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
    • C08J2327/06—Homopolymers or copolymers of vinyl chloride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2479/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2461/00 - C08J2477/00
    • C08J2479/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
    • C08J2479/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives

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  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
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  • Processes Of Treating Macromolecular Substances (AREA)

Abstract

The invention discloses a processing technology for repairing the mechanical property of a waste plastic production garbage can, which relates to the technical field of waste plastic reprocessing, and specifically comprises the following steps: 1) modifying the bismaleimide resin by cashew nut shell oil; 2) preparing porous carbon nanosheets; 3) processing the recovered waste and old plastic to obtain waste PVC master batch; 4) the garbage can is prepared by the steps of mixing and banburying the raw materials, then carrying out injection molding, and then processing and assembling. According to the invention, the modified long-chain bismaleimide resin and the porous carbon nanosheet are introduced into the plastic system, and the introduced additives are utilized to repair the waste PVC plastic, so that the mechanical property of the waste plastic is repaired to the greatest extent, the processed product of the waste plastic can reach the mechanical property similar to that of a primary plastic product, and the efficient utilization of the waste plastic is facilitated.

Description

Processing technology for repairing mechanical property of waste plastic production garbage can
Technical Field
The invention belongs to the technical field of waste plastic reprocessing, and particularly relates to a processing technology for repairing mechanical properties of a waste plastic production garbage can.
Background
Plastics are widely used in various fields of national economy due to their excellent properties. The plastic product brings convenience to human life and brings great negative effect. The recycling, regenerating and granulating provides a resource road for the treatment of the waste plastics, reduces the pollution of the waste plastics to the environment, and realizes the recycling of energy. The waste plastic regeneration granulation is different from in-situ blending and composite modification. The standard of the method is in-situ restoration, in fact, the method takes recycled plastics as a processing main body to realize the process of primary plastics.
The regeneration granulation is a recovery method for changing waste plastics into granules by a granulation process. The regenerated particles can be used for molding processing, and the performance of the prepared product is similar to that of the original product, so that the regenerated particles have high economic value. Compared with landfill treatment and incineration treatment, regeneration granulation is really resource regeneration and recycling. In China, the waste plastic recycling and granulating technology starts earlier, and makes a great contribution to the recycling of resources. However, most of the enterprises in China are in a small-scale and disordered production and operation mode, sewage and waste materials are easily produced in the processing process and are directly discharged without treatment, so that environmental pollution is caused, and the waste plastic recycling and granulating efficiency in China is low, the cost is high and the working environment is poor. The quality of the regenerated plastic particles and the performance of the regenerated plastic products depend on the granulation process, and the research of finding a simple, convenient, fast, efficient, energy-saving, environment-friendly, economical and applicable process flow is the key point of the research in the field of plastic granulation. The recycled plastic can be prepared into regenerated granules similar to the acoustic plastic as long as the formula is reasonable and the process is proper. The granulation not only accords with the ecological law, but also has higher selling price and huge market potential, and can compete with the primary plastic.
The raw material of the regeneration granulation is mainly recycled waste plastics, the waste and/or waste plastics are waste materials of plastic processing enterprises or after plastic preparation and use, and can be re-granulated and recycled, but the problems of poor mechanical property of the plastics and the like are caused by partial degradation in the using process and high-temperature treatment in multiple processing processes. Therefore, in the process of processing and recycling the recycled plastic, the waste plastic needs to be processed, so that the performance of the waste plastic is restored, and the waste plastic can be better utilized.
Disclosure of Invention
The invention aims to provide a processing technology for repairing the mechanical property of a waste plastic production garbage can, aiming at the existing problems.
The invention is realized by the following technical scheme:
a processing technology for repairing the mechanical property of a waste plastic production garbage can comprises the following specific processes:
1) adding a proper amount of cashew nut shell oil into a container, heating in an oil bath, slowly adding the bismaleimide resin under the stirring condition when the temperature reaches 115-120 ℃, controlling the mass ratio of the cashew nut shell oil to the bismaleimide to be 1:1.5-1.8, continuously heating to 120-125 ℃ after the materials are gradually changed from dark purple to dark brown, reacting for 2-3h, transferring the product into an oven after the reaction is finished, and carrying out heat preservation treatment for 4-5h at 113 ℃ of 108-113 ℃ to obtain the modified long-chain bismaleimide resin; aiming at the defects that the recycled plastic contains inert impurities which destroy the chain polarity in a plastic system and the recycled plastic is hard and brittle, in the invention, the long-chain type dimaleimide resin is obtained by introducing long-chain type molecular cashew shell oil to carry out chain extension modification treatment on the dimaleimide resin, the obtained modified dimaleimide resin is introduced into a plastic matrix, and the long-chain polymer resin enters the plastic system, so that the surface of the inert impurities can be wetted and coated, the hardness of the hardened impurities is lost, the defect of high brittleness of the recycled plastic can be improved, and the impact resistance of a plastic product is improved;
2) dissolving weighed urea in deionized water according to the mass-to-volume ratio of 1:20-30g/mL, adding peach gum with the same mass as the urea, standing for 1-2d, pre-freezing with liquid nitrogen for 1-2h after the peach gum is completely swelled, freeze-drying at-45- -55 ℃ for 45-50h, then placing in a tube furnace, carbonizing at 580 ℃ for 1-2h under the protection of nitrogen, cooling to room temperature to obtain a pre-carbonized product, adding the pre-carbonized product and potassium hydroxide into a container according to the mass ratio of 1:2-2.5, stirring for 2-3h at 160r/min under 100-, washing the porous carbon nano-sheet with deionized water to be neutral, and drying to obtain a porous carbon nano-sheet; according to the method, peach gum is used as a natural carbon source, the porous carbon with a nanosheet structure is prepared by activating potassium hydroxide by utilizing the self-template effect of polysaccharide contained in the peach gum and assisting with the characteristics of urea doped with a certain amount of nitrogen content and swelling, the formed porous carbon nanosheet is introduced into a plastic matrix, and an interpenetrating structure formed by the porous carbon nanosheet and the plastic matrix can play a role in transferring and dispersing load, so that the plastic matrix is converted from transient brittle failure into progressive ductile failure, the fracture process of the plastic matrix can be remarkably prolonged, the plastic matrix has stronger capability of resisting fragmentation, the toughness of waste recycled plastics can be repaired, the impact resistance of the waste recycled plastics can be further improved, and the processed and manufactured garbage can not be easily damaged in collision;
3) recovering waste and waste plastics, carrying out sorting, cleaning and drying treatment, carrying out primary crushing and fine crushing, then carrying out double-screw extruder, setting the extrusion temperature of the double-screw extruder to be 175-;
4) heating the waste PVC master batch to the temperature of 135-140 ℃ for 10-15min, adding a proper amount of filler and porous carbon nanosheets, slowly heating to the temperature of 180-185 ℃, adding a proper amount of carbon fibers and glass fibers, continuously stirring for 10-15min, slowly cooling to room temperature, mixing with the modified long-chain bismaleimide resin and the auxiliary agent, adding into a mixer, blending for 20-30min at the temperature of 90-100 ℃ and at the temperature of 600-800r/min, banburying for 40-50min at the temperature of 200 ℃ through an open mill 190-190 ℃, adding into an injection molding machine for injection molding, and processing and assembling to obtain the required garbage can.
Further, the filler is at least one of active calcium carbonate and nano montmorillonite; the addition amount of the filler is 0.5-1.0% of the mass of the waste PVC master batch; the adding amount of the porous carbon nanosheets is 2-4% of the mass of the waste PVC master batch; the using amounts of the carbon fiber and the glass fiber respectively account for 0.3-0.6% and 0.5-0.8% of the mass of the waste PVC master batch; the dosage of the modified long-chain bismaleimide resin and the adjuvant respectively accounts for 3-6% and 2-4% of the mass of the waste PVC master batch.
Further, the adjuvant comprises the following components in parts by weight: 2-3 parts of antioxidant, 2-3 parts of plasticizer, 1-2 parts of flame retardant, 2-4 parts of heat stabilizer, 1-3 parts of lubricant and 3-5 parts of coupling agent.
Further, the antioxidant is an antioxidant 1010; the plasticizer is prepared by mixing di (2-ethylhexyl) phthalate, adipate and hydroxyethyl cellulose according to the mass ratio of 2:1: 3-3.5; the flame retardant is prepared by mixing ammonium polyphosphate, hexabromocyclododecane and zinc borate according to the mass ratio of 1:2-3: 2; the heat stabilizer is one or more of a calcium-zinc composite stabilizer, a composite rare earth stabilizer and hydrotalcite; the lubricant is one or more of paraffin wax, PE wax and OPE wax; the coupling agent is one or more of aluminate coupling agent, titanate coupling agent and silane coupling agent.
Compared with the prior art, the invention has the following advantages:
aiming at the technical defects that the impact resistance of the waste PVC plastic is greatly reduced and the reprocessed product cannot meet the normal use requirement due to the reduction of the hydrogen bond force and the number of PVC polymers caused by the influence of thermal oxidation of the waste PVC plastic, the invention introduces modified long-chain bismaleimide resin and porous carbon nanosheets into a plastic system, repairs the waste PVC plastic by using introduced additives, and the added modified long-chain bismaleimide resin can wet and coat the surfaces of inert impurities in the plastic system, so that the hardness of hardened impurities is lost, and the function of softening the impurities is achieved, so that the defect of high brittleness of the recycled plastic can be improved, and the impact resistance of the plastic product is improved; the added porous carbon nanosheet can form an interpenetrating structure with a plastic matrix, so that the functions of transferring and dispersing load can be achieved, the plastic matrix is changed from transient brittle failure to progressive ductile failure, the fracture process of the plastic matrix can be obviously prolonged, the plastic matrix has stronger capability of resisting fragmentation, the toughness of the waste plastic can be repaired, the impact resistance of the waste plastic is further improved, the mechanical property of the waste plastic is repaired to the maximum extent, processed products of the waste plastic can achieve the mechanical property similar to that of original plastic products, and the efficient utilization of the waste plastic is facilitated.
Detailed Description
The present invention will be further described with reference to specific embodiments.
Example 1
A processing technology for repairing the mechanical property of a waste plastic production garbage can comprises the following specific processes:
1) adding a proper amount of cashew nut shell oil into a container, heating in an oil bath, slowly adding the bismaleimide resin under the stirring condition when the temperature reaches 115 ℃, controlling the mass ratio of the cashew nut shell oil to the bismaleimide to be 1:1.5, continuously heating to 120 ℃ when the material is gradually changed into dark brown liquid from dark purple red, reacting for 2 hours, after the reaction is finished, moving the product into an oven, and carrying out heat preservation treatment at 108 ℃ for 4 hours to obtain the modified long-chain bismaleimide resin;
2) dissolving weighed urea in deionized water according to the mass-to-volume ratio of 1:20g/mL, adding peach gum with the same mass as the urea, standing for 1d, pre-freezing the peach gum by using liquid nitrogen after the peach gum is completely swelled for 1h, freeze-drying the peach gum at-45 ℃ for 45h, then placing the peach gum in a tube furnace, carbonizing the peach gum at 550 ℃ for 1h under the protection of nitrogen, cooling the peach gum to room temperature to obtain a pre-carbonized product, adding the pre-carbonized product and potassium hydroxide into a container according to the mass ratio of 1:2, stirring the mixture for 2h at 100r/min, placing the mixture in a 70 ℃ oven for overnight drying, transferring the dried product into a crucible, activating the product for 1h at 700 ℃ under the protection of nitrogen, repeatedly washing the product after cooling, washing the product with hydrochloric acid to neutral with deionized water, and drying the porous carbon nanosheet;
3) recovering waste and waste plastics, sorting, cleaning and drying, carrying out primary crushing and fine crushing, then carrying out double-screw extruder, setting the extrusion temperature of the double-screw extruder to be 175 ℃, putting the extruded waste PVC master batch into a stearic acid solution with the mass concentration of 6.5% at room temperature, soaking for 20min, filtering, washing and drying to obtain the waste PVC master batch;
4) heating the waste PVC master batch to 135 ℃, keeping the temperature for 10min, adding a proper amount of activated calcium carbonate and porous carbon nanosheets according to 0.5% and 2% of the mass of the waste PVC master batch, then slowly heating to 180 ℃, adding a proper amount of carbon fibers and glass fibers according to 0.3% and 0.5% of the mass of the waste PVC master batch, continuously stirring for 10min, slowly cooling to room temperature, mixing with a modified long-chain bismaleimide resin accounting for 3% of the mass of the waste PVC master batch and an auxiliary agent accounting for 2% of the mass of the waste PVC master batch, adding into a mixer, blending for 20min at 90 ℃ and 600r/min, banburying for 40min at 190 ℃ by an open mill, adding into an injection molding machine for injection molding, and processing and assembling to obtain the required garbage can.
Further, the adjuvant comprises the following components in parts by weight: 2 parts of antioxidant, 2 parts of plasticizer, 1 part of flame retardant, 2 parts of heat stabilizer, 1 part of lubricant and 3 parts of coupling agent.
Further, the antioxidant is an antioxidant 1010; the plasticizer is prepared by mixing di (2-ethylhexyl) phthalate, adipate and hydroxyethyl cellulose according to the mass ratio of 2:1: 3; the flame retardant is prepared by mixing ammonium polyphosphate, hexabromocyclododecane and zinc borate according to the mass ratio of 1:2: 2; the heat stabilizer is a calcium-zinc composite stabilizer; the lubricant is paraffin; the coupling agent is an aluminate coupling agent.
Example 2
A processing technology for repairing the mechanical property of a waste plastic production garbage can comprises the following specific processes:
1) adding a proper amount of cashew nut shell oil into a container, heating in an oil bath, slowly adding the bismaleimide resin under stirring when the temperature reaches 118 ℃, controlling the mass ratio of the cashew nut shell oil to the bismaleimide to be 1:1.6, continuously heating to 123 ℃ when the material is gradually changed from deep purple red to deep brown liquid, reacting for 2.5 hours, after the reaction is finished, moving the product into an oven, and carrying out heat preservation treatment at 110 ℃ for 4.5 hours to obtain the modified long-chain bismaleimide resin;
2) dissolving weighed urea in deionized water according to the mass-to-volume ratio of 1:25g/mL, adding peach gum with the same mass as the urea, standing for 1d, pre-freezing the peach gum by using liquid nitrogen after the peach gum is completely swelled for 1.5h, freeze-drying the peach gum at-50 ℃ for 47h, then placing the peach gum in a tube furnace, carbonizing the peach gum at 570 ℃ for 1.5h under the protection of nitrogen, cooling the peach gum to room temperature to obtain a pre-carbonized product, adding the pre-carbonized product and potassium hydroxide into a container according to the mass ratio of 1:2.3, stirring the pre-carbonized product and potassium hydroxide at 140r/min for 2.5h, placing the container in a 75 ℃ oven for overnight drying, transferring the dried product into a crucible, activating the pre-carbonized product at 710 ℃ for 1.5h under the protection of nitrogen, repeatedly washing the cooled product by using hydrochloric acid, washing the product to be neutral by using deionized water;
3) recovering waste and waste plastics, sorting, cleaning and drying, carrying out primary crushing and fine crushing, then carrying out double-screw extruder, setting the extrusion temperature of the double-screw extruder to be 180 ℃, putting the extruded waste PVC master batch into a stearic acid solution with the mass concentration of 7.0% at room temperature, soaking for 25min, filtering, washing and drying to obtain the waste PVC master batch;
4) heating the waste PVC master batch to 138 ℃, keeping for 12min, adding a proper amount of nano montmorillonite and porous carbon nanosheet according to 0.8% and 3% of the mass of the waste PVC master batch, then slowly heating to 182 ℃, adding a proper amount of carbon fiber and glass fiber according to 0.5% and 0.7% of the mass of the waste PVC master batch, continuously stirring for 12min, slowly cooling to room temperature, mixing with modified long-chain bismaleimide resin 5% of the mass of the waste PVC master batch and an auxiliary agent 3% of the mass of the waste PVC master batch, adding into a mixer, blending for 25min at 95 ℃ and 700r/min, banburying for 45min at 195 ℃ of an open mill, adding into an injection molding machine for injection molding, and processing and assembling to obtain the required garbage can.
Further, the adjuvant comprises the following components in parts by weight: 2.5 parts of antioxidant, 2.5 parts of plasticizer, 1.5 parts of flame retardant, 3 parts of heat stabilizer, 2 parts of lubricant and 4 parts of coupling agent.
Further, the antioxidant is an antioxidant 1010; the plasticizer is prepared by mixing di (2-ethylhexyl) phthalate, adipate and hydroxyethyl cellulose according to the mass ratio of 2:1: 3.2; the flame retardant is prepared by mixing ammonium polyphosphate, hexabromocyclododecane and zinc borate according to the mass ratio of 1:2.5: 2; the heat stabilizer is a composite rare earth stabilizer; the lubricant is PE wax; the coupling agent is a titanate coupling agent.
Example 3
A processing technology for repairing the mechanical property of a waste plastic production garbage can comprises the following specific processes:
1) adding a proper amount of cashew nut shell oil into a container, heating in an oil bath, slowly adding the bismaleimide resin under the stirring condition when the temperature reaches 120 ℃, controlling the mass ratio of the cashew nut shell oil to the bismaleimide to be 1:1.8, continuously heating to 125 ℃ when the material is gradually changed into dark brown liquid from dark purple red, reacting for 3 hours, after the reaction is finished, moving the product into an oven, and carrying out heat preservation treatment for 5 hours at 113 ℃ to obtain the modified long-chain bismaleimide resin;
2) dissolving weighed urea in deionized water according to the mass-to-volume ratio of 1:30g/mL, adding peach gum with the same mass as the urea, standing for 2d, pre-freezing the peach gum for 2h by using liquid nitrogen after the peach gum is completely swelled, freeze-drying the peach gum at-55 ℃ for 50h, then placing the peach gum in a tube furnace, carbonizing the peach gum at 580 ℃ for 2h under the protection of nitrogen, cooling the peach gum to room temperature to obtain a pre-carbonized product, adding the pre-carbonized product and potassium hydroxide into a container according to the mass ratio of 1:2.5, stirring the mixture for 3h at 160r/min, placing the mixture in an oven at 80 ℃ for overnight drying, transferring the dried product into a crucible, activating the product for 2h at 720 ℃ under the protection of nitrogen, repeatedly washing the cooled product by using hydrochloric acid, washing the product with deionized water until the porous carbon nano-sheets are neutral, and obtaining;
3) recycling waste and waste plastics, sorting, cleaning and drying, carrying out primary crushing and fine crushing, then carrying out double-screw extruder, setting the extrusion temperature of the double-screw extruder to be 185 ℃, putting the extruded waste PVC master batch into a stearic acid solution with the mass concentration of 7.5% at room temperature, soaking for 30min, filtering, washing and drying to obtain the waste PVC master batch;
4) heating the waste PVC master batch to 140 ℃, keeping for 15min, adding a proper amount of activated calcium carbonate and porous carbon nanosheets according to 1.0% and 4% of the mass of the waste PVC master batch, then slowly heating to 185 ℃, adding a proper amount of carbon fibers and glass fibers according to 0.6% and 0.8% of the mass of the waste PVC master batch, continuously stirring for 15min, slowly cooling to room temperature, mixing with modified long-chain bismaleimide resin 6% of the mass of the waste PVC master batch and an auxiliary agent 4% of the mass of the waste PVC master batch, adding into a mixer, blending for 30min at 100 ℃ and 800r/min, banburying for 50min at 200 ℃ by an open mill, adding into an injection molding machine for injection molding, and processing and assembling to obtain the required garbage can.
Further, the adjuvant comprises the following components in parts by weight: 3 parts of antioxidant, 3 parts of plasticizer, 2 parts of flame retardant, 4 parts of heat stabilizer, 3 parts of lubricant and 5 parts of coupling agent.
Further, the antioxidant is an antioxidant 1010; the plasticizer is prepared by mixing di (2-ethylhexyl) phthalate, adipate and hydroxyethyl cellulose according to the mass ratio of 2:1: 3.5; the flame retardant is prepared by mixing ammonium polyphosphate, hexabromocyclododecane and zinc borate according to the mass ratio of 1:3: 2; the heat stabilizer is hydrotalcite; the lubricant is OPE wax; the coupling agent is a silane coupling agent.
Comparative example 1
A processing technology for repairing the mechanical property of a waste plastic production garbage can comprises the following specific processes:
1) dissolving weighed urea in deionized water according to the mass-to-volume ratio of 1:20g/mL, adding peach gum with the same mass as the urea, standing for 1d, pre-freezing the peach gum by using liquid nitrogen after the peach gum is completely swelled for 1h, freeze-drying the peach gum at-45 ℃ for 45h, then placing the peach gum in a tube furnace, carbonizing the peach gum at 550 ℃ for 1h under the protection of nitrogen, cooling the peach gum to room temperature to obtain a pre-carbonized product, adding the pre-carbonized product and potassium hydroxide into a container according to the mass ratio of 1:2, stirring the mixture for 2h at 100r/min, placing the mixture in a 70 ℃ oven for overnight drying, transferring the dried product into a crucible, activating the product for 1h at 700 ℃ under the protection of nitrogen, repeatedly washing the product after cooling, washing the product with hydrochloric acid to neutral with deionized water, and drying the porous carbon nanosheet;
2) recovering waste and waste plastics, sorting, cleaning and drying, carrying out primary crushing and fine crushing, then carrying out double-screw extruder, setting the extrusion temperature of the double-screw extruder to be 175 ℃, putting the extruded waste PVC master batch into a stearic acid solution with the mass concentration of 6.5% at room temperature, soaking for 20min, filtering, washing and drying to obtain the waste PVC master batch;
3) heating the waste PVC master batch to 135 ℃, keeping the temperature for 10min, adding a proper amount of activated calcium carbonate and porous carbon nanosheets according to 0.5% and 2% of the mass of the waste PVC master batch, then slowly heating to 180 ℃, adding a proper amount of carbon fibers and glass fibers according to 0.3% and 0.5% of the mass of the waste PVC master batch, continuously stirring for 10min, slowly cooling to room temperature, mixing with an auxiliary agent 2% of the mass of the waste PVC master batch, adding into a mixer, blending for 20min at the temperature of 90 ℃ and 600r/min, banburying for 40min at the temperature of 190 ℃ by an open mill, adding into an injection molding machine for injection molding, and then processing and assembling to obtain the required garbage can.
Further, the adjuvant comprises the following components in parts by weight: 2 parts of antioxidant, 2 parts of plasticizer, 1 part of flame retardant, 2 parts of heat stabilizer, 1 part of lubricant and 3 parts of coupling agent.
Further, the antioxidant is an antioxidant 1010; the plasticizer is prepared by mixing di (2-ethylhexyl) phthalate, adipate and hydroxyethyl cellulose according to the mass ratio of 2:1: 3; the flame retardant is prepared by mixing ammonium polyphosphate, hexabromocyclododecane and zinc borate according to the mass ratio of 1:2: 2; the heat stabilizer is a calcium-zinc composite stabilizer; the lubricant is paraffin; the coupling agent is an aluminate coupling agent.
Comparative example 2
A processing technology for repairing the mechanical property of a waste plastic production garbage can comprises the following specific processes:
1) adding a proper amount of cashew nut shell oil into a container, heating in an oil bath, slowly adding the bismaleimide resin under the stirring condition when the temperature reaches 115 ℃, controlling the mass ratio of the cashew nut shell oil to the bismaleimide to be 1:1.5, continuously heating to 120 ℃ when the material is gradually changed into dark brown liquid from dark purple red, reacting for 2 hours, after the reaction is finished, moving the product into an oven, and carrying out heat preservation treatment at 108 ℃ for 4 hours to obtain the modified long-chain bismaleimide resin;
2) recovering waste and waste plastics, sorting, cleaning and drying, carrying out primary crushing and fine crushing, then carrying out double-screw extruder, setting the extrusion temperature of the double-screw extruder to be 175 ℃, putting the extruded waste PVC master batch into a stearic acid solution with the mass concentration of 6.5% at room temperature, soaking for 20min, filtering, washing and drying to obtain the waste PVC master batch;
3) heating the waste PVC master batch to 135 ℃, keeping the temperature for 10min, adding a proper amount of active calcium carbonate according to 0.5 percent of the mass of the waste PVC master batch, then slowly heating to 180 ℃, then adding a proper amount of carbon fiber and glass fiber according to 0.3 percent and 0.5 percent of the mass of the waste PVC master batch, continuously stirring for 10min, slowly cooling to room temperature, then mixing with modified long-chain bismaleimide resin accounting for 3 percent of the mass of the waste PVC master batch and an auxiliary agent accounting for 2 percent of the mass of the waste PVC master batch, adding the mixture into a mixer, blending for 20min at 90 ℃ and 600r/min, banburying for 40min at 190 ℃ by an open mill, adding the mixture into an injection molding machine, and processing and assembling to obtain the required garbage can.
Further, the adjuvant comprises the following components in parts by weight: 2 parts of antioxidant, 2 parts of plasticizer, 1 part of flame retardant, 2 parts of heat stabilizer, 1 part of lubricant and 3 parts of coupling agent.
Further, the antioxidant is an antioxidant 1010; the plasticizer is prepared by mixing di (2-ethylhexyl) phthalate, adipate and hydroxyethyl cellulose according to the mass ratio of 2:1: 3; the flame retardant is prepared by mixing ammonium polyphosphate, hexabromocyclododecane and zinc borate according to the mass ratio of 1:2: 2; the heat stabilizer is a calcium-zinc composite stabilizer; the lubricant is paraffin; the coupling agent is an aluminate coupling agent.
Comparative example 3
A processing technology for repairing the mechanical property of a waste plastic production garbage can comprises the following specific processes:
1) recovering waste and waste plastics, sorting, cleaning and drying, carrying out primary crushing and fine crushing, then carrying out double-screw extruder, setting the extrusion temperature of the double-screw extruder to be 175 ℃, putting the extruded waste PVC master batch into a stearic acid solution with the mass concentration of 6.5% at room temperature, soaking for 20min, filtering, washing and drying to obtain the waste PVC master batch;
2) heating the waste PVC master batch to 135 ℃, keeping the temperature for 10min, adding a proper amount of active calcium carbonate according to 0.5 percent of the mass of the waste PVC master batch, then slowly heating to 180 ℃, then adding a proper amount of carbon fiber and glass fiber according to 0.3 percent and 0.5 percent of the mass of the waste PVC master batch, continuously stirring for 10min, slowly cooling to room temperature, then mixing with an auxiliary agent 2 percent of the mass of the waste PVC master batch, adding into a mixer, blending for 20min under the conditions of 90 ℃ and 600r/min, banburying for 40min at 190 ℃ by an open mill, adding into an injection molding machine for injection molding, and then processing and assembling to obtain the required garbage can.
Further, the adjuvant comprises the following components in parts by weight: 2 parts of antioxidant, 2 parts of plasticizer, 1 part of flame retardant, 2 parts of heat stabilizer, 1 part of lubricant and 3 parts of coupling agent.
Further, the antioxidant is an antioxidant 1010; the plasticizer is prepared by mixing di (2-ethylhexyl) phthalate, adipate and hydroxyethyl cellulose according to the mass ratio of 2:1: 3; the flame retardant is prepared by mixing ammonium polyphosphate, hexabromocyclododecane and zinc borate according to the mass ratio of 1:2: 2; the heat stabilizer is a calcium-zinc composite stabilizer; the lubricant is paraffin; the coupling agent is an aluminate coupling agent.
Control group
Putting the primary PVC master batch into a stearic acid solution with the mass concentration of 6.5% at room temperature, soaking for 20min, filtering, washing, drying, heating to 135 ℃ for 10min, adding a proper amount of active calcium carbonate according to 0.5% of the primary PVC master batch, slowly heating to 180 ℃, adding a proper amount of carbon fiber and glass fiber according to 0.3% and 0.5% of the primary PVC master batch, continuously stirring for 10min, slowly cooling to room temperature, mixing with an auxiliary agent with the mass of 2% of the primary PVC master batch, adding into a mixer, blending for 20min at 90 ℃ and 600r/min, banburying for 40min at 190 ℃ by an open mill, adding into an injection molding machine, injection molding, and processing and assembling to obtain the required garbage can.
Further, the adjuvant comprises the following components in parts by weight: 2 parts of antioxidant, 2 parts of plasticizer, 1 part of flame retardant, 2 parts of heat stabilizer, 1 part of lubricant and 3 parts of coupling agent.
Further, the antioxidant is an antioxidant 1010; the plasticizer is prepared by mixing di (2-ethylhexyl) phthalate, adipate and hydroxyethyl cellulose according to the mass ratio of 2:1: 3; the flame retardant is prepared by mixing ammonium polyphosphate, hexabromocyclododecane and zinc borate according to the mass ratio of 1:2: 2; the heat stabilizer is a calcium-zinc composite stabilizer; the lubricant is paraffin; the coupling agent is an aluminate coupling agent.
Test experiments
Referring to the determination method of GB/T1043-1993 hard plastic simple beam impact test method, plastic parts are prepared by adopting the process methods and raw material processing provided by examples 1-3 and comparative examples 1-3 and a comparison group, and then the plastic parts are subjected to performance test of unnotched sample impact strength and notched sample impact strength (type B notch), the repair condition of the impact strength mechanical property of the waste PVC plastic parts is calculated, the unnotched sample impact strength and notched sample impact strength of the raw PVC plastic parts in the comparison group are taken as comparison values, and compared with the unnotched sample impact strength and notched sample impact strength of the plastic parts in examples 1-3 and comparative examples 1-3, the results are as follows: the plastic part in example 1 had a unnotched impact strength of 96.8% and a notched impact strength of 94.7% of the plastic part in the control group; in the plastic part in example 2, the unnotched impact strength reached 97.3% of that of the plastic part in the control group, and the notched impact strength reached 95.1% of that of the plastic part in the control group; the plastic part in example 3 had a unnotched impact strength of 96.2% and a notched impact strength of 94.0% of the plastic part in the control group; the plastic part in comparative example 1 had unnotched impact strength of 85.6% of the plastic part in the control, and notched impact strength of 83.4% of the plastic part in the control; the plastic part in comparative example 2 had a unnotched impact strength of 77.8% and a notched impact strength of 76.3% of the plastic part in the control; the plastic part of comparative example 3 had a unnotched impact strength of 63.2% and a notched impact strength of 61.5% of the plastic part of the control.
The test results show that the process method provided by the invention can enable the impact strength of the waste PVC plastic to reach more than 94% of that of the original PVC plastic, and basically can reach the mechanical property similar to that of the original plastic product, thereby being beneficial to realizing the efficient utilization of the waste plastic.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.

Claims (8)

1. A processing technology for repairing the mechanical property of a waste plastic production garbage can is characterized by comprising the following specific processes:
1) adding a proper amount of cashew nut shell oil into a container, heating in an oil bath, slowly adding the bismaleimide resin under the stirring condition when the temperature reaches 120 ℃ of 115-;
2) weighing a proper amount of urea, dissolving the urea in deionized water, adding a certain amount of peach gum, standing for 1-2d, pre-freezing the peach gum for 1-2h by using liquid nitrogen after the peach gum is completely swelled, freeze-drying the peach gum, then placing the peach gum in a tubular furnace, carbonizing the peach gum for 1-2h under the protection of nitrogen, cooling to room temperature to obtain a pre-carbonized product, adding the pre-carbonized product and potassium hydroxide into a container according to a certain mass ratio, stirring for 2-3h, then placing the container in an oven for overnight drying, transferring the dried product into a crucible, activating the crucible for 1-2h under the protection of nitrogen, cooling, repeatedly washing the product with hydrochloric acid, washing the product with deionized water to be neutral, and drying to obtain a porous carbon nanosheet;
3) recovering waste and waste plastics, carrying out sorting, cleaning and drying treatment, carrying out primary crushing and fine crushing, then carrying out double-screw extruder, setting the extrusion temperature of the double-screw extruder to be 175-;
4) heating the waste PVC master batch to the temperature of 135-140 ℃ for 10-15min, adding a proper amount of filler and porous carbon nanosheets, slowly heating to the temperature of 180-185 ℃, adding a proper amount of carbon fibers and glass fibers, continuously stirring for 10-15min, slowly cooling to room temperature, mixing with the modified long-chain bismaleimide resin and the auxiliary agent, adding into a mixer for blending, carrying out high-temperature banburying in an open mill for a period of time, adding into an injection molding machine for injection molding, and then processing and assembling to obtain the required garbage can.
2. The processing technology for repairing the mechanical property of the waste plastic production garbage can as claimed in claim 1, wherein in the processing step 1), the mass ratio of the cashew nut shell oil to the bismaleimide is 1: 1.5-1.8.
3. The processing technology for repairing the mechanical property of the waste plastic production garbage can as claimed in claim 1, wherein in the process step 2), the mass-to-volume ratio of the urea to the deionized water is 1:20-30 g/mL; the peach gum and the urea have equal mass; the mass ratio of the pre-carbonized product to the potassium hydroxide is 1: 2-2.5.
4. The processing technology for repairing the mechanical property of the waste plastic production garbage can as claimed in claim 1, characterized in that in the process step 2), the temperature of the freeze drying is-45 to-55 ℃, and the freezing time is 45 to 50 hours; the temperature of the carbonization treatment is 550-580 ℃; the rotating speed is 100-160 r/min; the drying temperature is 70-80 ℃; the temperature of the activation treatment is 700-720 ℃.
5. The processing technology for repairing the mechanical property of the waste plastic production garbage can as claimed in claim 1, characterized in that in the process step 4), the filler is at least one of activated calcium carbonate and nano montmorillonite; the addition amount of the filler is 0.5-1.0% of the mass of the waste PVC master batch; the adding amount of the porous carbon nanosheets is 2-4% of the mass of the waste PVC master batch; the using amounts of the carbon fiber and the glass fiber respectively account for 0.3-0.6% and 0.5-0.8% of the mass of the waste PVC master batch; the dosage of the modified long-chain bismaleimide resin and the adjuvant respectively accounts for 3-6% and 2-4% of the mass of the waste PVC master batch.
6. The processing technology for repairing the mechanical property of the waste plastic production garbage can as claimed in claim 1, wherein in the process step 4), the stirring speed of the mixer is 800r/min, the stirring temperature is 90-100 ℃, and the stirring time is 20-30 min; the temperature of the internal mixer is 190-200 ℃, and the internal mixing time is 40-50 min.
7. The processing technology for repairing the mechanical property of the waste plastic production garbage can according to claim 1, characterized in that in the process step 4), the auxiliary agent comprises the following components in parts by weight: 2-3 parts of antioxidant, 2-3 parts of plasticizer, 1-2 parts of flame retardant, 2-4 parts of heat stabilizer, 1-3 parts of lubricant and 3-5 parts of coupling agent.
8. The processing technology for repairing the mechanical property of the waste plastic production garbage can as claimed in claim 7, wherein the antioxidant is antioxidant 1010; the plasticizer is prepared by mixing di (2-ethylhexyl) phthalate, adipate and hydroxyethyl cellulose according to the mass ratio of 2:1: 3-3.5; the flame retardant is prepared by mixing ammonium polyphosphate, hexabromocyclododecane and zinc borate according to the mass ratio of 1:2-3: 2; the heat stabilizer is one or more of a calcium-zinc composite stabilizer, a composite rare earth stabilizer and hydrotalcite; the lubricant is one or more of paraffin wax, PE wax and OPE wax; the coupling agent is one or more of aluminate coupling agent, titanate coupling agent and silane coupling agent.
CN202011087661.4A 2020-10-13 2020-10-13 Processing technology for repairing mechanical property of waste plastic production garbage can Withdrawn CN112175325A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI823653B (en) * 2022-04-06 2023-11-21 聚量應用材料股份有限公司 Processing methods for composite recycled PET

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI823653B (en) * 2022-04-06 2023-11-21 聚量應用材料股份有限公司 Processing methods for composite recycled PET

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