CN113896935A - Micropore foaming recycling process for waste injection molding products - Google Patents
Micropore foaming recycling process for waste injection molding products Download PDFInfo
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- CN113896935A CN113896935A CN202111413645.4A CN202111413645A CN113896935A CN 113896935 A CN113896935 A CN 113896935A CN 202111413645 A CN202111413645 A CN 202111413645A CN 113896935 A CN113896935 A CN 113896935A
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 71
- 239000002699 waste material Substances 0.000 title claims abstract description 36
- 238000004064 recycling Methods 0.000 title claims abstract description 34
- 238000005187 foaming Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 80
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000001035 drying Methods 0.000 claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 24
- 239000012153 distilled water Substances 0.000 claims abstract description 17
- 239000003054 catalyst Substances 0.000 claims abstract description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims description 36
- 239000007924 injection Substances 0.000 claims description 36
- 239000004088 foaming agent Substances 0.000 claims description 25
- 239000000243 solution Substances 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000004156 Azodicarbonamide Substances 0.000 claims description 10
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 10
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 229920001684 low density polyethylene Polymers 0.000 claims description 10
- 239000004702 low-density polyethylene Substances 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010790 dilution Methods 0.000 claims description 5
- 239000012895 dilution Substances 0.000 claims description 5
- 230000000694 effects Effects 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000005185 salting out Methods 0.000 claims description 5
- 229920006395 saturated elastomer Polymers 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000001125 extrusion Methods 0.000 description 7
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 230000003749 cleanliness Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 239000010865 sewage Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- 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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
-
- 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
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
-
- 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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- 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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Chemical & Material Sciences (AREA)
- Polymers & Plastics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Organic Chemistry (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention provides a micropore foaming recycling process for waste injection molding products, which comprises the following steps: s1, placing the waste injection molding products into a recycling box, and cleaning and crushing the waste injection molding products by the recycling box; s2, placing the crushed and cleaned injection molding product in a drying oven for drying treatment for 0.5-1 h; s3, placing the crushed injection molding product into a high-speed mixer, mixing with a certain amount of 98% concentrated sulfuric acid and a catalyst (the ratio is about 10: 70: 1), and adding water with the temperature of 80 ℃ into the high-speed mixer. According to the invention, the injection molding product is cleaned, crushed and dried through the recycling bin and the drying bin, 98% concentrated sulfuric acid, a catalyst and water are added into the high-speed mixer for mixing, so that the injection molding product can be conveniently and rapidly melted, and the melted recycled materials are diluted and filtered by adding distilled water, so that the impurities in the recycled materials are further filtered, the recycling efficiency of the injection molding waste is avoided, and the product quality of the injection molding waste is ensured to be improved.
Description
Technical Field
The invention relates to the technical field of recycling of waste injection molding products, in particular to a micropore foaming recycling process of a waste injection molding product.
Background
Injection molding is a method for producing moldings from industrial products, which generally use rubber injection molding and plastic injection molding. The injection molding can also be divided into an injection molding die pressing method and a die casting method, wherein an injection molding machine is main molding equipment for manufacturing thermoplastic plastics or thermosetting plastics into plastic products with various shapes by using a plastic molding die, the injection molding is realized by an injection molding machine and the die, and when the injection molding products are produced, burrs produced and defective products produced are collectively called waste injection molding products;
when the existing waste injection molding product is recycled, the external cleaning part and the internal impurities of the injection molding product cannot be thoroughly removed, so that the product quality of the waste gas injection molding product is reduced, and the product cannot be used.
Disclosure of Invention
The object of the present invention is to provide a stabilization method and stabilizer mixture for recycling injection molding waste to solve the problems set forth in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a micropore foaming recycling process for waste injection molding products comprises the following steps:
s1, placing the waste injection molding products into a recycling box, and cleaning and crushing the waste injection molding products by the recycling box;
s2, placing the crushed and cleaned injection molding product in a drying oven for drying treatment for 0.5-1 h;
s3, putting the crushed injection molding product into a high-speed mixer, mixing with a certain amount of 98% concentrated sulfuric acid and a catalyst (the ratio is about 10: 70: 1), adding water with the temperature of 80 ℃ into the high-speed mixer, heating in a water bath, and blending for 1-3h to obtain a reclaimed material;
s4, adding a certain amount of distilled water into the obtained reclaimed materials for dilution until the pH of the distilled water washing liquid is =7-8, stirring, dissolving and filtering the dough-like objects, salting out the dough-like objects by using 2% saturated CaCl, adding a proper amount of excessive NaOH solution into the reclaimed materials, filtering, purifying and drying (drying for 3-5h at 105 ℃) to obtain clean reclaimed materials;
s5, extruding and granulating the clean reclaimed materials through a double-screw extruder to obtain reclaimed material master batches;
s6, placing the azodicarbonamide foaming agent and the low-density polyethylene in a high-speed mixer according to the mass ratio of 1: 4-1: 10, and mixing for 5-30min to obtain a well-blended foaming agent mixture;
s7, extruding and granulating the blended foaming agent mixture through a double-screw extruder to obtain foaming master batches, mixing the foaming master batches and the reclaimed material master batches according to the mass ratio of 1: 20-1: 50, and performing injection molding through an injection molding machine to obtain the microporous foaming material.
As further preferable in the present technical solution: in S1, the surface of the exhaust gas injection molded article is cleaned to remove the adhering substance and is crushed.
As further preferable in the present technical solution: and S2, drying the broken injection molding product at the drying temperature of 50-70 ℃ for 10-30 min, and removing water above the injection molding product, so that the injection molding product is convenient to process.
As further preferable in the present technical solution: in S3, the crushed injection-molded product, concentrated sulfuric acid, a catalyst, and water are mixed at a high speed by a high-speed mixer, thereby improving the efficiency of melting the injection-molded product.
As further preferable in the present technical solution: in the step S4, the reclaimed materials are filtered after being added with distilled water, so that impurities in the dissolved dough can be conveniently removed, and the clean materials of the dissolved dough are obtained.
As further preferable in the present technical solution: in the step S5, when the reclaimed materials are extruded from the twin-screw extruder, the reclaimed materials are melted by the friction of the twin-screws during extrusion, so that the reclaimed materials can be conveniently extruded.
As further preferable in the present technical solution: in S6, the azodicarbonamide foaming agent and the low-density polyethylene are mixed at high speed by a high-speed mixer to be more thoroughly mixed, thereby obtaining a foaming agent mixture with better use effect.
As further preferable in the present technical solution: in the S7, the injection temperature is 180-220 ℃, the injection pressure is 30-90MPa, and the cooling time is 10-40S.
Due to the adoption of the technical scheme, the embodiment of the invention has the following advantages:
according to the invention, the injection molding product is cleaned, crushed and dried through the recycling bin and the drying bin, 98% concentrated sulfuric acid, a catalyst and water are added into the high-speed mixer for mixing, so that the injection molding product can be conveniently and rapidly melted, and the melted recycled materials are diluted and filtered by adding distilled water, so that the impurities in the recycled materials are further filtered, the recycling efficiency of the injection molding waste is avoided, and the product quality of the injection molding waste is ensured to be improved.
The foregoing summary is provided for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the drawings and following detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or technical descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of the steps of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Referring to fig. 1, the present invention provides a technical solution: a micropore foaming recycling process for waste injection molding products comprises the following steps:
s1, placing the waste injection molding products into a recycling box, and cleaning and crushing the waste injection molding products by the recycling box;
s2, placing the crushed and cleaned injection molding product in a drying oven for drying treatment for 0.5 h;
s3, placing the crushed injection molding product into a high-speed mixer, mixing with a certain amount of 98% concentrated sulfuric acid and a catalyst (the ratio is about 10: 70: 1), adding water with the temperature of 80 ℃ into the high-speed mixer, and heating and blending in a water bath for 1h to obtain a reclaimed material;
s4, adding a certain amount of distilled water into the obtained reclaimed materials for dilution until the pH of the distilled water washing liquid is =7, stirring, dissolving the dough, filtering, salting out with 2% saturated CaCl, adding a proper amount of excess NaOH solution into the reclaimed materials, filtering, purifying and drying (drying for 3 hours at 105 ℃) to obtain clean reclaimed materials;
s5, extruding and granulating the clean reclaimed materials through a double-screw extruder to obtain reclaimed material master batches;
s6, placing the azodicarbonamide foaming agent and the low-density polyethylene in a high-speed mixer according to the mass ratio of 1:4, and mixing for 15min to obtain a well-blended foaming agent mixture;
and S7, extruding and granulating the blended foaming agent mixture through a double-screw extruder to obtain foaming master batches, mixing the foaming master batches and the reclaimed material master batches according to the mass ratio of 1:20, and performing injection molding through an injection molding machine to obtain the microcellular foaming material.
In this embodiment, in S1, the attachments on the surface of the exhaust gas injection molded article are cleaned and removed, and are crushed, so that the cleanliness and the melting rate of the injection molded article can be improved by cleaning and crushing the attachments on the surface of the injection molded article.
In this embodiment, in S2, the broken injection molded article is dried at 50 ℃ for 10min, and water above the injection molded article is removed, so that the injection molded article is convenient to process, and the broken injection molded article is dried to prevent residual sewage on the injection molded article from affecting the production quality.
In this example, in S3, the crushed injection-molded article, concentrated sulfuric acid, a catalyst, and water are mixed at a high speed by a high-speed mixer, thereby improving the efficiency of melting the injection-molded article.
In this embodiment, in S4, the reclaimed materials are filtered after being added with distilled water, so as to conveniently remove impurities inside the dissolved dough, thereby obtaining a material with a clean dissolved dough, and the reclaimed materials are further filtered, thereby improving the cleanliness of the reclaimed materials and ensuring the production quality.
In this embodiment, in S5, when extruding the recycled material in the twin-screw extruder, the recycled material is melted by the mutual extrusion friction of the double screws, so that the recycled material is conveniently extruded, and the efficiency of extruding the recycled material is improved by the mutual extrusion friction of the recycled material in the double screws.
In this example, in S6, the azodicarbonamide foaming agent and the low-density polyethylene were mixed at high speed by a high-speed mixer to obtain a more sufficient mixing, and a foaming agent mixture having a better use effect was obtained.
In this example, in S7, the injection temperature was 180 ℃, the injection pressure was 30MPa, and the cooling time was 10 seconds.
Example two
Referring to fig. 1, the present invention provides a technical solution: a micropore foaming recycling process for waste injection molding products comprises the following steps:
s1, placing the waste injection molding products into a recycling box, and cleaning and crushing the waste injection molding products by the recycling box;
s2, placing the crushed and cleaned injection molding product in a drying oven for drying treatment for 0.8 h;
s3, placing the crushed injection molding product into a high-speed mixer, mixing with a certain amount of 98% concentrated sulfuric acid and a catalyst (the ratio is about 10: 70: 1), adding water with the temperature of 80 ℃ into the high-speed mixer, heating in a water bath, and blending for 2 hours to obtain a reclaimed material;
s4, adding a certain amount of distilled water into the obtained reclaimed materials for dilution until the pH of the distilled water washing liquid is =7.5, stirring, dissolving and filtering the dough-like objects, salting out the dough-like objects by using 2% saturated CaCl, adding a proper amount of excessive NaOH solution into the reclaimed materials, filtering, purifying and drying (drying for 4 hours at 105 ℃) to obtain clean reclaimed materials;
s5, extruding and granulating the clean reclaimed materials through a double-screw extruder to obtain reclaimed material master batches;
s6, placing the azodicarbonamide foaming agent and the low-density polyethylene in a high-speed mixer according to the mass ratio of 1:8 for 20min to obtain a well-blended foaming agent mixture;
and S7, extruding and granulating the blended foaming agent mixture through a double-screw extruder to obtain foaming master batches, mixing the foaming master batches and the reclaimed material master batches according to the mass ratio of 1:35, and performing injection molding through an injection molding machine to obtain the microcellular foaming material.
In this embodiment, in S1, the attachments on the surface of the exhaust gas injection molded article are cleaned and removed, and are crushed, so that the cleanliness and the melting rate of the injection molded article can be improved by cleaning and crushing the attachments on the surface of the injection molded article.
In this embodiment, in S2, the broken injection molded article is dried at 60 ℃ for 20min, and water above the injection molded article is removed, so that the injection molded article is convenient to process, and the broken injection molded article is dried to prevent the injection molded article from being polluted by residual sewage and affecting the production quality.
In this example, in S3, the crushed injection-molded article, concentrated sulfuric acid, a catalyst, and water are mixed at a high speed by a high-speed mixer, thereby improving the efficiency of melting the injection-molded article.
In this embodiment, in S4, the reclaimed materials are filtered after being added with distilled water, so as to conveniently remove impurities inside the dissolved dough, thereby obtaining a material with a clean dissolved dough, and the reclaimed materials are further filtered, thereby improving the cleanliness of the reclaimed materials and ensuring the production quality.
In this embodiment, in S5, when extruding the recycled material in the twin-screw extruder, the recycled material is melted by the mutual extrusion friction of the double screws, so that the recycled material is conveniently extruded, and the efficiency of extruding the recycled material is improved by the mutual extrusion friction of the recycled material in the double screws.
In this example, in S6, the azodicarbonamide foaming agent and the low-density polyethylene were mixed at high speed by a high-speed mixer to obtain a more sufficient mixing, and a foaming agent mixture having a better use effect was obtained.
In this example, in S7, the injection temperature was 200 ℃, the injection pressure was 50MPa, and the cooling time was 25S.
EXAMPLE III
Referring to fig. 1, the present invention provides a technical solution: a micropore foaming recycling process for waste injection molding products comprises the following steps:
s1, placing the waste injection molding products into a recycling box, and cleaning and crushing the waste injection molding products by the recycling box;
s2, placing the crushed and cleaned injection molding product in a drying oven for drying for 1 h;
s3, placing the crushed injection molding product into a high-speed mixer, mixing with a certain amount of 98% concentrated sulfuric acid and a catalyst (the ratio is about 10: 70: 1), adding water with the temperature of 80 ℃ into the high-speed mixer, and heating and blending in a water bath for 3 hours to obtain a reclaimed material;
s4, adding a certain amount of distilled water into the obtained reclaimed materials for dilution until the pH of the distilled water washing liquid is =8, stirring, dissolving the dough, filtering, salting out with 2% saturated CaCl, adding a proper amount of excess NaOH solution into the reclaimed materials, filtering, purifying and drying (drying for 5 hours at 105 ℃) to obtain clean reclaimed materials;
s5, extruding and granulating the clean reclaimed materials through a double-screw extruder to obtain reclaimed material master batches;
s6, placing the azodicarbonamide foaming agent and the low-density polyethylene in a high-speed mixer according to the mass ratio of 1:10 for 30min to obtain a well-blended foaming agent mixture;
and S7, extruding and granulating the blended foaming agent mixture through a double-screw extruder to obtain foaming master batches, mixing the foaming master batches and the reclaimed material master batches according to the mass ratio of 1:50, and performing injection molding through an injection molding machine to obtain the microcellular foaming material.
In this embodiment, in S1, the attachments on the surface of the exhaust gas injection molded article are cleaned and removed, and are crushed, so that the cleanliness and the melting rate of the injection molded article can be improved by cleaning and crushing the attachments on the surface of the injection molded article.
In this embodiment, in S2, the broken injection molded article is dried at 70 ℃ for 30min, and water above the injection molded article is removed, so that the injection molded article is convenient to process, and the broken injection molded article is dried to prevent residual sewage on the injection molded article from affecting the production quality.
In this example, in S3, the crushed injection-molded article, concentrated sulfuric acid, a catalyst, and water are mixed at a high speed by a high-speed mixer, thereby improving the efficiency of melting the injection-molded article.
In this embodiment, in S4, the reclaimed materials are filtered after being added with distilled water, so as to conveniently remove impurities inside the dissolved dough, thereby obtaining a material with a clean dissolved dough, and the reclaimed materials are further filtered, thereby improving the cleanliness of the reclaimed materials and ensuring the production quality.
In this embodiment, in S5, when extruding the recycled material in the twin-screw extruder, the recycled material is melted by the mutual extrusion friction of the double screws, so that the recycled material is conveniently extruded, and the efficiency of extruding the recycled material is improved by the mutual extrusion friction of the recycled material in the double screws.
In this example, in S6, the azodicarbonamide foaming agent and the low-density polyethylene were mixed at high speed by a high-speed mixer to obtain a more sufficient mixing, and a foaming agent mixture having a better use effect was obtained.
In this example, in S7, the injection temperature was 220 ℃, the injection pressure was 90MPa, and the cooling time was 40S.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various changes or substitutions within the technical scope of the present invention, and these should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A micropore foaming recycling process for waste injection molding products is characterized by comprising the following steps:
s1, placing the waste injection molding products into a recycling box, and cleaning and crushing the waste injection molding products by the recycling box;
s2, placing the crushed and cleaned injection molding product in a drying oven for drying treatment for 0.5-1 h;
s3, putting the crushed injection molding product into a high-speed mixer, mixing with a certain amount of 98% concentrated sulfuric acid and a catalyst (the ratio is about 10: 70: 1), adding water with the temperature of 80 ℃ into the high-speed mixer, heating in a water bath, and blending for 1-3h to obtain a reclaimed material;
s4, adding a certain amount of distilled water into the obtained reclaimed materials for dilution until the pH of the distilled water washing liquid is =7-8, stirring, dissolving and filtering the dough-like objects, salting out the dough-like objects by using 2% saturated CaCl, adding a proper amount of excessive NaOH solution into the reclaimed materials, filtering, purifying and drying (drying for 3-5h at 105 ℃) to obtain clean reclaimed materials;
s5, extruding and granulating the clean reclaimed materials through a double-screw extruder to obtain reclaimed material master batches;
s6, placing the azodicarbonamide foaming agent and the low-density polyethylene in a high-speed mixer according to the mass ratio of 1: 4-1: 10, and mixing for 5-30min to obtain a well-blended foaming agent mixture;
s7, extruding and granulating the blended foaming agent mixture through a double-screw extruder to obtain foaming master batches, mixing the foaming master batches and the reclaimed material master batches according to the mass ratio of 1: 20-1: 50, and performing injection molding through an injection molding machine to obtain the microporous foaming material.
2. The microcellular foaming recycling process for waste injection-molded products according to claim 1, wherein: in S1, the surface of the exhaust gas injection molded article is cleaned to remove the adhering substance and is crushed.
3. The microcellular foaming recycling process for waste injection-molded products according to claim 1, wherein: and S2, drying the broken injection molding product at the drying temperature of 50-70 ℃ for 10-30 min, and removing water above the injection molding product.
4. The microcellular foaming recycling process for waste injection-molded products according to claim 1, wherein: in S3, the crushed injection-molded article, concentrated sulfuric acid, a catalyst and water are mixed at a high speed by a high-speed mixer.
5. The microcellular foaming recycling process for waste injection-molded products according to claim 1, wherein: in the step S4, the reclaimed materials are filtered after being added with distilled water, so that impurities in the dissolved dough can be conveniently removed, and the clean materials of the dissolved dough are obtained.
6. The microcellular foaming recycling process for waste injection-molded products according to claim 1, wherein: in S5, when the reclaimed material is extruded from the twin-screw extruder, the reclaimed material is melted by the friction of the twin-screws with each other.
7. The microcellular foaming recycling process for waste injection-molded products according to claim 1, wherein: in S6, the azodicarbonamide foaming agent and the low-density polyethylene are mixed at high speed by a high-speed mixer to be more thoroughly mixed, thereby obtaining a foaming agent mixture with better use effect.
8. The microcellular foaming recycling process for waste injection-molded products according to claim 1, wherein: in the S7, the injection temperature is 180-220 ℃, the injection pressure is 30-90MPa, and the cooling time is 10-40S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111413645.4A CN113896935A (en) | 2021-11-25 | 2021-11-25 | Micropore foaming recycling process for waste injection molding products |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111413645.4A CN113896935A (en) | 2021-11-25 | 2021-11-25 | Micropore foaming recycling process for waste injection molding products |
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| KR19990023168A (en) * | 1997-08-28 | 1999-03-25 | 윤종용 | Recycling method for packaging cushioning materials, mixed regeneration pellets and injection molded products |
| CN104262779A (en) * | 2014-09-15 | 2015-01-07 | 武汉理工大学 | Method for recycling retired car polyolefin plastic parts and components by virtue of chemical foaming |
| CN110243642A (en) * | 2019-06-19 | 2019-09-17 | 南京大学 | The method of micro- plastics is extracted in a kind of human and animal excreta |
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|---|---|---|---|---|
| KR19990023168A (en) * | 1997-08-28 | 1999-03-25 | 윤종용 | Recycling method for packaging cushioning materials, mixed regeneration pellets and injection molded products |
| CN104262779A (en) * | 2014-09-15 | 2015-01-07 | 武汉理工大学 | Method for recycling retired car polyolefin plastic parts and components by virtue of chemical foaming |
| CN110243642A (en) * | 2019-06-19 | 2019-09-17 | 南京大学 | The method of micro- plastics is extracted in a kind of human and animal excreta |
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