CN109176969B - Waste plastic recovery method - Google Patents
Waste plastic recovery method Download PDFInfo
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- CN109176969B CN109176969B CN201810990899.4A CN201810990899A CN109176969B CN 109176969 B CN109176969 B CN 109176969B CN 201810990899 A CN201810990899 A CN 201810990899A CN 109176969 B CN109176969 B CN 109176969B
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- waste plastic
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- 229920003023 plastic Polymers 0.000 title claims abstract description 108
- 239000004033 plastic Substances 0.000 title claims abstract description 108
- 239000002699 waste material Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000011084 recovery Methods 0.000 title abstract description 4
- 239000002904 solvent Substances 0.000 claims abstract description 38
- 239000002131 composite material Substances 0.000 claims abstract description 31
- 230000008961 swelling Effects 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 238000000576 coating method Methods 0.000 claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 17
- 238000004064 recycling Methods 0.000 claims abstract description 12
- 238000000748 compression moulding Methods 0.000 claims abstract description 11
- 239000003960 organic solvent Substances 0.000 claims abstract description 10
- 238000013467 fragmentation Methods 0.000 claims abstract description 7
- 238000006062 fragmentation reaction Methods 0.000 claims abstract description 7
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 42
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 42
- JLTDJTHDQAWBAV-UHFFFAOYSA-N N,N-dimethylaniline Chemical compound CN(C)C1=CC=CC=C1 JLTDJTHDQAWBAV-UHFFFAOYSA-N 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 19
- 239000002002 slurry Substances 0.000 claims description 19
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 18
- 239000005341 toughened glass Substances 0.000 claims description 18
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 15
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical group C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 15
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 15
- 238000007493 shaping process Methods 0.000 claims description 15
- -1 tertiary amine organic compound Chemical class 0.000 claims description 15
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 claims description 12
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 claims description 12
- 239000000178 monomer Substances 0.000 claims description 12
- 238000000465 moulding Methods 0.000 claims description 12
- 239000000049 pigment Substances 0.000 claims description 11
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- SUPCQIBBMFXVTL-UHFFFAOYSA-N ethyl 2-methylprop-2-enoate Chemical compound CCOC(=O)C(C)=C SUPCQIBBMFXVTL-UHFFFAOYSA-N 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- 239000003999 initiator Substances 0.000 claims description 6
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 6
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 6
- 239000000347 magnesium hydroxide Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 125000000864 peroxy group Chemical group O(O*)* 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- VDMLVOIDGSOUTA-UHFFFAOYSA-N 2-(4-methylanilino)ethane-1,1-diol Chemical compound CC1=CC=C(NCC(O)O)C=C1 VDMLVOIDGSOUTA-UHFFFAOYSA-N 0.000 claims description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- OXCNCSRAUQIXSP-UHFFFAOYSA-N n,n-dihydroxy-4-methyl-2-propylaniline Chemical compound CCCC1=CC(C)=CC=C1N(O)O OXCNCSRAUQIXSP-UHFFFAOYSA-N 0.000 claims description 5
- 239000004209 oxidized polyethylene wax Substances 0.000 claims description 5
- 235000013873 oxidized polyethylene wax Nutrition 0.000 claims description 5
- 239000011259 mixed solution Substances 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 3
- 239000012934 organic peroxide initiator Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000007790 scraping Methods 0.000 claims description 2
- 238000001723 curing Methods 0.000 claims 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 abstract description 5
- 230000001070 adhesive effect Effects 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 231100000053 low toxicity Toxicity 0.000 abstract description 3
- 239000007888 film coating Substances 0.000 abstract description 2
- 238000009501 film coating Methods 0.000 abstract description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 10
- 239000001023 inorganic pigment Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 239000004408 titanium dioxide Substances 0.000 description 5
- JUVSRZCUMWZBFK-UHFFFAOYSA-N 2-[n-(2-hydroxyethyl)-4-methylanilino]ethanol Chemical compound CC1=CC=C(N(CCO)CCO)C=C1 JUVSRZCUMWZBFK-UHFFFAOYSA-N 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000010812 mixed waste Substances 0.000 description 3
- ZESLOSHYKLNWEC-UHFFFAOYSA-N 3-(4-methylanilino)propane-1,1-diol Chemical compound CC1=CC=C(NCCC(O)O)C=C1 ZESLOSHYKLNWEC-UHFFFAOYSA-N 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B2017/001—Pretreating the materials before recovery
-
- 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
- Y02W30/52—Mechanical processing of waste for the recovery of materials, e.g. crushing, shredding, separation or disassembly
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Processing Of Solid Wastes (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a waste plastic recovery method, which comprises the working procedures of waste plastic fragmentation treatment, presoaking swelling, free-state composite active solvent removal, compression molding, vacuum curing, cooling demolding, surface film coating and the like. The method has the advantages of simple process for recycling waste plastics, low equipment investment, low energy consumption, low pollution, low toxicity, low cost and the like. The prepared plastic plate has the advantages of reduced use amount of organic solvent, excellent glossiness and shore hardness, wear resistance and adhesive force performance after surface coating. The method has the advantages of simple process for recycling waste plastics, low equipment investment, low energy consumption, low pollution, low toxicity, low cost and the like. The prepared plastic plate can be polished at will, can be comparable to the acrylic panel on the market at present, can be applied to replace high-grade places such as curtain wall plates, acrylic plates and the like, and has high added value.
Description
Technical Field
The invention relates to a waste treatment technology, in particular to a waste plastic recycling method, and belongs to the field of plastics.
Background
At present, people pay more and more attention to the resource recycling technology of waste plastics. It includes the recovery and reuse technology of mixed waste plastics and waste plastics of single variety. Wherein, the recycling technology of the mixed waste plastics comprises dissolving and preparing coating and adhesive, pyrolysis and oiling, burning and power generation and the like; the technology for recycling single waste plastics includes producing paint, adhesive and plate by mechanical blending method, solvent dissolving method and hot melting method. Particularly for producing plates, waste plastics need to be sorted, and the sorting work is very complicated; if the mixed waste plastics are used for producing the plate, the problems of different colors and performances exist, and particularly, the use of the plate is seriously influenced due to great batch production difference of the colors. In addition, the organic solvent has large usage amount and some toxicity.
Disclosure of Invention
The invention aims to provide a method for recycling waste plastics, which aims to adopt mixed plastics to produce plates, solve the problem of surface color consistency of the plates, achieve high light performance, and improve the decorative effect and the use grade of the plates on the basis of reducing the pretreatment process of the waste plastics, reducing the production cost.
The invention is realized by the following technical scheme.
A method for recycling waste plastic, comprising the steps of:
1) fragmentation treatment of waste plastics
Crushing the waste plastics into millimeter-sized particles by a plastic crusher;
2) presoaking swelling
Immersing the waste plastics in the composite active solvent for 1-3h to obtain blocky waste plastics swelling bodies in the composite active solvent;
3) free state complex active solvent removal
Separating the massive waste plastic swelling body immersed in the composite active solvent from the free composite active solvent in a vibration mode;
4) compression molding
Putting the waste plastic swelling body into toughened glass, performing compression molding, and tightening a clamp;
5) vacuum curing
Curing and shaping in an oven with a vacuum degree of 0.07-0.09Mpa at 30-40 deg.C for 2-4h, replacing the upper template with frame-shaped toughened glass, tightening the fixture, and curing and shaping in an oven with a vacuum degree of 0.07-0.09Mpa at 60-80 deg.C for 3-6 h;
6) cooling and demolding: cooling to room temperature and demoulding to obtain a waste plastic plate;
7) surface coating: and coating a layer of PMMA slurry on the surface of the waste plastic plate, and curing to obtain the waste plastic plate coated with the PMMA film.
Preferably, the composite active solvent is a mixed solution of an organic solvent and a methacrylate monomer in a mass ratio of 1:1, wherein the methacrylate monomer is dissolved with a solvent in a mass ratio of 2: 3 mixed organic peroxy initiator and N, N tertiary amine organic compound.
Preferably, the total amount of the organic peroxy initiator and the N, N tertiary amine organic compound is 0.15-0.30% of the methacrylate monomer.
Preferably, the organic solvent is one or a mixture of two of acetone and absolute ethyl alcohol.
Preferably, the methacrylate monomer is one or more of methyl methacrylate, ethyl methacrylate and butyl methacrylate.
Preferably, the organic peroxy initiator is benzoyl peroxide.
Preferably, the N, N tertiary amine organic compound is one or more of N, N-dimethylaniline, N-dihydroxyethyl-p-toluidine or N, N-dihydroxypropyl-p-toluidine.
Preferably, the surface coating is to spread PMMA slurry on the surface of the waste plastic plate by scraping, put the waste plastic plate into a mould containing toughened glass, carry out cold pressing and shaping, solidify for 2 to 4 hours at the temperature of between 25 and 35 ℃, treat for 1 to 2 hours at the temperature of between 100 and 120 ℃, cool and demould to obtain the waste plastic plate coated with the PMMA film on the surface.
Preferably, the PMMA slurry is: adding 0.08-0.16% of N organic tertiary amine compound, 0.12-0.24% of N benzoyl peroxide, 2-4% of N oxidized polyethylene wax powder, 40-60% of N magnesium hydroxide and 2-5% of N reflective pigment into a mixture of methyl methacrylate and PMMA molding powder with the total mass of N; stirring to form highly dispersed high-viscosity slurry, placing at 40-50 deg.C, prepolymerizing for 10-20min, and cooling to obtain the final product;
wherein the mass ratio of the methyl methacrylate to the PMMA molding powder is 1: (0.1-0.4) in the above-mentioned ratio.
Preferably, the organic tertiary amine compound is one or more of N, N-dimethylaniline, N-dihydroxyethyl-p-toluidine or N, N-dihydroxypropyl-p-toluidine;
the reflective pigment is a mixture of titanium dioxide and one or more of infrared reflective inorganic pigment, infrared reflective inorganic pigment and infrared reflective inorganic pigment.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
compared with the prior art, the method has the advantages that the waste plastic plate is formed, the using amount of organic solvent is reduced, after surface film coating is carried out, the Shore hardness is larger than 88HD, cracking is avoided when 50cm impacts, the wear resistance (g/100r) is smaller than 0.11, the adhesive force is 0 grade, the glossiness is larger than 90 degrees, and the contact angle is larger than 80 degrees.
The method has the advantages of simple process for recycling waste plastics, low equipment investment, low energy consumption, low pollution, low toxicity, low cost and the like. The prepared plastic plate can be polished at will, can be comparable to the acrylic panel on the market at present, can be applied to replace high-grade places such as curtain wall plates, acrylic plates and the like, and has high added value.
Detailed Description
The present invention will be described in detail with reference to specific embodiments, which are illustrative of the invention and are not to be construed as limiting the invention.
The invention relates to a waste plastic recycling method, which comprises the following steps:
1) fragmentation treatment of waste plastics
Crushing the waste plastics into millimeter-sized particles by a plastic crusher;
2) presoaking swelling
Immersing the waste plastics in the composite active solvent for 1-3h to obtain blocky waste plastics swelling bodies in the composite active solvent; the composite active solvent is a mixed solution formed by mixing an organic solvent and a methacrylate monomer according to a mass ratio of 1:1, wherein the methacrylate monomer is dissolved with a solvent which is mixed according to a mass ratio of 2: 3 mixed organic peroxy initiator and N, N tertiary amine organic compound. The total amount of the organic peroxide initiator and the N, N tertiary amine organic compound is 0.15-0.30% of the methacrylate monomer.
Wherein the organic solvent is one or a mixture of two of acetone and absolute ethyl alcohol.
The methacrylate monomer is one or a mixture of methyl methacrylate, ethyl methacrylate and butyl methacrylate.
The organic peroxy initiator is benzoyl peroxide.
The N, N tertiary amine organic compound is one or more of N, N-dimethylaniline, N-dihydroxyethyl-p-toluidine or N, N-dihydroxypropyl-p-toluidine.
3) Free state complex active solvent removal
Separating the massive waste plastic swelling body immersed in the composite active solvent from the free composite active solvent in a vibration mode;
4) compression molding
Putting the waste plastic swelling body into toughened glass, performing compression molding, and tightening a clamp;
5) vacuum curing
Curing and shaping in an oven with a vacuum degree of 0.07-0.09Mpa at 30-40 deg.C for 2-4h, replacing the upper template with frame-shaped toughened glass, tightening the fixture, and curing and shaping in an oven with a vacuum degree of 0.07-0.09Mpa at 60-80 deg.C for 3-6 h;
6) cooling and demolding: cooling to room temperature and demoulding to obtain a waste plastic plate;
7) surface coating: and coating a layer of PMMA slurry on the surface of the waste plastic plate, and curing to obtain the waste plastic plate coated with the PMMA film. The surface coating is to scrape PMMA slurry on the surface of a waste plastic plate, place the waste plastic plate in a mould containing toughened glass, carry out cold pressing and shaping, solidify for 2 to 4 hours at the temperature of between 25 and 35 ℃, treat for 1 to 2 hours at the temperature of between 100 and 120 ℃, cool and demould to obtain the waste plastic plate coated with the PMMA film on the surface.
The PMMA paste is prepared by adding 0.08-0.16% of N organic tertiary amine compound, 0.12-0.24% of N benzoyl peroxide, 2-4% of N polyethylene wax oxide powder, 40-60% of N magnesium hydroxide and 2-5% of N reflective pigment into a mixture of methyl methacrylate and PMMA molding powder with the total mass of N; stirring to form highly dispersed high-viscosity slurry, placing at 40-50 deg.C, prepolymerizing for 10-20min, and cooling to obtain the final product;
wherein the mass ratio of the methyl methacrylate to the PMMA molding powder is 1: (0.1-0.4) in the above-mentioned ratio. The organic tertiary amine compound is one or more of N, N-dimethylaniline, N-dihydroxyethyl-p-toluidine or N, N-dihydroxypropyl-p-toluidine; the reflective pigment is a mixture of titanium dioxide and one or more of self-made infrared reflective inorganic pigment (ZL201510890065.2), self-made infrared reflective inorganic pigment (ZL201310256735.6) and self-made infrared reflective inorganic pigment (ZL 201010604669.3).
Specific examples are given below to further illustrate the present invention.
Example 1
1) And (3) fragmentation treatment of waste plastics: crushing the waste plastics into millimeter-sized particles by a plastic crusher;
2) immersing the waste plastics in the composite active solvent for 2 hours, wherein blocky waste plastics swelling bodies appear in the composite active solvent; wherein the composite active solvent is prepared from the following components in a mass ratio of 1:1, mixing acetone and methyl methacrylate, wherein the mass ratio of methyl methacrylate is 2: 3 mixed benzoyl peroxide and N, N-dimethylaniline. The total amount of the benzoyl peroxide and the N, N-dimethylaniline is 0.25 percent of the methyl methacrylate;
3) separating the massive waste plastic swelling body immersed in the composite active solvent from the free composite active solvent in a vibration mode;
4) putting the waste plastic swelling body into toughened glass, performing compression molding, and tightening a clamp;
5) curing and shaping for 3h in an oven at 30 ℃ and a vacuum degree of 0.08Mpa, replacing the upper template with frame-shaped toughened glass, tightening the clamp, and curing and shaping for 4h in an oven at 50 ℃ and a vacuum degree of 0.08 Mpa;
6) cooling to room temperature and demoulding to obtain a waste plastic plate;
7) and coating a layer of PMMA slurry on the surface of the waste plastic plate, and curing to obtain the waste plastic plate coated with the PMMA film. The surface coating is to scrape the PMMA paste on the surface of the waste plastic plate, put the waste plastic plate into a mould containing toughened glass, cold press and shape, solidify for 2 to 4 hours at 30 ℃, treat for 1 hour at 110 ℃, cool and demould to obtain the waste plastic plate coated with the PMMA film on the surface.
The PMMA paste is as follows: the mass ratio of methyl methacrylate to PMMA molding powder is 1: 0.4, N, 0.10% N, N-dimethylaniline, 0.20% N benzoyl peroxide, 3% N oxidized polyethylene wax powder, 50% N magnesium hydroxide and 4% N of a light-reflecting pigment were added to the mixture of methyl methacrylate and PMMA molding powder; stirring to form highly dispersed high-viscosity slurry, placing the slurry in a prepolymerization mode at 40 ℃ for 20min, and cooling to obtain the high-viscosity high-dispersion liquid.
Wherein the reflective pigment is a mixture of titanium dioxide and self-made infrared reflective inorganic pigment (ZL 201510890065.2).
Example 2
1) And (3) fragmentation treatment of waste plastics: crushing the waste plastics into millimeter-sized particles by a plastic crusher;
2) immersing the waste plastics in the composite active solvent for 1h to generate blocky waste plastics swelling bodies in the composite active solvent; wherein the composite active solvent is prepared from the following components in a mass ratio of 1:1, mixing a mixed solution of acetone and absolute ethyl alcohol with ethyl methacrylate, wherein the weight ratio of ethyl methacrylate to ethyl acrylate is 2: 3 mixed benzoyl peroxide and N, N-dihydroxyethyl p-toluidine. The total amount of the benzoyl peroxide and the N, N-dihydroxyethyl p-toluidine is 0.15 percent of the ethyl methacrylate;
3) separating the massive waste plastic swelling body immersed in the composite active solvent from the free composite active solvent in a vibration mode;
4) putting the waste plastic swelling body into toughened glass, performing compression molding, and tightening a clamp;
5) curing and shaping for 2h in an oven at 40 ℃ and a vacuum degree of 0.09Mpa, replacing the upper template with frame-shaped toughened glass, tightening the clamp, and curing and shaping for 3h in an oven at 60 ℃ and a vacuum degree of 0.09 Mpa;
6) cooling to room temperature and demoulding to obtain a waste plastic plate;
7) and coating a layer of PMMA slurry on the surface of the waste plastic plate, and curing to obtain the waste plastic plate coated with the PMMA film. The surface coating is to scrape the PMMA paste on the surface of the waste plastic plate, put the waste plastic plate into a mould containing toughened glass, cold press and shape, solidify for 2h at 25 ℃, treat for 1h at 120 ℃, cool and demould to obtain the waste plastic plate coated with the PMMA film on the surface.
The PMMA paste is prepared by mixing methyl methacrylate and PMMA molding powder according to the mass ratio of 1: 0.1, the total mass of which is N, 0.08 percent of N, N-dihydroxyethyl-p-toluidine, 0.24 percent of N benzoyl peroxide, 2 percent of N oxidized polyethylene wax powder, 60 percent of N magnesium hydroxide and 2 percent of N reflective pigment are added into the mixture of the methyl methacrylate and the PMMA molding powder; stirring to form highly dispersed high-viscosity slurry, placing the slurry at 50 ℃ for prepolymerization for 10min, and cooling to obtain the high-viscosity high-dispersion liquid;
wherein the reflective pigment is a mixture of titanium dioxide and self-made infrared reflective inorganic pigment (ZL 201310256735.6).
Example 3
1) And (3) fragmentation treatment of waste plastics: crushing the waste plastics into millimeter-sized particles by a plastic crusher;
2) immersing the waste plastics in the composite active solvent for 3 hours, wherein blocky waste plastics swelling bodies appear in the composite active solvent; wherein the composite active solvent is prepared from the following components in a mass ratio of 1:1, mixing absolute ethyl alcohol with ethyl methacrylate and butyl methacrylate, wherein the mass ratio of the ethyl methacrylate to the butyl methacrylate is 2: 3 a mixture of benzoyl peroxide and N-dihydroxypropyl p-toluidine in combination with N, N-dimethylaniline.
The total amount of the mixture of benzoyl peroxide, N-dihydroxypropyl-p-toluidine and N, N-dimethylaniline is 0.30 percent of the total amount of the mixture of ethyl methacrylate and butyl methacrylate;
3) separating the massive waste plastic swelling body immersed in the composite active solvent from the free composite active solvent in a vibration mode;
4) putting the waste plastic swelling body into toughened glass, performing compression molding, and tightening a clamp;
5) curing and shaping for 4h in an oven at 30 ℃ and a vacuum degree of 0.07Mpa, replacing the upper template with frame-shaped toughened glass, tightening the clamp, and curing and shaping for 6h in an oven at 80 ℃ and a vacuum degree of 0.07 Mpa;
6) cooling to room temperature and demoulding to obtain a waste plastic plate;
7) and coating a layer of PMMA slurry on the surface of the waste plastic plate, and curing to obtain the waste plastic plate coated with the PMMA film. The surface coating is to scrape the PMMA paste on the surface of the waste plastic plate, put the waste plastic plate into a mould containing toughened glass, cold press and shape, solidify for 4 hours at 35 ℃, treat for 2 hours at 100 ℃, cool and demould to obtain the waste plastic plate coated with the PMMA film on the surface.
The PMMA paste is prepared by mixing methyl methacrylate and PMMA molding powder according to the mass ratio of 1: 0.2, the total mass of which is N, and 0.16 percent of N, N-dihydroxyethyl p-toluidine, 0.12 percent of benzoyl peroxide, 4 percent of oxidized polyethylene wax powder, 40 percent of magnesium hydroxide and 5 percent of N reflective pigment are added into the mixture of the methyl methacrylate and the PMMA molding powder; stirring to form highly dispersed high-viscosity slurry, placing the slurry at 40 ℃ for prepolymerization for 20min, and cooling to obtain the high-viscosity high-dispersion liquid;
wherein the reflective pigment is a mixture of titanium dioxide, infrared reflective inorganic pigment (ZL201010604669.3) and self-made infrared reflective inorganic pigment (ZL 201310256735.6).
According to the invention, firstly, a waste plastic plate is subjected to swelling and compression molding, the use amount of an organic solvent is reduced, and then after surface coating, the Shore hardness is larger than 88HD, 50cm impact does not crack, the wear resistance (g/100r) is smaller than 0.11, the adhesive force is 0 grade, the glossiness is larger than 90 degrees, the contact angle is larger than 80 degrees, the waste plastic plate can be polished at will, and the waste plastic plate can be compared with the popular acrylic panel in the market at present, and has a high added value.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (2)
1. A method for recycling waste plastics, characterized by comprising the steps of:
1) fragmentation treatment of waste plastics
Crushing the waste plastics into millimeter-sized particles by a plastic crusher;
2) presoaking swelling
Immersing the waste plastics in the composite active solvent for 1-3h to obtain blocky waste plastics swelling bodies in the composite active solvent;
3) free state complex active solvent removal
Separating the massive waste plastic swelling body immersed in the composite active solvent from the free composite active solvent in a vibration mode;
4) compression molding
Putting the waste plastic swelling body into toughened glass, performing compression molding, and tightening a clamp;
5) vacuum curing
Curing and shaping in an oven with a vacuum degree of 0.07-0.09Mpa at 30-40 deg.C for 2-4h, replacing the upper template with frame-shaped toughened glass, tightening the fixture, and curing and shaping in an oven with a vacuum degree of 0.07-0.09Mpa at 60-80 deg.C for 3-6 h;
6) cooling and demolding: cooling to room temperature and demoulding to obtain a waste plastic plate;
7) surface coating: coating a layer of PMMA slurry on the surface of the waste plastic plate, and curing to obtain the waste plastic plate coated with the PMMA film;
the composite active solvent is a mixed solution formed by mixing an organic solvent and a methacrylate monomer according to a mass ratio of 1:1, wherein the methacrylate monomer is dissolved with a solvent which is mixed according to a mass ratio of 2: 3 mixed organic peroxy initiator and N, N tertiary amine organic compound;
the total amount of the organic peroxide initiator and the N, N tertiary amine organic compound is 0.15-0.30% of the methacrylate monomer;
the organic solvent is one or a mixture of two of acetone and absolute ethyl alcohol;
the methacrylate monomer is one or a mixture of methyl methacrylate, ethyl methacrylate and butyl methacrylate;
the organic peroxide initiator is benzoyl peroxide;
the N, N tertiary amine organic compound is one or more of N, N-dimethylaniline, N-dihydroxyethyl-p-toluidine or N, N-dihydroxypropyl-p-toluidine;
the PMMA paste is as follows: adding 0.08-0.16% of N organic tertiary amine compound, 0.12-0.24% of N benzoyl peroxide, 2-4% of N oxidized polyethylene wax powder, 40-60% of N magnesium hydroxide and 2-5% of N reflective pigment into a mixture of methyl methacrylate and PMMA molding powder with the total mass of N; stirring to form highly dispersed high-viscosity slurry, placing at 40-50 deg.C, prepolymerizing for 10-20min, and cooling to obtain the final product;
wherein the mass ratio of the methyl methacrylate to the PMMA molding powder is 1: (0.1-0.4) in the above-mentioned ratio.
2. The method for recycling waste plastics as claimed in claim 1, wherein the surface coating is carried out by coating PMMA slurry on the surface of the waste plastic plate by scraping, placing the waste plastic plate in a mould containing toughened glass, carrying out cold pressing and shaping, curing at 25-35 ℃ for 2-4h, treating at 100-120 ℃ for 1-2h, cooling and demoulding to obtain the waste plastic plate coated with the PMMA film on the surface.
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| CN201810990899.4A CN109176969B (en) | 2018-08-28 | 2018-08-28 | Waste plastic recovery method |
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| CN201810990899.4A CN109176969B (en) | 2018-08-28 | 2018-08-28 | Waste plastic recovery method |
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| CN109176969B true CN109176969B (en) | 2020-09-22 |
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| KR100528236B1 (en) * | 2003-07-29 | 2005-11-15 | 주식회사 엘지화학 | Artificial marble reutilizing waste materials and preparation thereof |
| JP5207391B2 (en) * | 2009-03-09 | 2013-06-12 | シャープ株式会社 | Manufacturing method of plastic member |
| CN102642265A (en) * | 2012-05-05 | 2012-08-22 | 林慈泰 | Product forming method by utilizing waste advertisement cloth |
| AR100196A1 (en) * | 2014-10-21 | 2016-09-21 | Enye Tech S A | METHOD FOR DEVELOPING AN INPUT FROM THE RECYCLING OF PLASTIC MATERIAL OF INDUSTRIAL WASTE AND POST CONSUMPTION, SUITABLE TO BE USED BY 3D PRINTERS |
| CN105237673B (en) * | 2015-10-19 | 2017-09-05 | 陕西理工学院 | The method of casting PMMA plates and spray polyplant under the conditions of a kind of polymerized at room temperature |
| CN105315595B (en) * | 2015-11-17 | 2017-09-05 | 陕西理工学院 | A kind of recovery method of waste plastics |
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