CN107840947B - Method for synthesizing unsaturated polyester by utilizing PET composite film waste - Google Patents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/52—Polycarboxylic acids or polyhydroxy compounds in which at least one of the two components contains aliphatic unsaturation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/78—Preparation processes
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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
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
- C08J11/22—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds
- C08J11/24—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic oxygen-containing compounds containing hydroxyl groups
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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
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- 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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Abstract
The invention discloses a method for synthesizing unsaturated polyester by utilizing PET composite membrane waste, which comprises the steps of adding an alcoholysis agent and a catalyst into a reaction kettle, heating, adding the PET composite membrane waste under the stirring condition for alcoholysis, cooling a mixture after alcoholysis until components of a functional membrane are solid, purifying an alcoholysate through multi-stage filtration, and synthesizing the unsaturated polyester by utilizing the alcoholysate. The invention does not need the previous separation treatment, can directly use the PET composite film waste, realizes the separation by the subsequent multi-stage solid-liquid separation, greatly reduces the use of chemicals in the separation and cleaning, and can realize the high-efficiency reutilization of the PET composite film waste.
Description
Technical Field
The invention relates to the field of utilization of PET waste materials, in particular to a method for synthesizing unsaturated polyester by utilizing PET composite film waste materials.
Background
PET has good physical and chemical properties and is widely used in the fields of food packaging, fibers, films, electrical insulating materials and the like, the PET industry is rapidly developed, the annual output is gradually increased, and the film use ratio is also gradually increased. In particular, in the photoelectric field of solar cells, liquid crystal displays, LED lighting, and the like, functional film members using a PET film as a substrate have become mainstream and are widely used, for example, a solar back sheet film, a diffusion film, an incremental film, a reflection film, and the like, and the functional film members are mostly formed by adhering a functional film layer on the surface of a PET film. With the vigorous development of related industries, more and more PET waste materials are discharged into the nature, which not only causes increasingly serious environmental protection problems, but also causes huge waste of petroleum resources. The recycling of PET not only can solve the problem of environmental protection, but also can be used as a new resource.
Currently, the recovery process of PET can be classified into physical and chemical processes. The physical method comprises the following steps: PET is separated, cleaned and dried to obtain a finished product, has the advantages of low treatment cost, high efficiency, single defect treatment material and reduced quality, and is mainly used for manufacturing fibers, sheets and non-edible packaging bottles. The chemical method is to depolymerize PET and reuse the PET, specifically hydrolysis, aminolysis, alcoholysis, pyrolysis and the like, and can achieve the recycling of resources at the molecular level. The depolymerization and reuse of PET waste disclosed and reported in the prior art is based on single and pure PET material after pretreatment such as waste separation, physical cleaning and the like, while for PET composite film waste, because a PET film and a functional film layer are bonded by an adhesive and the overall thickness is usually small (usually in the millimeter to micron level), the separation is very difficult, the PET film waste cannot be utilized by a simple physical method, and is difficult to be utilized by a conventional chemical method, so the recovery of the PET film waste is limited. Therefore, it is important to develop a chemical recycling process suitable for PET composite film waste.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for synthesizing unsaturated polyester by directly utilizing PET composite membrane waste for alcoholysis, separation and purification.
The technical scheme of the invention is as follows:
a method for synthesizing unsaturated polyester by utilizing PET composite film waste comprises the following steps:
1) crushing PET composite film waste materials to the diameter of below 50mm, wherein the PET composite film waste materials comprise a PET film and at least one functional film adhered to at least one surface of the PET film; the functional film is insoluble in and non-reactive with diethylene glycol;
2) adding 2500 parts by weight of 1500-containing silicon and 0.5-10 parts by weight of diglycol and 0.5-10 parts by weight of alcoholysis catalyst into a reaction kettle, heating to 70-90 ℃, adding 3000 parts by weight of 1800-containing silicon and crushed PET composite membrane waste under a continuous stirring state, heating to 200-containing silicon and 250 ℃, and reacting at constant temperature for 0.5-2 hours until PET is completely alcoholyzed;
3) cooling the mixture after alcoholysis until at least part of the components of the functional membrane are solid, filtering out impurities by a screw filter under the conditions of 3-5 kg of pressure and 50-100 meshes, then maintaining the temperature or further cooling until the residual components of the functional membrane are solid, and filtering by a plate filter under the conditions of 5-7 kg of pressure and 200 meshes to 400 meshes to obtain a purified alcoholysis product;
4) sending the purified alcoholysis product to another reaction kettle, cooling to 140-.
Optionally, the PET composite film waste further comprises a bonding layer, and the functional film is bonded with the PET film through the bonding layer.
Optionally, the functional film is at least one of a polyvinyl fluoride film, a polyvinylidene fluoride film and a cross-linked EVA film.
Optionally, the bonding layer is polyurethane glue, the polyurethane glue is degraded in the step 2), and the generated small molecular substances are led out through the condensation conduit.
Optionally, the bonding layer is saturated polyester glue or acrylic glue.
Optionally, the functional film is a functional coating formed by coating the surface of the PET film and curing.
Optionally, the functional film includes a solar back panel film, a diffusion film, a reflection film, and an antireflection film.
In the step 4), after the reaction is finished, cooling to 140-.
A method for synthesizing unsaturated polyester by utilizing solar backboard film waste materials comprises the following steps:
1) crushing the solar back panel film waste materials to be less than 12mm in diameter, wherein the solar back panel film waste materials comprise a PET (polyethylene terephthalate) film and functional films adhered to two opposite surfaces of the PET film; one functional film is a polyvinyl fluoride film or a fluorocarbon coating, and the other functional film is a cross-linked EVA film or a polyvinylidene fluoride film;
2) adding 2500 parts by weight of 1500-;
3) cooling the mixture after alcoholysis to 170-200-;
4) sending the purified alcoholysis product to another reaction kettle, cooling to 140-.
The invention has the beneficial effects that:
1. crushing PET composite membrane waste materials, directly carrying out alcoholysis, controlling the temperature of a mixture after alcoholysis until components of a functional membrane are solid, carrying out solid-liquid separation through multi-stage filtration, and carrying out polycondensation and dilution on alcoholysis products after separation and purification to synthesize unsaturated polyester, so that the problem of interference of impurities on the PET alcoholysis products is solved without carrying out the previous cleaning and separation procedures, and the maximum purification of products is realized; the separated solid components can be further recycled and utilized, so that the utilization rate is improved, and the significance of reutilization is achieved.
2. The method has the advantages that only the existing unsaturated polyester production equipment needs to be modified, the cost is low, the operation is simple, the large-scale production is easy, the use amount of chemicals in a PET composite film waste separation and cleaning system is greatly reduced, the method is more environment-friendly and safe, and great economic benefits and social benefits are realized.
3. Diethylene glycol is used as an alcoholysis agent, so that the boiling point is high, and the amount of miscible substances is small, thereby being beneficial to separation and purification; meanwhile, the compatibility of the resin and styrene after polycondensation is good, which is beneficial to the subsequent synthesis of unsaturated polyester.
Detailed Description
The present invention is further described below, but the scope of the present invention is not limited to the following.
Example one
Collecting solar backboard film waste, wherein the backboard film waste is formed by adhering a polyvinyl fluoride (PVF) film functional layer on the double surfaces of a PET film through a saturated polyester adhesive layer, and crushing the backboard film waste to a diameter of below 12 mm.
Adding 2000 parts of diethylene glycol and 1 part of zinc acetate into a 5000L reaction kettle, stirring and heating to 80 ℃, adding 2300 parts of crushed backboard membrane waste materials, stirring and heating, controlling the temperature to be between 235-240 ℃, reacting at constant temperature for 1.5-2 hours until the PET is completely alcoholyzed, wherein the alcoholysis of the saturated polyester adhesive occurs simultaneously in the process. Adjusting the temperature of the mixture after alcoholysis to 180 ℃ (PVF is solid at the moment), pumping the mixture to a screw type solid-liquid separator, filtering out solid substances under the conditions that the pressure is 5 kg and the mesh is 60 meshes, pumping the filtrate to a plate filter, further filtering to remove impurities under the conditions that the pressure is 7 kg and the mesh is 300 meshes, cooling the alcoholysate after purification to 140-. Then the temperature is reduced to 150 ℃, 0.1 part of hydroquinone and 0.3 part of paraffin are added, and the mixture is stirred for 0.5 hour under the condition of heat preservation. And continuously cooling to 110 ℃, introducing into a styrene dilution kettle, controlling the mixing temperature to be about 80 ℃, finally adding the copper naphthenate, uniformly stirring, detecting the performance to be qualified, filtering and discharging. The product can be used for winding pipes.
Example two
Collecting solar backboard film waste, wherein the backboard film waste is formed by adhering polyvinylidene fluoride (PVDF) film functional layers on two sides of a PET film through an acrylic adhesive bonding layer, and crushing the backboard film waste to a diameter of less than 12 mm.
Adding 2000 parts of diethylene glycol and 0.8 part of stannous chloride into a 5000L reaction kettle, stirring and heating to 80 ℃, adding 2600 parts of broken backboard film waste, stirring, heating, controlling the temperature to be between 215 and 220 ℃, reacting at constant temperature for 1.5-2 hours, and after PET is completely alcoholyzed, the polyurethane adhesive is degraded in the process, and the small molecular substance carbamate generated by degradation is led out through a condensation conduit and is recovered. Adjusting the temperature of the mixture after alcoholysis to 160 ℃ (at the moment, PVDF and acrylic acid glue are solid), pumping the mixture after alcoholysis to a screw filter, filtering out solid substances under the conditions that the pressure is 5 kg and the mesh is 60 meshes, pumping the filtrate to a plate filter, further filtering impurities under the conditions that the pressure is 7 kg and the mesh is 400 meshes, cooling the alcoholysis product after purification to 150 ℃, adding 5 parts of metered maleic anhydride and antioxidant (triphenyl phosphite), slowly heating to effluent and keeping the temperature for one hour, heating to 190-210 ℃, controlling the temperature of a reflux column below 105 ℃, carrying out esterification reaction for 1.5-2 hours, sampling and measuring the acid value (KOH) to 50mg/g, starting vacuum for 1 hour, and taking the reaction end point when the acid value is reduced to below 30 mg/g. Then the temperature is reduced to 150 ℃, 0.1 part of hydroquinone and 0.3 part of paraffin are added, and the mixture is stirred for 0.5 hour under the condition of heat preservation. And continuously cooling to 110 ℃, introducing into a styrene dilution kettle, controlling the mixing temperature to be about 80 ℃, finally adding the copper naphthenate, uniformly stirring, detecting the performance to be qualified, filtering and discharging. The product can be used for artificial stone.
EXAMPLE III
Collecting solar backboard film waste, wherein the backboard film waste is formed by adhering a polyvinyl fluoride (PVF) film functional layer on one surface of a PET film through a polyurethane adhesive bonding layer and adhering a cross-linked EVA film on the other surface of the PET film through the polyurethane adhesive bonding layer. And crushing the back plate membrane waste material to be less than 12mm in diameter.
Adding 2000 parts of diethylene glycol and 0.8 part of stannous chloride into a 5000L reaction kettle, stirring and heating to 80 ℃, adding 2600 parts of broken backboard film waste, stirring, heating, controlling the temperature to be between 215 and 220 ℃, reacting at constant temperature for 1.5-2 hours, and after PET is completely alcoholyzed, the polyurethane adhesive is degraded in the process, and the small molecular substance carbamate generated by degradation is led out through a condensation conduit and is recovered. And (3) adjusting the temperature of the mixture after alcoholysis to 180 ℃, pumping the mixture after alcoholysis to a screw filter, filtering out solid substances PVF under the conditions that the pressure is 4 kg and the mesh is 100 meshes, cooling the filtrate to 140 ℃, pumping to a plate filter, and further filtering the EVA under the conditions that the pressure is 7 kg and the mesh is 300 meshes. Adding 5 parts of metered maleic anhydride and antioxidant (triphenyl phosphite) into the purified alcoholysis product, slowly heating to water outlet, keeping the temperature for one hour, heating to 190 ℃ and 210 ℃, controlling the temperature of a reflux column below 105 ℃, carrying out esterification reaction for 1.5-2 hours, sampling, measuring the acid value (KOH) to reduce to 50mg/g, starting vacuum for 1 hour, and taking the reaction end point when the acid value is reduced to below 30 mg/g. Then the temperature is reduced to 150 ℃, 0.1 part of hydroquinone and 0.3 part of paraffin are added, and the mixture is stirred for 0.5 hour under the condition of heat preservation. And continuously cooling to 110 ℃, introducing into a styrene dilution kettle, controlling the mixing temperature to be about 80 ℃, finally adding the copper naphthenate, uniformly stirring, detecting the performance to be qualified, filtering and discharging. The product can be used for artificial stone.
Example four
Collecting solar backboard film waste, wherein the backboard film waste is formed by adhering a polyvinylidene fluoride (PVDF) film functional layer on one surface of a PET film through a polyurethane adhesive bonding layer and adhering a cross-linked EVA film on the other surface of the PET film through the polyurethane adhesive bonding layer. And crushing the back plate membrane waste material to be less than 12mm in diameter.
Adding 2000 parts of diethylene glycol and 0.8 part of stannous chloride into a 5000L reaction kettle, stirring and heating to 80 ℃, adding 2800 parts of broken back plate film waste, stirring, heating, controlling the temperature to be between 215 and 220 ℃, reacting at constant temperature for 1.5-2 hours, and when PET is completely alcoholyzed, the polyurethane adhesive is degraded in the process, and the small molecular substance carbamate generated by degradation is led out through a condensation conduit and is recovered. And (3) adjusting the temperature of the mixture after alcoholysis to 160 ℃, pumping the mixture after alcoholysis to a screw filter, filtering out solid PVDF under the conditions that the pressure is 5 kg and the meshes are 80 meshes, cooling the filtrate to 140 ℃, pumping to a plate filter, and further filtering EVA under the conditions that the pressure is 6 kg and the meshes are 300 meshes. Adding 5 parts of metered maleic anhydride and antioxidant (triphenyl phosphite) into the purified alcoholysis product, slowly heating to water outlet, keeping the temperature for one hour, heating to 190 ℃ and 210 ℃, controlling the temperature of a reflux column below 105 ℃, carrying out esterification reaction for 1.5-2 hours, sampling, measuring the acid value (KOH) to reduce to 50mg/g, starting vacuum for 1 hour, and taking the reaction end point when the acid value is reduced to below 30 mg/g. Then the temperature is reduced to 150 ℃, 0.1 part of hydroquinone and 0.3 part of paraffin are added, and the mixture is stirred for 0.5 hour under the condition of heat preservation. And continuously cooling to 110 ℃, introducing into a styrene dilution kettle, controlling the mixing temperature to be about 80 ℃, finally adding the copper naphthenate, uniformly stirring, detecting the performance to be qualified, filtering and discharging. The product can be used for artificial stone.
EXAMPLE five
Collecting solar backboard film waste, wherein the backboard film waste is a PET film double-sided coated fluorocarbon paint coating, and the backboard film waste is crushed to be less than 12mm in diameter.
Adding 2000 parts of diethylene glycol and 10 parts of zinc acetate into a 5000L reaction kettle, stirring and heating to 80 ℃, adding 2100 parts of broken backboard membrane waste, stirring and heating, controlling the temperature to be 200-210 ℃, reacting at constant temperature for 1.5-2 hours, and waiting for complete alcoholysis of PET. And (3) adjusting the temperature of the mixture after alcoholysis to 200 ℃ (the fluorocarbon coating is solid at the moment), pumping the mixture after alcoholysis to a screw filter, filtering out solid substances under the conditions that the pressure is 5 kg and the mesh is 60 meshes, pumping the filtrate to a plate filter, and further removing impurities under the conditions that the pressure is 7 kg and the mesh is 300 meshes. Adding 5 parts of metered maleic anhydride and antioxidant (triphenyl phosphite), slowly heating to water outlet, keeping the temperature for one hour, heating to 190-210 ℃, controlling the temperature of a reflux column below 105 ℃, carrying out esterification reaction for 1.5-2 hours, sampling, measuring the acid value (KOH) to reduce to 50mg/g, starting vacuum for 1 hour, and taking the reaction end point when the acid value is reduced to below 30 mg/g. Then the temperature is reduced to 150 ℃, 0.1 part of hydroquinone and 0.3 part of paraffin are added, and the mixture is stirred for 0.5 hour under the condition of heat preservation. And continuously cooling to 110 ℃, introducing into a styrene dilution kettle, controlling the mixing temperature to be about 80 ℃, finally adding the copper naphthenate, uniformly stirring, detecting the performance to be qualified, filtering and discharging. The product can be used for artificial stone.
EXAMPLE six
Collecting reflective film waste, wherein the reflective film waste is a reflective layer made of a PET film with a doped acrylic adhesive adhered on the surface, the reflective layer made of the doped acrylic adhesive has both adhesive property and reflective function, and the dopant is glass fiber. The back plate membrane waste is crushed to about 30mm in diameter.
Adding 2000 parts of diethylene glycol and 0.8 part of stannous chloride into a 5000L reaction kettle, stirring and heating to 80 ℃, adding 2600 parts of crushed reflective film waste, stirring and heating, controlling the temperature to be between 215 and 220 ℃, reacting for 1.5-2 hours at constant temperature, and waiting for complete alcoholysis of PET. Adjusting the temperature of the mixture after alcoholysis to 200 ℃, pumping the mixture after alcoholysis to a screw filter, filtering out solid substances under the conditions that the pressure is 5 kg and the mesh is 60 meshes, pumping the filtrate to a plate filter, further filtering impurities under the conditions that the pressure is 7 kg and the mesh is 400 meshes, cooling the alcoholysis product after purification to 140-150 ℃, adding 5 parts of metered maleic anhydride and antioxidant (triphenyl phosphite), slowly heating to water outlet, keeping the temperature for one hour, heating to 190-210 ℃, controlling the temperature of a reflux column below 105 ℃, carrying out esterification reaction for 1.5-2 hours, sampling, measuring the acid value (KOH) to 50mg/g, starting vacuum for 1 hour, and taking the reaction end point when the acid value is reduced to below 30 mg/g. Then the temperature is reduced to 150 ℃, 0.1 part of hydroquinone and 0.3 part of paraffin are added, and the mixture is stirred for 0.5 hour under the condition of heat preservation. And continuously cooling to 110 ℃, introducing into a styrene dilution kettle, controlling the mixing temperature to be about 80 ℃, finally adding the copper naphthenate, uniformly stirring, detecting the performance to be qualified, filtering and discharging. The product can be used for artificial stone.
In addition, those skilled in the art should understand that it is within the scope of the present invention to mix and crush different kinds of PET composite film waste, perform alcoholysis, and perform solid-liquid separation by gradually adjusting the temperature until different impurity components are solid.
The above examples are only intended to further illustrate the method of the present invention for synthesizing unsaturated polyester from PET composite film waste, but the present invention is not limited to the examples, and any simple modification, equivalent change and modification made to the above examples according to the technical spirit of the present invention fall within the scope of the technical solution of the present invention.
Claims (7)
1. A method for synthesizing unsaturated polyester by utilizing PET composite film waste is characterized by comprising the following steps:
1) crushing PET composite film waste materials to the diameter of below 50mm, wherein the PET composite film waste materials comprise a PET film and at least one functional film adhered to at least one surface of the PET film; the functional film is insoluble in and non-reactive with diethylene glycol; the PET composite film waste material also comprises a bonding layer, and the functional film is bonded with the PET film through the bonding layer; the functional film is at least one of a polyvinyl fluoride film, a polyvinylidene fluoride film and a cross-linked EVA film;
2) adding 2500 parts by weight of 1500-containing silicon and 0.5-10 parts by weight of diglycol and 0.5-10 parts by weight of alcoholysis catalyst into a reaction kettle, heating to 70-90 ℃, adding 3000 parts by weight of 1800-containing silicon and crushed PET composite membrane waste under a continuous stirring state, heating to 200-containing silicon and 250 ℃, and reacting at constant temperature for 0.5-2 hours until PET is completely alcoholyzed;
3) cooling the mixture after alcoholysis until at least part of the components of the functional membrane are solid, filtering out impurities by a screw filter under the conditions of 3-5 kg of pressure and 50-100 meshes, then maintaining the temperature or further cooling until the residual components of the functional membrane are solid, and filtering by a plate filter under the conditions of 5-7 kg of pressure and 200 meshes to 400 meshes to obtain a purified alcoholysis product;
4) sending the purified alcoholysis product to another reaction kettle, cooling to 140-.
2. The method for synthesizing unsaturated polyester by using waste PET composite film according to claim 1, wherein the method comprises the following steps: the bonding layer is polyurethane glue, the polyurethane glue is degraded in the step 2), and the generated small molecular substances are led out through the condensation conduit.
3. The method for synthesizing unsaturated polyester by using waste PET composite film according to claim 1, wherein the method comprises the following steps: the bonding layer is saturated polyester glue or acrylic acid glue.
4. The method for synthesizing unsaturated polyester by using waste PET composite film according to claim 1, wherein the method comprises the following steps: the functional film is a functional coating formed by coating the surface of the PET film and curing.
5. The method for synthesizing unsaturated polyester by using waste PET composite film according to claim 1, wherein the method comprises the following steps: the functional film comprises a solar backboard film, a diffusion film, a reflection film and an antireflection film.
6. The method for synthesizing unsaturated polyester by using waste PET composite film according to claim 1, wherein the method comprises the following steps: in the step 4), after the reaction is finished, cooling to 140-.
7. A method for synthesizing unsaturated polyester by utilizing solar backboard film waste materials is characterized by comprising the following steps:
1) crushing the solar back panel film waste materials to be less than 12mm in diameter, wherein the solar back panel film waste materials comprise a PET (polyethylene terephthalate) film and functional films adhered to two opposite surfaces of the PET film; one functional film is a polyvinyl fluoride film or a fluorocarbon coating, and the other functional film is a cross-linked EVA film or a polyvinylidene fluoride film;
2) adding 2500 parts by weight of 1500-;
3) cooling the mixture after alcoholysis to 170-200-;
4) sending the purified alcoholysis product to another reaction kettle, cooling to 140-.
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| CN110180597B (en) * | 2019-05-22 | 2022-04-12 | 漳州亚邦化学有限公司 | Composite catalyst for PET degradation and PET degradation method |
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| CN103554380A (en) * | 2013-11-08 | 2014-02-05 | 天津工业大学 | Process for preparing unsaturated polyester resin by mixed alcohol alcoholysis of RPET (recycled polyethylene terephtalate) plastic |
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