CN110724305B - Method and device for recycling composite PU foam leftover materials - Google Patents
Method and device for recycling composite PU foam leftover materials Download PDFInfo
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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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- 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
- C08J11/28—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 compounds containing nitrogen, sulfur or phosphorus
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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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
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
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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 and a device for recovering leftover materials of composite PU foam, which are characterized in that solid materials recovered by the recovery device and the method can be used for manufacturing reusable products with practical values and can be continuously produced; the recovery device mainly comprises a composite PU foam leftover material recovery continuous reaction kettle, a material cage for containing the composite PU foam leftover material, a special mould for pressing a product and the like; the recovery method has the characteristics of thorough alcoholysis reaction of PU foam, high recovery speed, uniform mixing of the recovered materials and the adhesive, uniform filling of the materials, capability of quickly manufacturing the recovered solids into products and the like.
Description
The technical field is as follows:
the invention relates to the technical field of recycling of composite PU foam leftover materials, in particular to a method and a device for recycling composite PU foam leftover materials.
Background art:
in the production process of composite PU products such as automobile interior ceilings, refrigeration house heat preservation, building external wall heat preservation and the like, a large amount of composite PU foam corner waste materials can be generated, and the problem of disposal of the waste materials is not well solved all the time.
The composite PU foam leftover bits and pieces have small density and large occupied area, and are difficult to naturally decompose under the conditions of normal temperature and normal pressure. The treatment methods commonly used at present are mainly a landfill treatment method and a physical pulverization treatment method. The waste is treated by adopting a landfill method, so that no value is generated and land resources are wasted; the difficulty of adopting the method of physical crushing and PU glue re-bonding is that PU foam in the composite PU foam is unevenly distributed and is difficult to bond into a product with uniform product structure and strength, large-scale industrial production is difficult, and the application of the method is limited.
In recent years, the problem of environmental protection is more and more emphasized, the country advocates a green circular economy production mode, the law enforcement of environmental protection is enhanced, and the relevant environmental protection regulations are more and more strict. The method for treating the composite PU foam leftover materials by adopting a landfill method or a physical method can not meet the development requirement of green recycling economy more and more, and the research on the method for recycling the composite PU foam leftover materials and manufacturing the recycled materials into recyclable products is paid further attention.
The invention content is as follows:
the invention aims to overcome the defects of the prior method, and provides a method for recycling composite PU foam leftover materials. The invention also aims to provide a device for recovering the leftover materials of the composite PU foam.
The technical scheme provided by the invention is as follows: the method for recycling the composite PU foam leftover materials is characterized by comprising the following process steps:
a, loading the sheared composite PU foam leftover material into a material cage, then reacting with an alcoholysis agent and a catalyst in a continuous reaction kettle consisting of a first reaction kettle, a second reaction kettle and a third reaction kettle in sequence, continuously supplementing the alcoholysis agent and the catalyst at the upper part of the third reaction kettle according to the reaction consumption condition, and overflowing the alcoholysis agent and the catalyst from the third reaction kettle into the second reaction kettle and the first reaction kettle in sequence, so that the composite PU foam leftover material in the material cage, the alcoholysis agents and the catalysts in the three reaction kettles form a countercurrent continuous reaction, reacting for 1h in each reaction kettle, and after the alcoholysis reaction of the third reaction kettle, finishing the reaction of all PU components contained in the composite PU foam leftover material and carrying out alcoholysis on PU foam to form liquid; standing the composite leftover solid and the adhered polyol liquid subjected to the alcoholysis of the PU foam for 1 hour above a recovery hopper close to a third reaction kettle, draining the adhered liquid of the solid until no liquid drops, and taking out the solid from a stainless steel cage; controlled polyol liquid flows back to the third reaction kettle;
b, taking out solid matters which cannot be subjected to alcoholysis by using the composite PU foam leftover materials from the material cage, and separating the recovered solid materials from the liquid polyol in the reaction kettle;
c, taking the recycled materials out of the stainless steel material cage, conveying the recycled materials into a kneading mixer through a material conveyor, adding the prepared PU adhesive, and fully and uniformly mixing the recycled materials and the PU adhesive in a kneading machine; the recovered material mixed with the PU adhesive is conveyed into a special die of a press by a material feeding machine, is strickled by a strickle in the die and then is matched, is pressed at a certain temperature, and is pressed into a required product by heat preservation and pressurization.
Furthermore, the size of the sheared composite PU foam leftover material is not less than 15mm and not more than 30 mm.
Further, the alcoholysis agent is a mixed solution of ethylene glycol and diethylene glycol, and the weight ratio of the two is 25-40%: 75-60 percent.
Further, the catalyst is prepared from T-9 and triethylene diamine according to the weight ratio of 1: 1, preparing in a weight ratio; the addition amount of the catalyst is 0.1-0.12% of the total mass of the recovered polyol.
Further, the temperature of the feed liquid in the three reaction kettles is 170-180 ℃.
Furthermore, in the pressing process, the temperature of the die is 65-75 ℃, and the pressing time is 2 minutes.
The recovery device of the recovery method of the composite PU foam leftover material is characterized by comprising a material cage, a continuous reaction kettle, a material conveyor, a kneading mixer, a material feeding machine, a mold and a strickler; the material cage is conveyed into the continuous reaction kettle through a slideway, after the reaction is finished, the recovered material is transferred to a material conveyor, is conveyed to a kneading mixer by the material conveyor, is conveyed to a mold by a material feeding machine, is strickled by a material strickler, and is matched with the mold to be pressurized to press the required product; the continuous reaction kettle consists of three reaction kettles which are connected together, the first reaction kettle, the second reaction kettle and the third reaction kettle are sequentially arranged from low to high, the upper part of each reaction kettle is provided with a heat conduction oil outlet, and the bottom of each reaction kettle is provided with a heat conduction oil inlet; the upper part of the third reaction kettle is connected with an alcoholysis agent and catalyst feed inlet, and the bottom of each reaction kettle is provided with a discharge outlet; the material cage is filled with the composite PU foam leftover materials and moves in the continuous reaction kettles, the material cage can move up and down in each reaction kettle, the contact reaction of PU foam and an alcoholysis agent is facilitated, the side surfaces and the upper and lower bottom surfaces of the material cage are net-shaped, and the mesh phi =10 mm; the side surface and the bottom surface of the material cage are of openable structures; the die consists of an upper die and a lower die.
The invention has the beneficial effects that: 1. the leftover materials of the composite PU foam can be quickly and completely recycled, wherein the PU foam is partially and completely converted into liquid polyol to be fully utilized and participate in the subsequent PU adhesive reaction; the residual solid part of the composite leftover material and the adhered polyol are mixed with PU glue for reaction and then are pressed into a solid product with a required shape and a certain strength in a mould at a certain temperature so as to achieve the aim of recycling; 2. the adopted reaction kettles are connected together, and the composite PU foam leftover materials sequentially move from the reaction kettle containing the recovered polyol with high concentration to the reaction kettle containing the recovered polyol with low concentration, so that under the conditions of the same temperature, the same time and the same addition of the alcoholysis agent and the catalyst, the reaction efficiency is higher, the reaction is more thorough, and the recovery effect is better; 3. the stainless steel cage has side surfaces, upper and lower bottom surfaces which are all processed into a mesh shape, so that the contact and reaction between the composite PU foam leftover materials in the cage and the recycled polyols are facilitated, the side surfaces and the bottom surface of the cage are designed into openable structures, and the filling of the composite PU foam leftover materials before the reaction and the taking out of the recycled materials after the reaction of the PU foam are facilitated.
Description of the drawings:
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of the cage being raised from the continuous reaction vessel;
FIG. 3 is a schematic view of the charging cage entering the continuous reaction vessel;
FIG. 4 is a schematic view of a special mold for manufacturing the composite PU pallet leg using recycled materials;
FIG. 5 is a schematic view of a composite PU pallet leg made by the mold of FIG. 4;
fig. 6 is a schematic view of a tray manufactured by the leg and the composite PU plate manufactured in fig. 5.
In the figure, 1 continuous reaction kettle, 1-1 first reaction kettle, 1-2 second reaction kettle, 1-3 third reaction kettle, 2 material cage, 2-1 material cage for containing composite PU foam leftover material, 2-2 material cage after the first reaction kettle finishes reaction, 2-3 material cage after the second reaction kettle finishes reaction, 2-4 material cage after the third reaction kettle finishes reaction, 2-5 material cage for controlling dry polyhydric alcohol, 3 mould, 3-1 fixing bolt, 3-2 upper mould insert block, 3-3 fastening bolt hole, 3-4 part taking bolt, 3-5 recovered solid material, 4 recovered hopper, 5 continuous reaction kettle top cover, 6 electric block, 7 composite PU pallet supporting leg, 8 composite PU pallet, 8-1 pallet upper layer transverse lath, 8-2 pallet upper layer longitudinal lath, 8-3 pallet lower layer transverse lath, 8-4 tray lower layer vertical lath.
The specific implementation mode is as follows:
for a better understanding and appreciation of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings; the examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention.
As shown in fig. 2, 3 and 4, the recovery device for the composite PU foam leftover materials comprises a material cage 2, a continuous reaction kettle 1, a material conveyor, a kneading mixer, a material feeding machine, a mold 3 and a strickle; the continuous reaction kettle 1 consists of three reaction kettles which are connected together, a first reaction kettle 1-1, a second reaction kettle 1-2 and a third reaction kettle 1-3 are sequentially arranged from low to high, the upper part of each reaction kettle is provided with a heat conduction oil outlet, and the bottom of each reaction kettle is provided with a heat conduction oil inlet; the upper parts of the third reaction kettles 1-3 are connected with an alcoholysis agent and catalyst feed inlet, and the bottom of each reaction kettle is provided with a discharge port; a recovery hopper 4 is arranged on one side of the third reaction kettle 1-3, a continuous reaction kettle top cover 5 is arranged above the continuous reaction kettle 1, the continuous reaction kettle top cover 5 is in a herringbone shape, a condensation reflux device is arranged on the continuous reaction kettle top cover 5, and nitrogen is continuously filled into the upper part of the reaction kettle to keep the polyhydric alcohol and the air in an isolated state;
the material cage 2 is a stainless steel material cage which can move in the continuous reaction kettle 1 and is used for containing the composite PU foam leftover material; the material cage 2-1 for containing the composite PU foam leftover materials can move up and down under the driving of an electric hoist 6 in each reaction kettle, contact reaction of PU foam and an alcoholysis agent is facilitated, the material cage 2-2 after the reaction of the first reaction kettle is finished after the reaction of the first reaction kettle 1-1, the material cage 2-3 after the reaction of the second reaction kettle is finished after the reaction of the second reaction kettle 1-2, the material cage 2-4 after the reaction of the third reaction kettle is finished after the reaction of the third reaction kettle 1-3, the material cage 2-4 after the reaction of the third reaction kettle is finished is moved out of the third reaction kettle 1-3 and is placed above a recovery hopper 4 to control the adhesion of the polyhydric alcohols, and the material cage 2-5 for controlling the drying of the polyhydric alcohols is finished after the control of the drying; the side surface and the upper and lower bottom surfaces of the material cage 2 are net-shaped, the mesh diameter phi =10mm, and the side surface and the bottom surface of the material cage 2 are openable structures; the die 3 consists of an upper die and a lower die, and the upper die and the lower die are of structures which are easy to process and take according to different product designs; the material conveyor, the kneading mixer, the material feeder and the strickle are the prior art;
the material cage 2 is conveyed into the continuous reaction kettle 1 through a slideway, then the recovered materials are transferred onto a material conveyor, the materials are conveyed into a kneading mixer by the material conveyor, then the materials are conveyed into a mould 3 by a material feeding machine, a material strickle is adopted for strickling, then the mould is closed and pressurized, and the required products are pressed.
A method for recovering leftover materials of composite PU foam comprises the following steps as shown in figure 1:
firstly, cutting the composite PU foam leftover materials to small pieces with the diameter of more than or equal to 15mm and less than or equal to 30mm, placing the small pieces into a stainless steel material cage, then sequentially reacting the small pieces with an alcoholysis agent and a catalyst in a continuous reaction kettle consisting of a first reaction kettle, a second reaction kettle and a third reaction kettle, continuously supplementing the alcoholysis agent and the catalyst at the upper part of the third reaction kettle according to the reaction consumption condition, wherein the alcoholysis agent is a mixed solution of ethylene glycol and diethylene glycol, and the weight ratio of the alcoholysis agent to the diethylene glycol is 25-40%: 75-60%, and the catalyst is prepared from T-9 and triethylene diamine according to the weight ratio of 1: 1, the catalyst is added in an amount of 0.1-0.12 percent of the total mass of the recovered polyol; the alcoholysis agent and the catalyst sequentially overflow into the second reaction kettle and the first reaction kettle from the third reaction kettle, so that the composite PU foam leftover materials in the material cage, the alcoholysis agents and the catalysts in the three reaction kettles form a countercurrent continuous reaction, the reaction is carried out in each reaction kettle for 1h, after the alcoholysis reaction of the third reaction kettle, all PU components contained in the composite PU foam leftover materials are reacted, the PU foam is subjected to alcoholysis to form liquid, and the temperature in the three reaction kettles is 170-180 ℃; standing the composite leftover solid and the adhered polyol liquid subjected to the alcoholysis of the PU foam for 1 hour above a recovery hopper close to a third reaction kettle, draining the solid adhered liquid until no liquid drops, and taking out the recovered material from a stainless steel cage; controlled polyol liquid flows back to the third reaction kettle;
secondly, separating the liquid from the solid which cannot be subjected to alcoholysis by using the composite PU foam leftover material, wherein the separated solid is a recycled material, and conveying the recycled material into a kneader by using a material conveyor;
thirdly, the recycled materials and the PU adhesive are fully mixed in a kneading machine for 2 minutes; and conveying the recovered material fully mixed with the PU adhesive into a special die for a press by a material feeding machine, leveling the recovered material in the die by a leveling device, closing the die, pressing into a required product shape at a certain temperature, wherein the die temperature is 65-75 ℃, the pressing time is 2 minutes, and opening the die after curing to take out the product.
Taking the fabrication of a reusable tray leg as an example, as shown in fig. 4 and 5; FIG. 4 shows a special mold 3 for a supporting leg of a tray, which comprises an upper mold and a lower mold, wherein the upper mold and the lower mold are fixed by a fixing bolt 3-1; the lower die is in a concave-convex shape consistent with the supporting legs, the concave shape is filled with 3-5 recovered solid materials, and each surface of the concave shape is provided with a 1-degree workpiece taking slope; the manufactured composite PU pallet supporting leg 7 is pulled out from the lower die by a taking part through a taking part bolt 3-4 arranged in the middle part of the upper die; then, rotating the PU tray supporting legs 7, and unloading the processed PU tray supporting legs 7 from the upper die; the convex part in the middle of the upper die is a rotatable upper die insert 3-2, the upper die insert 3-2 is propped by the step at the upper part of the part taking bolt 3-4 and can rotate, the processed PU tray supporting leg 7 and the upper die insert 3-2 rotate together, the PU tray supporting leg 7 rotates and is dismounted along with the part taking bolt 3-4, and the upper die insert 3-2 rotates along with the dismounted part taking bolt 3-4 to achieve the purpose of separating from the composite PU tray supporting leg 7; the part taking bolt 3-4 is provided with a fastening bolt hole 3-3, the part taking bolt 3-4 is rotatably fastened on the upper die through the fastening bolt hole 3-3 by a hole tool, and after the part taking bolt 3-4 is fastened, the hole on the part taking bolt 3-4 is blocked by a plug so as to facilitate the rotary part taking of the composite PU tray supporting leg 7.
Taking the fabrication of the composite PU pallet as an example, as shown in fig. 6:
example 1, the solid material recovered from the composite PU foam leftover bits and pieces and PU foaming glue are stirred and mixed evenly and then sent to a mould for pressurization and heat preservation foaming, and the density is controlled between 0.25 Kg/dm and 0.45Kg/dm3Cooling and taking out; the composite PU material landing leg in the density range is suitable for manufacturing light composite PUTray 8, this compound PU tray 8 dynamic bearing scope does: tray/only < 1.0 t; the composite PU pallet 8 consists of an upper pallet layer transverse lath 8-1, an upper pallet layer longitudinal lath 8-2, a lower pallet layer transverse lath 8-3, a lower pallet layer longitudinal lath 8-4 and supporting legs 7.
Example 2, the solid material recovered from the composite PU foam leftover bits and pieces and PU foaming glue are stirred and mixed evenly and then sent to a mould for pressurization and heat preservation foaming, and the density is controlled between 0.45Kg/dm and 0.65Kg/dm3Cooling and taking out; the composite PU material supporting leg in the density range is suitable for manufacturing a medium-sized composite PU tray 8, and the dynamic bearing range of the medium-sized composite PU tray 8 is as follows: 1.0t is less than or equal to the tray/1.5 t is less than or equal to the tray; the composite PU pallet 8 consists of an upper pallet layer transverse lath 8-1, an upper pallet layer longitudinal lath 8-2, a lower pallet layer transverse lath 8-3, a lower pallet layer longitudinal lath 8-4 and supporting legs 7.
Example 3 mixing the solid material recovered from the composite PU foam leftover with PU foaming glue, and then feeding the mixture into a mold for pressurization, heat preservation and foaming, wherein the density is controlled to be 0.65-0.85Kg/dm3Cooling and taking out; the composite PU material landing leg in the density range is suitable for manufacturing a heavy composite PU tray 8, and the dynamic bearing range of the heavy composite PU tray 8 is as follows: 1.5t < tray/2 t; the composite PU pallet 8 consists of an upper pallet layer transverse lath 8-1, an upper pallet layer longitudinal lath 8-2, a lower pallet layer transverse lath 8-3, a lower pallet layer longitudinal lath 8-4 and supporting legs 7.
The composite PU tray supporting leg manufactured by the method solves the problem of utilization of composite PU foam corner waste materials such as automobile roofs and the like, has good strength, can be used for replacing a logistics tray supporting leg manufactured by a new composite PU material, reduces the use of urea-formaldehyde glue due to the adoption of PU foaming glue, reduces the pollution of substances such as formaldehyde and the like to the environment, belongs to the recycling of waste corner materials, can replace a plastic tray to reduce the consumption of fossil raw materials, replaces a wood tray to reduce the consumption of wood, and has important significance in the aspect of environmental protection.
It should be understood that technical features not described in detail in the specification belong to the prior art. The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.
Claims (6)
1. A method for recovering leftover materials of composite PU foam is characterized by comprising the following process steps:
a, loading cut composite PU foam leftover materials into a material cage, then sequentially reacting with an alcoholysis agent and a catalyst in a continuous reaction kettle consisting of a first reaction kettle, a second reaction kettle and a third reaction kettle, continuously supplementing the alcoholysis agent and the catalyst at the upper part of the third reaction kettle according to the reaction consumption condition, and overflowing the alcoholysis agent and the catalyst from the third reaction kettle into the second reaction kettle and the first reaction kettle in sequence, so that the composite PU foam leftover materials in the material cage, the alcoholysis agents and the catalysts in the three reaction kettles form a countercurrent continuous reaction, reacting for 1h in each reaction kettle, and after the alcoholysis reaction of the third reaction kettle, finishing the reaction of PU components contained in the composite PU foam leftover materials and carrying out alcoholysis on PU foam to obtain liquid; standing the composite leftover solid and the adhered polyol liquid subjected to the alcoholysis of the PU foam for 1 hour above a recovery hopper close to a third reaction kettle, draining the adhered liquid of the solid until no liquid drops, and taking out the solid from a stainless steel cage; controlled polyol liquid flows back to the third reaction kettle;
b, taking out solid matters which cannot be subjected to alcoholysis by using the composite PU foam leftover materials from the material cage, and separating the recovered solid materials from the liquid polyol in the reaction kettle;
c, taking the recycled materials out of the stainless steel material cage, conveying the recycled materials into a kneading mixer through a material conveyor, adding the prepared PU adhesive, and fully and uniformly mixing the recycled materials and the PU adhesive in a kneading machine; conveying the recovered material mixed with the PU adhesive into a press die through a material feeding machine, leveling the recovered material in the die by using a leveling device, closing the die, pressing at a certain temperature, and pressing to obtain a required product through heat preservation and pressurization;
the recovery device adopted by the recovery method of the composite PU foam leftover materials comprises a material cage (2), a continuous reaction kettle (1), a material conveyor, a kneading mixer, a material feeding machine, a mold (3) and a strickle; the material cage (2) is conveyed into the continuous reaction kettle (1) through a slideway, after the reaction is finished, the recovered material is transferred to a material conveyor, is conveyed into a kneading mixer by the material conveyor, is conveyed into a mould (3) by a material feeding machine, is stricken by a material strickler, is closed and pressurized by the mould, and is pressed into a required product; the continuous reaction kettle (1) consists of three reaction kettles which are connected together, the first reaction kettle, the second reaction kettle and the third reaction kettle are sequentially arranged from low to high, the upper part of each reaction kettle is provided with a heat conduction oil outlet, and the bottom of each reaction kettle is provided with a heat conduction oil inlet; the upper part of the third reaction kettle is connected with an alcoholysis agent and catalyst feed inlet, and the bottom of each reaction kettle is provided with a discharge outlet; the material cage (2) is filled with composite PU foam leftover materials and moves in the continuous reaction kettles (1), the material cage (2) can move up and down in each reaction kettle, contact reaction between PU foam and an alcoholysis agent is facilitated, the side surfaces and the upper and lower bottom surfaces of the material cage (2) are net-shaped, and the mesh phi =10 mm; the side surface and the bottom surface of the material cage (2) are of openable structures; the die (3) consists of an upper die and a lower die.
2. The recycling method of PU foam scraps of claim 1, wherein the size of the cut PU foam scraps is 15 mm-30 mm.
3. The method for recycling the composite PU foam leftover material of claim 1, wherein the alcoholysis agent is a mixture of ethylene glycol and diethylene glycol, and the weight ratio of the alcoholysis agent to the diethylene glycol is 25-40%: 75-60 percent.
4. The method for recycling the composite PU foam leftover material according to claim 1, wherein the catalyst is prepared from T-9 and triethylene diamine according to the weight ratio of 1: 1, preparing in a weight ratio; the addition amount of the catalyst is 0.1-0.12% of the total mass of the recovered polyol.
5. The method for recycling the composite PU foam leftover material according to claim 1, wherein the temperature of the feed liquid in the three reaction kettles is 170-180 ℃.
6. The recycling method of PU foam leftover material of claim 1, wherein in the pressing process, the mold temperature is 65-75 ℃ and the pressing time is 2 minutes.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5714523A (en) * | 1996-01-25 | 1998-02-03 | Imperial Chemical Industries Plc | Process for hydrolysing polyurethane degradation products |
| CN105418878A (en) * | 2015-12-21 | 2016-03-23 | 浙江华江科技股份有限公司 | High-density and high-toughness polyurethane foam produced by using regenerated polyether polyol as raw material and preparation method therefor |
| CN106279760A (en) * | 2016-08-12 | 2017-01-04 | 成都威迪斯达科技有限公司 | A kind of recovery processing technique of waste polyurethane |
| CN109320764A (en) * | 2018-09-14 | 2019-02-12 | 烟台正海合泰科技股份有限公司 | It is a kind of to industrialize pure PU foam alcoholysis recovery method and Special back receipts feeding device |
-
2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5714523A (en) * | 1996-01-25 | 1998-02-03 | Imperial Chemical Industries Plc | Process for hydrolysing polyurethane degradation products |
| CN105418878A (en) * | 2015-12-21 | 2016-03-23 | 浙江华江科技股份有限公司 | High-density and high-toughness polyurethane foam produced by using regenerated polyether polyol as raw material and preparation method therefor |
| CN106279760A (en) * | 2016-08-12 | 2017-01-04 | 成都威迪斯达科技有限公司 | A kind of recovery processing technique of waste polyurethane |
| CN109320764A (en) * | 2018-09-14 | 2019-02-12 | 烟台正海合泰科技股份有限公司 | It is a kind of to industrialize pure PU foam alcoholysis recovery method and Special back receipts feeding device |
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