CN116922618A - Recycling system and recycling method for hard polyurethane leftovers - Google Patents
Recycling system and recycling method for hard polyurethane leftovers Download PDFInfo
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- CN116922618A CN116922618A CN202310819437.7A CN202310819437A CN116922618A CN 116922618 A CN116922618 A CN 116922618A CN 202310819437 A CN202310819437 A CN 202310819437A CN 116922618 A CN116922618 A CN 116922618A
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- polyurethane
- recycling
- recycling method
- powder
- hard
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 113
- 239000004814 polyurethane Substances 0.000 title claims abstract description 113
- 238000004064 recycling Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 27
- 235000021190 leftovers Nutrition 0.000 title claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 40
- 239000002245 particle Substances 0.000 claims abstract description 21
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 12
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 12
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 12
- 239000012948 isocyanate Substances 0.000 claims abstract description 12
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 12
- 229920000570 polyether Polymers 0.000 claims abstract description 12
- 239000000314 lubricant Substances 0.000 claims abstract description 11
- 238000000498 ball milling Methods 0.000 claims abstract description 10
- 238000009413 insulation Methods 0.000 claims abstract description 9
- 238000004321 preservation Methods 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 238000003860 storage Methods 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 description 19
- 238000000227 grinding Methods 0.000 description 8
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 229920005862 polyol Polymers 0.000 description 5
- 150000003077 polyols Chemical class 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000006260 foam Substances 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000006136 alcoholysis reaction Methods 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000005915 ammonolysis reaction Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 125000001951 carbamoylamino group Chemical group C(N)(=O)N* 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Chemical group CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920005906 polyester polyol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004804 winding Methods 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
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
-
- 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)
- Food Science & Technology (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention discloses a recycling system and a recycling method for hard polyurethane leftovers, which are characterized in that the polyurethane leftovers are crushed after impurity removal, a lubricant and an antioxidant are added into crushed polyurethane particles, and ball milling is performed until the particle size of polyurethane powder is 30-50 mu m; pneumatic conveying is carried out on the polyurethane powder after ball milling, and the polyurethane powder is conveyed into a polyurethane accommodating cavity through a polyurethane heat preservation pipe pouring hole; polyether and isocyanate are injected into the accommodating cavity in proportion, and the polyurethane heat insulation layer is formed.
Description
Technical Field
The invention belongs to the technical field of recycling of polyurethane offcuts, and particularly relates to a recycling system and a recycling method of hard polyurethane offcuts.
Background
The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The hard polyurethane leftovers stripped from the end heads in the production of the spray-coated winding heat-insulating pipes are generally treated in a landfill or incineration mode, so that polyurethane resources are wasted and the environment is polluted. The polyurethane recovery techniques currently developed are as follows: the polyurethane is crushed, added with various additives, polyether polyol and isocyanate in corresponding proportions, added into an extruder for melt extrusion to obtain polyurethane particles, and finally injection molded or compression molded to prepare the foaming product. The difficulty is that the polyurethane is mixed with the additive after being crushed, the requirements on the types and the adding proportion of the additive are high, and the control is difficult. The second is to degrade the polyurethane resin into components of low relative molecular mass by an alcoholysis method, an ammonolysis method, or the like. The principle is that a large amount of urethane bonds, ester bonds, ureido groups, ether bonds and the like contained in polyurethane macromolecules are broken to form a liquid mixture which contains polyester or polyether polyol or polyurethane polyol and a small amount of amine and has smaller relative molecular mass, then the liquid mixture is separated and is mixed into pure polyester polyol and isocyanate components according to the proportion of less than 20 percent to prepare polyurethane resin. The third is to blend 10-30% of crushed waste polyurethane into polyether polyol (A component) and isocyanate (B component) to foam and prepare foam products, which has the difficulties that the crushed polyurethane material is sieved by a 100-150 mesh sieve, the particle size requirement on the crushed polyurethane material is high, and the crushing difficulty is high.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a recycling system and a recycling method for hard polyurethane leftovers.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the invention provides a recycling system of hard polyurethane scraps, which comprises a cutterhead crusher, wherein an outlet at the lower end of the cutterhead crusher is communicated with one end of a spiral reamer, the other end of the spiral reamer is connected with an inlet of an overflow ball mill, an outlet of the overflow ball mill is connected with an inlet of a storage bin, the outlet of the storage bin is connected with one end of a conveying pipeline through a fan, and the other end of the conveying pipeline is connected with a pouring hole of a polyurethane heat-insulation pipe and is sealed;
the conveying pipeline gradually reduces in diameter from the inlet end to the outlet end. So as to ensure stronger conveying pressure and ensure that polyurethane leftover powder is sprayed into the pipe diameter to be dispersed greatly. The ratio of the inner diameter of the outlet end of the conveying pipeline to the inner diameter of the inlet end is 1:3, the outlet end of the conveying pipeline refers to one end connected with the pouring hole of the polyurethane heat-insulating pipe, and the inlet end refers to one end connected with the fan at the outlet of the storage bin.
In some embodiments, a flow regulating valve and a pressure sensor are additionally arranged at the inlet end of the conveying pipeline.
In some embodiments, the storage bin is a tapered storage bin.
In some embodiments, the flooded ball mill is connected to a source of lubricant and a source of antioxidant, respectively.
The lubricant is added in the ball milling process to reduce the moving resistance of the material in the ball mill during ball milling, reduce the shearing friction heating of the material and prevent overheat discoloration degradation. The purpose of adding the antioxidant is to prevent polyurethane return materials from being heated during processing, and the polyurethane return materials are oxidized and degraded at high temperature, so that the color of the polyurethane return materials is darkened.
In a second aspect, the invention provides a recycling method of hard polyurethane scraps, comprising the following steps:
removing impurities from polyurethane scraps, crushing, adding a lubricant and an antioxidant into crushed polyurethane particles, and performing ball milling until the particle size of polyurethane powder is 30-50 mu m;
pneumatic conveying is carried out on the polyurethane powder after ball milling, and the polyurethane powder is conveyed into a polyurethane accommodating cavity through a polyurethane heat preservation pipe pouring hole;
polyether and isocyanate are injected into the accommodating cavity in proportion, and the polyurethane heat insulation layer is formed.
The polyurethane powder is conveyed to all positions of the accommodating cavity according to the injection pressure of polyether and isocyanate and distributed along with the injection raw materials.
The polyurethane powder is input to the polyurethane powder, so that the quantity of the polyether polyol and the isocyanate is reduced, the polyurethane generated by the polymerization reaction contains a certain ratio of cells, the polyurethane powder with corresponding grain size is gradually filled or densely gathered in the cells formed by the polymerization reaction, a certain amount of polyurethane solid fine materials are added into the heat-insulating layer, and the polyurethane powder can be gathered together with polyurethane recovered in a powder state, so that the strength of the recovered polyurethane heat-insulating layer is not reduced, the heat-insulating effect and strength of the polyurethane are changed by changing the corresponding cell rate, and the hardness adjustment of the recovered polyurethane material is further facilitated.
In addition, the polyurethane recovery only has physical particle size change, does not need to add any antioxidant, foaming agent, modified rubber and the like, solves the problems of complex reagent addition and proportion preparation, and does not need to change heating and reshaping processes. When recycling polyurethane is realized, the density of the product can be regulated and controlled through the particle fineness, which is beneficial to expanding the application range of the recycled polyurethane and improving the utilization value.
In addition, the lubricant is added to reduce the moving resistance in the equipment during ball milling of the materials, reduce the shearing friction heating of the materials and prevent overheat discoloration degradation; the purpose of adding the antioxidant is to prevent the polyurethane return material from being heated during processing, and the polyurethane return material is oxidatively degraded at high temperature and has a darkened color, and can be hindered phenols or phosphites.
In some embodiments, the polyurethane powder comprises 3-8% by mass of the polyurethane insulation, such as may be 5%.
In some embodiments, the lubricant comprises 0.3 to 0.8 mass percent of the polyurethane particles.
In some embodiments, the antioxidant comprises 0.3 to 0.8 mass percent of the polyurethane particles.
In some embodiments, when the polyurethane powder is pneumatically conveyed, the Roots blower is used for gradually conveying the polyurethane powder, the gradually conveying is realized by reducing the conveying pipe diameter, and the purpose of gradually conveying is to enhance the conveying pressure of the polyurethane powder and disperse the polyurethane powder when entering the cavity.
The beneficial effects achieved by one or more embodiments of the present invention described above are as follows:
according to the invention, on one hand, the starting speed and the bonding strength of the poured polyurethane are changed by changing the grain composition of the powder in the grinding period, and on the other hand, the density and the number of cells of the polyurethane are changed by adjusting the conveying quantity of the powder grains, so that the water absorption rate and the heat insulation performance of the polyurethane are changed, and the quick recycling of the heat-insulating hard polyurethane is realized.
The recycling rate is high, more than 90% of polyurethane leftovers of the heat-insulating pipe can be reused in manufacturing of heat-insulating layers of the heat-insulating pipe, density secondary adjustment, foam hole adjustment and water absorption rate adjustment are achieved, and three wastes are not generated in production. The production cost is low, the produced insulation pipe offal is directly utilized for secondary addition, and the use of raw materials is reduced.
The recycling material has wide application range and high recycling value, and the particle size distribution, the addition amount and the controllability of the recycling material are beneficial to expanding the application range of the recycling polyurethane, such as promoting the addition of cement auxiliary materials, the addition of auxiliary materials of gypsum products and the like, improving the utilization value or changing the structure of raw materials and the like. The recovery process is simple, and the direct addition is directly finished by changing the particle size.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a schematic structural diagram of a recycling system for hard polyurethane scraps according to an embodiment of the present invention.
FIG. 2 is a schematic side view of the connection of the tapered storage bin to the transfer line.
FIG. 3 is another side schematic view of the connection of the tapered storage bin to the transfer line.
In the figure, 1. A cutterhead pulverizer; 2. a spiral reamer; 3. overflow ball mill; 4. a conical storage bin; 5. rotating the discharger; 6. roots blower; 7. and a conveying pipeline.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The invention is further illustrated below with reference to examples.
Example 1
As shown in fig. 1, the recycling system of the hard polyurethane scraps comprises a cutterhead type crusher 1, wherein an outlet at the lower end of the cutterhead type crusher is communicated with one end of a spiral reamer 2, the other end of the spiral reamer 2 is connected with an inlet of an overflow type ball mill 3, an outlet of the overflow type ball mill 3 is connected with an inlet of a conical storage bin 4, an outlet of the conical storage bin 4 is connected with one end of a conveying pipeline 7 through a Roots blower 6, and the other end of the conveying pipeline 7 is connected with a pouring hole of a polyurethane heat insulation pipe and is sealed;
the diameter of the conveying pipeline 7 is gradually reduced from the inlet end to the outlet end, so that the ratio of the inner diameter of the outlet end to the inner diameter of the inlet end is 1:3-7.
The inlet end of the conveying pipeline 7 is additionally provided with a flow regulating valve and a pressure sensor.
The overflow ball mill 3 is connected with a lubricant source and an antioxidant source respectively.
Powder from the overflow ball mill 3 to the conical storage bin 4 is conveyed to the spiral reamer 2 by self-overflow through the overflow ball mill 3, the spiral reamer 2 is continuously conveyed into the conical storage bin 4, and the powder is discharged into the rotary discharger 5 through self gravity and fluidity.
The conveying pipeline 7 is changed from 57mm step by step to 10mm, a flow regulating valve and a pressure sensor (or a pressure gauge) are additionally arranged at the position of the conveying pipeline 7 with 57mm, the 10mm conveying pipe is inserted into a pouring hole to be sealed, the conveying amount per minute is marked before conveying, and the input amount is controlled.
A recycling method of polyurethane leftovers for heat preservation is carried out according to the following steps:
1) Directly adding the polyurethane leftovers of the heat preservation pipe into a cutter head type pulverizer for pulverizing after sundries are removed, and rapidly pulverizing the polyurethane into uniform particles with the particle size of 0.5-1cm;
2) Adding 20kg of crushed uniform particles into a small overflow ball mill, adding 0.1kg of lubricant and 0.1kg of antioxidant in corresponding proportions, adding 100kg of matched grinding bodies (steel balls and steel segments), loading powder into a cylinder body through a hollow shaft at the feed end of the ball mill, when the ball mill cylinder rotates, enabling the grinding bodies to be attached to a cylinder lining plate under the action of inertia and centrifugal force, taking away the grinding bodies by the cylinder body under the action of friction force, and when the grinding bodies are brought to a certain height, throwing the grinding bodies under the action of gravity, like a projectile, crushing the materials in the cylinder body, and grinding polyurethane waste into polyurethane powder with 30-50 mu m particle size;
3) Powder is conveyed into a conical storage bin connected with a rotary feeder through ball milling, the powder is fed from the rotary feeder, and a mixture of air and the powder is conveyed step by step along a conveying pipe by pressure generated by a Roots blower;
4) The diameter of the conveying pipe is selected according to the conveying amount, the conveying pipe is connected with a foaming pouring pipe blowing device, and the front end of the conveying pipe is provided with a valve for adjusting the flow.
5) Before each pouring, the valve of the conveying pipeline is opened, and simultaneously, the pouring is started, the air pressure of the powder conveying pipeline is required to be more than 0.2PMa, and the polyurethane powder is prepared by the following steps: polyether: isocyanate=1:10:10 injection, e.g. 1kg powder corresponds to 10kg polyether and 10kg isocyanate. And (5) completing the molding of the heat preservation pipe. And injecting polyether and isocyanate according to the process to complete the molding of the heat-insulating pipe.
The polyurethane powder amount and the density needed to be injected before pouring the insulating pipe are used for calculating the pouring amount, and the calculating method is as follows: injection amount= (inner tube diameter + polyurethane thickness) polyurethane thickness 3.14 density-delivered amount +20% delivered amount.
The polyurethane powder particles after grinding can be uniformly distributed and firmly combined with the initiation of polyurethane in the pipe.
The relevant properties of the prepared insulating tube are shown in table 1.
Comparative example 1
The difference from example 1 is that: the polyurethane powder was omitted and the procedure was otherwise as in example 1, except that the polyether and isocyanate 1:1, calculating the material consumption according to the pipe diameter and the density, setting the injection time according to the flow of the foaming machine, and plugging and cooling after the injection is started.
The relevant properties of the insulating pipes prepared in example 1 and comparative example 1 are shown in table 1.
Table 1 physical property test data of the insulating pipes prepared in example 1 and comparative example 1
| Detecting items | Standard of | Example 1 | Comparative example 1 |
| Density (kg/m) 3 ) | ≥60 | 60.350/60.122 | 53.213/52.162 |
| Compressive Strength (MPa) | ≥0.35 | 0.367 | 0.31 |
| Water absorption (%) | ≤8 | 6.509 | 9.2 |
| Cell size (mm) | ≤0.5 | 0.194 | 0.368 |
| Closed porosity (%) | ≥90％ | 96.92 | 90.26 |
| Thermal conductivity { W/(m.times.K) } of | ≤0.033 | 0.0326 | 0.0372 |
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A recycling system of hard polyurethane leftovers is characterized in that: the device comprises a cutterhead type pulverizer, wherein an outlet at the lower end of the cutterhead type pulverizer is communicated with one end of a spiral reamer, the other end of the spiral reamer is connected with an inlet of an overflow type ball mill, an outlet of the overflow type ball mill is connected with an inlet of a storage bin, the outlet of the storage bin is connected with one end of a conveying pipeline through a fan, and the other end of the conveying pipeline is connected with a pouring hole of a polyurethane heat-insulation pipe and is sealed;
the diameter of the conveying pipeline is gradually reduced from the inlet end to the outlet end, so that the ratio of the inner diameter of the outlet end to the inner diameter of the inlet end is 1:3-7.
2. The recycling system of hard polyurethane offcuts according to claim 1, wherein: and a flow regulating valve and a pressure sensor are additionally arranged at the inlet end of the conveying pipeline.
3. The recycling system of hard polyurethane offcuts according to claim 1, wherein: the storage bin is a conical storage bin.
4. The recycling system of hard polyurethane offcuts according to claim 1, wherein: the overflow ball mill is respectively connected with a lubricant source and an antioxidant source.
5. A recycling method of hard polyurethane leftovers is characterized in that: the method comprises the following steps:
removing impurities from polyurethane scraps, crushing, adding a lubricant and an antioxidant into crushed polyurethane particles, and performing ball milling until the particle size of polyurethane powder is 30-50 mu m;
pneumatic conveying is carried out on the polyurethane powder after ball milling, and the polyurethane powder is conveyed into a polyurethane accommodating cavity through a polyurethane heat preservation pipe pouring hole;
polyether and isocyanate are injected into the accommodating cavity in proportion, and the polyurethane heat insulation layer is formed.
6. The recycling method of hard polyurethane scraps according to claim 5, wherein the recycling method is characterized in that: the polyurethane powder accounts for 3-8% of the polyurethane heat-insulating layer by mass.
7. The recycling method of hard polyurethane scraps according to claim 6, wherein the recycling method is characterized in that: the polyurethane powder accounts for 5% of the polyurethane heat-insulating layer by mass.
8. The recycling method of hard polyurethane scraps according to claim 5, wherein the recycling method is characterized in that: the lubricant accounts for 0.3 to 0.8 percent of the mass of the polyurethane particles.
9. The recycling method of hard polyurethane scraps according to claim 5, wherein the recycling method is characterized in that: the antioxidant accounts for 0.3 to 0.8 percent of the mass of the polyurethane particles.
10. The recycling method of hard polyurethane scraps according to claim 5, wherein the recycling method is characterized in that: when the polyurethane powder is pneumatically conveyed, the Roots blower is adopted to carry out step-by-step pressure conveying on the polyurethane powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310819437.7A CN116922618A (en) | 2023-07-05 | 2023-07-05 | Recycling system and recycling method for hard polyurethane leftovers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310819437.7A CN116922618A (en) | 2023-07-05 | 2023-07-05 | Recycling system and recycling method for hard polyurethane leftovers |
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| Publication Number | Publication Date |
|---|---|
| CN116922618A true CN116922618A (en) | 2023-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310819437.7A Pending CN116922618A (en) | 2023-07-05 | 2023-07-05 | Recycling system and recycling method for hard polyurethane leftovers |
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| Country | Link |
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| CN (1) | CN116922618A (en) |
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- 2023-07-05 CN CN202310819437.7A patent/CN116922618A/en active Pending
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