CN111497054B - Production method of polyurethane foam powder solid waste particles - Google Patents
Production method of polyurethane foam powder solid waste particles Download PDFInfo
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- CN111497054B CN111497054B CN202010376750.4A CN202010376750A CN111497054B CN 111497054 B CN111497054 B CN 111497054B CN 202010376750 A CN202010376750 A CN 202010376750A CN 111497054 B CN111497054 B CN 111497054B
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- polyurethane foam
- solid waste
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- 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
- B29B9/00—Making granules
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- 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
- B29B9/00—Making granules
- B29B9/16—Auxiliary treatment of granules
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- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
The invention belongs to the technical field of polyurethane solid waste recycling, and particularly discloses a production method of polyurethane foam powder solid waste particles, which comprises the steps of mixing, compressing, shaping by using a pair of rollers, granulating by using a compression roller and sorting, wherein the whole process is subjected to four times of compression, the bonding strength among polyurethane foam powder is improved by adding an adhesive, the volume of the polyurethane foam powder solid waste can be reduced by more than 15 times, and the particles are good in compactness and uniform in size. The invention can greatly reduce the transportation cost and the storage cost of polyurethane foam powder solid waste, can be conveniently added into the production of boards such as wood-plastic floors and the like, effectively reduces the generation of dust, avoids the occurrence of fire, well realizes the reutilization of waste resources and reduces the manufacturing cost of the boards.
Description
Technical Field
The invention belongs to the technical field of polyurethane solid waste recycling, and particularly relates to a production method of polyurethane foam powder solid waste particles.
Background
Along with the rapid development and wide popularization of the refrigerator manufacturing industry in China, the number of discarded refrigerators is increased dramatically, according to incomplete statistics, about 2000 thousands of discarded refrigerators in China are produced each year, and polyurethane heat-insulating materials in each refrigerator weigh about 7 kilograms, so that about 14 thousands tons of polyurethane foam waste materials are produced each year. The polyurethane foam waste is powdery polyurethane left after a recovery plant crushes polyurethane heat-insulating materials and recovers metals in the materials, the polyurethane foam powder is thermosetting plastic, the density is about 40 kg/cubic meter, at present, the polyurethane foam powder is rarely used for filling building materials such as bricks, cement and the like, and other solid wastes are used for landfill treatment, and because the waste has low density and large volume, a large amount of space of a landfill site is occupied; and because the oxygen index of the polyurethane foam powder solid waste is about 17, the polyurethane foam powder belongs to a flammable material, and in addition, the density is very small, the contact area with air is large, and a fire disaster is easy to happen if the polyurethane foam powder solid waste is not treated properly.
Because polyurethane has good heat insulation and mechanical properties, the polyurethane is often used as a raw material of a functional plate, and polyurethane foam powder solid waste is added into the plate in the prior art, and the polyurethane foam powder solid waste is usually added directly or added after being compressed for use. Such applications have the following problems: because the density of the polyurethane foam powder solid waste is low, when the polyurethane foam powder solid waste is directly added into a plate, the required foam powder is large in volume to meet the production consumption, the transportation and storage cost is greatly increased, the yield is low, and the manufacturing cost is increased; the addition after compression improves the yield to a certain extent, but cannot solve the problem of high transportation and storage cost, and also puts higher requirements on process equipment. Therefore, the application of the polyurethane foam powder solid waste in the plate is difficult to popularize.
Disclosure of Invention
The invention aims to provide a production method of polyurethane foam powder solid waste particles, which is used for preparing the polyurethane foam powder solid waste into particles, so that the difficulty of the polyurethane foam powder solid waste in plate application is effectively reduced, and the prepared particles are good in compactness and uniform in size.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
a production method of polyurethane foam powder solid waste particles comprises the following steps:
s1, mixing materials: weighing the materials according to a formula of 90-95% of polyurethane foam powder solid waste, 1-2% of thermoplastic adhesive and 5-10% of water, and then adding the materials into a low-speed mixer to mix for 5-10 minutes;
s2, compression: adding the mixed materials into a screw compressor for compression, wherein the rotating speed of the screw compressor is 10-300 r/min, and the materials are compressed to 0.06-0.07g/cm3；
S3, double-roller shaping: conveying the compressed and primarily agglomerated materials to a double-roller granulator under pressure by spiral stirring; the material is output in a granular form after passing through a pair of rollers with die holes, the rotating speed of the pair-roller granulator is 10-500 r/min, and the output granule density is 0.1-0.2g/cm3；
S4, compression roller granulation: the granules enter a compression roller granulator for further compression, and the rotation speed of the compression roller granulator is 10-300 r/min; granulating after twice compression roller pressing, the density of the granules reaches 0.7-1.0g/cm3；
S5, sorting: the granules obtained by granulating through a compression roller are sieved by an multistage vibrating screen, and the granules which are too large and too small are sieved to obtain finished product granules meeting the requirements, and then the finished product granules are packaged and put in storage; the screened particles are returned to the screw compressor for recycling.
Preferably, the thermoplastic adhesive in step S1 is polyolefin, polyvinyl alcohol or polyvinyl chloride.
Preferably, in step S1, the polyurethane foam powder solid waste is premixed with water and then mixed with the thermoplastic adhesive solid waste, or the polyurethane foam powder solid waste is premixed with the thermoplastic adhesive and then mixed with water. When the materials are mixed, the condition that the dispersity and the adhesion level of the thermoplastic adhesive in polyurethane foam powder solid waste are influenced by the fact that the thermoplastic adhesive is cured in advance due to premixing with water needs to be avoided.
Preferably, the screw compressor, the double-roller granulator and the compression roller granulator are respectively provided with a cooling system, and the temperature of the cooling liquid is less than 45 ℃.
Preferably, the pressure of the oil pump of the hydraulic system of the roll granulator in the step S3 is controlled to be 10-30 MPA. The mutual extrusion force of the two pairs of rollers is controlled by an oil pump in a hydraulic system, the pressure of the oil pump needs to be strictly controlled, the particle compactness cannot meet the requirement when the pressure is too small, and the particle molding effect is poor due to the fact that the pressure is easy to fluctuate when the pressure is too large and the synchronism of the two pairs of rollers is influenced.
Preferably, the particle size of the finished product particles obtained in the step S5 is 3-5 mm.
The invention also aims to provide equipment for realizing the production method of the polyurethane foam powder solid waste particles, which comprises a lifter, a screw compressor, a pressurizing hopper, a pair-roller granulator, a first compression roller granulator, a second compression roller granulator and a sieving machine which are sequentially arranged; a pressing block for adjusting the discharging density is arranged at the discharging end of the screw compressor; the pressurizing hopper is provided with a spiral stirring paddle and is used for stirring and pressurizing the primarily agglomerated materials and conveying the primarily agglomerated materials to the double-roller granulator; the double-roller granulator comprises a double roller with a die hole on the surface; the first compression roller granulator and the second compression roller granulator comprise compression rollers and net discs arranged below the compression rollers; the inside coarse screening net and the fine screening net that are equipped with of sifter, the surface is equipped with finished product granule export and retrieval and utilization export, the retrieval and utilization export with the feed inlet of lifting machine links to each other.
Preferably, the blades of the spiral stirring paddle are distributed densely at the upper part and sparsely at the lower part.
The invention has the following beneficial effects:
1. according to the invention, firstly, a thermoplastic adhesive and polyurethane foam powder are mixed, and then granular polyurethane is obtained through screw compression, double-roller compression moulding, secondary compression roller compression and sorting, the process is gradually compressed for four times, the bonding strength among the polyurethane foam powder is improved by adding the adhesive, the volume of the polyurethane foam powder solid waste can be reduced by more than 15 times, and the transportation cost and the storage cost can be greatly reduced; compared with direct compression, the particles are uniform and not loose, can be conveniently added into the production of wood-plastic floors and other boards, effectively reduces the generation of dust, avoids fire, well realizes the reutilization of waste resources, and reduces the manufacturing cost of the boards.
2. According to the invention, the thermoplastic plastic is selected as the adhesive, so that the bonding strength among the polyurethane foam powder in the compression process can be ensured, and the adverse effect of the adhesive on the subsequent application of the particles in the board can be effectively avoided. On one hand, because the polyurethane foam powder is compressed for four times and can be subjected to multidirectional large extrusion force, the common viscose has certain strength after being solidified, and can be easily separated from polyurethane after being extruded for multiple times, and the thermoplastic adhesive has good compatibility with the polyurethane and good flexibility, can be synchronously deformed with particles in the compression process, and cannot influence the bonding strength; on the other hand, when the particles are applied to the plate, the thermoplastic plastic can be melted and can be better integrated with other components of the plate, and the forming and mechanical properties of the plate can not be influenced. In addition, the formula of the mixed material needs to be strictly controlled to 90-95% of polyurethane foam powder solid waste, 1-2% of thermoplastic adhesive and 5-10% of water, so that the bonding strength is ensured, the bonding speed is controlled to be in a reasonable range, and the problems that discharging is difficult due to too fast bonding and particle quality is affected due to too slow bonding are avoided.
3. The compactness of the particles is improved by adopting pressurized stirring feeding in the double-roller shaping process, the polyurethane is light and is difficult to enter the double-roller granulator by the self gravity and be embedded with the die holes of the double rollers, the material density and the embedding degree of the material and the die holes can be improved by pressurized conveying, so that the particles obtained by the double rollers are compact, and the stirring is carried out while pressurizing so as to prevent the material in the hopper from being bonded into blocks in the pressurizing process to cause difficult blanking; the invention adopts a spiral stirring mode to realize pressurized conveying and stirring simultaneously, and is more optimized, the blades of the spiral stirring paddle are arranged densely at the top and sparsely at the bottom, so that the materials are in a state from loose to compact from top to bottom in the hopper, the compactness of the particles is ensured to be improved, and the continuous conveying of the materials is not influenced.
4. The double-roller molding process has the advantages that the particle size is further reduced through twice compression roller pressing, the particle compactness is improved again, the particles cannot be scattered through vibration when subsequently passing through the multistage vibrating screen, finished particles meeting requirements are obtained through the multistage vibrating screen, the size is uniform, the density is high, the screened particles are returned to be reused, and no waste is generated.
5. The invention can be applied to waste electrical appliance dismantling enterprises, directly changes polyurethane foam powder solid waste into particles, reduces the transportation cost of solid waste treatment, or sells the particles to plate type production enterprises such as wood plastic materials and the like to be used as a filling agent, thereby bringing economic benefits. The invention can also be applied to wood-plastic material production enterprises, directly changes the polyurethane foam powder solid waste into particles, is used for replacing plant fibers, and reduces the cost of raw materials.
Drawings
FIG. 1: the invention discloses a structural schematic diagram of production equipment of polyurethane foam powder solid waste particles.
FIG. 2: the internal structure of the double-roll granulator in fig. 1 is schematically shown.
FIG. 3: the internal structure of the roller granulator in fig. 1 is schematically shown.
In the figure: 1-a lifter, 2-a screw compressor, 3-a pressurizing hopper, 4-double-roller granulator, 5-a first compression roller granulator, 6-a second compression roller granulator, 7-a sieving machine, 8-a spiral stirring paddle, 9-double rollers, 10-compression rollers, 11-a net disc, 12-a finished product particle outlet, 13-a recycling outlet and 91-a die hole.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Examples
A production method of polyurethane foam powder solid waste particles is characterized in that required equipment is shown in figure 1 and comprises a lifter 1, a screw compressor 2, a pressurizing hopper 3, a pair-roller granulator 4, a first compression roller granulator 5, a second compression roller granulator 6 and a sieving machine 7 which are sequentially arranged; a pressing block for adjusting the discharging density is arranged at the discharging end of the screw compressor 2; the pressurizing hopper 3 is provided with a spiral stirring paddle 8 for stirring and pressurizing the primarily agglomerated materials and conveying the primarily agglomerated materials to the double-roller granulator 4, and blades of the spiral stirring paddle 8 are distributed to be dense at the upper part and sparse at the lower part; the double-roller granulator 4 comprises a double roller 9 with a die hole 91 on the surface, and the materials are shaped into particles by the joint extrusion of the two double rollers 9 (as shown in figure 2); the first compression roller granulator 5 and the second compression roller granulator 6 comprise compression rollers 10 and a mesh disc 11 (shown in fig. 3) arranged below the compression rollers 10; a coarse screen and a fine screen are arranged in the sieving machine 7, the sieving machine 7 is divided into a coarse screen layer, a middle layer and a fine screen layer from top to bottom, the middle layer is provided with a finished product particle outlet 12, the coarse screen layer and the fine screen layer are provided with a recycling outlet 13, and the recycling outlet 13 is connected with a feed inlet of the elevator 1; and the screw compressor 2, the pair roller granulator 4, the first compression roller granulator 5 and the second compression roller granulator 6 are all provided with cooling systems.
The method for producing the polyurethane foam powder solid waste particles by using the equipment comprises the following steps:
s1, mixing materials: weighing the materials according to a formula of 90-95% of polyurethane foam powder solid waste, 1-2% of thermoplastic adhesive and 5-10% of water, and in order to improve the distribution uniformity of the thermoplastic adhesive, premixing the polyurethane foam powder solid waste and the water, adding the premixed polyurethane foam powder solid waste and the thermoplastic adhesive into a low-speed mixer, and mixing for 5-10 minutes (or premixing the polyurethane foam powder solid waste and the thermoplastic adhesive and then mixing the premixed polyurethane foam powder solid waste and the thermoplastic adhesive with the water), wherein the thermoplastic adhesive is polyolefin, polyvinyl alcohol or polyvinyl chloride (the embodiment is polyvinyl alcohol);
s2, compression: adding the mixed material into a screw compressor 2 through a lifter 1 for compression, wherein the rotating speed of the screw compressor 2 is 10-300 r/min, and the discharging density is adjusted through a pressing block arranged at the tail end of the screw compressor 2 during discharging;
s3, double-roller shaping: the primarily agglomerated materials enter a pressurizing hopper 3 from a discharge hole of a screw compressor 2, are pressurized, stirred and conveyed to a double-roller granulator 4 through a spiral stirring paddle 8, are attached to two double rollers 9 and are embedded into a die hole 91, and are pressed into particles to be output through the reverse constant-speed rotation of the two double rollers 9; the rotating speed of the double-roller granulator 4 is 10-500 rpm, the mutual extrusion force of the two double rollers 9 is controlled by a hydraulic system, and the pressure of an oil pump of the hydraulic system is controlled to be 10-30 MPA;
s4, compression roller granulation: the particles are output by the pair roller 9 and enter the first compression roller granulator 5, the rotation speed of the compression roller granulator is 10-300 rpm, the motor drives the compression roller 10 to rotate at a high speed, the particles are compressed, then the particles fall down from the net disk 11 and enter the second compression roller granulator 6 to perform the same operation, the particles are compressed again, and granulation is completed;
s5, sorting: the granules fall to a screening machine 7 from a net disc 11 of a second compression roller granulator 6 and sequentially pass through a coarse screen and a fine screen, the screened oversize granules and undersize granules are respectively conveyed to a screw compressor 2 from recycling outlets 13 of a coarse screening layer and a fine screening layer of the screening machine 7 for recycling, finished granules meeting requirements are obtained in the middle layer, and the finished granules are packaged and stored, and the particle size of the finished granules is 3-5 mm;
in the whole process, the cooling system is started when the screw compressor 2, the pair-roller granulator 4, the first compression roller granulator 5 and the second compression roller granulator 6 are operated so as to cool materials and prevent fire, and the temperature of the cooling liquid is less than 45 ℃.
In the process, the density change of the polyurethane foam powder solid waste after four times of compression is shown in the following table:
this detailed description is to be construed as illustrative only and is not to be taken as limiting the invention, as any changes that may be made by a person skilled in the art after reading the present specification will be protected by the patent laws within the scope of the appended claims.
Claims (6)
1. A production method of polyurethane foam powder solid waste particles is characterized by comprising the following steps: the method comprises the following steps:
s1, mixing materials: weighing the materials according to a formula of 90-95% of polyurethane foam powder solid waste, 1-2% of thermoplastic adhesive and 5-10% of water, and then adding the materials into a low-speed mixer to mix for 5-10 minutes; the thermoplastic adhesive is polyolefin, polyvinyl alcohol or polyvinyl chloride; the polyurethane foam powder solid waste is premixed with water and then mixed with a thermoplastic adhesive, or the polyurethane foam powder solid waste is premixed with the thermoplastic adhesive and then mixed with water;
s2, compression: adding the mixed materials into a screw compressor for compression, wherein the rotating speed of the screw compressor is 10-300 r/min, and the materials are compressed to 0.06-0.07g/cm3；
S3, double-roller shaping: conveying the compressed and primarily agglomerated materials to a double-roller granulator under pressure by spiral stirring; the material is output in a granular form after passing through a pair of rollers with die holes, the rotating speed of the pair-roller granulator is 10-500 r/min, and the output granule density is 0.1-0.2g/cm3；
S4, compression roller granulation: the granules enter a compression roller granulator for further compression, and the rotation speed of the compression roller granulator is 10-300 r/min; granulating after twice compression roller pressing, the density of the granules reaches 0.7-1.0g/cm3；
S5, sorting: the granules obtained by granulating through a compression roller are sieved by an multistage vibrating screen, and the granules which are too large and too small are sieved to obtain finished product granules meeting the requirements, and then the finished product granules are packaged and put in storage; the screened particles are returned to the screw compressor for recycling.
2. The method for producing polyurethane foam solid waste particles as claimed in claim 1, wherein: the screw compressor, the pair roller granulator and the compression roller granulator are all provided with cooling systems, and the temperature of the cooling liquid is less than 45 ℃.
3. The method for producing polyurethane foam solid waste particles as claimed in claim 1, wherein: and S3, controlling the pressure of the oil pump of the hydraulic system of the roll granulator to be 10-30 MPA.
4. The method for producing polyurethane foam solid waste particles as claimed in claim 1, wherein: the particle size of the finished product particles obtained in the step S5 is 3-5 mm.
5. The apparatus for realizing the production method of polyurethane foam powder solid waste particles as claimed in claim 1, characterized in that: the device comprises a lifter (1), a screw compressor (2), a pressurizing hopper (3), a pair-roller granulator (4), a first compression roller granulator (5), a second compression roller granulator (6) and a sieving machine (7) which are arranged in sequence; a pressing block for adjusting the discharging density is arranged at the discharging end of the screw compressor (2); the pressurizing hopper (3) is provided with a spiral stirring paddle (8) for stirring and pressurizing the primarily agglomerated materials and conveying the primarily agglomerated materials to the double-roller granulator (4); the pair-roller granulator (4) comprises a pair of rollers (9) the surfaces of which are provided with die holes (91); the first compression roller granulator (5) and the second compression roller granulator (6) comprise compression rollers (10) and a net disc (11) arranged below the compression rollers (10); the inside coarse screening net and the fine screening net that are equipped with of sifting machine (7), the surface is equipped with finished product granule export (12) and retrieval and utilization export (13), retrieval and utilization export (13) with the feed inlet of lifting machine (1) links to each other.
6. The apparatus for realizing the production method of polyurethane foam solid waste particles as claimed in claim 5, wherein: the blades of the spiral stirring paddle (8) are distributed with the upper part dense and the lower part sparse.
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| CN113442328A (en) * | 2021-08-16 | 2021-09-28 | 杭州蓝新塑料包装有限公司 | Manufacturing system and method of PET (polyethylene terephthalate) polyester bottle based on heat and pressure resistance |
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| JPH10146831A (en) * | 1996-11-20 | 1998-06-02 | Hitachi Ltd | Method and device for waste urethane volume reduction |
| CN107916082A (en) * | 2017-11-21 | 2018-04-17 | 冯蒙蒙 | A kind of composite adhesive for strengthening aqueous polyurethane coating combination power |
| CN110894417A (en) * | 2019-12-09 | 2020-03-20 | 王青 | Plate adhesive with good adhesive property |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5553343B2 (en) * | 2010-04-30 | 2014-07-16 | 株式会社日立製作所 | Method for treating foamed polyurethane and volumetric treatment equipment for foamed polyurethane |
| CN202163031U (en) * | 2011-07-11 | 2012-03-14 | 上海申嘉三和环保科技开发有限公司 | Polyurethane volume reducing machine |
| CN104118075A (en) * | 2013-04-24 | 2014-10-29 | 上海华峰普恩聚氨酯有限公司 | Method for recycling waste rigid polyurethane foam plastics and waste spandex filaments |
| CN204036703U (en) * | 2014-03-24 | 2014-12-24 | 中山市豪威环保科技有限公司 | Hard polyurethane foams subtracts appearance recycling machine |
| WO2019241147A2 (en) * | 2018-06-11 | 2019-12-19 | Desktop Metal, Inc. | Shrinking interface layers |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH10146831A (en) * | 1996-11-20 | 1998-06-02 | Hitachi Ltd | Method and device for waste urethane volume reduction |
| CN107916082A (en) * | 2017-11-21 | 2018-04-17 | 冯蒙蒙 | A kind of composite adhesive for strengthening aqueous polyurethane coating combination power |
| CN110894417A (en) * | 2019-12-09 | 2020-03-20 | 王青 | Plate adhesive with good adhesive property |
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