CN107383305B - Recycling method of leftovers of difficultly degradable industrial polyurethane product and recycled product - Google Patents
Recycling method of leftovers of difficultly degradable industrial polyurethane product and recycled product Download PDFInfo
- Publication number
- CN107383305B CN107383305B CN201710732474.9A CN201710732474A CN107383305B CN 107383305 B CN107383305 B CN 107383305B CN 201710732474 A CN201710732474 A CN 201710732474A CN 107383305 B CN107383305 B CN 107383305B
- Authority
- CN
- China
- Prior art keywords
- product
- leftovers
- regenerated
- industrial polyurethane
- industrial
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3271—Hydroxyamines
- C08G18/3278—Hydroxyamines containing at least three hydroxy groups
- C08G18/3281—Hydroxyamines containing at least three hydroxy groups containing three hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3225—Polyamines
- C08G18/3228—Polyamines acyclic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3271—Hydroxyamines
- C08G18/3275—Hydroxyamines containing two hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0083—Foam properties prepared using water as the sole blowing agent
Abstract
The invention discloses a recycling method of leftovers of a difficult-to-degrade industrial polyurethane product and a recycled product, and relates to the technical field of recycling of high polymer materials. The recycling method comprises the following steps: uniformly mixing crushed industrial polyurethane product leftovers, a cross-linking agent, a tin catalyst and water, pressing, and heating and curing by steam to obtain a regenerated product. The invention relieves the defects that industrial polyurethane products are difficult to degrade and treat, and the currently produced regenerated polyurethane products have poor performance and are easy to deform and collapse. The method takes solid particle leftovers as raw materials, and obtains a regenerated polyurethane product through carrying out a crosslinking reaction again under the action of a crosslinking agent, a tin catalyst and water, and then carrying out pressing and molding. The environmental pollution is reduced by recycling the leftovers of the industrial polyurethane product. The regenerated product obtained by the method has the advantages of high density, high hardness, difficult deformation and collapse.
Description
Technical Field
The invention relates to the technical field of high polymer material recycling, in particular to a recycling method of leftovers of a non-degradable industrial polyurethane product and a recycled product.
Background
For industrial polyurethane polymer material products such as sponge products, a large amount of leftovers are inevitably generated in the material preparation process and the process of processing the materials into products such as furniture (e.g. sofa cushions), automobile cushions, foot pads, ironing tables, composite cotton and the like, and are generally treated as industrial wastes. Because the industrial leftovers of the polyurethane product are not easy to degrade, a large amount of space is occupied by direct burying, and the harm of the refuse city is increased; the direct incineration generates flue gas which causes great pollution to the environment.
The traditional industrial polyurethane product is prepared from liquid raw materials, and a solid polyurethane material is generated through the reaction of the liquid raw materials and a foaming agent. At present, some reprocessed products of industrial polyurethane products, such as regenerated sponge products, appear on the market, but the characteristics of good elasticity and no deformation of the sponge are mostly lost because the regenerated sponge is a reprocessed product.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
One of the purposes of the invention is to provide a recycling method of leftovers of difficultly degradable industrial polyurethane products, which takes the leftovers of the recycled industrial polyurethane products as raw materials to produce regenerated polyurethane products, thereby reducing the production cost, and the regenerated products have the advantages of high density, high hardness, difficult deformation and difficult collapse.
The second purpose of the invention is to provide a regenerated product obtained by the method for recycling leftovers of the refractory industrial polyurethane product, the regenerated product is safe and environment-friendly, does not contain harmful substances, has the advantages of high density, high hardness, difficult deformation and difficult collapse, and can be used for the fields of manufacturing sofas, mattresses, employers, sports equipment, car foot mats, ground mats and the like.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
a recycling method of leftovers of difficultly degradable industrial polyurethane products comprises the following steps:
uniformly mixing crushed industrial polyurethane product leftovers, a cross-linking agent, a tin catalyst and water, pressing, and heating and curing by steam to obtain a regenerated product.
Further, on the basis of the technical scheme provided by the invention, the reaction components are calculated by taking the leftovers of the industrial polyurethane product as 100 parts by weight: 15-20 parts of cross-linking agent, 0.2-0.3 part of tin catalyst and 2-3 parts of water.
Preferably, the weight portions of the components for reaction are calculated by taking the leftovers of the industrial polyurethane product as 100 weight portions: 16-18 parts of cross-linking agent, 0.2-0.3 part of tin catalyst and 2-3 parts of water.
Further, on the basis of the technical scheme provided by the invention, the stirring speed during mixing is 80-150 r/min; the stirring time is 5-10 min.
Preferably, on the basis of the technical scheme provided by the invention, the density of the pressed product is 40-250kg/m3。
Further, on the basis of the technical scheme provided by the invention, the steam temperature is 110-150 ℃ during curing, the air pressure value is 1-2 atmospheric pressures, and the curing time is 20-40 min.
Preferably, on the basis of the technical scheme provided by the invention, the particle diameter of the crushed industrial polyurethane product leftovers is 0.3-20 mm.
Further, on the basis of the technical scheme provided by the invention, the method also comprises the step of screening and deslagging the leftovers after recycling the leftovers of the industrial polyurethane product.
Preferably, on the basis of the technical scheme provided by the invention, the typical recycling method of the leftovers of the difficultly degradable industrial polyurethane product comprises the following steps of:
(a) recycling industrial polyurethane product leftovers, blowing out light slag through a grid, and removing heavy slag through a vibrating screen;
(b) crushing the industrial polyurethane product leftovers obtained in the step (a) into particles with the particle size of 0.3-20 mm;
(c) pumping the crushed industrial polyurethane product leftovers obtained in the step (b), the cross-linking agent, the tin catalyst and water into a reaction kettle, and mixing and stirring at a stirring speed of 80-150r/min for 5-10 min;
(d) putting the granular material obtained in the step (c) into a die box for pressing, wherein the density of the pressed product is 40-250kg/m3；
(e) Filling steam into the mold box, wherein the temperature in the mold box is 110-;
(f) curing for 20-40min in a mold box to obtain a regenerated product.
Wherein in the step (c), the weight parts of the components for reaction are calculated by taking the addition amount of the industrial polyurethane product leftovers as 100 parts by weight: 15-20 parts of cross-linking agent, 0.2-0.3 part of tin catalyst and 2-3 parts of water.
A regenerated product obtained by adopting the method for regenerating and utilizing the leftovers of the industrial polyurethane product difficult to degrade.
The regenerated cotton is obtained by adopting the method for recycling the leftovers of the non-degradable industrial polyurethane product.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method of the invention obtains the regenerated polyurethane product by recycling the industrial polyurethane leftovers, realizes the recycling of the industrial polyurethane product which is difficult to degrade, is environment-friendly and safe, and reduces the production cost.
(2) The regenerated product produced by the method has high density which can reach 40-250kg/m3The high-hardness mattress has the advantages of difficult deformation and collapse, and can be used for the fields of sofa, mattress, executive chair, sports equipment, automobile foot mat, ground mat and the like.
(3) The method is safe and environment-friendly, and the obtained regenerated product does not contain harmful substances such as lead, cadmium, mercury, polybrominated biphenyls and the like through detection, meets the quality requirement of the regenerated polyurethane product, and is a green product.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
According to one aspect of the invention, the method for recycling the leftovers of the difficult-to-degrade industrial polyurethane product comprises the following steps:
uniformly mixing crushed industrial polyurethane product leftovers, a cross-linking agent, a tin catalyst and water, pressing, and heating and curing by steam to obtain a regenerated product.
The industrial polyurethane product in the invention refers to a product with a main component made of polyurethane material, and typical but non-limiting industrial polyurethane products comprise sponge products, such as sofa cushions, automobile cushions, foot pads, ironing tables, composite cotton and the like.
The leftovers of the industrial polyurethane products refer to leftovers or waste materials remained in the processing process of the industrial polyurethane products or after the products are used, for example, the leftovers of the sponge products mainly comprise main sponges, cloth ends, thread ends, plastics or stones and the like.
The crosslinking agent may be any one commonly used for polyurethane materials without limitation, and a typical but non-limiting crosslinking agent is one or more of ethylene glycol, dipropylene glycol, glycerol, diethylene glycol, triethylene glycol, 1, 4-butanediol, triethanolamine, diethanolamine, or ethylenediamine.
A typical but non-limiting tin catalyst is stannous octoate, which catalyzes the reaction.
Water acts as a blowing agent.
The method mixes crushed industrial polyurethane product leftovers, a cross-linking agent, a tin catalyst and water, the mixed material is granular, the cross-linking agent wraps the outer surface of the granular leftovers, and the crosslinking reaction is carried out under the catalytic action of the tin catalyst and the water to form the polyurethane product.
Preferably, the mixture is uniformly mixed by adopting a stirring mode.
Steam heating can accelerate chemical reactions and cross-linking, and can kill bacteria.
Because the leftover is used for reprocessing the reprocessed product, the generated polyurethane material is loose, loses part of the properties of the original polyurethane product, has low density and hardness and is easy to deform, the product is compacted by adopting a pressing method, the density and hardness of the regenerated product are improved, the produced product is not easy to deform, and the product is cured and molded by steam heating so as to accelerate chemical reaction and crosslinking, better sterilize and finally form the regenerated polyurethane product with high density and difficult deformation.
Because the industrial leftovers of the polyurethane product are not easy to degrade, a large amount of space is occupied by direct burying, and the harm of the refuse city is increased; the direct incineration generates flue gas which causes great pollution to the environment. The traditional industrial polyurethane product is prepared from liquid raw materials, and a solid polyurethane material is generated through the reaction of the liquid raw materials and a foaming agent. At present, reprocessed products on the market, such as regenerated sponges, mostly lose the characteristics of non-collapse and non-deformation.
The whole process of the method is carried out in a solid phase mode, the particle solid leftovers are directly used as raw materials, the raw materials do not need to be dissolved in liquid for reaction, the cross-linking agent is coated on the outer surfaces of the particle leftovers through mixing, the cross-linking reaction is carried out again under the action of a tin catalyst and water, the product is difficult to loosen, has high density and is difficult to deform through pressing, the regenerated polyurethane product is obtained by combining steam heating and curing, and the regenerated polyurethane product is obtained by recycling the industrial polyurethane leftovers, so that the recycling of the industrial polyurethane product difficult to degrade is realized, the production cost is reduced, and the method conforms to the current environment-friendly concept. The regenerated product obtained by the method has the advantages of high density, high hardness, difficult deformation and collapse.
In a preferred embodiment, the weight parts of the components for the reaction are calculated according to 100 parts by weight of the leftovers of the industrial polyurethane product: 15-20 parts of cross-linking agent, 0.2-0.3 part of tin catalyst and 2-3 parts of water.
Preferably, the reaction process can be carried out in a reaction kettle, and the crushed industrial polyurethane product leftovers, the crosslinking agent, the tin catalyst and the water are pumped into the reaction kettle according to the proportion to carry out the reaction.
Typical but non-limiting parts by weight of the crosslinking agent are, for example, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts or 20 parts.
Typical but non-limiting parts by weight of the tin catalyst are, for example, 0.2 parts, 0.22 parts, 0.24 parts, 0.26 parts, 0.28 parts, or 0.3 parts.
Typical but non-limiting parts by weight of water are for example 2 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts or 3 parts.
The cross-linking agent can be coated on the outer surface of all the crushed leftover particles of the industrial polyurethane product through a certain proportion of the cross-linking agent, and the cross-linking reaction is catalyzed through a certain proportion of tin catalyst and water.
Preferably, the weight portions of the components for reaction are calculated by taking the leftovers of the industrial polyurethane product as 100 weight portions: 16-18 parts of cross-linking agent, 0.2-0.3 part of tin catalyst and 2-3 parts of water.
In a preferred embodiment, the stirring speed during mixing is 80 to 150 r/min; the stirring time is 5-10 min.
Typical but non-limiting stirring speeds are 80r/min, 90r/min, 100r/min, 110r/min, 120r/min, 130r/min, 140r/min or 150 r/min.
Typical but non-limiting stirring times are 5min, 6min, 7min, 8min, 9min or 10 min.
The leftovers, the cross-linking agent, the tin catalyst and the water are fully mixed by stirring for a certain time, and the cross-linking agent can be uniformly coated on the outer surface of the leftovers.
In a preferred embodiment, the density of the compacted product is 40-250kg/m3。
Typical, but not limiting, densities of the pressed product are, for example, 40kg/m3、50kg/m3、60kg/m3、70kg/m3、80kg/m3、90kg/m3、100kg/m3、150kg/m3、200kg/m3Or 250kg/m3The product within the density range has good hardness and is not easy to generate the problems of deformation, collapse and the like.
Preferably, the pressing process is performed in a mould box. The degree of compaction is determined by the height, the density to which compaction is required (target density) and the weight, and can be calculated using the following formula:
the pressing stroke (ram depression distance) is the height of the box-the weight of material/(the length of the box x the width of the box x the target density), where the height, length, width and stroke are in m; the weight unit is kg; density unit is kg/m3。
When the target density is 100kg/m3When the material is 100kg, the height is 2m, the width is 1m, the length is 1m, and the material is pressed to the height of 1 m; 150kg of material, height 2m, width 1m, length 1m, pressed to a height of 0.66 m; 200kg of material, height 2m, width 1m, length 1m, pressed to a height of 0.5 m.
By adopting the method, the compaction degree, namely the compaction stroke, can be calculated in advance according to the target density of the product, the product with specific density can be obtained by pressing, the product can be selectively compacted according to the requirement to obtain the regenerated products with different densities, the applicability is good, the high-density product is easy to obtain, and the regenerated product has high density and is not easy to deform.
In a preferred embodiment, the steam temperature is 110-150 ℃, the air pressure value is 1-2 atmospheric pressures, and the curing time is 20-40 min.
Preferably, steam is automatically filled into the mold box for curing and molding.
The inflation quantity control method can be used for monitoring the time and inflating for 10min by a special inflation structure; also by air pressure values.
After the air inflation, the temperature in the box is maintained at 110-150 ℃, and the air pressure value is maintained at 1-2 atmospheric pressures.
Typical but non-limiting steam temperatures are 110 deg.C, 120 deg.C, 130 deg.C, 140 deg.C or 150 deg.C.
Typical but non-limiting values of air pressure are 1 atmosphere or 2 atmospheres.
Typical but non-limiting maturation times are 20min, 25min, 30min, 35min or 40 min.
By controlling the curing temperature and curing time, the material obtains good curing effect, and the cured product has good formability. Meanwhile, the steam heating can accelerate the chemical reaction and the crosslinking, and has good sterilization effect on the leftover products.
In a preferred embodiment, the industrial polyurethane product offal is comminuted to particles having a particle size of from 0.3 to 20 mm.
Preferably, the pulverization may be performed using a pulverization apparatus. The size of the pulverized particle size can be adjusted according to the use of the product.
The particles crushed to 0.3-20mm are convenient for leftover reaction, the particle size is too small, the leftover treatment and use are not facilitated, the particle size is too large, the reaction is insufficient, and the particle size can be properly adjusted according to the application of the product.
In a preferred embodiment, the method further comprises the step of screening the industrial polyurethane product leftovers to remove slag before crushing.
The non-degradable industrial polyurethane product leftovers are recovered and then screened to remove slag, and waste residues, cloth ends, thread ends, plastics and the like are removed;
the removing method can adopt manual screening or instrument-assisted screening, and the manual screening generally distinguishes waste residues by colors; the supplementary screening of instrument can be filtered through automation equipment, blows the separation of structure cooperation graticule mesh through the gas, blows off light materials such as cloth head, end of a thread and plastics and passes the hole realization of graticule mesh and reject, rejects slag charge such as heavier stone through the shale shaker.
Impurities in the leftovers are removed by screening and deslagging, and the polyurethane material serving as a main component in the product is reserved, so that a regenerated product with better performance is obtained.
In a preferred embodiment, a typical recycling method of non-degradable industrial polyurethane product leftovers comprises the following steps:
(a) recycling industrial polyurethane product leftovers, blowing out light slag through a grid, and removing heavy slag through a vibrating screen;
(b) crushing the industrial polyurethane product leftovers obtained in the step (a) into particles with the particle size of 0.3-20 mm;
(c) pumping the crushed industrial polyurethane product leftovers obtained in the step (b), the cross-linking agent, the tin catalyst and water into a reaction kettle, and mixing and stirring at a stirring speed of 80-150r/min for 5-10 min;
(d) putting the granular material obtained in the step (c) into a die box for pressing, wherein the density of the pressed product is 40-250kg/m3；
(e) Filling steam into the mold box, wherein the temperature in the mold box is 110-150 ℃ after the steam is filled, so as to accelerate chemical reaction and crosslinking and better sterilize, and the air pressure value is 1-2 atmospheric pressures;
(f) curing for 20-40min in a mold box to obtain a regenerated product.
Wherein in the step (c), the weight parts of the components for reaction are calculated by taking the addition amount of the industrial polyurethane product leftovers as 100 parts by weight: 15-20 parts of cross-linking agent, 0.2-0.3 part of tin catalyst and 2-3 parts of water.
Preferably, the weighing capacity of the industrial polyurethane product trim in step (c) can be determined according to the requirements of the product application, the unused mould and the foaming requirements, and according to the target density of the product to be obtained.
The typical regeneration production process comprises the steps of recycling leftovers, crushing the leftovers, automatically weighing the leftovers, sucking the leftovers into a reaction kettle, adding a cross-linking agent, a catalyst and the cross-linking agent, stirring, automatically guiding the leftovers into a mold box, pressing, automatically filling steam into the mold box, curing and molding to obtain a finished product, and recycling industrial polyurethane leftovers to obtain a regenerated polyurethane product, so that the recycling of the industrial polyurethane product difficult to degrade is realized.
According to another aspect of the invention, a regenerated product obtained by the method for recycling the leftovers of the refractory industrial polyurethane product is provided.
Preferably, the recycled product is recycled cotton.
Compared with the existing regenerated polyurethane product (regenerated cotton), the regenerated product obtained by the regeneration and utilization method has the advantages of high density, high hardness, difficult deformation and difficult collapse.
For further understanding of the present invention, the method and effects of the present invention will be described in further detail with reference to specific examples. All the raw materials related to the invention can be obtained commercially.
The industrial polyurethane products adopted in the embodiment are polyurethane sponge products such as sofas, cushions, composite cotton and the like. The leftovers of the industrial polyurethane product adopted in the embodiment are waste materials in the production process of the polyurethane sponge product.
Example 1
A recycling method of leftovers of difficultly degradable industrial polyurethane products comprises the following steps:
(a) and (3) recovering and screening: the leftovers of the industrial polyurethane product are recovered, and impurities such as cloth ends, thread ends, plastics and the like are removed;
(b) crushing: crushing the leftovers into particles with the particle size of 0.3 mm;
(c) reaction: weighing 100kg of crushed leftovers, putting the leftovers into a reaction kettle, adding 15kg of cross-linking agent, 0.25kg of tin catalyst and 2.5kg of water, and mixing and stirring for 10min at a stirring speed of 80 r/min;
(d) pressing: putting the reacted materials into a die box for pressing, and pressing into a box body with the length of 1m, the width of 1m and the height of 1 m;
(e) filling steam into the mold box, wherein the temperature in the mold box is 110 ℃ after the steam is filled, and the air pressure value is 1 atmosphere;
(f) aging in a mold box for 40min to obtain regenerated product.
Example 2
A recycling method of leftovers of difficultly degradable industrial polyurethane products comprises the following steps:
(a) and (3) recovering and screening: the leftovers of the industrial polyurethane product are recovered, and impurities such as cloth ends, thread ends, plastics and the like are removed;
(b) crushing: crushing the leftovers into particles with the particle size of 20 mm;
(c) reaction: weighing 100kg of crushed leftovers, putting the leftovers into a reaction kettle, adding 20kg of cross-linking agent, 0.28kg of tin catalyst and 2kg of water, and mixing and stirring for 5min at a stirring speed of 150 r/min;
(d) pressing: putting the reacted materials into a die box for pressing, and pressing into a box body with the length of 1m, the width of 1m and the height of 1 m;
(e) filling steam into the mold box, wherein the temperature in the mold box is 150 ℃ after the steam is filled, and the air pressure value is 2 atmospheric pressures;
(f) aging in a mold box for 20min to obtain regenerated product.
Example 3
A recycling method of leftovers of difficultly degradable industrial polyurethane products comprises the following steps:
(a) and (3) recovering and screening: the leftovers of the industrial polyurethane product are recovered, and impurities such as cloth ends, thread ends, plastics and the like are removed;
(b) crushing: crushing the leftovers into particles with the particle size of 0.5 mm;
(c) reaction: weighing 100kg of crushed leftovers, putting the leftovers into a reaction kettle, adding 16kg of cross-linking agent, 0.26kg of tin catalyst and 3kg of water, and mixing and stirring for 7min at a stirring speed of 120 r/min;
(d) pressing: putting the reacted materials into a die box for pressing, and pressing into a box body with the length of 1m, the width of 1m and the height of 0.4 m;
(e) filling steam into the mold box, wherein the temperature in the mold box is 120 ℃ after the steam is filled, and the air pressure value is 2 atmospheric pressures;
(f) aging in a mold box for 30min to obtain regenerated product.
Example 4
A recycling method of leftovers of difficultly degradable industrial polyurethane products comprises the following steps:
(a) and (3) recovering and screening: the leftovers of the industrial polyurethane product are recovered, and impurities such as cloth ends, thread ends, plastics and the like are removed;
(b) crushing: crushing the leftovers into particles with the particle size of 1 mm;
(c) reaction: weighing 100kg of crushed leftovers, putting the leftovers into a reaction kettle, adding 18kg of cross-linking agent, 0.24kg of tin catalyst and 2.2kg of water, and mixing and stirring for 8min at a stirring speed of 90 r/min;
(d) pressing: putting the reacted materials into a die box for pressing, and pressing into a box body with the length of 1m, the width of 1m and the height of 0.6 m;
(e) filling steam into the mold box, wherein the temperature in the mold box is 140 ℃ after the steam is filled, and the air pressure value is 1 atmosphere;
(f) curing for 25min in a mould box to obtain a regenerated product.
Example 5
A recycling method of leftovers of difficultly degradable industrial polyurethane products comprises the following steps:
(a) and (3) recovering and screening: the leftovers of the industrial polyurethane product are recovered, and impurities such as cloth ends, thread ends, plastics and the like are removed;
(b) crushing: crushing the leftovers into particles with the particle size of 2 mm;
(c) reaction: weighing 100kg of crushed leftovers, putting the leftovers into a reaction kettle, adding 17kg of cross-linking agent, 0.22kg of tin catalyst and 2.4kg of water, and mixing and stirring for 9min at a stirring speed of 100 r/min;
(d) pressing: putting the reacted materials into a die box for pressing, and pressing into a box body with the length of 1m, the width of 1m and the height of 0.8 m;
(e) filling steam into the mold box, wherein the temperature in the mold box is 130 ℃ after the steam is filled, and the air pressure value is 1 atmosphere;
(f) curing for 25min in a mould box to obtain a regenerated product.
Example 6
A recycling method of leftovers of difficultly degradable industrial polyurethane products comprises the following steps:
(a) and (3) recovering and screening: the leftovers of the industrial polyurethane product are recovered, and impurities such as cloth ends, thread ends, plastics and the like are removed;
(b) crushing: crushing the leftovers into particles with the particle size of 5 mm;
(c) reaction: weighing 100kg of crushed leftovers, putting the leftovers into a reaction kettle, adding 19kg of cross-linking agent, 0.25kg of tin catalyst and 2.6kg of water, and mixing and stirring for 6min at a stirring speed of 120 r/min;
(d) pressing: putting the reacted materials into a die box for pressing, and pressing into a box body with the length of 1m, the width of 1m and the height of 1.5 m;
(e) filling steam into the mold box, wherein the temperature in the mold box is 135 ℃ after the steam is filled, and the air pressure value is 1.5 atmospheric pressures;
(f) aging in a mold box for 35min to obtain regenerated product.
Example 7
A recycling method of leftovers of difficultly degradable industrial polyurethane products comprises the following steps:
(a) and (3) recovering and screening: the leftovers of the industrial polyurethane product are recovered, and impurities such as cloth ends, thread ends, plastics and the like are removed;
(b) crushing: crushing the leftovers into particles with the particle size of 10 mm;
(c) reaction: weighing 100kg of crushed leftovers, putting the leftovers into a reaction kettle, adding 20kg of cross-linking agent, 0.2kg of tin catalyst and 2.8kg of water, and mixing and stirring for 7min at a stirring speed of 130 r/min;
(d) pressing: putting the reacted materials into a die box for pressing, and pressing into a box body with the length of 1m, the width of 1m and the height of 2 m;
(e) filling steam into the mold box, wherein the temperature in the mold box is 145 ℃ after the steam is filled, and the air pressure value is 1 atmosphere;
(f) aging in a mold box for 30min to obtain regenerated product.
Example 8
A recycling method of leftovers of difficultly degradable industrial polyurethane products comprises the following steps:
(a) and (3) recovering and screening: the leftovers of the industrial polyurethane product are recovered, and impurities such as cloth ends, thread ends, plastics and the like are removed;
(b) crushing: crushing the leftovers into particles with the particle size of 15 mm;
(c) reaction: weighing 100kg of crushed leftovers, putting the leftovers into a reaction kettle, adding 15kg of cross-linking agent, 0.3kg of tin catalyst and 3kg of water, and mixing and stirring for 8min at a stirring speed of 100 r/min;
(d) pressing: putting the reacted materials into a die box for pressing, and pressing into a box body with the length of 1m, the width of 1m and the height of 1.5 m;
(e) filling steam into the mold box, wherein the temperature in the mold box is 125 ℃ after the steam is filled, and the air pressure value is 2 atmospheric pressures;
(f) aging in a mold box for 36min to obtain regenerated product.
Example 9
A recycling method of leftover bits and pieces of industrial polyurethane products difficult to degrade is disclosed, wherein the amount of the cross-linking agent added in the step (c) is 10kg, and other steps are the same as those in the example 1.
Example 10
A recycling method of leftover bits and pieces of difficultly degraded industrial polyurethane products is disclosed, wherein the amount of tin catalyst added in the step (c) is 0.1kg, and other steps are the same as the example 2.
Example 11
A recycling method of leftovers of difficultly degradable industrial polyurethane products, wherein the amount of water added in the step (c) is 5kg, and the other steps are the same as those in example 3.
Example 12
A recycling method of leftover bits and pieces of industrial polyurethane products difficult to degrade is provided, wherein the curing temperature in the step (e) is 90 ℃, and other steps are the same as the embodiment 4.
Example 13
A recycling method of leftover bits and pieces of industrial polyurethane products difficult to degrade is provided, wherein the curing temperature in the step (e) is 180 ℃, and other steps are the same as the example 5.
Comparative example
The method of CN 105482437A patent is adopted to prepare the regenerated sponge, and the steps comprise:
(a) putting the sponge leftovers into a crusher, and crushing the sponge leftovers into sponge particles;
(b) putting the sponge particles obtained in the step (a) into a reaction kettle, adding regenerated sponge glue, stirring at the speed of 120r/min for 20 minutes to obtain a semi-finished product;
(c) performing primary sterilization on the semi-finished product in the step (b), putting the semi-finished product into a closed disinfection chamber, putting a bactericide into a heater, and heating and fumigating for 2.5 hours;
(d) putting the semi-finished product subjected to primary sterilization in the step (c) into a hot-pressing sterilizer, and performing high-temperature steam sterilization for 15-20 minutes;
(e) and (3) putting the sterilized semi-finished product into a mold for compression molding, ventilating and drying, putting into a closed container, injecting nitrogen to remove odor, cutting and packaging.
The regenerated sponge products were produced by the methods of examples 1-13 and comparative example, and the properties and performance indexes of the regenerated products are shown in table 1.
TABLE 1 Property Performance indices of regenerated sponge products produced in examples and comparative examples
Note: the density, tensile strength and indentation hardness (25%) were averaged and indentation hardness (25%) indicated a measurement of 25% of the thickness of the sample pressed into the indenter.
As can be seen from Table 1, the recycled product obtained by the recycling method of the invention has the advantages of high density, high hardness, difficult deformation and collapse, the traditional industrial polyurethane product is prepared by combining liquid raw materials with a foaming agent in the production process, and the density of the obtained industrial polyurethane product is generally 5-50 kg/m3In accordance with the present inventionThe recycling method takes solid particles as raw materials, and can obtain a high-density recycled product through pressing, wherein the density of the recycled polyurethane product is 40-250kg/m3The pressing height of the product is adjusted, so that products with different densities can be obtained as required, and therefore, the regenerated product obtained by the reaction of the solid material can obtain products with a wider density range, the leftovers can be recycled, and the products with different densities can be widely applied.
The regenerated product obtained by the method has higher tensile strength and indentation hardness, is not easy to deform and collapse, and the average tensile strength and the average indentation hardness (25%) of the regenerated product obtained by the methods in examples 1-8 are 90-115KPa and 130-150N respectively.
In example 9, the amount of the crosslinking agent used was smaller than that in example 1, in example 10, the amount of the tin catalyst used was smaller than that in example 2, and in example 11, the amount of water used was larger than that in example 3, and the tensile strength and indentation hardness of the reclaimed product obtained were reduced to some extent. Therefore, the leftovers, the cross-linking agent, the catalyst and the water are kept in a proper proportion, and a regenerated product with better strength, hardness and performance can be obtained.
In example 12, the curing temperature was lower than that in example 4, and in example 13, the curing temperature was higher than that in example 5, and thus, a good curing effect was not obtained, and the moldability of the product was poor, and the tensile strength and the indentation hardness were also lowered. Therefore, the product can be better molded at a proper curing temperature, and the product performance is further improved.
The regenerated cotton produced by adopting the comparative example has lower tensile strength and indentation hardness, and has larger difference with the regenerated cotton product produced by the method, so that the method can obtain good effect by reasonably matching the steps and the added materials, and the obtained regenerated product has excellent performance in all aspects.
In addition, the regenerated product produced by the method is safe and environment-friendly, does not contain harmful substances such as lead, cadmium, mercury, polybrominated biphenyls and the like through detection, meets the quality requirement of the regenerated polyurethane product, and is a green product.
In conclusion, the method obtains the regenerated polyurethane product by recycling the industrial polyurethane leftovers, realizes the recycling of the industrial polyurethane product which is difficult to degrade, is environment-friendly and safe, and reduces the production cost. The regenerated polyurethane product has the advantages of high density, high hardness, difficult deformation and collapse and wide application, and can be used for manufacturing sofas, mattresses, chairs for boss, sports equipment and other fields.
While particular embodiments of the present invention have been illustrated and described, it would be obvious that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
Claims (3)
1. A recycling method of leftovers of difficultly degradable industrial polyurethane products is characterized by comprising the following steps:
(a) recycling industrial polyurethane product leftovers, blowing out light slag through a grid, and removing heavy slag through a vibrating screen;
(b) crushing the industrial polyurethane product leftovers obtained in the step (a) into particles with the particle size of 0.3-20 mm;
(c) pumping the crushed industrial polyurethane product leftovers obtained in the step (b), the cross-linking agent, the tin catalyst and water into a reaction kettle, and mixing and stirring at a stirring speed of 80-150r/min for 5-10 min;
(d) putting the granular material obtained in the step (c) into a die box for pressing, wherein the density of the pressed product is 40-250kg/m3；
(e) Filling steam into the mold box, wherein the temperature in the mold box is 110-;
(f) curing for 20-40min in a mold box to obtain a regenerated product;
wherein in the step (c), the weight parts of the components for reaction are calculated by taking the addition amount of the industrial polyurethane product leftovers as 100 parts by weight: 15-20 parts of cross-linking agent, 0.2-0.3 part of tin catalyst and 2-3 parts of water;
the cross-linking agent is one or more of ethylene glycol, dipropylene glycol, glycerol, diethylene glycol, triethylene glycol, 1, 4-butanediol, triethanolamine, diethanolamine or ethylenediamine.
2. A recycled product obtained by the recycling method of the leftovers of the difficultly degradable industrial polyurethane product of claim 1.
3. The regenerated cotton obtained by the method for recycling the leftovers of the difficultly degradable industrial polyurethane product of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710732474.9A CN107383305B (en) | 2017-08-23 | 2017-08-23 | Recycling method of leftovers of difficultly degradable industrial polyurethane product and recycled product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710732474.9A CN107383305B (en) | 2017-08-23 | 2017-08-23 | Recycling method of leftovers of difficultly degradable industrial polyurethane product and recycled product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107383305A CN107383305A (en) | 2017-11-24 |
| CN107383305B true CN107383305B (en) | 2021-02-02 |
Family
ID=60345430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710732474.9A Active CN107383305B (en) | 2017-08-23 | 2017-08-23 | Recycling method of leftovers of difficultly degradable industrial polyurethane product and recycled product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107383305B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108715679A (en) * | 2018-05-22 | 2018-10-30 | 广汉市新鸿海绵有限公司 | A kind of PU sponges of good permeability and preparation method thereof |
| CN110733156A (en) * | 2019-09-06 | 2020-01-31 | 广州傲胜人造草股份有限公司 | Processing technology of polyurethane cushion layers and artificial turf cushion layer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935132A (en) * | 1974-04-15 | 1976-01-27 | Union Carbide Corporation | Thermoplastic urethane polymer filled with cross-linked urethane polymer |
| CN1093548C (en) * | 2000-08-17 | 2002-10-30 | 东莞富增泡棉塑胶有限公司 | Process for reclaiming waste polyurethane foam |
| CN101445582B (en) * | 2008-12-10 | 2010-10-06 | 合肥安利聚氨酯新材料有限公司 | Method for recycling and regenerating waste polyurethane resin |
| CN105017581B (en) * | 2015-08-19 | 2016-09-07 | 常州工程职业技术学院 | A kind of modified abandoned RPUF activity micro mist strengthens the preparation method of elastomeric material |
| CN105330891A (en) * | 2015-10-22 | 2016-02-17 | 烟台正海合泰科技股份有限公司 | Recovery reutilization method for polyurethane foam waste material |
| CN106426636A (en) * | 2016-08-11 | 2017-02-22 | 桂林市春晓环保科技有限公司 | Recovery process of waste cross-linked polyurethane |
-
2017
- 2017-08-23 CN CN201710732474.9A patent/CN107383305B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107383305A (en) | 2017-11-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107383305B (en) | Recycling method of leftovers of difficultly degradable industrial polyurethane product and recycled product | |
| KR20160046590A (en) | Manufacturing method of wpc | |
| CN111825887A (en) | Composite material containing coffee grounds and preparation method thereof | |
| CN105884249A (en) | Construction material prepared by compounding plastic and solid waste and manufacturing method thereof | |
| CN107471509A (en) | The foaming method and expanded material of a kind of thermoplastic elastomer (TPE) | |
| CN113146883A (en) | Recycling and reusing molding process based on waste sponge | |
| KR101874086B1 (en) | Method for manufacturing activated carbon | |
| JP2003335886A (en) | Process for preparing composite resin foam | |
| KR102128787B1 (en) | Biodegradable In-mold Container With Improved Impacts Strength, And Method For Manufacturing The Same | |
| JP4356085B2 (en) | Recycled polyurethane foam waste material and recycled polyurethane molded body | |
| JPH0748112A (en) | Preparation of carbon molecular sieve | |
| JP3509750B2 (en) | Method for producing composite molding material for processed vegetable food residue and molding method using the composite molding material | |
| JP3663512B2 (en) | Paper-polyurethane composite recycled molded article and method for producing the same | |
| CN100575053C (en) | Make the method for special packaging, sheet material with waste EPS foam plastics | |
| KR102629940B1 (en) | Composition for manufacturing synthetic resin slippers and slippers manufactured using the same | |
| WO2007049973A2 (en) | Rebond mould | |
| CN109532076B (en) | Preparation method of fragrant automobile sound insulation pad | |
| CN115536899A (en) | Lightweight sound-absorbing circulating foam and preparation method thereof | |
| EP4289585A1 (en) | Process for recycling a polyester-based material | |
| KR20100127614A (en) | Method for producing shaped bodies including charcoal and shaped bodies there from | |
| Berthevas et al. | Recycled polyurethane foam powder can be used in conjunction with PMDI in particleboards to obtain the required properties while reducing costs | |
| KR100603236B1 (en) | Method for Treatment and Recycle of Large Size of Wooden Wastes | |
| TW303311B (en) | Recycling method of waste material | |
| KR101076387B1 (en) | Process of yellow soil product through recycling polyurethane | |
| KR20220135907A (en) | Manufacturing method of molded product using coffee ground |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230721 Address after: 063000 Linjin Industrial Park, Hangu Administrative Zone, Tangshan City, Hebei Province Patentee after: TANGSHAN YIMEI TECHNOLOGY Co.,Ltd. Address before: 101400 east of Guozhuang village committee, Yangsong Town, Huairou District, Beijing Patentee before: BEIJING JIAMEI TECHNOLOGY CO.,LTD. |