CN111516183A - Recycling method of waste mask - Google Patents
Recycling method of waste mask Download PDFInfo
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- CN111516183A CN111516183A CN202010259654.1A CN202010259654A CN111516183A CN 111516183 A CN111516183 A CN 111516183A CN 202010259654 A CN202010259654 A CN 202010259654A CN 111516183 A CN111516183 A CN 111516183A
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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
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/04—Disintegrating plastics, e.g. by milling
- B29B17/0412—Disintegrating plastics, e.g. by milling to large particles, e.g. beads, granules, flakes, slices
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- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/04—Particle-shaped
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/20—Recycled plastic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
Abstract
The invention relates to a recycling method of a waste mask, which comprises the following steps: (1) removing a nose bridge strip of the waste mask, making a mask body and a hanging rope of the waste mask into fragments to obtain mask fragments, and drying the mask fragments for later use; the cover body is made of non-woven fabric made of polypropylene resin with the melt index of 40g/10 min-3000 g/10min, and the hanging rope is made of polyurethane elastomer; (2) mixing the dried mask fragments with a coupling agent, a reinforcing agent, an antioxidant, a pigment and an antibacterial agent by using a mixing extruder, then extruding, and granulating to obtain a polypropylene composite material based on the waste mask; the method recycles the waste mask to prepare the polypropylene composite material, not only can solve the problem of environmental pollution caused by the waste mask, but also can ensure that the prepared polypropylene composite material has better mechanical property, antibacterial property and the like.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a recycling method of a waste mask.
Background
Wearing the mask is the simplest and most effective method for blocking the spread and infection of epidemic situations, but due to the epidemic situations, the using amount of the mask is increased rapidly, and meanwhile, some subsequent problems which cannot be avoided but are not paid much attention are also raised, wherein the least neglect is how to treat the used waste mask.
The mask is estimated to be used in at least about 5.33 billion per person per day in the second industry, medical, transportation, etc. industry, as calculated as one mask per person per day. Calculated according to the average weight of 5g of the common three-layer disposable mask, at least two thousand and six hundred tons of medical wastes are generated every day in China, and great pressure is generated on the environment of China.
The structure of the common disposable mask mainly comprises a mask body, a hanging rope and a nose bridge strip, wherein the mask body is made of non-woven fabric made of high-fluidity polypropylene resin, the hanging rope is made of an elastomer made of polyurethane, and the nose bridge strip is formed by compounding iron wires and polypropylene resin. Except that the nose bridge strip is difficult to recycle due to the iron wires, the polymer-based composite material with high performance and high added value is prepared by recycling the characteristics of the rest parts of the waste disposable mask, has excellent ecological and economic benefits, and is greatly helpful for solving the problems of environmental pollution and resource shortage.
Disclosure of Invention
In order to solve the technical problem of environmental pollution caused by the waste mask, a recycling method of the waste mask is provided. The polypropylene composite material prepared by recycling the polypropylene composite material disclosed by the invention not only can solve the problem of environmental pollution caused by waste masks, but also has better mechanical properties, antibacterial properties and the like.
A recycling method of a waste mask comprises the following steps:
(1) removing a nose bridge strip of the waste mask, making a mask body and a hanging rope of the waste mask into fragments to obtain mask fragments, and drying the mask fragments for later use; the mask body is made of non-woven fabric made of polypropylene resin, the melt index of the non-woven fabric is 40g/10 min-3000 g/10min, and the hanging rope is made of polyurethane elastomer;
(2) mixing the dried mask fragments with a coupling agent, a reinforcing agent, an antioxidant, a pigment and an antibacterial agent by using a mixing extruder, then extruding, and granulating to obtain a polypropylene composite material based on the waste mask;
the weight ratio of the mask fragments, the coupling agent, the reinforcing agent, the antioxidant, the pigment and the antibacterial agent in the polypropylene composite material is (70-80): 50-10): 5-10): 1-2): 5-10.
Further, the banburying extruder comprises a banburying part and an extruding part; the banburying rotation speed of the banburying part is 50 to 100rpm, and the banburying processing temperature is 160 to 220 ℃; the feeding speed of the extrusion part is 20-50 rpm, the extrusion processing temperature is 160-220 ℃, and the screw rotating speed is 50-200 rpm. Firstly carrying out banburying processing on a banburying part, and then carrying out extrusion processing on an extrusion part, wherein the mask fragments are melted during banburying of the banburying part, so that an auxiliary agent is added and can be uniformly dispersed in a matrix formed by the mask fragments, and then the extrusion processing of the extrusion part can be carried out; the mask pieces are too dense to be extruded directly into an extruder.
Further, the coupling agent is one or more of KH-151, KH-550, KH-560 and KH-570.
Further, the reinforcing agent is one or more of calcium carbonate, silicon dioxide and talcum powder.
Further, the antioxidant is one or more of antioxidant 1010, antioxidant CA, antioxidant 145 and antioxidant 168.
Further, the pigment is one or more of titanium white, iron yellow, iron red, iron blue, carbon black, iron black and phthalocyanine green.
Further, the antibacterial agent is one or more of silver nitrate, zinc oxide, copper oxide, ammonium dihydrogen phosphate and silver carbonate.
Further, the polypropylene composite material also comprises an antistatic agent, and the weight ratio of the antistatic agent to the mask fragments is (3-5): (70-80).
Furthermore, the antistatic agent is one or more of carbon black, carbon fiber, graphene, carbon nano tube, polypyrrole, polyaniline and MXene.
The beneficial technical effects are as follows:
(1) the mask body of the waste mask is made of non-woven fabrics made of polypropylene resin, the melt index is 40g/10 min-3000 g/10min, the waste mask has high fluidity, the hanging rope is made of polyurethane elastomer, the weight of the mask body of the common waste mask is about 5g, the weight of the hanging rope is about 0.3 g-0.5 g, and the mask body weight is larger for an N95 mask with better protective performance; according to the invention, the mask body is used as a composite material substrate, the mixed hanging rope is used as a toughening agent of the composite material, and other processing aids are added to prepare the polypropylene composite material, so that the environmental pollution caused by the fact that the waste mask is used as medical waste can be remarkably reduced; the process of recycling the waste mask is very simple, the residual mask body and the hanging rope are uniformly made into fragments only by removing the nose bridge strip of the waste mask, and the mask body and the hanging rope are not required to be separated, so that the energy consumption and pressure of the post-treatment of the medical waste can be reduced, the recycling efficiency of raw materials is improved, and the cyclic utilization of resources is promoted;
(2) the method does not need to carry out additional disinfection and sterilization treatment on the waste mask, and can simultaneously complete the preparation of the composite material and the disinfection and sterilization of the raw materials through the high-temperature melting stage in the melting and blending processing process; the method has simple process and low cost, and is convenient for large-scale production;
(3) the mask body component of the waste mask as the raw material matrix is high-fluidity polypropylene resin, and when the composite material is prepared in the melt blending processing process, various modification aids are convenient to add due to the low melt viscosity of the high-fluidity polypropylene resin, so that the high-fluidity polypropylene resin can be uniformly dispersed in the composite material matrix, and therefore, the method does not need to additionally add processing aids such as a dispersing agent, a plasticizer, a lubricating agent, a compatilizer and the like, reduces the preparation cost of the composite material, simplifies the production flow and reduces the environmental pollution in the production process;
(4) the polyurethane hanging rope of the waste mask is used as the toughening agent of the polypropylene non-woven fabric mask body, and the material has good impact resistance without adding a beta nucleating agent and a compatilizer, so that the preparation cost of the composite material is reduced; when the content of the polyurethane hanging rope is below 10 wt%, the toughening effect on the polypropylene non-woven fabric cover body is very obvious, so that a compatilizer is not required to be additionally added to increase the cost;
(5) the prepared composite material has good mechanical property and an antibacterial function, and can be added with an antistatic material according to requirements to enable the composite material to have an antistatic property at the same time, so that the composite material has wide application in the industries of aerospace, medical treatment, electronic products and the like.
Detailed Description
The invention is further described below with reference to specific examples, but without limiting the scope of the invention.
The structure of the waste mask collected in the following examples is a mask body, a hanging rope and a nose bridge strip, the melt index of the mask body of the waste mask is in the range of 40g/10 min-3000 g/10min, the mask body is made of non-woven fabric made of polypropylene resin, and the hanging rope is made of polyurethane elastomer.
Example 1
A recycling method of a waste mask comprises the following steps:
(1) removing a nose bridge strip of the waste mask, making a mask body and a hanging rope of the waste mask into fragments to obtain mask fragments, and drying the mask fragments for later use; the mask body is made of non-woven fabric made of polypropylene resin, the melt index of the non-woven fabric is 40g/10 min-3000 g/10min, and the hanging rope is made of polyurethane elastomer;
(2) firstly banburying the dried mask fragments, a coupling agent, a reinforcing agent, an antioxidant, a pigment, an antibacterial agent and an antistatic agent by using a banburying extruder, and then extruding, wherein the banburying extruder comprises a banburying part and an extruding part, the banburying part is a banburying machine, the extruding part is a single-screw extruder, the banburying speed of the banburying part is 100rpm, the banburying processing temperature is 200 ℃, the banburied materials are automatically turned into a hopper of the extruding part, the feeding speed is adjusted to be 30rpm, the extruding processing temperature is adjusted to be 180 ℃, and the screw rotating speed is adjusted to be 80 rpm; granulating to obtain a polypropylene composite material based on the waste mask;
the polypropylene composite material contains 70 parts by weight of the mask fragments, 10 parts by weight of coupling agent, 5 parts by weight of reinforcing agent, 1 part by weight of antioxidant, 5 parts by weight of pigment, 5 parts by weight of antibacterial agent and 4 parts by weight of antistatic agent;
wherein the coupling agent is KH-151; the reinforcing agent is calcium carbonate; the antioxidant is antioxidant CA; the pigment is iron yellow; the antibacterial agent is silver carbonate; the antistatic agent is graphene.
Example 2
A recycling method of a waste mask comprises the following steps:
(1) removing a nose bridge strip of the waste mask, making a mask body and a hanging rope of the waste mask into fragments to obtain mask fragments, and drying the mask fragments for later use; the mask body is made of non-woven fabric made of polypropylene resin, the melt index of the non-woven fabric is 40g/10 min-3000 g/10min, and the hanging rope is made of polyurethane elastomer;
(2) firstly banburying the dried mask fragments, a coupling agent, a reinforcing agent, an antioxidant, a pigment, an antibacterial agent and an antistatic agent by using a banburying extruder, and then extruding, wherein the banburying extruder comprises a banburying part and an extruding part, the banburying part is a banburying machine, the extruding part is a single-screw extruder, the banburying speed of the banburying part is 50rpm, the banburying processing temperature is 160 ℃, the banburied materials are automatically turned into a hopper of the extruding part, the feeding speed is adjusted to be 20rpm, the extruding processing temperature is adjusted to be 160 ℃, and the screw rotating speed is adjusted to be 70 rpm; granulating to obtain a polypropylene composite material based on the waste mask;
the polypropylene composite material comprises 80 parts by weight of the mask fragments, 5 parts by weight of coupling agent, 7 parts by weight of reinforcing agent, 2 parts by weight of antioxidant, 8 parts by weight of pigment, 7 parts by weight of antibacterial agent and 5 parts by weight of antistatic agent;
wherein the coupling agent is KH-550; the reinforcing agent is silicon dioxide; the antioxidant is antioxidant 168; the pigment is titanium white; the antibacterial agent is silver nitrate; the antistatic agent is a mixture of carbon black and carbon fibers.
Example 3
A recycling method of a waste mask comprises the following steps:
(1) removing a nose bridge strip of the waste mask, making a mask body and a hanging rope of the waste mask into fragments to obtain mask fragments, and drying the mask fragments for later use; the mask body is made of non-woven fabric made of polypropylene resin, the melt index of the non-woven fabric is 40g/10 min-3000 g/10min, and the hanging rope is made of polyurethane elastomer;
(2) firstly banburying the dried mask fragments, a coupling agent, a reinforcing agent, an antioxidant, a pigment, an antibacterial agent and an antistatic agent by using a banburying extruder, and then extruding, wherein the banburying extruder comprises a banburying part and an extruding part, the banburying part is a banburying machine, the extruding part is a single-screw extruder, the banburying speed of the banburying part is 100rpm, the banburying processing temperature is 210 ℃, the banburied materials are automatically turned into a hopper of the extruding part, the feeding speed is adjusted to 40rpm, the extruding processing temperature is adjusted to 190 ℃, and the screw rotating speed is adjusted to 150 rpm; granulating to obtain a polypropylene composite material based on the waste mask;
the polypropylene composite material contains 75 parts by weight of the mask fragments, 8 parts by weight of coupling agent, 6 parts by weight of reinforcing agent, 1.3 parts by weight of antioxidant, 6 parts by weight of pigment, 9 parts by weight of antibacterial agent and 3.4 parts by weight of antistatic agent;
wherein the coupling agent is a mixture of KH-560 and KH-570, and the weight ratio of KH-560 to KH-570 is 3: 7; the reinforcing agent is a mixture of silicon dioxide and talcum powder, and the weight ratio of the silicon dioxide to the talcum powder is 2: 1; the antioxidant is antioxidant 168; the pigment is a mixture of iron oxide red and iron oxide blue, and is prepared according to the required color; the antibacterial agent is a mixture of copper oxide and ammonium dihydrogen phosphate, and the weight ratio of the copper oxide to the ammonium dihydrogen phosphate is 1: 2; the antistatic agent is MXene.
The material ratios of the polypropylene composite material based on the waste respirator prepared in the above example are shown in table 1.
Table 1 ratio of each material in the polypropylene composite material based on the waste masks prepared in examples 1 to 3
| Parts by weight of each material | Example 1 | Example 2 | Example 3 |
| Gauze mask piece | 70 | 80 | 75 |
| Coupling agent | 10 | 5 | 8 |
| Reinforcing agent | 5 | 7 | 6 |
| Antioxidant agent | 1 | 2 | 1.3 |
| Pigment (I) | 5 | 8 | 6 |
| Antibacterial agent | 5 | 7 | 9 |
| Antistatic agent | 4 | 5 | 3.4 |
The polypropylene composite material based on the waste mask prepared in the above example is in accordance with the current GB-T
1040.1 and GBT 1843 national standards test the tensile strength and impact strength of the material; the resistivity of the material was tested according to the current GB/T15662 standard and the data are shown in Table 2.
TABLE 2 Performance data for polypropylene composites based on discarded masks made in examples 1-3
As can be seen from Table 2, the cover body is used as the matrix of the composite material, the mixed sling is used as the toughening agent of the composite material, and the polypropylene composite material prepared by adding other processing aids can ensure that the composite material has good impact resistance and tensile strength without adding a beta nucleating agent and a compatilizer, thereby reducing the preparation cost of the polypropylene composite material. The mask body of the waste mask is made of non-woven fabric made of high-fluidity polypropylene resin, the hanging rope is made of polyurethane elastomer, the weight of the mask body of the common waste mask is about 5g, the weight of the hanging rope is about 0.3 g-0.5 g, and the weight of the mask body is larger for the N95 mask with better protective performance, so that the content of the polyurethane hanging rope in the mask body is basically below 10 wt%, and the embodiment proves that: when the content of the polyurethane hanging rope is below 10 wt%, the toughening effect on the polypropylene non-woven fabric cover body is very obvious, so that a compatilizer is not required to be additionally added to increase the cost.
The process of recycling the waste mask is very simple, the residual mask body and the hanging rope are uniformly made into fragments only by removing the nose bridge strip of the waste mask, and the mask body and the hanging rope do not need to be separated; the invention can obviously reduce the environmental pollution of the waste mask as medical waste; can reduce the energy consumption and pressure of the post-treatment of the medical waste, improve the recovery efficiency of raw materials and promote the cyclic utilization of resources.
The polypropylene composite material based on the waste mask prepared in the above embodiment was tested for antibacterial performance according to the current QB/T2591 standard, and the antibacterial rate of the polypropylene composite material to bacteria is shown in Table 3.
TABLE 3 antibacterial Properties of polypropylene composites based on discarded masks prepared in examples 1 to 3
Claims (9)
1. A recycling method of a waste mask is characterized by comprising the following steps:
(1) removing a nose bridge strip of the waste mask, making a mask body and a hanging rope of the waste mask into fragments to obtain mask fragments, and drying the mask fragments for later use; the mask body is made of non-woven fabric made of polypropylene resin, the melt index of the non-woven fabric is 40g/10 min-3000 g/10min, and the hanging rope is made of polyurethane elastomer;
(2) mixing the dried mask fragments with a coupling agent, a reinforcing agent, an antioxidant, a pigment and an antibacterial agent by using a mixing extruder, then extruding, and granulating to obtain a polypropylene composite material based on the waste mask;
the weight ratio of the mask fragments, the coupling agent, the reinforcing agent, the antioxidant, the pigment and the antibacterial agent in the polypropylene composite material is (70-80): 50-10): 5-10): 1-2): 5-10.
2. The recycling method of the discarded masks according to claim 1, characterized in that the internal mixing extruder comprises an internal mixing part and an extrusion part; the banburying rotation speed of the banburying part is 50 rpm-100 rpm, and the banburying processing temperature is 160 ℃ to 220 ℃; the feeding speed of the extrusion part is 20-50 rpm, the extrusion processing temperature is 160-220 ℃, and the screw rotating speed is 50-200 rpm.
3. The method for recycling a discarded mask according to any one of claims 1 to 2, wherein the coupling agent is one or more of KH-151, KH-550, KH-560 and KH-570.
4. The method for recycling the waste mask according to any one of claims 1 to 2, wherein the reinforcing agent is one or more of calcium carbonate, silica and talc.
5. The recycling method of the waste mask according to any one of claims 1 to 2, wherein the antioxidant is one or more of antioxidant 1010, antioxidant CA, antioxidant 145 and antioxidant 168.
6. The method for recycling the waste mask according to any one of claims 1 to 2, wherein the pigment is one or more of titanium white, iron yellow, iron red, iron blue, carbon black, iron black and phthalocyanine green.
7. The method for recycling the waste mask according to any one of claims 1 to 2, wherein the antibacterial agent is one or more of silver nitrate, zinc oxide, copper oxide, ammonium dihydrogen phosphate and silver carbonate.
8. The recycling method of the discarded masks according to any one of claims 1 to 2, wherein the polypropylene composite material further comprises an antistatic agent, and the weight ratio of the antistatic agent to the mask fragments is (3-5) to (70-80).
9. The method for recycling the waste mask according to any one of claims 1 to 2, wherein the antistatic agent is one or more of carbon black, carbon fiber, graphene, carbon nanotube, polypyrrole, polyaniline and MXene.
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| CN202010259654.1A CN111516183A (en) | 2020-04-03 | 2020-04-03 | Recycling method of waste mask |
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| CN202010259654.1A CN111516183A (en) | 2020-04-03 | 2020-04-03 | Recycling method of waste mask |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111959060A (en) * | 2020-08-17 | 2020-11-20 | 盐城工学院 | Composite material plate and preparation method thereof |
| CN112062990A (en) * | 2020-08-18 | 2020-12-11 | 浙江工业大学 | Process for preparing high-water-absorptivity wood-plastic composite film by using waste medical mask |
| CN113620277A (en) * | 2021-06-10 | 2021-11-09 | 北京化工大学 | Method for preparing carbon nano tube and hydrogen by high-valued utilization of waste medical masks |
| CN113771265A (en) * | 2021-09-06 | 2021-12-10 | 北京化工大学 | Waste disposable mask recovery process and separation tank device for separating mask fabric in process |
| CN114106460A (en) * | 2021-11-29 | 2022-03-01 | 江苏理工学院 | Method for preparing composite material with isolation function network structure after treatment of micro-plastics in wastewater |
| KR20220079488A (en) * | 2020-12-04 | 2022-06-13 | 김하늘 | Manufacturing method of upcycling furniture using waste mask |
| CN114747820A (en) * | 2021-01-08 | 2022-07-15 | 玛吉库珀有限公司 | Droplet-blocking mask |
| CN115316289A (en) * | 2022-08-10 | 2022-11-11 | 杭州野马医疗器械有限公司 | Dust-free bentonite composite cat litter and preparation method thereof |
| KR20230076145A (en) * | 2021-11-22 | 2023-05-31 | 한국에너지기술연구원 | A waste mask gasfication system |
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Application publication date: 20200811 |