CN107116772A - A kind of three-layer co-extruded preparation technique of plastic plate - Google Patents
A kind of three-layer co-extruded preparation technique of plastic plate Download PDFInfo
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- CN107116772A CN107116772A CN201710421859.3A CN201710421859A CN107116772A CN 107116772 A CN107116772 A CN 107116772A CN 201710421859 A CN201710421859 A CN 201710421859A CN 107116772 A CN107116772 A CN 107116772A
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- plastic plate
- preparation technique
- intermediate layer
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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
- B29C48/07—Flat, e.g. panels
-
- 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
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08L27/06—Homopolymers or copolymers of vinyl chloride
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/002—Panels; Plates; Sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/14—Applications used for foams
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention discloses a kind of three-layer co-extruded preparation technique of plastic plate, plastic plate includes upper surface layer, intermediate layer and undersurface layer, and intermediate layer is calculated in parts by weight to be made up of following material；50 60 parts of polyvinyl chloride, 30 40 parts of calcium carbonate, 0.5 part of foaming agent, 35 parts of stabilizer, 23 parts of lubricant, 36 parts of granular polystyrene, 48 parts of crushed crude pearlite, 10 13 parts of polyurethane, 25 parts of ammonium dihydrogen phosphate, 23 parts of auxiliary material, upper epidermis and layer are calculated be made up of following material in parts by weight：30 40 parts of heat-proof polythene, 30 35 parts of calcium carbonate, 5 parts of stabilizer, 3 parts of lubricant, 10 13 parts of rock wool powder, 46 parts of nano-zinc oxide powder, silver ion antimicrobial agent, 23 parts of mica powder, 35 parts of auxiliary material；Preparation process includes dispensing, batch mixing, heating material extrusion, cooling and shaping ejecting plate and plastic sheet surface is processed.The reasonable in design, production stage of the present invention is simple, and the plastic floor come out using this technique productions is completely embedded, service life length, flexible comfort are preferable.
Description
Technical field
The present invention relates to bottom plate production technology, specifically a kind of three-layer co-extruded preparation technique of plastic plate.
Background technology
Timber floor anti-flammability is poor, while the easy breed bacteria physical life of term bubble can also shorten, ceramic tile is heavier,
Fallen from above simultaneously in heavier and harder object and be easily caused base-plate breaking, plastic floor light weight, waterproof, convenient construction are
As the preferred finishing material of people, in the prior art most of technology productions using pressing, but the bottom plate after pressing is present
Connect not close between layers, while during pressing glue from overflowing can be caused, it is necessary to remove excessive glue, make production technology compared with
To be cumbersome, the floor quality produced is not high.
The content of the invention
It is disposable to complete modeling in order to solve the above problems the invention provides a kind of three-layer co-extruded production technology of plastic plate
The production of flitch.
The present invention is achieved through the following technical solutions in order to achieve the above object：
The present invention is a kind of three-layer co-extruded preparation technique of plastic plate, and plastic plate includes upper surface layer, intermediate layer and undersurface layer, in
Interbed is calculated in parts by weight to be made up of following material；It is 50-60 parts of polyvinyl chloride, 30-40 parts of calcium carbonate, 0.5 part of foaming agent, steady
Determine 3-5 parts of agent, 2-3 parts of lubricant, 3-6 parts of granular polystyrene, 4-8 parts of crushed crude pearlite, 10-13 parts of polyurethane, ammonium dihydrogen phosphate 2-5
Part, 2-3 parts of auxiliary material, upper epidermis and layer are calculated be made up of following material in parts by weight：30-40 parts of heat-proof polythene, carbon
Sour calcium 30-35 parts, 5 parts of stabilizer, 3 parts of lubricant, 10-13 parts of rock wool powder, 4-6 parts of nano-zinc oxide powder, silver-ion antibiotic
Agent, 2-3 parts of mica powder, 3-5 parts of auxiliary material；Preparation process is as follows：
（1）The material on the material in intermediate layer and upper and lower top layer is matched somebody with somebody separate after honest material and stirred to being well mixed；
（2）The mixing material of the mixing material in intermediate layer and upper and lower top layer is respectively put into the twin-screw that bore is 80 and 65 to squeeze
Go out and extrusion is heated in machine, extrusion temperature is 150-160 DEG C, extrusion is laggard to cross distributor distribution；
（3）Evenly distributed mixing material entered fish tail type and goes out the heated extrusion molding in board mold middle part；
（4）The plastic plate being extruded is directly entered in shaper, and water cooling is carried out in shaper, and mold clearing temperature is normal
Temperature, is cut after depanning according to size requirement；
（5）Plastic sheet surface after cutting is cleared up, plated film formation plated film is carried out to the plastic plate upper surface cleaned out
Layer, the thickness of film plating layer is 0.5-2 millimeters, and film plating layer is being etched to form anti-slip veins.
Further improvement of the present invention is：Auxiliary material includes fire retardant, plasticizer and age resister.
Further improvement of the present invention is：The rotating speed of double screw extruder in step 2 is 17r/min, and twin-screw is squeezed
Go out in machine to be divided into five heating zones, heating-up temperature gradually reduces by 5 DEG C from the firstth area to the 5th each area of area.
Further improvement of the present invention is：Mixing material goes out board mold middle part from fish tail type and entered, and fish tail type goes out
Middle part temperature is 170 DEG C in board mold, and both sides temperature is 200 DEG C.
Further improvement of the present invention is：Shaper in step 4, which is divided between three sections, every two section, has 10 centimetres
Space, the gap between the mold often saved and lower mould is gradually reduced.
Further improvement of the present invention is：Upper epidermis and the thickness of layer are 2 centimetres, and intermediate layer thickness is 3-4 lis
Rice.
The beneficial effects of the invention are as follows：Bore is carried out after Hybrid Heating for 80 double screw extruder to the material in intermediate layer
Squeeze into distributor, bore to upper epidermis and the material of layer squeeze into after Hybrid Heating point for 65 double screw extruder
In orchestration, board mold formation three-layer plastic plate is gone out into fish tail type after distributor is distributed, fixed by shaper cooling
The plastic plate of finished product is formed after type, one-shot forming need not be pressed, and three layers of one-shot forming are completely embedded.
The present invention is reasonable in design, production stage is simple, and the plastic floor come out using this technique productions is completely embedded, used
Long lifespan, flexible comfort are preferable.
Embodiment
In order to strengthen the understanding of the present invention, below the present invention is described in further detail, the embodiment is only used
In explaining the present invention, protection scope of the present invention is not constituted and limited.
The present invention is a kind of three-layer co-extruded preparation technique of plastic plate, and plastic plate includes upper surface layer, intermediate layer and lower surface
Layer, intermediate layer is calculated in parts by weight to be made up of following material；50-60 parts of polyvinyl chloride, 30-40 parts of calcium carbonate, foaming agent 0.5
Part, 3-5 parts of stabilizer, 2-3 parts of lubricant, 3-6 parts of granular polystyrene, 4-8 parts of crushed crude pearlite, 10-13 parts of polyurethane, biphosphate
2-5 parts of ammonium, 2-3 parts of auxiliary material, upper epidermis and layer are calculated be made up of following material in parts by weight：Heat-proof polythene 30-40
Part, 30-35 parts of calcium carbonate, 5 parts of stabilizer, 3 parts of lubricant, 10-13 parts of rock wool powder, 4-6 parts of nano-zinc oxide powder, silver ion
Antiseptic, 2-3 parts of mica powder, 3-5 parts of auxiliary material；Preparation process is as follows：
（1）The material on the material in intermediate layer and upper and lower top layer is matched somebody with somebody separate after honest material and stirred to being well mixed；
（2）The mixing material of the mixing material in intermediate layer and upper and lower top layer is respectively put into the twin-screw that bore is 80 and 65 to squeeze
Go out and extrusion is heated in machine, extrusion temperature is 150-160 DEG C, extrusion is laggard to cross distributor distribution；
（3）Evenly distributed mixing material entered fish tail type and goes out the heated extrusion molding in board mold middle part；
（4）The plastic plate being extruded is directly entered in shaper, and water cooling is carried out in shaper, and mold clearing temperature is normal
Temperature, is cut after depanning according to size requirement；
（5）Plastic sheet surface after cutting is cleared up, plated film formation plated film is carried out to the plastic plate upper surface cleaned out
Layer, the thickness of film plating layer is 0.5-2 millimeters, and film plating layer is being etched to form anti-slip veins；Upper and lower surface is closely knit
Property plate, intermediate layer is foamed board, is respectively provided with antibiotic property on upper and lower surface and intermediate layer, and foamed board can make plastic plate have one
The comfort level of fixed elasticity increase plastic plate, upper and lower surface, which employs heat-proof polythene, makes upper surface locate in a short time
In that will not be deformed at 80 DEG C, while being mixed with fire proofing on upper and lower surface and intermediate layer, it can prevent plastic floor from burning,
The rotating speed of double screw extruder in step 2 is to be divided into five heating zones, heating-up temperature in 17r/min, double screw extruder
5 DEG C are gradually reduced from the firstth area to the 5th each area of area, compound is 1.5-2 minutes from the firstth area to discharging time, it can be ensured that
Compound is heated fully, and the end of double screw extruder is connected by connector with distributor, the temperature of connector during discharging
For 150 DEG C, compound is set to be not less than 150 DEG C in the temperature being squeezed into distributor, mixing material is from fish tail type goes out board mold
Between position enter, it is 170 DEG C that fish tail type, which goes out in board mold middle part temperature, and both sides temperature is 200 DEG C, and fish tail type goes out board mold
7 heating zones are inside provided with, middle Heating Zone Temperature is 170 DEG C, and temperature gradually increases by 5 DEG C to both sides from middle heating zone, really
The compound that guarantor's fish tail type goes out in board mold can be heated fully.
The present invention is reasonable in design, production stage is simple, and the plastic floor come out using this technique productions is completely embedded, used
Long lifespan, flexible comfort are preferable.
Claims (6)
1. a kind of three-layer co-extruded preparation technique of plastic plate, plastic plate includes upper surface layer, intermediate layer and undersurface layer, intermediate layer is pressed
It is made up of according to listed as parts by weight following material；50-60 parts of polyvinyl chloride, 30-40 parts of calcium carbonate, 0.5 part of foaming agent, stabilizer 3-
5 parts, 2-3 parts of lubricant, 3-6 parts of granular polystyrene, 4-8 parts of crushed crude pearlite, it is 10-13 parts of polyurethane, 2-5 parts of ammonium dihydrogen phosphate, auxiliary
2-3 parts of material, upper epidermis and layer are calculated be made up of following material in parts by weight：30-40 parts of heat-proof polythene, calcium carbonate
30-35 parts, 5 parts of stabilizer, 3 parts of lubricant, 10-13 parts of rock wool powder, 4-6 parts of nano-zinc oxide powder, silver ion antimicrobial agent, cloud
2-3 parts of female powder, 3-5 parts of auxiliary material；Preparation process is as follows：
（1）The material on the material in intermediate layer and upper and lower top layer is matched somebody with somebody separate after honest material and stirred to being well mixed；
The mixing material of the mixing material in intermediate layer and upper and lower top layer is respectively put into the twin-screw extrusion that bore is 80 and 65
Extrusion is heated in machine, extrusion temperature is 150-160 DEG C, extrusion is laggard to cross distributor distribution；
Evenly distributed mixing material entered fish tail type and goes out the heated extrusion molding in board mold middle part；
The plastic plate being extruded is directly entered in shaper, and water cooling is carried out in shaper, and mold clearing temperature is normal temperature, is gone out
Cut after mould according to size requirement；
Plastic sheet surface after cutting is cleared up, plated film formation film plating layer is carried out to the plastic plate upper surface cleaned out,
The thickness of film plating layer is 0.5-2 millimeters, and film plating layer is being etched to form anti-slip veins.
2. the three-layer co-extruded preparation technique of a kind of plastic plate according to claim 1, it is characterised in that：The auxiliary material includes fire-retardant
Agent, plasticizer and age resister.
3. the three-layer co-extruded preparation technique of a kind of plastic plate according to claim 1, it is characterised in that：Twin-screw in step 2
The rotating speed of extruder is to be divided into five heating zones in 17r/min, double screw extruder, and heating-up temperature is from the firstth area to the 5th area
Each area gradually reduces by 5 DEG C.
4. the three-layer co-extruded preparation technique of a kind of plastic plate according to claim 1, it is characterised in that：Mixing material is from fish tail type
Go out the entrance of board mold middle part, it is 170 DEG C that fish tail type, which goes out middle part temperature in board mold, both sides temperature is 200 DEG C.
5. the three-layer co-extruded preparation technique of a kind of plastic plate according to claim 1, it is characterised in that：Stock mould in step 4
Tool is divided into the space between three sections, every two section with 10 centimetres, and the gap between the mold often saved and lower mould is gradually reduced.
6. the three-layer co-extruded preparation technique of a kind of plastic plate according to claim 1, it is characterised in that：The upper epidermis and following table
The thickness of layer is 2 centimetres, and intermediate layer thickness is 3-4 centimetres.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710421859.3A CN107116772B (en) | 2017-06-07 | 2017-06-07 | A kind of three-layer co-extruded preparation technique of plastic plate |
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|---|---|---|---|
| CN201710421859.3A CN107116772B (en) | 2017-06-07 | 2017-06-07 | A kind of three-layer co-extruded preparation technique of plastic plate |
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| CN107116772A true CN107116772A (en) | 2017-09-01 |
| CN107116772B CN107116772B (en) | 2019-05-24 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108384138A (en) * | 2018-02-09 | 2018-08-10 | 尹显东 | A kind of radiation protection composite board material and preparation method thereof for interior decoration |
| CN109719920A (en) * | 2019-03-15 | 2019-05-07 | 张家港市弘扬石化设备有限公司 | A2 or B1 grades of fire-proof plate production mixing extrusion system and mixing extrusion method |
| CN110126228A (en) * | 2019-05-23 | 2019-08-16 | 安徽爱瑞特思新材料有限公司 | Mould the manufacturing method of plank |
| CN112373078A (en) * | 2020-11-12 | 2021-02-19 | 安徽韩华建材科技股份有限公司 | Processing method of composite plastic floor |
| CN114393859A (en) * | 2022-01-20 | 2022-04-26 | 山西实鼎科技发展有限公司 | Preparation method of high-molecular modified plastic plate |
| US11515198B2 (en) | 2017-05-18 | 2022-11-29 | Micron Technology, Inc. | Semiconductor constructions comprising dielectric material, and methods of forming dielectric fill within openings extending into semiconductor constructions |
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| CN101718143A (en) * | 2009-12-02 | 2010-06-02 | 安徽省实防新型玻璃科技有限公司 | Glass floor |
| CN101722643A (en) * | 2009-12-21 | 2010-06-09 | 靳培军 | Method for manufacturing one-step formed composite foamed plastic formwork |
| US20120012245A1 (en) * | 2010-07-13 | 2012-01-19 | Dictus Josephus Theodorus Petrus | Production method for a panel |
| CN105860318A (en) * | 2015-12-22 | 2016-08-17 | 北京化工大学 | A co-extruded double-foaming polymer composite material floor and a processing method thereof |
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2017
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101718143A (en) * | 2009-12-02 | 2010-06-02 | 安徽省实防新型玻璃科技有限公司 | Glass floor |
| CN101722643A (en) * | 2009-12-21 | 2010-06-09 | 靳培军 | Method for manufacturing one-step formed composite foamed plastic formwork |
| US20120012245A1 (en) * | 2010-07-13 | 2012-01-19 | Dictus Josephus Theodorus Petrus | Production method for a panel |
| CN105860318A (en) * | 2015-12-22 | 2016-08-17 | 北京化工大学 | A co-extruded double-foaming polymer composite material floor and a processing method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11515198B2 (en) | 2017-05-18 | 2022-11-29 | Micron Technology, Inc. | Semiconductor constructions comprising dielectric material, and methods of forming dielectric fill within openings extending into semiconductor constructions |
| CN108384138A (en) * | 2018-02-09 | 2018-08-10 | 尹显东 | A kind of radiation protection composite board material and preparation method thereof for interior decoration |
| CN109719920A (en) * | 2019-03-15 | 2019-05-07 | 张家港市弘扬石化设备有限公司 | A2 or B1 grades of fire-proof plate production mixing extrusion system and mixing extrusion method |
| CN110126228A (en) * | 2019-05-23 | 2019-08-16 | 安徽爱瑞特思新材料有限公司 | Mould the manufacturing method of plank |
| CN112373078A (en) * | 2020-11-12 | 2021-02-19 | 安徽韩华建材科技股份有限公司 | Processing method of composite plastic floor |
| CN114393859A (en) * | 2022-01-20 | 2022-04-26 | 山西实鼎科技发展有限公司 | Preparation method of high-molecular modified plastic plate |
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| CN107116772B (en) | 2019-05-24 |
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