CN111961291A - Cold-resistant PVC sound insulation material and manufacturing method thereof - Google Patents
Cold-resistant PVC sound insulation material and manufacturing method thereof Download PDFInfo
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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
- 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
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- 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
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- C08K3/02—Elements
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- C08K2003/0856—Iron
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- 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
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- 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
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- C08K2003/2213—Oxides; Hydroxides of metals of rare earth metal of cerium
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- C—CHEMISTRY; METALLURGY
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- 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
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- 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
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Abstract
The invention discloses a cold-resistant PVC sound insulation material and a manufacturing method thereof, wherein the cold-resistant PVC sound insulation material comprises the following components in percentage by mass: 24-28 parts of PVC resin powder, 14-18 parts of plasticizer, 44-48 parts of filler, 6-10 parts of polyalcohol antifreezing agent, 1-3 parts of calcium-zinc stabilizer and 1-3 parts of film-forming additive, wherein the polyalcohol antifreezing agent is polyalcohol antifreezing agent with the specific weight of 1.05-1.1; the content of PVC molecules in the sound insulation material can be improved by controlling the content of PVC resin powder, the polyvinyl alcohol antifreezing agent in the components can keep PVC to keep molecular activity continuously when the environment is below zero, meanwhile, the polyvinyl alcohol antifreezing agent with the specific gravity of 1.05-1.1 can be fully fused with other materials in the PVC sound insulation material, the prepared PVC sound insulation material can be suitable for extremely cold environment with the temperature of above 40 ℃ below zero, and the internal structure is stable and can keep better physical properties.
Description
Technical Field
The invention relates to the field of PVC sound insulation materials, in particular to a cold-resistant PVC sound insulation material and a manufacturing method thereof.
Background
The cold resistance of the PVC sound insulation material for the sound insulation and heat insulation of the air conditioner in the market at present is below 8 ℃, the sound insulation material is hardened when the temperature exceeds 8 ℃, a sound insulation layer is broken in the working vibration process of a compressor to cause sound insulation failure, under the global environment protection action, the action of burning wood carbon or coal for heating is taken successively in colder places to advocate the use of electric energy of enterprises and families, wherein the air conditioner is also promoted for heating, under the large environment, the air conditioner is in operation under the working cold environment, the sound insulation and noise reduction of an air conditioner outdoor unit compressor need to adapt to the sound insulation material under the cold environment, the existing PVC sound insulation material cannot meet the use under the extremely cold environment, the phenomena of hardening and breaking can occur under the extremely cold environment, and the sound insulation effect also has defects, therefore, the invention provides the cold-resistant PVC sound insulation material and the manufacturing method thereof, to solve the disadvantages in the prior art.
Disclosure of Invention
Aiming at the problems, the invention provides a cold-resistant PVC sound insulation material and a manufacturing method thereof, wherein the polyvinyl alcohol antifreezing agent in the components can keep PVC to keep the molecular activity continuously when the PVC is kept below zero, meanwhile, the polyvinyl alcohol antifreezing agent with the specific gravity of 1.05-1.1 can be fully fused with other materials in the PVC sound insulation material, the manufactured PVC sound insulation material can be suitable for extremely cold environment with the temperature of above 40 ℃ below zero, and the internal structure is stable and can keep better physical properties.
The invention provides a cold-resistant PVC sound insulation material which comprises the following components in percentage by mass: 24-28 parts of PVC resin powder, 14-18 parts of plasticizer, 44-48 parts of filler, 6-10 parts of polyalcohol antifreezing agent, 1-3 parts of calcium-zinc stabilizer and 1-3 parts of film-forming assistant.
The further improvement lies in that: comprises the following components in percentage by mass: 26 parts of PVC resin powder, 16 parts of plasticizer, 46 parts of filler, 8 parts of polyalcohol antifreezing agent, 2 parts of calcium-zinc stabilizer and 2 parts of film-forming assistant.
The further improvement lies in that: the polyalcohol antifreezing agent is a polyalcohol antifreezing agent with the specific weight of 1.05-1.1.
The further improvement lies in that: the filler is one or a mixture of iron powder, calcium carbonate, mica powder, barium sulfate, barium titanate, cerium oxide, lanthanum oxide or steel slag.
A method for manufacturing a cold-resistant PVC sound insulation material comprises the following steps:
the method comprises the following steps: mixing, namely adding PVC resin powder, a plasticizer, a filler, a polyalcohol antifreezing agent, a calcium-zinc stabilizer and a film-forming additive into a stirring kettle, and mixing and stirring to prepare a mixture material;
step two: banburying, namely adding the mixture prepared in the step one into a banbury mixer to perform first-stage mixing and second-stage mixing to obtain a mixed material;
step three: extruding, namely adding the mixed material obtained in the second step into a double-screw extruder, and extruding and granulating to obtain master batches;
step four: adding the master batch obtained in the third step into a single-screw extruder for melting and plasticizing, and then adding the master batch into a three-roller calender for calendering and molding to obtain the PVC sound insulation material;
step five: and cooling the formed PVC sound insulation material to room temperature, and then cutting the pieces.
The further improvement lies in that: in the first step, the PVC resin powder, the plasticizer and the filler are firstly added into a stirring kettle to be mixed and stirred for 20-30min, the stirring speed in the stirring kettle is controlled to be 300-plus-400 r/min, then the polyalcohol type antifreezing agent and the calcium-zinc stabilizer are added into the stirring kettle to be mixed and stirred for 5-10min, finally the film-forming auxiliary agent is added into the stirring kettle to be mixed and stirred for 15-18min, and the stirring speed in the stirring kettle is controlled to be 460-plus-500 r/min.
The further improvement lies in that: and in the second step, during the first-stage mixing, the mixed materials are added into a mixer, the temperature in the mixer is controlled to be 150 ℃ plus materials, the first-stage mixing time is 20-30min, the mixed materials are cooled for 20-30min after the first-stage mixing, and then the second-stage mixing is carried out, during the second-stage mixing, the temperature in the mixer is controlled to be 110 ℃ plus materials, the mixed materials are equally divided into 4-5 times and added into the mixer, and the mixing needs to be carried out for 5-7min every time the mixed materials are added.
The further improvement lies in that: the temperature of each section of the double-screw extruder in the third step is 130-.
The further improvement lies in that: the temperature of each section of the single-screw extruder in the fourth step is 110-.
The invention has the beneficial effects that: the PVC molecular content in the sound insulation material can be improved by controlling the content of PVC resin powder, the polyvinyl chloride (PVC) can keep molecular activity continuously when the PVC is kept below zero in the environment through the polyalcohol type antifreezing agent in the composition, meanwhile, the polyalcohol type antifreezing agent with the specific gravity of 1.05-1.1 can be fully fused with other materials in the PVC sound insulation material, the mixing uniformity during banburying can be kept, the calcium-zinc stabilizer in the composition can keep the internal structure of the PVC sound insulation material stable in a cold environment and keep better physical characteristics, the PVC sound insulation material can be suitable for an extremely cold environment with the temperature of above 40 ℃ below zero, conditions can be provided for normal work of cooling and heating equipment such as an air conditioner and the like in the extremely cold environment, conditions can be provided for normal use of the air conditioner under the extremely cold condition of the day air, people living and working in the extremely cold environment can enjoy the convenience of the air conditioner, and carbon emission can be reduced at the same time, the environment can be protected.
Detailed Description
In order to enhance the understanding of the present invention, the present invention will be further described with reference to the following examples, which are only illustrative and not intended to limit the scope of the present invention.
Example one
The cold-resistant PVC sound insulation material comprises the following components in percentage by mass: 24 parts of PVC resin powder, 14 parts of plasticizer, 44 parts of filler, 6 parts of polyalcohol antifreezing agent, 1 part of calcium-zinc stabilizer and 1 part of film-forming assistant.
The polyalcohol antifreezing agent is a polyalcohol antifreezing agent with the specific gravity of 1.08.
The filler is one or a mixture of iron powder, calcium carbonate, mica powder, barium sulfate, barium titanate, cerium oxide, lanthanum oxide or steel slag.
A method for manufacturing a cold-resistant PVC sound insulation material comprises the following steps:
the method comprises the following steps: mixing, namely adding PVC resin powder, a plasticizer and a filler into a stirring kettle, mixing and stirring for 25min, controlling the stirring speed in the stirring kettle to be 350r/min, adding a polyalcohol anti-freezing agent and a calcium-zinc stabilizer into the stirring kettle, mixing and stirring for 8min, finally adding a film-forming auxiliary agent into the stirring kettle, mixing and stirring for 16min, and controlling the stirring speed in the stirring kettle to be 480r/min to prepare a mixed material;
step two: banburying, the mixture prepared in the first step is added into a banbury mixer to carry out first-stage mixing and second-stage mixing, during the first-stage mixing, the mixed material is added into the banbury mixer, the temperature in the banbury mixer is controlled at 135 ℃, the first-stage mixing time is 25min, after the first-stage mixing, the mixed material is cooled for 25min and then is subjected to second-stage mixing, during the second-stage mixing, the temperature in the banbury mixer is controlled at 108 ℃, the mixed material is equally divided into 5 times and is added into the banbury mixer, and the mixing needs to be carried out for 6min every time the mixed material is added, so;
step three: extruding, namely adding the mixed material obtained in the second step into a double-screw extruder, controlling the temperature of each section of the double-screw extruder to be 135 ℃, 1405 ℃, 150 ℃ and 160 ℃ and the rotating speed of a screw to be 50r/min, and extruding and granulating to obtain master batches;
step four: adding the master batch obtained in the third step into a single-screw extruder for melting and plasticizing, wherein the temperature of each section of the single-screw extruder is 115 ℃, 132 ℃, 145 ℃ and 155 ℃, and the screw rotating speed is 55r/min, then adding the master batch into a three-roll calender for calendering and molding, and the temperature of the three-roll calender is 75 ℃ to obtain the PVC sound insulation material;
step five: and cooling the formed PVC sound insulation material to room temperature, and then cutting the pieces.
Example two
The cold-resistant PVC sound insulation material comprises the following components in percentage by mass: 26 parts of PVC resin powder, 16 parts of plasticizer, 46 parts of filler, 8 parts of polyalcohol antifreezing agent, 2 parts of calcium-zinc stabilizer and 2 parts of film-forming assistant.
The polyalcohol antifreezing agent is a polyalcohol antifreezing agent with the specific gravity of 1.08.
The filler is one or a mixture of iron powder, calcium carbonate, mica powder, barium sulfate, barium titanate, cerium oxide, lanthanum oxide or steel slag.
A method for manufacturing a cold-resistant PVC sound insulation material comprises the following steps:
the method comprises the following steps: mixing, namely adding PVC resin powder, a plasticizer and a filler into a stirring kettle, mixing and stirring for 25min, controlling the stirring speed in the stirring kettle to be 350r/min, adding a polyalcohol anti-freezing agent and a calcium-zinc stabilizer into the stirring kettle, mixing and stirring for 8min, finally adding a film-forming auxiliary agent into the stirring kettle, mixing and stirring for 16min, and controlling the stirring speed in the stirring kettle to be 480r/min to prepare a mixed material;
step two: banburying, the mixture prepared in the first step is added into a banbury mixer to carry out first-stage mixing and second-stage mixing, during the first-stage mixing, the mixed material is added into the banbury mixer, the temperature in the banbury mixer is controlled at 135 ℃, the first-stage mixing time is 25min, after the first-stage mixing, the mixed material is cooled for 25min and then is subjected to second-stage mixing, during the second-stage mixing, the temperature in the banbury mixer is controlled at 108 ℃, the mixed material is equally divided into 5 times and is added into the banbury mixer, and the mixing needs to be carried out for 6min every time the mixed material is added, so;
step three: extruding, namely adding the mixed material obtained in the second step into a double-screw extruder, controlling the temperature of each section of the double-screw extruder to be 135 ℃, 1405 ℃, 150 ℃ and 160 ℃ and the rotating speed of a screw to be 50r/min, and extruding and granulating to obtain master batches;
step four: adding the master batch obtained in the third step into a single-screw extruder for melting and plasticizing, wherein the temperature of each section of the single-screw extruder is 115 ℃, 132 ℃, 145 ℃ and 155 ℃, and the screw rotating speed is 55r/min, then adding the master batch into a three-roll calender for calendering and molding, and the temperature of the three-roll calender is 75 ℃ to obtain the PVC sound insulation material;
step five: and cooling the formed PVC sound insulation material to room temperature, and then cutting the pieces.
EXAMPLE III
The cold-resistant PVC sound insulation material comprises the following components in percentage by mass: 28 parts of PVC resin powder, 18 parts of plasticizer, 48 parts of filler, 10 parts of polyalcohol antifreezing agent, 3 parts of calcium-zinc stabilizer and 3 parts of film-forming assistant.
The polyalcohol antifreezing agent is a polyalcohol antifreezing agent with the specific gravity of 1.08.
The filler is one or a mixture of iron powder, calcium carbonate, mica powder, barium sulfate, barium titanate, cerium oxide, lanthanum oxide or steel slag.
A method for manufacturing a cold-resistant PVC sound insulation material comprises the following steps:
the method comprises the following steps: mixing, namely adding PVC resin powder, a plasticizer and a filler into a stirring kettle, mixing and stirring for 25min, controlling the stirring speed in the stirring kettle to be 350r/min, adding a polyalcohol anti-freezing agent and a calcium-zinc stabilizer into the stirring kettle, mixing and stirring for 8min, finally adding a film-forming auxiliary agent into the stirring kettle, mixing and stirring for 16min, and controlling the stirring speed in the stirring kettle to be 480r/min to prepare a mixed material;
step two: banburying, the mixture prepared in the first step is added into a banbury mixer to carry out first-stage mixing and second-stage mixing, during the first-stage mixing, the mixed material is added into the banbury mixer, the temperature in the banbury mixer is controlled at 135 ℃, the first-stage mixing time is 25min, after the first-stage mixing, the mixed material is cooled for 25min and then is subjected to second-stage mixing, during the second-stage mixing, the temperature in the banbury mixer is controlled at 108 ℃, the mixed material is equally divided into 5 times and is added into the banbury mixer, and the mixing needs to be carried out for 6min every time the mixed material is added, so;
step three: extruding, namely adding the mixed material obtained in the second step into a double-screw extruder, controlling the temperature of each section of the double-screw extruder to be 135 ℃, 1405 ℃, 150 ℃ and 160 ℃ and the rotating speed of a screw to be 50r/min, and extruding and granulating to obtain master batches;
step four: adding the master batch obtained in the third step into a single-screw extruder for melting and plasticizing, wherein the temperature of each section of the single-screw extruder is 115 ℃, 132 ℃, 145 ℃ and 155 ℃, and the screw rotating speed is 55r/min, then adding the master batch into a three-roll calender for calendering and molding, and the temperature of the three-roll calender is 75 ℃ to obtain the PVC sound insulation material;
step five: and cooling the formed PVC sound insulation material to room temperature, and then cutting the pieces.
According to the first embodiment, the second embodiment and the third embodiment, the invention can be obtained by the following components in percentage by mass: the PVC sound insulation material prepared from 24-28 parts of PVC resin powder, 14-18 parts of plasticizer, 44-48 parts of filler, 6-10 parts of polyalcohol antifreezing agent, 1-3 parts of calcium-zinc stabilizer and 1-3 parts of film forming additive has the best antifreezing and sound insulation effects, can keep the internal structure of the PVC sound insulation material stable in a cold environment, and is suitable for an extremely cold environment with the temperature of above 40 ℃ below zero.
The invention has the beneficial effects that: the PVC molecular content in the sound insulation material can be improved by controlling the content of PVC resin powder, the polyvinyl chloride (PVC) can keep molecular activity continuously when the PVC is kept below zero in the environment through the polyalcohol type antifreezing agent in the composition, meanwhile, the polyalcohol type antifreezing agent with the specific gravity of 1.05-1.1 can be fully fused with other materials in the PVC sound insulation material, the mixing uniformity during banburying can be kept, the calcium-zinc stabilizer in the composition can keep the internal structure of the PVC sound insulation material stable in a cold environment and keep better physical characteristics, the PVC sound insulation material can be suitable for an extremely cold environment with the temperature of above 40 ℃ below zero, conditions can be provided for normal work of cooling and heating equipment such as an air conditioner and the like in the extremely cold environment, conditions can be provided for normal use of the air conditioner under the extremely cold condition of the day air, people living and working in the extremely cold environment can enjoy the convenience of the air conditioner, and carbon emission can be reduced at the same time, the environment can be protected.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention as defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. The cold-resistant PVC sound insulation material is characterized by comprising the following components in percentage by mass: 24-28 parts of PVC resin powder, 14-18 parts of plasticizer, 44-48 parts of filler, 6-10 parts of polyalcohol antifreezing agent, 1-3 parts of calcium-zinc stabilizer and 1-3 parts of film-forming assistant.
2. The cold-resistant PVC soundproof material of claim 1, wherein: comprises the following components in percentage by mass: 26 parts of PVC resin powder, 16 parts of plasticizer, 46 parts of filler, 8 parts of polyalcohol antifreezing agent, 2 parts of calcium-zinc stabilizer and 2 parts of film-forming assistant.
3. The cold-resistant PVC soundproof material of claim 1, wherein: the polyalcohol antifreezing agent is a polyalcohol antifreezing agent with the specific weight of 1.05-1.1.
4. The cold-resistant PVC soundproof material of claim 1, wherein: the filler is one or a mixture of iron powder, calcium carbonate, mica powder, barium sulfate, barium titanate, cerium oxide, lanthanum oxide or steel slag.
5. The manufacturing method of the cold-resistant PVC sound insulation material is characterized by comprising the following steps:
the method comprises the following steps: mixing, namely adding PVC resin powder, a plasticizer, a filler, a polyalcohol antifreezing agent, a calcium-zinc stabilizer and a film-forming additive into a stirring kettle, and mixing and stirring to prepare a mixed material;
step two: banburying, namely adding the mixture prepared in the step one into a banbury mixer to perform first-stage mixing and second-stage mixing to obtain a mixed material;
step three: extruding, namely adding the mixed material obtained in the second step into a double-screw extruder, and extruding and granulating to obtain master batches;
step four: adding the master batch obtained in the third step into a single-screw extruder for melting and plasticizing, and then adding the master batch into a three-roller calender for calendering and molding to obtain a PVC sound insulation material;
step five: and cooling the formed PVC sound insulation material to room temperature, and then cutting the piece.
6. The method for manufacturing the cold-resistant PVC soundproof material as claimed in claim 5, wherein the method comprises the following steps: in the first step, the PVC resin powder, the plasticizer and the filler are firstly added into a stirring kettle to be mixed and stirred for 20-30min, the stirring speed in the stirring kettle is controlled to be 300-one 400r/min, then the polyalcohol type antifreezing agent and the calcium-zinc stabilizer are added into the stirring kettle to be mixed and stirred for 5-10min, finally the film-forming auxiliary agent is added into the stirring kettle to be mixed and stirred for 15-18min, and the stirring speed in the stirring kettle is controlled to be 460-one 500 r/min.
7. The method for manufacturing the cold-resistant PVC soundproof material as claimed in claim 5, wherein the method comprises the following steps: and in the second step, during the first-stage mixing, the mixed materials are added into an internal mixer, the temperature in the internal mixer is controlled to be 150-.
8. The method for manufacturing the cold-resistant PVC soundproof material as claimed in claim 5, wherein the method comprises the following steps: the temperature of each section of the double-screw extruder in the third step is 130-.
9. The method for manufacturing the cold-resistant PVC soundproof material as claimed in claim 5, wherein the method comprises the following steps: the temperature of each section of the single-screw extruder in the fourth step is 110-.
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| CN201910417737.6A CN111961291A (en) | 2019-05-20 | 2019-05-20 | Cold-resistant PVC sound insulation material and manufacturing method thereof |
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| CN201910417737.6A CN111961291A (en) | 2019-05-20 | 2019-05-20 | Cold-resistant PVC sound insulation material and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114773752A (en) * | 2022-05-31 | 2022-07-22 | 安徽工业大学 | Steel slag PVC (polyvinyl chloride) calendered film matrix material and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0251645A2 (en) * | 1986-06-23 | 1988-01-07 | NIPPON MINING & METALS COMPANY, LIMITED | Low-smoke noise insulating material |
| CN104629217A (en) * | 2015-02-14 | 2015-05-20 | 青岛科技大学 | Sound insulating material and preparation method thereof |
| CN105367935A (en) * | 2015-11-03 | 2016-03-02 | 南京协和助剂有限公司 | Anti-freezing impact-resisting PVC pipe |
-
2019
- 2019-05-20 CN CN201910417737.6A patent/CN111961291A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0251645A2 (en) * | 1986-06-23 | 1988-01-07 | NIPPON MINING & METALS COMPANY, LIMITED | Low-smoke noise insulating material |
| CN104629217A (en) * | 2015-02-14 | 2015-05-20 | 青岛科技大学 | Sound insulating material and preparation method thereof |
| CN105367935A (en) * | 2015-11-03 | 2016-03-02 | 南京协和助剂有限公司 | Anti-freezing impact-resisting PVC pipe |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114773752A (en) * | 2022-05-31 | 2022-07-22 | 安徽工业大学 | Steel slag PVC (polyvinyl chloride) calendered film matrix material and preparation method thereof |
| CN114773752B (en) * | 2022-05-31 | 2023-04-28 | 安徽工业大学 | Steel slag PVC (polyvinyl chloride) calendered film base material and preparation method thereof |
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Application publication date: 20201120 |