CN108976659A - A kind of flame retardant type Double-wall PVC pipe and preparation method thereof - Google Patents
A kind of flame retardant type Double-wall PVC pipe and preparation method thereof Download PDFInfo
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- CN108976659A CN108976659A CN201810678905.2A CN201810678905A CN108976659A CN 108976659 A CN108976659 A CN 108976659A CN 201810678905 A CN201810678905 A CN 201810678905A CN 108976659 A CN108976659 A CN 108976659A
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- mass parts
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- pvc pipe
- flame retardant
- type double
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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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/133—Rigid pipes of plastics with or without reinforcement the walls consisting of two 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
- 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
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- 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
- C08L2203/18—Applications used for pipes
-
- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The present invention relates to a kind of flame retardant type Double-wall PVC pipe, tube wall is made of double-layer structure, and wherein internal layer raw material forms are as follows: polyvinyl chloride, chliorinated polyvinyl chloride, polymethyl methacrylate, aluminium hydroxide, polypropylene carbonate, plasticizer, precipitated calcium carbonate；Outer layer raw material composition are as follows: polyvinyl chloride, poly- 1- butyl ester, Methacrylate-butadiene-styrene, Sodium Polyacrylate, aluminium hydroxide, polypropylene carbonate, polyethylene-acrylate rubber, aromatic copolycarbonate, plasticizer etc..Material fire-retardant and resistant to high temperature is added in layer materials of the present invention.Wherein polypropylene carbonate can be generated great amount of carbon dioxide by thermal decomposition under burning condition and be achieved the purpose that fire-retardant to dilute periphery oxygen concentration；Sodium Polyacrylate can play moisture absorption and moisture-keeping function, to add somewhat to the humidity of pvc pipe periphery subenvironment, reduce temperature, improve the temperature tolerance and anti-flammability of pvc pipe.
Description
Technical field
The present invention relates to pvc pipe fields more particularly to a kind of flame retardant type Double-wall PVC pipe and preparation method thereof.
Background technique
PVC(Polyvinylchlorid) pipe is a kind of tubing as the main component with polyvinyl chloride.Double-wall PVC pipe at present
It is that domestic development more quickly save low raw material, project cost, easy for construction, inner wall smooth and rub by a kind of product, the product
The resistance small flow of coefficient is big, use scope is wide.Double-wall PVC pipe anti-flammability is poor at present, so that it is wider to hinder Double-wall PVC pipe
It uses, usually used fire retardant contains halogen or phosphorus.Flame retardant effect containing halogen or phosphorus is obvious but to environmental hazard
Also bigger, such as halogen fire proofing generates dioxin in burning, can exist for many years in the environment, or even accumulate on life all the life
Object；Phosphorus will lead to the eutrophication of water quality, serious polluted source.Therefore provide it is a kind of have good flame-retardance, high temperature resistant and
The Double-wall PVC pipe of environmental protection is problem to be solved by this invention.
Summary of the invention
The present invention overcomes the deficiencies in the prior art, provide a kind of with good flame-retardance, high temperature resistant and the PVC of environmental protection
Double-wall pipe.
In order to achieve the above objectives, the technical solution adopted by the present invention are as follows: a kind of flame retardant type Double-wall PVC pipe is provided, it is special
Sign is: tube wall is made of double-layer structure, including internal layer and outer layer；The internal layer raw material composition are as follows: 100 mass of polyvinyl chloride
Part, is gathered at chliorinated polyvinyl chloride 60-80 mass parts, polymethyl methacrylate 15-30 mass parts, aluminium hydroxide 5-10 mass parts
Propene carbonate 5-20 mass parts, plasticizer 10-15 mass parts, precipitated calcium carbonate 8-22 mass parts；Outer layer raw material composition are as follows: poly-
100 mass parts of vinyl chloride, poly- 1- butyl ester 50-70 mass parts, Methacrylate-butadiene-styrene 10-25 mass
Part, Sodium Polyacrylate 10-20 mass parts, aluminium hydroxide 5-10 mass parts, polypropylene carbonate 12-20 mass parts, polyethylene-the third
Olefin(e) acid ester rubber 10-20 mass parts, aromatic copolycarbonate 5-15 mass parts, plasticizer 10-15 mass parts, heat stabilizer 1-3
Mass parts and ultraviolet absorbing agent 1-3 mass parts.
As a preferred embodiment, the internal layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, chliorinated polyvinyl chloride 65-
70 mass parts, polymethyl methacrylate 20-25 mass parts, aluminium hydroxide 7-9 mass parts, polypropylene carbonate 12-15 mass
Part, plasticizer 12-14 mass parts, precipitated calcium carbonate 15-18 mass parts.
As a preferred embodiment, outer layer raw material forms are as follows: 100 mass parts of polyvinyl chloride, poly- 1- butyl ester 55-60 mass
Part, Methacrylate-butadiene-styrene 18-20 mass parts, Sodium Polyacrylate 12-15 mass parts, aluminium hydroxide 7-
9 mass parts, polypropylene carbonate 15-18 mass parts, polyethylene-acrylate rubber 13-16 mass parts, aromatic copolycarbonate
7-10 mass parts, plasticizer 11-13 mass parts, heat stabilizer 1.5-2 mass parts and ultraviolet absorbing agent 1.5-2 mass parts.
As a preferred embodiment, the plasticizer is dioctyl azelate, dioctyl phthalate or tripotassium phosphate
One kind of phenyl ester.
As a kind of more preferable scheme, the heat stabilizer is one kind of calcium stearate or lauryl mercaptan dibutyl tin.
As a kind of more preferable scheme, the PVC base composition and content are as follows: the ultraviolet absorbing agent is o-hydroxy
Phenyl formate, 2-(2 ˊ--5 ˊ of hydroxyl-aminomethyl phenyl) benzotriazole or 2,4-DihydroxyBenzophenone one kind.
The present invention also provides the preparation methods of above-mentioned flame retardant type Double-wall PVC pipe, which comprises the following steps:
(1) internal layer raw material and outer layer raw material are weighed respectively；
(2) internal layer raw material and outer layer raw material are respectively placed in container and are uniformly mixed, then put into kneader and mediate respectively, obtain
To kneading raw material；
(3) raw material after kneading is squeezed out by twin-screw extrusion equipment；
(4) it is formed, is cooling, cutting obtains finished product.
As a preferred embodiment, kneading temperature is 95-135 DEG C in the step (2)；Kneading time is 25-45min.
As a kind of more preferable scheme, screw speed control is in 20-50r/min in the step (3).
As a kind of more preferable scheme, extrusion temperature control is at 200-240 DEG C in the step (3).
The beneficial technical effect of the present invention lies in: it provides a kind of bis- with good flame-retardance, high temperature resistant and the PVC of environmental protection
Wall pipe.Flame retardant type Double-wall PVC tube wall of the invention has inside and outside two layers, is added to fire-retardant and high temperature resistant in layer materials
Material.Wherein polypropylene carbonate can be generated great amount of carbon dioxide by thermal decomposition under burning condition, to dilute PVC reality
Oxygen concentration in wall pipe surrounding enviroment, achieve the purpose that it is fire-retardant, and Sodium Polyacrylate have outstanding hydrophily and network molecule
Structure can function well as moisture absorption and moisture-keeping function, to add somewhat to the humidity of pvc pipe periphery subenvironment, drop
Low temperature, improves the temperature tolerance and anti-flammability of pvc pipe.Simultaneously the fire-retardant and heat-resisting material of addition be halogen-free and
Phosphorus solves the problems, such as pollution environment.In addition inner layer material design improves the compression strength of bellows, outer layer based on rigidity
Material is formulated with improving based on erosion-resisting characteristics as semi-rigid.By the design to tube wall ectonexine formula variation, pipe is improved
Wall intensity has combined impact resistance and toughness, improves the mechanical property of flame retardant type Double-wall PVC pipe.Simultaneously in flame retardant type
Appropriate precipitated calcium carbonate is filled in Double-wall PVC pipe, can reduce cost, improves dimensional stability and easily molded.
Specific embodiment
The invention will be further described combined with specific embodiments below.Following embodiment is only used for clearly illustrating
Technical solution of the present invention, and not intended to limit the protection scope of the present invention.
Embodiment 1
The present invention provides a kind of flame retardant type Double-wall PVC pipe, tube wall is made of double-layer structure, including internal layer and outer layer.
Internal layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, 60 mass parts of chliorinated polyvinyl chloride, poly-methyl methacrylate
30 mass parts of ester, 5 mass parts of aluminium hydroxide, 20 mass parts of polypropylene carbonate, 10 mass parts of dioctyl azelate, lightweight carbonic acid
22 mass parts of calcium.
Outer layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, poly- 50 mass parts of 1- butyl ester, methacrylic acid-butadiene-
25 mass parts of styrol copolymer, 10 mass parts of Sodium Polyacrylate, 5 mass parts of aluminium hydroxide, 20 mass parts of polypropylene carbonate,
20 mass parts of polyethylene-acrylate rubber, 5 mass parts of aromatic copolycarbonate, 10 mass parts of dioctyl azelate, stearic acid
3 mass parts of calcium and septichen phenyl ester, 3 mass parts.
Flame retardant type Double-wall PVC pipe is prepared as follows:
(1) internal layer raw material and outer layer raw material are weighed respectively；
(2) internal layer raw material and outer layer raw material are respectively placed in container and are uniformly mixed, then put into kneader and mediate respectively, obtain
To kneading raw material；Kneading temperature is 95 DEG C；Kneading time is 45min；
(3) raw material after kneading is squeezed out by twin-screw extrusion equipment, screw speed is controlled in 20r/min, extrusion temperature control
System is at 240 DEG C；
(4) it is formed, is cooling, cutting obtains finished product.
Embodiment 2
The present invention provides a kind of flame retardant type Double-wall PVC pipe, tube wall is made of double-layer structure, including internal layer and outer layer.
Internal layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, 65 mass parts of chliorinated polyvinyl chloride, poly-methyl methacrylate
25 mass parts of ester, 7 mass parts of aluminium hydroxide, 15 mass parts of polypropylene carbonate, 12 mass parts of dioctyl phthalate, lightweight
18 mass parts of calcium carbonate.
Outer layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, poly- 55 mass parts of 1- butyl ester, methacrylic acid-butadiene-
20 mass parts of styrol copolymer, 12 mass parts of Sodium Polyacrylate, 7 mass parts of aluminium hydroxide, 18 mass parts of polypropylene carbonate,
16 mass parts of polyethylene-acrylate rubber, 7 mass parts of aromatic copolycarbonate, 11 mass parts of dioctyl phthalate, ten
Two dibutyltin mercaptides, 2 mass parts and 2-(2 ˊ--5 ˊ of hydroxyl-aminomethyl phenyl) 2 mass parts of benzotriazole.
Flame retardant type Double-wall PVC pipe is prepared as follows:
(1) internal layer raw material and outer layer raw material are weighed respectively；
(2) internal layer raw material and outer layer raw material are respectively placed in container and are uniformly mixed, then put into kneader and mediate respectively, obtain
To kneading raw material；Kneading temperature is 110 DEG C；Kneading time is 40min；
(3) raw material after kneading is squeezed out by twin-screw extrusion equipment, screw speed is controlled in 30r/min, extrusion temperature control
System is at 225 DEG C；
(4) it is formed, is cooling, cutting obtains finished product.
Embodiment 3
The present invention provides a kind of flame retardant type Double-wall PVC pipe, tube wall is made of double-layer structure, including internal layer and outer layer.
Internal layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, 70 mass parts of chliorinated polyvinyl chloride, poly-methyl methacrylate
20 mass parts of ester, 9 mass parts of aluminium hydroxide, 12 mass parts of polypropylene carbonate, 14 mass parts of tricresyl phosphate, lightweight carbonic acid
15 mass parts of calcium.
Outer layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, poly- 60 mass parts of 1- butyl ester, methacrylic acid-butadiene-
18 mass parts of styrol copolymer, 15 mass parts of Sodium Polyacrylate, 9 mass parts of aluminium hydroxide, 15 mass parts of polypropylene carbonate,
13 mass parts of polyethylene-acrylate rubber, 10 mass parts of aromatic copolycarbonate, 13 mass parts of tricresyl phosphate, tristearin
Sour 1.5 mass parts of calcium and 1.5 mass parts of 2,4-DihydroxyBenzophenone.
Flame retardant type Double-wall PVC pipe is prepared as follows:
(1) internal layer raw material and outer layer raw material are weighed respectively；
(2) internal layer raw material and outer layer raw material are respectively placed in container and are uniformly mixed, then put into kneader and mediate respectively, obtain
To kneading raw material；Kneading temperature is 120 DEG C；Kneading time is 30min；
(3) raw material after kneading is squeezed out by twin-screw extrusion equipment, screw speed is controlled in 40r/min, extrusion temperature control
System is at 210 DEG C；
(4) it is formed, is cooling, cutting obtains finished product.
Embodiment 4
The present invention provides a kind of flame retardant type Double-wall PVC pipe, tube wall is made of double-layer structure, including internal layer and outer layer.
Internal layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, 80 mass parts of chliorinated polyvinyl chloride, poly-methyl methacrylate
15 mass parts of ester, 10 mass parts of aluminium hydroxide, 5 mass parts of polypropylene carbonate, 15 mass parts of dioctyl azelate, lightweight carbonic acid
8 mass parts of calcium.
Outer layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, poly- 70 mass parts of 1- butyl ester, methacrylic acid-butadiene-
10 mass parts of styrol copolymer, 20 mass parts of Sodium Polyacrylate, 10 mass parts of aluminium hydroxide, 12 mass of polypropylene carbonate
Part, 10 mass parts of polyethylene-acrylate rubber, 15 mass parts of aromatic copolycarbonate, 15 mass parts of dioctyl azelate, ten
1 mass parts of two dibutyltin mercaptides, 1 mass parts and septichen phenyl ester.
Flame retardant type Double-wall PVC pipe is prepared as follows:
(1) internal layer raw material and outer layer raw material are weighed respectively；
(2) internal layer raw material and outer layer raw material are respectively placed in container and are uniformly mixed, then put into kneader and mediate respectively, obtain
To kneading raw material；Kneading temperature is 135 DEG C；Kneading time is 25min；
(3) raw material after kneading is squeezed out by twin-screw extrusion equipment, screw speed is controlled in 50r/min, extrusion temperature control
System is at 200 DEG C；
(4) it is formed, is cooling, cutting obtains finished product.
Based on the above description of the preferred embodiments of the present invention, through the above description, related personnel completely can be with
Without departing from the scope of the technological thought of the present invention', various changes and amendments are carried out.The technical scope of this invention
It is not limited to the contents of the specification, it is necessary to determine the technical scope according to the scope of the claims.
Claims (10)
1. a kind of flame retardant type Double-wall PVC pipe, it is characterised in that: tube wall is made of double-layer structure, including internal layer and outer layer；In described
Layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, chliorinated polyvinyl chloride 60-80 mass parts, polymethyl methacrylate 15-30
Mass parts, aluminium hydroxide 5-10 mass parts, polypropylene carbonate 5-20 mass parts, plasticizer 10-15 mass parts, precipitated calcium carbonate
8-22 mass parts；Outer layer raw material composition are as follows: 100 mass parts of polyvinyl chloride, poly- 1- butyl ester 50-70 mass parts, methacrylic acid-fourth
Diene-styrene copolymer 10-25 mass parts, Sodium Polyacrylate 10-20 mass parts, aluminium hydroxide 5-10 mass parts, poly- carbonic acid
Acrylic ester 12-20 mass parts, aromatic copolycarbonate 5-15 mass parts, increase polyethylene-acrylate rubber 10-20 mass parts
Mould agent 10-15 mass parts, heat stabilizer 1-3 mass parts and ultraviolet absorbing agent 1-3 mass parts.
2. flame retardant type Double-wall PVC pipe according to claim 1, it is characterised in that: the internal layer raw material composition are as follows: polychlorostyrene second
100 mass parts of alkene, chliorinated polyvinyl chloride 65-70 mass parts, polymethyl methacrylate 20-25 mass parts, aluminium hydroxide 7-9 matter
Measure part, polypropylene carbonate 12-15 mass parts, plasticizer 12-14 mass parts, precipitated calcium carbonate 15-18 mass parts.
3. flame retardant type Double-wall PVC pipe according to claim 1, it is characterised in that: outer layer raw material composition are as follows: polyvinyl chloride
100 mass parts, poly- 1- butyl ester 55-60 mass parts, Methacrylate-butadiene-styrene 18-20 mass parts, poly- third
Olefin(e) acid sodium 12-15 mass parts, aluminium hydroxide 7-9 mass parts, polypropylene carbonate 15-18 mass parts, polyethylene-acrylate rubber
Glue 13-16 mass parts, aromatic copolycarbonate 7-10 mass parts, plasticizer 11-13 mass parts, heat stabilizer 1.5-2 mass parts
And ultraviolet absorbing agent 1.5-2 mass parts.
4. flame retardant type Double-wall PVC pipe according to claim 1, it is characterised in that: the plasticizer be dioctyl azelate,
One kind of dioctyl phthalate or tricresyl phosphate.
5. flame retardant type Double-wall PVC pipe according to claim 4, it is characterised in that: the heat stabilizer be calcium stearate or
One kind of lauryl mercaptan dibutyl tin.
6. flame retardant type Double-wall PVC pipe according to claim 5, it is characterised in that: the PVC base composition and content are as follows:
The ultraviolet absorbing agent is septichen phenyl ester, 2-(2 ˊ--5 ˊ of hydroxyl-aminomethyl phenyl) benzotriazole or 2,4- bis-
One kind of dihydroxy benaophenonel.
7. the preparation method of the flame retardant type Double-wall PVC pipe as described in claim 1-6 is any, which is characterized in that including following step
It is rapid:
(1) internal layer raw material and outer layer raw material are weighed respectively；
(2) internal layer raw material and outer layer raw material are respectively placed in container and are uniformly mixed, then put into kneader and mediate respectively, obtain
To kneading raw material；
(3) raw material after kneading is squeezed out by twin-screw extrusion equipment；
(4) it is formed, is cooling, cutting obtains finished product.
8. the preparation method of flame retardant type Double-wall PVC pipe according to claim 7, it is characterised in that: pinched in the step (2)
Closing temperature is 95-135 DEG C；Kneading time is 25-45min.
9. the preparation method of flame retardant type Double-wall PVC pipe according to claim 8, it is characterised in that: spiral shell in the step (3)
Bar revolving speed is controlled in 20-50r/min.
10. the preparation method of flame retardant type Double-wall PVC pipe according to claim 9, it is characterised in that: in the step (3)
Extrusion temperature is controlled at 200-240 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810678905.2A CN108976659A (en) | 2018-06-27 | 2018-06-27 | A kind of flame retardant type Double-wall PVC pipe and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810678905.2A CN108976659A (en) | 2018-06-27 | 2018-06-27 | A kind of flame retardant type Double-wall PVC pipe and preparation method thereof |
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| CN108976659A true CN108976659A (en) | 2018-12-11 |
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| CN201810678905.2A Pending CN108976659A (en) | 2018-06-27 | 2018-06-27 | A kind of flame retardant type Double-wall PVC pipe and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110194874A (en) * | 2019-06-06 | 2019-09-03 | 衢州职业技术学院 | A kind of flame retardant type high molecular material and preparation method thereof |
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| CN110194874A (en) * | 2019-06-06 | 2019-09-03 | 衢州职业技术学院 | A kind of flame retardant type high molecular material and preparation method thereof |
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Application publication date: 20181211 |
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