CN110079021B - High-temperature-aging-resistant flame-retardant polypropylene material for corrugated pipe and preparation method thereof - Google Patents
High-temperature-aging-resistant flame-retardant polypropylene material for corrugated pipe and preparation method thereof Download PDFInfo
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- 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
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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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
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- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C08L2203/18—Applications used for pipes
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- 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
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- C—CHEMISTRY; METALLURGY
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- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/06—Polymer mixtures characterised by other features having improved processability or containing aids for moulding methods
Abstract
The invention discloses a high-temperature aging resistant flame-retardant polypropylene material for corrugated pipes and a preparation method thereof. The flame-retardant polypropylene material has good flame-retardant effect, the flame-retardant grade can reach UL94V-2 grade, even V-0 grade, the high-temperature aging resistance is good, the flame-retardant polypropylene material can be baked for 360 hours at 150 ℃ without embrittlement, the processing performance is stable, the flame-retardant polypropylene material can be produced continuously, the flame-retardant polypropylene material can be laser-etched, the surface is smooth without granular sensation, a flame retardant is not separated out, and an extruded corrugated pipe has good hand feeling and is not easy to extrude and burst.
Description
Technical Field
The invention belongs to the technical field of polypropylene composite materials, and particularly relates to a high-temperature-aging-resistant flame-retardant polypropylene material for a corrugated pipe and a preparation method thereof.
Background
The corrugated pipe is a tubular elastic sensitive element formed by connecting foldable corrugated sheets along the folding and stretching direction, and is mainly applied to the industries of buildings, automobiles and the like. In recent years, with the annual increase of the automobile consumption in China, the demand of the automobile wire harness corrugated pipe is greatly increased, the performance requirements of the automobile corrugated pipe are continuously improved, mainly the requirements of flame retardant performance and aging performance are mainly met, the flame retardant requirements of different automobile factories are different, the requirements are generally in accordance with UL94V-2 or V-0 grade, and the requirements of high temperature resistance and aging resistance are also different.
Polypropylene is one of five general-purpose resins, has the excellent characteristics of light weight, easy processing, chemical resistance and the like, and is a common base material for preparing corrugated pipes. The conventional flame-retardant polypropylene material for the corrugated pipe is usually a halogen-antimony flame-retardant system, can basically meet the requirement on flame-retardant performance, but has the disadvantages that the addition amount of the flame retardant is high, the flame retardant cannot be well dispersed in polypropylene and is easy to precipitate, the prepared corrugated pipe has a non-smooth surface and even pimples, the high-temperature resistance and aging resistance are poor, the corrugated pipe is easy to crack when extruded, and the production efficiency and the product quality are influenced.
Therefore, it is necessary to develop a flame retardant polypropylene material with good flame retardant effect, good high temperature aging resistance and stable processability.
Disclosure of Invention
The invention aims to provide a high-temperature-aging-resistant flame-retardant polypropylene material for a corrugated pipe and a preparation method thereof.
The technical scheme adopted by the invention is as follows:
a high-temperature aging resistant flame-retardant polypropylene material for corrugated pipes comprises the following components in percentage by mass:
copolymerized polypropylene: 66% -82%;
brominated flame retardants: 10% -18%;
antimony-based flame retardant: 3% -6%;
flame retardant synergist: 1% -3%;
silicone master batch: 0.5 to 1.2 percent;
halogen absorbent: 0.2% -1%;
antioxidant: 0.5 to 1.2 percent;
toughening modifier: 2 to 4 percent.
Preferably, the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following components in percentage by mass:
copolymerized polypropylene: 71% -81%;
brominated flame retardants: 10% -18%;
antimony-based flame retardant: 3% -6%;
flame retardant synergist: 1% -2.5%;
silicone master batch: 0.5 to 1 percent;
halogen absorbent: 0.3 to 0.8 percent;
antioxidant: 0.5 to 1 percent;
toughening modifier: 2 to 4 percent.
Preferably, the polypropylene copolymer is an extrusion grade polypropylene copolymer with a melt index of 0.5-10 g/10min, a flexural modulus of 900-1200 MPa and a notched izod impact strength of more than 400J/m, and the melt index test conditions are as follows: 230 ℃/2.16 kg. The polypropylene copolymer with the melt index of 0.5-10 g/10min has medium and low fluidity, good processing plasticity, low price, good impact resistance, good toughness and medium bending modulus, is suitable for extruding various products, and a workpiece is not easy to extrude and burst.
Further preferably, the polypropylene copolymer is an extrusion grade polypropylene copolymer with a melt index of 3-5 g/10min, a flexural modulus of 950-1100 MPa and a notched izod impact strength of more than 400J/m, and the melt index test conditions are as follows: 230 ℃/2.16 kg.
Preferably, the bromine-based flame retardant is prepared by compounding at least two of tetrabromobisphenol A, tetrabromobisphenol A-bis (2, 3-dibromopropyl ether), decabromodiphenylethane, hexabromocyclododecane, tris (2, 3-dibromopropyl) isocyanurate (TBC), decabromodiphenylether, brominated polystyrene, hexabromobenzene, octabromobisphenol S ether and bis (2, 3-dibromopropyl) fumarate.
More preferably, the brominated flame retardant is prepared by compounding tri (2, 3-dibromopropyl) isocyanurate, decabromodiphenylethane and octabromobisphenol S ether.
Still more preferably, the brominated flame retardant is prepared by compounding tri (2, 3-dibromopropyl) isocyanurate, decabromodiphenylethane and octabromobisphenol S ether according to the mass ratio of 1:2: 0.5. The flame retardant is prepared by compounding tris (2, 3-dibromopropyl) isocyanurate, decabromodiphenylethane and octabromobisphenol S ether, wherein the flame retardant can fully exert respective flame retardant performance, the melting points of the tris (2, 3-dibromopropyl) isocyanurate and the octabromobisphenol S ether are lower, the flame retardant performance is good, but the temperature resistance of the tris (2, 3-dibromopropyl) isocyanurate is slightly poor, the price of the octabromobisphenol S ether is moderate, the tris (2, 3-dibromopropyl) isocyanurate and the octabromodiphenylethane are compounded with the decabromodiphenylethane which is good in price and flame retardant performance, the three are flame retardant in a synergistic mode, and then the bromine flame retardant and the antimony trioxide are matched, so that the flame retardant is good and stable in flame retardant effect, the addition amount of the.
Preferably, the antimony flame retardant is antimony trioxide.
Preferably, the particle size of the antimony trioxide is D50＝0.5～0.7μm、D90＝1.1～1.2μm、D981.8-2.0 μm, and the purity is more than 99.8%.
Preferably, the flame-retardant synergist is at least one of zinc borate, zinc oxide, melamine cyanurate, melamine, aluminum magnesium hydrotalcite and magnesium hydroxide.
Further preferably, the flame retardant synergist is aluminum magnesium hydrotalcite with the ignition loss of less than 5%, and the ignition loss test conditions are as follows: 600 ℃/2 h. The aluminum-magnesium hydrotalcite releases a large amount of water and carbon dioxide when being heated and decomposed, absorbs a large amount of heat, can reduce the temperature of a combustion system, releases water vapor and carbon dioxide gas which can dilute and block combustible gas, and generates magnesium-aluminum oxide through thermal decomposition and carbide formed when a high polymer material is combusted, can form a protective film on the surface of the material, so that further invasion of oxygen is blocked, and the flame retardant effect is also achieved.
Preferably, the silicone master batch takes one of PP, PE and POE as a carrier, and the number average molecular weight of the silicone is more than 10 ten thousand. The silicone master batch can obviously improve the dispersibility of the flame retardant in the extrusion process, thereby improving the flame retardant property, the surface gloss and the smoothness of products, eliminating the surface defect caused by adding the flame retardant, improving the smoothness of the extruded corrugated pipe, reducing the reject ratio of products, having excellent lubricating property, improving the extrusion speed of the products, reducing the defective rate and improving the fluidity of plastic processing.
Preferably, the halogen absorbent is a stearate.
Further preferably, the halogen absorbent is calcium stearate. Free bromine can be generated in the processing process of the bromine antimony flame retardant, the bromine antimony flame retardant is acidic and has strong corrosivity on an extruder, the flame retardance of the bromine antimony flame retardant can be reduced, the calcium stearate can absorb the free bromine, and the adverse effect of bromine residual in resin on the color and the stability of the resin is eliminated.
Preferably, the antioxidant is prepared from an antioxidant 1010, an antioxidant 168 and an antioxidant 136 according to a mass ratio (1-5): (1-5): (0.2-2) are compounded.
More preferably, the antioxidant is prepared by compounding an antioxidant 1010, an antioxidant 168 and an antioxidant 136 according to a mass ratio of 3:3: 1. Antioxidant 1010 is both process stable and provides long-term thermal stability by preventing thermal oxidative degradation during use; the antioxidant 168 has low volatility and is resistant to hydrolysis, which protects the polymer during processing by decomposing hydroperoxides; the antioxidant 136 is a carbon-centered radical scavenger, lactone stabilizer, which can inhibit oxidation caused by processing at the beginning. The antioxidant 1010, the antioxidant 168 and the antioxidant 136 are compounded for use, and the synergistic effect is achieved among the three, so that the effect is more excellent.
Preferably, the toughening modifier is at least one of POE (ethylene-octene copolymer), EVA (ethylene-vinyl acetate copolymer), MBS (methyl methacrylate-butadiene-styrene copolymer), SBS (styrene-butadiene-styrene block copolymer), SEBS (hydrogenated styrene-butadiene block copolymer), high rubber powder and CPE (chlorinated polyethylene).
Further preferably, the toughening modifier is CPE with the chlorine content of 30 wt% -35 wt%. When the chlorine content of the CPE reaches 25 to 40 weight percent, the CPE is rubbery, and has certain flame retardant property and aging resistance while toughening.
The preparation method of the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing;
2) and transferring the materials in the high-speed stirrer into an extruder, and extruding, cooling, bracing and granulating to obtain the high-temperature aging-resistant flame-retardant polypropylene material for the corrugated pipe.
Preferably, the mixing in step 1) is carried out at 40-60 ℃.
Further preferably, the mixing of step 1) is carried out at 50 ℃.
Preferably, the extrusion in the step 2) is carried out at 170-190 ℃.
The invention has the beneficial effects that: the flame-retardant polypropylene material has a good flame-retardant effect, the flame-retardant grade can reach UL94V-2 grade, even V-0 grade, the high-temperature aging resistance is good, the flame-retardant polypropylene material can be baked for 360 hours at 150 ℃ without embrittlement, the processing performance is stable, the flame-retardant polypropylene material can be produced continuously, the flame-retardant polypropylene material can be laser-etched, the surface is smooth without granular sensation, a flame retardant is not separated out, and an extruded corrugated pipe has good hand feeling and is not easy to extrude and burst.
1) The preparation method is simple and efficient, is easy to ensure the flame retardance and the color brightness of the material, has high production efficiency, and is suitable for various double-screw extruders;
2) the invention disperses the materials at 40-60 ℃ and can volatilize the water in the materials;
3) the flame-retardant polyethylene material is extruded at 170-190 ℃, has a good protection effect on a bromine flame retardant, silicone master batches and an antioxidant, and does not influence the long-term aging performance of the flame-retardant polyethylene material.
Detailed Description
The invention will be further explained and illustrated with reference to specific examples.
Example 1:
the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following raw materials in percentage by weight:
TABLE 1 composition table of raw materials of high temperature aging resistant flame retardant polypropylene material for corrugated pipe
The preparation method of the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing at 50 ℃, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing at 50 ℃;
2) and (3) transferring the materials in the high-speed stirrer into an extruder, extruding (the extrusion temperature is 170-190 ℃), cooling, bracing and granulating to obtain the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe.
Example 2:
the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following raw materials in percentage by weight:
TABLE 2 composition table of raw materials of high temperature aging resistant flame retardant polypropylene material for corrugated pipe
The preparation method of the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing at 50 ℃, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing at 50 ℃;
2) and (3) transferring the materials in the high-speed stirrer into an extruder, extruding (the extrusion temperature is 170-190 ℃), cooling, bracing and granulating to obtain the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe.
Example 3:
the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following raw materials in percentage by weight:
TABLE 3 composition table of raw materials of high temperature aging resistant flame retardant polypropylene material for corrugated pipe
The preparation method of the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing at 50 ℃, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing at 50 ℃;
2) and (3) transferring the materials in the high-speed stirrer into an extruder, extruding (the extrusion temperature is 170-190 ℃), cooling, bracing and granulating to obtain the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe.
Example 4:
the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following raw materials in percentage by weight:
TABLE 4 composition table of raw materials of high temperature aging resistant flame retardant polypropylene material for corrugated pipe
The preparation method of the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing at 50 ℃, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing at 50 ℃;
2) and (3) transferring the materials in the high-speed stirrer into an extruder, extruding (the extrusion temperature is 170-190 ℃), cooling, bracing and granulating to obtain the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe.
Example 5:
the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following raw materials in percentage by weight:
TABLE 5 composition table of raw materials of high temperature aging resistant flame retardant polypropylene material for corrugated pipe
The preparation method of the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing at 50 ℃, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing at 50 ℃;
2) and (3) transferring the materials in the high-speed stirrer into an extruder, extruding (the extrusion temperature is 170-190 ℃), cooling, bracing and granulating to obtain the high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe.
Comparative example 1:
the flame-retardant polypropylene material comprises the following raw materials in percentage by weight:
TABLE 6 composition of raw materials for flame-retardant polypropylene material
The preparation method of the flame-retardant polypropylene material comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing at 50 ℃, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing at 50 ℃;
2) and (3) transferring the materials in the high-speed stirrer into an extruder, extruding (the extrusion temperature is 170-190 ℃), cooling, bracing and granulating to obtain the flame-retardant polypropylene material.
Comparative example 2:
the flame-retardant polypropylene material comprises the following raw materials in percentage by weight:
TABLE 7 composition of raw materials for flame retardant polypropylene materials
The preparation method of the flame-retardant polypropylene material comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing at 50 ℃, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing at 50 ℃;
2) and (3) transferring the materials in the high-speed stirrer into an extruder, extruding (the extrusion temperature is 170-190 ℃), cooling, bracing and granulating to obtain the flame-retardant polypropylene material.
Comparative example 3:
the flame-retardant polypropylene material comprises the following raw materials in percentage by weight:
TABLE 8 composition of raw materials for flame retardant polypropylene materials
The preparation method of the flame-retardant polypropylene material comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing at 50 ℃, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing at 50 ℃;
2) and (3) transferring the materials in the high-speed stirrer into an extruder, extruding (the extrusion temperature is 170-190 ℃), cooling, bracing and granulating to obtain the flame-retardant polypropylene material.
Comparative example 4:
the flame-retardant polypropylene material comprises the following raw materials in percentage by weight:
TABLE 9 composition of raw materials for flame retardant polypropylene materials
The preparation method of the flame-retardant polypropylene material comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing at 50 ℃, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing at 50 ℃;
2) and (3) transferring the materials in the high-speed stirrer into an extruder, extruding (the extrusion temperature is 170-190 ℃), cooling, bracing and granulating to obtain the flame-retardant polypropylene material.
Note:
indexes of the raw materials in examples 1 to 5 and comparative examples 1 to 4 are as follows:
7032E3 (exxonmobil): the melt index is 4g/10min, the flexural modulus is 967MPa, the notched Izod impact strength is more than 400J/m, and the test conditions of the melt index are as follows: 230 ℃/2.16 kg;
antimony trioxide: particle diameter D50＝0.5～0.7μm、D90＝1.1～1.2μm、D981.8-2.0 μm, and the purity is more than 99.8%;
aluminum magnesium hydrotalcite: the ignition loss is less than 5 percent, and the test conditions of the ignition loss are as follows: 600 ℃/2 h;
silicone master batch: one of PP, PE and POE is taken as a carrier, and the number average molecular weight of silicone is more than 10 ten thousand;
CPE: the chlorine content is 30-35 wt%.
Test example:
the flame-retardant polypropylene materials of examples 1-5 and comparative examples 1-4 were respectively injection molded (molding process conditions: injection temperature (charging gate) 175/185/185/190 ℃ (nozzle), injection pressure 50MPa, dwell time 8s, cooling time 6s) by a CG110E horizontal injection machine) to prepare standard samples, and then performance tests were performed, and the flame-retardant polypropylene materials of examples 1-5 and comparative examples 1-4 were injection molded to prepare corrugated pipes, and appearance and feel of the corrugated pipes were tested, with the test results shown in the following table:
TABLE 10 Performance test results of the flame retardant Polypropylene materials of examples 1-5
TABLE 11 Performance test results of the flame retardant Polypropylene materials of comparative examples 1 to 4
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. A high-temperature aging resistant flame-retardant polypropylene material for corrugated pipes is characterized in that: the composite material comprises the following components in percentage by mass:
copolymerized polypropylene: 66% -82%;
brominated flame retardants: 10% -18%;
antimony-based flame retardant: 3% -6%;
flame retardant synergist: 1% -3%;
silicone master batch: 0.5 to 1.2 percent;
halogen absorbent: 0.2% -1%;
antioxidant: 0.5 to 1.2 percent;
toughening modifier: 2% -4%;
the brominated flame retardant is prepared by compounding tri (2, 3-dibromopropyl) isocyanurate, decabromodiphenylethane and octabromobisphenol S ether according to the mass ratio of 1:2: 0.5;
the flame retardant synergist is aluminum magnesium hydrotalcite with the ignition loss of less than 5%, and the ignition loss test conditions are as follows: 600 ℃/2 h;
the antioxidant is prepared from an antioxidant 1010, an antioxidant 168 and an antioxidant 136 in a mass ratio (1-5): (1-5): (0.2-2) are compounded.
2. The high temperature aging resistant flame retardant polypropylene material for corrugated pipe as claimed in claim 1, wherein: the polypropylene copolymer is an extrusion grade polypropylene copolymer with a melt index of 0.5-10 g/10min, a flexural modulus of 900-1200 MPa and a cantilever beam notch impact strength of more than 400J/m, and the melt index test conditions are as follows: 230 ℃/2.16 kg.
3. The high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe as claimed in any one of claims 1 to 2, wherein: the antimony flame retardant is antimony trioxide.
4. The high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe as claimed in any one of claims 1 to 2, wherein: the silicone master batch takes one of PP, PE and POE as a carrier, and the number average molecular weight of the silicone is more than 10 ten thousand.
5. The high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe as claimed in any one of claims 1 to 2, wherein: the halogen absorbent is stearate.
6. The high-temperature aging resistant flame-retardant polypropylene material for the corrugated pipe as claimed in any one of claims 1 to 2, wherein: the toughening modifier is at least one of POE, EVA, MBS, SBS, SEBS, high rubber powder and CPE.
7. The preparation method of the high temperature aging resistant flame retardant polypropylene material for corrugated pipes as claimed in any one of claims 1 to 6, wherein the preparation method comprises the following steps: the method comprises the following steps:
1) adding a brominated flame retardant, an antimony flame retardant, a flame retardant synergist, silicone master batches, a halogen absorbent and an antioxidant into a high-speed stirrer, uniformly mixing, adding a polypropylene copolymer and a toughening modifier, and uniformly mixing;
2) and transferring the materials in the high-speed stirrer into an extruder, and extruding, cooling, bracing and granulating to obtain the high-temperature aging-resistant flame-retardant polypropylene material for the corrugated pipe.
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| CN110591228A (en) * | 2019-10-09 | 2019-12-20 | 江苏万纳普新材料科技有限公司 | Special flame-retardant synergistic functional master batch for polypropylene modification and preparation method thereof |
| CN114106457B (en) * | 2021-10-20 | 2023-07-25 | 广东聚石化学股份有限公司 | Extrusion type flame-retardant polypropylene material and preparation method and application thereof |
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