CN112321945A - Precipitation-resistant halogen-free flame-retardant polypropylene composite material and preparation method thereof - Google Patents
Precipitation-resistant halogen-free flame-retardant polypropylene composite material 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
- C08L23/10—Homopolymers or copolymers of propene
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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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- C08L2201/02—Flame or fire retardant/resistant
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
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- 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
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a precipitation-resistant halogen-free flame-retardant polypropylene composite material and a preparation method thereof. The polypropylene composite material disclosed by the invention has excellent flame retardant property and mechanical property, can keep good appearance and flame retardant property after being stored for a long time under a high-temperature and high-humidity condition, and can be applied to the new energy automobile industry with higher comprehensive requirements on flame retardant materials.
Description
Technical Field
The invention belongs to the field of polypropylene composite materials and preparation methods thereof, and particularly relates to a precipitation-resistant halogen-free flame-retardant polypropylene composite material and a preparation method thereof.
Background
Polypropylene is a very widely used resin. Because polypropylene is flammable, when the polypropylene is applied to parts with fire-proof requirements, such as new energy automobile battery modules, flame-retardant modification is needed. At present, the flame retardants suitable for polypropylene in the market are various, and among them, a halogen-free flame retardant represented by an intumescent flame retardant such as ammonium polyphosphate is widely used due to the advantages of high flame retardant efficiency, low toxicity, less smoke release and the like. However, the currently commercially available intumescent flame retardants often have the problem of precipitation from the polypropylene matrix under high temperature and high humidity conditions. This not only affects the appearance of the surface of the article, but also causes a reduction in the fire resistance of the article.
For solving the problem of precipitation of the intumescent flame retardant, the existing reports mainly utilize the surface coating technology of the flame retardant to improve. For example, patent CN 102796319 a discloses an intumescent flame retardant polypropylene composition. The invention mixes ammonium polyphosphate, polyhydric alcohol and melamine according to a certain proportion, then uses PE wax to coat the surface, then mixes with other components such as polypropylene and extrudes for granulation, and the product can overcome the defects of strong hygroscopicity and easy hydrolysis of the flame retardant. CN 104448560A discloses a halogen-free intumescent flame retardant for polypropylene, which is prepared by compounding ammonium polyphosphate, a charring agent, an auxiliary flame retardant, a modification auxiliary agent and a processing auxiliary agent, wherein the surface of the ammonium polyphosphate is coated by substances such as silane, and the like, so that the problem that the flame retardant is easy to separate out from the material is solved.
In the existing flame retardant surface coating technology, the coating agent and the flame retardant components are not mainly connected by chemical bonds, so that the coating agent is easily stripped from the surface of the flame retardant under the shearing action of a screw rod in the blending extrusion processing process of the coated flame retardant and other components such as polypropylene, and the expected effect of solving the problem of flame retardant precipitation cannot be finally achieved. Meanwhile, the introduction of the existing flame retardant surface coating agent can also cause the reduction of the phosphorus content of the flame retardant, and the flame retardant effect of the flame retardant can be reduced to a certain extent.
Disclosure of Invention
The invention aims to solve the technical problem of providing a precipitation-resistant halogen-free flame-retardant polypropylene composite material and a preparation method thereof, wherein a phosphorus-containing surface coating agent is coated on the surface of a halogen-free flame retardant through chemical bond action, so that the defects of weak coating action and reduced phosphorus content of the coated flame retardant in the existing flame retardant surface coating technology can be effectively overcome, and the precipitation problem of the halogen-free flame retardant in the polypropylene composite material is obviously improved while excellent flame retardant performance is ensured.
The invention relates to a polypropylene composite material, which comprises the following raw materials in parts by weight:
wherein the flame retardant is prepared by suspending the intumescent flame retardant in toluene containing molecular sieve to react with phosphate ester and trifluoroacetic acid.
Further, the flame retardant is prepared by suspending the intumescent flame retardant in toluene containing molecular sieve, reacting with phosphate ester and trifluoroacetic acid and subsequently removing the solvent and molecular sieve.
The polypropylene is at least one of homopolymerized polypropylene and copolymerized polypropylene; wherein the melt flow rate of the polypropylene at 230 ℃ and 2.16kg is 1-150 g/10 min; the charring agent is triazine charring agent.
The weight average molecular weight of the triazine charring agent is 2500-50000 measured by a GPC method.
Further, the char-forming agent includes, but is not limited to, poly (4, 6-dichloro-N-butyl-1, 3, 5-triazine-2-amino-ethylenediamine), N-ethyltriazine-piperazine copolymer.
The glass fiber is chopped glass fiber, and the diameter of a single fiber is 7-20 mu m; the toughening agent is one or more of ethylene-butylene copolymer, ethylene-octene copolymer, ethylene-propylene-diene monomer rubber and hydrogenated styrene-butadiene block copolymer; the melt flow rate of the maleic anhydride grafted polypropylene at 190 ℃ under 2.16kg is 1-260 g/10 min; the antioxidant is one or more of hindered phenols, phosphites, thioether antioxidants and hindered amine antioxidants; the lubricant is one or more of stearate, stearate and amide lubricants; the anti-dripping agent is polytetrafluoroethylene anti-dripping agent; the toner is one or more of inorganic pigment, organic pigment and organic dye.
The antioxidant includes but is not limited to antioxidant 1010, antioxidant 168, antioxidant DSTP, hindered amine 3853. The lubricants include, but are not limited to, ethylene bis stearamide, zinc stearate, and erucamide.
The weight ratio of the intumescent flame retardant to the phosphate to the trifluoroacetic acid is 92-95: 5-8: 0.4 to 0.6; the molecular sieve is 0.2-0.3 times of the weight of the intumescent flame retardant; the toluene is 3-4 times of the weight of the intumescent flame retardant.
The intumescent flame retardant is ammonium polyphosphate and/or melamine polyphosphate; the phosphate ester is
Wherein R is1Represents a hydrogen atom or an alkyl group, R2Represents an alkyl group; the aperture of the molecular sieve is 3-5 nm, and the specific surface area is 400-700 m2/g。
R in the phosphate1And R2The number of carbon atoms in the middle alkyl group is 1 to 18.
Further, the phosphate esters include, but are not limited to, di-n-butyl phosphate, monobutyl phosphate, octadecyl phosphate.
The toluene was pre-dried before use to a water content of 100ppm or less.
The flame retardant is prepared by the following method, specifically: dispersing the intumescent flame retardant in toluene, then adding phosphate, trifluoroacetic acid and a molecular sieve, stirring at 100 ℃, then removing the molecular sieve, and sequentially filtering and drying the remaining mixture to obtain the flame retardant.
The preparation method of the polypropylene composite material comprises the following steps:
weighing the polypropylene, the flame retardant, the char forming agent, the toughening agent, the maleic anhydride grafted polypropylene, the antioxidant, the lubricant and the anti-dripping agent according to the weight parts, and uniformly mixing;
and feeding the mixed raw materials into a double-screw extruder from a main feeding port, feeding glass fibers into the double-screw extruder from a side feeding port, and extruding and granulating to obtain the polypropylene composite material.
The invention also discloses application of the polypropylene composite material.
Advantageous effects
The surface of the novel intumescent flame retardant obtained by the invention has hydrophobicity, and the compatibility with a polypropylene matrix is improved. Because the hydrophobic groups on the surface are connected with the flame retardant body through chemical bonds, the water delivery layer on the surface of the novel intumescent flame retardant has better stability and is not easy to damage in the processing process. In addition, the phosphate used in the surface modification process of the flame retardant also has a flame retardant effect, so that the flame retardant effect of the obtained novel intumescent flame retardant is not obviously attenuated. Meanwhile, the carbon forming agent used in the invention is a high molecular weight carbon forming agent which is not easy to precipitate in a polypropylene matrix. Experiments show that the product of the invention has no obvious phenomenon of separating out the flame retardant under the conditions of high temperature and high humidity, and keeps excellent flame retardant performance before and after the damp-heat storage experiment; as the compatibility of the flame retardant and the polypropylene matrix is improved, the mechanical property of the product is also improved to a certain extent.
The precipitation-resistant halogen-free flame-retardant polypropylene composite material for new energy automobiles, provided by the invention, has excellent flame retardant property and mechanical property, can keep good appearance and flame retardant property after being stored for a long time under high temperature and high humidity conditions, and can be applied to the new energy automobile industry with higher comprehensive requirements on flame retardant materials.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
(1) Raw material components
Polypropylene: copolymerized polypropylene, with a melt flow rate of 10g/10min at a temperature of 230 ℃ and a load of 2.16kg, manufactured by Exxon Mobil;
glass fiber: the diameter of the monofilament is 13 mu m, and the manufacturer boulder group is manufactured;
a char-forming agent: a macromolecule triazine charring agent, with the brand number of PPMT and the weight average molecular weight of 2755, the manufacturer Guangzhou Xijia chemical industry;
a toughening agent: ethylene butene copolymer, manufacturer korean LG, designation LC 168;
maleic anhydride grafted polypropylene: the melt flow rate at 190 ℃ under a load of 2.16kg is 100g/10min, the manufacturer is Pulang;
antioxidant: the marks of RIANOX 1010 and RIANOX 168 are added in equal weight ratio, and the manufacturer thereof is linaron.
Lubricant: ethylene bis stearamide, a chemical product of Sichuan polymerization of manufacturers;
anti-dripping agent: polytetrafluoroethylene having an average particle diameter of 200 to 280 μm and a density of 2.12 to 2.16g/cm3The east of Shandong of the manufacturer;
toner: carbon black, manufacturer cabot;
traditional intumescent flame retardants: ammonium polyphosphate, brand APP231, manufacturer Shandong Chungsheng.
The preparation method of the novel intumescent flame retardant comprises the following steps: dispersing the intumescent flame retardant in toluene, and then adding phosphate,Trifluoroacetic acid and molecular sieves. The mixture was stirred continuously at 100 ℃ for 6 h. Then removing the molecular sieve, and sequentially filtering and drying the residual mixture to obtain the novel intumescent flame retardant. Wherein, the intumescent flame retardant: ammonium polyphosphate, brand APP231, manufacturer Shandong Chungsheng; phosphate ester: r1Is a hydrogen atom, R2Octadecyl, manufacturer sandan bright; molecular sieve: the pore diameter is 3-5 nm, and the specific surface area is 400-700 m2Per g, manufacturer Beijing YinuoKa. Toluene: analytically pure, the reagent of the manufacturer's Chinese medicine. Pre-drying before use to obtain water content lower than 100 ppm.
Wherein the weight ratio of the intumescent flame retardant to the phosphate to the trifluoroacetic acid is 93.5: 6: 0.5. the addition amount of the molecular sieve is 0.25 times of the weight of the intumescent flame retardant. The addition amount of toluene was 3.5 times the weight of the intumescent flame retardant.
The preparation method of the coated intumescent flame retardant comprises the following steps: mixing the traditional intumescent flame retardant and PE wax at a high speed at a temperature of 80 +/-5 ℃ to obtain a coated intumescent flame retardant with the surface coated by the PE wax, wherein the traditional intumescent flame retardant is ammonium polyphosphate and is APP231, and the manufacturer is Shandong Yong; the weight average molecular weight of the PE wax was 562, Beckhols, USA. The weight ratio of the traditional intumescent flame retardant to the PE wax is 94: 6.
(2) and (3) performance testing: the tensile property test is carried out according to ISO 527-2-2012, the size of a test sample is 150 multiplied by 10 multiplied by 4mm, and the tensile speed is 50 mm/min; the flexural modulus performance test is carried out according to ISO 178-2001, the size of a sample is 80 multiplied by 10 multiplied by 4mm, and the test speed is 2 mm/min; the notched impact strength test was carried out in accordance with ISO 179-1/1eA-2000, the specimen size being 80X 8X 4 mm; the oxygen index test was carried out in accordance with GB/T2406.2-2009, sample sizes 80X 10X 4 mm. The damp-heat storage experiment is carried out according to GB/T2423.50-2012, the size of a sample is 80 multiplied by 10 multiplied by 4mm, the environmental temperature is 85 ℃, the relative humidity is 85%, and the test time is 504 h.
Example 1
83kg of polypropylene, 10kg of novel intumescent flame retardant, 2kg of char forming agent, 3.5kg of toughening agent, 0.6kg of antioxidant, 0.2kg of lubricant, 0.3kg of anti-dripping agent and 0.4kg of toner are mixed uniformly in a blender, fed into a double-screw extruder from a main feeding port, and subjected to melt extrusion and granulation to prepare the product. Wherein the temperature of each heating area from the feeding port to the die head is respectively set as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third to ninth zone and 190 ℃ in the tenth zone. The vacuum degree is-0.06 MPa.
Example 2
73kg of polypropylene, 18kg of novel intumescent flame retardant, 4kg of char forming agent, 3.5kg of toughening agent, 0.6kg of antioxidant, 0.2kg of lubricant, 0.3kg of anti-dripping agent and 0.4kg of toner are mixed uniformly in a blender, fed into a double-screw extruder from a main feeding port, and subjected to melt extrusion and granulation to prepare the product. Wherein the temperature of each heating area from the feeding port to the die head is respectively set as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third to ninth zone and 190 ℃ in the tenth zone. The vacuum degree is-0.06 MPa.
Example 3
63kg of polypropylene, 26kg of novel intumescent flame retardant, 6kg of char forming agent, 3.5kg of toughening agent, 0.6kg of antioxidant, 0.2kg of lubricant, 0.3kg of anti-dripping agent and 0.4kg of toner are mixed uniformly in a blender, fed into a double-screw extruder from a main feeding port, and subjected to melt extrusion and granulation to prepare the product. Wherein the temperature of each heating area from the feeding port to the die head is respectively set as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third to ninth zone and 190 ℃ in the tenth zone. The vacuum degree is-0.06 MPa.
Example 4
39kg of polypropylene, 18kg of novel intumescent flame retardant, 4kg of char forming agent, 3.5kg of toughening agent, 4kg of maleic anhydride grafted polypropylene, 0.6kg of antioxidant, 0.2kg of lubricant, 0.3kg of anti-dripping agent and 0.4kg of toner are uniformly mixed in a blending machine, fed into a double-screw extruder from a main feeding port, 30kg of glass fiber is fed from a side feeding port of the double-screw extruder, and extruded and granulated to prepare the product. Wherein the temperature of each heating area from the feeding port to the die head is respectively set as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third to ninth zone and 190 ℃ in the tenth zone. The vacuum degree is-0.06 MPa.
Example 5
77.9kg of polypropylene, 18kg of novel intumescent flame retardant, 4kg of char forming agent and 0.1kg of antioxidant are uniformly mixed in a blender, fed into a double-screw extruder from a main feeding port, and subjected to melt extrusion and granulation to prepare the product. Wherein the temperature of each heating area from the feeding port to the die head is respectively set as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third to ninth zone and 190 ℃ in the tenth zone. The vacuum degree is-0.06 MPa.
Comparative example 1
73kg of polypropylene, 18kg of traditional intumescent flame retardant, 4kg of char forming agent, 3.5kg of toughening agent, 0.6kg of antioxidant, 0.2kg of lubricant, 0.3kg of anti-dripping agent and 0.4kg of toner are mixed uniformly in a blender, fed into a double-screw extruder from a main feeding port, and subjected to melt extrusion and granulation to prepare the product. Wherein the temperature of each heating area from the feeding port to the die head is respectively set as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third to ninth zone and 190 ℃ in the tenth zone. The vacuum degree is-0.06 MPa.
Comparative example 2
73kg of polypropylene, 18kg of coated intumescent flame retardant, 4kg of char forming agent, 3.5kg of toughening agent, 0.6kg of antioxidant, 0.2kg of lubricant, 0.3kg of anti-dripping agent and 0.4kg of toner are mixed uniformly in a blender, fed into a double-screw extruder from a main feeding port, and subjected to melt extrusion and granulation to prepare the product. Wherein the temperature of each heating area from the feeding port to the die head is respectively set as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third to ninth zone and 190 ℃ in the tenth zone. The vacuum degree is-0.06 MPa.
Comparative example 3
The intumescent flame retardant A is prepared by the following method: dispersing the intumescent flame retardant in toluene, then adding phosphate, trifluoroacetic acid and a molecular sieve, stirring the mixture for 6 hours at 100 ℃, and sequentially filtering and drying to obtain the intumescent flame retardant A. The weight ratio of the intumescent flame retardant to the phosphate to the trifluoroacetic acid is 93.5: 6: 0.5. the addition amount of the molecular sieve is 0.25 times of the weight of the intumescent flame retardant. The addition amount of toluene was 3.5 times the weight of the intumescent flame retardant.
73kg of polypropylene, 18kg of intumescent flame retardant A, 4kg of char forming agent, 3.5kg of toughening agent, 0.6kg of antioxidant, 0.2kg of lubricant, 0.3kg of anti-dripping agent and 0.4kg of toner are mixed uniformly in a blender, fed into a double-screw extruder from a main feeding port, and subjected to melt extrusion and granulation to prepare the product. Wherein the temperature of each heating area from the feeding port to the die head is respectively set as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third to ninth zone and 190 ℃ in the tenth zone. Vacuum degree of-0.06 MPa
Comparative example 4
The intumescent flame retardant B is prepared by the following method: dispersing the intumescent flame retardant in toluene, then adding phosphate, trifluoroacetic acid, a molecular sieve and a char forming agent, stirring the mixture for 6h at 100 ℃, removing the molecular sieve, and sequentially filtering and drying the rest mixture to obtain the intumescent flame retardant B. The weight ratio of the intumescent flame retardant to the phosphate to the trifluoroacetic acid to the char forming agent is 93.5: 6: 0.5: 22. the addition amount of the molecular sieve is 0.25 times of the weight of the intumescent flame retardant. The addition amount of toluene was 3.5 times the weight of the intumescent flame retardant.
73kg of polypropylene, 22kg of intumescent flame retardant B, 3.5kg of toughening agent, 0.6kg of antioxidant, 0.2kg of lubricant, 0.3kg of anti-dripping agent and 0.4kg of toner are uniformly mixed in a blender, fed into a double-screw extruder from a main feeding port, and subjected to melt extrusion and granulation to prepare the product. Wherein the temperature of each heating area from the feeding port to the die head is respectively set as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third to ninth zone and 190 ℃ in the tenth zone. The vacuum degree is-0.06 MPa.
Comparative example 5
73kg of polypropylene, 4kg of charring agent, 3.5kg of toughening agent, 0.6kg of antioxidant, 0.2kg of lubricant, 0.3kg of anti-dripping agent, 0.4kg of toner, intumescent flame retardant (ammonium polyphosphate), phosphate and trifluoroacetic acid are uniformly mixed in a blending machine, and then the mixture is fed into a double-screw extruder from a main feeding port, and is subjected to melt extrusion and granulation to prepare the product. Wherein the temperature of each heating area from the feeding port to the die head is respectively set as follows: 190 ℃ in the first zone, 200 ℃ in the second zone, 210 ℃ in the third to ninth zone and 190 ℃ in the tenth zone. The vacuum degree is-0.06 MPa. Wherein the weight ratio of the intumescent flame retardant to the phosphate to the trifluoroacetic acid is 93.5: 6: 0.5. the total amount of the intumescent flame retardant, the phosphate and the trifluoroacetic acid is 18 Kg.
TABLE 1 formulation of examples and comparative examples (in parts by weight) and test results of sample performance
As can be seen from the test results of the examples 1 to 3 in the table 1, the oxygen index of the sample can be obviously improved by increasing the addition amount of the flame retardant and the char-forming agent, and the samples with different addition amounts of the flame retardant and the char-forming agent do not generate obvious precipitation phenomenon after a damp-heat storage experiment, and the attenuation degree of the oxygen index is very small. The test results of example 2 and example 4 show that after the glass fiber and maleic anhydride graft are added in the formula, the sample also keeps no obvious precipitation phenomenon and smaller oxygen index attenuation degree through the damp-heat storage experiment. In the test results of the example 2 and the comparative examples 1-2, the oxygen index level of the sample using the novel intumescent flame retardant is equivalent to the oxygen index of the sample using the traditional intumescent flame retardant and is obviously higher than the oxygen index of the product coated with the intumescent flame retardant, which indicates that the novel intumescent flame retardant keeps higher flame retardant efficiency; after a damp and hot storage experiment, a traditional intumescent flame retardant or a sample coated with the intumescent flame retardant is separated out, and the oxygen index is obviously reduced, which shows that the problem that the intumescent flame retardant is easy to separate out under the high-temperature and high-humidity conditions can be effectively solved by using the novel intumescent flame retardant. It can also be seen from the test results of table 1 that the samples using the new intumescent flame retardant have better mechanical properties than the samples using the other two intumescent flame retardants. It is noted that the method of directly adding the intumescent flame retardant, the phosphate and the trifluoroacetic acid into the blend without pre-reaction can not effectively improve the precipitation problem of the composite material.
The precipitation-resistant halogen-free flame-retardant polypropylene composite material can effectively overcome the problem that a flame retardant is easy to precipitate, can keep high-efficiency flame-retardant performance before and after being stored under high-temperature and high-humidity conditions, has excellent mechanical performance, and can be applied to parts of new energy automobiles with long-term high-efficiency flame-retardant performance requirements.
Claims (10)
1. The polypropylene composite material is characterized by comprising the following raw materials in parts by weight:
wherein the flame retardant is prepared by suspending the intumescent flame retardant in toluene containing molecular sieve to react with phosphate ester and trifluoroacetic acid.
2. The polypropylene composite according to claim 1, wherein the polypropylene is at least one of homo-polypropylene and co-polypropylene; the charring agent is triazine charring agent.
3. The polypropylene composite material according to claim 2, wherein the weight average molecular weight of the triazine char-forming agent is 2500 to 50000.
4. The polypropylene composite material according to claim 1, wherein the glass fiber is a chopped glass fiber, and the monofilament diameter is 7-20 μm; the toughening agent is one or more of ethylene-butylene copolymer, ethylene-octene copolymer, ethylene-propylene-diene monomer rubber and hydrogenated styrene-butadiene block copolymer; the melt flow rate of the maleic anhydride grafted polypropylene at 190 ℃ under 2.16kg is 1-260 g/10 min; the antioxidant is one or more of hindered phenols, phosphites, thioether antioxidants and hindered amine antioxidants; the lubricant is one or more of stearate, stearate and amide lubricants; the anti-dripping agent is polytetrafluoroethylene anti-dripping agent; the toner is one or more of inorganic pigment, organic pigment and organic dye.
5. The polypropylene composite material according to claim 1, wherein the weight ratio of the intumescent flame retardant to the phosphate to the trifluoroacetic acid is 92-95: 5-8: 0.4 to 0.6; the molecular sieve is 0.2-0.3 times of the weight of the intumescent flame retardant; the toluene is 3-4 times of the weight of the intumescent flame retardant.
6. The polypropylene composite material according to claim 1, wherein the intumescent flame retardant is ammonium polyphosphate and/or melamine polyphosphate; the phosphate ester is
Wherein R is1Represents a hydrogen atom or an alkyl group, R2Represents an alkyl group; the aperture of the molecular sieve is 3-5 nm, and the specific surface area is 400-700 m2(ii)/g; the water content of the toluene is less than or equal to 100 ppm.
7. The polypropylene composite of claim 6, wherein R in the phosphate ester is1And R2The number of carbon atoms in the middle alkyl group is 1 to 18.
8. The polypropylene composite material according to claim 1, wherein the flame retardant is prepared by a method comprising: dispersing the intumescent flame retardant in toluene, then adding phosphate, trifluoroacetic acid and a molecular sieve, stirring at 100 ℃, then removing the molecular sieve, and sequentially filtering and drying the remaining mixture to obtain the flame retardant.
9. A method of making a polypropylene composite comprising:
weighing the polypropylene, the flame retardant, the char forming agent, the toughening agent, the maleic anhydride grafted polypropylene, the antioxidant, the lubricant, the anti-dripping agent and the toner according to the parts by weight of the components in the claim 1, and uniformly mixing;
and feeding the mixed raw materials into a double-screw extruder from a main feeding port, feeding glass fibers into the double-screw extruder from a side feeding port, and extruding and granulating to obtain the polypropylene composite material.
10. Use of the polypropylene composite according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011320162.5A CN112321945B (en) | 2020-11-23 | 2020-11-23 | Precipitation-resistant halogen-free flame-retardant polypropylene composite material and preparation method thereof |
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| CN202011320162.5A CN112321945B (en) | 2020-11-23 | 2020-11-23 | Precipitation-resistant halogen-free flame-retardant polypropylene composite material and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN114316428A (en) * | 2021-12-17 | 2022-04-12 | 上海金发科技发展有限公司 | Halogen-free flame-retardant polypropylene composition and preparation and application thereof |
| CN117050426A (en) * | 2023-08-21 | 2023-11-14 | 广东科净塑料制品有限公司 | Flame-retardant and wear-resistant PP composite material and preparation process thereof |
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