CN110903552B - High-flame-retardant modified polypropylene and preparation method thereof - Google Patents
High-flame-retardant modified polypropylene and preparation method thereof Download PDFInfo
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Abstract
The invention provides high-flame-retardant modified polypropylene which comprises the following components in parts by weight: 45-60 parts of polypropylene resin; 15-25 parts of an inorganic filler; 20-30 parts of a flame retardant; 0.1-0.4 part of antioxidant; 0.1-0.4 part of light stabilizer; 0.1-0.2 part of ultraviolet absorbent, and the high-flame-retardant modified polypropylene also contains zinc element. The invention also provides a preparation method of the modified polypropylene, and the 5VA flame retardant PP composite material can be obtained by controlling the content of the zinc element in the modified polypropylene to be 100-210 ppm, so that the use amount of the corresponding flame retardant is reduced.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to high-flame-retardant modified polypropylene and a preparation method thereof.
Background
Polypropylene has a series of advantages of low density, heat resistance, corrosion resistance and the like, and is widely applied in the fields of energy, chemical industry, automobiles, household appliances and the like. However, polypropylene also has its own disadvantages, such as poor flame retardant properties, easy aging, etc., so it is necessary to modify polypropylene to improve its flame retardant properties and weather resistance.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a high flame retardant modified polypropylene.
The second purpose of the invention is to provide a preparation method of the high flame retardant modified polypropylene.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention relates to high-flame-retardant modified polypropylene which comprises the following components in parts by weight:
the high-flame-retardant modified polypropylene also contains zinc element, and the weight content of the zinc element is 100 ppm-210 ppm based on the total weight of the high-flame-retardant modified polypropylene.
Preferably, the zinc element is derived from a zinc-containing compound selected from at least one of zinc oxide, zinc sulfate, zinc nitrate, zinc sulfite, and zinc chloride.
Preferably, the polypropylene resin is copolymerized polypropylene, the melt index is 10-25 g/10min at the temperature of 230 ℃ and under the load of 2.16kg, and the impact strength is 20-45 KJ/m2。
Preferably, the inorganic filler is selected from at least one of sepiolite, chlorite, kaolin, montmorillonite and diatomite.
Preferably, the flame retardant is an organic flame retardant and/or an inorganic flame retardant, the organic flame retardant is preferably a halogen flame retardant, and the organic flame retardant is at least one selected from decabromodiphenylethane, tetrabromobisphenol A and bromotriazine; the inorganic flame retardant is selected from at least one of antimony trioxide, zinc oxide, antimony chloride and antimony bromide;
preferably, a compound flame retardant containing the organic flame retardant and the inorganic flame retardant is used, wherein the mass ratio of the organic flame retardant to the inorganic flame retardant is (3-4): 1.
Preferably, the antioxidant comprises a main antioxidant and an auxiliary antioxidant, and the main antioxidant is antioxidant 1010 and/or antioxidant 1076; the auxiliary antioxidant is phosphite antioxidant 168 and/or antioxidant DLTP;
preferably, the mass ratio of the main antioxidant to the auxiliary antioxidant is (1-2) to 1.
Preferably, the light stabilizer is a hindered amine light stabilizer, preferably a UV 3853 light stabilizer.
Preferably, the ultraviolet light absorber is a benzotriazole ultraviolet light absorber, preferably an ultraviolet light absorber UV 326.
Preferably, the high-flame-retardant modified polypropylene further comprises 0.5-1 part of other additives, and the other additives are selected from at least one of a lubricant, an anti-dripping agent and a heat stabilizer.
The invention also relates to a preparation method of the high-flame-retardant modified polypropylene, which comprises the steps of uniformly mixing the components and granulating to obtain the high-flame-retardant modified polypropylene.
Preferably, the mixing is carried out by a high-speed mixer, and the mixing time is 8-10 minutes.
Preferably, the granulation is carried out by a double-screw extruder, and the extrusion processing temperature is 170-215 ℃.
The invention has the beneficial effects that:
the invention provides high-flame-retardant modified polypropylene and a preparation method thereof, aiming at the problems that the existing polypropylene material has poor flame-retardant property and is easy to age, and the halogen flame retardant is added to reach the flame-retardant standard. By controlling the content of the zinc element in the modified polypropylene to be 100-210 ppm, the 5VA flame-retardant PP composite material can be obtained, and the use amount of the corresponding flame retardant is reduced.
In the preferable scheme of the invention, the weather resistance of the modified polypropylene can be improved by preferably selecting the composite antioxidant, the ultraviolet absorbent and the light stabilizer. Specifically, after a xenon lamp aging test of 2500h, the tensile strength of the modified polypropylene is maintained above 90%, the elongation at break is maintained above 70%, and the impact strength is maintained above 80%.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The embodiment of the invention relates to high-flame-retardant modified polypropylene which comprises the following components in parts by weight:
as the halogen flame retardant is easy to generate toxic substances during combustion, and the price of the halogen flame retardant is continuously increased along with the tightening of the environmental protection policy, the addition amount of the halogen flame retardant in the modified polypropylene needs to be reduced. In order to ensure that the product still achieves the flame retardant standard, the modified polypropylene also contains zinc element. The weight content of the zinc element is 100ppm to 210ppm based on the total weight of the high flame-retardant modified polypropylene. Zn is difficult to be volatilized when the addition amount is less than 100ppm2+However, when the amount of the zinc element added exceeds 210ppm, the effect of the original flame retardant is inhibited.
In one embodiment of the present invention, the zinc element is derived from a zinc-containing compound, and the zinc-containing compound may be at least one selected from zinc oxide, zinc sulfate, zinc nitrate, zinc sulfite, and zinc chloride. The addition amount of the zinc-containing compound in the modified polypropylene provided by the invention is 0.01-0.05 weight part. Because the zinc-containing compound is added in a smaller amount compared with other raw material components, in order to improve the dispersibility of the zinc-containing compound in a product, the zinc-containing compound is loaded on the inorganic filler by a hydrothermal method.
In one embodiment of the invention, the zinc-containing compound and the inorganic filler are placed in a solvent for hydrothermal reaction, the temperature of the hydrothermal reaction is 150-200 ℃, the time is 4-6 hours, and the solvent is water or ethanol. And after the reaction is finished, centrifuging or filtering to obtain a reaction product, drying by a vacuum oven, and grinding and dispersing to obtain the inorganic filler loaded with the zinc-containing compound. And then mixing the inorganic filler loaded with the zinc-containing compound with other raw material components to prepare the modified polypropylene. To determine the elemental zinc content of the product, the sample can be digested with microwaves and then the content can be determined by flame atomic absorption spectroscopy.
In one embodiment of the present invention, the polypropylene resin is a co-polypropylene having a melt index of 10 to 25g/10min at 230 ℃ and a load of 2.16kg and an impact strength of 20 to 45KJ/m according to ISO 11332。
The polypropylene resin having the above melt index (abbreviated as melt index) has a high loading. If the melt index is lower than the range, the polypropylene flows too slowly in the extrusion granulation process, and is difficult to be uniformly dispersed in other materials, and uniform and stable material particles cannot be formed. But the melt index cannot be too high based on the consideration of flame retardant property, and a finished product made of polypropylene with too high melt index is easy to burn through when a 5VA square plate test is carried out, and cannot reach the flame retardant grade of 5 VA.
The use of such an impact strength polypropylene resin is based on the demands of practical use. Because the compatibility of the filler and the polypropylene resin is not good, the impact strength of the polypropylene resin is greatly reduced after modification. If the polypropylene with the impact strength lower than the impact strength is selected, the impact strength of a modified finished product is lower, and the problems of cracking and brittle fracture are easy to occur in practical application. However, the pursuit of too high an impact strength is not desirable either, and causes deterioration of other properties.
In one embodiment of the present invention, the inorganic filler may be selected from at least one of sepiolite, chlorite, kaolin, montmorillonite, and diatomaceous earth. The addition of the inorganic filler can improve the heat resistance and rigidity, and the tensile strength and flexural strength of the polypropylene resin.
Wherein, the sepiolite is a hydrous magnesium silicate clay mineral; chlorite, kaolin, montmorillonite and diatomaceous earth are layered aluminosilicate minerals. The inorganic filler has a layered structure, widely has isomorphous phenomenon, and is convenient for Zn2+Replacement of (2). Thereby leading the material to show unique flame retardant property.
In one embodiment of the present invention, the flame retardant may be selected from organic flame retardants and/or inorganic flame retardants. The organic flame retardant mainly comprises organic substances, including halogen flame retardants, phosphate flame retardants and the like, and the invention preferably selects the halogen flame retardants, specifically at least one selected from decabromodiphenylethane, tetrabromobisphenol A and bromotriazine. The inorganic flame retardant mainly comprises inorganic substances, specifically at least one selected from antimony trioxide, zinc oxide, antimony chloride and antimony bromide.
In a preferred embodiment of the invention, a compound flame retardant containing an organic flame retardant and an inorganic flame retardant is used, so that a synergistic flame retardant effect can be achieved. Wherein the mass ratio of the organic flame retardant to the inorganic flame retardant is (3-4) to 1. Taking the compounding of a halogen flame retardant and antimony trioxide as an example to illustrate the mechanism of compounding flame retardance, the processes (1) to (5) are shown as follows:
(1) when the halogen flame retardant burns in fire, the halogen flame retardant absorbs heat and decomposes to release hydrogen halide, and the process can absorb heat and reduce the temperature, thereby reducing the oxygen concentration.
(2) Reaction of hydrogen halide with antimony trioxide to form SbX3Can coat combustible materials and isolate oxygen. The reaction formula is HX + Sb2O3→SbX3。
(3)SbX3Reacting with water to generate antimony oxide, which can capture free radicals,the chain reaction was stopped. The reaction formula is SbX3+H2O→SbOx+2HX。
(4) At 250-285 ℃, the antimony oxide is decomposed, can absorb heat and reduce the temperature, and coats combustible materials. The reaction formula is 5SbOx→Sb4O5X2+SbX3。
(5) When the temperature is above 500 ℃, the product is continuously decomposed. Reaction formula is Sb4O5X2→2SbX3+5Sb3O2。
If a single flame retardant is used, the flame retardancy may be reduced with the same amount of the flame retardant. If it is desired to achieve the same flame retardant rating, more flame retardant portions need to be added.
The antioxidant acts to retard or inhibit the polymer oxidation process, thereby preventing polymer aging and extending its useful life, and helps to prevent polymer degradation under high temperature and high pressure conditions. The antioxidant comprises a primary antioxidant and a secondary antioxidant. The main function of the main antioxidant is to protect the plastic products in future use; the auxiliary antioxidant mainly plays a role in protecting the plastic in the links of granulation, injection molding processing and the like. The mechanisms of the antioxidant action of the two are different, and the specific mechanisms are as follows:
the anti-aging mechanism of the main antioxidant is as follows: active peroxy radicals generated by the autoxidation reaction are captured and eliminated, and are converted into hydroperoxide, thereby achieving the purpose of preventing the autoxidation reaction. The primary antioxidant is also known as a chain terminator.
The anti-aging mechanism of the auxiliary antioxidant is as follows: when the main antioxidant plays a role, the generated hydroperoxide is extremely sensitive to the action of light, heat and the like, and is easy to generate homolytic cleavage, and free radicals are generated to reinitiate the autoxidation reaction. Secondary antioxidants, also known as hydroperoxide decomposers, convert hydroperoxides into stable substances. The auxiliary antioxidant is added independently without antioxidant effect, and has antioxidant effect only when being added together with the main antioxidant.
In one embodiment of the invention, the primary antioxidant is antioxidant 1010 and/or antioxidant 1076; the auxiliary antioxidant is phosphite antioxidant 168 and/or antioxidant DLTP. Wherein the chemical name of the antioxidant 1010 is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester. The chemical name of the antioxidant 1076 is octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate or n-octadecyl 3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate. The chemical name of the antioxidant 168 is tris (2, 4-di-tert-butylphenyl) phosphite, which is an excellent phosphite-based antioxidant, and has excellent synergistic effects when used in combination with the primary antioxidants 1010 and 1076. The chemical name of the antioxidant DLTP is dilauryl thiodipropionate.
In a preferred embodiment of the invention, the mass ratio of the primary antioxidant to the secondary antioxidant is (1-2): 1.
In one embodiment of the present invention, the light stabilizer is a hindered amine light stabilizer. Preferred is a UV 3853 light stabilizer, which is chemically known as 2,2,6, 6-tetramethyl-4-piperidyl stearate. It is suitable for most polymers and has excellent properties in terms of color stability, gloss retention and durability.
In one embodiment of the present invention, the ultraviolet light absorber is a benzotriazole-based ultraviolet light absorber. The ultraviolet light absorbent UV 326 is preferably selected, has the chemical name of 2'- (2' -hydroxy-3 '-tert-butyl-5' -methylphenyl) -5-chlorobenzotriazole, has the advantages of stable performance, low toxicity and strong ultraviolet light absorption capacity, has better compatibility with various resins, and can effectively absorb ultraviolet light with the wavelength of 270-380 nm.
Further, the high-flame-retardant modified polypropylene further comprises 0.5-1 part of other additives, and the other additives are selected from at least one of a lubricant, an anti-dripping agent and a heat stabilizer. Wherein the lubricant can be Ethylene Bis Stearamide (EBS) or paraffin; the anti-drip agent may be Polytetrafluoroethylene (PTFE); the heat stabilizer may be at least one selected from calcium stearate, zinc stearate, and methyl tin mercaptide.
The invention also relates to a preparation method of the high flame-retardant modified polypropylene, which comprises the steps of adding the components, namely the polypropylene resin, the inorganic filler loaded with the zinc-containing compound, the flame retardant, the antioxidant, the light stabilizer and the ultraviolet absorber, and optionally adding other auxiliary agents, uniformly mixing, granulating, and drying to obtain the high flame-retardant modified polypropylene.
In one embodiment of the invention, the mixing is carried out by a high-speed mixer, and the mixing time is 8-10 minutes. The high-speed mixer generally refers to a high-speed mixer in the plastic industry, and is suitable for mixing and stirring materials such as powder, particles, auxiliaries, toner, color masterbatch and plastics. The barrel body is of an arc structure, and the special blade structure is mainly utilized to enable materials to form vortex-shaped high-speed stirring and be heated and modified.
In one embodiment of the invention, the granulation is carried out by a double-screw extruder, and the extrusion processing temperature is 170-215 ℃.
Examples of the experiments
Pouring the resin and other auxiliary materials into a high-speed mixer to mix for 8-10 minutes, and then granulating by using a double-screw extruder, wherein the extrusion processing temperature is 170-215 ℃. The component ratios of the examples and comparative examples are shown in tables 1 and 2. The polypropylene manufacturer is Guangzhou petrochemical and has a mark of 9026H.
Test example
And transferring the particles prepared in the examples and the comparative examples into an injection molding machine, and performing injection molding at 180-230 ℃ to obtain tensile, bending and impact sample bars.
Wherein, the length of the tensile sample strip is 150 +/-2 mm, the width is 10 +/-0.2 mm, and the thickness is 4 +/-0.2 mm.
The length of the curved sample strip is 80 + -2 mm, the width is 10 + -0.2 mm, and the thickness is 4 + -0.2 mm.
The length of the impact specimen is 80 + -2 mm, the width is 10 + -0.2 mm, the thickness is 4 + -0.2 mm, and the residual width of the gap is 8 + -0.2 mm.
The length of the flame-retardant sample strip is 125 +/-5 mm, the width of the flame-retardant sample strip is 13 +/-0.5 mm, and the thickness of the flame-retardant sample strip is 2.0 +/-0.1 mm.
The length of the flame-retardant square plate is 150 +/-5 mm, the width of the flame-retardant square plate is 150 +/-5 mm, and the thickness of the flame-retardant square plate is 2.0 +/-0.1 mm.
And testing the mechanical properties of the sample strips and the square plates according to the national standard. Before testing, the test specimens were first placed in an environment at a temperature of 23. + -. 2 ℃ and a humidity of 50. + -. 10% for 88 h. The test results are shown in tables 1 and 2.
The content of zinc in the obtained particles is measured by adopting the following method: accurately weighing 0.2g of the crushed sample, adding the crushed sample into a polytetrafluoroethylene digestion tank, adding 5ml of concentrated nitric acid, 2ml of perchloric acid and 2ml of hydrogen peroxide, covering the tank, putting the tank into a microwave digestion furnace, and heating for 3 minutes. Cooling to room temperature, opening the cover, filtering the digestive juice to a 100ml beaker by using a membrane with the pore diameter of 0.45 mu m, washing the digestion tank by using water for several times, combining the washing liquid and the digestive juice, heating to be nearly dry by using a water bath, cooling, transferring to a volumetric flask, diluting to a scale by using a 1% nitric acid solution, and uniformly shaking to a constant volume for later use while making a reagent blank. The zinc content of the tester was then tested by flame atomic absorption spectroscopy.
TABLE 1
In examples 1-7 and comparative examples 1 and 2, the inorganic filler is montmorillonite; the flame retardant is prepared by compounding decabromodiphenylethane and antimony trioxide, and the mass ratio of the decabromodiphenylethane to the antimony trioxide is 3.3: 1; the antioxidant is compounded by 1076 and DLTP, and the mass ratio of the two is 2: 1; the light stabilizer is UV 3853; UV 326 is selected as the ultraviolet absorbent; other auxiliary agents are 0.4 part of lubricant EBS, 0.3 part of anti-dripping agent PTFE and 0.3 part of heat stabilizer calcium stearate respectively.
The formulations of comparative examples 3 to 7 are substantially the same as in example 6, except that: in comparative example 3 decabromodiphenylethane was used as a single flame retardant; comparative example 4 a single antioxidant 1076 was used; comparative example 5 only zinc-containing compound was added without inorganic filler; comparative example 6 no other auxiliary agents were used; comparative example 7 did not use an antioxidant, a light stabilizer and an ultraviolet absorber. The test results are shown in Table 2.
TABLE 2
In each of the examples and comparative examples, the detailed selection of each component is not limited, and those skilled in the art can make the selection according to the summary of the invention. The test results were analyzed as follows:
as can be seen from example 1 and example 2: there is an optimum range for the zinc content of the zinc containing compound to achieve a 5VA flame retardant rating. The optimal range is 100-210 ppm, and if the content is not in the range, the flame retardant effect is obviously poor. The related mechanism may be that the content is low and Zn is difficult to be volatilized2+The content of the flame retardant is too high, which can inhibit the original flame retardant effect from being exerted.
As can be seen from examples 3 to 7: with the addition of the zinc-containing compound, the requirement of 5VA flame retardant grade can be met under the condition that the same amount of the flame retardant is 22 parts. That is, with the addition of the zinc-containing compound, the amount of the flame retardant to be used can be reduced under the same flame retardant rating. The mechanism involved may be Zn2+The existence of the intermediate ring has the functions of resisting oxygen or capturing free radicals, promoting intermediate ring closure and having good carbon forming function.
Specifically, the inorganic filler selected by the invention has a layered structure, has a lamellar barrier effect, and has a synergistic effect with a flame retardant. A carbon protective layer is formed on the surface of the polypropylene resin in the combustion process to isolate the oxygen from entering, so that oxygen deficiency in the polypropylene resin matrix is caused. At this time, the polypropylene resin is cracked to produce partial combustible olefin and alkane products, and Zn is formed2+Under the catalytic action of (3), the hydrocarbon product is subjected to aromatic cyclization by dehydrogenation, and the aromatic ring is further subjected to catalytic dehydrogenation to form carbon. After the process is finished, the carbon skeleton layers are mutually and alternately penetrated to form a stable carbon layer network, and the flame retardant effect of the carbon layer network is improved from the outside to the inside. The reaction process is as follows:
it can be seen from comparative examples 1 and 2 that it is difficult to use 22 parts of flame retardant to achieve a flame retardant rating of 5VA with the same parts of polypropylene. Therefore, the flame retardant amount needs to be increased to 24 parts to meet the 5VA flame retardant grade. However, with the increase of the amount of the flame retardant, the mechanical properties of the material are obviously reduced, most obviously, the elongation at break and the impact strength of the material are reduced. The reduction is about 55% and 35% respectively compared with the comparison example 1.
As can be seen from comparative example 3, in the case of using decabromodiphenylethane as a single flame retardant, the flame retardant properties were seriously degraded, and the specimens dropped and the square plate burned through during the test. Under the condition of lacking of antimony oxide for synergistic flame retardance, the decabromoflame retardant only can be flame-retarded by virtue of a gas phase, and is single in effect and difficult to reach a 5VA flame-retardant grade.
From comparative example 4, it can be seen that the elongation at break and impact strength of the material are reduced significantly compared to example 6, by nearly 40% and 30%, respectively, in the case of using a single primary antioxidant 1010. After the weather resistance test of 2500h, the retention rate of the elongation at break and the impact strength of the material are also partially reduced compared with example 6. This is because, in the absence of the secondary antioxidant, the material is susceptible to decomposition by the shearing heat of the screw during the granulation and proofing processes, thereby reducing the toughness of the material.
As can be seen from the comparative example 5, the problem of poor compatibility between the polypropylene base material and the inorganic filler is avoided only by using the zinc-containing compound without the filler, so that the mechanical properties of the material are greatly improved. However, the reduction of the inorganic filler results in a serious decrease in flame retardancy. The inorganic filler is difficult to burn, and the inorganic filler is of a lamellar structure and has a lamellar barrier effect, so that the inorganic filler has a certain flame retardant effect.
From comparative example 6, it can be seen that in the absence of lubricants, heat stabilizers and anti-dripping agents, the material has a large deterioration in properties, with a significant decrease in strength, toughness and melt index. In the extrusion granulation process, the particles have foaming phenomenon under the same process parameters. This is due to the lack of lubricants and heat stabilizers, and the decomposition of part of the flame retardant under the twin-screw shearing action.
As can be seen from comparative example 7, the weather resistance of the modified polypropylene was seriously deteriorated in the absence of the antioxidant, light stabilizer and ultraviolet absorber. The retention rate of tensile strength is only 63%, and the retention rates of elongation at break and impact strength are about 25%, which seriously affects the use of the composite material.
As can be seen from tables 1 and 2, the weathering resistance of the flame-retardant polypropylene is greatly improved by the preferred selection of the antioxidant, the light stabilizer and the ultraviolet absorber. The PP material containing zinc compounds and meeting the 5VA flame retardance has the retention rate of tensile strength of more than 90%, the retention rate of elongation at break of 70% and the retention rate of impact strength of more than 80%. The excellent weather resistance greatly expands the application range of the flame-retardant polypropylene. The polypropylene obtained by the formulations of examples 6 and 7 can give consideration to both flame retardancy and weather resistance in combination with the consideration of the comprehensive factors such as the performance and cost of the material.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. The high-flame-retardant modified polypropylene is characterized by comprising the following components in parts by weight:
45-60 parts of polypropylene resin;
15-25 parts of an inorganic filler;
20-30 parts of a flame retardant;
0.1-0.4 part of antioxidant;
0.1-0.4 part of light stabilizer;
0.1-0.2 parts of ultraviolet absorbent;
the inorganic fillers each have a layered structure;
the antioxidant comprises a main antioxidant and an auxiliary antioxidant, and the main antioxidant is an antioxidant 1010 and/or an antioxidant 1076; the auxiliary antioxidant is phosphite antioxidant 168 and/or antioxidant DLTP; the mass ratio of the main antioxidant to the auxiliary antioxidant is (1-2) to 1;
the light stabilizer is a hindered amine light stabilizer, and the ultraviolet absorbent is a benzotriazole ultraviolet absorbent;
the high-flame-retardant modified polypropylene also contains zinc element, and the weight content of the zinc element is 100-210 ppm based on the total weight of the high-flame-retardant modified polypropylene;
the high-flame-retardant modified polypropylene further comprises 0.5-1 part of other additives, wherein the other additives are a lubricant, an anti-dripping agent and a heat stabilizer.
2. The modified polypropylene according to claim 1, wherein the zinc element is derived from a zinc-containing compound selected from at least one of zinc oxide, zinc sulfate, zinc nitrate, zinc sulfite, and zinc chloride.
3. The modified polypropylene according to claim 1, wherein the polypropylene resin is a copolymer polypropylene having a melt index of 10 to 25g/10min at 230 ℃ and under a load of 2.16kg, and an impact strength of 20 to 45KJ/m2；
And/or the inorganic filler is selected from at least one of sepiolite, chlorite, kaolin, montmorillonite and diatomite.
4. The modified polypropylene according to claim 1, wherein the flame retardant is an organic flame retardant and/or an inorganic flame retardant, and the organic flame retardant is a halogen-based flame retardant selected from at least one of decabromodiphenylethane, tetrabromobisphenol A, and bromotriazine; the inorganic flame retardant is selected from at least one of antimony trioxide, zinc oxide, antimony chloride and antimony bromide;
and/or a compound flame retardant containing the organic flame retardant and the inorganic flame retardant is used, wherein the mass ratio of the organic flame retardant to the inorganic flame retardant is (3-4): 1.
5. The modified polypropylene of claim 1, wherein the light stabilizer is UV 3853 and the ultraviolet absorber is UV 326.
6. The method for preparing modified polypropylene according to any one of claims 1 to 5, wherein the method comprises the steps of uniformly mixing the components and granulating to obtain the high flame retardant modified polypropylene.
7. The method according to claim 6, wherein the mixing is performed by a high speed mixer for 8 to 10 minutes.
8. The method according to claim 6, wherein the granulation is performed by a twin-screw extruder, and the extrusion processing temperature is 170-215 ℃.
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