CN114106455A - Thermo-oxidative aging resistant polypropylene composition and preparation method thereof - Google Patents
Thermo-oxidative aging resistant polypropylene composition and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a thermal-oxidative-aging-resistant polypropylene composition and a preparation method thereof, belonging to the technical field of polypropylene modification. The thermal-oxidative-aging-resistant polypropylene composition comprises the following raw materials in parts by mass: 100 parts of polypropylene, 8-25 parts of mLLDPE, 0.8-3 parts of nano Boron Nitride (BN), 0.3-1 part of polyethylene glycol (PEG), 0.05-0.2 part of coupling agent, 0.05-0.4 part of phenol antioxidant, 0.05-0.5 part of thioester antioxidant, 0.05-0.4 part of phosphate antioxidant, 0.02-0.1 part of acid acceptor and 0.02-0.08 part of antistatic agent. The polypropylene composition with thermal-oxidative aging resistance has good thermal-oxidative aging resistance, impact resistance, dimensional stability and more excellent mechanical property; the invention also provides a simple and feasible preparation method.
Description
Technical Field
The invention relates to a thermal-oxidative-aging-resistant polypropylene composition and a preparation method thereof, belonging to the technical field of polypropylene modification.
Background
Polypropylene (PP) is a typical crystalline polymer, has the advantages of heat resistance, corrosion resistance, small density, light weight and the like, and is widely applied to injection molding parts, biaxial stretching films, fibers, pipes, automobiles, electric appliances and the like. The PP is more active due to the methyl induction effect because the carbon atom of the main chain skeleton connected with the side methyl is a tertiary carbon atom, so that the polypropylene is more easily influenced by external environmental factors such as processing temperature, oxygen, light, pollutants in air and the like, is broken and is aged and degraded compared with polyethylene. Such as yellowing, a decrease in relative molecular weight, cracking of the surface of the product, loss of gloss, and more seriously, a drastic decrease in mechanical properties such as impact strength and tensile strength, resulting in a great waste of materials. The waste products are difficult to degrade under natural conditions, and further cause environmental pollution, so that the method for improving the thermo-oxidative aging resistance of PP to prolong the service life of PP products through various modifications becomes a research hotspot at home and abroad.
At present, the main methods for improving and enhancing the thermal-oxidative aging performance of PP comprise:
(1) physical protection (such as thickening, coating, outer layer compounding and the like), but the methods have some defects of increasing processes or influencing the appearance of products and the like, and are only limited to the application of a few products;
(2) the processing technology is improved, the method can only be implemented from the preparation source of the material, and the aging problem of the material in the reprocessing and using processes cannot be solved;
(3) the structural design or modification of the high polymer material is that through the molecular structural design of the material, a group which is not easy to age replaces a group which is easy to age, so that a good effect can be achieved, or a functional group or a structure with an anti-aging effect is introduced on a high polymer chain through a grafting or copolymerization method, so that the material is endowed with an excellent anti-aging function, but the cost is high, the difficulty is high, and the large-scale production and application cannot be realized temporarily;
(4) the durability of the product is influenced by adding an organic ultraviolet absorbent which is an organic substance and is also damaged by ultraviolet rays, and a plurality of ultraviolet absorbents can absorb visible light with certain wavelength, so that the product has yellow or other colors and the appearance performance of the product is influenced;
(5) adding an inorganic filler: inorganic filler systems are mainly of two types: the general scale-like talc and spherical calcium carbonate, which have a low aspect ratio, and the other class of fillers having a high aspect ratio, such as: bamboo fiber, carbon fiber, glass fiber and other materials. The talcum powder and calcium carbonate have low material size stability at certain content, and the talcum powder can strongly adsorb the stabilizer in the resin, so that the stability of the stabilizer in the resin is obviously reduced, and the like. The bamboo fiber is not mature as a filler, the carbon fiber has extremely high cost, the glass fiber can be used as a reinforcing agent, the rigidity of the material is obviously improved, and the material also has excellent heat resistance and dimensional stability, but the surface smoothness and the aesthetic property are poor, large-size interior parts are easy to warp and deform, and the application fields are limited by the industry.
Chinese patent CN 110218388A discloses a method for manufacturing an ultraviolet-proof and anti-aging polypropylene master batch, which increases the compatibility of polypropylene and mineral filler by grafting maleic anhydride onto polypropylene, and the method has the disadvantages of complex preparation, high toxicity of maleic anhydride compatilizer and difficulty in popularization and use.
Chinese patent CN103382274A discloses a granular mixture of 5-10 parts of processing aid, 20-40 parts of long-acting antioxidant, 10-30 parts of antioxidant, 10-20 parts of nucleating agent, 10-30 parts of stearate, 5-20 parts of superfine talcum powder and the like through melt granulation. The antioxidant is used in a large amount, but the actual ageing resistance is not good.
Disclosure of Invention
The invention aims to solve the technical problems that the defects in the prior art are overcome, and the thermal-oxidative-aging-resistant polypropylene composition has good thermal-oxidative-aging resistance, impact resistance, dimensional stability and better mechanical property; the invention also provides a simple and feasible preparation method.
The thermal-oxidative-aging-resistant polypropylene composition comprises the following raw materials in parts by mass:
the polypropylene is homo-polypropylene or random copolymerization polypropylene (PP) powder, the melt Mass Flow Rate (MFR) of the polypropylene is 10-40g/10min, the MFR test condition is 230 ℃ and 2.16kg, and the isotacticity of the homo-polypropylene is 97-99%; the comonomer of the random copolymerization polypropylene is ethylene, and the mass percent of the ethylene is 1.5 to 4 percent, preferably 2.6 to 3.3 percent. The weight average relative molecular weight of the homo-polypropylene or the random copolymerization polypropylene tested by the GPC method is 20-35 ten thousand, the number average molecular weight is 4-5 ten thousand, and the weight distribution is 4-8. The melting point of the homopolymerized polypropylene is 150-160 ℃, and the melting point of the random copolymerization polypropylene resin is 140-150 ℃. The melting point of the resin was measured using a differential scanning calorimeter.
The metallocene linear low density polyethylene mLLDPE is a binary copolymer produced by ethylene and alpha-olefin (such as 1-butene, 1-hexene, 1-octene, tetramethyl-1-pentene and the like) on a gas phase process device under the action of a metallocene catalyst. The melt mass flow rate (MFR2.16) is 0.6-2.5g/10min, and the density is 0.913-0.928g/cm3(ii) a The molecular weight distribution Mw/Mn is between 2.4 and 3.6, and the weight average molecular weight is 10 to 15 ten thousand. The comonomer is preferably hexene-1, and the mass percentage of the comonomer hexene is 0.5-3%. The powder with smaller particle size is adopted, the smaller the particle size is, the more uniform the dispersion is, and the stronger the toughening effect on PP is. The polypropylene composite material replaces conventionally used elastomers such as rubber or POE, is low in price, has a melting point and a thermal deformation temperature higher than those of POE, has certain strength and toughness, is low in crystallinity, can improve the shrinkage rate of PP resin, solves the problem of reduction of heat resistance of materials caused by a common toughening agent, and is used in an amount of 8-25 parts, preferably 10-20 parts.
Many uv absorbers absorb visible light at a wavelength that imparts a yellow or other color to the article, affecting the appearance of the article, and are organic in nature and can be attacked by uv light, thereby affecting the durability of its use. The nanometer boron nitride has strong ultraviolet absorption capability and can better overcome the defects of organic ultraviolet agents. Its absorption of ultraviolet light results from its semiconducting properties, which absorbs the energy of an excitation photon when it is above the band gap energy of the semiconductor. The strength, rigidity and dimensional stability of the material can be greatly improved, and simultaneously, the product still has good surface smoothness and aesthetic property.
The nanometer boron nitride is a new inorganic white powder, and because the size of the particle is equivalent to or smaller than that of light wave, the nanometer boron nitride can produce size effect, so that the nanometer boron nitride has stronger light absorption capacity and simultaneously has better ultraviolet shielding and scatteringAnd (5) effect. The action principle is as follows: acts as a barrier between the light radiation and the polymer, blocking the direct radiation of light into the interior of the polymer, thereby effectively mitigating photooxidative degradation of the polymer. It can raise the crystallization temperature of polypropylene material, increase the number of spherulites and reduce the size of spherulites, and has excellent heat conductivity and chemical stability. The purity of the powder is 99%, the particle size is 1-100nm, preferably 20-60nm, the crystal structure has similar graphite lamellar structure, and the BET specific surface area is 50-100m2(ii)/g, aspect ratio of 13:1, and is a white powder exhibiting properties of looseness, lubrication, moisture absorption, light weight, and the like. Theoretical density 2.27g/cm3The Mohs hardness is 2. The amount thereof is 0.8 to 3 parts, preferably 1.0 to 2.0 parts.
The nano boron nitride has large specific surface area and high surface energy, is directly added in a powder form, is easy to float, causes certain difficulty in accurate metering, is easy to agglomerate, is difficult to be directly and uniformly dispersed in a PP powder matrix, is difficult to play a role to the maximum extent, and has poor product quality stability. But the polarity of the surface of the nano boron nitride modified by the polyethylene glycol is reduced, the nano boron nitride is more matched with the polarity of a polymer matrix, the dispersity of the nano boron nitride in a PP powder matrix is obviously enhanced, and the nano boron nitride is efficiently mixed with PP resin, so that the nano boron nitride is uniformly dispersed in the PP powder resin.
The polyethylene glycol is white granular powder, the powder purity is 98%, the analysis is pure, and the melting point is 55-60 ℃. The amount is 0.3-1 part, preferably 0.45-0.75 part. The molecular weight is between 2000 and 3000, and the molecular weight is preferably between 2050 and 2650. It is soluble in alcohol, ketone, chloroform, etc., and is compatible with many substances with higher polarity. When the ratio of the nano boron nitride to the polyethylene glycol is (1-4): the value of 1 is most preferable.
The coupling agent is one of silane coupling agent, titanate coupling agent or aluminate coupling agent. Titanate coupling agents are preferred. The amount is 0.05-0.2 part, preferably 0.06-0.11 part.
The antioxidant is a mixture of three, wherein the phenolic antioxidant can be [3- (3, 5-bi-tert-butyl-4-hydroxycyclohexyl) propionate ] (1010), [1,3, 5-tri (3, 5-di-tert-butyl, 4-hydroxybenzyl) s-triazine, 2,4,6- (1H,3H,5H) trione ] (3114), or [3,3,3,5,5, 5-hexa-tert-butyl-a, a, a- (1,3, 5-trimethylbenzene-2, 4, 6-triyl) tri-p-cresol ] (1330), preferably 1010 antioxidant in the invention, the weight portion is 0.05-0.4 part, preferably 0.09-0.15 part; as the phosphate antioxidant, there can be used [ tris (2, 4-di-t-butylphenyl) phosphite ] (168), [ bis (2, 4-di-t-butylphenol) pentaerythritol diphosphite ] (622), [ bis (2, 6-di-t-butyl-4-methylphenyl) pentaerythritol diphosphite ] (PEP36), etc., and 168 is preferable from the viewpoint of antioxidant performance and yellow index. The weight portion of the antioxidant is 0.05-0.4 portion, preferably 0.09-0.15 portion.
The hindered phenol main antioxidant belongs to a chain-terminated antioxidant, and achieves the purpose of antioxidation by supplying hydrogen atoms and reacting with free radicals to generate inert products in the process of stabilizing polymers to terminate chain growth. But the result of the hydrogen transfer is the formation of polymer hydroperoxides.
Thioester antioxidant, it can decompose polymer hydroperoxide effectively, make it turn into stable product, thus make the polymer more resistant to thermo-oxidative aging and not discolor, that is to say it has stronger protective function in the aspect of color stability. Generally, the antioxidant is not used independently, and is used as an auxiliary antioxidant to be matched with a hindered phenol main antioxidant.
When the ratio (1-3) of the thioester antioxidant to the phenol antioxidant is 1, a good synergistic effect is generated, the effect of preventing oxidation for a long time is greatly improved, the processing performance of the product is improved, the service life is prolonged, and the product has a good cost performance ratio.
The preferred sulfur ester antioxidant is DLTP (dilauryl thiodipropionate), the molecular weight is 514.86, the melting point is 39.5-41.5 ℃, and the color is white crystal or powder; the fragrance is special sweet and ester-like; the saponification value is 210.5 mg/kg; acidity of 0.098% (based on thiodipropionic acid); the content was 98.0%. The amount is 0.05-0.5 part, preferably 0.25-0.45 part.
The acid absorbent is calcium stearate or zinc stearate and is used for neutralizing residual components of the catalyst in the PP so as to reduce the corrosion of the catalyst to equipment. Preferably calcium stearate, the calcium stearate of the invention has a relative content of calcium element of > 19.6% (measured by fluorescent elemental analysis). The acid scavenger is used in an amount of 0.02-0.1 part, preferably 0.04-0.06 part.
The antistatic agent is Glycerol Monostearate (GMS), the component has an antistatic effect and simultaneously plays a good demoulding role in injection-molded products, and the addition amount is 0.02-0.08 part, preferably 0.03-0.05 part. The thioester antioxidant DLTP has good ester solubility because of having a fatty chain of twelve carbon atoms, so that the addition of the ester antistatic agent can further enhance the dispersion and exert the antioxidant effect.
The preparation method of the polypropylene composition with the thermal-oxidative aging resistance comprises the following steps:
(1) adding a coupling agent into a round-bottom flask, then pouring isopropanol or petroleum ether and acetone, and stirring for 12 minutes by using a magnetic stirrer to dissolve the isopropanol or petroleum ether and acetone; weighing polyethylene glycol, adding the polyethylene glycol into a coupling agent solution, heating and refluxing in a water bath or an oil bath, magnetically stirring for about 15 minutes, then weighing nano boron nitride, adding the nano boron nitride into the coupling agent solution, continuously heating and refluxing, magnetically stirring for about 20 minutes, removing the solvent by using a rotary evaporator, drying the rest solid particles in a vacuum drying oven at 110 ℃, taking out and stirring once every 10 minutes to prevent the solid particles from being layered with the coupling agent solution so as to influence the coupling effect, wherein the obtained powder has a small amount of agglomeration, grinding and crushing the powder by using a vibration mill, and standing for later use after the vibration time is 30-60 minutes;
(2) firstly mixing and stirring the phenol antioxidant and the phosphate antioxidant for 2 minutes, and then adding the polypropylene powder, the metallocene linear low-density polyethylene, the phosphate antioxidant, the acid absorbent, the antistatic agent and the nano boron nitride treated in the step (1); mixing and stirring in a high-speed stirrer; and adding the mixed materials into a double-screw extruder, melting, plasticizing, extruding, granulating and drying to obtain the product.
In the step (2), the mixture is stirred in a high-speed stirrer at a high speed of 500 and 1000 revolutions per minute, preferably 800 revolutions per minute, for 4 to 8 minutes, preferably 6 minutes, and the stirring temperature is 35 to 40 ℃; the length-diameter ratio of the screw is 35-40, and the screw is melted at the temperature of 180-210 ℃; the rotating speed of the extruder host is 150-220 r/min, the feeding rotating speed is 35-50 r/min, and the drying is carried out for 20-35 minutes at the temperature of 60-80 ℃.
According to the invention, the nanometer boron nitride, the polyethylene glycol and the coupling agent are pretreated, so that the nanometer boron nitride and the polyethylene glycol generate a synergistic effect, and the thermo-oxidative aging performance of the product can be effectively enhanced; the invention makes the product easy to store and process, and does not need to change the prior production process, and has low cost.
Compared with the prior art, the invention has the following beneficial effects:
(1) the composition has good thermal oxygen aging resistance and impact resistance, small parallel shrinkage and vertical shrinkage, good dimensional stability and high thermal deformation temperature (0.45 MPa);
(2) by using the formula disclosed by the invention, the PP filling composite material can be endowed with high-efficiency light stability and weather resistance, and the service life of the composite material can be obviously prolonged;
(3) the anti-aging component in the formula disclosed by the invention has excellent dispersibility in PP, high stability and lasting action time, and the anti-aging effect is fully exerted;
(4) the raw materials used in the invention are completely environment-friendly, and the preparation method has simple process and low cost.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the practice of the invention.
Example 1
The thermal-oxidative-aging-resistant polypropylene composition is prepared from the following raw materials in parts by mass:
example 2
The thermal-oxidative-aging-resistant polypropylene composition is prepared from the following raw materials in parts by mass:
example 3
The thermal-oxidative-aging-resistant polypropylene composition is prepared from the following raw materials in parts by mass:
example 4
The thermal-oxidative-aging-resistant polypropylene composition is prepared from the following raw materials in parts by mass:
example 5
The thermal-oxidative-aging-resistant polypropylene composition is prepared from the following raw materials in parts by mass:
the preparation steps of examples 1-5 are as follows:
(1) the coupling agent was added to a round bottom flask, then isopropanol or petroleum ether, acetone was poured in and dissolved by stirring with a magnetic stirrer for 12 minutes. Weighing polyethylene glycol, adding the polyethylene glycol into a coupling agent solution, heating and refluxing in a water bath or an oil bath, magnetically stirring for about 15 minutes, weighing boron nitride, adding the boron nitride into the coupling agent solution, continuously heating and refluxing, magnetically stirring for about 20 minutes, removing the solvent by using a rotary evaporator, drying the rest solid particles in a vacuum drying oven at 110 ℃, taking out and stirring once every 10 minutes to prevent the solid particles from being layered with the coupling agent solution, so that the coupling effect is influenced, a small amount of caking is generated in the obtained powder, grinding and crushing are carried out by a vibration mill, and the powder is reserved after the vibration time is 30 minutes.
(2) And (2) mixing and stirring the antioxidant 1 and the antioxidant 2 for 2 minutes, and then adding the PP powder, the mLLDPE, the antioxidant 3, the acid acceptor, the antistatic agent and the nano boron nitride treated in the step (1). Mixing and stirring at high speed in a high-speed stirrer for 4-8 minutes, wherein the stirring speed is 800 revolutions per minute, and the stirring temperature is 38 +/-2 ℃; and (3) adding the uniformly mixed materials into a double-screw extruder, wherein the length-diameter ratio of a screw is 38, melting, plasticizing, extruding and granulating at 190 +/-20 ℃, and drying for 30 minutes at 70 +/-10 ℃ at the rotating speed of a main extruder of 180r/min and the feeding rotating speed of 45r/min to obtain the product.
Comparative example 1
The polypropylene composition is prepared from the following raw materials in parts by mass:
comparative example 2
The polypropylene composition is prepared from the following raw materials in parts by mass:
comparative example 3
The polypropylene composition is prepared from the following raw materials in parts by mass:
comparative example 4
The polypropylene composition is prepared from the following raw materials in parts by mass:
comparative example 5
The polypropylene composition is prepared from the following raw materials in parts by mass:
the comparative example was prepared as follows:
placing the components in a high-speed stirrer, stirring at a rotation speed of 1500 +/-30 r/min for 3 +/-1 min, and uniformly mixing; and then adding the obtained premix into a co-rotating double-screw extruder for melting and mixing, wherein the temperature of the highest section of the extruder is 220 +/-10 ℃, the rotating speed of a main machine of the extruder is 180 +/-10 r/min, and the feeding rotating speed is 40 +/-5 r/min, and extruding and granulating to obtain the polypropylene composition.
The yellowness index refers to the degree to which a colorless transparent or translucent or near-white plastic deviates from white. By determining the yellowness index of a plastic, its aging behavior can be investigated. A larger number indicates a more yellow sample, i.e., a more advanced aging. Most plastic products are desired to be as white as possible, however, the product or product is yellowed due to the forming process, the quality of the product or product can be controlled by measuring the yellow index, or the product or product is yellowed due to aging of heat, radiation, ultraviolet light irradiation and the like, and the yellow index can be measured to know the ultraviolet aging resistance.
The very obvious manifestation after PP aging is pulverization or embrittlement, and the performance index reflecting this phenomenon is to detect the change of the notch impact strength.
Pellets of the polypropylene compositions prepared in examples and comparative examples were dried and injection-molded on an injection molding machine, model K-TEC85, manufactured by MILACRON, Germany, to prepare property test specimens.
Tested according to the following national and industry standards:
the impact strength of the gap of the simply supported beam is tested according to GB/T1043-;
the tensile property is tested according to GB/T1040.2-2006;
the bending performance is tested according to GB/T9341-;
the load deformation temperature is tested according to GB/T1634.2-2004;
the yellow index (pellet) was tested according to HG _ T3862-2006;
oxidation induction time: the test was carried out according to GB/T8807-1988.
The molding shrinkage is measured in accordance with GB/T17037.4-2003 and is the difference in dimensions between a dried sample and the cavity of the mold in which it is molded, measured at room temperature within 16-24 hours after the sample has been molded, the sample being a 60x 60x 2mm square piece and the length l of the test sample being measured1And width b1And the length l of the mold cavity0And width b0Mold shrinkage parallel to the melt flow direction SMp, measured in the middle of the specimen width; the molding shrinkage SMn, measured in the middle of the specimen length, perpendicular to the melt flow direction is calculated as: SMp ═ 100 (l)0-l1)/l0And SMn 100 (b)0-b1)/b0。
The basic properties of examples 1-5 are as follows:
TABLE 1 test results for examples 1-5
The basic properties of comparative examples 1-4 are as follows:
TABLE 2 test results for comparative examples 1-4
As can be seen from the comparison of the test results of examples with those of comparative examples, the compounds of comparative examples have their own defects in properties, or poor resistance to thermal oxygen aging, or low heat distortion temperature, or insufficient toughness, or low shrinkage, but low strength and flexural modulus. The preparation processes of comparative example 5 and example 2 are different, and thus different results are produced.
The polypropylene composition has high thermal oxygen aging resistance, excellent mechanical property and impact toughness, high thermal deformation temperature and further improved dimensional stability, and is a composite material with excellent comprehensive performance. If one or more components in the formula are deleted, the invention can only achieve the aim if the components are simultaneously adopted.
Claims (10)
1. A polypropylene composition resistant to thermal oxidative aging, characterized in that: the composite material comprises the following raw materials in parts by mass:
2. the thermo-oxidative aging resistant polypropylene composition according to claim 1, wherein: the polypropylene is homopolymerized polypropylene or random copolymerization polypropylene powder, the melt mass flow rate is 10-40g/10min, and the test condition is 230 ℃ and 2.16 kg.
3. The thermo-oxidative aging resistant polypropylene composition according to claim 1, wherein: the metallocene linear low-density polyethylene is a binary copolymer produced by ethylene and alpha-olefin under the action of metallocene catalyst on a gas-phase process device, the melt mass flow rate of the binary copolymer is 0.6-2.5g/10min under the condition of 2.16kg, and the density of the binary copolymer is 0.913-0.928g/cm3(ii) a The molecular weight distribution Mw/Mn is between 2.4 and 3.6, and the weight average molecular weight is 10 to 15 ten thousand.
4. The thermo-oxidative aging resistant polypropylene composition according to claim 1, wherein: the purity of the nanometer boron nitride is 99 percent, the particle size is 1-100nm, the BET specific surface area is 50-100m2(iv)/g, aspect ratio 13: 1.
5. The thermo-oxidative aging resistant polypropylene composition according to claim 1, wherein: the molecular weight of polyethylene glycol is 2000-3000.
6. The thermo-oxidative aging resistant polypropylene composition according to claim 1, wherein: the coupling agent is one of silane coupling agent, titanate coupling agent or aluminate coupling agent.
7. The thermo-oxidative aging resistant polypropylene composition according to claim 1, wherein: the acid absorbent is calcium stearate or zinc stearate.
8. The thermo-oxidative aging resistant polypropylene composition according to claim 1, wherein: the antistatic agent is glycerol monostearate.
9. A method for preparing a polypropylene composition against thermal oxidative aging according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
(1) adding a coupling agent into a round-bottom flask, then pouring isopropanol or petroleum ether and acetone, and stirring by using a magnetic stirrer to dissolve the isopropanol or petroleum ether and acetone; weighing polyethylene glycol, adding the polyethylene glycol into a coupling agent solution, heating and refluxing in a water bath or an oil bath, magnetically stirring, weighing nano boron nitride, adding the nano boron nitride into the coupling agent solution, continuously heating, refluxing and magnetically stirring, removing a solvent by using a rotary evaporator, drying the residual solid particles in a vacuum drying oven, taking out the solid particles and stirring the solid particles once every 10 minutes, grinding and crushing the obtained powder by using a vibration mill, and vibrating the powder for 30 to 60 minutes for later use;
(2) firstly mixing and stirring the phenol antioxidant and the phosphate antioxidant, and then adding the polypropylene powder, the metallocene linear low-density polyethylene, the phosphate antioxidant, the acid absorbent, the antistatic agent and the nano boron nitride treated in the step (1); mixing and stirring in a high-speed stirrer; and adding the mixed materials into a double-screw extruder, melting, plasticizing, extruding, granulating and drying to obtain the product.
10. The method for preparing a polypropylene composition against thermal-oxidative aging according to claim 9, wherein: in the step (2), mixing and stirring at high speed for 4-8 minutes in a high-speed stirrer, wherein the stirring speed is 500-1000 revolutions per minute, and the stirring temperature is 35-40 ℃; the length-diameter ratio of the screw is 35-40, and the screw is melted at the temperature of 180-210 ℃; the rotating speed of the extruder host is 150-220 r/min, the feeding rotating speed is 35-50 r/min, and the drying is carried out for 20-35 minutes at the temperature of 60-80 ℃.
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| CN105153538A (en) * | 2015-07-28 | 2015-12-16 | 苏州荣昌复合材料有限公司 | Degradable PP (Polypropylene) plastics and preparation method therefor |
| CN110878158A (en) * | 2018-09-06 | 2020-03-13 | 中国石油化工股份有限公司 | Thermal-oxidative-aging-resistant impact-resistant polypropylene composition and preparation method thereof |
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| CN105153538A (en) * | 2015-07-28 | 2015-12-16 | 苏州荣昌复合材料有限公司 | Degradable PP (Polypropylene) plastics and preparation method therefor |
| CN110878158A (en) * | 2018-09-06 | 2020-03-13 | 中国石油化工股份有限公司 | Thermal-oxidative-aging-resistant impact-resistant polypropylene composition and preparation method thereof |
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