CN116478476A - PP/PA alloy and preparation method thereof - Google Patents
PP/PA alloy and preparation method thereof Download PDFInfo
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- CN116478476A CN116478476A CN202310503005.5A CN202310503005A CN116478476A CN 116478476 A CN116478476 A CN 116478476A CN 202310503005 A CN202310503005 A CN 202310503005A CN 116478476 A CN116478476 A CN 116478476A
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- 229910001125 Pa alloy Inorganic materials 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 239000002245 particle Substances 0.000 claims abstract description 92
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 89
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 89
- 239000004743 Polypropylene Substances 0.000 claims abstract description 59
- 229910052582 BN Inorganic materials 0.000 claims abstract description 46
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229920005989 resin Polymers 0.000 claims abstract description 35
- 239000011347 resin Substances 0.000 claims abstract description 35
- 239000002131 composite material Substances 0.000 claims abstract description 31
- 239000000945 filler Substances 0.000 claims abstract description 31
- -1 polypropylene Polymers 0.000 claims abstract description 24
- 229920001155 polypropylene Polymers 0.000 claims abstract description 24
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical compound CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229920006122 polyamide resin Polymers 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 3
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 26
- 238000002156 mixing Methods 0.000 claims description 17
- 239000000956 alloy Substances 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 14
- 239000012065 filter cake Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- 239000000047 product Substances 0.000 claims description 10
- 239000003963 antioxidant agent Substances 0.000 claims description 8
- 230000003078 antioxidant effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000000967 suction filtration Methods 0.000 claims description 8
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000001746 injection moulding Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 4
- 239000002861 polymer material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 10
- 239000003607 modifier Substances 0.000 description 8
- 239000008367 deionised water Substances 0.000 description 6
- 229910021641 deionized water Inorganic materials 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 150000001335 aliphatic alkanes Chemical group 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 230000005501 phase interface Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- JBSLOWBPDRZSMB-FPLPWBNLSA-N dibutyl (z)-but-2-enedioate Chemical compound CCCCOC(=O)\C=C/C(=O)OCCCC JBSLOWBPDRZSMB-FPLPWBNLSA-N 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention belongs to the technical field of high polymer materials, and particularly relates to a PP/PA alloy and a preparation method thereof. The product prepared by the invention comprises the following raw materials in parts by weight: 80-100 parts of polypropylene resin, 40-50 parts of polyamide resin and 10-15 parts of composite filler; wherein, the composite filler comprises flaky boron nitride particles and flaky graphene oxide particles, and the flaky boron nitride particles are at least partially embedded between the flaky graphene oxide particles; the D50 of the flaky boron nitride particles is 0.1-0.15 times of the D50 of the flaky graphene oxide particles; the D50 of the flaky graphene oxide particles is 10-25 mu m; the dosage of the flaky boron nitride particles is 10-15% of the mass of the flaky graphene oxide particles; the flaky graphene oxide comprises an edge region and a conjugated region, and the conjugated region is grafted with octadecylamine through a chemical bond; the flaky boron nitride particles are dispersed in the edge area of the flaky graphene oxide particles.
Description
Technical Field
The invention belongs to the technical field of high polymer materials. More particularly, it relates to a PP/PA alloy and a method for preparing the same.
Background
Polyamide (PA for short, commonly called nylon) is an important engineering plastic, but has high hygroscopicity, so that the dimensional stability is poor. Polypropylene (PP for short) is a general thermoplastic polymer with excellent comprehensive properties, high yield and wide application, but has brittleness at low temperature and poor cold resistance and weather resistance. In order to improve the defects of the two, the industry usually adopts a blending technology to mix the two to form PP/PA alloy, overcomes the defects of single-component polymers and plays the advantages of each component. However, PA and PP are typical thermodynamically incompatible systems, with high interfacial tension and low interfacial adhesion, resulting in poor mechanical properties of the alloy. In order to improve the compatibility of PA and PP, a modifier is usually added into the alloy to improve the compatibility between the two components, and the affinity between the phase interfaces of the PA and the PP is improved, so that the comprehensive performance of the alloy is improved. It is noted that these modifiers are typically organic, such as PP grafted maleic anhydride, PP grafted butyl acrylate, PP grafted dibutyl maleate, and the like. In recent years, people slowly find that after special treatment is carried out on the inorganic modifier, the compatibility problem of the PP/PA alloy can be effectively improved, and the mechanical property of the PP/PA alloy can be obviously improved.
The morphology of the alloy blend has an important impact on the material properties. If inorganic modifier is added directly to the PP/PA alloy, the distribution of the modifier in the polymer tends to be different. Therefore, the unmodified inorganic modifier particles cannot be well dispersed at the system phase interface, the phase interface is weak, and the obtained alloy has poor performances in all aspects and has no practical value.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings that the existing PP/PA alloy material is poor in dispersibility of an inorganic modifier in the alloy material and poor in combination with a resin interface, and the comprehensive performance of the alloy material is poor due to the fact that the inorganic modifier is directly added into the existing PP/PA alloy material.
The invention aims to provide a PP/PA alloy.
The invention further aims to provide a preparation method of the PP/PA alloy.
The above object of the present invention is achieved by the following technical scheme:
the PP/PA alloy comprises the following raw materials in parts by weight:
80-100 parts of polypropylene resin, 40-50 parts of polyamide resin and 10-15 parts of composite filler;
wherein the composite filler comprises flaky boron nitride particles and flaky graphene oxide particles, and the flaky boron nitride particles are at least partially embedded between the flaky graphene oxide particles;
the D50 of the flaky boron nitride particles is 0.1-0.15 times of the D50 of the flaky graphene oxide particles;
the D50 of the flaky graphene oxide particles is 10-25 mu m.
According to the technical scheme, the boron nitride particles with smaller particle sizes and the graphene oxide particles with larger particle sizes are utilized for blending to form a composite filler system, at least part of the boron nitride particles are embedded between the flaky graphene oxide particles in the composite filler, and the graphene oxide surface contains polar oxygen-containing functional groups and has good interfacial compatibility with PA resin, besides, the molecular structure of the graphene oxide surface also has nonpolar parts and has good interfacial compatibility with PP resin, so that the agglomeration problem caused by higher surface energy of small-particle boron nitride and poor compatibility with the resin system can be effectively avoided; however, if graphene is added singly, the graphene is light, and is only dispersed on the surface of a resin system in the processing process, and longer processing time or special processing equipment is often required, more antioxidant is required to be introduced in the longer processing process, otherwise, the resin is easily oxidized at high temperature, so that the product performance is degraded; after the boron nitride particles are embedded between graphene layers, the density of graphene oxide can be remarkably increased, so that the graphene oxide has better dispersion capability in the processing process;
in addition, the inventors found that when the D50 of the boron nitride particles and the D50 of the graphene oxide particles satisfy the above-described proportional relationship, the boron nitride particles are more easily embedded in the graphene oxide particles, and can be effectively adsorbed and fixed by the graphene oxide particles to avoid desorption after the embedding.
Further, the dosage of the flaky boron nitride particles is 10-15% of the mass of the flaky graphene oxide particles.
The dosage of the boron nitride particles is controlled so as to avoid that a large amount of boron nitride particles are not embedded between graphene oxide layers, so that the non-embedded particles are difficult to disperse in a resin system, and the comprehensive performance of the resin is reduced.
Further, the graphene oxide flakes include an edge region and a conjugated region, and the conjugated region is grafted with octadecylamine through a chemical bond.
Further, the flaky boron nitride particles are dispersed in the edge areas of the flaky graphene oxide particles.
By further grafting octadecylamine of long alkane chain in the graphene oxide conjugated region, due to incompatibility between boron nitride and alkane chain of octadecylamine, boron nitride can be controlled to be away from the conjugated region when being embedded between graphene oxide layers, so that the boron nitride is embedded in the graphene oxide after being adsorbed by carboxyl of the edge region and the edge region of the graphene oxide; therefore, the hard boron nitride particles can strengthen the edge area of the graphene oxide, when the hard boron nitride particles are blended with a resin system, alkane chains of the resin are easy to intertwine with the hard edge area, so that physical anchor points are formed, in the mixing process, the composite filler can be favorably and rapidly dispersed in the system after being involved by the alkane chains of the resin, and after the materials are cooled and solidified, the anchored molecular chains and the composite filler can be firmly combined, so that the comprehensive performance of the product is obviously improved.
Further, the polypropylene resin also comprises 1.5 to 2.0 percent of lithium chloride by mass.
According to the technical scheme, the lithium chloride is further added into the raw material system, so that the lithium chloride and the PA resin in the system are subjected to a complexation reaction, the crystallization behavior of the PA resin is changed, the PA resin is in an amorphous state, and movement of a resin molecular chain in the processing process is facilitated, so that a physical anchor point can be formed between the resin system and the composite filler more easily.
The preparation method of the PP/PA alloy comprises the following specific preparation steps:
preparation of composite filler:
mixing flaky boron nitride particles and flaky graphene oxide particles, pouring the mixture into water, performing ultrasonic dispersion for 20-30min at 150-200kHz, performing suction filtration, collecting a filter cake, and drying to obtain a composite filler;
preparation of alloy materials:
preparing polypropylene resin, polyamide resin and composite filler according to the composition of raw materials, fully drying the three materials, blending the raw materials, extruding the mixture in a double-screw extruder, and performing injection molding to obtain the PP/PA alloy product.
Further, the specific preparation steps further comprise: before the preparation of the composite filler, the graphene oxide is pretreated;
the pretreatment of the graphene oxide comprises the following steps:
mixing and dispersing graphene oxide and water, adding octadecylamine accounting for 5-10% of the mass of the graphene oxide, heating and stirring at 80-85 ℃ for reaction for 24-36h, filtering, washing and drying to finish pretreatment of the graphene oxide.
Further, the specific preparation steps further comprise: in the preparation process of the alloy material, lithium chloride accounting for 1.5 to 2.0 percent of the mass of the polypropylene resin is added during the raw material blending.
Detailed Description
The present invention is further illustrated below with reference to specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Reagents and materials used in the following examples are commercially available unless otherwise specified.
Example 1
Pretreatment of flaky graphene oxide particles:
the flaky graphene oxide particles and water are mixed according to the mass ratio of 1:10, stirring and dispersing for 10min at a rotating speed of 300r/min by using a stirrer, adding octadecylamine accounting for 5% of the mass of the flaky graphene oxide particles in a stirring state, heating and stirring at a temperature of 80 ℃ for reaction for 24h, filtering, collecting a filter cake, washing the filter cake with deionized water for 3 times, transferring the washed filter cake into a baking oven, and drying at a temperature of 95 ℃ to constant weight to obtain pretreated graphene oxide; the D50 of the flaky graphene oxide particles is 10 μm;
preparation of composite filler:
mixing pretreated graphene oxide and flaky boron nitride particles with the mass of 10% of that of the pretreated graphene oxide, pouring the mixture into deionized water with the mass of 10 times of that of the pretreated graphene oxide, performing high-frequency ultrasonic dispersion at 150kHz for 20min, performing suction filtration, collecting a filter cake, and drying to constant weight at the temperature of 100 ℃ to obtain a composite filler; firstly, peeling off a lamellar structure of the graphene oxide by ultrasonic dispersion, and enlarging the interlayer spacing, so that boron nitride lamellar particles with smaller size are embedded between the lamellar particles, and then, retracting the interlayer spacing of the graphene oxide and fixing the boron nitride particles by suction filtration; the D50 of the flaky boron nitride particles is 0.1 times that of the flaky graphene oxide particles D50;
preparation of alloy materials:
sequentially taking 80 parts of polypropylene resin, 40 parts of polyamide resin and 10 parts of composite filler according to parts by weight; lithium chloride accounting for 1.5 percent of the mass of the polypropylene resin; an antioxidant accounting for 0.6 percent of the mass of the polypropylene;
firstly, blending polypropylene resin, polyamide resin, composite filler, lithium chloride and an antioxidant, and then transferring the mixture into a double-screw extruder, wherein the length-diameter ratio of the extruder is 48, the diameter is 45mm, the highest temperature of the extruder is 225 ℃, and the screw rotating speed is 160r/min; and then injection molding is carried out at 220 ℃ to obtain the PP/PA alloy product.
Example 2
Pretreatment of flaky graphene oxide particles:
the flaky graphene oxide particles and water are mixed according to the mass ratio of 1:11, stirring and dispersing for 15min at a rotating speed of 400r/min by using a stirrer, adding octadecylamine accounting for 8% of the mass of the flaky graphene oxide particles in a stirring state, heating and stirring at a temperature of 82 ℃ for reaction for 32h, filtering, collecting a filter cake, washing the filter cake with deionized water for 4 times, transferring the washed filter cake into a drying oven, and drying at a temperature of 98 ℃ to constant weight to obtain pretreated graphene oxide; the D50 of the flaky graphene oxide particles is 20 mu m;
preparation of composite filler:
mixing pretreated graphene oxide and flaky boron nitride particles with the mass of 12% of that of the pretreated graphene oxide, pouring the mixture into deionized water with the mass of 11 times of that of the pretreated graphene oxide, performing high-frequency ultrasonic dispersion at 180kHz for 25min, performing suction filtration, collecting a filter cake, and drying to constant weight at the temperature of 102 ℃ to obtain a composite filler; firstly, peeling off a lamellar structure of the graphene oxide by ultrasonic dispersion, and enlarging the interlayer spacing, so that boron nitride lamellar particles with smaller size are embedded between the lamellar particles, and then, retracting the interlayer spacing of the graphene oxide and fixing the boron nitride particles by suction filtration; the D50 of the flaky boron nitride particles is 0.12 times that of the flaky graphene oxide particles D50;
preparation of alloy materials:
sequentially taking 90 parts of polypropylene resin, 45 parts of polyamide resin and 12 parts of composite filler according to parts by weight; lithium chloride accounting for 1.8 percent of the mass of the polypropylene resin; an antioxidant accounting for 0.7 percent of the mass of the polypropylene;
firstly, mixing polypropylene resin, polyamide resin, composite filler, lithium chloride and an antioxidant, and then transferring the mixture into a double-screw extruder, wherein the length-diameter ratio of the extruder is 49, the diameter is 45mm, the highest temperature of the extruder is 228 ℃, and the screw rotating speed is 165r/min; and then injection molding is carried out at 220 ℃ to obtain the PP/PA alloy product.
Example 3
Pretreatment of flaky graphene oxide particles:
the flaky graphene oxide particles and water are mixed according to the mass ratio of 1:12, stirring and dispersing for 20min at a rotating speed of 500r/min by using a stirrer, adding octadecylamine accounting for 10% of the mass of the flaky graphene oxide particles in a stirring state, heating and stirring at a temperature of 85 ℃ for reaction for 36h, filtering, collecting a filter cake, washing the filter cake with deionized water for 5 times, transferring the washed filter cake into a drying oven, and drying at a temperature of 100 ℃ to constant weight to obtain pretreated graphene oxide; the D50 of the flaky graphene oxide particles is 25 μm;
preparation of composite filler:
mixing pretreated graphene oxide and flaky boron nitride particles with the mass of 15% of that of the pretreated graphene oxide, pouring the mixture into deionized water with the mass of 12 times of that of the pretreated graphene oxide, performing high-frequency ultrasonic dispersion for 30min at 200kHz, performing suction filtration, collecting a filter cake, and drying to constant weight at the temperature of 105 ℃ to obtain a composite filler; firstly, peeling off a lamellar structure of the graphene oxide by ultrasonic dispersion, and enlarging the interlayer spacing, so that boron nitride lamellar particles with smaller size are embedded between the lamellar particles, and then, retracting the interlayer spacing of the graphene oxide and fixing the boron nitride particles by suction filtration; the D50 of the flaky boron nitride particles is 0.15 times that of the flaky graphene oxide particles D50;
preparation of alloy materials:
sequentially taking 100 parts of polypropylene resin, 50 parts of polyamide resin and 15 parts of composite filler according to parts by weight; lithium chloride accounting for 2.0 percent of the mass of the polypropylene resin; an antioxidant accounting for 0.8 percent of the mass of the polypropylene;
firstly, blending polypropylene resin, polyamide resin, composite filler, lithium chloride and an antioxidant, and then transferring the mixture into a double-screw extruder, wherein the length-diameter ratio of the extruder is 50, the diameter is 45mm, the highest temperature of the extruder is 230 ℃, and the screw rotating speed is 170r/min; and then injection molding is carried out at 220 ℃ to obtain the PP/PA alloy product.
Example 4
The difference between this embodiment and embodiment 1 is that: the dosage of the flaky boron nitride particles is 8% of the mass of the pretreated graphene oxide, and the rest conditions are kept unchanged.
Example 5
The difference between this embodiment and embodiment 1 is that: the dosage of the flaky boron nitride particles is 17% of the mass of the pretreated graphene oxide, and the rest conditions are kept unchanged.
Example 6
The difference between this embodiment and embodiment 1 is that: graphene oxide was not pretreated with octadecylamine and the remaining conditions remained unchanged.
Example 7
The difference between this embodiment and embodiment 1 is that: no lithium chloride was added and the rest of the conditions remained unchanged.
Comparative example 1
The difference between this comparative example and example 1 is that: the pretreated graphene oxide is replaced by alumina particles with equal quality, and the rest conditions are kept unchanged.
Comparative example 2
This comparative example is different from example 1 in that the flaky boron nitride particles are not added and the remaining conditions remain unchanged.
Comparative example 3
This comparative example is different from example 1 in that the D50 of the flaky boron nitride particles is 0.3 times that of the flaky graphene oxide particles D50, and the remaining conditions remain unchanged.
The products obtained in examples 1 to 7 and comparative examples 1 to 3 were subjected to performance tests, and specific test methods and test results are as follows:
the stretching performance is carried out according to GB/T1040-1992, and the stretching speed is controlled to be 50mm/min;
bending performance was carried out according to GB/T9341-2008 with an experimental speed of 5mm/min;
the notched impact strength of the simply supported beam is carried out according to GB/T1043-1993;
the specific test results are shown in Table 1;
table 1: product performance test results
| Tensile Strength/MPa | Flexural Strength/MPa | Impact Strength/KJ/m 2 | |
| Example 1 | 45.6 | 58.6 | 9.5 |
| Example 2 | 45.7 | 59.1 | 9.7 |
| Example 3 | 45.9 | 59.4 | 9.8 |
| Example 4 | 42.2 | 55.4 | 9.1 |
| Example 5 | 43.1 | 56.1 | 9.2 |
| Example 6 | 42.6 | 55.7 | 9.2 |
| Example 7 | 41.9 | 52.2 | 9.0 |
| Comparative example 1 | 38.5 | 46.2 | 8.2 |
| Comparative example 2 | 39.1 | 47.5 | 8.2 |
| Comparative example 3 | 39.6 | 47.7 | 8.3 |
As shown by the test results in Table 1, the product obtained by the invention has relatively excellent comprehensive mechanical properties.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (9)
1. The PP/PA alloy is characterized by comprising the following raw materials in parts by weight:
80-100 parts of polypropylene resin, 40-50 parts of polyamide resin and 10-15 parts of composite filler;
wherein the composite filler comprises flaky boron nitride particles and flaky graphene oxide particles, and the flaky boron nitride particles are at least partially embedded between the flaky graphene oxide particles;
the D50 of the flaky boron nitride particles is 0.1-0.15 times of the D50 of the flaky graphene oxide particles;
the D50 of the flaky graphene oxide particles is 10-25 mu m.
2. The PP/PA alloy of claim 1, wherein the amount of the flaky boron nitride particles is 10-15% of the mass of the flaky graphene oxide particles.
3. The PP/PA alloy of claim 1 wherein the graphene oxide flakes include edge regions and conjugated regions, and wherein the conjugated regions are grafted with octadecylamine via chemical bonds.
4. A PP/PA alloy as set forth in claim 3 wherein said platelet-shaped boron nitride particles are dispersed in said platelet-shaped graphene oxide particle edge regions.
5. The PP/PA alloy of claim 1 further comprising 1.5-2.0% by mass of lithium chloride of said polypropylene resin.
6. The PP/PA alloy of claim 1 further comprising an antioxidant in an amount of 0.6-0.8% by mass of the polypropylene resin.
7. A process for the preparation of PP/PA alloys as claimed in any of claims 1-6, characterized in that the specific preparation steps comprise:
preparation of composite filler:
mixing flaky boron nitride particles and flaky graphene oxide particles, pouring the mixture into water, performing ultrasonic dispersion for 20-30min at 150-200kHz, performing suction filtration, collecting a filter cake, and drying to obtain a composite filler;
preparation of alloy materials:
preparing polypropylene resin, polyamide resin and composite filler according to the composition of raw materials, fully drying the three materials, blending the raw materials, extruding the mixture in a double-screw extruder, and performing injection molding to obtain the PP/PA alloy product.
8. The method for producing PP/PA alloy of claim 7, wherein the specific production steps further include: before the preparation of the composite filler, the graphene oxide is pretreated;
the pretreatment of the graphene oxide comprises the following steps:
mixing and dispersing graphene oxide and water, adding octadecylamine accounting for 5-10% of the mass of the graphene oxide, heating and stirring at 80-85 ℃ for reaction for 24-36h, filtering, washing and drying to finish pretreatment of the graphene oxide.
9. The method for producing PP/PA alloy of claim 7, wherein the specific production steps further include: in the preparation process of the alloy material, 10-12% of polypropylene grafted with maleic anhydride and 1.5-2.0% of lithium chloride by mass of polypropylene resin are added during raw material blending.
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Citations (10)
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