CN116063790A - Polypropylene alloy material and preparation method thereof - Google Patents
Polypropylene alloy material and preparation method thereof Download PDFInfo
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- CN116063790A CN116063790A CN202111285625.3A CN202111285625A CN116063790A CN 116063790 A CN116063790 A CN 116063790A CN 202111285625 A CN202111285625 A CN 202111285625A CN 116063790 A CN116063790 A CN 116063790A
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 140
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 140
- 239000000956 alloy Substances 0.000 title claims abstract description 67
- -1 Polypropylene Polymers 0.000 title claims abstract description 63
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 239000003607 modifier Substances 0.000 claims abstract description 14
- 238000003756 stirring Methods 0.000 claims abstract description 4
- 239000000155 melt Substances 0.000 claims description 38
- 229920002943 EPDM rubber Polymers 0.000 claims description 13
- 229920001971 elastomer Polymers 0.000 claims description 8
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 4
- 239000000806 elastomer Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229920001577 copolymer Polymers 0.000 claims description 3
- 239000005062 Polybutadiene Substances 0.000 claims description 2
- 229920002857 polybutadiene Polymers 0.000 claims description 2
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 claims description 2
- 238000001746 injection moulding Methods 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 14
- 230000008569 process Effects 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 17
- 238000012545 processing Methods 0.000 description 15
- 238000002347 injection Methods 0.000 description 14
- 239000007924 injection Substances 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 238000011056 performance test Methods 0.000 description 13
- 239000011347 resin Substances 0.000 description 11
- 229920005989 resin Polymers 0.000 description 11
- 239000004698 Polyethylene Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 150000002978 peroxides Chemical class 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 239000005060 rubber Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000007385 chemical modification Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 239000002077 nanosphere Substances 0.000 description 3
- 150000001721 carbon Chemical class 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000143432 Daldinia concentrica Species 0.000 description 1
- 239000011954 Ziegler–Natta catalyst Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003049 inorganic solvent Substances 0.000 description 1
- 229910001867 inorganic solvent Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910021392 nanocarbon Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Classifications
-
- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Abstract
The invention belongs to the technical field of high polymer materials, and discloses a polypropylene alloy material and a preparation method thereof, wherein the polypropylene alloy material comprises the following components: 1) Low melt index polypropylene; 2) High melt index polypropylene; 3) Toughening modifier. Stirring and mixing the components to obtain a mixture; and (3) melt blending the mixture to obtain the polypropylene alloy material. The polypropylene alloy material has high fluidity, high rigidity and high toughness, and can be used for producing thin-wall injection molding products with complex shapes. The preparation method disclosed by the invention is simple in technical process, low in equipment requirement and easy to realize industrial production.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a polypropylene alloy material and a preparation method of the polypropylene alloy material.
Background
Polypropylene (PP) is one of the most widely used plastics in the world today with the highest yields. The PP has the advantages of abundant sources of raw materials, low cost, excellent comprehensive performance, higher strength and modulus, excellent chemical stability, easy processing and forming, no toxicity and no smell, and the product can be widely applied to the fields of daily necessities, industrial packaging, automobile home appliances and the like.
At present, plastic parts of automobiles or household appliances gradually exhibit the characteristics of complex shape, thin wall, integration and large size. The PP raw material used is required to have excellent processing fluidity, rigidity strength and impact toughness, the high fluidity can enable the PP raw material to be processed into thin-wall parts on injection molding equipment quickly, the high strength and high rigidity can enable the PP product to have good deformation resistance, and the high toughness can enable the PP product to be capable of effectively resisting damage of external impact force, enhancing the service performance and prolonging the service life.
In general, the fluidity and toughness of the common PP resin cannot meet the processing and use requirements at the same time, and the common PP resin must be modified. Toughening modification can be divided into two main categories, namely chemical modification and physical modification: the toughness of the polymer is improved by changing the molecular chain composition and structure of the polymer, such as copolymerization, grafting, crosslinking and other methods, which is called chemical modification; by adding the second component as a toughening modifier, a proper phase structure is constructed, and toughness is further improved, such as blending modification and the like, which is called physical modification. Chemical modification tends to involve complex polymerization processes, which are costly and complex, so that the most widely used and effective method currently is to blend PP with rubber or elastomers to improve their impact toughness. The elastomer has higher elasticity and lower glass transition temperature (Tg), so that the toughness of the PP can be obviously improved, but the original strength and modulus of the PP can be greatly reduced while toughening.
The performance of the PP alloy material is closely related to the molecular weight of the matrix PP resin. Generally, the higher the molecular weight of the PP matrix, the higher the strength, modulus and toughness (i.e. the better the balance between stiffness and toughness), so high performance PP alloy materials often need to be prepared with PP matrices of high molecular weight. However, high molecular weight PP has difficulty meeting the basic requirements for high popularity of thin-walled parts due to its high entanglement density and very low melt index. For example, commercial PP with a melt index of about 2-10g/10min has poor fluidity, and is not easy to completely punch when manufacturing large thin-wall injection molding products with complex structures, and has low yield; however, when the melt index is higher than 30g/10min, the die is easier, but the strength modulus and toughness are drastically reduced, and the use requirement cannot be met. That is, it is often difficult to combine high fluidity with high strength and high toughness. Therefore, the PP alloy material with high fluidity, high strength and high toughness, which can meet the demands of commercial application, is developed, and has important significance and practical value.
In patent document CN1034741, the toughness toughening efficiency is further regulated and controlled by introducing peroxide into PP resin to regulate the molecular weight, adding ethylene propylene rubber to improve the toughness, and adding a nucleating agent to refine the grain size. However, the technology is complex in process, and the polyethylene phase in the ethylene propylene rubber is easy to crosslink by adding peroxide.
Patent document CN102391584a aims at the problems of PP flowability and toughness, and the flowability is improved by adding peroxide for degradation when synthesizing propylene heterophasic copolymer, but this method is only applicable to raw material polymerization manufacturers, and cannot be applied in downstream small enterprises.
In patent document CN107075200B, a polypropylene resin with high fluidity and heat resistance is invented, and the fluidity is improved by polymerizing propylene homopolymer and ethylene-propylene rubber copolymer in a reactor under the action of Ziegler-Natta catalyst, and by controlling the broad distribution of molecular weight. The method involves complex reaction, and besides a reaction kettle device, a plurality of chemical materials such as organic solvents and inorganic solvents are involved due to special requirements on the catalyst, so that the method has a certain safety risk, has laboratory research value, and has no commercial application value.
In patent document CN111484676a, a polypropylene resin having improved toughness is invented, and fluidity is improved. The method is to mix modified nano carbon balls, lubricant and the like into PP to improve the fluidity. The preparation method of the modified carbon nanospheres is complex in steps, gamma rays are required to be used for carrying out irradiation treatment on polyethylene to obtain gamma-PE, then the gamma-PE and common PE are subjected to reaction extrusion according to a certain proportion to obtain long-chain branched polyethylene, and then the long-chain branched polyethylene and the carbon nanospheres are subjected to melt blending to prepare the modified carbon nanospheres.
As described above, in the prior art, there are many cases where chemical oxidation means are used or special materials are required to improve the fluidity of PP. The raw materials are not easy to obtain, and the steps are simple and easy to realize. At present, a technical means which can simultaneously realize a simple processing method and processing equipment and has excellent flowability, rigidity and toughness of a product is needed.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a polypropylene alloy material and a preparation method thereof. The polypropylene alloy material has excellent processing fluidity, high rigidity and high toughness.
The first aspect of the present invention provides a polypropylene alloy material comprising the following components:
1) Low melt index polypropylene;
2) High melt index polypropylene;
3) Toughening modifier.
The second aspect of the present invention provides a method for preparing the polypropylene alloy material, which comprises the following steps:
1) Stirring and mixing the components to obtain a mixture;
2) And (3) melt blending the mixture to obtain the polypropylene alloy material.
Compared with the prior art, the invention has the following beneficial effects:
1. the PP alloy material prepared by the invention has excellent processing fluidity, high rigidity and toughness.
2. The high melt-index polypropylene (PP-H) and the low melt-index polypropylene (PP-L) adopted in the invention are commercial PP resins, are not special customized materials, have wide acquisition channels and are beneficial to factory processing and use.
3. The invention fully utilizes the fluidity of the high-melt-index PP resin and the high strength and high toughness of the low-melt-index PP resin, and the high-melt-index PP resin and the low-melt-index PP resin are fully complementary to each other, so that the preparation of the high-strength and high-toughness PP alloy with high fluidity is realized.
4. The invention can realize the preparation of the high-fluidity high-strength high-toughness PP alloy through simple melt blending, does not need to add peroxide to reduce the degradation of a molecular chain, does not form small molecular byproducts to influence the performance, and has simple performance regulation and control.
5. The high-strength high-toughness polypropylene alloy material with excellent processing fluidity can be operated by common extrusion or injection equipment, and can be realized by common commercial production equipment, so that the equipment cost is low, the process is simple and efficient, and the industrial production is easy to realize.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
The following describes specific embodiments of the present invention in detail. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
According to a first aspect of the present invention there is provided a polypropylene alloy material comprising the following components:
1) Low melt index polypropylene;
2) High melt index polypropylene;
3) Toughening modifier.
In the invention, the melt index of the low-melt polypropylene (PP-L) is 2-10g/10min under the conditions of 230 ℃ and 2.16kg load. PP-L can impart excellent strength and toughness to alloy materials.
According to the invention, the melt index of the high melt index polypropylene (PP-H) is 30-100g/10min at 230 ℃ under a load of 2.16 kg. The PP-H can be used as a flow modifier to provide excellent processing fluidity, and is beneficial to extrusion or thin-wall injection molding of PP alloy materials.
In the invention, the low melt-index polypropylene and the high melt-index polypropylene are both homo-polypropylene, and the isotacticity is more than or equal to 95%.
Preferably, the toughening modifier is at least one selected from ethylene propylene diene monomer, ethylene octene copolymer, styrene thermoplastic elastomer, butadiene rubber and propylene elastomer.
According to the invention, the low melt polypropylene is used in an amount of 30-70 parts by weight, preferably 30-60 parts by weight, the high melt polypropylene is used in an amount of 70-30 parts by weight, preferably 70-40 parts by weight, and the total amount of the low melt polypropylene and the high melt polypropylene is 100 parts by weight, and the toughening modifier is used in an amount of 20-40 parts by weight.
In the present invention, various raw materials are commercially available as long as they can meet the use requirements.
According to a second aspect of the present invention, there is provided a method for preparing the polypropylene alloy material described above, the method comprising the steps of:
1) Stirring and mixing the components to obtain a mixture;
2) And (3) melt blending the mixture to obtain the polypropylene alloy material.
Specifically, the components are uniformly mixed by a mixing device, and the obtained mixture is subjected to melt blending by a melt blending device in the field of rubber and plastic processing to obtain the polypropylene alloy material. The above-mentioned mixing device is selected from the mechanical mixing devices such as high-speed mixer and kneader in the prior art. Generally, a high-speed stirrer is selected. The melt blending equipment in the rubber and plastic processing field can be an internal mixer, a single screw extruder, a double screw extruder and the like. The melt blending is a usual melt blending method in rubber and plastic processing, and the melt blending temperature, that is, the usual processing temperature of the components used, is usually 180-250 ℃ even if it should be selected within a range that ensures complete melting of the components used and does not decompose the components used.
The substances and parameters not defined in the present invention can be selected according to the prior art, and are conventional in the art.
The invention will be further illustrated with reference to the following examples. But are not limited by these examples.
In the following examples and comparative examples, the data were obtained as follows:
1. melt index determination: melt index was determined according to GB3682 (230 ℃,2.16 kg) using an XRN-400C melt flow rate tester.
2. Material tensile property test: carrying out a tensile test by using a SANS universal mechanical tester (Shenzhen Sansi Co., ltd.) at a tensile rate of 5mm/min and a test temperature of 23+/-2 ℃; dumbbell samples for testing were injection molded from the blend materials obtained in examples or comparative examples at a temperature of 200 ℃.
3. Material impact performance test: the measurement was carried out according to ISO180-2000 standard using XC-22Z type cantilever impact tester. The impact test sample for test is formed by injection molding the blend materials obtained in the examples or the comparative examples at a temperature of 200 ℃, and the test sample is firstly processed into V-shaped notch impact bars with a depth of 2mm and an angle of 45 DEG, and the test temperature is 23+/-2 ℃.
Examples 1-6 illustrate the polypropylene alloy materials of the present invention and methods of making the same.
Example 1
30 parts by weight of PP-L with a melt index of 3g/10min (230 ℃,2.16 kg), 70 parts by weight of PP-H with a melt index of 40g/10min (230 ℃,2.16 kg) and 20 parts by weight of ethylene propylene rubber are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Example 2
50 parts by weight of PP-L with a melt index of 3g/10min (230 ℃,2.16 kg), 50 parts by weight of PP-H with a melt index of 40g/10min (230 ℃,2.16 kg) and 20 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Example 3
70 parts by weight of PP-L with a melt index of 3g/10min (230 ℃,2.16 kg), 30 parts by weight of PP-H with a melt index of 40g/10min (230 ℃,2.16 kg) and 20 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Example 4
30 parts by weight of PP-L with a melt index of 3g/10min (230 ℃,2.16 kg), 70 parts by weight of PP-H with a melt index of 40g/10min (230 ℃,2.16 kg) and 40 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Example 5
50 parts by weight of PP-L with a melt index of 3g/10min (230 ℃,2.16 kg), 50 parts by weight of PP-H with a melt index of 40g/10min (230 ℃,2.16 kg) and 40 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Example 6
70 parts by weight of PP-L with a melt index of 3g/10min (230 ℃,2.16 kg), 30 parts by weight of PP-H with a melt index of 40g/10min (230 ℃,2.16 kg) and 40 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at the temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Comparative example 1
10 parts by weight of PP-L with a melt index of 3g/10min (230 ℃,2.16 kg), 90 parts by weight of PP-H with a melt index of 40g/10min (230 ℃,2.16 kg) and 40 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Comparative example 2
90 parts by weight of PP-L with a melt index of 3g/10min (230 ℃,2.16 kg), 10 parts by weight of PP-H with a melt index of 40g/10min (230 ℃,2.16 kg) and 40 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Comparative example 3
50 parts by weight of PP-L with a melt index of 3g/10min (230 ℃,2.16 kg), 50 parts by weight of PP-H with a melt index of 40g/10min (230 ℃,2.16 kg) and 10 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Comparative example 4
50 parts by weight of PP-L with a melt index of 3g/10min (230 ℃,2.16 kg), 50 parts by weight of PP-H with a melt index of 40g/10min (230 ℃,2.16 kg) and 50 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Comparative example 5
50 parts by weight of PP with a melt index of 20g/10min (230 ℃,2.16 kg), 50 parts by weight of PP with a melt index of 40g/10min (230 ℃,2.16 kg) and 40 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
Comparative example 6
50 parts by weight of PP with a melt index of 3g/10min (230 ℃,2.16 kg), 50 parts by weight of PP with a melt index of 20g/10min (230 ℃,2.16 kg) and 40 parts by weight of ethylene propylene diene monomer are added into a high-speed stirrer to be physically mixed, and then the mixture is melt-blended for 5 minutes at a temperature of 190 ℃ to obtain the PP alloy material. The obtained PP alloy material was injection molded at 200℃with an injection molding machine, and the obtained product was subjected to a performance test, the results of which are shown in Table 1.
TABLE 1
In combination with the data in table 1, it can be seen from examples 1, 2 and 3 that the melt index of the PP alloy can be effectively regulated and controlled by mixing PP-H and PP-L according to different proportions under the condition of a certain content of the toughening modifier, and the melt index of the PP alloy is continuously increased along with the increase of the PP-H content, so that the fluidity can be effectively improved. Furthermore, at comparable levels of toughening modifier, the examples exhibit higher impact properties than the comparative examples at similar melt indices, and the tensile strength remains at the same level. The high-melt-index and low-melt-index PP compound alloy material has the advantages that the high-melt-index and low-melt-index PP compound alloy material is provided with the advantages of high processing fluidity, high strength and high toughness because the low-molecular-weight and high-melt-index component matrix provides processing fluidity, the high-molecular-weight and low-melt-index component matrix provides mechanical strength, and the two components are simultaneously reserved. As can be seen from comparative examples 1 and 2, too high or too low a PP-H or PP-L ratio results in a mismatch in properties, too high a PP-H ratio, an obvious increase in flowability, but too few components providing mechanical properties, resulting in too low impact strength; the PP-H ratio is too low and the flowability loss is serious. As is clear from comparative examples 3 and 4, too low a content of the toughening modifier results in insufficient impact toughness, too high a toughening effect reaches a threshold value, and the rigidity and flowability of the alloy are limited while the improvement of impact properties is low, so that the toughening modifier is preferably 20-40 parts. As is clear from comparative examples 5 and 6, when the melt index of the PP component having a lower melt index in the PP alloy material is higher than 10g/10min, it is difficult to provide sufficient rigidity and toughness, whereas when the melt index of the PP component having a higher melt index is lower than 30g/10min, high fluidity cannot be provided.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (8)
1. A polypropylene alloy material, characterized in that the polypropylene alloy material comprises the following components:
1) Low melt index polypropylene;
2) High melt index polypropylene;
3) Toughening modifier.
2. The polypropylene alloy material according to claim 1, wherein the low melt index polypropylene has a melt index of 2-10g/10min at 230 ℃ under a load of 2.16 kg.
3. The polypropylene alloy material according to claim 1, wherein the high melt index polypropylene has a melt index of 30-100g/10min at 230 ℃ under a load of 2.16 kg.
4. The polypropylene alloy material according to any one of claims 1 to 3, wherein the low melt index polypropylene and the high melt index polypropylene are both homo-polypropylene and have an isotacticity of 95% or more.
5. The polypropylene alloy material according to claim 1, wherein the toughening modifier is at least one selected from ethylene propylene diene monomer, ethylene octene copolymer, styrene thermoplastic elastomer, butadiene rubber, and acryl elastomer.
6. The polypropylene alloy material according to claim 1, wherein the amount of the low melt-index polypropylene is 30 to 70 parts by weight, the amount of the high melt-index polypropylene is 70 to 30 parts by weight, and the total amount of the low melt-index polypropylene and the high melt-index polypropylene is 100 parts by weight, and the amount of the toughening modifier is 20 to 40 parts by weight.
7. The method for producing a polypropylene alloy material according to any one of claims 1 to 6, comprising the steps of:
1) Stirring and mixing the components to obtain a mixture;
2) And (3) melt blending the mixture to obtain the polypropylene alloy material.
8. The method for producing a polypropylene alloy material according to claim 7, wherein the temperature of melt blending is 180 to 250 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111285625.3A CN116063790A (en) | 2021-11-01 | 2021-11-01 | Polypropylene alloy material and preparation method thereof |
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| CN108424580A (en) * | 2018-03-27 | 2018-08-21 | 昆山禾振瑞新复合材料有限公司 | A kind of highly crystalline high floating insurance thick stick polypropylene dedicated material |
| CN112759845A (en) * | 2020-12-24 | 2021-05-07 | 重庆会通科技有限公司 | Polypropylene composite material and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108424580A (en) * | 2018-03-27 | 2018-08-21 | 昆山禾振瑞新复合材料有限公司 | A kind of highly crystalline high floating insurance thick stick polypropylene dedicated material |
| CN112759845A (en) * | 2020-12-24 | 2021-05-07 | 重庆会通科技有限公司 | Polypropylene composite material and preparation method and application thereof |
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