CN116891607A - Method for improving impact resistance of random copolymer polypropylene - Google Patents
Method for improving impact resistance of random copolymer polypropylene Download PDFInfo
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- CN116891607A CN116891607A CN202310623082.4A CN202310623082A CN116891607A CN 116891607 A CN116891607 A CN 116891607A CN 202310623082 A CN202310623082 A CN 202310623082A CN 116891607 A CN116891607 A CN 116891607A
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- random copolymer
- polypropylene
- copolymer polypropylene
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- -1 polypropylene Polymers 0.000 title claims abstract description 105
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 103
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 103
- 229920005604 random copolymer Polymers 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 26
- 238000001746 injection moulding Methods 0.000 claims abstract description 18
- 238000005452 bending Methods 0.000 claims abstract description 4
- 229920001400 block copolymer Polymers 0.000 claims abstract description 3
- 239000000155 melt Substances 0.000 claims abstract description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 10
- 239000005977 Ethylene Substances 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000011954 Ziegler–Natta catalyst Substances 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 claims description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 claims description 2
- 229960001948 caffeine Drugs 0.000 claims 1
- RYYVLZVUVIJVGH-UHFFFAOYSA-N trimethylxanthine Natural products CN1C(=O)N(C)C(=O)C2=C1N=CN2C RYYVLZVUVIJVGH-UHFFFAOYSA-N 0.000 claims 1
- 229920001971 elastomer Polymers 0.000 abstract description 10
- 239000000806 elastomer Substances 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract description 2
- 230000004048 modification Effects 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 7
- 238000011056 performance test Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 235000015243 ice cream Nutrition 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920005630 polypropylene random copolymer Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000005303 weighing 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
- C08L23/14—Copolymers of propene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
The invention relates to the technical field of polymer composite materials, and discloses a method for improving impact resistance of random copolymer polypropylene. The method specifically comprises the following steps: mixing the random copolymer polypropylene and the high impact transparent polypropylene product according to the following proportion, and performing injection molding to prepare the high impact transparent polypropylene: 50-100 parts of random copolymer polypropylene; 50-400 parts of high-impact transparent polypropylene; the normal temperature cantilever beam impact strength of the random copolymer polypropylene material is 3-10 kJ/m 2 The bending modulus is 800-1100 MPa; the high-impact transparent polypropylene material is any one or more than two of random copolymer polypropylene, block copolymer polypropylene and homopolymerized polypropylene; the normal temperature cantilever beam impact strength of the high impact transparent polypropylene material is 8-35kJ/m 2 The flexural modulus is 800-1200MPa, and the melt index is 15-30g/10min. The method can replace the modification of the random copolymer polypropylene by adding the elastomer POE to improve the resistance of the random polypropylene productImpact property, reduced production cost, safer components of polypropylene materials, and wider application range.
Description
Technical Field
The invention relates to the technical field of polymer composite materials, and discloses a method for improving impact resistance of random copolymer polypropylene.
Background
The random copolymer polypropylene product has excellent transparency and is mainly used for producing household articles such as a storage box, a preservation box and a storage box. However, due to the characteristics of the random copolymer polypropylene, the impact property of the random copolymer polypropylene is poor, the random copolymer polypropylene is easy to damage in the transportation process of products, and the cost of the product enterprises is increased. Meanwhile, the application to the low-temperature fields such as ice cream boxes, frozen food packaging boxes, low-temperature storage boxes and the like is limited.
At present, manufacturers mainly blend common transparent materials with elastomer POE and the like, so that the impact resistance of the product can be improved to a certain extent. However, according to the processing mode, the production cost is increased, and the rigidity of the product is obviously reduced and the safety performance of the product is also affected after the elastomer POE is added. Therefore, the method for improving the impact resistance of the random copolymer polypropylene can improve the impact resistance of the random copolymer polypropylene on the basis of ensuring that the properties such as flexural modulus, tensile strength, transparency and the like of the product are unchanged.
Disclosure of Invention
The invention has the conception that: the high-impact transparent polypropylene is used for replacing a random copolymer polypropylene product and is modified by adding an elastomer, so that the impact performance of the random copolymer polypropylene product is improved, and meanwhile, the properties of the product such as flexural modulus, tensile strength, transparency and the like are not changed.
The invention provides a method for improving impact resistance of random copolymer polypropylene, which specifically comprises the following steps: mixing the random copolymer polypropylene and the high impact transparent polypropylene product according to the following proportion, and performing injection molding to prepare the high impact transparent polypropylene;
50-100 parts of random copolymer polypropylene;
50-400 parts of high-impact transparent polypropylene;
the normal temperature cantilever beam impact strength of the random copolymer polypropylene material is 3-10 kJ/m 2 The bending modulus is 800-1100 MPa;
the high-impact transparent polypropylene material is any one or more than two of random copolymer polypropylene, block copolymer polypropylene and homopolymerized polypropylene; the normal temperature cantilever beam impact strength of the high impact transparent polypropylene material is 8-35kJ/m 2 The flexural modulus is 800-1200MPa, and the melt index is 15-30g/10min.
Preferably, the haze of the random copolymer polypropylene material is from 8 to 17%.
Further, the tensile yield stress of the random copolymer polypropylene material is 20-30MPa.
Preferably, the high impact transparent polypropylene material has a tensile yield stress of 20-30MPa.
Further, the haze of the high impact transparent polypropylene material is 8-15%.
Further, the injection molding preparation adopts an injection molding machine for preparation, the injection molding machine comprises four sections of temperature areas, and each temperature control is as follows: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
Further, the high impact transparent polypropylene material is prepared by adopting a Spheripol second-generation loop process, and the Spheripol second-generation loop process equipment comprises a first loop reactor, a second loop reactor and a vertical gas-phase fluidized bed reactor.
Further, the Spheripol second-generation loop process adopts a Ziegler-Natta catalyst as a main catalyst system and triethylaluminum as a cocatalyst.
Further, in the Spheripol second-generation loop process, initial polypropylene powder is prepared in a first loop reactor and a second loop reactor; the temperature of the first loop reactor and the second loop reactor is 60-80 ℃, the reaction pressure is 3-5 MPa, the hydrogen concentration is 1500-3500 mg/kg, the ethylene addition amount is 1-10%, and the density of the loop slurry is 450-550 kg/m 3 。
Further, in the Spheripol second-generation loop process, the initial polypropylene powder reacts with propylene, ethylene and hydrogen in a vertical gas-phase fluidized bed reactor to obtain a high-impact transparent polypropylene material; the vertical gas-phase fluidized bed has a gas-phase composition of ethylene/ethylene+propylene molar volume ratio of 0.1-0.5, a hydrogen/ethylene molar volume ratio of 0.4-0.7 and ethylene addition of 5-10%.
The invention has the beneficial effects that:
according to the method for improving the impact resistance of the random copolymer polypropylene, the impact resistance of the random copolymer polypropylene product is improved by mixing the random copolymer polypropylene with the high-impact transparent polypropylene product according to a certain proportion and then preparing the sample, so that the impact resistance of the random copolymer polypropylene product can be improved by replacing the modification of the random copolymer polypropylene by adding the elastomer POE, the production cost is reduced, and meanwhile, the components of the polypropylene material are safer and have a wider application range.
Detailed Description
The present invention will be further described in detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent.
It should be noted that the present invention is not limited to the following examples. The methods are conventional methods unless otherwise specified. The starting materials are commercially available from the public unless otherwise specified.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The performance test criteria in each example are as follows:
(1) Tensile yield stress: GB/T1040.1-2018
(2) Flexural modulus: GB/T9341-2008
(3) Cantilever impact strength: GB/T1843-2008
(4) Haze: GB T2410-2008
The random copolymer polypropylene, the high impact transparent polypropylene and the elastomer POE used in the examples and comparative examples of the present invention are the same batch material. The normal temperature cantilever beam impact strength of the random copolymer polypropylene material is 3-10 kJ/m 2 The bending modulus is 800-1100 MPa, and the tensile yield stress is 20-30 MPa; the high impact transparent polypropylene is block copolymerized polypropylene, and the cantilever impact strength is 20-30 kJ/m 2 The flexural modulus is 950-1200 MPa, and the tensile yield stress is 25-30 MPa; the elastomer POE is ceramic 8999.
Example 1
100 parts of random copolymer polypropylene and 100 parts of high-impact transparent polypropylene are respectively weighed according to parts by mass, and uniformly mixed to prepare a sample. The temperature control of each temperature zone of the injection molding machine is as follows: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
Example 2
100 parts of random copolymer polypropylene and 150 parts of high-impact transparent polypropylene are respectively weighed according to parts by mass, and uniformly mixed to prepare a sample. The temperature control of each temperature zone of the injection molding machine is as follows: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
Example 3
100 parts of random copolymer polypropylene and 200 parts of high impact transparent polypropylene are respectively weighed according to parts by mass, and uniformly mixed to prepare a sample. The temperature control of each temperature zone of the injection molding machine is as follows: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
Example 4
100 parts of random copolymer polypropylene and 300 parts of high impact transparent polypropylene are respectively weighed according to parts by mass, and uniformly mixed to prepare a sample. The temperature control of each temperature zone of the injection molding machine is as follows: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
Example 5
200 parts of random copolymer polypropylene and 100 parts of high impact transparent polypropylene are respectively weighed according to parts by mass, and uniformly mixed to prepare a sample. The temperature control of each temperature zone of the injection molding machine is as follows: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
Comparative example 1
Weighing 100 parts of random copolymer polypropylene, and controlling the temperature of each temperature zone of an injection molding machine to be: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
Comparative example 2
100 parts of random copolymer polypropylene and 0.05 part of elastomer POE are respectively weighed according to parts by mass, and uniformly mixed to prepare a sample. The temperature control of each temperature zone of the injection molding machine is as follows: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
Comparative example 3
100 parts of random copolymer polypropylene and 0.1 part of elastomer POE are respectively weighed according to parts by mass, and uniformly mixed to prepare a sample. The temperature control of each temperature zone of the injection molding machine is as follows: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
Comparative example 4
100 parts of random copolymer polypropylene and 0.15 part of elastomer POE are respectively weighed according to parts by mass, and uniformly mixed to prepare a sample. The temperature control of each temperature zone of the injection molding machine is as follows: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
Test effect
The polypropylene material products of examples 1 to 5 and comparative examples 1 to 4 obtained were subjected to performance test, and the results are shown in Table 1 below:
TABLE 1 results of Performance test for comparative examples 1-4 and examples 1-5
The foregoing describes a method for improving the impact resistance of the polypropylene random copolymer according to the present invention in detail, and the foregoing is merely exemplary embodiments, and is not intended to limit the scope of the present invention, but the present invention is not limited thereto, and the present invention is not limited thereto.
Claims (10)
1. The method for improving the impact resistance of the random copolymer polypropylene is characterized by comprising the following steps of: mixing the random copolymer polypropylene and the high impact transparent polypropylene product according to the following proportion, and performing injection molding to prepare the high impact transparent polypropylene:
50-100 parts of random copolymer polypropylene;
50-400 parts of high-impact transparent polypropylene;
the normal temperature cantilever beam impact strength of the random copolymer polypropylene material is 3-10 kJ/m 2 The bending modulus is 800-1100 MPa;
the high-impact transparent polypropylene material is any one or more than two of random copolymer polypropylene, block copolymer polypropylene and homopolymerized polypropylene; the normal temperature cantilever beam impact strength of the high impact transparent polypropylene material is 8-35kJ/m 2 The flexural modulus is 800-1200MPa, and the melt index is 15-30g/10min.
2. The method for improving the impact resistance of random copolymer polypropylene according to claim 1, wherein the haze of the random copolymer polypropylene material is 8 to 17%.
3. The method for improving the impact resistance of random copolymer polypropylene according to claim 2, wherein the tensile yield stress of the random copolymer polypropylene material is 20 to 30MPa.
4. The method for improving the impact resistance of random copolymer polypropylene according to claim 1, wherein the high impact transparent polypropylene material has a tensile yield stress of 20 to 30MPa.
5. The method for improving the impact resistance of random copolymer polypropylene according to claim 4, wherein the high impact transparent polypropylene material has a haze of 8 to 15%.
6. The method for improving the impact resistance of random copolymer polypropylene according to any one of claims 1 to 5, wherein the injection molding preparation is carried out by an injection molding machine, the injection molding machine comprises four temperature zones, and each temperature is controlled as follows: one section 190-210 ℃, two sections 195-215 ℃, three sections 195-215 ℃ and four sections 190-210 ℃.
7. The method for improving the impact resistance of random copolymer polypropylene according to any one of claims 1 to 5, wherein the high impact transparent polypropylene material is prepared by a Spheripol secondary loop process, and the Spheripol secondary loop process equipment comprises a first loop reactor, a second loop reactor and a vertical gas-phase fluidized bed reactor.
8. The method for improving the impact resistance of random copolymer polypropylene according to claim 7, wherein the Spheripol second generation loop process adopts a ziegler-natta catalyst as a main catalyst system and triethylaluminum as a cocatalyst.
9. The method for improving the impact resistance of random copolymer polypropylene according to claim 8, wherein theIn the Spheripol second-generation loop process, preparing initial polypropylene powder in a first loop reactor and a second loop reactor; the temperature of the first loop reactor and the second loop reactor is 60-80 ℃, the reaction pressure is 3-5 MPa, the hydrogen concentration is 1500-3500 mg/kg, the ethylene addition amount is 1-10%, and the density of the loop slurry is 450-550 kg/m 3 。
10. The method for improving the impact resistance of random copolymer polypropylene according to claim 9, wherein in the Spheripol second generation loop process, the initial polypropylene powder reacts with propylene, ethylene and hydrogen in a vertical gas-phase fluidized bed reactor to obtain a high impact transparent polypropylene material; the vertical gas-phase fluidized bed has a gas-phase composition of ethylene/ethylene+propylene molar volume ratio of 0.1-0.5, a hydrogen/ethylene molar volume ratio of 0.4-0.7 and ethylene addition of 5-10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310623082.4A CN116891607A (en) | 2023-05-30 | 2023-05-30 | Method for improving impact resistance of random copolymer polypropylene |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310623082.4A CN116891607A (en) | 2023-05-30 | 2023-05-30 | Method for improving impact resistance of random copolymer polypropylene |
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| Publication Number | Publication Date |
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| CN116891607A true CN116891607A (en) | 2023-10-17 |
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| CN202310623082.4A Pending CN116891607A (en) | 2023-05-30 | 2023-05-30 | Method for improving impact resistance of random copolymer polypropylene |
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| Country | Link |
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| CN (1) | CN116891607A (en) |
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- 2023-05-30 CN CN202310623082.4A patent/CN116891607A/en active Pending
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