CN116715922A - High-rigidity high-impact polypropylene resin and preparation method thereof - Google Patents
High-rigidity high-impact polypropylene resin and preparation method thereof Download PDFInfo
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 63
- -1 polypropylene Polymers 0.000 title claims abstract description 63
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 63
- 229920005989 resin Polymers 0.000 title claims abstract description 45
- 239000011347 resin Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- 239000000178 monomer Substances 0.000 claims abstract description 19
- 239000002667 nucleating agent Substances 0.000 claims abstract description 18
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 16
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims abstract description 16
- 239000002253 acid Substances 0.000 claims abstract description 10
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 10
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 10
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000005977 Ethylene Substances 0.000 claims abstract description 9
- 239000006096 absorbing agent Substances 0.000 claims abstract description 9
- 239000012745 toughening agent Substances 0.000 claims abstract description 9
- 229920005629 polypropylene homopolymer Polymers 0.000 claims abstract description 8
- 239000003054 catalyst Substances 0.000 claims abstract description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000001257 hydrogen Substances 0.000 claims abstract description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 4
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 claims abstract description 4
- 230000000379 polymerizing effect Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 21
- 229910019142 PO4 Inorganic materials 0.000 claims description 6
- 150000007942 carboxylates Chemical class 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000010452 phosphate Substances 0.000 claims description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- SJJCABYOVIHNPZ-UHFFFAOYSA-N cyclohexyl-dimethoxy-methylsilane Chemical compound CO[Si](C)(OC)C1CCCCC1 SJJCABYOVIHNPZ-UHFFFAOYSA-N 0.000 claims description 3
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 3
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical group [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims description 2
- 235000013539 calcium stearate Nutrition 0.000 claims description 2
- 239000008116 calcium stearate Substances 0.000 claims description 2
- GDVKFRBCXAPAQJ-UHFFFAOYSA-A dialuminum;hexamagnesium;carbonate;hexadecahydroxide Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Mg+2].[Al+3].[Al+3].[O-]C([O-])=O GDVKFRBCXAPAQJ-UHFFFAOYSA-A 0.000 claims description 2
- VHPUZTHRFWIGAW-UHFFFAOYSA-N dimethoxy-di(propan-2-yl)silane Chemical compound CO[Si](OC)(C(C)C)C(C)C VHPUZTHRFWIGAW-UHFFFAOYSA-N 0.000 claims description 2
- 229960001545 hydrotalcite Drugs 0.000 claims description 2
- 229910001701 hydrotalcite Inorganic materials 0.000 claims description 2
- 229920001684 low density polyethylene Polymers 0.000 claims description 2
- 239000004702 low-density polyethylene Substances 0.000 claims description 2
- ZHROMWXOTYBIMF-UHFFFAOYSA-M sodium;1,3,7,9-tetratert-butyl-11-oxido-5h-benzo[d][1,3,2]benzodioxaphosphocine 11-oxide Chemical compound [Na+].C1C2=CC(C(C)(C)C)=CC(C(C)(C)C)=C2OP([O-])(=O)OC2=C1C=C(C(C)(C)C)C=C2C(C)(C)C ZHROMWXOTYBIMF-UHFFFAOYSA-M 0.000 claims description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 4
- 230000008092 positive effect Effects 0.000 abstract description 3
- 229920006026 co-polymeric resin Polymers 0.000 abstract description 2
- 239000002861 polymer material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 8
- 238000007334 copolymerization reaction Methods 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011143 downstream manufacturing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 229920000092 linear low density polyethylene Polymers 0.000 description 1
- 239000004707 linear low-density polyethylene Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 229920005606 polypropylene copolymer Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 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
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/04—Monomers containing three or four carbon atoms
- C08F210/06—Propene
-
- 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
- C08L2205/24—Crystallisation aids
-
- 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
Abstract
A high-rigidity high-impact polypropylene resin and a preparation method thereof belong to the field of high polymer materials. Firstly, taking propylene monomer, hydrogen and an external electron donor as raw materials, and polymerizing under the action of a prepolymerization catalyst to obtain homopolypropylene; then adding ethylene monomer, isopropyl alcohol and triethylaluminum for polymerization to obtain propylene copolymer resin; then adding the stiffening nucleating agent, the antioxidant, the toughening agent and the acid absorber, extruding and granulating to obtain the high-rigidity high-impact polypropylene resin, the comprehensive property of which isGood performance, low application cost, easy processing and forming, and the notch impact strength of the simply supported beam is more than or equal to 50kJ/m 2 The flexural modulus is more than or equal to 1000MPa. The high-rigidity high-impact polypropylene resin has positive effects on improving the rigidity modulus of products by the added external electron donor and the rigidity-increasing nucleating agent, and particularly has a key effect on improving the impact resistance of the products by the rigidity-increasing nucleating agent.
Description
Technical Field
The invention belongs to the field of high polymer materials, and particularly relates to a high-rigidity high-impact polypropylene resin and a preparation method thereof.
Background
In recent years, with the development of fields of automobiles, household appliances, toys, daily necessities, industrial containers and the like, the demand for high-rigidity high-impact-resistance polypropylene resin is promoted to increase, and the trend of increasing the requirement on the rigidity modulus of impact-resistance polypropylene in addition to the high requirement on the impact strength is presented, so that the high-rigidity high-impact-resistance polypropylene product with balanced rigidity and toughness is increasingly popular with customers.
The market of high-rigidity high-impact polypropylene has rapidly increased in recent years, and the average growth speed of the polypropylene in nearly five years is obviously superior to that of the polypropylene, so that the polypropylene becomes an important raw material in the polypropylene consumption field. Although the newly built polypropylene device in China mostly adopts more advanced production technology and the scale reaches the world level, the structural shortage and surplus of the polypropylene industry in China coexist. The domestic high-rigidity high-impact polypropylene product still has a certain gap with abroad, and particularly has a larger gap with advanced abroad enterprises. The impact performance and the rigidity modulus cannot meet the urgent demands of customers, the requirements of post-processing on the polypropylene resin are higher and higher, but the impact performance of polypropylene can be greatly reduced under the condition of high modulus, so that the downstream processing users are puzzled, and processing enterprises often adopt different types of polypropylene resins for modification or compounding to meet the requirements of the impact and the rigidity modulus, but the requirements of the impact and the rigidity modulus are often changed. Developing a high-rigidity high-impact polypropylene product suitable for users is a new subject faced by various manufacturers.
The traditional high-rigidity high-impact polypropylene is usually obtained by modifying the polypropylene copolymer, and the outstanding problem in use at present is that the impact property and rigidity modulus of the polypropylene cannot meet the use requirements at the same time. The rubber phase is added into the polypropylene matrix, so that the impact resistance is improved, but the rigidity is poor, the bending modulus is low, and the requirements of various fields cannot be met.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a high-rigidity high-impact polypropylene resin and a preparation method thereof. The high-rigidity high-impact polypropylene resin is obtained by polymerizing propylene monomer and ethylene monomer under the action of a prepolymerization catalyst, and has the advantages of good comprehensive performance, low application cost and easy processing and molding.
The MFR (melt index, test condition 230 ℃,2.16 kg) of the high-rigidity high-impact polypropylene resin is 0.7-36 g/10min, preferably 1.5-21 g/10min (the product with the melt index of 21g/10min can be obtained under the condition of 68g/kg propylene monomer) and the notched impact strength of a simple beam is more than or equal to 50kJ/m 2 The flexural modulus is more than or equal to 1000MPa.
The preparation method of the high-rigidity high-impact polypropylene resin comprises the following steps:
1) Adding propylene monomer, hydrogen (the hydrogen is a molecular weight regulator, the dosage is 8-50 g/kg propylene monomer) and an external electron donor (one or more of cyclohexylmethyldimethoxy silane, tetraethoxy silane and diisopropyldimethoxy silane are compounded, the dosage is 0.003-0.02% of the mass of the propylene monomer), and adding a prepolymerization catalyst (consisting of titanium tetrachloride and magnesium chloride, wherein the mass ratio of the two is 1:2 to 6; the dosage of the prepolymerization catalyst is 25-45 g/ton propylene monomer), and the homopolymerized polypropylene is obtained by polymerization reaction (polymerization temperature is 75-85 ℃, polymerization pressure is 1.5-3.0 MPa, and polymerization time is 0.8-1.5 hours);
2) Adding ethylene monomer (the mass dosage of the added ethylene monomer is 10-21% of that of the homo-polypropylene) into the homo-polypropylene obtained in the step 1), and carrying out polymerization reaction on isopropanol and TEA (auxiliary catalyst triethylaluminum) (the polymerization pressure is 1.5-3.0 MPa, the polymerization temperature is 70-80 ℃ and the polymerization time is 0.4-0.7 hours) to obtain propylene copolymer resin; the mass dosage of the isopropanol is 0.05 to 0.25 percent of that of the homopolymerized polypropylene, and the mass dosage ratio of the isopropanol to the TEA is 0.3 to 0.6:1, a step of;
3) Adding a stiffening nucleating agent, an antioxidant, a toughening agent and an acid absorber into the copolymerized polypropylene resin obtained in the step 2), and extruding and granulating to obtain the high-rigidity high-impact polypropylene resin; the weight content of the stiffening nucleating agent in each ton of the high-rigidity high-impact polypropylene resin is 0.02-0.8%, the weight content of the antioxidant is 0.09-0.20%, the weight content of the toughening agent is 5-10%, and the weight content of the acid absorber is 0.01-0.17%.
The high-rigidity high-impact polypropylene resin disclosed by the invention has positive effects on improving the rigidity modulus of a product by adding the external electron donor and the rigidity-increasing nucleating agent, and particularly plays a key role in improving the impact resistance of the product by the rigidity-increasing nucleating agent. Compared with common impact polypropylene, the resin has high content of impact copolymerization part, good dispersion, and can effectively block cracks, and simultaneously ensures that the rigidity modulus of the polypropylene resin is kept at a higher level under the action of the organic and inorganic composite stiffening nucleating agents. Due to the characteristics, the resin provided by the invention has the characteristics of high impact resistance and high rigidity modulus.
The stiffening nucleating agent used in the invention is a mixture of organic carboxylate or phosphate (one of aluminum arylcarboxylate, calcium arylcarboxylate or sodium 2,2' -methylenebis (4, 6-di-tert-butylphenyl) phosphate) and rigid inorganic matters (one of superfine talcum powder and superfine calcium carbonate), and the mass ratio of the organic carboxylate or phosphate to the rigid inorganic matters is 10:1 to 5.
The toughening agent (which is used for increasing the impact strength of the simply supported beams of the resin) is one or two of low-density polyethylene (LLDPE) or ethylene octene copolymer (POE).
The acid absorber used in the invention (the acid absorber is used for absorbing acid substances generated in the extrusion granulation process so as to prevent resin from decomposing) is one or two of superfine hydrotalcite or stearate (calcium stearate or zinc stearate).
The antioxidant used in the invention (the function is to prevent polypropylene from being heated and decomposed by contact with oxygen in the processing process) is a composite antioxidant, and the antioxidant marks 1010 and 626 are formed by mixing 50 percent: 50% by mass of a mixture.
The notch impact strength of the simply supported beam of the high-rigidity high-impact polypropylene resin is more than or equal to 50kJ/m 2 The flexural modulus is more than or equal to 1000Mpa, can be used for heavy crates, household plastic products, household electrical appliance parts and the like, and can realize the dual effects of high rigidity and high impact resistance.
The invention has the following advantages:
(1) The invention is a high rigidity high impact polypropylene resin obtained by copolymerization of propylene monomer and ethylene monomer, wherein the mass dosage of the added ethylene monomer is 10-21% of that of homo-polypropylene, and the homo-polypropylene is polymerized into the co-polypropylene under the action of a pre-polymerization catalyst.
(2) The external electron donor and the stiffening nucleating agent have positive effects on improving the rigidity modulus of the final product, and compared with the common impact polypropylene, the resin has high content of the impact copolymerization part, good dispersion and capability of effectively blocking cracks, and simultaneously ensures that the rigidity modulus of the polypropylene resin is kept at a higher level under the action of the stiffening nucleating agent.
(3) The polypropylene resin obtained by the invention has high rigidity modulus and good impact resistance, and meanwhile, the isopropanol is used to enable the rubber content to be more controllable, so that the polypropylene resin can meet the requirements of heavy crates, household plastic products, household electrical appliance parts and the like, and can realize the dual effects of high rigidity and high impact resistance.
Detailed Description
The present invention will be further described with reference to the following specific examples and comparative examples, but the scope of the present invention is not limited to the examples. The examples are illustrative and are intended to be illustrative of the invention and are not to be construed as limiting the invention. The chemical auxiliary agents used in the examples and the comparative examples are all commercially available, and propylene and ethylene are self-produced by the applicant. The impact and modulus values in the comparative examples and examples were measured by a simple beam impact tester and a universal tester, and the operation method will not be described in detail. The invention is further illustrated below with reference to examples.
Examples 1 to 3:
the invention is carried out in 30 ten thousand tons/year vertical stirred reactors connected in series, the first reactor having a polymer content of 78% and the second reactor having a polymer content of 22%, and the apparatus for carrying out the invention includes but is not limited to this apparatus.
In the embodiment, a prepolymerization catalyst and an external electron donor are adopted, propylene and ethylene are introduced into a reactor for copolymerization, the obtained polymer and an additive are granulated by a parallel double-screw extruder, and a stiffening nucleating agent, a toughening agent, an acid absorber and an antioxidant are adopted in the granulating process (the stiffening nucleating agent used in the embodiment is a mixture of aryl aluminum carboxylate and superfine talcum powder, the mass ratio is 70 percent to 30 percent), so that the final high-rigidity high-impact polypropylene resin product is obtained. The external electron donor used was cyclohexylmethyldimethoxysilane.
Examples 1-3 prepared a high stiffness high impact polypropylene resin with raw material composition and amounts and product performance indices as shown in Table 1. The properties of the high-rigidity high-impact polypropylene resin are shown in the results of the property analysis of the products in Table 1.
The standard and method adopted by the product performance test are carried out according to GB/national standard.
Table 1: examples 1 to 3 raw material components and amounts and product Performance index
Comparative examples 1 to 2:
the process conditions were the same as in examples 1 to 3, the raw material components and amounts and the product performance index are shown in Table 2, and no stiffening nucleating agent was added in comparative examples 1 to 2.
Table 2: comparative examples 1 to 2 raw material components and amounts and performance index of products
As can be seen from tables 1 and 2, after the organic carboxylate or phosphate and the toughening agent are added into the stiffening nucleating agent in examples 1-3, the flexural modulus in the prepared high-rigidity high-impact polypropylene product index is obviously improved compared with that in comparative examples 1-2, and the flexural modulus is improved and the impact strength of the simply supported beam is also slightly improved. In example 2, it can be seen that the impact strength of the high-rigidity high-impact polypropylene resin exceeds 60kJ/m 2 The flexural modulus exceeds 1150MPa, which is obviously better than that of comparative examples 1-2.
Claims (9)
1. A preparation method of high-rigidity high-impact polypropylene resin comprises the following steps:
1) Adding propylene monomer, hydrogen with the dosage of 8-50 g/kg propylene monomer and an external electron donor with the dosage of 0.003-0.02% of the mass of the propylene monomer into a reaction device, and polymerizing under the action of a prepolymerization catalyst with the dosage of 25-45 g/ton propylene monomer to obtain homopolypropylene;
2) Adding ethylene monomer, isopropanol and triethylaluminum which are 10-21% of the mass of the homo-polypropylene into the homo-polypropylene obtained in the step 1) to perform polymerization reaction to obtain a copolymer polypropylene resin; the mass dosage of the isopropanol is 0.05 to 0.25 percent of that of the homopolymerized polypropylene, and the mass dosage ratio of the isopropanol to the triethylaluminum is 0.3 to 0.6:1, a step of;
3) Adding a stiffening nucleating agent, an antioxidant, a toughening agent and an acid absorber into the copolymerized polypropylene resin obtained in the step 2), and extruding and granulating to obtain the high-rigidity high-impact polypropylene resin; the weight content of the stiffening nucleating agent in each ton of the high-rigidity high-impact polypropylene resin is 0.02-0.8%, the weight content of the antioxidant is 0.09-0.20%, the weight content of the toughening agent is 5-10%, and the weight content of the acid absorber is 0.01-0.17%.
2. The method for preparing the high-rigidity and high-impact polypropylene resin according to claim 1, wherein the method comprises the following steps: the external electron donor is one or more of cyclohexyl methyl dimethoxy silane, tetraethoxy silane and diisopropyl dimethoxy silane.
3. The method for preparing the high-rigidity and high-impact polypropylene resin according to claim 1, wherein the method comprises the following steps: the stiffening nucleating agent is a mixture of organic carboxylate or phosphate and rigid inorganic matters, and the mass ratio of the organic carboxylate or phosphate to the rigid inorganic matters is 10: 1-5, wherein the organic carboxylate or phosphate is one of aluminum arylcarboxylate, calcium arylcarboxylate or sodium 2,2' -methylenebis (4, 6-di-tert-butylphenyl) phosphate, and the rigid inorganic matter is one of superfine talcum powder and superfine calcium carbonate.
4. The method for preparing the high-rigidity and high-impact polypropylene resin according to claim 1, wherein the method comprises the following steps: the toughening agent is one or two of low-density polyethylene or ethylene octene copolymer.
5. The method for preparing the high-rigidity and high-impact polypropylene resin according to claim 1, wherein the method comprises the following steps: the acid absorber is one or two of superfine hydrotalcite and stearate.
6. The method for preparing the high-rigidity and high-impact polypropylene resin according to claim 5, wherein the method comprises the following steps: the stearate is calcium stearate or zinc stearate.
7. The method for preparing the high-rigidity and high-impact polypropylene resin according to claim 5, wherein the method comprises the following steps: the antioxidant is 1010 and 626 according to 50 percent: 50% by mass of a mixture.
8. The method for preparing the high-rigidity and high-impact polypropylene resin according to claim 1, wherein the method comprises the following steps: the polymerization temperature of the step 1) is 75-85 ℃, the polymerization pressure is 1.5-3.0 MPa, and the polymerization time is 0.8-1.5 hours; the polymerization pressure of the step 2) is 1.5-3.0 MPa, the polymerization temperature is 70-80 ℃ and the polymerization time is 0.4-0.7 hour.
9. A high-rigidity high-impact polypropylene resin is characterized in that: is prepared by the method of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310947888.9A CN116715922A (en) | 2023-07-31 | 2023-07-31 | High-rigidity high-impact polypropylene resin and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310947888.9A CN116715922A (en) | 2023-07-31 | 2023-07-31 | High-rigidity high-impact polypropylene resin and preparation method thereof |
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| CN116715922A true CN116715922A (en) | 2023-09-08 |
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| CN202310947888.9A Pending CN116715922A (en) | 2023-07-31 | 2023-07-31 | High-rigidity high-impact polypropylene resin and preparation method thereof |
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| Country | Link |
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- 2023-07-31 CN CN202310947888.9A patent/CN116715922A/en active Pending
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