CN116948100A - High-grafting-rate polypropylene grafted itaconic anhydride material, preparation method and application - Google Patents
High-grafting-rate polypropylene grafted itaconic anhydride material, preparation method and application Download PDFInfo
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 169
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 168
- OFNISBHGPNMTMS-UHFFFAOYSA-N 3-methylideneoxolane-2,5-dione Chemical compound C=C1CC(=O)OC1=O OFNISBHGPNMTMS-UHFFFAOYSA-N 0.000 title claims abstract description 153
- -1 polypropylene Polymers 0.000 title claims abstract description 128
- 239000000463 material Substances 0.000 title claims abstract description 106
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000002156 mixing Methods 0.000 claims abstract description 104
- 238000000034 method Methods 0.000 claims abstract description 58
- 230000008569 process Effects 0.000 claims abstract description 27
- 238000001125 extrusion Methods 0.000 claims abstract description 25
- 239000011347 resin Substances 0.000 claims abstract description 25
- 229920005989 resin Polymers 0.000 claims abstract description 25
- 230000015556 catabolic process Effects 0.000 claims abstract description 24
- 239000002131 composite material Substances 0.000 claims abstract description 24
- 238000006731 degradation reaction Methods 0.000 claims abstract description 24
- 239000003999 initiator Substances 0.000 claims abstract description 24
- 239000003112 inhibitor Substances 0.000 claims abstract description 23
- 150000002978 peroxides Chemical class 0.000 claims abstract description 21
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 48
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 27
- 239000002994 raw material Substances 0.000 claims description 19
- 238000005469 granulation Methods 0.000 claims description 12
- 230000003179 granulation Effects 0.000 claims description 12
- 229920000098 polyolefin Polymers 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- XYFRHHAYSXIKGH-UHFFFAOYSA-N 3-(5-methoxy-2-methoxycarbonyl-1h-indol-3-yl)prop-2-enoic acid Chemical compound C1=C(OC)C=C2C(C=CC(O)=O)=C(C(=O)OC)NC2=C1 XYFRHHAYSXIKGH-UHFFFAOYSA-N 0.000 claims description 6
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 claims description 6
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 5
- 238000000265 homogenisation Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- UHOVQNZJYSORNB-UHFFFAOYSA-N monobenzene Natural products C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229920005629 polypropylene homopolymer Polymers 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 claims description 2
- 229920001400 block copolymer Polymers 0.000 claims 1
- 229920005606 polypropylene copolymer Polymers 0.000 claims 1
- 229920005604 random copolymer Polymers 0.000 claims 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 abstract description 21
- 239000002861 polymer material Substances 0.000 abstract description 6
- 230000009257 reactivity Effects 0.000 abstract description 6
- 238000012661 block copolymerization Methods 0.000 description 18
- 241000196324 Embryophyta Species 0.000 description 16
- 241000209140 Triticum Species 0.000 description 13
- 235000021307 Triticum Nutrition 0.000 description 13
- 235000013312 flour Nutrition 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000243 solution Substances 0.000 description 9
- KJFMBFZCATUALV-UHFFFAOYSA-N phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 description 8
- 238000004448 titration Methods 0.000 description 8
- 230000006872 improvement Effects 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 238000009835 boiling Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 239000012086 standard solution Substances 0.000 description 3
- 230000021615 conjugation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004630 mental health Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- OVYTZAASVAZITK-UHFFFAOYSA-M sodium;ethanol;hydroxide Chemical compound [OH-].[Na+].CCO OVYTZAASVAZITK-UHFFFAOYSA-M 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- 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
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
-
- 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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/08—Polymer mixtures characterised by other features containing additives to improve the compatibility between two polymers
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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)
- Graft Or Block Polymers (AREA)
Abstract
The application discloses a high-grafting-rate polypropylene grafted itaconic anhydride material, a preparation method and application thereof, and belongs to the technical field of interfacial compatilizers. The high-grafting-rate polypropylene grafted itaconic anhydride material comprises the following components in parts by weight: 100 parts of polypropylene resin; 0.2-1 part of peroxide initiator; 3-9 parts of itaconic anhydride; 0.1-0.3 parts of degradation inhibitor. The preparation method of the high-grafting-rate polypropylene grafted itaconic anhydride material comprises the step of preparing the polypropylene grafted itaconic anhydride material through an internal mixing melt blending process or a double-screw melt extrusion blending process. The method can realize the utilization of itaconic anhydride with higher reactivity, successfully solve the problem of low grafting rate of maleic anhydride, and greatly improve the interfacial compatibility of the plant composite polymer material.
Description
Technical Field
The application belongs to the technical field of interfacial compatilizers, and particularly relates to a high-grafting-rate polypropylene grafted itaconic anhydride material, a preparation method and application.
Background
With the development of society, plant composite polymer materials are increasingly valued by various industries, and have wide application prospect and huge market; however, as the plant components contain a large amount of hydrophilic hydroxyl groups, and the polymer materials such as PP, PE, ABS and the like are hydrophobic materials, the interface compatibility of the two materials is poor, and the mechanical properties of the polymer materials are greatly reduced due to the fact that the plant components are added and are better than the interface incompatibility, so that the application of the plant composite polymer is limited; among them, polypropylene (PP) materials become the most used matrix in the plant composite polymer materials with the advantages of low density, low hygroscopicity, excellent mechanical properties, low cost, etc., and as the first of five general plastics, how to promote its interfacial compatibility becomes a key problem.
At present, the most common and universal method for improving the interfacial compatibility of the plant composite PP material is to add a polypropylene grafted maleic anhydride compatilizer into the composite material, and the method has the advantages of being provided with hydrophilic and hydrophobic functional groups at the same time, being capable of improving the interfacial compatibility of plant components and PP, being low in price and easy to obtain; however, as maleic anhydride has the conjugation effect of C=C and C=O, the reactivity is lower, and the grafting rate of the commercial maleic anhydride grafting compatilizer in China is below 0.7%, so that the grafting rate is low, a large amount of maleic anhydride is needed in the production process, and the production cost is increased; and the boiling point of maleic anhydride is only 202 ℃, and is close to or even exceeds the boiling point of maleic anhydride in the grafting reaction process, so that a large amount of maleic anhydride is lost, the maleic anhydride has pungent odor, and the volatilized pungent odor fills a production workshop, pollutes the production environment and influences the working environment and physical and mental health of workshop staff.
Disclosure of Invention
The application aims to solve the technical problem of providing a high-grafting-rate polypropylene grafted itaconic anhydride material, a preparation method and application thereof, which can successfully solve the problem of low grafting rate of maleic anhydride by using itaconic anhydride with higher reactivity, and simultaneously greatly improve the interfacial compatibility of a plant composite polymer material.
The application discloses a high-grafting-rate polypropylene grafted itaconic anhydride material, which comprises the following components in parts by mass:
100 parts of polypropylene resin;
0.2-1 part of peroxide initiator;
3-9 parts of itaconic anhydride;
0.1 to 0.3 part of degradation inhibitor.
As a further improvement of the present application, the polypropylene resin includes one or more of homo-polypropylene, random co-polypropylene and block co-polypropylene; the melt index of the polypropylene resin is 2-50 g/10min (230 ℃,2.16 kg).
As a further improvement of the present application, the peroxide initiator comprises one or more of dicumyl peroxide, 1, 4-di-tert-butylperoxyisopropyl benzene, di-tert-butyl peroxide and tert-butyl peroxyacetate.
As a further improvement of the present application, the itaconic anhydride is an all bio-based itaconic anhydride, the itaconic anhydride being prepared by fermentation of plants.
As a further improvement of the present application, the degradation inhibitor includes one or both of styrene and α -methylstyrene.
A method for preparing a high-grafting-rate polypropylene grafted itaconic anhydride material by banburying and melt blending, which is a method for preparing a high-grafting-rate polypropylene grafted itaconic anhydride material according to any of claims 1 to 5, and is characterized in that: the polypropylene grafted itaconic anhydride material is prepared by a banburying and melt blending process, and comprises the following steps:
s1: weighing the following raw materials in parts by mass: uniformly mixing polypropylene resin, a peroxide initiator, itaconic anhydride and a degradation inhibitor;
s2: the evenly mixed raw materials are fed into an internal mixer through a feeding port for internal mixing and melting;
s3: granulating the material subjected to banburying and melt blending by a short single screw extruder;
s4: obtaining the polypropylene grafted itaconic anhydride material.
As a further improvement of the application, the mixing equipment in the step S1 is selected from a three-dimensional blending equipment, a vertical middle-low speed mixing equipment and a horizontal middle-low speed mixing equipment; the banburying parameters in the step S2 are that the temperature is 170-220 ℃, the banburying time is 5-15 min, and the rotating speed of the rotor is 50-100 rpm; the single screw extrusion granulation parameter in the step S3 is 160-200 ℃ and the rotating speed is 200-500 rpm.
A preparation method of a high-grafting-rate polypropylene grafted itaconic anhydride material by adopting twin-screw melt extrusion blending, which is a preparation method of a high-grafting-rate polypropylene grafted itaconic anhydride material according to any of claims 1 to 5, and is characterized in that: the polypropylene grafted itaconic anhydride material is prepared by a double-screw melt extrusion blending process, and comprises the following steps:
z1: weighing the raw materials according to the parts by weight, and uniformly mixing polypropylene resin, a peroxide initiator, itaconic anhydride and a degradation inhibitor;
z2: the evenly mixed raw materials are fed into a double-screw extruder through a feeding port, and are subjected to melt blending extrusion granulation through double screws;
z3: vibration screening and homogenization are carried out on the extruded and granulated material;
z4: obtaining the polypropylene grafted itaconic anhydride material.
As a further improvement of the application, the mixing equipment in the step Z1 is selected from a three-dimensional blending equipment, a vertical middle-low speed mixing equipment and a horizontal middle-low speed mixing equipment; the technological parameters in the step Z2 are that the length-diameter ratio of the screw is 40-60, the extrusion temperature is 160-220 ℃, and the screw rotating speed is 200-400 rpm; the technological parameter of the step Z3 is homogenization time of 2-4 hours, and the discharging temperature is less than or equal to 40 ℃.
The application of the high-grafting-rate polypropylene grafted itaconic anhydride material is that the high-grafting-rate polypropylene grafted itaconic anhydride material is applied to a plant fiber/powder composite polyolefin material; the adding proportion of the polypropylene grafted itaconic anhydride material is 1% -4%; the proportion of the plant fiber/powder composite polyolefin material is 10-40%.
Compared with the prior art, the application has the beneficial effects that:
(1) Compared with maleic anhydride, the itaconic anhydride selected by the application has lower conjugation effect of C=C and C=O, and the side chain is vinyl group, so that the itaconic anhydride has better flexibility, higher reactivity and better molecular chain flexibility, and better interface compatibility is achieved; the prepared polypropylene grafted itaconic anhydride has the advantages of high grafting rate (the highest grafting rate can reach more than 2 percent, and the grafting rate of the commercial maleic anhydride grafting compatilizer in China is below 0.7 percent) and low residual rate;
(2) The prepared polypropylene grafted itaconic anhydride is applied to polyolefin materials such as plant composite PP, and the interfacial compatibility and mechanical properties of the composite materials can be greatly improved;
(3) The itaconic anhydride selected by the application is mainly obtained by plant fermentation, and has the advantages of environmental protection and low carbon; meanwhile, the itaconic anhydride has higher boiling point and no pungent odor, and compared with maleic anhydride which has low boiling point, is easy to volatilize and has the pungent odor, the itaconic anhydride cannot bring a large amount of raw materials lost due to volatilization in the production process, the production condition and the production cost are reduced, and meanwhile, the pungent odor cannot be generated, and the workshop environment and the physical and mental health of staff are maintained.
Drawings
FIG. 1 is a schematic flow diagram of the banburying melt blending process of the present application;
FIG. 2 is a schematic flow diagram of a twin screw melt extrusion blending process of the present application;
FIG. 3 is a schematic flow chart of the process of the present application for obtaining purified grafts;
FIG. 4 is a graph showing the data trend of the purified grafting ratio corresponding to PP-g-ITA obtained in various amounts of itaconic anhydride added according to the present application (examples 1 to 4 and examples 13 to 16) and PP-g-MAH obtained in comparative examples one and two;
FIG. 5 is a cross-sectional image of the wheat flour composite PP material of the application without the addition of the compatibilizer, the PP-g-MAH prepared in comparative example I and the PP-g-ITA prepared in example II;
FIG. 6 is a graph showing the notched Izod impact strength at ambient temperature of PP-g-ITA materials prepared in examples two with 0%,1%,2% and 4% of the wheat flour composite PP material of the application.
Detailed Description
First embodiment: in order to improve the defects of the prior art and improve the prior art, the embodiment provides a high-grafting-rate polypropylene grafted itaconic anhydride material, which comprises the following components in parts by mass:
100 parts of polypropylene resin;
0.2-1 part of peroxide initiator; preferably, the optimum addition amount of the initiator is 0.6 part;
3-9 parts of itaconic anhydride; preferably, the optimum addition amount of itaconic anhydride is 7 parts;
0.1 to 0.3 part of degradation inhibitor; preferably, the optimum addition amount of the degradation preventing agent is 0.2 parts.
Wherein the polypropylene resin comprises one or more of homo-polypropylene, random co-polypropylene and block co-polypropylene; preferably, the melt index of the polypropylene resin is 2-50 g/10min (230 ℃,2.16 kg);
the peroxide initiator comprises one or more of dicumyl peroxide (DCP), 1, 4-di-tert-butyl peroxyisopropyl benzene (BIBP), di-tert-butyl peroxide (DTBP) and tert-butyl peroxyacetate (TBPA); preferably, the optimal peroxide initiator is of the DCP type;
the itaconic anhydride is full bio-based itaconic anhydride, and is obtained by fermenting plants;
the degradation inhibitor comprises one or two of styrene and alpha-methyl styrene; preferably, the most preferred degradation inhibitor is styrene.
The high-grafting-rate polypropylene grafted itaconic anhydride material is prepared by an internal mixing melt blending process, and concretely, the preparation method of the high-grafting-rate polypropylene grafted itaconic anhydride material comprises the following steps:
s1: weighing the raw materials according to the parts by weight, and uniformly mixing polypropylene resin, a peroxide initiator, itaconic anhydride and a degradation inhibitor;
specifically, the machine for mixing is one of three-dimensional blending equipment, vertical medium-low speed mixing equipment and horizontal medium-low speed mixing equipment, and the mixing speed of polypropylene resin, peroxide initiator, itaconic anhydride and degradation inhibitor is selected to be medium-low speed mixing;
s2: the evenly mixed raw materials are fed into an internal mixer through a feeding port for internal mixing and melting; wherein, the banburying parameters are as follows: the temperature is 170-220 ℃, the banburying time is 5-15 min, and the rotating speed of the rotor is 50-100 rpm;
s3: granulating the material subjected to banburying and melt blending by a short single screw extruder; wherein, single screw extrusion granulation parameters are as follows: the temperature is 160-200 ℃, and the rotating speed is 200-500 rpm;
s4: obtaining the polypropylene grafted itaconic anhydride material.
It should be noted that the obtained polypropylene grafted itaconic anhydride material can be applied to a plant fiber/powder composite polyolefin material, and preferably, the obtained polypropylene grafted itaconic anhydride material can be applied to a wheat flour composite PP material; wherein, the proportion of the added polypropylene grafted itaconic anhydride material is 1 to 4 percent, and the proportion of the wheat flour is 10 to 40 percent.
Specific embodiment II: in a distinction from the specific embodiment,
the high-grafting-rate polypropylene grafted itaconic anhydride material is prepared by a double-screw melt extrusion blending process, and concretely, the preparation method of the high-grafting-rate polypropylene grafted itaconic anhydride material comprises the following steps:
z1: weighing the raw materials according to the parts by weight, and uniformly mixing polypropylene resin, a peroxide initiator, itaconic anhydride and a degradation inhibitor;
specifically, the machine for mixing is one of three-dimensional blending equipment, vertical medium-low speed mixing equipment and horizontal medium-low speed mixing equipment, and the mixing speed of polypropylene resin, peroxide initiator, itaconic anhydride and degradation inhibitor is selected to be medium-low speed mixing;
z2: the evenly mixed raw materials are fed into a double-screw extruder through a feeding port, and are subjected to melt blending extrusion granulation through double screws; wherein, the technological parameters of the process are as follows: the length-diameter ratio of the screw is 40-60, the extrusion temperature is 160-220 ℃, and the screw rotating speed is 200-400 rpm;
z3: vibration screening and homogenization are carried out on the extruded and granulated material; wherein, the technological parameters of the process are as follows: homogenizing for 2-4 h, wherein the discharging temperature is less than or equal to 40 ℃;
z4: obtaining the polypropylene grafted itaconic anhydride material.
The preparation methods and applications described in the first and second embodiments of the present application are also applicable to resin grafting techniques for polyethylene, polyurethane, nylon, and other materials.
In order to demonstrate the high grafting rate of the preparation method of the polypropylene grafted itaconic anhydride material in the first and second embodiments, the following experimental examples and comparative examples were performed; the raw materials used in the following experimental examples and comparative examples were derived from the mature market and were existing raw materials.
The method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material comprises two steps of purification and determination;
the purification method of the polypropylene grafted itaconic anhydride material comprises the following steps:
a1: taking 5g of graft, putting the graft into 40-250 ml of boiling xylene, heating and refluxing for dissolution;
a2: after the grafts are completely dissolved, pouring the mixture into the stirring absolute ethyl alcohol in a fume hood while the mixture is hot, standing and cooling, filtering the mixture, and washing the precipitate for 2 to 3 times by adopting the absolute ethyl alcohol until the filtrate is clear and transparent;
a3: and (3) drying the obtained floccule in an oven to obtain the purified graft, wherein the drying time is 12-48 h, and the drying temperature is 60-90 ℃.
The method for measuring the grafting rate of the purified polypropylene grafted itaconic anhydride material comprises the following steps:
b1: dissolving: accurately weighing 0.5 g+/-0.01 g of the purified graft, placing the purified graft into a 250mL three-neck flask, adding 40-100 mL of dimethylbenzene, heating and refluxing for 10-30 min until the graft is completely dissolved, cooling to 80 ℃, slightly lifting the device, adding two drops of phenolphthalein indicator into a rubber head dropper, adding about 3mL of an OH-absolute ethyl alcohol standard solution into the rubber head dropper, recording the actual added volume, marking as V1, opening a glass plug at one side of the three-neck flask, rapidly adding 6mL of absolute ethyl alcohol solution, covering the glass plug, and enabling the solution to be dark red;
it should be noted that the solution cannot be flocculent precipitate in the process, and if the flocculent precipitate is precipitated, the solution is heated until the flocculent precipitate is dissolved.
B2: titration: the three-neck flask is subjected to constant temperature titration by adopting an HCl-absolute ethanol standard solution at the temperature of 80 ℃, is stirred, and stops titration when the solution turns to light pink, and the volume V2 of the HCI-absolute ethanol standard solution consumed is recorded;
it should be noted that in the titration process, when the color is changed into pink, stopping titration, adding one drop of phenolphthalein indicator, if the color of the solution is changed into red, continuing to add two drops of phenolphthalein indicator, and continuing to perform titration; if the color of the solution does not darken, no further phenolphthalein indicator is added dropwise.
B3: and (3) according to the titration data obtained in the steps B1 and B2, calculating according to the following formula to obtain the grafting ratio G:
wherein C is the concentration of NaOH-ethanol solution titration solution, the unit is mol/L, and m is the added mass of polypropylene grafted itaconic anhydride, and the unit is g.
Experimental example one: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 3 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 1.3%.
Experimental example two: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 5 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
the obtained graft was purified and the grafting ratio was measured according to the method for detecting the grafting ratio of the polypropylene grafted itaconic anhydride material, and the measured grafting ratio was 1.47%.
Experimental example three: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 7 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
the obtained graft was purified and the grafting ratio was measured according to the method for detecting the grafting ratio of the polypropylene grafted itaconic anhydride material, and the measured grafting ratio was 2.01%.
Experimental example four: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 9 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
the obtained graft was purified and the grafting ratio was measured according to the method for detecting the grafting ratio of the polypropylene grafted itaconic anhydride material, and the measured grafting ratio was 1.33%.
Experimental example five: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DTBP, 5 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 0.96%.
Experimental example six: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of BIBP, 5 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 0.87%.
Experimental example seven: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of TBPA, 5 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 1.03%.
Experimental example eight: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.4 part of DCP, 5 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 0.78%.
Experiment example nine: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.8 part of DCP/0.2 part of DCP/1 part of DCP, 5 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material and measuring the grafting rate, wherein the measured grafting rate is 1.03%/0.69%/0.98%.
Experimental example ten: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 5 parts of itaconic anhydride and 0.2 part of alpha-methyl styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 1.35%.
Experimental example eleven: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 5 parts of itaconic anhydride and 0.1 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 1.12%.
Experimental example twelve: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 5 parts of itaconic anhydride and 0.3 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 0.91%.
Comparative example one: polypropylene grafted maleic anhydride (hereinafter PP-g-MAH) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 5 parts of maleic anhydride and 0.2 part of styrene are uniformly mixed and then added into an internal mixer, wherein the internal mixing temperature is 200 ℃, the internal mixing rotating speed is 50RPM, and the internal mixing time is 10 minutes;
adding the banburying sample into a short single screw extruder for granulating by forced feeding, wherein the temperature of the single screw is 180 ℃, and the rotating speed of the screw is 300RPM, so that a graft is finally obtained;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 0.57%.
The polypropylene grafted itaconic anhydride material is prepared by banburying and melt blending processes in the first to thirteenth experimental examples and the first comparative example, and the following tables and conclusions are obtained by counting the raw materials and the parts by weight thereof used in the process flows of the first to thirteenth experimental examples and the first comparative example:
TABLE 1
(1) According to the data in Table 1, under the same process, the types and mass parts of the polypropylene resin, the peroxide initiator and the degradation inhibitor are controlled to be unchanged, 3 parts, 5 parts and 7 parts of itaconic anhydride are respectively added, so that the grafting rate is improved in sequence, and when the itaconic anhydride is added to 9 parts, the grafting rate is reduced instead, so that the optimal addition amount of the itaconic anhydride is 7 parts;
TABLE 2
(2) As shown in the data of table 2, under the same process, the types and mass parts of the polypropylene resin, itaconic anhydride and degradation inhibitor are controlled to be unchanged, and DCP, DTBP, BIBP, TBPA with the same mass parts is added as the peroxide initiator, respectively, so that the grafting rate is highest when DCP is used, and the optimal initiator type can be known as DCP;
TABLE 3 Table 3
(3) As shown in the data of table 3, under the same process, the grafting rates of the obtained polypropylene grafted itaconic anhydride were 0.69%, 0.78%, 1.47%, 1.03% and 0.98%, respectively, by adding 0.2 part, 0.4 part, 0.6 part and 0.8 part of DCP, respectively, while controlling the types and parts by mass of the polypropylene resin, itaconic anhydride and degradation inhibitor, respectively, and it was found that the grafting rate was the highest when 0.6 part of DCP was used, and thus it was found that the optimum initiator addition amount was 0.6 part;
TABLE 4 Table 4
(4) As shown in the data of table 4, under the same process, the types and mass parts of the polypropylene resin, itaconic anhydride and peroxide initiator are controlled to be unchanged, and styrene and alpha-methyl styrene with the same mass parts are added as the degradation inhibitor respectively, so that the grafting rate when styrene is used is higher than that when alpha-methyl styrene is used, and the optimal degradation inhibitor type is styrene;
TABLE 5
(5) As shown in the data of table 5, the optimum amount of the degradation inhibitor added was found to be 0.2 part by controlling the types and parts by mass of the polypropylene resin, itaconic anhydride and peroxide initiator to be unchanged and adding 0.1 part by mass, 0.2 part by mass and 0.3 part by mass of styrene respectively under the same process, and the grafting rate was found to be the highest when 0.2 part by mass of styrene was used;
TABLE 6
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(6) According to the data in Table 6, it can be seen that the grafting rate of itaconic anhydride is higher than that of maleic anhydride and the difference between the grafting rates is larger by controlling the types and the mass parts of the polypropylene resin, the peroxide initiator and the degradation inhibitor to be unchanged under the same process and adding the same mass parts of itaconic anhydride and maleic anhydride respectively, so that the itaconic anhydride has higher reactivity and is easier to graft with PP.
Experimental example thirteen: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 3 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed, and then added into a twin-screw machine for granulation, wherein the length-diameter ratio of screw is 42:1, extrusion temperature is 180-200 ℃, and screw rotation speed is 300rpm; homogenizing for 3h at 38deg.C to obtain graft;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 0.93%.
Experimental example fourteen: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 5 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed, and then added into a twin-screw machine for granulation, wherein the length-diameter ratio of screw is 42:1, extrusion temperature is 180-200 ℃, and screw rotation speed is 300rpm; homogenizing for 3h at 38deg.C to obtain graft;
the obtained graft was purified and the grafting ratio was measured according to the method for detecting the grafting ratio of the polypropylene grafted itaconic anhydride material, and the measured grafting ratio was 1.07%.
Experimental example fifteen: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 7 parts of itaconic anhydride and 0.2 part of acrylic acid are uniformly mixed, and then added into a twin-screw machine for granulation, wherein the length-diameter ratio of screw is 42:1, extrusion temperature is 180-200 ℃, and screw rotation speed is 300rpm; homogenizing for 3h at 38deg.C to obtain graft;
the obtained graft was purified and the grafting ratio was measured according to the method for detecting the grafting ratio of the polypropylene grafted itaconic anhydride material, and the measured grafting ratio was 1.27%.
Experimental example sixteen: the polypropylene grafted itaconic anhydride (hereinafter PP-g-ITA) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 9 parts of itaconic anhydride and 0.2 part of styrene are uniformly mixed, and then added into a twin-screw machine for granulation, wherein the length-diameter ratio of screw is 42:1, extrusion temperature is 180-200 ℃, and screw rotation speed is 300rpm; homogenizing for 3h at 38deg.C to obtain graft;
purifying the obtained graft according to the method for detecting the grafting rate of the polypropylene grafted itaconic anhydride material, and measuring the grafting rate, wherein the measured grafting rate is 0.98%.
Comparative example two: polypropylene grafted maleic anhydride (hereinafter PP-g-MAH) was prepared as follows: 100 parts of block copolymerization PP (4204), 0.6 part of DCP, 5 parts of maleic anhydride and 0.2 part of styrene are uniformly mixed, and then the mixture is added into a twin-screw machine for granulation, and the length-diameter ratio of screw is 42:1, extrusion temperature is 180-200 ℃, and screw rotation speed is 300rpm; homogenizing for 3h at 38deg.C to obtain graft;
the obtained graft was purified and the grafting ratio was measured according to the method for detecting the grafting ratio of the polypropylene grafted itaconic anhydride material, and the measured grafting ratio was 0.47%.
The polypropylene grafted itaconic anhydride material is prepared by a twin-screw melt extrusion blending process in the thirteenth to sixteenth and the second experimental examples, and the raw materials and the mass parts thereof used in the process flows of the first to fourth experimental examples, the thirteenth to sixteenth and the second experimental examples are counted to obtain the following tables and conclusions:
TABLE 7
(1) From the data in Table 7, it can also be known that the optimum addition amount of itaconic anhydride is 7 parts; comparing the data in tables 1 and 7 to obtain FIG. 4, it can be seen that the overall grafting ratio of the banburying-single screw process is generally higher than that of the twin screw extrusion process;
TABLE 8
(2) As shown in the data of Table 8, experimental example fourteen and comparative example II also prove that the itaconic anhydride has higher reactivity than maleic anhydride, and the itaconic anhydride is more easily grafted with PP, thereby having higher grafting rate.
In order to prove that the polypropylene grafted itaconic anhydride can be applied to polyolefin materials such as plant composite PP and the like, the interfacial compatibility and mechanical properties of the composite material can be greatly improved, seventeen experimental examples are carried out:
experimental example seventeen: the preparation method of the wheat flour composite PP material comprises the following steps: five parts of materials are prepared, each comprising 100 parts of block copolymerized PP (4204), 20 parts of wheat flour, 0.4 part of PE wax, 0.2 part of antioxidant 168, 0.2 part of antioxidant 1010, and PP-g-ITA prepared in experimental example two with the proportion of 0%,1%,2% and 4% and PP-g-MAH prepared in comparative example one with the proportion of 2% are respectively added into the five parts of materials to be mixed so as to obtain five parts of raw materials;
respectively adding the five mixed raw materials into a double-screw machine for granulation, wherein the length-diameter ratio of the screw is 42:1, extrusion temperature is 160-200 ℃, and screw rotation speed is 300rpm; homogenizing for 3h at 40deg.C; drying the composite material by a blast oven at the drying temperature of 80-100 ℃ for not less than 2 hours; after drying, preparing notch impact sample bars by an injection molding mode of an injection molding machine, wherein the injection molding temperature is 160-180 ℃, the injection pressure is 40MPa, and the injection speed is 40g/s; and (3) regulating for 16 hours at the temperature of 23+/-2 ℃ and in a 25% humidity environment, carrying out fracture scanning electron microscope characterization and cantilever beam notch impact strength test after liquid nitrogen brittle fracture, and finally obtaining the two results of the graph 5 and the graph 6.
As shown in the broken section of liquid nitrogen in FIG. 5, it can be seen that the composite PP material of the wheat flour without PP-g-ITA or PP-g-MAH has very obvious phase separation (larger gap between the two) between the wheat flour and the PP base material, and the interfacial compatibility between the two surfaces is very poor; the wheat flour added with 2 percent of PP-g-ITA is compounded with PP, and the interface between the wheat flour and the PP at the section is not obviously separated and is still in a tightly combined state; the wheat flour composite PP added with 2% of the PP-g-MAH prepared in the first comparative example improves the interfacial compatibility between the wheat flour and the PP substrate to a certain extent, but the section still has a more obvious phase separation state; therefore, the polypropylene grafted itaconic anhydride material can be applied to the composite PP material of the wheat flour, and the interface compatibility of the material can be greatly improved;
as shown in fig. 6, with the increase of the PP-g-ITA ratio of the added experimental example two, the impact strength of the obtained material is gradually improved, and when the addition amount of PP-g-ITA of the experimental example two is 4%, the impact strength of the obtained material is improved by 10.1% compared with the scheme without PP-g-ITA or PP-g-MAH; the impact strength of the PP-g-MAH prepared in the first comparative example is not obviously improved compared with that of a sample without the compatilizer; from this, it can be known that the ability of the polypropylene grafted itaconic anhydride material to promote the interfacial compatibility of the material is stronger than that of the polypropylene grafted maleic anhydride material, and the higher the proportion of the added polypropylene grafted itaconic anhydride material is, the greater the improvement of the impact strength of the material is.
Claims (10)
1. A high-grafting-rate polypropylene grafted itaconic anhydride material is characterized in that: comprises the following components in parts by weight:
100 parts of polypropylene resin;
0.2-1 part of peroxide initiator;
3-9 parts of itaconic anhydride;
0.1-0.3 parts of degradation inhibitor.
2. The high grafting ratio polypropylene grafted itaconic anhydride material of claim 1, wherein: the polypropylene resin comprises one or more of homo-polypropylene, random copolymer polypropylene and block copolymer polypropylene; the melt index of the polypropylene resin is 2-50 g/10min (230 ℃ C., 2.16 kg).
3. The high grafting ratio polypropylene grafted itaconic anhydride material of claim 1, wherein: the peroxide initiator comprises one or more of dicumyl peroxide, 1, 4-di-tert-butyl peroxyisopropyl benzene, di-tert-butyl peroxide and tert-butyl peroxyacetate.
4. The high grafting ratio polypropylene grafted itaconic anhydride material of claim 1, wherein: the itaconic anhydride is full bio-based itaconic anhydride, and is prepared by fermenting plants.
5. The high grafting ratio polypropylene grafted itaconic anhydride material of claim 1, wherein: the degradation inhibitor comprises one or two of styrene and alpha-methyl styrene.
6. A method for preparing a high-grafting-rate polypropylene grafted itaconic anhydride material by banburying and melt blending, which is a method for preparing a high-grafting-rate polypropylene grafted itaconic anhydride material according to any of claims 1 to 5, and is characterized in that: the polypropylene grafted itaconic anhydride material is prepared by a banburying and melt blending process, and comprises the following steps:
s1: weighing the following raw materials in parts by mass: uniformly mixing polypropylene resin, a peroxide initiator, itaconic anhydride and a degradation inhibitor;
s2: the evenly mixed raw materials are fed into an internal mixer through a feeding port for internal mixing and melting;
s3: granulating the material subjected to banburying and melt blending by a short single screw extruder;
s4: obtaining the polypropylene grafted itaconic anhydride material.
7. The method for preparing the high-grafting-rate polypropylene grafted itaconic anhydride material by banburying melt blending according to claim 6, which is characterized in that: the mixing equipment in the step S1 is selected from medium-low speed mixing, and one of three-dimensional blending equipment, vertical medium-low speed mixing equipment and horizontal medium-low speed mixing equipment is selected; the banburying parameters in the step S2 are 170-220 ℃ and 5-15 min, and the rotating speed of the rotor is 50-100 rpm; and the single screw extrusion granulation parameter in the step S3 is 160-200 ℃ and the rotating speed is 200-500 rpm.
8. A preparation method of a high-grafting-rate polypropylene grafted itaconic anhydride material by adopting twin-screw melt extrusion blending, which is a preparation method of a high-grafting-rate polypropylene grafted itaconic anhydride material according to any of claims 1 to 5, and is characterized in that: the polypropylene grafted itaconic anhydride material is prepared by a double-screw melt extrusion blending process, and comprises the following steps:
z1: weighing the raw materials according to the parts by weight, and uniformly mixing polypropylene resin, a peroxide initiator, itaconic anhydride and a degradation inhibitor;
z2: the evenly mixed raw materials are fed into a double-screw extruder through a feeding port, and are subjected to melt blending extrusion granulation through double screws;
z3: vibration screening and homogenization are carried out on the extruded and granulated material;
z4: obtaining the polypropylene grafted itaconic anhydride material.
9. The method for preparing the high-grafting-rate polypropylene grafted itaconic anhydride material by adopting twin-screw melt extrusion blending according to claim 8, which is characterized in that: the mixing equipment in the step Z1 is selected from medium-low speed mixing, and one of three-dimensional blending equipment, vertical medium-low speed mixing equipment and horizontal medium-low speed mixing equipment is selected; the technological parameters in the step Z2 are that the length-diameter ratio of the screw is 40-60, the extrusion temperature is 160-220 ℃, and the screw rotating speed is 200-400 rpm; the technological parameter of the step Z3 is homogenization time of 2-4 hours, and the discharging temperature is less than or equal to 40 ℃.
10. The application of the high-grafting-rate polypropylene grafted itaconic anhydride material is characterized in that: applying a high grafting ratio polypropylene grafted itaconic anhydride material according to any of claims 1 to 5 to a plant fiber/powder composite polyolefin material; the addition proportion of the polypropylene grafted itaconic anhydride material is 1% -4%; the proportion of the plant fiber/powder composite polyolefin material is 10% -40%.
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