CN116003907A - Polypropylene composite material and preparation method thereof - Google Patents

Polypropylene composite material and preparation method thereof Download PDF

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Publication number
CN116003907A
CN116003907A CN202211649943.8A CN202211649943A CN116003907A CN 116003907 A CN116003907 A CN 116003907A CN 202211649943 A CN202211649943 A CN 202211649943A CN 116003907 A CN116003907 A CN 116003907A
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polypropylene composite
polypropylene
modified carbon
sulfonamide
nano tube
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CN202211649943.8A
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Inventor
付伟
赖昂
陈瑶
陈胜杰
熊值
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Wuhan Kingfa Technology Enterprise Technology Center Co ltd
Wuhan Kingfa Sci and Tech Co Ltd
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Wuhan Kingfa Technology Enterprise Technology Center Co ltd
Wuhan Kingfa Sci and Tech Co Ltd
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Priority to CN202211649943.8A priority Critical patent/CN116003907A/en
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Abstract

The invention relates to a polypropylene composite material and a preparation method thereof. According to the invention, the electromagnetic shielding problem is solved by adding the transition metal modified carbon nano tube, the light hydrocarbon solvent can be captured by the modified carbon nano tube through the coordination of the sulfonamide compound and the transition metal modified carbon nano tube, the light hydrocarbon solvent can react with the sulfonamide compound on the surface of the modified carbon nano tube, and the sulfonamide compound is a compatilizer between the modified carbon nano tube and polypropylene, so that the performance of the modified carbon nano tube and the polypropylene is better, and the obtained polypropylene composite material meets the requirements of electromagnetic shielding, solvent resistance and high performance of a radar bracket.

Description

Polypropylene composite material and preparation method thereof
Technical Field
The invention belongs to the field of modified plastics, and particularly relates to a polypropylene composite material and a preparation method thereof.
Background
Along with the rising of intelligent driving control in the automobile field, the vehicle-mounted radar support and the housing are urgent to meet the shielding effect above 77GHz, the polypropylene composite material is required to meet the electromagnetic shielding requirement, the electromagnetic shielding effect of the polypropylene composite material is achieved, the conductivity of the polypropylene material is improved, and in order to improve the conductivity of the polypropylene material, many researches are carried out. The addition of conductive fillers to polypropylene is one of the main methods of improving the conductive properties of polypropylene materials at present.
The biggest problem faced by polypropylene composite materials at present is that the surface of the polypropylene composite materials is easily damaged due to poor solvent resistance, especially light hydrocarbon solvents, especially gasoline, diesel oil, kerosene and engine oil solvents. The invention patent CN108373565A realizes the barrier effect on the solvent by adding high-density polyethylene, but the high-density polyethylene cannot completely block the light hydrocarbon solvent; patent CN106243484a describes a solvent resistance achieved by adding macromolecular silane and fluoropolymer, but this approach is more dependent on the distribution of the fluoropolymer on the surface of the polypropylene composite, the more uniform the distribution, the better the solvent resistance, with uncertainty.
Disclosure of Invention
The invention aims to provide a polypropylene composite material and a preparation method thereof, and the composite material solves the problem of poor solvent resistance of electromagnetic shielding polypropylene.
The invention provides a polypropylene composite material which comprises the following components in parts by mass:
Figure BDA0004010002170000011
the polypropylene resin is at least one of homo-polypropylene and co-polypropylene.
The transition metal modified carbon nano tube is a magnetic metal modified carbon nano tube, and the content of the magnetic metal is 10-20%; the magnetic metal modified carbon nanotube comprises at least one of a nickel-coated carbon nanotube and a cobalt-coated carbon nanotube.
The sulfonamide compound is at least one of N-methyl sulfonamide, N-propyl sulfonamide, N-butylbenzene sulfonamide and N, N-dimethyl sulfonamide.
The toughening agent is an ethylene-octene copolymer, the melt flow index is tested to be 1-10g/10min (standard ISO 1133-1:2011) under the condition of 190 ℃/2.16kg, and the density is 0.91-0.93g/cm 3
The polypropylene composite material also comprises 0.5-1 part of processing aid; the processing aid is one or more of a lubricant and an antioxidant.
The lubricant is oleamide; the antioxidant is at least one of antioxidant SONOX 1010, antioxidant SONOX 168, antioxidant SONOX1076 and DLTDP.
Preferably, the transition metal modified carbon nano tube is 12-15 parts; 6-8 parts of sulfonamide compound.
The invention provides a preparation method of a polypropylene composite material, which comprises the following steps:
sequentially adding the components into a mixer according to the proportion for mixing; and (3) feeding the mixed materials into an extruder, and extruding and granulating after mixing, melting and homogenizing to obtain the solvent-resistant electromagnetic shielding-resistant high-performance polypropylene composite material.
The length-diameter ratio of the extruder screw is 36-48:1, and the extrusion temperature is 80-230 ℃.
The invention provides an application of a polypropylene composite material in a radar bracket.
The invention adopts the strong interaction between C-N between the transition metal modified carbon nano tube and the sulfonamide compound to ensure that the sulfonamide is tightly adsorbed on the carbon nano tube, and the sulfonamide is used as a compatilizer between the carbon nano tube and the polypropylene, so that the composite material has excellent mechanical property; in addition, the magnetic metal in the transition metal modified carbon nano tube enables charges in the polypropylene composite material system to form stable orientation, and a conductive path is formed, so that the electromagnetic shielding effect of the composite material is better; by utilizing the hollow characteristic of the carbon nano tube, the hydrocarbon solvent is sucked into the carbon nano tube by capillary action, particularly the hydrocarbon solvent with the carbon number of C4-C22 is sucked into the carbon nano tube, and the hydrocarbon solvent and the sulfonamide substance are subjected to alkylation reaction under the catalysis of magnetic metal to generate stable compounds, so that the polypropylene material shows excellent solvent resistance, the defect of solvent resistance failure in a blocking mode is overcome, and the obtained composite material is widely applied to automobile radar bracket parts.
Advantageous effects
According to the invention, the electromagnetic shielding problem is solved by adding the transition metal modified carbon nano tube, the hydrocarbon solvent can be captured by the modified carbon nano tube through the coordination of the sulfonamide and the transition metal modified carbon nano tube, the sulfonamide can react with the sulfonamide on the surface of the modified carbon nano tube, and the sulfonamide substance is a compatilizer between the modified carbon nano tube and polypropylene, so that the modified carbon nano tube and polypropylene have better performance, and the obtained polypropylene composite material meets the requirements of electromagnetic shielding, solvent resistance and high performance of a radar bracket.
Detailed Description
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Further, it is understood that various changes and modifications may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
The reagents, methods and apparatus employed in the present invention, unless otherwise specified, are all conventional in the art.
The following examples and comparative examples were prepared from the following raw materials:
polypropylene resin 1: homo polypropylene, brand: PP EP548R, manufacturer: middle sea shell;
polypropylene resin 2: copolymerized polypropylene, brand: PP SZ30S, manufacturer: performing China Korean petrifaction;
transition metal modified carbon nanotube 1: nickel-coated carbon nanotubes, nickel content 15%, brand C-Ni, manufacturer: firstly, enlarging nanometer; transition metal modified carbon nanotube 2: cobalt-coated carbon nanotubes, cobalt content of 15%, brand C-Co, manufacturer: firstly, enlarging nanometer; modified carbon nanotubes: copper-coated carbon nanotubes, copper content 15%, brand C-Cu, manufacturer: firstly, enlarging nanometer;
transition metal modified carbon nanotube 3: nickel-coated carbon nanotubes, nickel content 25%, brand C-Ni, manufacturer: firstly, enlarging nanometer; carbon nanotubes: are commercially available;
graphene: are commercially available;
sulfonamide compound 1: n-methyl methanesulfonamide, manufacturer: a national pharmaceutical chemistry reagent;
sulfonamide compound 2: n-propyl sulfonamide, manufacturer: a national pharmaceutical chemistry reagent;
toughening agent 1: ethylene-octene copolymer having a melt flow index of 1g/10min, a density of 0.91g/cm measured at 190℃C/2.16 kg 3 Brand POE 7467, manufacturer: ceramic.
Toughening agent 2: ethylene-octene copolymer having a melt flow index of 10g/10min and a density of 0.93g/cm measured at 190℃C/2.16 kg 3 Brand: POE 8137, vendor: ceramic.
Toughening agent 3: ethylene-octene copolymer having a melt flow index of 5g/10min and a density of 0.92g/cm measured at 190℃C/2.16 kg 3 Brand: POE 7447, manufacturer: ceramic.
An antioxidant: antioxidant SONOX 1010 and antioxidant SONOX 168 in a mass ratio of 1:1.
The composite materials of each example and comparative example were prepared by the following procedure:
sequentially adding the components into a mixer, and mixing for 3-5min to obtain a uniform mixing state; and (3) putting the uniformly mixed materials into an extruder from a main feed opening, wherein the length-diameter ratio of an extrusion screw is 36-48:1, extruding and granulating after mixing, melting and homogenizing, and setting the temperature of the extruder according to the temperature of the 1 region of 80-120 ℃, the temperature of the 2-5 region of 180-200 ℃ and the temperature of the other regions of 200-230 ℃ to obtain the composite material.
Examples and comparative examples were subjected to the following test methods or test criteria:
(1) The physical property test methods of the materials are all in accordance with ISO standard, the test conditions are 23 ℃ and the stretching speed is 50mm/min; bending ISO 178:2019, test conditions 23 ℃, bending rate 2mm/min.
(2) The electromagnetic shielding property of the material is characterized by adopting a test volume resistivity, and the material is tested by adopting a ZC46A high resistance meter manufactured by Shanghai precision scientific instruments Co., ltd and an electrode of ZC 36.
(3) Solvent resistance test: the material is injection molded into a color plate, the color plate is wiped by hydrocarbon solvents (gasoline, kerosene and diesel oil) at the temperature of 23 ℃, the color plate is placed in a room temperature environment for 24 hours, and after the residual solvents on the surface are cleaned, the surface change is visually compared.
Table 1 the proportions (in parts by mass) of the components of the examples and comparative examples
Figure BDA0004010002170000041
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Figure BDA0004010002170000051
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Figure BDA0004010002170000061
Table 2 test results for examples and comparative examples
Figure BDA0004010002170000062
From the above experimental results, it can be seen thatThe composites of examples 1-11 thus far have excellent electromagnetic shielding, solvent resistance, high performance and volume resistivity of 10 2- 10 5 The flexural modulus can reach 4900-8900MPa.
Comparative examples 1 and 2 were inferior in performance to example 1 in that no transition metal-modified carbon nanotube or no sulfonamide compound was added, and did not have the solvent-resistant effect.
Compared with the embodiment 1, when the non-transition metal modified carbon nano tube or the original carbon nano tube or the graphene in the prior art is added in the comparative examples 3, 4 and 5, the performance is obviously inferior to that of the transition metal modified carbon nano tube when the addition amount is the same, and the electromagnetic shielding effect is not achieved; if the electromagnetic shielding effect and the high performance requirement are required to be met, a large amount of traditional carbon nanotubes or graphene in the prior art are required to be added.
When the transition metal-modified carbon nanotubes of comparative examples 6 and 7 were too much or too little as compared with example 1, the addition was excessive, the performance was excessive, the cost was extremely high, and the addition was too little to achieve the intended effect of the present invention.
Comparative example 8 the excess sulfonamide compound compared to example 1 resulted in a decrease in the mechanical properties of the composite.

Claims (10)

1. A polypropylene composite material characterized by: the coating comprises the following components in parts by weight:
Figure FDA0004010002160000011
2. the polypropylene composite according to claim 1, wherein: the polypropylene resin is at least one of homo-polypropylene and co-polypropylene.
3. The polypropylene composite according to claim 1, wherein: the transition metal modified carbon nano tube is a magnetic metal modified carbon nano tube, and the content of the magnetic metal is 10-20%; the magnetic metal modified carbon nanotube comprises at least one of a nickel-coated carbon nanotube and a cobalt-coated carbon nanotube.
4. The polypropylene composite according to claim 1, wherein: the sulfonamide compound is at least one of N-methyl sulfonamide, N-propyl sulfonamide, N-butylbenzene sulfonamide and N, N-dimethyl sulfonamide.
5. The polypropylene composite according to claim 1, wherein: the toughening agent is an ethylene-octene copolymer, the melt flow index is tested to be 1-10g/10min under the condition of 190 ℃/2.16kg, and the density is 0.91-0.93g/cm 3
6. The polypropylene composite according to claim 1, wherein: the polypropylene composite material also comprises 0.5-1 part of processing aid; the processing aid is one or more of a lubricant and an antioxidant.
7. The polypropylene composite according to claim 6, wherein: the lubricant is oleamide; the antioxidant is at least one of antioxidant SONOX 1010, antioxidant SONOX 168, antioxidant SONOX1076 and DLTDP.
8. The polypropylene composite according to claim 1, wherein: 12-15 parts of transition metal modified carbon nanotubes; 6-8 parts of sulfonamide compound.
9. A process for the preparation of a polypropylene composite as claimed in any one of claims 1 to 8, comprising the steps of:
the components are sequentially put into a mixer according to the proportion for mixing; and (3) feeding the mixed materials into an extruder, and extruding and granulating after mixing, melting and homogenizing to obtain the solvent-resistant electromagnetic shielding-resistant high-performance polypropylene composite material.
10. Use of a polypropylene composite according to any one of claims 1-8 in a radar stand.
CN202211649943.8A 2022-12-21 2022-12-21 Polypropylene composite material and preparation method thereof Pending CN116003907A (en)

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CN108047569A (en) * 2018-01-15 2018-05-18 北京工商大学 A kind of functional composite material and preparation method thereof
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CN109627585A (en) * 2018-12-19 2019-04-16 深圳烯湾科技有限公司 The fibre-reinforced PP type composite material and preparation method of modified carbon nano-tube
CN112708194A (en) * 2020-12-14 2021-04-27 上海金发科技发展有限公司 Low-gloss and low-odor polypropylene composite material and preparation method thereof
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CN114957855A (en) * 2022-06-10 2022-08-30 南京航空航天大学 Wave-absorbing heat-conducting thermoplastic composite material and preparation method thereof
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06228436A (en) * 1993-02-05 1994-08-16 Mitsui Petrochem Ind Ltd Thermoplastic resin composition
KR20040078002A (en) * 2003-03-03 2004-09-08 (주) 나노텍 Carbon Nano-Composite Materials for Shielding of Electromagnetic Wave and Preparation Method Thereof
US20110251331A1 (en) * 2007-06-27 2011-10-13 Mcandrew Thomas Page Use of nanotubes, especially carbon nanotubes, to improve the high temperature mechanical properties of a polymeric matrix
CN101987917A (en) * 2009-07-30 2011-03-23 现代自动车株式会社 Conductive polyamide composite composition and fuel transport tube using the same
CN102443213A (en) * 2011-09-22 2012-05-09 中国科学院长春应用化学研究所 Oriented carbon nanotube / polyolefin composite material and preparation method thereof
KR20140107119A (en) * 2013-02-27 2014-09-04 제일모직주식회사 Thermoplastic Resin Composition Having Excellent EMI Shielding Property
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JP2017186440A (en) * 2016-04-05 2017-10-12 東洋インキScホールディングス株式会社 Conductive resin composition and production method of molded article
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CN108047569A (en) * 2018-01-15 2018-05-18 北京工商大学 A kind of functional composite material and preparation method thereof
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