CN117511024A - Polyethylene composite material and preparation method thereof - Google Patents
Polyethylene composite material and preparation method thereof Download PDFInfo
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- -1 Polyethylene Polymers 0.000 title claims abstract description 45
- 239000002131 composite material Substances 0.000 title claims abstract description 45
- 239000004698 Polyethylene Substances 0.000 title claims abstract description 41
- 229920000573 polyethylene Polymers 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003365 glass fiber Substances 0.000 claims abstract description 22
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000004114 Ammonium polyphosphate Substances 0.000 claims abstract description 16
- 235000019826 ammonium polyphosphate Nutrition 0.000 claims abstract description 16
- 229920001276 ammonium polyphosphate Polymers 0.000 claims abstract description 16
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 16
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 16
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 16
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 16
- 239000006057 Non-nutritive feed additive Substances 0.000 claims abstract description 15
- 229920001912 maleic anhydride grafted polyethylene Polymers 0.000 claims abstract description 14
- 238000001125 extrusion Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 17
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 239000008187 granular material Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 9
- 229910021389 graphene Inorganic materials 0.000 claims description 8
- 239000000314 lubricant Substances 0.000 claims description 7
- 239000003963 antioxidant agent Substances 0.000 claims description 4
- 230000003078 antioxidant effect Effects 0.000 claims description 4
- 239000000155 melt Substances 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 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 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 2
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 2
- JKBYAWVSVVSRIX-UHFFFAOYSA-N octadecyl 2-(1-octadecoxy-1-oxopropan-2-yl)sulfanylpropanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)SC(C)C(=O)OCCCCCCCCCCCCCCCCCC JKBYAWVSVVSRIX-UHFFFAOYSA-N 0.000 claims description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 2
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims 1
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 abstract description 7
- 239000003063 flame retardant Substances 0.000 abstract description 7
- 239000011256 inorganic filler Substances 0.000 abstract description 3
- 229910003475 inorganic filler Inorganic materials 0.000 abstract description 3
- 230000002708 enhancing effect Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000012546 transfer Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- ODJQKYXPKWQWNK-UHFFFAOYSA-N 3,3'-Thiobispropanoic acid Chemical compound OC(=O)CCSCCC(O)=O ODJQKYXPKWQWNK-UHFFFAOYSA-N 0.000 description 1
- SHKQKKOHPFTVTN-UHFFFAOYSA-N C1(C=C/C(=O)O1)=O.CS(=O)C Chemical compound C1(C=C/C(=O)O1)=O.CS(=O)C SHKQKKOHPFTVTN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000003490 Thiodipropionic acid Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- PWWSSIYVTQUJQQ-UHFFFAOYSA-N distearyl thiodipropionate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCCCCCCCC PWWSSIYVTQUJQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 235000019303 thiodipropionic acid Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000004711 α-olefin Substances 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
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a polyethylene composite material and a preparation method thereof, wherein the polyethylene composite material is prepared from 48-78 parts of composite polyethylene, 10-20 parts of glass fiber, 5-10 parts of modified graphene oxide, 7-17 parts of ammonium polyphosphate, 0.5 part of dispersing agent and 0.8 part of processing aid according to parts by weight; wherein the composite polyethylene is compounded by 35-50 parts of high-density polyethylene, 10-25 parts of linear low-density polyethylene and 3 parts of maleic anhydride grafted polyethylene according to parts by weight. According to the polyethylene composite material provided by the invention, the inorganic fillers (rod-shaped glass fibers and flaky modified graphene oxide) with various shapes are used for enhancing the framework, so that the strength of the composite material is improved, and an excellent heat conduction channel is further provided; meanwhile, the layered modified graphene oxide and ammonium polyphosphate compounded flame-retardant system also provides excellent flame-retardant performance for the composite material.
Description
Technical Field
The invention relates to the technical field of modification of high polymer materials, in particular to a polyethylene composite material and a preparation method thereof.
Background
Polyethylene is a thermoplastic resin produced by polymerizing ethylene. Industrially, copolymers of ethylene with small amounts of alpha-olefins are also included. Polyethylene is odorless, nontoxic, wax-like in hand feeling, excellent in low temperature resistance (the lowest use temperature can reach-100 to-70 ℃), good in chemical stability, and resistant to most of acid and alkali attack (not resistant to acid with oxidation property). Is insoluble in common solvents at normal temperature, has small water absorption and excellent electrical insulation. As the material with the largest productivity and the most extensive application range in the current synthetic resin, the polyethylene material is almost applied to various aspects of social production and life.
The process of transferring heat between two objects in contact with each other and at different temperatures, or between different temperature portions of the same object, without relative macroscopic displacement is known as thermal conduction. Heat transfer both inside the dense solid and in the stationary fluid is purely thermally conductive. From a microscopic point of view, thermal conduction relies on the thermal motion of the particles that make up the substance to transfer heat. Higher energy is available at higher temperatures. These particles interact (bump, diffuse, etc.) with the lower energy particles of the low temperature portion to form thermal conductivity. The heat conduction of nonmetallic materials mainly depends on the mode that elastic waves are generated by the vibration of a lattice structure to transfer energy. It is referred to in physics as phonon transfer energy. During the transfer process, if factors of phonon scattering exist, such as crystal gaps and cracks, the thermal conductivity can be significantly reduced.
Disclosure of Invention
In view of the above, the present invention provides a polyethylene composite material and a preparation method thereof, so as to solve the problems set forth in the background art, and by using an inorganic filler reinforced structure with various shapes, the strength of the composite material is improved, and an excellent heat conduction channel is provided; meanwhile, the layered modified graphene oxide and ammonium polyphosphate compounded flame-retardant system also provides excellent flame-retardant performance for the composite material.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the invention discloses a polyethylene composite material which is prepared from 48-78 parts of composite polyethylene, 10-20 parts of glass fiber, 5-10 parts of modified graphene oxide, 7-17 parts of ammonium polyphosphate, 0.5 part of dispersing agent and 0.8 part of processing aid in parts by weight; wherein the composite polyethylene is compounded by 35-50 parts of high-density polyethylene, 10-25 parts of linear low-density polyethylene and 3 parts of maleic anhydride grafted polyethylene according to parts by weight. The high-density polyethylene increases the strength and the heat resistance, the linear low-density polyethylene improves the processability, and the maleic anhydride grafted polyethylene improves the interfacial binding force between the polyethylene and the filler.
As a further scheme of the invention: the tensile elongation at break of the high-density polyethylene is not less than 600 percent, and the melt mass flow rate is not more than 2g/10min under the conditions of 190 ℃ and 2.16 kg.
As a further scheme of the invention: the linear low density polyethylene has a melt mass flow rate of no more than 2g/10min at 190 ℃ under 2.16kg conditions.
As a further scheme of the invention: the glass fiber is a chopped glass fiber.
As a further scheme of the invention: the modified graphene oxide is modified to improve the compatibility of graphene and a resin substrate and reduce the agglomeration of graphene. The specific preparation method comprises the following steps:
adding 1 part by weight of graphene oxide into 200 parts by weight of dimethyl sulfoxide, and carrying out ultrasonic oscillation for 30min to uniformly mix to obtain a mixture;
and heating the mixture to 70 ℃, dropwise adding 20 parts by weight of a dimethyl sulfoxide solution of maleic anhydride into the mixture, continuously stirring for reaction for 2 hours after the dropwise addition, centrifuging, washing the precipitate with absolute ethyl alcohol, and drying to obtain the modified graphene oxide.
As a further scheme of the invention: the dispersing agent is a hard ester amide dispersing agent.
As a further scheme of the invention: the processing aid includes an antioxidant and a lubricant.
As a further scheme of the invention: the antioxidant is at least one of pentaerythritol tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], n-stearyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, tri- (2, 4-di-tert-butylphenyl) phosphite and dioctadecyl thiodipropionate.
As a further scheme of the invention: the lubricant is an EBS lubricant.
The invention also discloses a preparation method of the polyethylene composite material according to any one of the above steps, which comprises the following steps:
weighing high-density polyethylene, linear low-density polyethylene, maleic anhydride grafted polyethylene, glass fiber, modified graphene oxide, ammonium polyphosphate, a dispersing agent and a processing aid according to parts by weight, and adding the materials into a high-speed mixer to mix for 5-15min to obtain a uniformly mixed material;
adding the mixed material into a double-screw extruder, and obtaining polyethylene composite material granules after mixing, extruding, cooling and granulating;
wherein the extrusion temperature of each extrusion zone in the twin-screw extruder is 145-155 ℃, 150-160 ℃, 160-170 ℃, 170-180 ℃, 180-190 ℃ respectively.
Compared with the prior art, the invention has the beneficial effects that:
according to the polyethylene composite material provided by the invention, the inorganic fillers (rod-shaped glass fibers and flaky modified graphene oxide) with various shapes are used for enhancing the framework, so that the strength of the composite material is improved, and an excellent heat conduction channel is further provided; meanwhile, the layered modified graphene oxide and ammonium polyphosphate compounded flame-retardant system also provides excellent flame-retardant performance for the composite material.
Detailed Description
In order that the invention may be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated below. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Specific information of the raw materials used in the following examples and comparative examples are as follows:
the high density polyethylene is available from Shanghai Seisaceae under the brand name HDPE-5502 FA;
the linear low density polyethylene is available from Exxon Mobil under the brand name mLLDPE-1018 MA;
the maleic anhydride grafted polyethylene was available from Exxon Mobil under the trademark PE 1040;
the glass fiber is chopped glass fiber with the trade mark of 248A and is purchased from Eurasian Kening;
ammonium polyphosphate, available from the chemical industry of Chuan phosphorus, changzhou;
the dispersing agent is commercially available hard ester amide dispersing agent;
the processing aid is compounded by beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propanoic acid n-octadecyl ester (1076), tri- (2, 4-di-tert-butylphenyl) phosphite ester (168), thiodipropionic acid dioctadecyl ester (DSTDP) and lubricant EBS according to the weight ratio of 1:1:1:1;
the modified graphene oxide is a self-made product, and the preparation method is as follows:
adding 1 part by weight of graphene oxide into 200 parts by weight of dimethyl sulfoxide, carrying out ultrasonic oscillation for 30min, uniformly mixing, heating the mixture to 70 ℃, dropwise adding 20 parts of maleic anhydride dimethyl sulfoxide solution, continuously stirring for reaction for 2h after the dropwise addition, centrifuging, washing the precipitate with absolute ethyl alcohol, and drying to obtain the modified graphene oxide.
Wherein, the graphene oxide is purchased from Nanjing Xianfeng nanotechnology, and the dimethyl sulfoxide is purchased from Alatine.
It will be appreciated that the above raw material reagents are only examples of some embodiments of the invention, so that the technical solution of the invention is more clear, and it is not represented that the invention can only employ the above reagents, and the scope of the claims is in particular. In addition, "parts" described in examples and comparative examples refer to parts by weight unless otherwise specified.
Any range recited in the invention includes any numerical value between the endpoints and any sub-range of any numerical value between the endpoints or any numerical value between the endpoints.
Example 1
Weighing 50 parts of high-density polyethylene, 10 parts of linear low-density polyethylene, 3 parts of maleic anhydride grafted polyethylene, 10 parts of glass fiber, 10 parts of modified graphene oxide, 17 parts of ammonium polyphosphate, 0.5 part of dispersing agent and 0.8 part of processing aid, and adding into a high-speed mixer to mix for 5min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain polyethylene composite material granules; wherein the extrusion temperature of each extrusion zone in the twin-screw extruder is 155 ℃, 160 ℃, 170 ℃, 180 ℃ and 190 ℃, respectively. The product properties are shown in Table 1.
Example 2
Weighing 40 parts of high-density polyethylene, 20 parts of linear low-density polyethylene, 3 parts of maleic anhydride grafted polyethylene, 15 parts of glass fiber, 10 parts of modified graphene oxide, 12 parts of ammonium polyphosphate, 0.5 part of dispersing agent and 0.8 part of processing aid, and adding into a high-speed mixer to mix for 10 minutes; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain polyethylene composite material granules; wherein the extrusion temperature of each extrusion zone in the twin-screw extruder was 155 ℃, 160 ℃, 170 ℃, 175 ℃, 185 ℃, respectively. The product properties are shown in Table 1.
Example 3
Weighing 35 parts of high-density polyethylene, 25 parts of linear low-density polyethylene, 3 parts of maleic anhydride grafted polyethylene, 20 parts of glass fiber, 5 parts of modified graphene oxide, 7 parts of ammonium polyphosphate, 0.5 part of dispersing agent and 0.8 part of processing aid, and adding into a high-speed mixer to mix for 5-15min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain polyethylene composite material granules; wherein the extrusion temperature of each extrusion zone in the twin-screw extruder is 145 ℃, 150 ℃, 160 ℃, 170 ℃, 180 ℃ respectively. The product properties are shown in Table 1.
TABLE 1
| Test item/unit | Test standard | Example 1 | Example 2 | Example 3 |
| Tensile Strength/MPa | ISO 527 | 46.8 | 50.3 | 58.7 |
| Heat distortion temperature/°c | ISO 75 | 102 | 114 | 126 |
| Thermal conductivity/W/mK | ISO 22007-2 | 337 | 361 | 307 |
| Vertical combustion performance/V | UL 94 | V-0 | V-0 | V-1 |
Note that: the test samples in Table 1 were molded at a temperature of 175 to 185℃under the following conditions and dimensions:
tensile strength test: 1A sample bar, stretching speed is 5mm/min;
heat distortion temperature: the load is 0.45MPa;
thermal conductivity testing: sample thickness 15mm, test time 160s
Vertical combustion performance: the sample thickness was 3.2mm.
Comparative example 1
Weighing 40 parts of high-density polyethylene, 20 parts of linear low-density polyethylene, 3 parts of maleic anhydride grafted polyethylene, 25 parts of glass fiber, 12 parts of ammonium polyphosphate, 0.5 part of dispersing agent and 0.8 part of processing aid, and adding into a high-speed mixer to mix for 10min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain polyethylene composite material granules; wherein the extrusion temperature of each extrusion zone in the twin-screw extruder was 155 ℃, 160 ℃, 170 ℃, 175 ℃, 185 ℃, respectively. The product properties are shown in Table 2.
Comparative example 2
Weighing 40 parts of high-density polyethylene, 20 parts of linear low-density polyethylene, 3 parts of maleic anhydride grafted polyethylene, 15 parts of glass fiber, 22 parts of modified graphene oxide, 0.5 part of dispersing agent and 0.8 part of processing aid, and adding into a high-speed mixer to mix for 10min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain polyethylene composite material granules; wherein the extrusion temperature of each extrusion zone in the twin-screw extruder was 155 ℃, 160 ℃, 170 ℃, 175 ℃, 185 ℃, respectively. The product properties are shown in Table 2.
Comparative example 3
Weighing 40 parts of high-density polyethylene, 20 parts of linear low-density polyethylene, 3 parts of maleic anhydride grafted polyethylene, 25 parts of modified graphene oxide, 12 parts of ammonium polyphosphate, 0.5 part of dispersing agent and 0.8 part of processing aid, and adding into a high-speed mixer to mix for 10min; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain polyethylene composite material granules; wherein the extrusion temperature of each extrusion zone in the twin-screw extruder was 155 ℃, 160 ℃, 170 ℃, 175 ℃, 185 ℃, respectively. The product properties are shown in Table 2.
Comparative example 4
Weighing 40 parts of high-density polyethylene, 20 parts of linear low-density polyethylene, 3 parts of maleic anhydride grafted polyethylene, 15 parts of glass fiber, 10 parts of unmodified graphene oxide, 12 parts of ammonium polyphosphate, 0.5 part of dispersing agent and 0.8 part of processing aid, and adding into a high-speed mixer to mix for 10 minutes; then adding the uniformly mixed materials into a double-screw extruder, mixing, extruding, cooling and granulating to obtain polyethylene composite material granules; wherein the extrusion temperature of each extrusion zone in the twin-screw extruder was 155 ℃, 160 ℃, 170 ℃, 175 ℃, 185 ℃, respectively. The product properties are shown in Table 2.
TABLE 2
Note that: the test samples in Table 2 were molded at 175-185℃in a molding press under the same test conditions and the same dimensions as those in Table 1.
From the examples and comparative examples, the thermal conductivity of the polyethylene composite material is comprehensively influenced by the content of glass fibers and the content of modified graphene oxide, and the flame retardant property of the composite material is mainly influenced by the modified graphene oxide and ammonium polyphosphate and is slightly influenced by the content of glass fibers; meanwhile, the glass fiber content has great influence on the mechanical property and heat resistance of the composite material, and the modification of the graphene oxide directly influences the dispersibility of the graphene oxide in the composite material and influences the overall performance of the material.
Although the present disclosure describes embodiments, not every embodiment is described in terms of a single embodiment, and such description is for clarity only, and one skilled in the art will recognize that the embodiments described in the disclosure as a whole may be combined appropriately to form other embodiments that will be apparent to those skilled in the art.
Therefore, the above description is only of the preferred embodiments of the present application and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. The polyethylene composite material is characterized by being prepared from 48-78 parts of composite polyethylene, 10-20 parts of glass fiber, 5-10 parts of modified graphene oxide, 7-17 parts of ammonium polyphosphate, 0.5 part of dispersing agent and 0.8 part of processing aid according to parts by weight; wherein the composite polyethylene is compounded by 35-50 parts of high-density polyethylene, 10-25 parts of linear low-density polyethylene and 3 parts of maleic anhydride grafted polyethylene according to parts by weight.
2. A polyethylene composite according to claim 1, wherein the high density polyethylene has a tensile elongation at break of not less than 600% and a melt mass flow rate of not more than 2g/10min at 190 ℃ and 2.16 kg.
3. A polyethylene composite material according to claim 1, wherein the linear low density polyethylene has a melt mass flow rate of not more than 2g/10min at 190 ℃ and 2.16 kg.
4. The polyethylene composite material according to claim 1, wherein the glass fibers are chopped glass fibers.
5. The polyethylene composite material according to claim 1, wherein the preparation method of the modified graphene oxide comprises the following steps:
adding 1 part by weight of graphene oxide into 200 parts by weight of dimethyl sulfoxide, and carrying out ultrasonic oscillation for 30min to uniformly mix to obtain a mixture;
and heating the mixture to 70 ℃, dropwise adding 20 parts by weight of a dimethyl sulfoxide solution of maleic anhydride into the mixture, continuously stirring for reaction for 2 hours after the dropwise addition, centrifuging, washing the precipitate with absolute ethyl alcohol, and drying to obtain the modified graphene oxide.
6. A polyethylene composite material according to claim 1, wherein the dispersant is a hard ester amide type dispersant.
7. A polyethylene composite material according to claim 1, wherein the processing aid comprises an antioxidant and a lubricant.
8. The polyethylene composite material according to claim 7, wherein the antioxidant is at least one of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], n-stearyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, tris- (2, 4-di-tert-butylphenyl) phosphite and dioctadecyl thiodipropionate.
9. The polyethylene composite material according to claim 7, wherein the lubricant is an EBS lubricant.
10. A method of preparing a polyethylene composite material according to any one of claims 1 to 9, comprising the steps of:
weighing high-density polyethylene, linear low-density polyethylene, maleic anhydride grafted polyethylene, glass fiber, modified graphene oxide, ammonium polyphosphate, a dispersing agent and a processing aid according to parts by weight, and adding the materials into a high-speed mixer to mix for 5-15min to obtain a uniformly mixed material;
adding the mixed material into a double-screw extruder, and obtaining polyethylene composite material granules after mixing, extruding, cooling and granulating;
wherein the extrusion temperature of each extrusion zone in the twin-screw extruder is 145-155 ℃, 150-160 ℃, 160-170 ℃, 170-180 ℃, 180-190 ℃ respectively.
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