CN104479205B - A kind of injection molding forming method of graphene modified poly ethylene high-strength composite thin products - Google Patents
A kind of injection molding forming method of graphene modified poly ethylene high-strength composite thin products Download PDFInfo
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- 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
- C08K3/02—Elements
- C08K3/04—Carbon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/78—Measuring, controlling or regulating of temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
- B29C2945/76—Measuring, controlling or regulating
- B29C2945/76003—Measured parameter
- B29C2945/7604—Temperature
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
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- 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
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- 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
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- 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
- C08L2207/066—LDPE (radical process)
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- Injection Moulding Of Plastics Or The Like (AREA)
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Abstract
The present invention relates to polymeric material field, more particularly to a kind of injection molding forming method of graphene modified poly ethylene high-strength composite thin products, first, the mode that polyethylene and graphene are respectively adopted to metered charge is added in double screw extruder, and is uniformly mixed and is blended in an extruder；Then the blend extruding pelletization being blended is obtained into graphene modified poly ethylene blended particles；It is then added to injection molding in injection molding machine and obtains graphene modified poly ethylene high-strength composite thin products；Wherein：The mould of injection molding machine is flat, mold height is 1 100mm, die length is 100 5000mm, width is 100 5000mm, die length or width and the ratio of height 20 500, the temperature that material passes through nozzle is 160 260 DEG C, injection pressure is 50 300MPa, mold temperature is 30 80 DEG C, and the cooling velocity of material in a mold is 2 40 DEG C/min.The higher graphene modified poly ethylene high-strength composite thin products of intensity can be prepared in the preparation method of the present invention.
Description
Technical field
The present invention relates to polymeric material field, and in particular to a kind of slim system of graphene modified poly ethylene high-strength composite
The injection molding forming method of product.
Background technology
Polyethylene is one of five big general-purpose plastics, has nontoxic inexpensive, light, excellent moisture-proof, good chemistry surely
, there are very extensive purposes, quilt in the features such as qualitative and easily molded processing in fields such as injection plate, sheet layer material, film articles
It is widely used in the fields such as food, automobile, chemical industry.But polyethylene thin products are particularly impacted since mechanical strength is not high enough
Insufficient strength, seriously limits it in larger range of application.
Graphene only has an atomic size thickness as a kind of new two-dimentional carbon nanomaterial, individual layer.Theoretical research table
Bright, graphene has excellent mechanical property, is current most strong material known in the world, its ultimate strength reaches 130
Gpa, Young's modulus are up to 1 TPa, and the theoretical specific surface area of graphene is up to 2630 m2/g.In addition graphene is a kind of ultralight
Material, the surface density of the graphene gone out by theoretical calculation is 0.77 mg/m2.These unique properties make it that graphene can be with
As a kind of new nanometer reinforcer, polyethylene is improved by preparing the polyethylene composite nano materials of graphene modification
The mechanical property of thin products.
The mechanical property of existing polyethylene thin products is not high, and particularly high density polyethylene (HDPE) product impact strength is low.
In polymer processing, the presence of shearing field or stretching field can produce important shadow to the molecular chain orientation of polymer and crystallization
Ring, so as to influence the macro-mechanical property of material.The material such as melted in injection molding process is quick in slim mould
Polymer molecular chain can be caused to produce during flowing height-oriented.But since there are polymer molecule in the cooling procedure of product
The relaxation of chain, can cause height-oriented polymer molecular chain disorientation so as to obtain isotropic polymer product.
And if the nanometer or micron filler of addition stratiform prepare polymer nanocomposites, anisotropic stratified nano materials exist
Orientation can be produced under field of flow, and the nano material being orientated can suppress the disorientation of polymer molecular chain due to space restriction effect
Movement, the orientation texture produced in process is stored in polymer product.If the poly- second that will be produced in process
Alkene molecular chain orientation combines with its crystallization of growing nonparasitically upon another plant in graphene surface, with regard to that can make between graphene and polyethylene by non-
Covalently bound mode strengthens the interface binding force between base polyethylene and graphene, this can effectively improve graphene with gathering
Load transfer efficiency between ethene matrix, so as to reach the effect of enhancing base polyethylene macromechanical property.
The content of the invention
The purpose of the present invention is to solve existing polyethylene thin products mechanical property it is insufficient the problem of, there is provided it is a kind of
The injection molding forming method of graphene modified poly ethylene high-strength composite thin products.
In order to reach foregoing invention purpose, the present invention uses following technical scheme：
A kind of injection molding forming method of graphene modified poly ethylene high-strength composite thin products, specifically includes following step
Suddenly：
（1）First, the mode that polyethylene and graphene are respectively adopted to metered charge is added in double screw extruder, and
It is uniformly mixed and is blended in an extruder；Then the blend extruding pelletization being blended is obtained into graphene modified poly ethylene
Blended particles；
（2）By step（1）Obtained graphene modified poly ethylene blended particles are added to injection molding in injection molding machine and obtain
Graphene modified poly ethylene high-strength composite thin products；Wherein：
The mould of injection molding machine is flat, and mold height 1-100mm, die length 100-5000mm, width are
The ratio 20-500 of 100-5000mm, die length or width and height, the temperature that material passes through nozzle is 160-260 DEG C, note
Injection pressure is 50-300MPa, and mold temperature is 30-80 DEG C, and the cooling velocity of material in a mold is 2-40 DEG C/min.
Preferably, the polyethylene is high density polyethylene (HDPE), low density polyethylene (LDPE) or linear low density polyethylene.
Preferably, the graphene is graphene with single or multiple lift structure, it is its a diameter of 0.5-20 μm, thick
Spend for 0.5-10nm, specific surface area 20-800m2/g。
Preferably, step（1）In 0.1-50 grams of graphene is added in every kilogram of polyethylene.
Preferably, step（1）Mixed process in, the processing temperature be 150-250 DEG C.
Preferably, step（1）Mixed process in, the process time be 0.5-10 minutes.
Preferably, the die length or width and the ratio 50-150 of height.
Preferably, the cooling velocity of material in a mold is 2-20 DEG C/min.
Preferably, the cooling velocity of material in a mold is 5-10 DEG C/min.
The mechanical property of the polymer nanocomposites not only Effect on Mechanical Properties by nano material in itself, also with nanometer
Interface interaction between material and polymeric matrix is closely related.And usually graphene etc. between reinforcer and polymeric matrix without bright
Aobvious interface interaction, can greatly weaken its humidification to polymeric matrix, it is therefore desirable to improve boundary by certain method
Face acts on.The method for improving the interfacial interaction between polymer and graphene at present is graphene surface chemical graft process.But
It is that graphene is because surface inertness makes its surface chemical modification difficult, and the method that chemical grafting treated is modified can destroy graphite
The sp2 hybrid structures of alkene surface carbon atom, the destruction of surface conjugated structure can greatly reduce the mechanical strength of graphene in itself,
Therefore humidification of the graphene to polymer composites is seriously reduced.
And the boundary between graphene and polymer is improved by the noncovalent interaction between graphene and polymeric matrix
Face interaction can improve its enhancing effect on the basis of graphene self structure is not destroyed.For crystalline polymer nanometer
It is existing between nano material and polymeric matrix since nano material has very high specific surface area for composite system
Interaction can directly affect（Interfacial crystallization）Or influence indirectly（Matrix crystallizes）The crystal property of polymeric matrix itself.Have
The graphene of high-specific surface area can be used as nucleator induction polyethylene crystallization, and due to graphene periodic structure in itself
Match with the cell parameter of polyethylene, graphene can induce polyethylene to grow nonparasitically upon another plant on its surface and crystallize formation mainly extended chain
Crystal structure, such interfacial crystallization layer can effectively improve the interface binding power between base polyethylene and graphene so that
Improve the transmission of load between base polyethylene and graphene.Therefore promoted using the nucleating effect and crystallization of growing nonparasitically upon another plant of graphene
Make base polyethylene crystallize to form extended chain crystallizing layer in graphene surface, graphene and base polyethylene can be significantly improved
Interfacial interaction.
The present invention high-strength polyethylene/graphene composite thin-type product, high intensity refer to tensile stress be more than 20MPa,
Stretch modulus is more than 800Mpa, impact strength is more than 50KJ/m2Product.
Polyethylene used in the present invention is included in high density polyethylene (HDPE), low density polyethylene (LDPE) and linear low density polyethylene
One or more, preferably high density polyethylene (HDPE), high density polyethylene (HDPE) side chain are few, it is easier to grow nonparasitically upon another plant crystallization, make in graphene surface
Interface binding power between polyethylene and graphene is stronger, therefore preferably.
Graphene used in the present invention is usually graphene with single or multiple lift structure, its a diameter of 0.5-20 μm,
Thickness is 0.5-10nm, specific surface area 20m2/g-800m2/ g, preferred single layer graphene, single-layer graphene specific surface area bigger,
The mechanical property enhancing of product becomes apparent from, therefore preferably.
Heretofore described high strength graphite alkene modified poly ethylene composite material, its content are to add in every kilogram of polyethylene
Enter 0.1-50 grams of graphene, be preferably 0.5-30 grams, be more preferably 1-20 grams, when graphene content is too low, the enhancing played
Effect is limited, and during graphene too high levels, graphene is easily assembled, composite processing technological requirement higher, thus preferably on
State scope.
High strength graphite alkene modified poly ethylene composite material can also add appropriate auxiliary agent in the present invention, and used is other
Auxiliary agent is not particularly limited, and can be enumerated as antioxidant, heat stabilizer, antiseptic, fire retardant, colouring agent, antistatic additive, lubrication
Agent, slip agent, stable radiation agent etc.；The content of heretofore described auxiliary agent helps to add 0.1-10 grams in every kilogram of polyethylene
Agent, preferably 0.5-5 grams, within this range, auxiliary agent can play the role of mechanical property that is due, and not interfering with product, because
This is preferred.
Metered charge is respectively adopted in polyethylene and graphene mixed process in the present invention, and the mode of metered charge has no especially
Limit, including the mode of mixing is added after the mode of volume metering and the mode of mass metrology or human metering；This
Extruder in invention used in mixed process is double screw extruder, can be enumerated as parallel counter rotation twin screw extruder, parallel
Parallel dual-screw extruding machine, conical double screw extruder etc., preferably parallel equidirectional two-screw extruder, parallel equidirectional two-screw squeeze
Go out machine good mixing effect, without rolling effect caused by separating force, therefore preferably；The time of mixed process is 0.5- in the present invention
10 minutes.
The injection molding machine of the injection molding of blended particles is not particularly limited in the present invention, can be enumerated as plunger injection molding
Machine, screw injection molding machine etc., preferably screw injection molding machine, the melting effect of screw injection molding machine blended particles are more preferable therefore excellent
Choosing；The mould of injection molding machine in the present invention is flat, mold height 1-100mm, die length 100-5000mm, width
For 100-5000mm, length or width and the ratio 20-500 of height, preferably 50-150, flat mould can be orientated graphene
Degree is high, the orientation of promotion polyethylene molecular chain, and the ratio of product width and height is big, and graphene degree of orientation is high, polyethylene
Advantages of good crystallization that molecular chain orientation degree is high, polyethylene is grown nonparasitically upon another plant, composite product high mechanical properties, therefore preferably；Material passes through spray
The temperature of mouth is 160-260 DEG C, and preferably 180-240 DEG C, material fluidity is good in this temperature range, and cooling rate is held after injection
It is easy to control, it is advantageous to；Injection pressure in the present invention is 50-300MPa, preferably 80-300MPa, and injection pressure is high, polyethylene
High with the graphene degree of orientation, advantages of good crystallization of growing nonparasitically upon another plant, Mechanical Properties of Products is good, therefore preferably；Mold temperature is 30-80 in the present invention
DEG C, the cooling velocity of material in a mold is 2-40 DEG C/min, and slow cooling polyethylene has the time of abundance in graphene surface
Grow nonparasitically upon another plant crystallization, cooling rate does not have lower limit, but considers production efficiency, and cooling velocity lower limit is 2 DEG C/min.
The test of composite material tensile strength is carried out according to national standard GB/T 1040.1-2006 in the present invention, impact strength
Test be according to national standard GB/T 1843-1996 carry out.
Compared with prior art, the present invention beneficial effect is：The present invention is made by introducing two-dimentional ultrahigh-strength graphene
The polyethylene molecular chain produced in injection molding process due to graphene space restriction effect along product long axis direction be orientated, and
It is grown nonparasitically upon another plant crystallization in graphene surface, the interface binding power between polyethylene and graphene is effectively improved, so as to utilize graphite
The graphene modified poly ethylene high-strength composite thin products of high intensity are prepared in the superhigh intensity of alkene.
Brief description of the drawings
Fig. 1 is embodiment 1（HDPE-G-1.0）With comparative example 1（NEAT HDPE）The graphene modified poly ethylene of preparation is high
The differential scanning calorimetry of intensity composite thin-type product（DSC）Curve；
Fig. 2 is embodiment 1（HDPE-G-1.0）With comparative example 1（NEAT HDPE）The graphene modified poly ethylene of preparation is high
The small angle X ray scattering of intensity composite thin-type product（SAXS）X-Y scheme；
Fig. 3 is embodiment 1（HDPE-G-1.0）With comparative example 1（NEAT HDPE）The graphene modified poly ethylene of preparation is high
The wide-angle x-ray diffraction of intensity composite thin-type product（WAXD）X-Y scheme.
Embodiment
Explanation is further described to technical scheme below by specific embodiment, but the present invention is not limited to
The embodiment.
If without specified otherwise, the raw material employed in the embodiment of the present invention is raw material commonly used in the art, is implemented
Method employed in example, is the conventional method of this area.
Embodiment 1：
By 0.1 kilogram a diameter of 5 μm, thickness 2nm, specific surface area 300m2The multi-layer graphene of/g and 9.9 kilograms of height
The mode that metered charge is respectively adopted in density polyethylene is added in double screw extruder, is uniformly mixed and is carried out at 180 DEG C
Blending 3 minutes；Then extruding pelletization obtains graphene modified poly ethylene blended particles；Above-mentioned graphene modified poly ethylene is blended
Particle is added to injection molding in injection molding machine and obtains graphene modified poly ethylene nanocomposite product, wherein, injection molding machine
Mould is flat, mold height 5mm, die length 300mm, width 200mm, the ratio 60 of length and height, wide
Degree and the ratio 40 of height, the temperature that material passes through nozzle are 180 DEG C, injection pressure 100MPa, and mold temperature is 50 DEG C, material
Cooling velocity in a mold is 10 DEG C/min.
Embodiment 2：
A kind of injection molding forming method of graphene modified poly ethylene high-strength composite thin products, specifically includes following step
Suddenly：
（1）First, by 10kg polyethylene（Low density polyethylene (LDPE)）The mode that metered charge is respectively adopted with 50g graphenes adds
Enter into double screw extruder, and be uniformly mixed and be blended in an extruder；Then the blend being blended extrusion is made
Grain obtains graphene modified poly ethylene blended particles；The graphene is the graphene with single layer structure, its is a diameter of
0.5-2 μm, thickness 0.5-2nm, specific surface area 20-30m2/g；Processing temperature is 150-250 DEG C；Process time is 0.5-
10 minutes.
（2）By step（1）Obtained graphene modified poly ethylene blended particles are added to injection molding in injection molding machine and obtain
Graphene modified poly ethylene high-strength composite thin products；Wherein：The mould of injection molding machine is flat, mold height 20mm,
Die length is 1000mm, width 1000mm, and the temperature that material passes through nozzle is 160-170 DEG C, injection pressure 50MPa,
Mold temperature is 30-80 DEG C, and the cooling velocity of material in a mold is 2-3 DEG C/min.
Embodiment 3：
A kind of injection molding forming method of graphene modified poly ethylene high-strength composite thin products, specifically includes following step
Suddenly：
（1）First, by 10kg polyethylene（High density polyethylene (HDPE)）The mode that metered charge is respectively adopted with 10g graphenes adds
Enter into double screw extruder, and be uniformly mixed and be blended in an extruder；Then the blend being blended extrusion is made
Grain obtains graphene modified poly ethylene blended particles；Processing temperature is 230-250 DEG C；Process time is 8-10 minutes；Graphene
For the graphene with single layer structure, its a diameter of 15-20 μm, thickness 5-10nm, specific surface area 50-70m2/g。
（2）By step（1）Obtained graphene modified poly ethylene blended particles are added to injection molding in injection molding machine and obtain
Graphene modified poly ethylene high-strength composite thin products；Wherein：The mould of injection molding machine is flat, mold height 100mm,
Die length is 5000mm, width 100mm, and the temperature that material passes through nozzle is 220-230 DEG C, injection pressure 300MPa,
Mold temperature is 75-80 DEG C, and the cooling velocity of material in a mold is 30-40 DEG C/min.
Embodiment 4：
A kind of injection molding forming method of graphene modified poly ethylene high-strength composite thin products, specifically includes following step
Suddenly：
（1）First, by 1kg polyethylene（Linear low density polyethylene）The side of metered charge is respectively adopted with 0.5g graphenes
Formula is added in double screw extruder, and is uniformly mixed and is blended in an extruder；Then the blend being blended is squeezed
Go out granulation and obtain graphene modified poly ethylene blended particles；Processing temperature is 150-160 DEG C；Process time is 5 minutes；Graphene
For the graphene with single layer structure, its a diameter of 0.5-1 μm, thickness 0.5-1nm, specific surface area 20-30m2/g。
（2）By step（1）Obtained graphene modified poly ethylene blended particles are added to injection molding in injection molding machine and obtain
Graphene modified poly ethylene high-strength composite thin products；Wherein：The mould of injection molding machine is flat, mold height 2mm, mould
Tool length is 100mm, width 100mm, the temperature that material passes through nozzle is 160-260 DEG C, injection pressure 100MPa, mould
It is 45-50 DEG C to have temperature, and the cooling velocity of material in a mold is 10-15 DEG C/min.
Comparative example 1：
By 0.1 kilogram a diameter of 5 μm, thickness 2nm, specific surface area 300m2The multi-layer graphene of/g and 9.9 kilograms of height
The mode that metered charge is respectively adopted in density polyethylene is added in double screw extruder, is uniformly mixed and is carried out at 180 DEG C
Blending 3 minutes；Then extruding pelletization obtains graphene modified poly ethylene blended particles；Above-mentioned graphene modified poly ethylene is blended
Particle is added to injection molding in injection molding machine and obtains graphene modified poly ethylene nanocomposite product, wherein, injection molding machine
Mould is flat, mold height 5mm, die length 300mm, width 200mm, the ratio 60 of length and height, wide
Degree and the ratio 40 of height, the temperature that material passes through nozzle are 180 DEG C, injection pressure 40MPa, and mold temperature is 20 DEG C, material
Cooling velocity in a mold is 50 DEG C/min.
Interpretation of result for embodiment 1 and comparative example, is shown in Fig. 1, Fig. 2 and Fig. 3；
It can be seen that from Fig. 1, after adding graphene, the fusing point of HDPE products improves, and shows the crystal of polyethylene in product
Thickness is thicker, therefore the product that can analyze to obtain embodiment 1 has more extended-chain crystals to generate.
It can be seen that from Fig. 2, after adding graphene, the degree of orientation higher of HDPE products, shows polyethylene in product
Crystal thickness is thicker, therefore the product that can analyze to obtain embodiment 1 has more extended-chain crystals to generate.
It is computed, the crystallinity of sample is 44.67% in comparative example；The crystallinity of sample is 57.12% in embodiment, explanation
Graphene has played crystallization nucleating agent to polyethylene, promotes the crystallization of polyethylene.
Claims (4)
- A kind of 1. injection molding forming method of graphene modified poly ethylene high-strength composite thin products, it is characterised in that specific bag Include following steps：（1）First, the mode that polyethylene and graphene are respectively adopted to metered charge is added in double screw extruder, and is being squeezed Go out and be uniformly mixed and be blended in machine；Then the blend extruding pelletization being blended is obtained into the blending of graphene modified poly ethylene Particle；0.1-50 grams of graphene is added in every kilogram of polyethylene；（2）By step（1）Obtained graphene modified poly ethylene blended particles are added to injection molding in injection molding machine and obtain graphite Alkene modified poly ethylene high-strength composite thin products；Wherein：The mould of injection molding machine is flat, mold height 1-100mm, mould Have length be 100-5000mm, the ratio 50-150 of width 100-5000mm, die length or width and height, material passes through The temperature of nozzle is 160-260 DEG C, injection pressure 50-300MPa, and mold temperature is 30-80 DEG C, material in a mold cold But speed is 5-10 DEG C/min, and the graphene is graphene with single or multiple lift structure, its a diameter of 0.5-20 μm, Thickness is 0.5-10nm, specific surface area 20-800m2/g。
- A kind of 2. injection-moulded square of graphene modified poly ethylene high-strength composite thin products according to claim 1 Method, it is characterised in that the polyethylene is high density polyethylene (HDPE), low density polyethylene (LDPE) or linear low density polyethylene.
- A kind of 3. injection-moulded square of graphene modified poly ethylene high-strength composite thin products according to claim 1 Method, it is characterised in that step（1）Mixed process in, the processing temperature be 150-250 DEG C.
- A kind of 4. injection-moulded square of graphene modified poly ethylene high-strength composite thin products according to claim 1 Method, it is characterised in that step（1）Mixed process in, the process time be 0.5-10 minutes.
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| CN111635575A (en) * | 2020-06-20 | 2020-09-08 | 上海旗华水上工程建设股份有限公司 | Graphene floating body for water floating system |
| CN111647215A (en) * | 2020-06-20 | 2020-09-11 | 上海旗华水上工程建设股份有限公司 | Graphene floating body for floating system of offshore photovoltaic power station |
| CN112895366B (en) * | 2021-03-19 | 2022-02-11 | 珠海格力电器股份有限公司 | Method and device for determining pressure maintaining position of injection molding machine |
| CN113235177B (en) * | 2021-05-24 | 2021-12-28 | 嘉兴市新丰特种纤维有限公司 | Preparation process and device of PP/PE low-melting-point composite fiber |
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