阅读说明：本技术 石墨烯塑胶复合导热材料、制备工艺及其制品 (Graphene plastic composite heat conduction material, preparation process and product thereof ) 是由 杜正义 于 2020-05-25 设计创作，主要内容包括：本发明属于石墨烯复合材料加工制备技术领域,具体涉及一种石墨烯塑胶复合导热材料、制备工艺及其制品。其包括按质量计的如下组分：塑胶料35％；石墨烯10％；陶瓷粉44％；阻燃剂4％；纤维材料5％；助剂2％。本申请提供的石墨烯塑胶复合导热材料及其制品,通过在高分子聚合物的熔体分子间形成结晶核,改善了熔体的结晶品质,通过金属氧化物的掺杂和复合作用,增大了石墨烯片层或石墨烯单体之间的层间间距,形成了稳定均匀的三维导热网络,既改善了材料的导热性能,又保证了制品的机械性能,优化了生产成本,具有显著的技术进步意义。(The invention belongs to the technical field of processing and preparation of graphene composite materials, and particularly relates to a graphene plastic composite heat conduction material, a preparation process and a product thereof. The composite material comprises the following components in parts by mass: 35% of plastic material; 10% of graphene; 44% of ceramic powder; 4% of a flame retardant; 5% of fiber material; and 2% of an auxiliary agent. The application provides a graphite alkene plastic composite heat conduction material and goods thereof, through forming the crystal nucleus between the fuse-element molecule at high-molecular polymer, improved the crystallization quality of fuse-element, through metal oxide's doping and composite action, increased the interlaminar interval between graphite alkene lamellar or the graphite alkene monomer, formed stable even three-dimensional heat conduction network, both improved the heat conductivility of material, guaranteed the mechanical properties of goods again, optimized manufacturing cost, had apparent technological progress meaning.)

1. The graphene plastic composite heat conduction material is characterized by comprising the following components in parts by mass:

30-40% of plastic material;

8% -12% of graphene;

40% -46% of ceramic powder;

2-6% of a flame retardant;

3-7% of fiber material;

0.5 to 3.5 percent of auxiliary agent.

2. The graphene plastic composite heat conduction material according to claim 1, comprising the following components by mass:

35% of plastic material;

8% -12% of graphene;

40% -46% of ceramic powder;

4% of a flame retardant;

5% of fiber material;

and 2% of an auxiliary agent.

3. The graphene plastic composite heat conduction material according to claim 2, comprising the following components by mass:

35% of plastic material;

10% of graphene;

44% of ceramic powder;

4% of a flame retardant;

5% of fiber material;

and 2% of an auxiliary agent.

4. The graphene plastic composite heat conduction material of claim 1, wherein:

the plastic material is PA6 or PA 66.

5. The graphene plastic composite heat conduction material of claim 1, wherein:

the auxiliary agent comprises a dispersing agent and an antioxidant;

the dispersing agent is fatty acid dispersing agent and/or paraffin dispersing agent, and the fatty acid dispersing agent is at least one of ethylene bis stearamide and stearic acid monoglyceride;

the antioxidant is an aromatic antioxidant and/or a hindered phenol antioxidant, the aromatic antioxidant is at least one of diphenylamine and p-phenylenediamine, and the hindered phenol antioxidant is one or more of 2, 6-tertiary butyl-4-methylphenol and pentaerythritol ester.

6. The graphene plastic composite heat conduction material of claim 1, wherein:

the flame retardant is an organic flame retardant and/or an inorganic flame retardant, the organic flame retardant is at least one of a brominated flame retardant, a phosphorus-nitrogen flame retardant and a nitrogen flame retardant, and the inorganic flame retardant is at least one of antimony trioxide, magnesium hydroxide, aluminum hydroxide and red phosphorus.

7. The graphene plastic composite heat conduction material of claim 1, wherein:

the fiber material is a carbon fiber material or a glass fiber material.

8. A preparation process of a graphene plastic composite heat conduction material is characterized by comprising the following steps:

a material mixing step, namely weighing and uniformly mixing the plastic material, the graphene, the ceramic powder, the flame retardant and the heat conduction auxiliary agent according to the proportion of the graphene plastic composite heat conduction material in any one of claims 1 to 7;

and a forming step, namely feeding the mixed material prepared in the mixing step into a first section of barrel of a double-screw extruder, meanwhile, weighing a certain amount of fiber material according to the proportion of the graphene plastic composite heat conduction material in any one of claims 1 to 7, adding the fiber material into the last section of barrel of the double-screw extruder, and performing extrusion forming through the double-screw extruder to obtain the graphene plastic composite heat conduction material.

9. A graphene plastic composite heat conduction material product comprises a product structure body and is characterized in that: the product structure is made of the graphene plastic composite heat conduction material as claimed in any one of claims 1 to 7.

10. The graphene plastic composite thermal conductive material product according to claim 9, wherein: the product structure has a thermal conductivity of 4.0W/m.K or more, and a tensile resistance value of 13.5kgf/cm or more in a tension test of the embedded nut²The torque resistance value of the embedded nut in the torque test is not less than 4.2kgf/cm²。

Technical Field

The invention belongs to the technical field of processing and preparation of graphene composite materials, and particularly relates to a graphene plastic composite heat conduction material, a preparation process and a product thereof.

Background

In the existing plastic materials adopting graphene to improve the thermal conductivity, especially in the application fields of electronic products, electrical equipment and the like with higher requirements on the thermal conductivity and the mechanical property, at least one short plate generally exists on three indexes of the thermal conductivity, the mechanical property and the production cost, in other words, no plastic composite material which can perfectly replace a metal product and completely meet the technical standard of industrial application exists in the prior art.

Disclosure of Invention

In view of this, the invention provides a novel graphene plastic composite heat conduction material, a preparation process and a product thereof, so as to solve the technical problems in the prior art.

The graphene plastic composite heat conduction material provided by the invention for solving the technical problem is as follows:

the graphene plastic composite heat conduction material comprises the following components in parts by mass: 30-40% of plastic material; 8% -12% of graphene; 40% -46% of ceramic powder; 2-6% of a flame retardant; 3-7% of fiber material; 0.5 to 3.5 percent of auxiliary agent.

Preferably, the graphene plastic composite heat conduction material comprises the following components by mass: 35% of plastic material; 8% -12% of graphene; 40% -46% of ceramic powder; 4% of a flame retardant; 5% of fiber material; and 2% of an auxiliary agent.

Preferably, the graphene plastic composite heat conduction material comprises the following components by mass: 35% of plastic material; 10% of graphene; 44% of ceramic powder; 4% of a flame retardant; 5% of fiber material; and 2% of an auxiliary agent.

Preferably, the plastic material is PA6 or PA 66.

Preferably, the auxiliary agent comprises a dispersant and an antioxidant; the dispersant is fatty acid dispersant and/or paraffin dispersant, and the fatty acid dispersant is at least one of ethylene bis stearamide and stearic acid monoglyceride; the antioxidant is aromatic antioxidant and/or hindered phenol antioxidant, the aromatic antioxidant is at least one of diphenylamine and p-phenylenediamine, and the hindered phenol antioxidant is one or more of 2, 6-tertiary butyl-4-methylphenol and pentaerythritol ester.

Preferably, the flame retardant is an organic flame retardant and/or an inorganic flame retardant, the organic flame retardant is at least one of a brominated flame retardant, a phosphorus-nitrogen flame retardant and a nitrogen flame retardant, and the inorganic flame retardant is at least one of antimony trioxide, magnesium hydroxide, aluminum hydroxide and red phosphorus.

Preferably, the graphene is single-layer graphene or multi-layer graphene with 2-100 layers.

Preferably, the fibrous material is a carbon fiber material or a glass fiber material.

The preparation process of the graphene plastic composite heat conduction material provided by the invention for solving the technical problem comprises the following steps:

a preparation process of a graphene plastic composite heat conduction material comprises the following steps:

a material mixing step, namely weighing and uniformly mixing the plastic material, the graphene, the ceramic powder, the flame retardant and the auxiliary agent according to the proportion of the graphene plastic composite heat conduction material recorded in any one technical scheme;

and a forming step, namely feeding the mixed material prepared in the mixing step into a first section of barrel of a double-screw extruder, meanwhile, weighing a certain amount of fiber material according to the proportion of the graphene plastic composite heat conduction material recorded in any one technical scheme, adding the fiber material into the last section of barrel of the double-screw extruder, and performing extrusion forming through the double-screw extruder to obtain the graphene plastic composite heat conduction material.

The graphene plastic composite heat conduction material product provided by the invention for solving the technical problem is as follows:

a graphene plastic composite heat conduction material product comprises a product structure body and is characterized in that: the product structure is made of the graphene plastic composite heat conduction material recorded in any one of the technical schemes.

Preferably, the product structure has a thermal conductivity of 4.0W/m.K or more and a tensile resistance value of 13.5kgf/cm or more in a tension test of the embedded nut²The torque resistance value of the embedded nut in the torque test is not less than 4.2kgf/cm²。

The beneficial technical effects are as follows:

the graphene plastic composite heat conduction material, the preparation process and the product thereof provided by the application are characterized in that 8% -12% of graphene is added to improve the heat conduction performance of a plastic material, 3% -7% of a fiber material is added to improve the mechanical performance of the plastic material, 40% -46% of ceramic powder is added to serve as a crystallization auxiliary agent and a graphene carrier, on one hand, the ceramic powder can form uniformly distributed crystallization nuclei between melt molecules of a high-molecular polymer plastic material and the fiber material to improve the crystallization quality of a melt, on the other hand, oxides in the ceramic powder can also increase the interlayer spacing between graphene sheet layers or graphene monomers through doping and compounding effects to prevent the graphene from agglomerating in the crystallization process to form a graphene carrier, so that a stable and uniform three-dimensional heat conduction network can be formed in the material to effectively improve the heat conduction performance of the material, but also ensures the mechanical property of the product, optimizes the production cost and has obvious technical progress significance.

The technical solutions and technical effects of the present application will be described in detail below with reference to the drawings and the detailed description of the present application.

Drawings

FIG. 1: embedding a nut solid sample graph;

FIG. 2: embedding a nut tensile force tolerance value field test chart;

FIG. 3: and (3) embedding a nut torsion tolerance value field test chart.

Detailed Description

Preferred embodiment 1

The graphene plastic composite heat conduction material disclosed in the embodiment comprises the following components by mass: 35% of plastic material; 10% of graphene; 44% of ceramic powder; 4% of a flame retardant; 5% of fiber material; and 2% of an auxiliary agent. The plastic material is PA6, the graphene is 2-10 layers of graphene, the flame retardant is a brominated flame retardant, the fiber material is carbon fiber, the dispersing agent in the auxiliary agent is ethylene bis stearamide, the antioxidant in the auxiliary agent is p-phenylenediamine, and the ratio of the dispersing agent to the antioxidant is 1:1 in parts by mass.

The preparation process comprises a mixing step and a forming step.

A material mixing step, namely weighing and uniformly mixing a plastic material, graphene, ceramic powder, a flame retardant and an auxiliary agent according to the proportion of the graphene plastic composite heat conduction material; stirring for 8-10 minutes by using a high-speed mixer to complete mixing;

and a forming step, namely feeding the mixed material prepared in the mixing step into a first section of barrel of a double-screw extruder, meanwhile, weighing a certain amount of fiber material according to the proportion of the graphene plastic composite heat conduction material, adding the fiber material into the last section of barrel of the double-screw extruder, and performing extrusion forming through the double-screw extruder to obtain the graphene plastic composite heat conduction material. The rotating speed of the double-screw extruder is 1150r/min, and the temperature of each zone of the double-screw extruder is as follows:

the temperature of the first zone is 230-.

Preferred embodiment two

The graphene plastic composite heat conduction material disclosed in the embodiment comprises the following components by mass: 40% of plastic material; 8% of graphene; 40% of ceramic powder; 4% of a flame retardant; 6% of fiber material; and 2% of an auxiliary agent. The plastic material is PA66, the graphene is 2-10 layers of graphene, the flame retardant is a brominated phosphorus-nitrogen flame retardant, the fiber material is glass fiber, the dispersing agent in the auxiliary agent is ethylene-based bis-stearamide, the antioxidant in the auxiliary agent is p-phenylenediamine, and the mass part ratio of the dispersing agent to the antioxidant is 1: 1.

The preparation process is the same as that of the first preferred embodiment, and can be referred to by the person skilled in the art.

Preferred embodiment three

The graphene plastic composite heat conduction material disclosed in the embodiment comprises the following components by mass: 35.5% of plastic material; 12% of graphene; 46% of ceramic powder; 3% of a flame retardant; 3% of a fiber material; 0.5 percent of auxiliary agent. The plastic material is PA66, the graphene is 2-10 layers of graphene, the flame retardant is a brominated phosphorus-nitrogen flame retardant, the fiber material is glass fiber, the dispersing agent in the auxiliary agent is ethylene-based bis-stearamide, the antioxidant in the auxiliary agent is p-phenylenediamine, and the mass part ratio of the dispersing agent to the antioxidant is 1: 1.

The preparation process is the same as that of the first preferred embodiment, and can be referred to by the person skilled in the art.

Technical index evaluation

1. Testing the heat conductivity coefficients of the three groups of samples by using a Hot Disk heat conductivity coefficient instrument;

2. testing the tensile force tolerance values of the three groups of samples by adopting an automatic push-pull dynamometer; and (3) testing procedures: carrying out a tension test on the M2 embedded copper nut until the maximum tension can be borne; and (4) testing standard: the embedded nut is not pulled up, loosened, slipped and broken.

3. Testing the torque tolerance values of the three groups of samples by adopting an electric torque batch and a torque corrector; and (3) testing procedures: carrying out torsion test on the M2 embedded copper nut until the maximum torsion can be borne; and (4) testing standard: the embedded nut has no looseness and no fracture around.

4. Test results

5. As can be seen from the table, the average thermal conductivity of the three groups of samples was 4.371W/m.K, and the average tensile resistance of the embedded nut was 13.63kgf/cm²The average torque resistance value of the embedded nut is 4.62kgf/cm². The average thermal conductivity coefficient exceeds that of the similar graphene modified product, the average tensile force tolerance value and the average torsion force tolerance value are close to the average reference value of the same plastic, and both exceed the product acceptance standard of a customer.

Therefore, the graphene plastic composite heat conduction material and the product thereof provided by the application improve the crystallization quality of the melt by forming the crystallization nucleus between the melt molecules of the high-molecular polymer plastic material and the fiber material, increase the interlayer spacing between graphene sheet layers or graphene monomers by doping and compounding the ceramic powder metal oxide, and form a stable and uniform three-dimensional heat conduction network, thereby improving the heat conduction performance of the material, ensuring the mechanical performance of the product, optimizing the production cost, and having significant technical progress significance.

While the invention has been described in detail and with reference to the drawings and specific embodiments thereof, it should be understood that the specific embodiments disclosed in the specification are merely exemplary embodiments of the invention, and that other embodiments may be developed by those skilled in the art; any simple modifications and equivalents without departing from the innovative concept of the present invention are intended to be included within the scope of the present patent.