Preparation method for composite modification of carbon nanotube and PE material

Abstract

The invention relates to the technical field of chemical material compounding, in particular to a preparation method for composite modification of a carbon nano tube and a PE (polyethylene) material, which comprises the following steps: drying PP (polypropylene) plastic at 60 DEG C for 2 hours; adding the carbon nano tube and the PE plastic into a mixing mill for mixing for 10 minutes; extruding and granulating through a double-screw extruder under the conditions that the temperature is 220 DEG C and the rotating speed is 100r / min to obtain a modified plastic sample; adjusting the ratio of the carbon nanotubes to the PE plastic to obtain a plurality of modified plastic samples; the melting point change of multiple samples is observed through a microscope, the melting point of the carbon nano tube and PE composite material prepared through the method is increased, the existing low-melting-point PE plastic is improved, the melting point of the PE plastic compounded with the carbon nano tube is increased, the application range of the PE plastic is wider, and in the modification preparation process of the PE plastic, the melting point of the PE plastic is increased. A plurality of samples are obtained by adjusting the mixing ratio of the carbon nanotubes to the PE plastic, so that the influence of the ratio of the carbon nanotubes to the PE on the melting point of the modified plastic in the modified plastic is conveniently researched.

Description

Technical Field

[0001] The invention relates to the technical field of chemical material composites, in particular to a preparation method for composite modification of carbon nanotubes and PE materials. Background Art

[0002] Polyethylene (PE) is a thermoplastic resin made by polymerizing ethylene monomers. Industrially, it also includes copolymers of ethylene with small amounts of α-olefins. Polyethylene is odorless, non-toxic, waxy, and has excellent low-temperature resistance (minimum operating temperature can reach -100 to -70°C). It is chemically stable because the polymer molecules are connected by carbon-carbon single bonds, making it resistant to corrosion by most acids and bases (but not oxidizing acids). It is insoluble in common solvents at room temperature, has low water absorption, and exhibits excellent electrical insulation properties. Polyethylene is very sensitive to environmental stresses (chemical and mechanical) and can be processed using standard thermoplastic molding methods. Polyethylene has a wide range of applications, primarily in the manufacture of films, packaging materials, containers, pipes, monofilaments, wire and cable, and consumer goods. Since their discovery, carbon nanotubes (CNTs) have garnered significant interest. CNTs have excellent mechanical properties, good chemical and thermal stability, good electrical properties and microwave absorption, and have the unique nano-effect of a unique one-dimensional nanostructure, making them an ideal reinforcement for polymer materials and giving them many new functions.

[0003] The melting point of current PE plastics is relatively low, which leads to a narrow application range. Therefore, the present invention proposes a preparation method of composite modification of carbon nanotubes and PE materials to achieve improvement on the above problem. Summary of the Invention

[0004] The purpose of the present invention is to provide a preparation method of composite modification of carbon nanotubes and PE materials to solve the problem mentioned in the above background technology that the melting point of existing PE plastics is relatively low, resulting in a narrow range of applications.

[0005] To achieve the above object, the present invention provides the following technical solution: a preparation method for composite modification of carbon nanotubes and PE materials, comprising the following steps:

[0006] S1. Dry the PP plastic at 60°C for 2h;

[0007] S2, adding carbon nanotubes and PE plastic into a mixer and mixing for 10 minutes;

[0008] S3, extruding and granulating the modified plastic sample through a twin-screw extruder at 220°C and a rotation speed of 100 r / min;

[0009] S4, adjusting the ratio of carbon nanotubes to PE plastic in step S2, and executing step S3 to obtain a plurality of modified plastic samples;

[0010] S5. Observe the melting point changes of multiple samples under a microscope.

[0011] The present invention is further configured as follows: 100 parts of the PE plastic and 0 parts of the carbon nanotubes are used to obtain sample 1 in step S3, and the sample 1 is a control sample.

[0012] The present invention is further configured such that 99 parts of the PE plastic and 1 part of the carbon nanotube are used to obtain sample 2 in step S3.

[0013] The present invention is further configured such that 97 parts of the PE plastic and 3 parts of the carbon nanotubes are used to obtain sample three in step S3.

[0014] The present invention is further configured as follows: 95 parts of the PE plastic and 5 parts of the carbon nanotubes are used to obtain sample four in step S3.

[0015] The present invention also provides a carbon nanotube and PE composite material prepared by the method.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention prepares a modified plastic sample by drying PP plastic at 60°C for 2 hours, then adding carbon nanotubes and PE plastic into a mixer and mixing for 10 minutes, and finally extruding and granulating the plastic through a twin-screw extruder at 220°C and a rotation speed of 100 r / min. The melting point of the carbon nanotube and PE composite material prepared by the above method is increased, thereby improving the current low-melting-point PE plastic. The melting point of the PE plastic after compounding with carbon nanotubes is increased, and its application range is expanded.

[0018] At the same time, in order to better study the melting point changes of the modified plastic, the ratio of carbon nanotubes to PE plastics was adjusted to obtain multiple modified plastic samples. The melting point changes of multiple samples were observed under a microscope. Based on the melting point change values ​​of the above samples, the influence of the corresponding ratio of carbon nanotubes to PE plastics on the melting point of the modified plastic was obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the effect of the amount of carbon nanotubes added on the modified plastic in the present invention;

[0020] Figure 2 This is a schematic diagram of the melting point change of sample 1 in the present invention;

[0021] Figure 3 This is a schematic diagram of the melting point change of sample 2 in the present invention;

[0022] Figure 4This is a schematic diagram of the melting point change of sample 3 in the present invention;

[0023] Figure 5 This is a schematic diagram of the melting point change of sample 4 in the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] Example

[0026] See also Figure 1-5 , in the figure: This embodiment is a preferred embodiment of the present technical solution, a preparation method of composite modification of carbon nanotubes and PE materials, comprising the following steps:

[0027] S1. Dry the PP plastic at 60°C for 2h;

[0028] S2, adding carbon nanotubes and PE plastic into a mixer and mixing for 10 minutes;

[0029] S3, extruding and granulating the modified plastic sample through a twin-screw extruder at 220°C and a rotation speed of 100 r / min;

[0030] S4, adjusting the ratio of carbon nanotubes to PE plastic in step S2, and executing step S3 to obtain a plurality of modified plastic samples;

[0031] S5. Observe the melting point changes of multiple samples through a microscope

[0032] Furthermore, the present invention also provides a carbon nanotube and PE composite material prepared by the above method. To facilitate the study of the effect of the mixing ratio of carbon nanotubes and PE plastic on the melting point of the modified plastic, in step S2, the mixing ratio of carbon nanotubes and PE plastic is adjusted, and in step S3, the modified plastic is extruded and granulated using a twin-screw extruder at 220°C and a rotation speed of 100 r / min to obtain multiple modified plastic samples.

[0033] Among them, 100 parts of PE plastic and 0 parts of carbon nanotubes are used to obtain sample 1 in step S3, and sample 1 is a control sample; 99 parts of PE plastic and 1 part of carbon nanotubes are used to obtain sample 2 in step S3; 97 parts of PE plastic and 3 parts of carbon nanotubes are used to obtain sample 3 in step S3; 95 parts of PE plastic and 5 parts of carbon nanotubes are used to obtain sample 4 in step S3. The melting point changes of the above samples are observed under a microscope, and it is found that sample 1 changes at 120.3°C, sample 2 changes at 125.2°C, sample 3 changes at 133.3°C, and sample 4 changes at 133°C. Based on the melting point change values ​​of the above samples, the influence of the corresponding ratio of carbon nanotubes to PE plastics on the melting point of the modified plastic is obtained.

[0034] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0035] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A preparation method for composite modification of carbon nanotubes and PE materials, characterized in that: The following steps are involved: S1. Dry the PP plastic at 60°C for 2h; S2, adding carbon nanotubes and PE plastic into a mixer and mixing for 10 minutes; S3, extruding and granulating the modified plastic sample through a twin-screw extruder at 220°C and a rotation speed of 100 r / min; S4, adjusting the ratio of carbon nanotubes to PE plastic in step S2, and executing step S3 to obtain a plurality of modified plastic samples; S5. Observe the melting point changes of multiple samples under a microscope.

2. The preparation method of composite modification of carbon nanotubes and PE materials according to claim 1, characterized in that: 100 parts of the PE plastic and 0 parts of the carbon nanotubes are used to obtain sample 1 in step S3. Sample 1 is a control sample.

3. The preparation method of composite modification of carbon nanotubes and PE materials according to claim 1, characterized in that: 99 parts of the PE plastic and 1 part of the carbon nanotube are used to obtain sample 2 in step S3.

4. The preparation method of composite modification of carbon nanotubes and PE materials according to claim 1, characterized in that: 97 parts of the PE plastic and 3 parts of the carbon nanotubes are used to obtain sample three in step S3.

5. The preparation method of composite modification of carbon nanotubes and PE materials according to claim 1, characterized in that: 95 parts of the PE plastic and 5 parts of the carbon nanotubes are used to obtain sample 4 in step S3.

6. The method for preparing the carbon nanotube and PE composite material according to claim 1.

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