阅读说明：本技术 一种改性石墨烯复合铝合金的制备方法 (preparation method of modified graphene composite aluminum alloy ) 是由 庄狄烽 林衍廷 于 2019-09-05 设计创作，主要内容包括：本发明公开了改性石墨烯复合铝合金的制备方法：1)石墨烯添加液的配制：按重量份数先将2-5份的纳米级石墨烯和80-100份的N-甲基-2-吡咯烷酮混合均匀并通过分散机进行分散,形成石墨烯分散液,再和300-400份的去离子水混合,制成石墨烯添加液；2)铝条的压延：将厚度在4-8mm的铝条通过铝条冷扎机进行n道压延,压延至厚度1-2mm；在此过程中,分别在第一道、第二道……第m道的扎轮上添加石墨烯添加液,其中,n为大于3的正整数,n为大于2的正整数,且m≤n；在压延的过程中,铝条发热,表面形成热膨胀效果,产生毛细孔,石墨烯添加液渗入毛细孔中,经过前m道的压延并渗入石墨烯后,进行能谱分析,确保石墨烯在铝条表面成分中所占的比例为10％~40％。(The invention discloses a preparation method of a modified graphene composite aluminum alloy, which comprises the following steps: 1) preparing a graphene additive solution: uniformly mixing 2-5 parts of nano-graphene and 80-100 parts of N-methyl-2-pyrrolidone in parts by weight, dispersing by a dispersion machine to form graphene dispersion liquid, and mixing with 400 parts of 300-fold ion water to prepare a graphene addition liquid; 2) and (3) rolling of the aluminum strip: carrying out n-pass rolling on the aluminum strip with the thickness of 4-8mm by an aluminum strip cold rolling machine until the thickness is 1-2 mm; in the process, adding graphene addition liquid on the mth rolling wheel of the first pass … … and the second pass … … respectively, wherein n is a positive integer greater than 3, n is a positive integer greater than 2, and m is less than or equal to n; in the calendering process, the aluminum strip heats, a thermal expansion effect is formed on the surface of the aluminum strip, pores are generated, the graphene additive solution permeates into the pores, and after the graphene is calendered and permeated in the previous m passes, energy spectrum analysis is performed to ensure that the graphene accounts for 10% -40% of the surface components of the aluminum strip.)

1. The preparation method of the modified graphene composite aluminum alloy is characterized by comprising the following steps:

1) Preparing a graphene additive solution: uniformly mixing 2-5 parts of nano-graphene and 80-100 parts of N-methyl-2-pyrrolidone in parts by weight, dispersing by a dispersion machine to form graphene dispersion liquid, and mixing with 400 parts of 300-fold ion water to prepare a graphene addition liquid;

2) And (3) rolling of the aluminum strip: carrying out n-pass rolling on the aluminum strip with the thickness of 4-8mm by an aluminum strip cold rolling machine until the thickness is 1-2 mm; in the process, adding graphene addition liquid on the mth rolling wheel of the first pass … … and the second pass … … respectively, wherein n is a positive integer greater than 3, n is a positive integer greater than 2, and m is less than or equal to n; in the calendering process, the aluminum strip heats, a thermal expansion effect is formed on the surface of the aluminum strip, pores are generated, the graphene additive solution permeates into the pores, and after the graphene is calendered and permeated in the previous m passes, energy spectrum analysis is performed to ensure that the graphene accounts for 10% -40% of the surface components of the aluminum strip.

2. The method for preparing the modified graphene composite aluminum alloy according to claim 1, wherein the step 1) further comprises the following steps: and adjusting the pH value of the graphene additive solution to 7-9 by adding liquid alkali, sodium hydroxide or potassium hydroxide.

3. The method for preparing the modified graphene composite aluminum alloy according to claim 1, wherein in the step 2), each rolling of the aluminum strip cold rolling machine includes an upper rolling wheel and a lower rolling wheel which are arranged in a matching manner, the upper rolling wheel and the lower rolling wheel are provided with rolling grooves, the rolling grooves of the upper rolling wheel and the lower rolling wheel are matched to form a rolling hole, and the thickness of the rolling hole is gradually reduced along with each rolling, specifically, the thickness of each rolling hole is 0.1-0.5 mm.

4. The preparation method of the modified graphene composite aluminum alloy according to claim 3, wherein in the step 2), the front m lines of the aluminum strip cold rolling machine are rolled, and a graphene additive liquid feeding device is arranged corresponding to the rolling line of the upper rolling wheel.

5. the preparation method of the modified graphene composite aluminum alloy according to claim 3, wherein the graphene additive solution feeding device comprises a solution feeding wheel and a solution feeding funnel assembly, wherein the solution feeding wheel is matched with the rolling wheel.

6. The method for preparing the modified graphene composite aluminum alloy according to claim 1, wherein in the step 2), the aluminum strip is formed by aluminum extrusion and then stretching, and is subjected to oil removal and oxide film removal through a cleaning tank.

Technical Field

The invention relates to preparation of aluminum alloy, in particular to a preparation method of a modified graphene composite aluminum alloy.

Background

Graphene (Graphene) is a two-dimensional carbon nanomaterial composed of carbon atoms in sp hybridized orbitals into a hexagonal honeycomb lattice. The graphene has excellent optical, electrical and mechanical properties, and has important application prospects in the aspects of materials science, micro-nano processing, energy, biomedicine, drug delivery and the like. However, graphene is rarely applied to modification of aluminum bar products at present, and even if graphene is used, the modification process is generally the overall performance modification performed during aluminum alloy material smelting, the process is complex, the cost is high, and the modification effect is poor. Therefore, the existing preparation method of the graphene composite aluminum alloy has many unreasonable places, and needs to be improved and perfected.

disclosure of Invention

In view of the above disadvantages, the present invention aims to provide a preparation method of a modified graphene composite aluminum alloy, which can perform graphene composite modification on the surface of an aluminum alloy in the subsequent aluminum strip calendering process, and has the advantages of scientific, reasonable, simple and feasible process flow, convenience for industrialization, low process cost, good modification effect and high cost performance.

the technical scheme adopted by the invention is as follows: the preparation method of the modified graphene composite aluminum alloy is characterized by comprising the following steps:

1) Preparing a graphene additive solution: uniformly mixing 2-5 parts of nano-graphene and 80-100 parts of N-methyl-2-pyrrolidone in parts by weight, dispersing by a dispersion machine to form graphene dispersion liquid, and mixing with 400 parts of 300-fold ion water to prepare a graphene addition liquid;

2) and (3) rolling of the aluminum strip: carrying out n-pass rolling on the aluminum strip with the thickness of 4-8mm by an aluminum strip cold rolling machine until the thickness is 1-2 mm; in the process, adding graphene addition liquid on the mth rolling wheel of the first pass … … and the second pass … … respectively, wherein n is a positive integer greater than 3, n is a positive integer greater than 2, and m is less than or equal to n; in the calendering process, the aluminum strip heats, a thermal expansion effect is formed on the surface of the aluminum strip, pores are generated, the graphene additive solution permeates into the pores, and after the graphene is calendered and permeated in the previous m passes, energy spectrum analysis is performed to ensure that the graphene accounts for 10% -40% of the surface components of the aluminum strip.

further, the step 1) also comprises the following steps: and adjusting the pH value of the graphene additive solution to 7-9 by adding liquid alkali, sodium hydroxide or potassium hydroxide.

Further, in the step 2), each rolling of the aluminum strip cold rolling machine comprises an upper rolling wheel and a lower rolling wheel which are arranged in a matched manner, the upper rolling wheel and the lower rolling wheel are provided with rolling grooves, the rolling grooves of the upper rolling wheel and the lower rolling wheel are matched to form a rolling hole, the thickness of the rolling hole is gradually reduced along with each rolling, and specifically, the thickness of each rolling hole is 0.1-0.5 mm.

Further, in the step 2), the front m paths of rolling of the aluminum strip cold rolling machine are provided with a graphene additive liquid feeding device corresponding to the rolling path of the upper rolling wheel.

Further, the graphene additive liquid feeding device comprises a liquid feeding wheel and a liquid feeding funnel assembly, wherein the liquid feeding wheel is matched with the upper binding wheel.

further, in step 2), the aluminum strip is extruded and then stretch-formed through aluminum, and is degreased and oxidized film is removed through a cleaning tank.

The invention has the following advantages: the special graphene additive solution with extremely strong surface binding property is prepared, capillary pores generated by high-temperature thermal expansion in the aluminum strip calendering process are matched, and the graphene additive solution is combined in a penetration manner, so that the graphene composite modification can be carried out on the surface of the aluminum alloy in the subsequent aluminum strip calendering and forming process, the process flow is scientific, reasonable, concise and feasible, the industrialization is facilitated, the process cost is low, the modification effect is good, and the cost performance is extremely high.

The present invention will be further described with reference to the following description and embodiments in conjunction with the accompanying drawings.

drawings

FIG. 1 is a first schematic structural diagram of an aluminum strip cold rolling machine;

FIG. 2 is a second schematic structural view of an aluminum strip cold rolling machine;

FIG. 3 is a graph of energy spectrum analysis according to the first embodiment;

FIG. 4 is a graph of energy spectrum analysis of the second embodiment;

FIG. 5 is a graph of energy spectrum analysis of an unmodified conventional aluminum strip;

in the figure: a binding wheel 1 is arranged; and a rolling wheel 2.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that if directional indications (such as … …, which is up, down, left, right, front, back, top, bottom, inner, outer, vertical, transverse, longitudinal, counterclockwise, clockwise, circumferential, radial, axial) are provided in the embodiments of the present invention, the directional indications are only used for explaining the relative position relationship, motion condition, etc. of the components at a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first" or "second", etc. in the embodiments of the present invention, the description of "first" or "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.