Flexible electronic heating film based on carbon black reinforcement and preparation method thereof

Abstract

The invention provides a flexible electronic heating film based on carbon black reinforcement, which comprises a polymer film and a carbon black conductive film, the carbon black conductive film is arranged on the polymer film, carbon black aggregates formed by carbon black powder in the carbon black conductive film are distributed in a three-dimensional network structure, the two sides of the carbon black conductive film are also connected with wires, and the wires are connected with the polymer film and the carbon black conductive film. In the using process of the flexible electronic heating film based on carbon black reinforcement, historical temperature data are input through a trained LSTM model, the temperature of a plurality of time points in the future is predicted, input voltage or current is adjusted in real time according to the prediction result, and the temperature of the flexible electronic heating film is predicted. And the heating temperature of the thin film is kept between ideal 50 DEG C and 60 DEG C by utilizing PID (Proportion Integration Differentiation) control.

Description

Technical Field

[0001] The present invention belongs to the technical field of thin film heating in the semiconductor industry, and specifically relates to a flexible electronic heating film based on carbon black reinforcement and a preparation method thereof. Background Art

[0002] Flexible electronic heating films belong to the field of temperature control, and their main applications are heating in winter, temperature control in the semiconductor manufacturing process, etc. Especially in the semiconductor field, flexible electronic films can be used as relatively perfect temperature control elements in the semiconductor industry. Flexible electronic film devices themselves have the characteristics of light weight, high temperature resistance, and bendability, which means that flexible electronic films can be more tightly and accurately covered on the surface of semiconductor devices, thereby improving the heat exchange efficiency and temperature control accuracy of semiconductor devices. In addition, the flexible electronic film is small in size, which can effectively reduce the occupied space and meet the design requirements of highly integrated semiconductor manufacturing. However, the main disadvantage of the current flexible electronic heating film is that the conductive filler of the film is usually expensive conductive filler such as graphene and carbon nanotubes, resulting in high cost and high price of the film, and the complicated production process is not conducive to large-scale use. Therefore, we designed a flexible electronic heating film based on carbon black powder reinforcement, and doped the cheap conductive carbon black powder into the polymer flexible film to give the polymer film excellent electrical and thermal conductivity, thereby achieving a good heating effect and a flexible electronic heating film that can be used on a large scale. In order to further improve the performance of the film, the present invention also combines time series analysis and machine learning technology. When the film is actually used, we use time series prediction models such as long short-term memory networks (LSTM) to predict temperature changes, and then introduce PID control to prevent the film from overheating or underheating. Summary of the invention

[0003] The purpose of the present invention is to connect the heating film to a low-voltage power supply, and the electrons are conductively heated through the carbon black network in the film, so as to optimize the carbon black doping amount to achieve excellent conductivity and heating effects, and provide a flexible electronic heating film based on carbon black reinforcement and a preparation method thereof;

[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a flexible electronic heating film based on carbon black reinforcement, comprising: a polymer film and a carbon black conductive film;

[0005] The carbon black conductive film is arranged on the polymer film, and the carbon black agglomerates formed by carbon black powder inside the carbon black conductive film are distributed in a three-dimensional network structure, and wires are connected to both sides of the carbon black conductive film.

[0006] Furthermore, the thickness of the polymer film and the carbon black conductive film are both 0.5 cm±0.1 cm.

[0007] Furthermore, the temperature adjustment method of the carbon black conductive film is:

[0008] Step 1: Collect the temperature change data of the film under different environments, establish a data set, and train the long short-term memory network model so that the trained long short-term memory network model can accurately predict the future temperature change of the film and ensure that the film does not exceed the preset temperature range during operation. The error between the predicted temperature and the actual measured temperature can be evaluated by the mean square error;

[0009] Step 2: Collect the temperature data of the film in real time and use the trained long short-term memory network model for prediction, where the input of the model is the past temperature series data and the output is the temperature prediction value for the next few time steps;

[0010] Step 3: Based on the temperature change curve predicted by the trained long short-term memory network model, when the predicted temperature is about to exceed 60°C or fall below 50°C, the system will automatically adjust the input voltage or current to ensure temperature stability. The adjustment rule is based on the PID control algorithm.

[0011] The present invention provides a method for preparing a flexible electronic heating film based on carbon black reinforcement, comprising:

[0012] Step S1: After aliphatic diisocyanate and platinum-catalyzed silicone are mixed and stirred at a volume ratio of 1:1 for 45 minutes to obtain a polymer, a film is coated on an acrylic plate to ensure that the film thickness is 0.5 cm ± 0.1 cm, and then placed in an electric heating blast drying oven at 70° C. for 4 hours to obtain a polymer film;

[0013] Step S2: aliphatic diisocyanate, platinum-catalyzed silicone and N660 carbon black powder are mixed in a volume ratio of 1:1:2 and stirred thoroughly, and then coated on an acrylic plate to ensure that the film thickness is 0.5 cm±0.1 cm, and then placed in an electric heating blast drying oven at 70° C. for 4 hours to obtain a carbon black conductive film;

[0014] Step S3: assembling the polymer film and the carbon black conductive film together to obtain a carbon black conductive composite film;

[0015] Step S4: Connecting wires to both ends of the carbon black conductive composite film for packaging to obtain a flexible electronic heating film reinforced with carbon black.

[0016] Beneficial effects:

[0017] 1. The present invention forms a flexible electronic heating film based on carbon black reinforcement through a polymer film and a carbon black conductive film. The flexible electronic heating film has excellent mechanical properties, including high elasticity, toughness and wear resistance, and is suitable for application scenarios that require bending, stretching or extrusion. It can be more tightly and accurately covered on the surface of the semiconductor device, thereby improving the heat exchange efficiency and temperature control accuracy of the semiconductor device. At the same time, due to the presence of silicon-oxygen bonds in the flexible electronic heating film based on carbon black reinforcement, as well as the hybrid structure of the polyurethane chain and the silicone chain, the heat resistance of the film is guaranteed, and the silicon ester compound in the flexible electronic heating film based on carbon black reinforcement has good tolerance to many chemical substances, so it can perform well in various chemical environments, so that the flexible electronic heating film based on carbon black reinforcement can be used in more severe environments and has a longer life. In addition, the carbon black agglomerates in the flexible electronic heating film based on carbon black reinforcement form a carbon black network, which has excellent electrical and thermal conductivity. The maximum heating temperature can reach about 60°C at a voltage of 32V, that is, the film has excellent heating performance.

[0018] 2. The present invention also introduces a long short-term memory network model to predict the temperature change trend of the heating film. By modeling and learning historical temperature data and current environmental parameters, it can accurately predict future temperature changes. Combined with the time series prediction capability of LSTM, the power output of the heating film can be adjusted in real time to prevent the temperature from being too high or insufficient, effectively improve the temperature control accuracy, and reduce energy consumption. At the same time, based on the prediction results of the LSTM model, combined with the PID control algorithm, the temperature of the film can be adjusted in real time during the operation process. Through the feedback adjustment of the controller, the film temperature is ensured to always be maintained within the target range (50℃~60℃), avoiding temperature overshoot or fluctuation, and further improving the safety and stability of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is to prepare a flexible electronic heating film based on carbon black reinforcement.

[0020] Figure 2 Characterization of carbon black conductive film under electron optical microscope

[0021] Figure 3 This is the actual temperature change curve of the carbon black conductive composite film at 32V.

[0022] Figure 4 It is the temperature change curve predicted by the trained long short-term memory network model.

[0023] Figure 5 It is a comparison chart of the temperature change curve predicted by the trained long short-term memory network model and the real-time temperature adjustment curve after the introduction of the PID control algorithm, and the actual temperature change curve. DETAILED DESCRIPTION

[0024] The present invention will be further explained below in conjunction with the accompanying drawings.

[0025] like Figure 1 As shown, the present invention provides a flexible electronic heating film based on carbon black reinforcement, comprising: a polymer film and a carbon black conductive film;

[0026] The carbon black conductive film is arranged on the polymer film, and the carbon black conductive film has carbon black agglomerates formed by carbon black powder inside to form a three-dimensional network structure distribution, and wires are connected to both sides of the carbon black conductive film.

[0027] In this embodiment, the film thickness of the polymer film and the carbon black conductive film are both 0.5cm±0.1cm, so that the heat can be more evenly conducted and the heating performance can be improved. The thickness within this range can ensure that the film has a certain flexibility and can withstand mechanical stress, thereby extending the service life. The wire material can be aluminum (Al), gold (Au), copper (Cu), silver (Ag), etc. The power supply for the wire is preferably a low-voltage power supply, about 30V, and its main characteristics are low energy consumption and good heating effect.

[0028] The electrical and thermal conduction principles of the flexible electronic heating film reinforced with carbon black are as follows:

[0029] Carbon black powder forms carbon black agglomerates to form a three-dimensional network structure in the polymer matrix of the carbon black conductive film. The three-dimensional network structure is continuous, which will help improve the thermal conductivity and electrical conductivity of the organic polymer matrix. Therefore, electrons can be conducted through the carbon black network, that is, there is resistance in the film. According to Joule's law, the film will generate a certain amount of heat.

[0030] like Figure 2 As shown, it can be seen that the carbon black filler particles have been integrated into the polymer film. A large number of carbon black filler particles are covered on the polymer matrix. The carbon black filler particles in the figure are composed of carbon black agglomerates. Carbon black agglomerates refer to the agglomeration phenomenon of carbon black aggregates formed in organic polymer liquids. Existing data show that carbon black aggregates are composed of 10 to 100 spherical carbon black particles, with a maximum size of about 100nm and a very stable structure.

[0031] like Figure 3 As shown, the actual temperature change curve of the flexible electronic heating film reinforced with carbon black at 32V is demonstrated.

[0032] The present invention also provides a method for preparing a flexible electronic heating film based on carbon black reinforcement, comprising:

[0033] Step S1: After aliphatic diisocyanate and platinum-catalyzed silicone are mixed and stirred at a volume ratio of 1:1 for 45 minutes to obtain a polymer, a film is coated on an acrylic plate to ensure that the film thickness is 0.5 cm ± 0.1 cm, and then placed in an electric heating blast drying oven at 70° C. for 4 hours to obtain a polymer film;

[0034] Step S2: aliphatic diisocyanate, platinum-catalyzed silicone and N660 carbon black powder are mixed in a volume ratio of 1:1:2 and stirred thoroughly, and then coated on an acrylic plate to ensure that the film thickness is 0.5 cm±0.1 cm, and then placed in an electric heating blast drying oven at 70° C. for 4 hours to obtain a carbon black conductive film;

[0035] Step S3: assembling the polymer film and the carbon black conductive film together to obtain a carbon black conductive composite film;

[0036] Step S4: Connecting wires to both ends of the carbon black conductive composite film for packaging to obtain a flexible electronic heating film reinforced with carbon black.

[0037] In this embodiment, when preparing the carbon black conductive film, the composite is continuously stirred, so the organic polymer and the carbon black undergo many repeated shearing actions, and finally carbon black agglomerates are formed. However, the carbon black agglomerates will not be very large and will not affect their own existence. Moreover, there is a stable interface effect between the carbon black and the organic polymer matrix, so the carbon black agglomerates can stably exist in the organic polymer matrix.

[0038] The temperature adjustment method of carbon black conductive film is:

[0039] Step 1: Collect the temperature change data of the film under different environments, establish a data set, and train the long short-term memory network model so that the trained long short-term memory network model can accurately predict the future temperature change of the film and ensure that the film does not exceed the preset temperature range during operation. The error between the predicted temperature and the actual measured temperature can be evaluated by the mean square error;

[0040] Step 2: Collect the temperature data of the film in real time and use the trained long short-term memory network model for prediction, where the input of the model is the past temperature series data and the output is the temperature prediction value for the next few time steps;

[0041] Step 3: Based on the temperature change curve predicted by the trained long short-term memory network model, when the predicted temperature is about to exceed 60°C or fall below 50°C, the system will automatically adjust the input voltage or current to ensure temperature stability. The adjustment rule is based on the PID control algorithm.

[0042] Figure 4This is the temperature change curve predicted by the trained long short-term memory network model. It can be seen that the temperature change trend predicted by the trained LSTM is highly consistent with the actual data, which shows that the trained LSTM model can effectively capture the pattern of temperature change and is used to predict future temperatures.

[0043] Figure 5 It is a comparison chart of the temperature change curve predicted by the trained LSTM model and the real-time temperature adjustment curve after the introduction of the PID control algorithm, and the actual temperature change curve. This chart clearly shows how PID control adjusts the temperature through feedback to avoid excessive or insufficient temperature and ensure that the temperature is maintained within the ideal range.

[0044] The present invention forms a flexible electronic heating film based on carbon black reinforcement through a polymer film and a carbon black conductive film. The flexible electronic heating film has excellent mechanical properties, including high elasticity, toughness and wear resistance, and is suitable for application scenarios that require bending, stretching or extrusion. It can be more tightly and accurately covered on the surface of the semiconductor device, thereby improving the heat exchange efficiency and temperature control accuracy of the semiconductor device. At the same time, due to the presence of silicon-oxygen bonds in the flexible electronic heating film based on carbon black reinforcement, as well as the hybrid structure of the polyurethane chain and the silicone chain, the heat resistance of the film is guaranteed, and the silicon ester compound in the flexible electronic heating film based on carbon black reinforcement has good tolerance to many chemical substances, so it can perform well in various chemical environments, so that the flexible electronic heating film based on carbon black reinforcement can be used in more severe environments and has a longer life. In addition, the carbon black agglomerates in the flexible electronic heating film based on carbon black reinforcement form a carbon black network, which has excellent electrical and thermal conductivity. The maximum heating temperature can reach about 60°C at a voltage of 32V, that is, the film has excellent heating performance.

[0045] During use, the present invention predicts the temperature at several future time points by inputting historical temperature data through the trained LSTM model, and adjusts the input voltage or current in real time according to the prediction results, and then uses PID control to ensure that the heating temperature of the film is maintained between the ideal 50°C and 60°C.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A flexible electronic heating film based on carbon black reinforcement, characterized in that: include: Polymer films and carbon black conductive films; The carbon black conductive film is arranged on the polymer film, and the carbon black agglomerates formed by carbon black powder inside the carbon black conductive film are distributed in a three-dimensional network structure, and wires are connected to both sides of the carbon black conductive film.

2. The carbon black reinforced flexible electronic heating film according to claim 1, characterized in that: The film thickness of the polymer film and the carbon black conductive film are both 0.5 cm±0.1 cm.

3. The carbon black reinforced flexible electronic heating film according to claim 1, characterized in that: The temperature adjustment method of the carbon black conductive film is as follows: Step 1: Collect the temperature change data of the film under different environments, establish a data set, and train the long short-term memory network model so that the trained long short-term memory network model can accurately predict the future temperature change of the film and ensure that the film does not exceed the preset temperature range during operation. The error between the predicted temperature and the actual measured temperature can be evaluated by the mean square error; Step 2: Collect the temperature data of the film in real time and use the trained long short-term memory network model for prediction, where the input of the model is the past temperature series data and the output is the temperature prediction value for the next few time steps; Step 3: Based on the temperature change curve predicted by the trained long short-term memory network model, when the predicted temperature is about to exceed 60°C or fall below 50°C, the system will automatically adjust the input voltage or current to ensure temperature stability. The adjustment rule is based on the PID control algorithm.

4. A method for preparing a flexible electronic heating film based on carbon black reinforcement, characterized in that: include: Step S1: After aliphatic diisocyanate and platinum-catalyzed silicone are mixed and stirred at a volume ratio of 1:1 for 45 minutes to obtain a polymer, a film is coated on an acrylic plate to ensure that the film thickness is 0.5 cm ± 0.1 cm, and then placed in an electric heating blast drying oven at 70° C. for 4 hours to obtain a polymer film; Step S2: aliphatic diisocyanate, platinum-catalyzed silicone and N660 carbon black powder are mixed in a volume ratio of 1:1:2 and stirred thoroughly, and then coated on an acrylic plate to ensure that the film thickness is 0.5 cm±0.1 cm, and then placed in an electric heating blast drying oven at 70° C. for 4 hours to obtain a carbon black conductive film; Step S3: assembling the polymer film and the carbon black conductive film together to obtain a carbon black conductive composite film; Step S4: Connecting wires to both ends of the carbon black conductive composite film for packaging to obtain a flexible electronic heating film reinforced with carbon black.

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