Method for improving dielectric constant of polypropylene film

A polypropylene film, high dielectric constant technology, applied in chemical instruments and methods, fibrous fillers, dyeing physical treatment, etc. problems, to achieve the effect of improving interface compatibility, increasing dielectric constant, and multi-contact area

Active Publication Date: 2020-09-01
STATE GRID CORP OF CHINA +1
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AI-Extracted Technical Summary

Problems solved by technology

[0005] The present invention proposes a method for improving the dielectric constant of polypropylene film to solve the problem of agglomeration easily occurring in the prior art when fillers with high dielectric constant...
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Method used

Described pre-dispersion treatment is: be 65-90 ℃ at temperature, magnetic stirring disperses 1-10min under the condition that power is 250-700W; The composite filler of spheroidization high dielectric constant after surface treatment is carried out pre-treatment Dispersion treatment can effectively improve the interfacial compatibility between the spheroidized composite filler and polypropylene, so that the spheroidized composite filler with high dielectric constant has better dispersion in polypropylene and avoids the problem of agglomeration ;
From the data records of table 1, it can be seen that the application is made of porcelain particles, barium titanate, carbon nanotubes, and titanium dioxide as composite fillers, and there is a synergistic effect between the components of composite utilization, which has better interaction force , can be neatly arranged in the polypropylene body and form a good overlap with each other. From the comparison of Comparative Example 3 and Example 4, it can be seen that a single component is difficult to reach the technical effect of the present application; Comparative Example 1 and Example 4 The comparison shows that the addition of spheroidized high dielectric constant composite fillers in the preparation of polypropylene can effectively improve the dielectric constant of polypropylene films, and the breakdown field strength is greater than 430KV/mm, and the dielectric loss is less than 10-4; from the comparative example 2. Comparative analysis with Example 4 shows that: the composite filler with high dielectric constant is spheroidized to obtain a spheroidized high dielectric constant composite filler with an average particle diameter of 95-270nm and an average pore diameter of 350-650nm. Reduce the probability of the composite filler forming a conductive channel in the polypropylene film and promote the dielectric constant of the polypropylene film; and the spheroidized high dielectric constant composite filler is surface-treated, pre-dispersed and then added to the polypropylene to form The system helps to improve the dielectric constant of the polypropylene film; by contrasting Example 4 and Comparative Example 5 with Example 4 respectively, it can be seen that: in the present application, the composite filler of spherical high dielectric constant is subjected to surface treatment and pretreatment can It can effectively improve the interfacial compatibility between the spheroidized composite filler and polypropylene, so that the spheroidized high dielectric constant composite filler has better dispersion in polypropylene and avoids the problem of agglomeration; Comparing ratio 6 with Example 4, it can be seen that after adding the coupling agent, setting the ultrasonic vibration can further reduce the probability of agglomeration of the mixed system of spherical high dielectric constant composite filler and polypropylene, which helps to improve the dielectric strength of the polypropylene film. constant.
In addition, described surface treatment is: add surface treatment agent in the composite filler of spheroidization high dielectric constant, stir 10-25min under the stirring speed of 100-250r/min, leave standstill; In the present embodiment Among them, the surface treatment agent is one or more of silane coupling agent, stearic acid, fatty acid and aminosilane; the composite filler with spheroidized high dielectric constant has a larger specific surface area, and the surface treatment can While enhancing its mechanical properties, it can further provide a transition layer for the combination between the spheroidized high dielectric constant composit...
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Abstract

The invention provides a method for improving the dielectric constant of a polypropylene film. The method comprises the following steps of: putting a composite filler with a high dielectric constant into a spheroidizing device into which a direct-current arc plasma flame flow is introduced, and spheroidizing under the action of surface tension to obtain a spheroidized high-dielectric-constant composite filler with the average particle size of 95-270nm and the average pore size of 350-650nm; and carrying out surface treatment and pre-dispersion treatment on the spheroidized high-dielectric-constant composite filler under the assistance of microwaves, and adding the filler to the polypropylene film preparation process. The problem of easy agglomeration of the filler can be solved on the premise of the guaranteeing of the mechanical property of the polypropylene film, the dielectric constant of the polypropylene film can be improved, the dielectric loss is low, the breakdown field intensity is more than 430 KV/mm, and better application reliability can be obtained in the actual application.

Application Domain

Pigment treatment with organosilicon compoundsPigment physical treatment +1

Technology Topic

Thin membraneDielectric loss +8

Image

  • Method for improving dielectric constant of polypropylene film
  • Method for improving dielectric constant of polypropylene film
  • Method for improving dielectric constant of polypropylene film

Examples

  • Experimental program(4)
  • Comparison scheme(6)
  • Effect test(1)

Example Embodiment

[0032] Example 1:
[0033] In this embodiment, a method for increasing the dielectric constant of a polypropylene film is provided, and the method includes the following steps:
[0034] S1 puts the high-dielectric constant composite filler in a spheroidizing device that is passed into a DC arc plasma flame flow, and spheroidizes under the action of surface tension to obtain an average particle size of 95-270nm and an average pore diameter of 350- 650nm spheroidized high dielectric constant composite filler, and the temperature in the spheroidizing device is 45-200°C; the high dielectric constant composite filler includes a volume ratio of 1-4:1-2:2 -7: 1-4 ceramic particles, barium titanate, carbon nanotubes, titanium dioxide; compounding a specific proportion of high dielectric constant components not only plays a role in synergistically increasing the dielectric constant of polypropylene film, but also ensures The mechanical properties of the polypropylene film reduce the dielectric loss, and the compound components are processed by the spheroidization process to obtain a spheroidized high-dielectric constant composite filler with a certain particle size and pore size, which is helpful for the subsequent process. It forms a better descriptive system with polypropylene; in addition, the spheroidizing device using DC arc plasma flame flow here includes a DC arc plasma generator, a reactor, a spheroidizing gasifier, and an air-cooled water-cooled quench The structure of the DC arc plasma generator includes: cathode, auxiliary anode, arc column and main anode, main anode and auxiliary anode, as well as cyclone separator and bag dust collector below the aggregate cone Insulators with good insulation properties at high temperatures are used for insulation. During operation, inert gas is introduced to protect the cathode from electrode protection gas, and inert gas or air is tangentially rotated into the main gas chamber from the main gas inlet to stabilize the normal combustion of the arc, and The composite filler can be cooled and spheroidized in a controllable manner through more than airflow nozzles;
[0035] S2 After surface treatment and pre-dispersion treatment of the spheroidized high dielectric constant composite filler under the assist of microwave, it is added to the process of preparing polypropylene film to increase the dielectric constant of the polypropylene film, and In this embodiment, the conditions of the microwave assisting effect are: the microwave frequency is 1.0-5.0Ghz, the microwave power is 0.5-2.0KW; the spheroidized high-permittivity composite filler is assisted by the microwave, under uniform heating Under the action, the thermal gradient in the spheroidized high-permittivity composite filler is eliminated, and the surface treatment and pre-dispersion treatment effect of the spheroidized high-permittivity composite filler are promoted. The dispersion uniformity of the composite filler in the polypropylene system reduces the probability of agglomeration;
[0036] In addition, the surface treatment is: adding a surface treatment agent to the spheroidized high-dielectric constant composite filler, stirring at a stirring speed of 100-250r/min for 10-25min, and standing; in this embodiment, The surface treatment agent is one or more of silane coupling agent, stearic acid, fatty acid and amino silane; the spheroidized high dielectric constant composite filler has a large specific surface area, and its mechanics can be enhanced by surface treatment The performance can further provide a transition layer between the spheroidized high-dielectric constant composite filler and polypropylene, which is beneficial to reduce the dielectric loss of the system;
[0037] The pre-dispersion treatment is: magnetic stirring and dispersion for 1-10 min under the conditions of a temperature of 65-90°C and a power of 250-700W; pre-dispersing the spheroidized composite filler with high dielectric constant after surface treatment, It can effectively improve the interface compatibility between the spheroidized composite filler and polypropylene, so that the spheroidized composite filler with high dielectric constant has better dispersibility in polypropylene and avoids the problem of agglomeration;
[0038] S3. Add coupling agent to the mixed system of spheroidized high-dielectric constant composite filler and polypropylene after pre-dispersion treatment, and stir for 1-3h under ultrasonic vibration conditions to obtain a fully coupled mixture A , And the frequency of the ultrasonic oscillation is 20-45 Hz; and in the mixed system, the weight parts of the high dielectric constant composite filler and polypropylene are: high dielectric constant composite filler 1-25 Parts, 95-140 parts of polypropylene; the coupling agent uses 96% mass concentration of 3-aminopropyl triethoxysilane solution or 95% mass concentration of (3-mercaptopropyl) trimethoxy Silane solution
[0039] S4. Disperse the mixture A to obtain a uniformly dispersed mixture B; disperse the mixture A before molding to ensure that the system of spheroidized high-dielectric constant composite filler and polypropylene has better molding before molding. The condition is to ensure the uniform dispersion of the whole system.
[0040] S5. After the mixture B is defoamed, it is placed in a vacuum hot press for hot pressing to obtain a polypropylene film, and the hot pressing conditions are: 80°C-220°C, the pressure is 10MPa, and the pressure holding time is 2min .

Example Embodiment

[0041] Example 2:
[0042] This embodiment should be understood to include all the features of the foregoing embodiment and further optimize on the basis of it. Therefore, this embodiment provides a method for increasing the dielectric constant of a polypropylene film. The method includes the following steps:
[0043] S1 puts the high-dielectric constant composite filler in a spheroidizing device with a direct current arc plasma flame flow, and spheroidizes under the action of surface tension to obtain a spheroidized with an average particle diameter of 95nm and an average pore diameter of 350nm Compound filler with high dielectric constant;
[0044] S2 After surface treatment and pre-dispersion treatment of the spheroidized high dielectric constant composite filler under the assist of microwave, it is added to the process of preparing polypropylene film to increase the dielectric constant of the polypropylene film, and In this embodiment, the high dielectric constant composite filler includes ceramic particles, barium titanate, carbon nanotubes, and titanium dioxide in a volume ratio of 1:1:2:1; the conditions for the microwave assisting effect are: microwave frequency 1.0Ghz, microwave power 0.5KW;
[0045] In addition, the surface treatment is: adding a surface treatment agent to the spheroidized high-dielectric constant composite filler, stirring at a stirring speed of 100r/min for 10 minutes, and standing; in this embodiment, the surface treatment agent One or more of silane coupling agent, stearic acid, fatty acid and aminosilane;
[0046] The pre-dispersion treatment is: magnetic stirring and dispersion for 10 minutes under the conditions of a temperature of 65°C and a power of 250W;
[0047] S3. Add a coupling agent to the mixed system of the pre-dispersed spheroidized high-dielectric constant composite filler and polypropylene, and stir under ultrasonic vibration for 3 hours to obtain a fully coupled mixture A, and The frequency of the ultrasonic oscillation is 45 Hz; and in the mixed system, the weight parts of the high dielectric constant composite filler and polypropylene are: 1 part of high dielectric constant composite filler and 140 parts of polypropylene ; The coupling agent uses a 96% mass concentration of 3-aminopropyl triethoxysilane solution;
[0048] S4. Disperse the mixture A to obtain a uniformly dispersed mixture B;
[0049] S5. After the mixture B is defoamed, it is placed in a vacuum hot press for hot pressing to obtain a polypropylene film, and the hot pressing conditions are: 80° C., pressure of 10 MPa, and pressure holding time of 2 min.

Example Embodiment

[0050] Example 3:
[0051] This embodiment should be understood as including all the features of any of the foregoing embodiments and further optimized on the basis of it. Therefore, in this embodiment, a method for increasing the dielectric constant of a polypropylene film is provided. The method includes The following steps:
[0052] S1 heats the high-permittivity composite filler in a spheroidizing device with a direct current arc plasma flame flow, and spheroidizes under the action of surface tension to obtain spheres with an average particle diameter of 270nm and an average pore diameter of 650nm The high dielectric constant composite filler, and the heating temperature is 200°C; the high dielectric constant composite filler includes ceramic particles, barium titanate, carbon nanotubes, and titanium dioxide in a volume ratio of 4:1:7:4 ;
[0053] S2 After surface treatment and pre-dispersion treatment of the spheroidized high dielectric constant composite filler under the assist of microwave, it is added to the process of preparing polypropylene film to increase the dielectric constant of the polypropylene film, and In this embodiment, the conditions of the microwave assisting effect are: the microwave frequency is 5.0Ghz, and the microwave power is 2.0KW;
[0054] In addition, the surface treatment is: adding a surface treatment agent to the spheroidized high-dielectric constant composite filler, stirring at a stirring speed of 250r/min for 25 minutes, and standing; in this embodiment, the surface treatment agent One or more of silane coupling agent, stearic acid, fatty acid and aminosilane;
[0055] The pre-dispersion treatment is: magnetic stirring and dispersion for 10 minutes under the conditions of a temperature of 90°C and a power of 700W;
[0056] S3. Add a coupling agent to the mixed system of the pre-dispersed spheroidized high-dielectric constant composite filler and polypropylene, and stir under ultrasonic vibration for 3 hours to obtain a fully coupled mixture A, and The frequency of the ultrasonic oscillation is 45 Hz; and in the mixed system, the weight parts of the high dielectric constant composite filler and polypropylene are: 25 parts of high dielectric constant composite filler and 40 parts of polypropylene ; The coupling agent uses a 95% mass concentration (3-mercaptopropyl) trimethoxysilane solution;
[0057] S4. Disperse the mixture A to obtain a uniformly dispersed mixture B; disperse the mixture A before molding to ensure that the system of spheroidized high-dielectric constant composite filler and polypropylene has better molding before molding. The condition is to ensure the uniform dispersion of the whole system.
[0058] S5. After the mixture B is defoamed, it is placed in a vacuum hot press for hot pressing to obtain a polypropylene film, and the hot pressing conditions are 220° C., the pressure is 10 MPa, and the pressure holding time is 2 min.

PUM

PropertyMeasurementUnit
The average particle size95.0nm
Average pore size350.0nm
The average particle size270.0nm

Description & Claims & Application Information

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