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CN-122026038-A - Microwave dielectric filter based on agarose-epoxy resin composite system and preparation method thereof

CN122026038ACN 122026038 ACN122026038 ACN 122026038ACN-122026038-A

Abstract

A microwave dielectric filter based on agarose-epoxy resin composite system is prepared through preparing deionized water, disperser, pH regulator and surface modifier into premixed liquid, ball grinding to obtain premixed liquid, adding microwave dielectric ceramic powder to the premixed liquid to obtain slurry, ball grinding to obtain microwave dielectric ceramic slurry, preparing gel from deionized water, agarose powder and epoxy resin, heating, dissolving, mixing to obtain agarose-epoxy resin composite gel, heating, stirring, vacuum defoaming, pouring in microwave dielectric ceramic filter mould, cooling, drying, demoulding to obtain blank, sintering in constant-temp constant-humidity box, polishing and grinding to obtain microwave dielectric filter based on agarose-epoxy resin composite system, and full-process green manufacture.

Inventors

  • YAO QING
  • NI JIN
  • LI HAIYAN

Assignees

  • 南通大学

Dates

Publication Date
20260512
Application Date
20260214

Claims (10)

  1. 1. The preparation method of the microwave dielectric filter based on the agarose-epoxy resin composite system is characterized by comprising the following steps of: Firstly, weighing a premix material, namely weighing 85-90 parts of deionized water, 2-5 parts of a dispersing agent, 2-5 parts of a pH regulator and 2-5 parts of a surface modifier according to the mass part ratio; secondly, placing the premix material into a ball milling tank for ball milling at the ball milling rotating speed of 400-600 r/min and the ball milling time of 2-5 min until the premix material is fully mixed to obtain a prepared premix for preparing slurry; Thirdly, adding 9-11 parts of microwave dielectric ceramic powder into the premix liquid in 4 batches to obtain slurry; fourthly, placing the slurry on a ball mill for ball milling, and preparing microwave medium ceramic slurry after passing through a mesh screen; weighing 90-95 parts of deionized water, 1-4 parts of agarose powder and 2-5 parts of epoxy resin according to the mass part ratio; Heating, dissolving and mixing the gel material on a magnetic stirrer until the material is fully dissolved to obtain agarose-epoxy resin composite gel; Mixing 65 parts of microwave dielectric ceramic slurry with 10.4-10.5 parts of agarose-epoxy resin composite gel according to the mass part ratio, and placing the mixture on a magnetic stirrer for heating and stirring to obtain the microwave dielectric ceramic slurry for gel casting; Eighth step, the microwave dielectric ceramic slurry for gel casting is injected into a microwave dielectric ceramic filter die after the vacuum bubble removal; Ninth, placing the microwave dielectric ceramic filter mould injected with the ceramic slurry in a constant temperature and humidity box, cooling and drying, and removing the mould after drying is finished to obtain a biscuit; and tenth, placing the demolded biscuit in a sintering furnace for glue discharging and sintering, and polishing and grinding after vacuum sintering to obtain the microwave dielectric filter based on the agarose-epoxy resin composite system.
  2. 2. The preparation method of the microwave dielectric filter based on the agarose-epoxy resin composite system according to claim 1, wherein the dispersing agent in the first step is one or more of polyacrylic acid, ammonium polyacrylate and ammonium citrate, the pH regulator is an alkaline regulator, the surface modifier is polyethylene glycol, and the pH regulator regulates the pH of the premix material to 9-11.
  3. 3. The method for preparing the microwave dielectric filter based on the agarose-epoxy resin composite system according to claim 1, wherein in the third step, the microwave dielectric ceramic powder is added into the premix liquid in 4 batches, wherein 3.5-4 parts are added for the first time, 2-2.5 parts are added for the second time, 2-2.5 parts are added for the third time, 1.5-2 parts are added for the fourth time, and the time interval is 1.8-2.3 hours.
  4. 4. The method for preparing the microwave dielectric filter based on the agarose-epoxy resin composite system according to claim 1, wherein the ball milling speed in the fourth step is 300-800 r/min, the ball milling time is 8-10 h, and the mesh screen is 50-200 meshes.
  5. 5. The preparation method of the microwave dielectric filter based on the agarose-epoxy resin composite system according to claim 1, wherein the heating temperature in the sixth step is 80-90 ℃, the magnetic stirring rotating speed is 100-150 r/min, and the stirring time is 5-10 min.
  6. 6. The preparation method of the microwave dielectric filter based on the agarose-epoxy resin composite system according to claim 1, wherein the heating temperature in the seventh step is 80-90 ℃, the magnetic stirring rotating speed is 300-500 r/min, and the stirring time is 10-30 min.
  7. 7. The preparation method of the microwave dielectric filter based on the agarose-epoxy resin composite system, which is characterized in that the microwave dielectric ceramic filter in the eighth step is made of one or more of silica gel, resin and soft gel, and the vacuum degree in the vacuum defoaming is-10 Kpa to-20 Kpa.
  8. 8. The preparation method of the microwave dielectric filter based on the agarose-epoxy resin composite system, which is characterized in that the temperature of the constant temperature and humidity box in the ninth step is 20-40 ℃, the humidity is 60-70%, and the drying time is 10-15 h.
  9. 9. The method for preparing the microwave dielectric filter based on the agarose-epoxy resin composite system according to claim 1, wherein the heating rate of the gel discharging stage in the tenth step is 1 ℃ per minute, the heating rate of the sintering stage is 2 ℃ per minute, and the sintering temperature is 1300 ℃ to 1400 ℃.
  10. 10. A microwave dielectric filter based on an agarose-epoxy composite system prepared by the method of any one of claims 1-9.

Description

Microwave dielectric filter based on agarose-epoxy resin composite system and preparation method thereof Technical Field The invention belongs to the technical field of microwave dielectric ceramic filter forming and manufacturing processes, and particularly relates to a microwave dielectric filter based on an agarose-epoxy resin composite system and a preparation method thereof. Background The microwave dielectric ceramic is applied to microwave frequency band circuits, is used as a dielectric material and realizes one or more functions, the dielectric property is mainly measured by dielectric constant (epsilon r), quality factor (Q x f) and resonant frequency temperature coefficient (tau f), the characteristics of low epsilon r, high Q x f and near zero tau f lead the microwave dielectric ceramic to be widely applied to microwave communication devices, a ceramic filter is an indispensable electronic device of a 5G communication technology, and the forming method at the present stage mainly comprises a dry pressing method, 3D printing and gel casting, wherein the dry pressing method has the advantages of easy control of reaction, simple operation and capability of forming complex structures with clean dimensions, although the dry pressing method has high precision, quick forming and wide application to industrial production, but is limited by high mould cost and uneven product density, the 3D printing can realize the rapid design and production of devices but faces the problems of little adaptation material, difficult post treatment of closed structure cavities, and the like. Agarose is environment-friendly and easy to obtain, and is widely used in gel casting, and patent document CN105835209A discloses a ceramic gel casting molding method based on agarose, wherein agarose solution is proportionally injected into ceramic slurry which is subjected to vacuum defoaming and preheating, and then is injected into a preheated die together to be cooled to obtain a blank body. The ceramic prepared by using agarose as a gel has certain strength and can be processed later. Patent document CN111592341B discloses a preparation method of porous alumina ceramic, which comprises uniformly mixing alumina powder, magnesia, agarose and ceramic pore-forming agent, preparing slurry, heating the obtained slurry to 80 ℃, injecting into a mold, and naturally cooling to room temperature to obtain a molded sample. The above patents all use agarose as a gel to prepare ceramics, but all use a single gel system (agarose gel system), and the obtained sample has certain strength, but cannot meet the working condition environment required by the use of microwave dielectric ceramics. In order to solve the problem of low strength of ceramic prepared by single agarose, patent document CN119306470A discloses a preparation method of a basalt fiber SiO 2 aerogel composite heat insulation material, wherein a composite binder system silica sol-agarose system is adopted to bond basalt short fibers, so that the mechanical property of the composite material is improved. The microwave dielectric ceramics have complex working conditions and various environments, so that the microwave dielectric ceramics need higher strength and better bending strength. Through experiments and reading patent documents, the strength of the microwave dielectric ceramic filter prepared by taking agarose as a gel is difficult to meet the requirement of the use condition. Therefore, in order to meet the use requirement, the problem of low strength of the microwave dielectric ceramic filter prepared by a single agarose gel system needs to be solved. Through intensive research, the current literature and patent numbers about improving the strength of the agarose preparation microwave dielectric ceramic filter are not large. Essentially focusing on research of agarose as a gel and research on the characteristics of agarose per se, lack of research on the overall formulation of a microwave dielectric ceramic filter for improving the strength of agarose preparation provides new directions and points of entry for subsequent research. Disclosure of Invention The invention provides a microwave dielectric filter based on an agarose-epoxy resin composite system and a preparation method thereof, which aim to solve the core technical problems of insufficient gel strength, long gel time, low production efficiency and the like in the prior art. In order to achieve the above purpose, the present application is realized by the following technical scheme: the preparation method of the microwave dielectric filter based on the agarose-epoxy resin composite system specifically comprises the following steps: Firstly, weighing a premix material, namely weighing 85-90 parts of deionized water, 2-5 parts of a dispersing agent, 2-5 parts of a pH regulator and 2-5 parts of a surface modifier according to the mass part ratio; secondly, placing the premix material into a ball milling tank for ball mi