CN110938311A - Low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet, preparation method and equipment - Google Patents
Low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet, preparation method and equipment Download PDFInfo
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Abstract
The invention discloses a low-density flexible high-heat-conductivity wave-absorbing silica gel sheet which is characterized by being prepared from the following components in parts by weight: vinyl silicone oil: 100, respectively; silicone resin: 10-30 parts of; raw rubber: 60-80 parts; a crosslinking agent: 5-10; 1000 portions of low-density filler and 1500 portions; wave-absorbing filler: 80-100 parts, including: 75-95 parts of barium ferrite coated hollow glass beads and 5-25 parts of magnetic multilayer carbon nanotubes; catalyst: 0.1-0.5; inhibitor (B): 0.1-0.2; wherein the low-density filler is one of alumina, magnesia, boron nitride, aluminum nitride and beryllium oxide or a mixture of the alumina, the magnesia, the boron nitride, the aluminum nitride and the beryllium oxide. The invention also discloses a preparation method and equipment thereof. The low-density flexible high-heat-conduction wave-absorbing silica gel sheet, the preparation method and the equipment provided by the invention have the advantages that the materials, the process and the equipment are synchronously improved, so that the materials have the functions of low density, flexibility, high heat conduction and wave absorption, and the production process and the equipment are simplified.
Description
Technical Field
The invention relates to the technical field of high-heat-conductivity wave-absorbing silica gel sheets, in particular to a low-density flexible high-heat-conductivity wave-absorbing silica gel sheet, a preparation method and equipment.
Background
The heat-conducting silica gel sheet has excellent heat-conducting property and electrical insulating property, can meet the heat-conducting and insulating requirements of most electronic products, is specially manufactured by a design scheme of utilizing gaps to transfer heat, can fill the gaps, effectively transfers the heat of a heating part to the radiator, the silicone sheet is placed between the heating device and the radiating component to achieve good contact and heat transfer and insulation effects by utilizing the characteristics of stable heat conduction and insulation performance, softness, high elasticity and the like of a soft silicone heat conduction material, and is particularly applied to LED lamp decorations, lighting equipment, household appliances, LCD displays, semiconductors and radiating fins, communication products, smart phones, tablet computers, desktop computers, laptop computers and other portable computers, high-power supplies and the like.
The heat-conducting silica gel gasket has certain flexibility, self-adhesion and better compressibility, can effectively reduce contact resistance, guide heat transfer between a heating part and a radiating part, and has the characteristics of excellent high and low temperature resistance, weather resistance, insulation or high impact voltage resistance and the like, so that the heat-conducting silica gel gasket is widely applied to the heat-conducting field of electronic and electrical appliances. With the development of the electronic industry, high-technology technologies such as electronic components, large-scale integrated circuit boards, LEDs and the like tend to be more intensive and miniaturized, and the requirements on the performances such as light weight, high heat conductivity, high elasticity and the like are more and more severe. Therefore, the demand for new heat conductive silica gel gaskets is also increasing year by year.
In recent years, new energy automobiles such as electric automobiles and the like become a new trend of the future automobile industry due to the advantages of no pollution, low noise, high energy efficiency, diversification, simple structure, convenience in maintenance and the like. Particularly, electric automobiles in China have been in the industrialization stage from the research and development stage initially through the process of one decade and one sword. The heat conduction of the battery is a key difficulty and an important key technology in the application of new energy automobiles. As is well known, the reduction of the weight of the automobile can effectively reduce the emission of the automobile and realize the improvement of the combustion efficiency of the automobile. The self weight of the automobile is reduced by 10 percent, and the fuel consumption can be reduced by 6 to 8 percent.
Therefore, the weight reduction of the automobile can reduce energy consumption, increase the speed of the automobile, improve safety and reduce pollution. Therefore, the battery heat conduction of the electric automobile not only needs to realize the functional characteristics of shock resistance, heat transfer and the like, but also puts higher requirements on weight, environmental protection and the like.
The patent focuses on improving the heat conduction and mechanical strength properties of the heat conduction wave-absorbing silica gel sheet. However, the flame retardant and shock absorption functions of the automobile battery can be well realized, but the heat-conducting silica gel has high quality and high density, does not have the wave absorption function, has an unobvious reduction effect on the overall weight and electromagnetic radiation of the electric automobile, and limits the application of the heat-conducting silica gel in equipment such as the electric automobile.
Meanwhile, the existing preparation method and equipment of the high-thermal-conductivity wave-absorbing silica gel sheet have the following problems:
1. the present high heat conduction inhale ripples silica gel piece's manufacturing degree of automation is low, mostly is adopting many sets of equipment to process, and the component carries out artifical ratio and detects, and the material quality to in the course of working can not accurate control, is difficult to carry out accurate detection to the material performance in the processing, leads to the quality of product unstable.
2. At present, the high-thermal-conductivity wave-absorbing silica gel sheet cannot accurately analyze and detect the performance of the silica gel sheet after production is finished, so that the physical and chemical properties of the silica gel sheet cannot be specifically mastered, and the application occasion of the silica gel sheet cannot be well adapted to the performance of the silica gel sheet.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method and equipment of a low-density flexible high-heat-conduction wave-absorbing silica gel sheet, so that the material has low-density, flexible, high-heat-conduction and wave-absorbing functions, and meanwhile, the production process and equipment are simplified, so as to solve the problems that the existing high-heat-conduction wave-absorbing silica gel sheet is lagged in proportioning and detection means, the quality and performance of the material cannot be accurately controlled, the physical and chemical properties of the silica gel sheet are not accurately detected, and the like.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme:
the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet is characterized by being prepared from the following components in parts by weight:
vinyl silicone oil: 100, respectively; silicone resin: 10-30 parts of; raw rubber: 60-80 parts; a crosslinking agent: 5-10; 1000 portions of low-density filler and 1500 portions; wave-absorbing filler: 80-100 parts, including: 75-95 parts of barium ferrite coated hollow glass beads and 5-25 parts of magnetic multilayer carbon nanotubes; catalyst: 0.1-0.5; inhibitor (B): 0.1-0.2; wherein the low-density filler is one of alumina, magnesia, boron nitride, aluminum nitride and beryllium oxide or a mixture of the alumina, the magnesia, the boron nitride, the aluminum nitride and the beryllium oxide.
A preparation method of a low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet is characterized by comprising the following steps: the method comprises the following steps:
s1: preparing raw materials: preparing vinyl silicone oil, organic silicon resin, crude rubber, a cross-linking agent, low-density filler, wave-absorbing filler, a catalyst and an inhibitor according to a set weight ratio;
s2: stirring, plasticating and mixing: putting dry materials in the raw materials into a high-speed stirrer for mixing and dispersing; after the dry materials are uniformly mixed, putting wet materials in the raw materials into the mixer and uniformly stirring the materials; continuously applying an alternating electric field in the stirring process; after all raw materials are quickly and uniformly mixed, the mixture is input into a reaction container of a vulcanization furnace, vacuumized and heated to 150-180 ℃, so that the molecular weight and viscosity of raw rubber in the mixed raw materials are reduced to improve the plasticity of the raw rubber, proper fluidity is obtained, a gel-like silica gel semi-finished product is obtained, and after color matching and mixing, milky silica gel is changed into a sheet material with a set color so as to meet the requirements of mixing, molding and further processing;
s3: detecting and vulcanizing and forming, namely detecting the wave absorbing performance of the gel-like silica gel semi-finished product in the reaction container, returning to the step S2 if the gel-like silica gel semi-finished product is unqualified, guiding the gel-like silica gel semi-finished product into a mold if the gel-like silica gel semi-finished product is qualified, pressing the gel in the mold by using a pressing mechanism to enhance the density and the smoothness of the gel-like silica gel semi-finished product, and forming a solid silica gel sheet state after the gel-like silica gel semi;
s4: trimming and cutting, namely taking the silicon gel sheet cooled into a sheet shape out of the die, and cutting the silicon gel sheet into a silicon gel finished product meeting the set requirements through transverse cutting and longitudinal cutting by a cutter;
s5: and (3) finished product detection and warehousing, conveying the cut and molded silica gel single piece or leftover material to a comprehensive test machine containing a heat conductivity coefficient detection module, a wave absorbing performance detection module, a resistivity detection module, a voltage resistance detection module, a tensile strength detection module and a hardness detection module, testing the heat conductivity coefficient, the wave absorbing performance, the temperature resistance range, the volume resistivity, the voltage resistance, the flame retardance, the tensile strength, the hardness, the thickness and the like of the finished silica gel, and warehousing qualified products.
A preparation device of a low-density flexible high-heat-conductivity wave-absorbing silica gel sheet comprises a high-speed stirrer, a vulcanizing furnace, a forming machine, a cutting machine, a detecting machine and a packaging machine, wherein the main structure of the high-speed stirrer is a conical hopper body, and an alternating electric field electromagnetic coil is arranged on the outer side of the conical hopper body; the top end of the high-speed stirrer is fixedly provided with a stirring motor through a support, the bottom end of a rotor shaft of the stirring motor is fixedly connected in series with crushing fan blades, the bottom end of the high-speed stirrer is communicated with a raw material discharge valve, an outlet of the raw material discharge valve is communicated with a feed inlet of the vulcanizing furnace, the bottom end of the vulcanizing furnace is fixedly attached with an electric heating and electric field generator, one side of the top end of the vulcanizing furnace is connected with a vacuum exhaust tube, and the bottom end of the vulcanizing furnace is communicated with a finished product discharge valve; the opening of the finished product discharge valve is positioned at the top of the head end of the forming machine, the forming machine comprises a first conveying belt, forming dies are arranged on the first conveying belt at equal intervals, lifting frames are vertically fixed on two sides of the middle part of the first conveying belt, a pressure-extending rotary roller is movably embedded in the middle part of each lifting frame, the excircle of each pressure-extending rotary roller presses the top surface of each forming die, the cutting machine is arranged on one side of the tail end of the forming machine side by side, the cutting machine comprises a second conveying belt, a first translation material taking mechanism is arranged between the tail end of the first conveying belt and the head end of the second conveying belt, a longitudinal hob and a transverse stamping knife are sequentially arranged on the middle part of the second conveying belt through a knife rest, the detection machine is arranged on the tail end of the cutting machine side by side, and a second translation material taking mechanism is arranged between the tail end of the, the tail end of the cutting machine is communicated with the packaging machine in the same direction.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method and equipment of a low-density flexible high-heat-conductivity wave-absorbing silica gel sheet, and the preparation method and equipment have the following beneficial effects:
1. the invention provides a low-density flexible high-heat-conductivity wave-absorbing silica gel sheet, a preparation method and equipment, which are characterized in that materials, processes and equipment are synchronously improved to achieve the purposes of enabling the materials to have the functions of low density, flexibility, high heat conductivity and wave absorption, and simultaneously, the production process and the equipment are simplified, so that the problems that the existing detection means of the processes of proportioning, stirring, reaction and the like of the high-heat-conductivity wave-absorbing silica gel sheet material is lagged behind, the quality and the performance of the materials cannot be accurately controlled, the physical and chemical properties of the silica gel sheet cannot be accurately detected and the like are solved.
2. According to the low-density flexible high-heat-conductivity wave-absorbing silica gel sheet provided by the invention, through a unique formula design, the material has the functions of low density, flexibility, high heat conductivity and wave absorption, and meanwhile, the real-time detection in the product preparation process can be realized. The adopted wave-absorbing filler enables the product to have a wave-absorbing function on one hand, and the second step is matched with an applied alternating electric field to accelerate the stirring speed and the uniformity; the third electronic sensor can be matched to test the performance of the material in vulcanization, and the next step is carried out after the performance reaches the qualified standard, so that the quality of the material in the preparation process is qualified.
3. According to the preparation method of the low-density flexible high-heat-conductivity wave-absorbing silica gel sheet, the wave-absorbing filler is adopted and the alternating electric field is continuously applied, so that the production process and the detection process are tightly combined, the production efficiency and the quality of products are accelerated, the equipment and the process steps are simplified, the products are easy to industrialize, and the equipment and the production cost are reduced.
4. The preparation equipment for the low-density flexible high-heat-conductivity wave-absorbing silica gel sheet has high integration degree, skillfully adds alternating magnetic field production and real-time quality detection equipment into the equipment, and is matched with materials and processes, so that the quantity of the equipment is reduced, and the production process is simplified; meanwhile, the silicon sheets cut into rectangular blocks are taken out through the second translation material taking mechanism and are conveyed to the detection machine to be correspondingly detected, so that various performances of the silicon sheets in the batch can be rapidly determined, and people can accurately classify and adapt application occasions of the silicon sheets in the current batch according to actual performances of the silicon sheets.
Drawings
FIG. 1 is a schematic diagram of the overall appearance structure of the high-thermal-conductivity wave-absorbing silica gel sheet equipment;
FIG. 2 is a schematic sectional structure view of the high thermal conductivity wave-absorbing silica gel sheet equipment of the invention;
FIG. 3 is a schematic view of a top view mechanism of the high thermal conductivity wave-absorbing silica gel sheet device of the present invention;
fig. 4 is a schematic view of a preparation process of the high thermal conductivity wave-absorbing silica gel sheet.
In the figure: 1. a high-speed stirrer; 101. a stirring motor; 102. crushing fan blades; 103. turning over the raw material hopper; 104. a raw material discharge valve; 105. an alternating electric field coil; 2. a vulcanizing furnace; 201. an electric heating and electric field generator; 202. a vacuum exhaust tube; 203. a finished product discharge valve; 204. an electronic sensor; 3. a molding machine; 301. a first conveyor belt; 302. forming a mold; 303. a lifting frame; 304. a rolling roller; 4. a cutting machine; 401. a second conveyor belt; 402. a tool holder; 403. longitudinal hobbing cutters; 404. a transverse stamping knife; 5. a first translation material taking mechanism; 6. detecting machinery; 7. a second translation material taking mechanism; 8. a packaging machine; 9. a vacuum generator; 10. a vacuum material taking sucker; 11. a high pressure gas station; 12. an electromagnetic valve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, 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.
Examples
Referring to fig. 1 to 4, the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet provided by the embodiment of the invention is prepared from the following components in parts by weight:
vinyl silicone oil: 100, respectively; silicone resin: 10-30 parts of; raw rubber: 60-80 parts; a crosslinking agent: 5-10; 1000 portions of low-density filler and 1500 portions; wave-absorbing filler: 80-100 parts, including: 75-95 parts of barium ferrite coated hollow glass beads and 5-25 parts of magnetic multilayer carbon nanotubes; catalyst: 0.1-0.5; inhibitor (B): 0.1-0.2.
In the embodiment, the paint is prepared from the following components in parts by weight:
vinyl silicone oil: 100, respectively; silicone resin: 15; raw rubber: 70; a crosslinking agent: 8; 1200 parts of low-density filler, wherein: aluminum oxide 300, magnesium oxide 200, boron nitride 200, aluminum nitride 200, beryllium oxide 300; wave-absorbing filler: 90 parts, wherein: 80 parts of barium ferrite coated hollow glass beads and 20 parts of magnetic multilayer carbon nanotubes; catalyst: 0.4; inhibitor (B): 0.15.
the cross-linking agent is one or the mixture of bis-tetra, bis-penta and hydrogen-containing silicone oil.
The inhibitor is a mixture of vinyl silicone oil and acetylene cyclohexanol;
the catalyst is a mixture of vinyl silicone oil and a platinum catalyst.
The magnetic multilayer carbon nanotube is a magnetic multilayer carbon nanotube coated by ferrite particles, the number of layers is less than 100, the tube diameter is less than 10 microns, and the length is 200-500 microns.
The barium ferrite coated hollow glass bead has the particle size of 100-150 microns and the wall thickness of 1-2 microns.
A preparation method of a low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet comprises the following steps:
s1: preparing raw materials: preparing vinyl silicone oil, organic silicon resin, crude rubber, a cross-linking agent, low-density filler, wave-absorbing filler, a catalyst and an inhibitor according to a set weight ratio;
s2: stirring, plasticating and mixing: putting dry materials in the raw materials into a high-speed stirrer for mixing and dispersing; after the dry materials are uniformly mixed, putting wet materials in the raw materials into the mixer and uniformly stirring the materials; continuously applying an alternating electric field in the stirring process; specifically, an oriented electric field forming an included angle of 45 degrees with the geometric center line of the material is applied, the electric field intensity is a high-frequency alternating electric field with the frequency of 6-10MHz and the intensity of 15 x 10 v/m-20 x 10 v/m; after all raw materials are quickly and uniformly mixed, the mixture is input into a reaction container of a vulcanization furnace, vacuumized and heated to 150-180 ℃, so that the molecular weight and viscosity of raw rubber in the mixed raw materials are reduced to improve the plasticity of the raw rubber, proper fluidity is obtained, a gel-like silica gel semi-finished product is obtained, and after color matching and mixing, milky silica gel is changed into a sheet material with a set color so as to meet the requirements of mixing, molding and further processing;
s3: detecting, vulcanizing and forming, wherein the temperature and the electromagnetic wave absorption performance of the gel-like silica gel semi-finished product material in the cavity of the vulcanizing furnace 2 are detected in real time by an electronic sensor 204 arranged in the cavity of the vulcanizing furnace 2, wherein the sensor comprises a temperature sensor and an electromagnetic wave absorption sensor and is matched with the electric heating and electric field generator 201; if not, returning to the step S2, if not, guiding the gel into the mold through the discharge hole, pressing the gel in the mold by using a rolling mechanism to enhance the density and the smoothness of the gel, and naturally cooling the gel-like silica gel semi-finished product to form a solid silica gel sheet state;
s4: trimming and cutting, namely taking the silicon gel sheet cooled into a sheet shape out of the die, and cutting the silicon gel sheet into a silicon gel finished product meeting the set requirements through transverse cutting and longitudinal cutting by a cutter;
s5: and (4) finished product detection and warehousing: conveying the cut and formed silica gel single piece or leftover material to a comprehensive test machine containing a heat conductivity coefficient detection module, a wave-absorbing performance detection module, a resistivity detection module, a voltage-resistant detection module, a tensile strength detection module and a hardness detection module, testing the heat conductivity coefficient, the wave-absorbing performance, the temperature-resistant range, the volume resistivity, the voltage resistance, the flame retardance, the tensile strength, the hardness, the thickness and the like of the finished silica gel, and warehousing qualified products;
s6: classifying and packaging the warehoused products: according to the performance of the detected silica gel pieces, the silica gel pieces in a single batch are packaged in a box body, and classified storage and use according to requirements are realized.
The utility model provides a preparation equipment of ripples silica gel piece is inhaled to flexible high heat conduction of low density, includes high speed mixer 1, vulcanization stove 2, molding machine 3, tailors machinery 4, detection machinery 6 and packaging machinery 8, and high speed mixer 1's major structure is the toper bucket body, the toper bucket body outside is equipped with alternating electric field solenoid 105, applys alternating electric field, accelerates material mixing speed, improves the degree of consistency to the material of toper bucket body.
The top end of the high-speed stirring machine 1 is fixedly provided with a stirring motor 101 through a support, the bottom end of a rotor shaft of the stirring motor 101 is fixedly connected with crushing fan blades 102 in series, lug bosses are symmetrically arranged on two sides of the top end of the high-speed stirring machine 1, both the lug bosses are movably connected with an overturning raw material hopper 103 through pin shafts, the bottom end of the high-speed stirring machine 1 is communicated with a raw material discharge valve 104, an outlet of the raw material discharge valve 104 is communicated with a feed inlet of a vulcanizing furnace 2, the bottom end of the vulcanizing furnace 2 is fixedly provided with an electric heating and electric field generator 201 in an attaching manner, and one side; through the electronic sensor 204 that sets up in the 2 inner chambers of vulcanization stove, this sensor includes temperature sensor and electromagnetism and inhale the wave sensor, with electric heating and electric field generator 201 cooperation carry out real-time detection to the temperature and the electromagnetism of the half-finished product material of gel-like silica gel in the 2 chambeies of vulcanization stove inhale the wave performance. The bottom end of the vulcanizing furnace 2 is communicated with a finished product discharge valve 203, the opening of the finished product discharge valve 203 is positioned at the top of the head end of a forming machine 3, the forming machine 3 comprises a first conveying belt 301, forming molds 302 are arranged on the first conveying belt 301 at equal intervals, lifting frames 303 are vertically fixed on two sides of the middle part of the first conveying belt 301, a pressure-extending rotating roller 304 is movably embedded in the middle part of each lifting frame 303, the top surface of the cylindrical press-forming mold 302 of the pressure-extending rotating roller 304 is pressed on the top surface of the cylindrical press-forming mold 302, a cutting machine 4 is arranged on one side of the tail end of the forming machine 3 in parallel, the cutting machine 4 comprises a second conveying belt 401, a first translation material taking mechanism 5 is arranged between the tail end of the first conveying belt 301 and the head end of the second conveying belt 401, a longitudinal hob 403 and a transverse stamping knife 404 are sequentially arranged on the middle part of the second conveying belt 401 through a knife rest 402, a detection machine, the tail end of the cutting machine 4 is communicated with a packaging machine 8 in the same direction.
In the embodiment, in the high-speed stirring machine 1, the raw materials for preparing the low-density flexible high-heat-conduction wave-absorbing silica gel sheet are poured out from the overturning raw material hopper 103, and after falling into the bottom end of the inner cavity of the high-speed stirring machine 1, the crushing fan blades 102 driven by the stirring motor 101 rotate at high speed under the continuous action of the alternating electric field to perform crushing type stirring on different types of raw materials, including basic materials, heat-conduction fillers such as metal oxides and metal nitrides, and wave-absorbing materials; after being uniformly stirred, the raw material is introduced into a vulcanizing furnace 2 through a raw material discharge valve 104, at the moment, an electric heating and electric field generator 201 is electrified to heat the vulcanizing furnace 2 and a prepared mixture in the vulcanizing furnace 2, meanwhile, a vacuum exhaust pipe 202 is communicated with a vacuum source to exhaust air in an inner cavity of the vulcanizing furnace 2, the mixed raw material of a heat-conducting silica gel sheet is plasticated and mixed in the inner cavity of the vulcanizing furnace 2, so that the molecular weight and viscosity of the raw rubber are reduced to improve the plasticity of the raw rubber, proper fluidity is obtained, the raw rubber is synthesized into the required gel-state silica gel, and then an electronic sensor 204 is arranged in the inner cavity of the vulcanizing furnace 2 and comprises a temperature sensor and an electromagnetic wave absorbing sensor which are matched with the electric heating and electric field generator 201 to detect the temperature and the electromagnetic wave absorbing performance of the gel-like silica gel semi-finished product material in; opening the finished product discharge valve 203 after the finished product is qualified, discharging the gelatinous silica gel to the inner cavity of the forming die 302 on the first conveyer belt 301, moving the first conveyer belt 301 to a station after the current inner cavity of the forming die 302 is filled with a set amount of gelatinous silica gel, replacing a new die, translating the forming die 302 filled with the gelatinous silica gel to the bottom end of the extension and pressing roller 304, extending the gelatinous silica gel to a set thickness after the extension and pressing roller 304 reaches the set requirement, moving the gelatinous silica gel to a solid state after being cooled, taking out the flattened semi-finished silica gel sheet from the inner cavity of the forming die 302 by the first translation and material taking mechanism 5, moving the semi-finished silica gel sheet to the second conveyer belt 401, driving the flattened silica gel sheet to be rolled and cut to a strip shape with a set width through the longitudinal roller 403 by the second conveyer belt 401, and punching the strip shape into a rectangular block shape with a set length by the transverse, the silicon sheets cut into rectangular blocks are conveyed to the tail end of the cutting machine 4 at this time, most of the silicon sheets enter the packaging machine 8 for packaging, and a small part of the silicon sheets is taken out through the second translation material taking mechanism 7 and conveyed to the detection machine 6 for corresponding detection, so that production personnel can know the performance of the silicon sheets of the batch, and people can perform accurate adaptation on application occasions of the silicon sheets of the current batch according to the actual performance of the silicon sheets.
Specifically, a vacuum generator 9 is arranged on the other side of the middle of the forming machine 3, the first translational material taking mechanism 5 and the second translational material taking mechanism 7 both include a vacuum material taking suction cup 10, and the vacuum material taking suction cup 10 and the vacuum exhaust pipe 202 are both communicated to the vacuum generator 9.
In this embodiment, the vacuum generator 9 serves as a vacuum source to provide vacuum during the operation of the present invention, so that the raw material for preparing the silicone sheet can be plasticated and mixed in the reduced pressure state in the vulcanizing furnace 2, the quality of the prepared silicone sheet is improved, the vacuum material taking suction cup 10 takes out the whole sheet-shaped semi-finished silicone sheet from the inner cavity of the forming mold 302 by vacuum suction force, and takes out the finished silicone sheet from the tail end of the cutting machine 4 by suction for corresponding detection.
Specifically, an electronic sensor 204 is installed in the inner cavity of the vulcanizing oven 2, and the sensor comprises a temperature sensor and an electromagnetic wave absorption sensor, and is matched with the electric heating and electric field generator 201 to detect the temperature and the electromagnetic wave absorption performance of the material in the inner cavity of the vulcanizing oven 2 in real time; and when the performance of the material in the reaction is detected to be qualified, the next step is carried out, otherwise, the reaction process is continued until the detection is qualified. When the materials are mixed unevenly or react insufficiently, the electromagnetic wave-absorbing performance of the materials cannot meet the set requirement; only when the materials are uniformly mixed and fully reacted, the electromagnetic wave-absorbing performance can meet the set requirement.
The detection machine 6 comprises a heat conductivity coefficient module, a wave absorption coefficient detection module, a resistivity detection module, a voltage resistance detection module, an electromagnetic wave absorption performance detection module, a tensile strength detection module and a hardness detection module.
In this embodiment, the electronic sensor 204 can adopt a temperature/electromagnetic intensity sensor to accurately measure the temperature and the electric field intensity of the inner cavity of the vulcanizing furnace 2, so as to ensure that the raw materials for preparing the silica gel sheet are plasticated and mixed at a proper temperature to form a gelatinous silica gel semi-finished product, and the wave-absorbing performance of the silica gel semi-finished product meets the requirements; the detection machine 6 comprises software and hardware of a heat conductivity coefficient, a wave absorption coefficient, resistivity, voltage resistance, flame resistance, tensile strength and hardness detection module, and can correspondingly detect the heat conductivity coefficient, the wave absorption performance, the resistivity, the voltage resistance, the flame resistance, the tensile strength and the hardness of the generated silica gel sheet.
Specifically, the first conveyor belt 301 is an intermittent conveyor belt, and the single movement distance of the first conveyor belt 301 is equal to the center distance of two adjacent forming molds 302.
In this embodiment, after the product discharging valve 203 fills the gel-like silica gel product into the forming mold 302, the first conveyor 301 moves once for a single time to move out the filled mold and replace the unfilled mold, thereby realizing an automatic filling operation.
Specifically, a high-pressure gas station 11 is arranged at the side of the forming machine 3, an electromagnetic valve 12 is fixed at the top end of the high-pressure gas station 11, and the high-pressure gas station 11 is communicated with a cylinder at the top end of the transverse punching knife 404 through the electromagnetic valve 12. In this embodiment, the transverse punching knife 404 quickly performs the punching and cutting operation of the silicone sheet by the power of the high pressure gas station 11 and the top end cylinder thereof under the control of the electromagnetic valve 12.
The vulcanizing furnace 2, the electronic sensor 204, the vacuum generator 9 and the high-pressure gas station 11 in the embodiment are known technologies which are already disclosed and widely used in daily industrial production.
The working principle and the using process of the invention are as follows: in a high-speed mixer 1, dumping out raw materials for preparing low-density flexible high-heat-conduction wave-absorbing silica gel sheets from an overturning raw material hopper 103, continuously applying an alternating electric field, after the raw materials fall into the bottom end of an inner cavity of the high-speed mixer 1, carrying out crushing type stirring and dispersion on different types of raw materials comprising heat-conducting fillers such as base materials, metal oxides, metal nitrides and the like and wave-absorbing materials, after the raw materials are uniformly stirred and dispersed, introducing the raw materials into a vulcanizing furnace 2 through a raw material discharge valve 104, electrifying an electric heating and electric field generator 201 at the moment, heating the vulcanizing furnace 2 and a preparation mixture therein, simultaneously communicating a vacuum source with a vacuum exhaust pipe 202, exhausting air in the inner cavity of the vulcanizing furnace 2, plasticating and mixing the mixed raw materials of the heat-conducting silica gel sheets in the inner cavity of the vulcanizing furnace 2, and reducing the molecular weight and viscosity of the mixed raw materials to improve the plasticity of the mixed raw materials, obtaining proper fluidity and synthesizing into the needed gel silica gel; then, an electronic sensor 204 which is arranged in the inner cavity of the vulcanizing furnace 2 and comprises a temperature sensor and an electromagnetic wave absorbing sensor is matched with the electric heating and electric field generator 201 to detect the temperature and the electromagnetic wave absorbing performance of the gel-like silica gel semi-finished product material in the inner cavity of the vulcanizing furnace 2 in real time, after the detection is qualified, a finished product discharge valve 203 is opened, the gel-like silica gel is discharged to the inner cavity of a forming mold 302 on a first conveying belt 301, the first conveying belt 301 translates one station after the gel-like silica gel is filled in the inner cavity of the forming mold 302 at present, a new mold is replaced, the forming mold 302 filled with the gel-like silica gel is translated to the bottom end of a pressure extension roller 304, the thickness reaches the set requirement after the pressure extension of the pressure extension roller 304, and the gel-like silica gel becomes solid after being cooled, at this moment, the flattened semi-finished product sheet is taken out from the inner cavity of the forming mold 302 through a first translation material taking mechanism 5, the silicon sheets are translated to a second conveyor belt 401, the second conveyor belt 401 drives the smooth silicon sheets to sequentially pass through a longitudinal hob 403 to be rolled and cut into long strips with set width, the silicon sheets are punched and cut into rectangular blocks with set length through a transverse punching knife 404, the silicon sheets cut into the rectangular blocks are conveyed to the tail end of a cutting machine 4 at the moment, most of the silicon sheets enter a packaging machine 8 for packaging, a small part of the silicon sheets are taken out through a second translation material taking mechanism 7 and conveyed to a detection machine 6 for corresponding detection, and therefore production personnel can know the performance of the silicon sheets of the batch, and people can perform accurate adaptation on the application occasions of the silicon sheets of the current batch according to the actual performance of the silicon sheets.
Example 2:
the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet, the preparation method and the equipment provided by the embodiment are basically the same as those in the embodiment 1, and the difference is that:
in the embodiment, the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet is prepared from the following components in parts by weight:
vinyl silicone oil: 100, respectively; silicone resin: 10; raw rubber: 60, adding a solvent to the mixture; a crosslinking agent: 5; 1000 parts of low-density filler, wherein: aluminum oxide 200, magnesium oxide 300, boron nitride 100, aluminum nitride 300, beryllium oxide 100; wave-absorbing filler: 80 parts, wherein: 75 parts of barium ferrite-coated hollow glass beads and 5 parts of magnetic multilayer carbon nanotubes; catalyst: 0.1; inhibitor (B): 0.1.
example 3:
the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet, the preparation method and the equipment provided by the embodiment are basically the same as those of the embodiments 1 and 2, and the difference is that:
in the embodiment, the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet is prepared from the following components in parts by weight:
vinyl silicone oil: 100, respectively; silicone resin: 30, of a nitrogen-containing gas; raw rubber: 80; a crosslinking agent: 10; 1500 parts of low-density filler, wherein: aluminum oxide 400, magnesium oxide 400, boron nitride 200, aluminum nitride 300, beryllium oxide 200; wave-absorbing filler: 100 parts, wherein: 95 parts of barium ferrite coated hollow glass beads and 5 parts of magnetic multilayer carbon nanotubes; catalyst: 0.1; inhibitor (B): 0.1.
in other embodiments, the specific process conditions, components and proportions can be within the ranges described above, and can be selected according to requirements, so as to achieve the technical effects of the invention; the present invention is not listed one by one.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet is characterized by being prepared from the following components in parts by weight:
vinyl silicone oil: 100, respectively; silicone resin: 10-30 parts of; raw rubber: 60-80 parts; a crosslinking agent: 5-10; 1000 portions of low-density filler and 1500 portions; wave-absorbing filler: 80-100 parts, including: 75-95 parts of barium ferrite coated hollow glass beads and 5-25 parts of magnetic multilayer carbon nanotubes; catalyst: 0.1-0.5; inhibitor (B): 0.1-0.2; wherein the low-density filler is one of alumina, magnesia, boron nitride, aluminum nitride and beryllium oxide or a mixture of the alumina, the magnesia, the boron nitride, the aluminum nitride and the beryllium oxide.
2. A preparation method of a low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet is characterized by comprising the following steps: the method comprises the following steps:
s1: preparing raw materials: preparing vinyl silicone oil, organic silicon resin, crude rubber, a cross-linking agent, low-density filler, wave-absorbing filler, a catalyst and an inhibitor according to a set weight ratio;
s2: stirring, plasticating and mixing: putting dry materials in the raw materials into a high-speed stirrer for mixing and dispersing; after the dry materials are uniformly mixed, putting wet materials in the raw materials into the mixer and uniformly stirring the materials; continuously applying an alternating electric field in the stirring process; after all raw materials are quickly and uniformly mixed, the mixture is input into a reaction container of a vulcanization furnace, vacuumized and heated to 150-180 ℃, so that the molecular weight and viscosity of raw rubber in the mixed raw materials are reduced to improve the plasticity of the raw rubber, proper fluidity is obtained, a gel-like silica gel semi-finished product is obtained, and after color matching and mixing, milky silica gel is changed into a sheet material with a set color so as to meet the requirements of mixing, molding and further processing;
s3: detecting and vulcanizing and forming, namely detecting the wave absorbing performance of the gel-like silica gel semi-finished product in the reaction container, returning to the step S2 if the gel-like silica gel semi-finished product is unqualified, guiding the gel-like silica gel semi-finished product into a mold if the gel-like silica gel semi-finished product is qualified, pressing the gel in the mold by using a pressing mechanism to enhance the density and the smoothness of the gel-like silica gel semi-finished product, and forming a solid silica gel sheet state after the gel-like silica gel semi;
s4: trimming and cutting, namely taking the silicon gel sheet cooled into a sheet shape out of the die, and cutting the silicon gel sheet into a silicon gel finished product meeting the set requirements through transverse cutting and longitudinal cutting by a cutter;
s5: and (3) finished product detection and warehousing, conveying the cut and molded silica gel single piece or leftover material to a comprehensive test machine containing a heat conductivity coefficient detection module, a wave absorbing performance detection module, a resistivity detection module, a voltage resistance detection module, a tensile strength detection module and a hardness detection module, testing the heat conductivity coefficient, the wave absorbing performance, the temperature resistance range, the volume resistivity, the voltage resistance, the flame retardance, the tensile strength, the hardness, the thickness and the like of the finished silica gel, and warehousing qualified products.
3. The utility model provides a preparation equipment of microwave absorption silica gel piece is inhaled to flexible high heat conduction of low density which characterized in that: the high-speed stirring machine comprises a high-speed stirring machine (1), a vulcanizing furnace (2), a forming machine (3), a cutting machine (4), a detecting machine (6) and a packaging machine (8), wherein the main structure of the high-speed stirring machine (1) is a conical hopper body, and an alternating electric field electromagnetic coil (105) is arranged on the outer side of the conical hopper body; the top of high-speed mixer (1) is fixedly provided with a stirring motor (101) through a support, the bottom end of a rotor shaft of stirring motor (101) is fixedly connected with crushing fan blades (102) in series, the bottom end of high-speed mixer (1) is communicated with a raw material discharge valve (104), the outlet of raw material discharge valve (104) is communicated with the feed inlet of vulcanizing furnace (2), the bottom end of vulcanizing furnace (2) is fixedly provided with an electric heating and electric field generator (201) in a laminating manner, one side of the top end of vulcanizing furnace (2) is connected with a vacuum exhaust tube (202), the bottom end of vulcanizing furnace (2) is communicated with a finished product discharge valve (203), the opening of finished product discharge valve (203) is positioned at the top of the head end of molding machine (3), the molding machine (3) comprises a first conveying belt (301), and molding dies (302) are equidistantly arranged on the first conveying belt (301), the automatic cutting machine is characterized in that lifting frames (303) are vertically fixed on two sides of the middle of the first conveying belt (301), a pressure-extending rotating roller (304) is installed in the middle of each lifting frame (303) in a movable embedded mode, an excircle of the pressure-extending rotating roller (304) is pressed on the top surface of the forming die (302), one side of the tail end of the forming die (3) is provided with the cutting machine (4) in parallel, the cutting machine (4) comprises a second conveying belt (401), a first translation material taking mechanism (5) is arranged between the tail end of the first conveying belt (301) and the head end of the second conveying belt (401), a longitudinal hob (403) and a transverse stamping knife (404) are sequentially installed in the middle of the second conveying belt (401) through a knife rest (402), the detection machine (6) is arranged in parallel at the tail end of the cutting machine (4), and a second translation material taking mechanism (7) is arranged between the tail end of the second conveying belt (401), the tail end of the cutting machine (4) is communicated with the packaging machine (8) in the same direction.
4. The preparation equipment of the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet according to claim 3, characterized in that: the vacuum forming machine is characterized in that a vacuum generator (9) is arranged on the other side of the middle of the forming machine (3), the first translation material taking mechanism (5) and the second translation material taking mechanism (7) both comprise a vacuum material taking sucker (10), and the vacuum material taking sucker (10) and the vacuum air exhaust pipe (202) are both communicated to the vacuum generator (9).
5. The preparation equipment of the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet according to claim 3, characterized in that: an electronic sensor (204) is installed in the inner cavity of the vulcanizing furnace (2), and the sensor comprises a temperature sensor and an electromagnetic wave absorption sensor, and is matched with the electric heating and electric field generator (201) to detect the temperature and the electromagnetic wave absorption performance of the material in the inner cavity of the vulcanizing furnace (2) in real time.
6. The preparation equipment of the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet according to claim 3, characterized in that: the detection machine (6) comprises a heat conductivity coefficient module, a wave absorption coefficient detection module, a resistivity detection module, a voltage resistance detection module, a tensile strength detection module and a hardness detection module.
7. The preparation equipment of the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet according to claim 3, characterized in that: the first conveying belt (301) is an intermittent conveying belt, and the single moving distance of the first conveying belt (301) is equal to the central distance of two adjacent forming molds (302).
8. The preparation equipment of the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet according to claim 3, characterized in that: the avris of molding machine (3) is provided with high-pressure gas station (11), the top of high-pressure gas station (11) is fixed with solenoid valve (12), high-pressure gas station (11) are through solenoid valve (12) intercommunication the cylinder on horizontal stamping knife (404) top.
9. The preparation equipment of the low-density flexible high-thermal-conductivity wave-absorbing silica gel sheet according to claim 3, characterized in that: the two sides of the top end of the high-speed stirrer (1) are symmetrically provided with lug platforms, and the two lug platforms are both movably connected with an overturning raw material hopper (103) through pin shafts.
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