CN114193851B - Thermal protection composite part between electric cores and forming process thereof - Google Patents

Thermal protection composite part between electric cores and forming process thereof Download PDF

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Publication number
CN114193851B
CN114193851B CN202111467681.9A CN202111467681A CN114193851B CN 114193851 B CN114193851 B CN 114193851B CN 202111467681 A CN202111467681 A CN 202111467681A CN 114193851 B CN114193851 B CN 114193851B
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organic silicon
silicon resin
stirring
powder
mica
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CN114193851A (en
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姚静
翁金龙
孙虎
欧阳林
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Zhejiang Rongtai Electrical Equipment Co ltd
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Zhejiang Rongtai Electrical Equipment Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B19/00—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica
    • B32B19/06—Layered products comprising a layer of natural mineral fibres or particles, e.g. asbestos, mica next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/105—Ceramic fibres
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

The application relates to the technical field of new energy battery pack protection parts, in particular to a thermal protection composite part between electric cores and a forming process thereof. The thermal protection composite part comprises a protection main body, wherein the protection main body comprises a first glass fiber cloth, a first mica plate, a first ceramic fiber layer, an aerogel layer, a second ceramic fiber layer, a second mica plate, a second ceramic fiber layer and a second glass fiber cloth which are integrally hot-pressed and formed in sequence from top to bottom; the adhesive used in the integral hot press molding process of the protective body is organic silicon resin. When this application is applied to between electric core and the electric core, meet thermal expansion, meet cold shrink, effectively eliminate internal stress, sustainable and electric core surface laminating mutually play better protection effect, can compensate the deformation that the electric core produced, promote the life and the security performance of group battery.

Description

Thermal protection composite part between electric cores and forming process thereof
Technical Field
The application relates to the field of new energy battery pack protection parts, in particular to a thermal protection composite part between electric cores and a forming process thereof.
Background
With the increasing importance of the environment protection problem and the rising price of petroleum, new energy automobiles are increasingly popular. In recent years, the domestic new energy automobile industry develops rapidly, and mainly benefits from the breakthrough of the power battery pack technology in the new energy automobile. The power battery pack is used as a core element for storing and outputting the energy of the new energy automobile, and determines the service life and the safety performance of the new energy automobile.
Currently, most of power battery packs are lithium ion battery packs, and mainly comprise a lithium iron phosphate battery, a lithium manganate battery, a lithium cobaltate battery, a lithium titanate battery, a ternary battery and the like. The lithium ion battery pack consists of a battery module, wherein the battery module is formed by superposing dozens of single battery cells. Epoxy self-adhesive paint is filled between the monomer cells in the related technology to realize superposition combination.
Aiming at the superposition mode among the single battery cells in the related technology, the inventor finds that the technical scheme has the following defects: the volume of the electrode in the lithium ion battery pack can change in the battery charging and discharging process, and the change always exists in the battery pack using process, so that the change can cause the volume change of the single battery cells, the single battery cells are mutually extruded, larger stress is generated, and the service life and the safety performance of the battery pack are influenced.
Disclosure of Invention
In order to solve the problem of poor service life and safety performance of the battery pack in the related art, the application provides a thermal protection composite part between battery cells and a forming process thereof.
The application provides a thermal protection composite part between electric core, it is realized through following technical scheme:
the heat protection composite part comprises a protection main body, wherein the protection main body comprises first glass fiber cloth, a first mica plate, a first ceramic fiber layer, an aerogel layer, a second ceramic fiber layer, a second mica plate and second glass fiber cloth which are integrally hot-pressed in sequence from top to bottom; the adhesive used in the integral hot press molding process of the protective body is organic silicon resin.
Through adopting above-mentioned technical scheme, the thermal protection composite part of this application production has better toughness, and the condensate that wherein organosilicon resin formed has the stress release effect, can eliminate the stress that appears mutual extrusion and produce between the monomer electric core. Therefore, when the thermal protection composite mica part prepared in the application is applied between the battery cells, the thermal protection composite mica part expands when encountering heat and contracts when encountering cold, the internal stress can be effectively eliminated, and the thermal protection composite mica part is continuously attached to the surface of the battery cells, so that a better protection effect is achieved. In addition, the deformation that this application can compensate the electricity core and produce promotes the life and the security performance of group battery.
Preferably, the aerogel layer is one of a silica aerogel layer and a titania modified aerogel layer.
Through adopting above-mentioned technical scheme, can play the effect of guaranteeing whole thermal-insulated performance, reduce the overall quality of this application simultaneously.
Preferably, the silicone resin is KR-242A silicone resin or modified KR-242A silicone resin.
Preferably, the modified organic silicon resin is prepared from the following raw materials in percentage by mass: 0.1-0.5% of diethylenetriamine, 2-5% of hollow microsphere powder, 5-10% of mica powder, 20-50% of methanol, 10-20% of fluoroalkyl vinyl glycol polymer and the balance KR-242A silicone resin.
By adopting the technical scheme, the modified organic silicon resin can improve the overall heat insulation efficiency and high temperature resistance, prolong the overall service life and ensure the safety performance of the new energy battery pack.
Preferably, the hollow bead powder is at least one of silica-based hollow beads, alumina-based hollow beads, and magnesia-based hollow beads.
By adopting the technical scheme, the produced organic silicon resin can be ensured to have better heat insulation effect.
Preferably, the preparation method of the modified organic silicon resin comprises the following steps: adding diethylenetriamine accounting for 20-30% of the total mass of the diethylenetriamine into KR-242A organic silicon resin and fluoroalkyl vinyl diol polymer mixture, pre-reacting for 100-150s at 70-85 ℃, cooling to below 4 ℃, adding methanol, stirring uniformly, adding the rest diethylenetriamine, and stirring uniformly to obtain the modified organic silicon resin.
By adopting the technical scheme, the preparation method of the modified organic silicon resin is relatively simple, and the production cost is convenient to reduce.
Preferably, the glass fiber cloth is alkali-free glass fiber chopped strand mats or alkali-free glass fiber cloth; the ceramic fiber adopted in the ceramic fiber layer is at least one of alumina fiber, zirconia fiber, magnesia fiber, titania fiber, silicon nitride fiber and silicon nitride fiber.
By adopting the technical scheme, the alkali-free glass fiber is required to be transported so as to avoid the damage of the introduced metal ions to the solidified substance formed by the organic silicon resin, and ensure the integral mechanical property and the use stability; the ceramic fiber can improve the overall mechanical property and has better protection effect.
The forming process of the thermal protection composite part between the battery cells is realized through the following technical scheme:
a process for forming a thermal protection composite between cells, comprising the steps of:
coating organic silicon resin on the upper surface and the lower surface of the aerogel layer, respectively attaching a first ceramic fiber layer and a second ceramic fiber layer on the upper surface and the lower surface of the aerogel layer, and curing and forming to obtain a composite body for later use;
coating organic silicon resin on the upper and lower surfaces of the composite body, respectively attaching a first mica plate and a second mica plate on the upper and lower surfaces of the composite body, and curing and forming to obtain a semi-finished product;
coating the semi-finished product with organic silicon resin, respectively attaching the first glass fiber cloth and the second glass fiber cloth on the upper surface and the lower surface of the semi-finished product, and curing and forming to obtain a prefabricated finished product;
and step four, carrying out vacuum hot pressing and curing molding on the prefabricated finished product to obtain a thermal protection composite finished product.
By adopting the technical scheme, the preparation method is relatively simple and is convenient for mass production.
Preferably, the vacuum hot-pressing temperature in the fourth step is 140-165 ℃, the vacuum degree of the vacuum hot-pressing is-80.0 to-100 Kpa, and the vacuum forming time is controlled to be 3-4h.
By adopting the technical scheme, the quality of the prepared thermal protection composite finished product can be ensured.
In summary, the present application has the following advantages:
1. the battery pack has the advantages that when the battery pack is applied to the battery cell, the battery pack expands when in contact with heat, contracts when in contact with cold, continuously contacts with the surface of the battery cell, has a good protection effect, can compensate the deformation of the battery cell, and prolongs the service life and safety performance of the battery pack.
2. The phase-change temperature control layer can absorb heat and is not easy to generate volume change, stress caused by whole thermal expansion and cold contraction can be reduced, and the whole safety performance and the service life are further improved.
Detailed Description
The present application is described in further detail below with reference to examples.
Preparation example
Preparation example 1
The modified organic silicon resin is prepared from the following raw materials in percentage by mass: 0.2% diethylenetriamine, 4% silica hollow microbead powder, 8% muscovite powder, 50% methanol, 10% fluoroalkyl vinyl glycol polymer (trade name: side chain fluoro glycol polymer of POLYFOX, OMNOVA Co., U.S.A.), and 27.8% KR-242A silicone resin.
The preparation method of the modified organic silicon resin comprises the following steps: 0.4g of diethylenetriamine is added into 278g of KR-242A organic silicon resin and 100g of fluoroalkyl vinyl glycol polymer mixture, the mixture is reacted for 150s at 85 ℃, after the temperature is reduced below 4 ℃, 500g of methanol, 40g of silica hollow microsphere powder and 80g of muscovite powder are added, the mixture is stirred uniformly for 10min at 400rpm, the rest 1.6g of diethylenetriamine is added, and the mixture is stirred for 20min at 320rpm, so that the modified organic silicon resin A is obtained.
Preparation example 2
The modified organic silicon resin is prepared from the following raw materials in percentage by mass: 0.2% diethylenetriamine, 2% silica hollow microbead powder, 2% alumina hollow microbead powder, 8% muscovite powder, 50% methanol, 10% fluoroalkyl vinyl glycol polymer and 27.8% KR-242A silicone resin.
The preparation method of the modified organic silicon resin comprises the following steps: 0.4g of diethylenetriamine is added into 278g of KR-242A organic silicon resin and 1200g of fluoroalkyl vinyl glycol polymer mixture, the mixture is reacted for 150s at 85 ℃, after the temperature is reduced below 4 ℃, 500g of methanol, 20g of silica hollow microsphere powder, 20g of alumina hollow microsphere powder and 80g of muscovite powder are added, the mixture is uniformly stirred for 10min at 400rpm, the rest 1.6g of diethylenetriamine is added, and the mixture is stirred for 20min at 320rpm, so that the modified organic silicon resin B is obtained.
Preparation example 3
The modified organic silicon resin is prepared from the following raw materials in percentage by mass: 0.2% diethylenetriamine, 4% silica hollow microbead powder, 8% muscovite powder, 50% methanol, 4% FM-7725 modified hydroxysiloxane of JNC, 6% polytrifluoropropyl methyl siloxane (CAS number: 63148-56-1, wohesprofu Biotechnology Co., ltd.) and 27.8% KR-242A silicone.
The preparation method of the modified organic silicon resin comprises the following steps: adding 0.4g of diethylenetriamine into 278g of KR-242A organic silicon resin and 60g of polytrifluoropropyl methyl siloxane mixture, pre-reacting for 60s at 85 ℃, adding 40g of FM-7725 modified hydroxyl siloxane, pre-reacting for 100s at 85 ℃, cooling to below 4 ℃, adding 500g of methanol, 40g of silica hollow microsphere powder and 80g of muscovite powder, uniformly stirring for 10min at 400rpm, adding the rest 1.6g of diethylenetriamine, and stirring for 20min at 320rpm to obtain modified organic silicon resin C.
Preparation example 4
The preparation of the artificially synthesized fluorophlogopite powder coated by nano metallic silver comprises the following steps:
s1, selecting 40-mesh synthetic fluorophlogopite produced by Shijia Ming mineral products Co., ltd, weighing 2kg of synthetic fluorophlogopite, adding into 8kg of hydrochloric acid with the concentration of 6mol/L, dispersing for 0.5h at the rotation speed of 120rpm, standing for 1.0h, removing supernatant, and leaving a precipitate at the lower layer;
s2, adding 8.0kg of deionized water into the precipitate obtained in the step S1, stirring, and dehydrating by using a plate-and-frame filter press, wherein a filter cake obtained after the plate-and-frame filter press is dehydrated is the required coarsening artificial synthesized fluorophlogopite powder;
s3, adding the coarsened artificially synthesized fluorophlogopite powder in S2 into an activation container, adding 6.0kg of deionized water into the activation container, heating to 68.0 ℃ while stirring to obtain a feed liquid, stirring the feed liquid for 30 minutes under the condition that the feed liquid is kept at 68 ℃, regulating the pH value of the feed liquid to 1.6 by using hydrochloric acid with the concentration of 6mol/L, and using a sample liquid diaphragm pump to obtain 2.0kg of a first activation liquid with the concentration of 2.5% by weight (the first activation liquid is SnCl) 4 Solution) is gradually dripped into the feed liquid, the dripping is completed within 1 hour, and meanwhile, 6mol/L hydrochloric acid is added to adjust the pH value of the feed liquid to be between 1.6;
s4, coating a second activation layer on the first activation layer by a liquid phase precipitation method, wherein the chemical component of the second activation layer is TiO 2 Obtaining activated artificially synthesized fluorophlogopite powder;
s4.1, after the first activated liquid is dripped, naOH solution with the weight percentage concentration of 8% is added into an activation container, the pH value of the feed liquid is adjusted to 2.0, and meanwhile, the temperature of the feed liquid is adjusted to 80 ℃;
s4.2, under the adjustment of the pH controller, simultaneously pumping a second activating solution with the concentration of 4mol/L into the activating container by using a sample solution diaphragm pump (the second activating solution is TiCl) 4 Solution) and 8% NaOH solution, and controlling the pumping speed through a pH controller to keep the pH value of the feed liquid at 2.0; stopping adding the second activating solution and 8% NaOH solution when the added second activating solution reaches 1.6kg, stirring the feed liquid for 30 minutes under the condition that the feed liquid is kept at 80 ℃, and dehydrating the feed liquid by adopting a plate-and-frame filter press to obtain a filter cake, namely the required activated artificially synthesized fluorophlogopite powder;
s5, preparing a silver ammonia solution by the following steps: 14g of AgNO by weight 3 Mixing with 250g NaOH solution with weight percentage concentration of 5%, stirring uniformly, then dripping ammonia water with weight percentage concentration of 12.5% until the solution is clear, and concentrating by weight percentageNitric acid with the temperature of 15.5 percent is used for regulating the pH value to 12.5, so as to obtain silver-ammonia solution;
s6, silver mirror reaction to obtain nano metal silver coated artificially synthesized fluorophlogopite powder;
s6.1, adding the activated artificially synthesized fluorophlogopite powder obtained in the step S4 into a reaction container, adding 6.0kg of deionized water into the reaction container, regulating the temperature of the materials in the reaction container to 28 ℃, adding 1g of sodium thiosulfate, and stirring for 1 hour;
s6.2, gradually adding the reducing solution into a reaction container, completing the addition within 1.5 hours, then stirring for 1 hour, and adjusting the pH value of materials in the reaction container to 12, wherein the reducing solution is prepared according to the following process: mixing 160g of anhydrous acetaldehyde and 4840g of 30% ethanol solution by weight percent, and uniformly stirring to obtain a reducing solution;
s6.3, adding the prepared silver-ammonia solution into the reaction container at a stirring speed of 300rpm at a dropping speed of 5ml/min, wherein the silver-ammonia solution is added within 1 hour, controlling the temperature of materials in the reaction container to be 25 ℃ in the process of adding the silver-ammonia solution, and regulating the pH value of the materials in the reaction container by nitric acid to maintain the pH value of the materials in the reaction container to be between 12;
s6.4, after the silver ammonia solution is added, preserving the temperature for 1 hour at the stirring rotation speed of 300rpm, filtering out powder and drying to obtain the nano metallic silver coated artificially synthesized fluorophlogopite powder.
Preparing combined mica powder: 700g of muscovite, 80g of phlogopite and 220g of nano metal silver coated artificially synthesized fluorophlogopite powder are weighed, placed in 4L of KH570 silane coupling agent aqueous solution with the concentration of 3.0L/L, treated by ultrasonic waves for 15min at the stirring speed of 80rpm, filtered, and the mica mixed powder obtained by filtering is dried at the temperature of 10 ℃ to obtain the combined mica powder.
Preparing a low heat conduction filler: 300g of silica hollow microbeads, 100g of nano silica and 5g of zirconia were weighed and mixed at 200rpm for 5 minutes to obtain a low thermal conductivity filler.
Preparing toughening filler: 400g of chopped alkali-free glass fibers, 85g of silicon carbide fibers and 15g of zinc oxide whiskers were weighed.
The silicone resin was prepared from 100g KR-242A silicone resin, 45g FM-7721 modified hydroxy siloxane, 144.8g methanol and 0.2g diethylenetriamine.
The preparation method of the organic silicon resin comprises the following steps: 0.05g of diethylenetriamine, 100g of KR-242A organic silicon resin and 45g of FM-7725 modified hydroxyl siloxane are reacted in advance at 68 ℃ for 120s, after the temperature is reduced to 4 ℃, 144.8g of methanol is added and stirred at 100rpm for 10min, 0.15g of diethylenetriamine is added and stirred at 60rpm for 2.0min to obtain the organic silicon resin.
The mica slurry consists of 100g of combined mica powder, 8g of toughening filler, 5g of low heat conduction filler and 113g of methanol.
The molding process of the flexible low-heat-conductivity insulating heat-resistant mica plate comprises the following steps of:
s1, a preparation method of mica slurry, namely, putting 100g of combined mica powder, 8g of toughening filler and 5g of low-heat-conductivity filler which are accurately metered into a high-speed dispersion kettle, stirring for 3.0min at 120rpm, adding 113g of methanol, stirring for 5min at 120rpm, and uniformly mixing to obtain the mica slurry with 50% of solid content;
s2, weighing 70g of organic silicon resin, adding the organic silicon resin into the mica slurry in the S1, and stirring for 5min at 200rpm to obtain casting slurry;
s3, pouring the pouring slurry in the step S2 into a mold, heating the pouring slurry to 78 ℃ for 60min until the liquid level of the pouring slurry reaches half of the groove depth of the mold, removing methanol in the pouring slurry, cutting a reflecting sheet according to the size of the mold during heating the mold, coating organic silicon resin on two side surfaces of the obtained reflecting sheet, and naturally curing, wherein paint films on two side surfaces of the reflecting sheet are in a gel state;
s4, after heating, paving the reflecting sheet in a mould, filling casting slurry in the mould, heating to 78 ℃ for 60min, and removing methanol in the casting slurry;
s5, preparing a mica insulation product by adopting a four-step hot press molding method, wherein the hot press temperature in the first step of hot press molding is 88 ℃, the pressure is 0.5MPa, the air is discharged for 2S after 20S hot press, and the heat is generatedThe total pressing time is 40s; the second step of hot press forming, wherein the hot press temperature is 110 ℃, the pressure is 0.6MPa, the air is discharged for 2s after hot press is performed for 30s, and the total hot press time is 90s; the hot pressing temperature in the third hot pressing forming is 180 ℃, the pressure is 0.8MPa, and the hot pressing duration is 160s; and fourthly, performing hot press forming at 120 ℃ under the pressure of 0.6MPa for 60 seconds, and placing the special-shaped mica insulation product obtained by the four-step hot press forming at 90 ℃ for 90 minutes, and naturally cooling to obtain the flexible low-heat-conductivity insulation heat-resistant mica plate with the thickness of 0.8+/-0.05 mmmm. Test parameters: density 1.78g/cm 3 The glue content is 32.1%, the electrical strength is 32.6kv/mm, and the heat conductivity coefficient is 0.114W/cm.
Preparation example 5
The titania aerogel starting material consisted of 14.5g of titanyl sulfate, 49.1g of water, 17.3g of glycerol, 17.3g of dimethylformamide, 1.7g of polyvinylpyrrolidone having an average molecular weight of 5.4 ten thousand.
The preparation of the titanium dioxide aerogel comprises the following steps:
1) Mixing and stirring titanyl sulfate and water for 4 hours at room temperature until the mixture is clear and transparent;
2) Then adding polyvinylpyrrolidone, and stirring for 5 hours until the mixture is clear and transparent;
3) Then adding glycerol and dimethylformamide, and stirring for 10 minutes to obtain titanium dioxide sol;
4) Then sealing the sol obtained in the step 3), and standing at 80 ℃ for 48 hours to obtain a titanium dioxide wet gel;
5) Then taking out the titanium dioxide wet gel obtained in the step 4), and soaking the titanium dioxide wet gel with deionized water for 6 times at the temperature of 80 ℃ for 24 hours each time, and replacing the deionized water before each soaking;
6) Soaking the titanium dioxide wet gel obtained in the step 5) with ethanol at 50 ℃ for 6 times, wherein each soaking time is 24 hours, and the ethanol is replaced by new ethanol before each soaking time;
7) Then placing the titanium dioxide wet gel obtained in the step 6) into an ethanol supercritical drying device, and keeping the pressure at 15MPa and the temperature at 280 ℃ for 3 hours to obtain amorphous TiO2 aerogel;
finally, heating the amorphous titanium dioxide aerogel prepared in the step 7) at 950 ℃ for 3 hours to obtain the rutile type TiO2 aerogel. Tested that the specific surface area of the amorphous Ti02 aerogel is 477m 2 Per g, rutile Ti02 aerogel has a specific surface area of 185m 2 The rutile crystal phase content after sintering at 900 ℃ is 98%.
Preparation example 6
The preparation method of the heat-resistant mica laminate in preparation example 6: the heat-resistant mica paper of hp-5 (thickness 0.32mm, electric insulation Co., ltd.) is selected, the organic silicon resin in preparation example 1 is adopted as an interlayer adhesive, the mica paper is bonded together and then subjected to hot pressing treatment, the hot pressing temperature in hot pressing forming is 160 ℃, the pressure is 1.5Mpa, the hot pressing time is 10min, and the hot mica laminated plate with the thickness of 1.1+/-0.05 mm is obtained by natural cooling.
Examples
Example 1
The application discloses a thermal protection composite part between battery cells, which comprises a protection main body, wherein the protection main body comprises first glass fiber cloth, a first mica plate, a first ceramic fiber layer, an aerogel layer, a second mica plate, a second ceramic fiber layer and second glass fiber cloth which are integrally formed through hot pressing in sequence from top to bottom; the binder used in the integral hot press molding process of the protective body is organic silicon resin, specifically modified organic silicon resin A in preparation example 1.
The first glass fiber cloth and the second glass fiber cloth are alkali-free glass fiber cloth-EWR 200 of Jiangyin Wankan chemical Co., ltd. The first mica plate and the second mica plate were the low thermal conductivity insulating heat resistant mica plates in preparation example 4.
The first ceramic fiber layer and the second ceramic fiber layer are ceramic fiber paper (Zigbluban thermal insulation material Co., ltd.) with a thermal conductivity of 0.032W/(m.K), and the custom thickness is 0.5+ -0.05 mm. The aerogel layer is a silicon dioxide aerogel felt (gallery Weina energy saving technology Co., ltd.) with a thermal conductivity of 0.03W/(m.K), and the custom thickness is 0.6+ -0.05 mm.
A process for forming a thermal protection composite between cells, comprising the steps of:
step one, coating the upper and lower surfaces of the gel cloth with the modified organic silicon resin A in preparation example 1, wherein the coating amount of the modified organic silicon resin A of each surface layer is controlled to be 180g/m 2 Attaching the first ceramic fiber layer and the second ceramic fiber layer on the upper surface and the lower surface of the gel cloth respectively, and curing and forming to obtain a composite body for later use;
step two, coating the modified organic silicon resin A in preparation example 1 on the upper and lower surfaces of the composite body, wherein the coating amount of the modified organic silicon resin A on each surface layer is controlled to be 180g/m 2 Attaching the first mica plate and the second mica plate on the upper surface and the lower surface of the composite body respectively, and solidifying and forming to obtain a semi-finished product;
step three, coating the semi-finished product with the modified organic silicon resin A in the preparation example 1, wherein the coating amount of the modified organic silicon resin A on each surface layer is controlled to be 180g/m 2 Attaching a first glass fiber cloth and a second glass fiber cloth on the upper surface and the lower surface of a semi-finished product respectively, curing and molding, coating the modified organic silicon resin A in preparation example 1 on the surface of the first glass fiber cloth, coating the modified organic silicon resin A in preparation example 1 on the surface of the second glass fiber cloth, and controlling the coating amount of the modified organic silicon resin A to be 180g/m 2 Solidifying and forming to obtain a prefabricated finished product;
and step four, placing the prefabricated finished product prepared in the step three into a vacuum hot-pressing mold, coating high-temperature vacuum diversion cotton outside the vacuum hot-pressing mold, sleeving a vacuum bag, sending the vacuum bag into a vacuum hot-pressing tank, communicating the vacuum bag with a vacuumizing tube of the vacuum hot-pressing tank, performing vacuum hot-pressing molding, controlling the vacuum degree of vacuum hot-pressing at 165 ℃ and-100 Kpa, controlling the vacuum molding time at 4h, and curing and molding to obtain the thermal protection composite finished product.
Example 2
Example 2 differs from example 1 in that: the silicone resin used was the modified organic resin B of preparation example 2.
Example 3
Example 3 differs from example 1 in that: the silicone resin used was the modified organic resin C of preparation example 3.
Example 4
Example 4 differs from example 1 in that: the silicone resin adopts KR-242A silicone resin.
Example 5
Example 5 differs from example 1 in that: the first glass fiber cloth and the second glass fiber cloth are glass fiber mesh cloth, the specification is 5*5/160g, and Shandong TianRui New Material science and technology Co.
Example 6
Example 6 differs from example 1 in that: the aerogel layer was the rutile type Ti02 aerogel in preparation example 5.
Example 7
Example 7 differs from example 1 in that: the first mica plate and the second mica plate were heat-resistant mica laminate plates in preparation example 6.
Example 8
Example 8 differs from example 5 in that: the aerogel layer was the rutile type Ti02 aerogel in preparation example 6; the silicone resin used was the modified organic resin C of preparation example 3.
Comparative example
Comparative example 1
Comparative example 1 differs from example 1 in that: the aerogel layer was not compounded in the thermal protection composite.
Comparative example 2
Comparative example 2 differs from example 1 in that: the first ceramic fiber layer and the second ceramic fiber layer are not compounded in the thermal protection composite.
Comparative example 3
Comparative example 3 differs from example 1 in that: the first glass fiber cloth and the second glass fiber cloth are not compounded in the thermal protection composite piece.
Comparative example 4
Comparative example 4 differs from example 1 in that: the silicone resin was a commercially available methylphenyl silicone resin.
Performance test
Detection method/test method
1. Electrical strength test: GB/T5019.2-2009 mica product test method, 22 "electrical strength" test, test sample thickness of 0.39mm-0.41mm, using a Phi 25 mm/Phi 75mm cylindrical electrode system, a fast boost mode (boost speed of 1.0 kV/s) was performed in a 25# transformer oil at 23 ℃ + -2deg.C, and electrical strength test was performed on the thermal protection composites in examples 1-8 and comparative examples 1-4.
2. And (3) heat conduction coefficient test: reference is made to GB/T10297-1998 Hot wire method for measuring thermal conductivity of non-metallic solid materials.
3. And (3) glue content testing: the heat protection composites in examples 1-8 and comparative examples 1-4 were subjected to glue content testing according to GB/T5019.2-2009 item 8.4.5, "silicone adhesive without reinforced material (insoluble adhesive)".
Data analysis
Table 1 shows the test parameters of examples 1-8 and comparative examples 1-4
Figure GDA0004214022860000111
Figure GDA0004214022860000121
As can be seen from the combination of examples 1 to 8 and the comparative examples 1 to 4 and the table 1, the thermal conductivity and the electrical strength of the thermal protection composites prepared in examples 1 to 3 are similar, the thermal conductivity and the electrical strength of the thermal protection composites prepared in examples 1 to 3 are superior to those of example 4, and the thermal conductivity and the electrical strength of the thermal protection composites prepared in example 4 are superior to those of comparative example 1, so that the overall heat insulation effect and the electrical strength can be improved by using the modified silicone resin.
As can be seen from the combination of examples 1-8 and comparative examples 1-4 and table 1, the thermal conductivity and electrical strength of the thermal protection composite prepared in example 1 are better than those of example 7, and therefore, the thermal protection composite prepared using the flexible low thermal conductivity insulating heat resistant mica plate in preparation example 4 is better in thermal insulation performance and electrical strength.
It can be seen from the combination of examples 1 to 8 and comparative examples 1 to 4 and table 1 that the thermal conductivity and the electrical strength of examples 1 and 6 are superior to those of comparative example 1, and therefore, the lamination of the aerogel layer can effectively improve the heat insulation effect of the present application, and has a positive effect on the improvement of the overall electrical strength.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.

Claims (1)

1. A thermal protection composite between cells, characterized by: the protective body comprises a first glass fiber cloth, a first mica plate, a first ceramic fiber layer, an aerogel layer, a second ceramic fiber layer, a second mica plate and a second glass fiber cloth which are integrally formed in a hot-pressing mode in sequence from top to bottom; the adhesive used in the integral hot-press molding process of the protective main body is modified organic silicon resin;
the first glass fiber cloth and the second glass fiber cloth are alkali-free glass fiber cloth-EWR 200 of Jiangyin Wanzhen chemicals Co., ltd;
the first mica plate and the second mica plate are low-heat-conduction insulating heat-resistant mica plates, and the preparation process is as follows:
the preparation of the artificially synthesized fluorophlogopite powder coated by nano metallic silver comprises the following steps:
s1, selecting 40-mesh synthetic fluorophlogopite produced by Shijia Ming mineral products Co., ltd, weighing 2kg of synthetic fluorophlogopite, adding into 8kg of hydrochloric acid with the concentration of 6mol/L, dispersing for 0.5h at the rotation speed of 120rpm, standing for 1.0h, removing supernatant, and leaving a precipitate at the lower layer;
s2, adding 8.0kg of deionized water into the precipitate obtained in the step S1, stirring, and dehydrating by using a plate-and-frame filter press, wherein a filter cake obtained after the plate-and-frame filter press is dehydrated is coarsened artificially synthesized fluorophlogopite powder;
s3, adding the coarsened synthetic fluorophlogopite powder in S2 into an activation container, adding 6.0kg of deionized water into the activation container, heating to 68.0 ℃ while stirring to obtain a feed liquid, stirring the feed liquid for 30 minutes under the condition that the feed liquid is kept at 68 ℃, regulating the pH value of the feed liquid to 1.6 by using hydrochloric acid with the concentration of 6mol/L, and regulating the temperature of the feed liquid to 68 ℃ when the feed liquid isUnder the condition of the temperature of DEG C, using a sample diaphragm pump to pump 2.0kg of SnCl with the weight percentage concentration of 2.5 percent 4 Gradually dropwise adding the solution serving as a first activating solution into the feed liquid, finishing dropwise adding within 1 hour, and simultaneously adding 6mol/L hydrochloric acid to adjust the pH value of the feed liquid to 1.6;
s4, coating a second activation layer on the first activation layer by a liquid phase precipitation method, wherein the chemical component of the second activation layer is TiO 2 Obtaining activated artificially synthesized fluorophlogopite powder;
s4.1, after the first activated liquid is dripped, naOH solution with the weight percentage concentration of 8% is added into an activation container, the pH value of the feed liquid is adjusted to 2.0, and meanwhile, the temperature of the feed liquid is adjusted to 80 ℃;
s4.2, under the adjustment of the pH controller, simultaneously pumping TiCl with the concentration of 4mol/L into the activation container by using a sample diaphragm pump 4 The solution is used as a second activating solution and 8% NaOH solution, and the pumping speed is controlled by a pH controller, so that the pH value of the feed liquid is kept at 2.0; stopping adding the second activating solution and 8% NaOH solution when the second activating solution reaches 1.6kg, stirring the feed liquid for 30 minutes under the condition that the feed liquid is kept at 80 ℃, and dehydrating the feed liquid by adopting a plate-and-frame filter press to obtain a filter cake, namely activated artificially synthesized fluorophlogopite powder;
s5, preparing a silver ammonia solution by the following steps: 14g AgNO 3 Mixing with 250g of NaOH solution with the weight percentage concentration of 5%, uniformly stirring, then dripping ammonia water with the weight percentage concentration of 12.5% until the solution is clear, and regulating the pH value to 12.5 by nitric acid with the weight percentage concentration of 15.5% to obtain silver-ammonia solution;
s6, silver mirror reaction to obtain nano metal silver coated artificially synthesized fluorophlogopite powder;
s6.1, adding the activated artificially synthesized fluorophlogopite powder obtained in the step S4 into a reaction container, adding 6.0kg of deionized water into the reaction container, regulating the temperature of the materials in the reaction container to 28 ℃, adding 1g of sodium thiosulfate, and stirring for 1 hour;
s6.2, gradually adding the reducing solution into a reaction container, completing the addition within 1.5 hours, then stirring for 1 hour, and adjusting the pH value of materials in the reaction container to 12, wherein the reducing solution is prepared according to the following process: mixing 160g of anhydrous acetaldehyde and 4840g of 30% ethanol solution by weight percent, and uniformly stirring to obtain a reducing solution;
s6.3, adding the prepared silver-ammonia solution into the reaction container at a stirring speed of 300rpm at a dropping speed of 5ml/min, wherein the silver-ammonia solution is added within 1 hour, controlling the temperature of the materials in the reaction container to be 25 ℃ in the process of adding the silver-ammonia solution, and regulating the pH value of the materials in the reaction container by nitric acid to maintain the pH value of the materials in the reaction container to be 12;
s6.4, after adding the silver ammonia solution, preserving heat for 1 hour at a stirring speed of 300rpm, filtering out powder and drying to obtain nano metallic silver coated artificially synthesized fluorophlogopite powder;
preparing combined mica powder: weighing 700g of muscovite, 80g of phlogopite and 220g of nano metal silver coated artificially synthesized fluorophlogopite powder, placing the powder into 4L of KH570 silane coupling agent water solution with the concentration of 3.0L/L, carrying out ultrasonic treatment for 15min at the stirring rotation speed of 80rpm, filtering the powder with the ultrasonic frequency of 35kHz, and drying the mica mixed powder obtained by filtering at the temperature of 10 ℃ to obtain combined mica powder;
preparing a low heat conduction filler: weighing 300g of silica hollow microbeads, 100g of nano silica and 5g of zirconia, and mixing for 5min at 200rpm to obtain a low heat conduction filler;
preparing toughening filler: 400g of chopped alkali-free glass fibers, 85g of silicon carbide fibers and 15g of zinc oxide whiskers were weighed;
the organic silicon resin is prepared from 100g of KR-242A organic silicon resin, 45g of FM-7721 modified hydroxyl siloxane, 144.8g of methanol and 0.2g of diethylenetriamine;
the preparation method of the organic silicon resin comprises the following steps: pre-reacting 0.05g of diethylenetriamine, 100g of KR-242A organic silicon resin and 45g of FM-7725 modified hydroxyl siloxane at 68 ℃ for 120s, cooling to 4 ℃, adding 144.8g of methanol, stirring at 100rpm for 10min, adding 0.15g of diethylenetriamine, and stirring at 60rpm for 2.0min to obtain the organic silicon resin;
the mica slurry consists of 100g of combined mica powder, 8g of toughening filler, 5g of low heat conduction filler and 113g of methanol;
the molding process of the flexible low-heat-conductivity insulating heat-resistant mica plate comprises the following steps of:
s1, a preparation method of mica slurry, namely, putting 100g of combined mica powder, 8g of toughening filler and 5g of low-heat-conductivity filler which are accurately metered into a high-speed dispersion kettle, stirring for 3.0min at 120rpm, adding 113g of methanol, stirring for 5min at 120rpm, and uniformly mixing to obtain the mica slurry with 50% of solid content;
s2, weighing 70g of organic silicon resin, adding the organic silicon resin into the mica slurry in the S1, and stirring at 200rpm for 5min to obtain casting slurry;
s3, pouring the pouring slurry in the step S2 into a mold, heating the pouring slurry to 78 ℃ for 60min until the liquid level of the pouring slurry reaches half of the groove depth of the mold, removing methanol in the pouring slurry, cutting a reflecting sheet according to the size of the mold during heating the mold, coating the two sides of the obtained reflecting sheet with organic silicon resin, and naturally curing, wherein paint films on the two sides of the reflecting sheet are in a gel state;
s4, after heating, paving the reflecting sheet in a mould, filling casting slurry in the mould, heating to 78 ℃ for 60min, and removing methanol in the casting slurry;
s5, preparing a mica insulation product by adopting a four-step hot press molding method, wherein the hot press temperature in the first step of hot press molding is 88 ℃, the pressure is 0.5MPa, the air is discharged for 2S after 20S of hot press, and the total hot press time is 40S; in the second step of hot press forming, the hot press temperature is 110 ℃, the pressure is 0.6MPa, the air is discharged for 2s after hot press is performed for 30s, and the total hot press time is 90s; the hot pressing temperature in the third hot pressing forming is 180 ℃, the pressure is 0.8MPa, and the hot pressing duration is 160s; fourthly, the hot pressing temperature is 120 ℃, the pressure is 0.6MPa, the duration is 60s, the special-shaped mica insulation product obtained by the four-step hot pressing is treated for 90min at the temperature of 90 ℃, and the flexible low-heat-conductivity insulation heat-resistant mica plate with the thickness of 0.8+/-0.05 mm is obtained after natural cooling;
the first ceramic fiber layer and the second ceramic fiber layer are ceramic fiber paper with the heat conductivity coefficient of 0.032W/(m.K) and the thickness of 0.5+/-0.05 mm, which is produced by the thermal insulation materials of the Timber, the Co., ltd;
the aerogel layer is rutile type TiO 2 Aerogel, which consists of 14.5g of titanyl sulfate, 49.1g of water, 17.3g of glycerol, 17.3g of dimethylformamide and 1.7g of polyvinylpyrrolidone, wherein the average molecular weight of polyvinylpyrrolidone is 5.4 ten thousand; the preparation method comprises the following steps:
1) Mixing and stirring titanyl sulfate and water for 4 hours at room temperature until the mixture is clear and transparent;
2) Then adding polyvinylpyrrolidone, and stirring for 5 hours until the mixture is clear and transparent;
3) Then adding glycerol and dimethylformamide, and stirring for 10 minutes to obtain titanium dioxide sol;
4) Then sealing the sol obtained in the step 3), and standing at 80 ℃ for 48 hours to obtain a titanium dioxide wet gel;
5) Then taking out the titanium dioxide wet gel obtained in the step 4), and soaking the titanium dioxide wet gel with deionized water for 6 times at the temperature of 80 ℃ for 24 hours each time, and replacing the deionized water before each soaking;
6) Then soaking the titanium dioxide wet gel in the step 5) with ethanol for 6 times at 50 ℃ for 24 hours each time, and replacing new ethanol before each soaking;
7) Then placing the titanium dioxide wet gel obtained in the step 6) into an ethanol supercritical drying device, and keeping the pressure at 15MPa and the temperature at 280 ℃ for 3 hours to obtain amorphous TiO 2 An aerogel;
finally, heating the amorphous titanium dioxide aerogel prepared in the step 7) at 950 ℃ for 3 hours to obtain rutile TiO 2 An aerogel;
the modified organic silicon resin is prepared from the following raw materials in percentage by mass: 0.2% diethylenetriamine, 4% silica hollow microbead powder, 8% muscovite powder, 50% methanol, 4% FM-7725 modified hydroxysiloxane of JNC Japan, 6% polytrifluoropropyl methyl siloxane having CAS number 63148-56-1 of Wohesprofu biotechnology Co., ltd, and 27.8% KR-242A silicone resin;
the preparation method comprises the following steps: adding 0.4g of diethylenetriamine into 278g of KR-242A organic silicon resin and 60g of polytrifluoropropyl methyl siloxane mixture, pre-reacting for 60s at 85 ℃, adding 40g of FM-7725 modified hydroxyl siloxane, pre-reacting for 100s at 85 ℃, cooling to below 4 ℃, adding 500g of methanol, 40g of silica hollow microsphere powder and 80g of muscovite powder, stirring for 10min at 400rpm, adding the rest 1.6g of diethylenetriamine, and stirring for 20min at 320rpm to obtain modified organic silicon resin;
a process for forming a thermal protection composite between cells, comprising the steps of:
coating the upper and lower surfaces of the aerogel layer with modified organic silicon resin, wherein the coating amount of the modified organic silicon resin on each surface is controlled to be 180g/m 2 Attaching the first ceramic fiber layer and the second ceramic fiber layer on the upper surface and the lower surface of the aerogel layer respectively, and curing and forming to obtain a composite body for later use;
coating modified organic silicon resin on the upper and lower surfaces of the composite body, wherein the coating amount of the modified organic silicon resin on each surface is controlled to be 180g/m 2 Attaching the first mica plate and the second mica plate on the upper surface and the lower surface of the composite body respectively, and solidifying and forming to obtain a semi-finished product;
coating the upper and lower surfaces of the semi-finished product with modified organic silicon resin, wherein the coating amount of the modified organic silicon resin on each surface is controlled to be 180g/m 2 Attaching a first glass fiber cloth and a second glass fiber cloth on the upper surface and the lower surface of a semi-finished product respectively, curing and molding, coating modified organic silicon resin on the surface of the first glass fiber cloth, coating modified organic silicon resin on the surface of the second glass fiber cloth, and controlling the coating amount of the modified organic silicon resin to be 180g/m 2 Solidifying and forming to obtain a prefabricated finished product;
and step four, placing the prefabricated finished product prepared in the step three into a vacuum hot-pressing mold, coating high-temperature vacuum diversion cotton outside the vacuum hot-pressing mold, sleeving a vacuum bag, sending the vacuum bag into a vacuum hot-pressing tank, communicating the vacuum bag with a vacuumizing tube of the vacuum hot-pressing tank, performing vacuum hot-pressing molding, controlling the vacuum degree of vacuum hot-pressing at 165 ℃ and-100 kPa, controlling the vacuum molding time at 4 hours, and curing and molding to obtain a finished product of the thermal protection composite part.
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