CN111423728B - Heat insulation composite material and preparation method thereof - Google Patents
Heat insulation composite material and preparation method thereof Download PDFInfo
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- CN111423728B CN111423728B CN202010440221.6A CN202010440221A CN111423728B CN 111423728 B CN111423728 B CN 111423728B CN 202010440221 A CN202010440221 A CN 202010440221A CN 111423728 B CN111423728 B CN 111423728B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract
The invention relates to a light heat-insulating composite material which is formed by compounding and molding silicon rubber and an inorganic fiber net, wherein the silicon rubber is obtained by curing a silicon rubber precursor composition, and the silicon rubber precursor composition comprises the following components in parts by weight: 7-95 parts of alpha, omega-dihydroxy polydimethylsiloxane; 1-15 parts of dimethyl silicone oil; 10-500 parts of light filler; 10-500 parts of flame-retardant filler; 1-15 parts of a cross-linking agent; 1-15 parts of a coupling agent; 1-5 parts of a catalyst; 1-2 parts of pigment. The light heat-insulating composite material prepared by the invention can be molded at room temperature, is cured and crosslinked by utilizing moisture in the air, has low requirement on molding equipment, does not need heating and cooling for energy conservation, and has a simple molding process. The inorganic fiber net is used as a framework, the strength is high, and the heat insulation performance of the composite material is further enhanced by adding the inorganic fiber net.
Description
Technical Field
The invention relates to the field of heat insulation materials, in particular to a light heat insulation composite material and a preparation method thereof.
Background
The heat insulating material has the unique performances of heat preservation, heat insulation, fire prevention and the like, is widely applied to various industries such as energy utilization, automobile manufacturing, national defense engineering, chemical production and the like, and is also closely related to daily life. The use of the heat insulating material can effectively reduce heat loss and save fuel, and simultaneously can improve the working and living environment, ensure safe production and improve the working efficiency. Therefore, the development of the heat insulation material industry, particularly the development and the utilization of high-quality heat insulation materials, has very important practical significance for the economic construction of China.
Currently, foam, aerogel, mica are insulation materials that are of general interest. However, the foam plastic has the disadvantages of low strength and fire hazard, the price of the aerogel product is very expensive, the manufacturing process is complex, and the mica sheet product is hard and brittle in texture, so that the application range is limited. Moreover, the single material often cannot overcome the inherent defects, and the composite material can obtain the effect with excellent comprehensive performance. Therefore, it is of great significance to develop a heat insulating material which has good heat insulating performance, soft material, light weight and delays heat diffusion.
The room temperature vulcanized silicone rubber is general silicone rubber and can be used within the temperature range of 60-200 ℃. Heat conductivity of room temperature silicone rubber is around 0.27W/(m.C.), whereas general purpose heat insulating material has a heat conductivity of not more than 0.23W/(m.C.), there is apparently a technical obstacle to room temperature vulcanized silicone rubber as a heat insulating material. The room temperature vulcanized silicone rubber has improved performance, and can be modified by changing side chain groups on one hand and adding corresponding various additives on the other hand. Has good compatibility with other materials and good compatibility. Therefore, the heat-insulating property of the room-temperature silicone rubber can be improved by a technical means of the composite material, and the heat-insulating material is endowed with the properties of softness, weather aging resistance, fatigue resistance, insulating property, solvent resistance, physiological inertia and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: and provides a room temperature cured light heat insulation composite material and a preparation method thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a heat-insulating composite material is formed by compounding silicone rubber and an inorganic fiber net.
The silicone rubber layer is obtained by curing a silicone rubber precursor composition, and the silicone rubber precursor composition comprises the following components in parts by weight:
7-95 parts of alpha, omega-dihydroxy polydimethylsiloxane;
1-15 parts of dimethyl silicone oil;
10-500 parts of light filler;
10-500 parts of flame-retardant filler;
1-15 parts of a cross-linking agent;
1-15 parts of a coupling agent;
1-5 parts of a catalyst;
1-2 parts of pigment;
the kinematic viscosity of the alpha, omega-dihydroxy polydimethylsiloxane at 25 ℃ is 1000-600000 cst; the kinematic viscosity of the dimethyl silicone oil is 5-1000 cst at 25 ℃.
Preferably, the kinematic viscosity of the alpha, omega-dihydroxy polydimethylsiloxane at 25 ℃ is 5000-50000 cst; the kinematic viscosity of the dimethyl silicone oil is 5-100 cst at 25 ℃.
More preferably, the alpha, omega-dihydroxy polydimethylsiloxane is composed of 60-80 parts by weight of alpha, omega-dihydroxy polydimethylsiloxane with kinematic viscosity at 25 ℃ of 10000-600000 cst and 5-20 parts by weight of alpha, omega-dihydroxy polydimethylsiloxane with kinematic viscosity at 25 ℃ of 1000-10000 cst.
The alpha, omega-dihydroxy polydimethylsiloxane is mixed by alpha, omega-dihydroxy polydimethylsiloxane with various kinematic viscosities, and the viscosity and the curing crosslinking degree of a product can be flexibly adjusted, so that the tensile strength rate with proper mechanical properties is obtained.
Preferably, the light filler is selected from one or more of glass hollow microspheres, carbon hollow microspheres, phenolic aldehyde hollow microspheres, alumina hollow microspheres and mullite hollow microspheres.
Further preferably, the light filler is glass hollow microspheres.
Compared with other hollow microspheres, the glass hollow microspheres have lower density and poorer thermal conductivity. The granularity of the common glass hollow microsphere is 10-250 μm, and the wall thickness is 1-2 μm. The hollow glass beads have the characteristics of high compressive strength, high melting point, high resistivity, small thermal conductivity coefficient, small thermal shrinkage coefficient and the like. The hollow glass beads have obvious weight reduction, sound insulation and heat preservation effects, so that the product has good anti-cracking performance and reprocessing performance. And the hollow glass beads have large yield on the market, are easy to obtain and have low price.
Preferably, the flame retardant filler is selected from one or more of aluminum hydroxide, magnesium hydroxide, ammonium polyphosphate and anhydrous zinc borate.
Further preferably, the flame retardant filler is aluminum hydroxide.
When the aluminum hydroxide is heated and decomposed, crystal water is released. The process is a strong endothermic reaction, absorbs a large amount of heat, and can play a role in cooling the polymerThe water vapor generated by the reaction can dilute the combustible gas and inhibit the spread of combustion. New refractory metal oxide Al2O3Has higher activity, can catalyze the thermo-oxidative crosslinking reaction of the polymer, form a layer of carbonized film on the surface of the polymer, and the carbonized film can weaken the heat transfer and mass transfer effects during combustion, thereby playing a role in flame retardance. Al (Al)2O3Can also adsorb smoke dust particles and play a role in inhibiting smoke. Compared with other series of flame retardants, the flame retardant has good combustion-supporting effect and no smoke. And the aluminum hydroxide flame retardant has large yield on the market and low price.
Preferably, the crosslinking agent is selected from one or more of methyltriethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, isopropyltriethoxysilane, isopropyltrimethoxysilane, isobutyltriethoxysilane, isobutyltrimethoxysilane, tetramethoxysilane, and tetraethoxysilane.
Preferably, the coupling agent is selected from one or more of aminopropyltrimethoxysilane, aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-mercaptopropyltrimethoxysilane, isocyanatopropyltrimethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane/N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane, N-diethyl-3-aminopropyltrimethoxysilane, bis- [3- (methoxysilyl) -propyl ] -amine and 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane.
More preferably, the coupling agent is a mixture of aminopropyltrimethoxysilane, methyltriethoxysilane and tetraisopropyl titanate.
More preferably, the coupling agent is a mixture of 3 parts of aminopropyltrimethoxysilane, 3 parts of methyltriethoxysilane and 1 part of tetraisopropyl titanate.
A large number of experimental data results prove that the material obtained by using the mixed solution of aminopropyltrimethoxysilane, methyltriethoxysilane and tetraisopropyl titanate as a crosslinking system has the best mechanical property, and the curing time can be adjusted and realized according to the proportion of the aminopropyltrimethoxysilane, the methyltriethoxysilane and the tetraisopropyl titanate, so that the control of the operation time of the forming process is facilitated. And the three raw materials are easy to obtain, and the price is economical and practical.
Preferably, the catalyst is selected from one or more of n-butyl titanate, tetraisobutyl titanate, n-propyl titanate, tetraisopropyl titanate, tert-butyl titanate and titanium chelate of ethyl acetoacetate.
Another aspect of the invention relates to a method for preparing a lightweight thermal insulation composite material, comprising the steps of:
s1, uniformly mixing alpha, omega-dihydroxy polydimethylsiloxane, dimethyl silicone oil, a filler and a pigment according to parts by weight, and drying in vacuum at 100-150 ℃ to obtain a mixture;
s2, cooling the mixture obtained in the step S1 to a temperature lower than 60 ℃, sequentially adding a coupling agent, a cross-linking agent and a catalyst, and uniformly mixing to obtain a light silica gel material solidified at room temperature;
s3, coating a layer of the light silica gel material obtained in the step S2 in a forming groove, then putting a fiber net in the forming groove, coating a layer of light silica gel material, and standing for 24 hours for forming;
and S4, taking out after molding, and deeply crosslinking in an oven at 60 ℃ for 24-60h to obtain the heat-insulating composite material.
The invention is further explained below:
however, the invention obviously lightens the weight of the heat insulation material and has sound insulation and heat preservation effects by adding the glass hollow microspheres, so that the product has good anti-cracking performance and reprocessing performance. The material obtained by using the mixed solution of aminopropyltrimethoxysilane, methyltriethoxysilane and tetraisopropyl titanate as a crosslinking system has excellent mechanical properties, and the curing time can be adjusted and realized according to the proportion of the aminopropyltrimethoxysilane, the methyltriethoxysilane and the tetraisopropyl titanate, thereby being beneficial to mastering the operation time of the molding process. The strength of the composite material is improved by using the organic fiber net as a framework, and the heat insulation performance of the composite material is further enhanced by adding the inorganic fiber net. Comprehensively improves the heat insulation performance of the room temperature silicone rubber, and simultaneously endows the heat insulation material with the performances of softness, weather aging resistance, fatigue resistance, insulativity, solvent resistance, physiological inertia and the like.
Compared with the prior art, the invention has the following beneficial effects:
(1) the light heat-insulating composite material prepared by the invention can be molded at room temperature, is cured and crosslinked by utilizing moisture in the air, has low requirement on molding equipment, does not need heating and cooling for energy conservation, has a simple molding process, and has low curing shrinkage rate, long operation time and simple operation.
(2) The light heat-insulating composite material prepared by the invention introduces the hollow microspheres, reduces the density of the composite material and can improve the heat-insulating property of the composite material.
(3) The light heat-insulating composite material prepared by the invention adopts silicon rubber as a base material, and is soft; the inorganic fiber net is used as a framework, the strength is high, and the heat insulation performance of the composite material is further enhanced by adding the inorganic fiber net.
Detailed Description
The present invention will be described in detail with reference to examples. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Example 1
According to the weight, 75 parts of alpha, omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 1000cst, 5 parts of simethicone with the kinematic viscosity of 50cst, 10 parts of aluminum hydroxide, 20 parts of hollow glass beads and 1 part of carbon black pigment are mixed in a planetary stirrer, and are heated to 120 ℃ simultaneously, and are mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, after the base material is cooled to 50 ℃,3 parts of aminopropyl trimethoxy silane, 3 parts of methyl triethoxy silane and 1 part of tetraisopropyl titanate mixed liquid are slowly added, and are continuously mixed to form completely uniform silicon rubber for later use. And (3) coating a layer of the obtained silicon rubber in a prefabricated forming groove, then putting a glass fiber net into the groove, coating a layer of light silica gel material, uniformly coating the surface of the glass fiber net, standing the glass fiber net at room temperature for 24 hours for crosslinking and forming, then taking out the composite material, and putting the composite material into a 60 ℃ oven for deep crosslinking for 48 hours.
Example 2
According to the weight, 75 parts of alpha, omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 1000cst, 5 parts of simethicone with the kinematic viscosity of 50cst, 10 parts of aluminum hydroxide, 50 parts of hollow glass beads and 1 part of carbon black pigment are mixed in a planetary stirrer, and are heated to 120 ℃ simultaneously, and are mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, after the base material is cooled to 50 ℃,3 parts of aminopropyl trimethoxy silane, 3 parts of methyl triethoxy silane and 1 part of tetraisopropyl titanate mixed liquid are slowly added, and are continuously mixed to form completely uniform silicon rubber for later use. And (3) coating a layer of the obtained silicon rubber in a prefabricated forming groove, then putting a glass fiber net into the groove, coating a layer of light silica gel material, uniformly coating the surface of the glass fiber net, standing the glass fiber net at room temperature for 24 hours for crosslinking and forming, then taking out the composite material, and putting the composite material into a 60 ℃ oven for deep crosslinking for 48 hours.
Example 3
According to weight, 60 parts of alpha, omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 20000cst, 15 parts of alpha, omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 1000cst, 5 parts of simethicone with the kinematic viscosity of 50cst, 10 parts of aluminum hydroxide, 50 parts of hollow glass beads and 1 part of carbon black pigment are mixed in a planetary stirrer, heated to 120 ℃, and mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, after the base material is cooled to 50 ℃,3 parts of aminopropyl trimethoxysilane, 3 parts of methyl triethoxysilane and 1 part of tetraisopropyl titanate mixed solution are slowly added, and the mixture is continuously mixed into completely uniform silicon rubber for later use. And (3) coating a layer of the obtained silicon rubber in a prefabricated forming groove, then putting a glass fiber net into the groove, coating a layer of light silica gel material, uniformly coating the surface of the glass fiber net, standing the glass fiber net at room temperature for 24 hours for crosslinking and forming, then taking out the composite material, and putting the composite material into a 60 ℃ oven for deep crosslinking for 48 hours. The addition of the alpha, omega-dihydroxy polydimethylsiloxane with higher viscosity can increase the viscosity of the precursor composition and improve the workability, but the content of hydroxyl is correspondingly reduced, the curing crosslinking degree is higher, and the mechanical property tensile strength rate after curing is obviously improved.
Comparative example 1
According to the weight, 75 parts of alpha, omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 1000cst, 5 parts of simethicone with the kinematic viscosity of 50cst, 10 parts of aluminum hydroxide, 50 parts of light calcium carbonate and 1 part of carbon black pigment are mixed in a planetary stirrer, and are heated to 120 ℃ simultaneously, and are mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, after the base material is cooled to 50 ℃,3 parts of aminopropyl trimethoxy silane, 3 parts of methyl triethoxy silane and 1 part of tetraisopropyl titanate mixed liquid are slowly added, and are continuously mixed to form completely uniform silicon rubber for later use. And (3) coating a layer of the obtained silicon rubber in a prefabricated forming groove, then putting a glass fiber net into the groove, coating a layer of light silica gel material, uniformly coating the surface of the glass fiber net, standing the glass fiber net at room temperature for 24 hours for crosslinking and forming, then taking out the composite material, and putting the composite material into a 60 ℃ oven for deep crosslinking for 48 hours. The light calcium carbonate replaces hollow glass beads, so that the composite specific gravity is increased, the whole weight is increased, and the heat insulation performance is reduced.
Comparative example 2
According to the weight, 75 parts of alpha, omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 1000cst, 5 parts of simethicone with the kinematic viscosity of 50cst, 60 parts of aluminum hydroxide and 1 part of carbon black pigment are mixed in a planetary stirrer, simultaneously heated to 120 ℃, mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, after the base material is cooled to 50 ℃, the mixed solution of 3 parts of aminopropyl trimethoxy silane, 3 parts of methyl triethoxy silane and 1 part of tetraisopropyl titanate is slowly added, and the mixture is continuously mixed to form completely uniform silicon rubber for later use. And (3) coating a layer of the obtained silicon rubber in a prefabricated forming groove, then putting a glass fiber net into the groove, coating a layer of light silica gel material, uniformly coating the surface of the glass fiber net, standing the glass fiber net at room temperature for 24 hours for crosslinking and forming, then taking out the composite material, and putting the composite material into a 60 ℃ oven for deep crosslinking for 48 hours. The aluminum hydroxide replaces the hollow glass beads, so that the specific gravity of the composite material is increased, the whole weight is increased, and the heat insulation performance is reduced.
Comparative example 3
According to the weight, 75 parts of alpha, omega-dihydroxy polydimethylsiloxane with the kinematic viscosity of 1000cst, 5 parts of simethicone with the kinematic viscosity of 50cst and 1 part of carbon black pigment are mixed in a planetary stirrer, simultaneously heated to 120 ℃, mixed for 3 hours under a vacuum drying environment of-0.1 MPa to obtain a base material, after the base material is cooled to 50 ℃,3 parts of aminopropyl trimethoxy silane, 3 parts of methyl triethoxy silane and 1 part of tetraisopropyl titanate mixed solution are slowly added, and the mixture is continuously mixed to form completely uniform silicon rubber for later use. And (3) coating a layer of the obtained silicon rubber in a prefabricated forming groove. And standing at room temperature for 24h for crosslinking molding, taking out the composite material, and deeply crosslinking in an oven at 60 ℃ for 48 h. The composite technology of the filler and the fiber net is not adopted, the heat insulation effect of the silicon rubber is poor, and the tensile strength is low.
The insulation composite materials prepared in the above examples and comparative examples were subjected to an insulation test. A heating plate having a length of 10cm and a width of 10cm was vertically fixed with respect to a horizontal plane, and its temperature was raised to a constant temperature of 600 ℃. The thermal insulation composite materials prepared in the above examples and comparative examples were each used as a sample sheet (length: 10cm, width: 10cm, thickness: 2 mm). The sample piece was placed vertically with respect to the horizontal plane and one side of the sample piece was brought close to the heating plate so that there was a 1mm gap between the sample piece and the heating plate. At 300 seconds, the temperature (in c) of the other side of the sample piece was measured and recorded. Specific data are shown in table 1.
The thermal insulation composite materials prepared in the above examples and comparative examples were tested for tensile resistance, and a strip 10cm long and 2cm wide and 2mm thick was tested on a tensile machine, and since the tensile strength of the fiber web was mainly determined by introducing the fiber web and the deformation rate of the fiber web was much smaller than that of the silica gel layer, the silica gel layer did not break when the fiber web broke (tensile force a 1), and therefore, the tensile force measured by the tensile machine suddenly decreased after the fiber web layer broke, and a maximum value a2 occurred in the latter half of the stretching, which can reflect the mechanical properties of the silica gel, as shown in table 1.
TABLE 1 composite thermal insulation Material Performance test results
The experimental data show that the invention breaks through the technical obstacles of low strength and no heat insulation effect of the silicon rubber. Through the flame retardant additive and modification, the silicone rubber with poor heat insulation effect remarkably improves the heat insulation performance, and the hollow glass beads simultaneously reduce the specific gravity of the composite material. As the amount of the hollow glass beads added increases, the heat insulating property of the composite material increases and the specific gravity decreases. The mechanical property of the material is greatly improved by compounding the fiber net. Silica gel is used as a base material, so that the composite material overcomes the defect that the traditional materials such as foamed plastic, aerogel, mica and the like are hard and brittle, and the soft characteristic of the composite material enables the composite material to be used for sealing rings, sealing gaskets and the like, thereby widening the application field of heat insulation materials.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (6)
1. The heat insulation composite material is characterized in that the heat insulation composite material is formed by compounding silicon rubber and an inorganic fiber net;
the silicone rubber is obtained by curing a silicone rubber precursor composition, which comprises the following components in parts by weight:
7-95 parts of alpha, omega-dihydroxy polydimethylsiloxane;
1-15 parts of dimethyl silicone oil;
10-500 parts of light filler;
10-500 parts of flame-retardant filler;
1-15 parts of a cross-linking agent;
1-15 parts of a coupling agent;
1-5 parts of a catalyst;
1-2 parts of pigment;
the kinematic viscosity of the alpha, omega-dihydroxy polydimethylsiloxane at 25 ℃ is 1000-600000 cst; the kinematic viscosity of the dimethyl silicone oil is 5-1000 cst at 25 ℃;
the light filler is glass hollow microspheres;
the flame-retardant filler is selected from one or more of aluminum hydroxide, magnesium hydroxide, ammonium polyphosphate and anhydrous zinc borate;
the cross-linking agent is selected from one or more of methyltriethoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, vinyltriethoxysilane, vinyltrimethoxysilane, isopropyltriethoxysilane, isopropyltrimethoxysilane, isobutyltriethoxysilane, isobutyltrimethoxysilane, tetramethoxysilane and tetraethoxysilane.
2. The heat insulating composite material as claimed in claim 1, wherein the α, ω -dihydroxy polydimethylsiloxane has a kinematic viscosity of 5000-50000 cst at 25 ℃; the kinematic viscosity of the dimethyl silicone oil is 5-100 cst at 25 ℃.
3. The heat-insulating composite material as claimed in claim 1 or 2, wherein the α, ω -dihydroxypolydimethylsiloxane is composed of 60 to 80 parts by weight of α, ω -dihydroxypolydimethylsiloxane having a kinematic viscosity at 25 ℃ of 10000 to 600000cst and 5 to 20 parts by weight of α, ω -dihydroxypolydimethylsiloxane having a kinematic viscosity at 25 ℃ of 1000-.
4. The insulating composite of claim 1, wherein the coupling agent is selected from the group consisting of aminopropyltrimethoxysilane, aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, gamma-methacryloxypropyltrimethoxysilane, gamma-mercaptopropyltrimethoxysilane, isocyanatopropyltrimethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane/N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane, N, one or more of N-diethyl-3-aminopropyltrimethoxysilane, bis- [3- (methoxylsilane) -propyl ] -amine and 2- (3, 4-epoxycyclohexyl) ethyltrimethoxysilane.
5. The insulating composite of claim 1, wherein the catalyst is selected from one or more of n-butyl titanate, tetraisobutyl titanate, n-propyl titanate, tetraisopropyl titanate, t-butyl titanate, and titanium chelates of ethyl acetoacetate.
6. A method of making a thermal insulation composite as claimed in any one of claims 1 to 5, comprising the steps of:
s1, uniformly mixing the alpha, omega-dihydroxy polydimethylsiloxane, the dimethyl silicone oil, the filler and the pigment in the claim 1 in parts by weight, and drying in vacuum at 100-150 ℃ to obtain a mixture;
s2, cooling the mixture to a temperature lower than 60 ℃, sequentially adding a coupling agent, a cross-linking agent and a catalyst, and uniformly mixing to obtain a room-temperature cured light silica gel material;
s3, coating a layer of the light silica gel material obtained in the step S2 in a forming groove, then putting a fiber net in the forming groove, coating a layer of light silica gel material, and standing for 24 hours for forming;
and S4, taking out after molding, and deeply crosslinking in an oven at 60 ℃ for 24-60h to obtain the heat-insulating composite material.
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| CN113278289B (en) * | 2021-06-02 | 2022-04-22 | 华南理工大学 | Flame-retardant room-temperature vulcanized silicone rubber and preparation method thereof |
| CN113429928B (en) * | 2021-06-21 | 2023-06-02 | 湖南航天三丰科工有限公司 | Self-curing silicone rubber composite material and preparation process thereof |
| CN115197576B (en) * | 2022-07-12 | 2024-04-09 | 苏州昌和应用材料有限公司 | Silica gel pad for pressing machine, manufacturing method thereof and hot air circulation oven |
| CN115124976B (en) * | 2022-07-19 | 2023-12-05 | 淄博众晓新材料科技有限公司 | Composite phase-change gel heat-insulating energy-storage material and preparation method thereof |
| CN115449221A (en) * | 2022-10-14 | 2022-12-09 | 强新正品（苏州）环保材料科技有限公司 | Ceramic silica gel heat insulation sheet for new energy battery and production process thereof |
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| CN101368080A (en) * | 2008-09-24 | 2009-02-18 | 陈栋梁 | Expansion flame-proof organosilicon fluid sealant and method of producing the same |
| CN108003628B (en) * | 2017-12-28 | 2021-05-07 | 唐山师范学院 | Flame-retardant room-temperature vulcanized silicone rubber and preparation method thereof |
| CN110641101A (en) * | 2019-10-08 | 2020-01-03 | 3M材料技术(合肥)有限公司 | Heat insulation composite material |
| CN111057465A (en) * | 2019-12-25 | 2020-04-24 | 湖南航天三丰科工有限公司 | Room-temperature-cured insulating coating material and preparation method thereof |
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