CN111534220A - High-performance ablation-resistant coating and preparation method thereof - Google Patents
High-performance ablation-resistant coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-performance ablation-resistant coating, which comprises an inner heat-insulating layer and an outer temperature-resistant layer, and also discloses a preparation method thereof. The coating disclosed by the invention has strong bonding strength, can resist instantaneous high temperature of more than 1500 ℃, effectively blocks external heat flow to protect devices in a base material, still has good repairable performance after being washed by heat flow for many times, and has strong practical application value.
Description
Technical Field
The invention belongs to the technical field of production of ablation-resistant polymer coatings, and particularly relates to a high-performance ablation-resistant coating and a preparation method thereof.
Background
Under the condition of high-temperature heat flow, the ablation-resistant material absorbs and blocks external heat through physicochemical state and structural change. The ablation-resistant material is mainly divided into a melting type ablation-resistant material, a carbonization type ablation-resistant material, a sublimation type ablation-resistant material and the like. With the continuous development of the aerospace industry and the special equipment manufacturing industry, stricter performance requirements are provided for ablation-resistant coatings in the market, and the existing ablation-resistant coatings mainly use single-layer epoxy resin or phenolic resin and the like as a matrix, and realize high temperature resistance and heat insulation by adding high-temperature-resistant fillers and low-density fillers, so that the defects of single product structure, single function, thicker construction thickness, poorer construction performance and the like exist in the existing ablation-resistant coatings.
A high-temperature resistant antistatic coating (publication number: CN104877524A) comprises the following raw materials in parts by weight: 37-40 parts of organic silicon resin, 15-18 parts of xylene, 12-14 parts of high-aluminum fiber, 9-11 parts of magnesium chloride, 8-13 parts of polyisocyanate curing agent, 10-12 parts of nano silicon dioxide, 10-13 parts of cobalt oxide, 9-13 parts of aluminum oxide, 43-45 parts of epoxy resin, 20-24 parts of conductive powder, 30-35 parts of styrene-acrylic emulsion, 3-4 parts of graphite powder, 2-3 parts of carbon black and 40-50 parts of diluent. The paint disclosed by the patent has the advantages of high temperature resistance, oil resistance and good antistatic effect, but is easy to peel off under the action of high temperature.
A high-temperature resistant water-based paint (publication number: CN110885595A) comprises the following raw materials in parts by weight: 10-20 parts of polyvinyl alcohol, 10-20 parts of water-soluble alkyd resin, 10-20 parts of water-soluble epoxy resin, 5-10 parts of polyethylene terephthalate, 3-5 parts of ceramic microspheres, 3-5 parts of high silica glass fibers, 3-5 parts of high-temperature resistant sizing agent of rubber powder polyphenyl particles, 1-3 parts of emulsifier, 1-3 parts of wetting agent, 1-3 parts of defoaming agent, 1-3 parts of dispersing agent and the balance of deionized water.
In the field of aerospace and special equipment manufacturing, an ablation-resistant coating formula with high temperature resistance and heat insulation performance and a preparation method thereof are urgently needed to be developed so as to meet the increasingly developed product requirements.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the problems in the prior art are solved, and the high-performance ablation-resistant coating and the preparation method thereof are provided, have strong bonding strength, and can effectively block external heat flow to protect devices in the substrate.
The technical scheme adopted by the invention is as follows:
a high-performance ablation-resistant coating comprises a heat insulation layer of an inner layer and a temperature-resistant layer of an outer layer;
the heat insulation layer is prepared from a heat insulation coating A component and a heat insulation coating B component;
the component A of the heat-insulating coating comprises the following raw materials: 60-70 parts of organic silicon resin, 10-20 parts of polyol, 1-2 parts of isocyanate, 30-45 parts of low-density filler and 15-30 parts of reinforcing fiber A11-2 parts by weight of nano amorphous carbon black, 1-2 parts by weight of dimethyl silicone oil, 1-2 parts by weight of coupling agent and 20-60 parts by weight of solvent A1；
The component B of the heat-insulating coating comprises the following raw materials: 3 to 5 parts by weight of ethyl orthosilicate B10.5 to 1 part by weight of a catalyst, 15 to 25 parts by weight of a solvent B1The catalyst is one or two of dibutyltin dilaurate and stannous octoate;
the temperature resistant layer is prepared from a high-temperature resistant coating A component and a high-temperature resistant coating B component;
the component A of the high-temperature resistant coating comprises the following raw materials: 50-60 parts of high-temperature-resistant resin, 10-15 parts of polycarbonate, 20-45 parts of ablation-resistant filler and 20-30 parts of reinforcing fiber A21-5 parts by weight of nano amorphous carbon black, 3-5 parts by weight of fumed silica, 1-3 parts by weight of dimethyl silicone oil and 30-45 parts by weight of solvent A2；
The component B of the high-temperature resistant coating comprises the following raw materials: 25-30 parts by weight of curing agent B2And 10 to 30 parts by weight of a solvent B2The curing agent B2Is a polyamide-based curing agent 650 and/or a curing agent 651.
Further, the thickness ratio of the temperature-resistant layer to the heat insulation layer is 5-10: 4 to 7.
Further, the polyol is one or more of polyethylene glycol 6000, polyglycerol 4000 and polypentaerythritol 4000.
Further, the low-density filler is one or more of hollow glass beads, nano ceramic hollow beads and silicon dioxide aerogel, and the diameter of the low-density filler is 50-70 microns.
Further, the isocyanate is hexamethylene diisocyanate and/or isophorone diisocyanate;
the reinforcing fiber A1Is one or more mixture of cellulose acetate and hydroxyethyl cellulose, the reinforcing fiber A1The diameter is 50-60 microns, and the length is 3-4 mm.
Further, the coupling agent is KH-550 and/or KH-560, and the solvent A is1The solvent B1The solvent A2And the solvent A2All are one or more of ethyl acetate, butyl acetate, butanone, acetone and xylene.
Further, the high-temperature resistant resin is one or two of epoxy resin E-44 and epoxy resin E-51;
the ablation-resistant filler is one or more of silicon micropowder, kaolin, sepiolite and mica powder, and the mesh number of the ablation-resistant filler is 1000-1500 meshes;
the reinforcing fiber A2For modifying carbon fibres with organosiliconAnd one or more of carbon fibers, the reinforcing fibers A2The diameter is 50-60 microns, and the length is 3-4 mm;
the polycarbonate Mn is 3000-;
the mesh number of the fumed silica is 700-900 meshes.
The organic silicon resin is methyl phenyl polysiloxane resin.
Another aspect of the invention relates to a method for preparing a high performance ablation-resistant coating, comprising the steps of:
(1) weighing raw materials of the component A of the heat-insulating coating according to the weight part, and uniformly mixing and stirring to obtain the component A of the heat-insulating coating;
(2) weighing raw materials of the heat-insulating coating B component according to the weight part, mixing and stirring uniformly to obtain the heat-insulating coating B component, fully and uniformly stirring the heat-insulating coating A component and the heat-insulating coating B component, coating the mixture on the surface of a base material through a spraying or brushing construction process, and drying at room temperature for 40-50 hours to obtain a heat-insulating layer;
(3) weighing raw materials of the component A of the high-temperature resistant coating according to the weight part, and uniformly mixing and stirring to obtain the component A of the high-temperature resistant coating;
(4) weighing raw materials of the high-temperature-resistant coating B component according to the weight part, mixing and stirring uniformly to prepare the high-temperature-resistant coating B component, then uniformly stirring the high-temperature-resistant component A and the high-temperature-resistant component B, coating a temperature-resistant layer on the upper side of the heat-insulating layer through a spraying or brushing construction process, and drying at room temperature for 40-50 hours to obtain the high-performance ablation-resistant coating.
Furthermore, the preparation steps of the organic silicon modified carbon fiber comprise the steps of treating the carbon fiber in a muffle furnace at 350-450 ℃ for 20-40 minutes, and then placing the carbon fiber in a mixed solution of a coupling agent and a solvent for immersion modification.
Further, the stirring speed of the step (1) is 3000-5000 r/min, and the stirring time is 1-2 hours;
the stirring speed of the step (2) is 1000-3000 r/min, and the stirring time is 0.5-1 hour;
the stirring speed of the step (3) is 2000-6000 r/min, and the stirring time is 1-2 hours;
the stirring speed of the step (4) is 2000-4000 r/min, and the stirring time is 0.5-1 hour.
Compared with the prior art, the invention has the following advantages:
(1) the high-performance ablation-resistant coating is successfully prepared by adopting a double-layer structure, the temperature-resistant layer with special characteristics is combined with the heat-insulating layer, so that the functional structure of the coating is more definite, the temperature-resistant layer structure can form a compact carbon layer structure in the ablation process, the heat-insulating effect of the coating can be favorably improved, and the problems of overlarge specific gravity of the filler and the like in the prior art are solved.
(2) According to the invention, the toughness of the temperature resistant layer and the heat insulation layer is greatly improved by introducing the polycarbonate and the polyol, and meanwhile, the carbon forming rate of the coating is improved by introducing the polycarbonate in the ablation process, so that the coating can block the external heat flow temperature and protect devices in the substrate.
(3) The coating has excellent ablation resistance and heat insulation performance by filling different ablation-resistant fillers and low-density fillers; meanwhile, the introduction of the reinforced fibers enables a three-dimensional skeleton structure to be formed inside the coating, so that the phenomenon that the coating is peeled off after ablation is effectively avoided, and the repairability of the coating is improved.
The coating is composed of a double-layer structure, the outer layer is a temperature-resistant coating, and the coating mainly comprises a high-temperature-resistant matrix and a high-temperature-resistant filler. The inner layer is a heat insulation coating and mainly comprises a heat insulation matrix and low-density filler. The invention can resist the transient high temperature of more than 1500 ℃, effectively blocks the external heat flow to protect the devices in the base material, still has good repairable performance after being washed by the heat flow for many times, and has stronger practical application value.
Detailed description of the preferred embodiments
The invention is further described in detail by the following specific embodiments, wherein the raw materials are all industrial products, the equipment is the production equipment of general polymer coatings, and the raw material parts are parts by weight except for special description.
Example 1:
60 parts by weight of methyl phenyl polysiloxane resin, 10 parts by weight of polyethylene glycol 6000, 1 part by weight of Hexamethylene Diisocyanate (HDI), 30 parts by weight of hollow glass microspheres, 15 parts by weight of cellulose acetate, 1 part by weight of nano amorphous carbon black, 1 part by weight of dimethyl silicone oil, 1 part by weight of KH-550 and 20 parts by weight of ethyl acetate are stirred at a constant rotating speed of 3000r/min for 1 hour to prepare a component A of the heat-insulating coating. And stirring 3 parts by weight of ethyl orthosilicate, 0.5 part by weight of dibutyltin dilaurate and 15 parts by weight of ethyl acetate at a constant rotation speed of 1000r/min for 0.5 hour to obtain a heat-insulating coating B component, fully and uniformly stirring the heat-insulating A component and the heat-insulating B component, coating the mixture on the surface of a base material through a spraying or brushing construction process, and drying the mixture at room temperature for 48 hours to obtain a heat-insulating layer.
50 parts by weight of epoxy resin E-44, 10 parts by weight of polycarbonate, 20 parts by weight of silicon micropowder, 20 parts by weight of organic silicon modified carbon fiber, 1 part by weight of nano amorphous carbon black, 3 parts by weight of fumed silica, 1 part by weight of simethicone and 30 parts by weight of ethyl acetate are stirred at a constant rotating speed of 2000r/min for 1 hour to obtain a component A of the high-temperature resistant coating. 25 parts by weight of polyamide curing agent 650 and 10 parts by weight of ethyl acetate are mixed at a constant rotation speed of 2000r/min for 0.5 hour to prepare a high-temperature-resistant coating B component, the high-temperature-resistant A component and the high-temperature-resistant B component are uniformly stirred, a layer of temperature-resistant layer is coated on the upper side of the heat-insulating coating through a spraying or brushing construction process, and the high-performance ablation-resistant coating can be obtained after drying for 48 hours at room temperature. The thickness of the temperature-resistant layer is 3mm, and the thickness of the heat-insulating layer is 4 mm.
Example 2:
64 parts by weight of methyl phenyl polysiloxane resin, 13 parts by weight of polyglycerol 4000, 1.4 parts by weight of HDI, 36 parts by weight of nano ceramic hollow microspheres, 19 parts by weight of cellulose acetate, 1.3 parts by weight of nano amorphous carbon black, 1.3 parts by weight of dimethyl silicone oil, 1.3 parts by weight of KH-550 and 40 parts by weight of butyl acetate are stirred at a constant rotating speed of 4000r/min for 1 hour to prepare a component A of the heat-insulating coating. And stirring 4 parts by weight of ethyl orthosilicate, 0.7 part by weight of dibutyltin dilaurate and 20 parts by weight of butyl acetate at a constant rotating speed of 2000r/min for 0.5 hour to obtain a heat-insulating coating B component, fully and uniformly stirring the heat-insulating A component and the heat-insulating B component, coating the mixture on the surface of a base material through a spraying or brushing construction process, and drying the mixture at room temperature for 48 hours to obtain a heat-insulating layer.
54 parts by weight of epoxy resin E-44, 12 parts by weight of polycarbonate, 30 parts by weight of kaolin, 24 parts by weight of carbon fiber, 2 parts by weight of nano amorphous carbon black, 4 parts by weight of fumed silica, 2 parts by weight of simethicone and 38 parts by weight of butyl acetate are stirred at a constant rotating speed of 3000r/min for 1 hour to obtain a component A of the high-temperature-resistant coating. 27 parts by weight of polyamide curing agent 650 and 18 parts by weight of butyl acetate are mixed at a constant rotating speed of 3000r/min for 0.5 hour to prepare a high-temperature-resistant coating B component, then the high-temperature-resistant A component and the high-temperature-resistant B component are uniformly stirred, a layer of temperature-resistant layer is coated on the upper side of the heat-insulating coating through a spraying or brushing construction process, and the high-performance ablation-resistant coating can be obtained after drying for 48 hours at room temperature. The thickness of the temperature-resistant layer is 4mm, and the thickness of the heat-insulating layer is 5 mm.
Example 3:
68 parts by weight of methyl phenyl polysiloxane resin, 18 parts by weight of polypentaerythritol 4000, 1.8 parts by weight of isophorone diisocyanate (IPDI), 42 parts by weight of silica aerogel, 25 parts by weight of hydroxyethyl cellulose, 1.8 parts by weight of nano amorphous carbon black, 1.8 parts by weight of dimethyl silicone oil, 1.8 parts by weight of KH-560 and 50 parts by weight of a mixed solution of butanone and acetone are stirred at a constant rotating speed of 4000r/min for 2 hours to prepare a component A of the heat-insulating coating. And stirring 4 parts by weight of ethyl orthosilicate, 0.7 part by weight of stannous octoate and 23 parts by weight of a mixed solution of butanone and acetone at a constant rotating speed of 2000r/min for 1 hour to prepare a heat-insulating coating B component, fully and uniformly stirring the heat-insulating coating A component and the heat-insulating coating B component, coating the mixture on the surface of a base material through a spraying or brushing construction process, and drying the mixture at room temperature for 48 hours to obtain a heat-insulating layer.
Stirring 57 parts by weight of epoxy resin E-51, 13 parts by weight of polycarbonate, 40 parts by weight of sepiolite powder, 28 parts by weight of organic silicon modified carbon fiber, 4 parts by weight of nano amorphous carbon black, 4 parts by weight of fumed silica, 2 parts by weight of dimethyl silicone oil and 42 parts by weight of butanone and acetone mixed solution at a constant rotating speed of 5000r/min for 2 hours to obtain a component A of the high-temperature resistant coating. 28 parts by weight of polyamide curing agent 651 and 25 parts by weight of butanone and acetone mixed solution are mixed at a constant rotating speed of 3000r/min for 1 hour to prepare a high-temperature-resistant coating B component, then the high-temperature-resistant A component and the high-temperature-resistant B component are uniformly stirred, a layer of temperature-resistant layer is coated on the upper side of the heat-insulating coating through a spraying or brushing construction process, and the high-performance ablation-resistant coating can be obtained after drying for 48 hours at room temperature. The thickness of the temperature-resistant layer is 6mm, and the thickness of the heat-insulating layer is 7 mm.
Example 4:
70 parts by weight of methyl phenyl polysiloxane resin, 20 parts by weight of mixed resin of polyethylene glycol 6000, polyglycerol 4000 and polypentaerythritol 4000, 1 part by weight of a mixture of HDI and IPDI, 15 parts by weight of hollow glass beads, 15 parts by weight of nano ceramic hollow beads, 15 parts by weight of silica aerogel mixed filler, 20 parts by weight of mixed cellulose of cellulose acetate and hydroxyethyl cellulose, 2 parts by weight of nano amorphous carbon black, 2 parts by weight of dimethyl silicone oil, 1 part by weight of KH-550 and 1 part by weight of KH-560 mixed coupling agent, 20 parts by weight of ethyl acetate, 10 parts by weight of butyl acetate, 10 parts by weight of butanone, 10 parts by weight of acetone and 10 parts by weight of xylene mixed solution, and stirring the mixed solution at a constant rotating speed of 5000r/min for 2 hours to prepare the component A of the heat-insulating coating. And then stirring a mixed solution of 5 parts by weight of ethyl orthosilicate, 0.5 part by weight of dibutyltin dilaurate and 0.5 part by weight of stannous octoate, 10 parts by weight of ethyl acetate, 5 parts by weight of butyl acetate, 5 parts by weight of butanone, 5 parts by weight of acetone and 5 parts by weight of xylene at a constant rotating speed of 3000r/min for 1 hour to prepare a heat-insulating coating B component, fully and uniformly stirring the heat-insulating coating A component and the heat-insulating coating B component, coating the mixture on the surface of a base material through a spraying or brushing construction process, and drying the mixture at room temperature for 48 hours to obtain a heat-insulating layer.
40 parts of epoxy resin E-44, 20 parts of epoxy resin E-51, 15 parts of polycarbonate, 10 parts of silicon micropowder, 15 parts of kaolin, 15 parts of sepiolite and 5 parts of mica powder mixed filler, 30 parts of organic silicon modified carbon fiber and carbon fiber mixed fiber, 5 parts of nano amorphous carbon black, 5 parts of fumed silica, 3 parts of dimethyl silicone oil, 10 parts of ethyl acetate, 10 parts of butyl acetate, 10 parts of butanone, 10 parts of acetone and 5 parts of xylene mixed solution, and stirring at a constant rotating speed of 6000r/min for 2 hours to obtain the component A of the high-temperature-resistant coating. Mixing 30 parts by weight of polyamide curing agent 650 and curing agent 651 with 10 parts by weight of ethyl acetate, 5 parts by weight of butyl acetate, 5 parts by weight of butanone, 5 parts by weight of acetone and 5 parts by weight of xylene to obtain a mixed solution, stirring the high-temperature-resistant component A and the high-temperature-resistant component B uniformly at a constant rotation speed of 4000r/min for 1 hour, coating a layer of temperature-resistant layer on the upper side of the heat-insulating coating through a spraying or brushing construction process, and drying at room temperature for 48 hours to obtain the high-performance ablation-resistant coating. The thickness of the temperature-resistant layer is 6mm, and the thickness of the heat-insulating layer is 8 mm.
The performance of the high-performance ablation-resistant coatings prepared in examples 1 to 4 was tested, and the results are shown in Table 1, the thermal conductivity was 0.19 to 0.26 w/m.k, and the thermal insulation effect of the coatings was good. The ablation rate of the wire is 0.17-0.29mm/s, the peeling phenomenon of the coating after ablation can be effectively avoided, and the repairability of the coating is improved.
TABLE 1 test results for high Performance ablation resistant coatings prepared in examples 1-4
Claims (10)
1. A high-performance ablation-resistant coating is characterized in that: comprises an inner heat insulation layer and an outer temperature resistant layer;
the heat insulation layer is prepared from a heat insulation coating A component and a heat insulation coating B component;
the component A of the heat-insulating coating comprises the following raw materials: 60-70 parts of organic silicon resin, 10-20 parts of polyol, 1-2 parts of isocyanate, 30-45 parts of low-density filler and 15-30 parts of reinforcing fiber A11-2 parts by weight of nano amorphous carbon black, 1-2 parts by weight of dimethyl silicone oil, 1-2 parts by weight of coupling agent and 20-60 parts by weight of solvent A1；
The component B of the heat-insulating coating comprises the following raw materials: 3 to 5 parts by weight of ethyl orthosilicate B10.5 to 1 part by weightCatalyst, 15-25 parts by weight of solvent B1The catalyst is one or two of dibutyltin dilaurate and stannous octoate;
the temperature resistant layer is prepared from a high-temperature resistant coating A component and a high-temperature resistant coating B component;
the component A of the high-temperature resistant coating comprises the following raw materials: 50-60 parts of high-temperature-resistant resin, 10-15 parts of polycarbonate, 20-45 parts of ablation-resistant filler and 20-30 parts of reinforcing fiber A21-5 parts by weight of nano amorphous carbon black, 3-5 parts by weight of fumed silica, 1-3 parts by weight of dimethyl silicone oil and 30-45 parts by weight of solvent A2；
The component B of the high-temperature resistant coating comprises the following raw materials: 25-30 parts by weight of curing agent B2And 10 to 30 parts by weight of a solvent B2The curing agent B2Is a polyamide-based curing agent 650 and/or a curing agent 651.
2. The high performance ablation-resistant coating of claim 1, wherein: the thickness ratio of the temperature-resistant layer to the heat insulation layer is 5-10: 4 to 7.
3. The high performance ablation-resistant coating of claim 1, wherein: the polyalcohol is one or more of polyethylene glycol 6000, polyglycerol 4000 and polypentaerythritol 4000.
4. The high performance ablation-resistant coating of claim 1, wherein: the low-density filler is one or more of hollow glass beads, nano ceramic hollow beads and silicon dioxide aerogel, and the diameter of the low-density filler is 50-70 mu m.
5. The high performance ablation-resistant coating of claim 1, wherein: the isocyanate is hexamethylene diisocyanate and/or isophorone diisocyanate;
the reinforcing fiber A1Is one or more mixture of cellulose acetate and hydroxyethyl cellulose, the reinforcing fiber A1The diameter is 50-60 microns, and the length is 3-4 mm.
6. The high performance ablation-resistant coating of claim 1, wherein: the coupling agent is KH-550 and/or KH-560, and the solvent A1The solvent B1The solvent A2And the solvent A2All are one or more of ethyl acetate, butyl acetate, butanone, acetone and xylene.
7. The high performance ablation-resistant coating of claim 1, wherein: the high-temperature-resistant resin is one or two of epoxy resin E-44 and epoxy resin E-51;
the ablation-resistant filler is one or more of silicon micropowder, kaolin, sepiolite and mica powder, and the mesh number of the ablation-resistant filler is 1000-1500 meshes;
the reinforcing fiber A2The reinforcing fiber A is one or a mixture of organosilicon modified carbon fiber and carbon fiber2The diameter is 50-60 microns, and the length is 3-4 mm;
the polycarbonate Mn is 3000-5000;
the mesh number of the fumed silica is 700-900 meshes.
8. A method for preparing the high-performance ablation-resistant coating according to any one of claims 1 to 7, characterized by comprising the following steps:
(1) weighing raw materials of the component A of the heat-insulating coating according to the weight part, and uniformly mixing and stirring to obtain the component A of the heat-insulating coating;
(2) weighing raw materials of the heat-insulating coating B component according to the weight part, mixing and stirring uniformly to obtain the heat-insulating coating B component, fully and uniformly stirring the heat-insulating coating A component and the heat-insulating coating B component, coating the mixture on the surface of a base material through a spraying or brushing construction process, and drying at room temperature for 40-50 hours to obtain a heat-insulating layer;
(3) weighing raw materials of the component A of the high-temperature resistant coating according to the weight part, and uniformly mixing and stirring to obtain the component A of the high-temperature resistant coating;
(4) weighing raw materials of the high-temperature-resistant coating B component according to the weight part, mixing and stirring uniformly to prepare the high-temperature-resistant coating B component, then uniformly stirring the high-temperature-resistant component A and the high-temperature-resistant component B, coating a temperature-resistant layer on the upper side of the heat-insulating layer through a spraying or brushing construction process, and drying at room temperature for 40-50 hours to obtain the high-performance ablation-resistant coating.
9. The method of preparing the high performance ablation-resistant coating of claim 8, wherein: the preparation steps of the organic silicon modified carbon fiber comprise the steps of firstly treating the carbon fiber in a muffle furnace at 350-450 ℃ for 20-40 minutes, and then placing the carbon fiber in a mixed solution of a coupling agent and a solvent for dipping modification.
10. The method of preparing the high performance ablation-resistant coating of claim 8, wherein: the stirring speed of the step (1) is 3000-5000 r/min, and the stirring time is 1-2 hours;
the stirring speed of the step (2) is 1000-3000 r/min, and the stirring time is 0.5-1 hour;
the stirring speed of the step (3) is 2000-6000 r/min, and the stirring time is 1-2 hours;
the stirring speed of the step (4) is 2000-4000 r/min, and the stirring time is 0.5-1 hour.
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| CN113980345A (en) * | 2021-11-22 | 2022-01-28 | 航天特种材料及工艺技术研究所 | Method for improving ablation resistance of organic silicon aerogel |
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| CN115636967A (en) * | 2022-12-05 | 2023-01-24 | 北京玻钢院复合材料有限公司 | Environment-friendly ablation-resistant phenolic resin prepreg, composite material and preparation method |
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