Aerogel fire-retardant thermal insulation coating and preparation method thereof

Abstract

The application relates to the technical field of chemical coatings, and particularly discloses an aerogel flame-retardant heat-insulating and heat-preservation coating and a preparation method thereof. The aerogel flame-retardant heat-insulating and heat-preservation coating is made of raw materials containing the following components in parts by weight: deionized water 25-40 parts, cellulose 0.1-1.0 parts, building additives 4-10 parts, silicate flame retardant 15-30 parts, emulsion 20-35 parts, aerogel 0.5-3.0 parts and hollow glass microbeads 12-25 parts. The preparation method comprises the following steps: adding the cellulose into the deionized water and stirring and mixing, adding the building additives and the silicate flame retardant and stirring and mixing, then adding the emulsion and stirring and mixing, and finally adding the aerogel and the hollow glass microbeads and mixing uniformly to obtain the aerogel flame-retardant heat-insulating and heat-preservation coating. After the application of the aerogel flame-retardant heat-insulating and heat-preservation coating, the protective layer formed by the silicate flame retardant at high temperature can have better closing property, so that the excellent heat-insulating and heat-preservation performance and the flame-retardant performance can be simultaneously ensured.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of chemical coatings, in particular to an aerogel flame-retardant heat-insulating and heat-preservation coating and a preparation method thereof. BACKGROUND

[0002] The heat-insulating and heat-preservation coating can effectively inhibit and shield the radiant heat and heat conduction of infrared rays, and is realized through low thermal conductivity and high thermal resistance, and has wide application in building heat preservation, such as interior walls, exterior walls, roofs, basements, and heat insulation and energy saving of chemical equipment, such as storage tanks, reaction kettles and conveying pipelines.

[0003] With the frequent occurrence of fire accidents, the development of flame-retardant performance based on the heat-insulating and heat-preservation coating is increasingly valued. Through the improvement of flame-retardant performance, the flame spreading speed can be slowed down, and the combustion can be prevented for a certain period of time, thereby providing time for extinguishing the fire. The heat-insulating and heat-preservation coating uses functional fillers in the mixed matrix to play the heat-insulating and heat-preservation performance, and then introduces flame retardants on this basis to further play the flame-retardant performance. For example, the patent application file with the publication number CN116254030A discloses a high-molecular polymer emulsion intumescent fireproof coating and a preparation process thereof. The high-molecular polymer emulsion intumescent fireproof coating is composed of raw materials: high-molecular emulsion film-forming material, intumescent flame retardant, non-intumescent inorganic heat-insulating filler, reinforcing fiber, deionized water, coupling agent, thickening agent, stabilizer and nano rare earth oxide.

[0004] According to the related technology in the above, the inventors believe that the mechanism of the coating flame retardant is to react at high temperature to form a protective layer on the surface of the material to prevent oxygen from entering the interior of the material, thereby preventing combustion; and the heat-insulating and heat-preservation filler is difficult to form a mixed system with uniform distribution and good compatibility with the flame retardant, which leads to poor closure performance of the protective layer formed by the application of the flame retardant, and it is difficult to achieve the expected flame-retardant effect.

[0005] Therefore, there is an urgent need to propose a scheme to solve the above technical problems. SUMMARY

[0006] In order to solve the problem of poor flame-retardant performance of the existing heat-insulating and heat-preservation coating, the application provides an aerogel flame-retardant heat-insulating and heat-preservation coating and a preparation method thereof.

[0007] In a first aspect, the application provides an aerogel flame-retardant heat-insulating and heat-preservation coating, which adopts the following technical scheme:

[0008] An aerogel flame-retardant heat-insulating and heat-preservation coating is made of raw materials containing the following weight parts:

[0009] 25-40 parts of deionized water;

[0010] cellulose 0.1-1.0 parts;

[0011] building aids 4-10 parts;

[0012] silicate flame retardant 15-30 parts;

[0013] emulsion 20-35 parts;

[0014] aerogel 0.5-3.0 parts;

[0015] hollow glass microspheres 12-25 parts.

[0016] By adopting the technical scheme, the aerogel, as a light nanometer porous amorphous solid material, can play an excellent heat insulation performance in the coating, by reducing solid heat conduction, inhibiting air convection heat transfer and effectively blocking radiation heat conduction; the hollow glass microsphere is a closed hollow spherical particle, which contains a thin gas inside, and has a low thermal conductivity, so it can provide excellent heat insulation effect; the aerogel and the hollow glass microsphere are used in combination, so that the aerogel flame-retardant heat-insulating and heat-preservation coating can realize good heat insulation effect after application. The main component of the silicate flame retardant is inorganic silicate, which can effectively prevent heat from being conducted from the flame to the protected material, and also can prevent oxygen from diffusing to the combustion area, thereby reducing or delaying the combustion process, so as to realize the flame-retardant effect. In the aerogel flame-retardant heat-insulating and heat-preservation coating, the silicate flame retardant, the aerogel and the hollow glass microsphere are used in combination, the adsorption and conduction effects brought by the nanometer pore structure of the aerogel are utilized, so that when the silicate flame retardant reacts at high temperature, the reaction product can be uniformly and rapidly spread through the pore structure of the aerogel, and the hollow glass microsphere plays a bearing role in this process, so that the reaction product has better flowability and dispersibility, so that the protective layer formed by the silicate flame retardant can have better closure, thereby bringing stronger flame-retardant effect, so as to ensure that the aerogel flame-retardant heat-insulating and heat-preservation coating can have excellent heat insulation and heat preservation performance and flame-retardant performance, and has excellent overall application quality.

[0017] Preferably, 3-7 parts by weight of a functional aid is further added to the raw material of the aerogel flame-retardant heat-insulating and heat-preservation coating, the functional aid is composed of modified emulsified wax and modified polyimide hollow fiber, and the weight ratio of the modified emulsified wax and the modified polyimide hollow fiber is 1:(1.6-2.4);

[0018] The modified emulsified wax is prepared by the following steps:

[0019] The paraffin raw material and graphene powder are mixed in a weight ratio of (20-30):1, heated, melted, mixed uniformly, then emulsifier and glycerol are added, water is added during stirring, mixed uniformly, and then cooled to obtain modified emulsified paraffin;

[0020] The modified polyimide hollow fiber is prepared by the following steps:

[0021] The polyimide hollow fiber raw material is placed in a reaction solution and stirred to react, the reaction solution is obtained by mixing beta-cyclodextrin, 1,2,3,4-butanetetracarboxylic acid, sodium hypophosphite and water in a weight ratio of (0.15-0.18):(0.08-0.10):(0.03-0.04):1, and then dried after the reaction to obtain the modified polyimide hollow fiber.

[0022] By using the above technical scheme, in the preparation of the modified emulsified paraffin, the use of graphene can reduce the crystallinity of paraffin, so that the obtained modified emulsified paraffin exhibits excellent fluidity; when the modified emulsified paraffin is applied to the coating, it can utilize its own molecular lubrication effect, when the silicate flame retardant reacts at high temperature, through the carbonization of graphene, the carbon layer is used to strengthen the protective layer formed by the silicate flame retardant, and a better complementary effect is brought to the closure of the protective layer, so as to ensure the play of more excellent flame retardant effect.

[0023] In the preparation of the modified polyimide hollow fiber, by using beta-cyclodextrin, 1,2,3,4-butanetetracarboxylic acid and sodium hypophosphite, the obtained modified polyimide hollow fiber exhibits excellent hydrophilicity and dispersibility, and can be fully dispersed in the coating; when the modified polyimide hollow fiber is applied to the coating, it can strengthen the conduction and dispersion of the reaction product of the silicate flame retardant at high temperature, thereby improving the flame retardant performance.

[0024] At the same time, when the modified emulsified paraffin and the modified polyimide hollow fiber are used as functional additives, the treatment can bring the above effects, and the carbon layer structure formed at high temperature relies on the surface of the modified polyimide hollow fiber, in addition to the strengthening and complementary effect of the protective layer formed by the silicate flame retardant, it can also act as a skeleton support to maintain the stability and integrity of the closed protective layer structure, thereby significantly improving the performance of the flame retardant effect, so that the application quality of the aerogel flame-retardant thermal-insulation coating can be significantly improved.

[0025] Preferably, the weight ratio of the modified emulsified paraffin and the modified polyimide hollow fiber is 1:2.

[0026] By adopting the above technical scheme, the modified emulsified paraffin and the modified polyimide hollow fiber with the above weight ratio play a more excellent cooperation effect when applied, and the flame-retardant performance of the aerogel flame-retardant thermal insulation coating is also better improved.

[0027] Preferably, the silicate flame retardant is pretreated before use, and the pretreatment step is as follows:

[0028] The silicate flame retardant is placed in a sodium stearate solution with a mass fraction of 4-6%, and the solid-liquid ratio of the silicate flame retardant and the sodium stearate solution is 1g:(3-5mL). After being treated at 75-85℃ for 70-80min, it is taken out and dried to obtain the pretreated silicate flame retardant.

[0029] By adopting the above technical scheme, the silicate flame retardant is modified as described above, so that the sodium stearate reacts with the non-bridging hydroxyl groups on the surface of the silicate or is adsorbed on the surface, which can reduce the agglomeration of the silicate flame retardant and has high dispersion stability. At the same time, the pretreated silicate flame retardant can form a uniformly distributed and compatible mixed system with aerogel and hollow glass microspheres, thereby playing a more excellent flame-retardant performance in subsequent application process and greatly improving the flame-retardant performance of the aerogel flame-retardant thermal insulation coating.

[0030] Preferably, the aerogel is silica aerogel with a particle size of 20-50nm, and the hollow glass microspheres have a particle size of 30-100pm.

[0031] By adopting the above technical scheme, the silica aerogel and hollow glass microspheres with the above specifications can not only play an excellent and stable thermal insulation effect when applied, but also cooperate with the silicate flame retardant that reacts at high temperature to play a corresponding role, thereby bringing about a more excellent and stable flame-retardant performance, and being conducive to obtaining an aerogel flame-retardant thermal insulation coating with excellent application quality.

[0032] Preferably, the building aid is one or a combination of several of film-forming aids, wetting agents, dispersants, defoaming agents, preservatives, bactericides, antifreezes and thickening agents.

[0033] By adopting the above technical scheme, the building aids of the above types are all suitable for the mixed system of the aerogel flame-retardant thermal insulation coating, and can fully play their own roles. At the same time, they can also be selected and combined according to the needs of actual application scenarios, thereby improving the diversity of the application of the aerogel flame-retardant thermal insulation coating.

[0034] Preferably, the emulsion is one or a combination of several of acrylate emulsion, VAE emulsion, styrene-butadiene emulsion, polyvinyl acetate emulsion, styrene-modified acrylate emulsion, water-based fluorocarbon resin emulsion and water-based polyurethane emulsion.

[0035] By adopting the technical scheme, according to different application environments and scenes, one or a combination of the above components can be selected as an emulsion, and all of them can be used for the excellent effect of the combination of silicate flame retardant, aerogel and hollow glass microspheres, and thus an excellent and stable aerogel flame-retardant thermal insulation coating is obtained.

[0036] In a second aspect, the application provides a preparation method of an aerogel flame-retardant thermal insulation coating, which adopts the following technical scheme:

[0037] A preparation method of an aerogel flame-retardant thermal insulation coating, comprising the following steps:

[0038] (1) Prepare raw materials including deionized water, cellulose, building additives, silicate flame retardant, emulsion, aerogel and hollow glass microspheres according to the proportion;

[0039] (2) The cellulose in step (1) is added to the deionized water and stirred and mixed, then the building additives and the silicate flame retardant are added and stirred and mixed, then the emulsion is added and stirred and mixed, and finally the aerogel and the hollow glass microspheres are added and mixed uniformly to obtain the aerogel flame-retardant thermal insulation coating.

[0040] By adopting the technical scheme, the above method is simple to operate, and the raw materials are mixed in steps, which is beneficial to quality control during operation, and is not only suitable for large-scale industrial production, but also beneficial to obtaining an aerogel flame-retardant thermal insulation coating with excellent and stable quality.

[0041] In summary, the application has the following beneficial effects:

[0042] 1. The application uses silicate flame retardant, aerogel and hollow glass microspheres for combination, and the reaction products of the silicate flame retardant at high temperature are uniformly and rapidly spread, and thus the protective layer formed by the silicate flame retardant shows better closure, so that the expected flame-retardant effect can be more easily achieved, and finally an aerogel flame-retardant thermal insulation coating with excellent thermal insulation and flame-retardant performance is obtained.

[0043] 2、The functional aid agent composed of modified emulsified paraffin and modified polyimide hollow fiber can not only form a protective layer of silicate flame retardant with strengthening and supplementing effect, but also can act as a skeleton support to maintain the stability and integrity of the closed protective layer structure, thereby significantly improving the flame retardant performance of aerogel flame-retardant thermal insulation coating; 3, The pretreatment of silicate flame retardant before use can not only reduce the agglomeration of silicate flame retardant and improve the dispersion stability of silicate flame retardant, but also make the pretreated silicate flame retardant form a mixed system with aerogel and hollow glass microspheres which is uniformly distributed and has good compatibility, thereby making the aerogel flame-retardant thermal insulation coating have better flame-retardant performance after application. DETAILED DESCRIPTION

[0044] The application will be further described in detail below in combination with preparation examples, examples and comparative examples.

[0045] The raw materials used in each preparation example, example and comparative example of the application are commercially available, except for special instructions:

[0046] The cellulose is hydroxyethyl cellulose purchased from Jinan Kai Chuang Chemical Co., Ltd.;

[0047] The silicate flame retardant is BYK-MAX CT 4260 organic silicon flame retardant purchased from BYK;

[0048] The acrylate emulsion is BT-6509 purchased from Guangzhou Batai New Material Technology Co., Ltd.;

[0049] The film forming aid is alcohol ester twelve film forming aid purchased from Wuhan Runxingyuan Technology Co., Ltd.;

[0050] The dispersing agent is Dispex AA4140 purchased from BASF;

[0051] The defoaming agent is Tego Foamex 810 purchased from Yingchuangdige;

[0052] The paraffin raw material is 48# refined paraffin;

[0053] The graphene powder is industrial grade graphene with a particle size of 0.07mm purchased from Qingdao Heshinda Carbon Material Co., Ltd.;

[0054] The emulsifier is emulsifier NP-15 purchased from XingTai Xinlanxing Technology Co., Ltd.;

[0055] The polyimide hollow fiber raw material is S0T purchased from Jiangsu Xinnuo New Material Technology Co., Ltd.

[0056] Preparation example of raw material and / or intermediate

[0057] Preparation Example 1

[0058] A modified emulsified paraffin wax is prepared by the following steps:

[0059] The paraffin wax raw material and graphene powder are mixed in a weight ratio of 25:1, heated to 85°C to melt and mix uniformly, then the emulsifier and glycerol are added, and water is added during stirring at 600 r / min. After mixing uniformly for 10 min, the temperature is lowered to room temperature (25°C) to obtain the modified emulsified paraffin wax.

[0060] Note: In the above operation, the amount of emulsifier is 35% of the weight of the paraffin wax raw material, the amount of glycerol is 5% of the weight of the paraffin wax raw material, and the amount of water is 40% of the weight of the paraffin wax raw material.

[0061] Preparation Example 2

[0062] A modified emulsified paraffin wax differs from Preparation Example 1 in that the weight ratio of paraffin wax raw material to graphene powder is 20:1.

[0063] Preparation Example 3

[0064] A modified emulsified paraffin wax differs from Preparation Example 1 in that the weight ratio of paraffin wax raw material to graphene powder is 30:1.

[0065] Preparation Example 4

[0066] A modified polyimide hollow fiber is prepared by the following steps:

[0067] The polyimide hollow fiber raw material is placed in a reaction solution and stirred at 200 r / min for 2h. The reaction solution is obtained by mixing β-cyclodextrin, 1,2,3,4-butanetetracarboxylic acid, sodium hypophosphite, and water in a weight ratio of 0.165:0.09:0.035:1. After the reaction, the product is dried at 100°C for 5 min to obtain the modified polyimide hollow fiber.

[0068] Note: In the above operation, the weight ratio of the polyimide hollow fiber raw material to the reaction solution is 1:10.

[0069] Preparation Example 5

[0070] A modified polyimide hollow fiber differs from Preparation Example 4 in that the reaction solution is obtained by mixing β-cyclodextrin, 1,2,3,4-butanetetracarboxylic acid, sodium hypophosphite, and water in a weight ratio of 0.15:0.08:0.03:1.

[0071] Preparation Example 6

[0072] A modified polyimide hollow fiber, which is different from Preparation Example 4 in that a reaction solution is obtained by mixing β-cyclodextrin, 1,2,3,4-butanetetracarboxylic acid, sodium hypophosphite, and water in a weight ratio of 0.18:0.10:0.04:1.

[0073] Preparation Example 7

[0074] A pretreated silicate flame retardant, which is prepared from a silicate flame retardant by the following pretreatment step:

[0075] The silicate flame retardant is placed in a 5% sodium stearate solution by mass, and the solid-liquid ratio of the silicate flame retardant and the sodium stearate solution is 1 g:4 mL. After being treated at 80°C for 75 min, it is taken out, and after being dried at 100°C for 5 min, the pretreated silicate flame retardant is obtained.

[0076] Preparation Example 8

[0077] A pretreated silicate flame retardant, which is different from Preparation Example 7 in that it is prepared from a silicate flame retardant by the following pretreatment step:

[0078] The silicate flame retardant is placed in a 4% sodium stearate solution by mass, and the solid-liquid ratio of the silicate flame retardant and the sodium stearate solution is 1 g:5 mL. After being treated at 75°C for 80 min, it is taken out, and after being dried at 100°C for 5 min, the pretreated silicate flame retardant is obtained.

[0079] Preparation Example 9

[0080] A pretreated silicate flame retardant, which is different from Preparation Example 7 in that it is prepared from a silicate flame retardant by the following pretreatment step:

[0081] The silicate flame retardant is placed in a 6% sodium stearate solution by mass, and the solid-liquid ratio of the silicate flame retardant and the sodium stearate solution is 1 g:3 mL. After being treated at 85°C for 70 min, it is taken out, and after being dried at 100°C for 5 min, the pretreated silicate flame retardant is obtained.

[0082] Example

[0083] Example 1

[0084] An aerogel flame-retardant thermal insulation coating, which is prepared from raw materials whose weights are shown in Table 1, and is prepared by the following steps:

[0085] (1) Prepare raw materials including deionized water, cellulose, building aids, silicate flame retardants, emulsions, aerogels, and hollow glass microspheres according to the proportions;

[0086] (2) The cellulose in step (1) is added to deionized water, stirred and mixed at 300 r / min for 5 min, then building additives and silicate flame retardants are added and stirred and mixed at 500 r / min for 10 min, then the emulsion is added and stirred and mixed at 500 r / min for 10 min, and finally the aerogel and hollow glass microspheres are added and stirred at 1500 r / min for 30 min to obtain an aerogel flame-retardant thermal insulation coating.

[0087] Note: The building additives are film-forming additives, dispersants and defoamers in a weight ratio of 4:3:1; the emulsion is an acrylate emulsion; the aerogel is a silica aerogel with a particle size of 35 nm; and the hollow glass microspheres have a particle size of 65 μm.

[0088] Example 2-3

[0089] An aerogel flame-retardant thermal insulation coating, which differs from Example 1 in that the weights of the raw materials used in its preparation are as shown in Table 1.

[0090] Table 1 Raw materials used in the preparation of Examples 1-3 and their corresponding weights (kg / portion)

[0091] Raw materials Example 1 Example 2 Example 3 Deionized water 32.5 25 40 Cellulose 0.55 0.1 0.0 Construction aid 7 4 10 Silicate flame retardant 22.5 15 30 Emulsion 27.5 20 35 Aerogel 1.75 0.5 3.0 Hollow glass microspheres 18.5 12 25

[0092] Example 4

[0093] An aerogel flame-retardant thermal insulation coating, which differs from Example 1 in that the aerogel is a silica aerogel with a particle size of 20 nm; and the hollow glass microspheres have a particle size of 30 μm.

[0094] Example 5

[0095] An aerogel flame-retardant thermal insulation coating, which differs from Example 1 in that the aerogel is a silica aerogel with a particle size of 50 nm; and the hollow glass microspheres have a particle size of 100 μm.

[0096] Example 6

[0097] An aerogel flame-retardant thermal insulation coating, which differs from Example 1 in that a functional additive with a weight of 5 portions is added to the raw materials of the aerogel flame-retardant thermal insulation coating, the functional additive being composed of modified emulsified paraffin and modified polyimide hollow fibers in a weight ratio of 1:2, the modified emulsified paraffin being obtained from Preparation Example 1 and the modified polyimide hollow fibers being obtained from Preparation Example 4, and the functional additive being added together with the aerogel and the hollow glass microspheres in the preparation of the aerogel flame-retardant thermal insulation coating.

[0098] Example 7

[0099] An aerogel flame-retardant thermal insulation coating, which differs from Example 6 in that the weight of the functional additive added is 3 portions.

[0100] Example 8

[0101] An aerogel fire-retardant thermal insulation coating, different from Example 6 is that the functional auxiliary agent is added in a weight of 7 parts.

[0102] Example 9

[0103] An aerogel fire-retardant thermal insulation coating, different from Example 6 is that the functional auxiliary agent is composed of modified emulsified paraffin and modified polyimide hollow fiber in a weight ratio of 1:1.6.

[0104] Example 10

[0105] An aerogel fire-retardant thermal insulation coating, different from Example 6 is that the functional auxiliary agent is composed of modified emulsified paraffin and modified polyimide hollow fiber in a weight ratio of 1:2.4.

[0106] Example 11

[0107] An aerogel fire-retardant thermal insulation coating, different from Example 6 is that the functional auxiliary agent does not use modified emulsified paraffin.

[0108] Example 12

[0109] An aerogel fire-retardant thermal insulation coating, different from Example 6 is that the functional auxiliary agent does not use modified polyimide hollow fiber.

[0110] Example 13

[0111] An aerogel fire-retardant thermal insulation coating, different from Example 6 is that the modified emulsified paraffin is obtained from Preparation Example 2.

[0112] Example 14

[0113] An aerogel fire-retardant thermal insulation coating, different from Example 6 is that the modified emulsified paraffin is obtained from Preparation Example 3.

[0114] Example 15

[0115] An aerogel fire-retardant thermal insulation coating, different from Example 6 is that the modified polyimide hollow fiber is obtained from Preparation Example 5.

[0116] Example 16

[0117] An aerogel fire-retardant thermal insulation coating, different from Example 6 is that the modified polyimide hollow fiber is obtained from Preparation Example 6.

[0118] Example 17

[0119] An aerogel fire-retardant thermal insulation coating, which is different from Example 1 in that the silicate fire-retardant is replaced by an equal amount of pretreated silicate fire-retardant, and the pretreated silicate fire-retardant is obtained from Preparation Example 7.

[0120] Example 18

[0121] An aerogel fire-retardant thermal insulation coating, which is different from Example 17 in that the pretreated silicate fire-retardant is obtained from Preparation Example 8.

[0122] Example 19

[0123] An aerogel fire-retardant thermal insulation coating, which is different from Example 17 in that the pretreated silicate fire-retardant is obtained from Preparation Example 9.

[0124] Comparative Example

[0125] Comparative Example 1

[0126] An aerogel fire-retardant thermal insulation coating, which is different from Example 1 in that the aerogel is replaced by an equal amount of hollow glass microspheres.

[0127] Comparative Example 2

[0128] An aerogel fire-retardant thermal insulation coating, which is different from Example 1 in that the hollow glass microspheres are replaced by an equal amount of aerogel.

[0129] Comparative Example 3

[0130] An aerogel fire-retardant thermal insulation coating, which is different from Example 1 in that the hollow glass microspheres and the aerogel are replaced by an equal amount of expanded perlite.

[0131] Comparative Example 4

[0132] An aerogel fire-retardant thermal insulation coating, which is different from Example 1 in that the hollow glass microspheres and the aerogel are replaced by an equal amount of quartz powder.

[0133] Performance test test samples: the aerogel fire-retardant thermal insulation coatings obtained from Examples 1-19 are used as test samples 1-19, and the aerogel fire-retardant thermal insulation coatings obtained from Comparative Examples 1-4 are used as control samples 1-4.

[0134] Test method:

[0135] (1) Thermal insulation performance test: the thermal conductivity of test samples 1-19 and control samples 1-4 is tested according to the requirements in standard GB / T10295-2008 "Determination of Steady-state Thermal Resistance and Related Properties of Thermal Insulation Materials by Heat Flow Meter Method", and when the thermal conductivity is ≤0.035, it indicates that the aerogel fire-retardant thermal insulation coating has excellent thermal insulation performance.

[0136] (2) Combustion performance test, according to the requirements of GB / T14402-2007 "Determination of Combustion Heat Value of Building Materials and Products", GB / T20284-2006 "Single Combustion Test of Building Materials or Products", GB 8624-2012 "Classification of Building Materials and Products Combustion Performance" to test the test samples 1-19 and the control samples 1-4 for the fire growth rate index (FIGRA 0.2mJ , W / s); wherein during single combustion, a 12mm thick calcium silicate board is used as a back plate, and the sample coating amount is 700g / m 2 ; the smaller the fire growth rate index, the more excellent the flame retardant performance.

[0137] Table 2 Test results of test samples 1-19 and control samples 1-4

[0138]

[0139] Combining Examples 1-3 and Comparative Examples 1-4 and Table 2, it can be seen that the use of silicate flame retardant in aerogel flame-retardant thermal insulation coating with aerogel and hollow glass microspheres can take into account the relatively excellent thermal insulation performance and flame retardant performance; at the same time, it is also found that if any one of aerogel and hollow glass microspheres is used alone as a thermal insulation filler, or other thermal insulation fillers such as expanded perlite and quartz powder are used, it is found that the flame retardant performance of the aerogel flame-retardant thermal insulation coating will be greatly discounted, and the fire growth rate index obtained by testing will be significantly larger, indicating that only when aerogel and hollow glass microspheres are used in combination, can the protective layer formed by the silicate flame retardant exhibit relatively prominent closure, and the flame retardant performance is relatively prominent.

[0140] Combining Examples 1 and Examples 6-16 and Table 2, it can be seen that by adding the functional aid composed of modified emulsified wax and modified polyimide hollow fiber, the flame retardant performance of the aerogel flame-retardant thermal insulation coating can be further improved, and the fire growth rate index obtained by the above test is also significantly reduced; at the same time, if any one of the modified emulsified wax and the modified polyimide hollow fiber is used alone as a functional aid, although it can bring improvement in flame retardant performance, the improvement effect is limited, and the sum of the improvement effects brought by the two alone is far less than the excellent effect brought by the combination of the two, thus it can be seen that the cooperation between the modified emulsified wax and the modified polyimide hollow fiber can bring significant progress effect.

[0141] It can be seen from the combination of Embodiments 1 and 17-19 and Table 2 that the present application can only improve the flame-retardant performance of the aerogel flame-retardant thermal insulation coating by pretreating the silicate flame retardant before use, which indicates that the pretreated silicate flame retardant can also form a mixed system with the aerogel and the hollow glass microspheres, which is uniformly distributed and has good compatibility, and thus can play a more flame-retardant effect.

[0142] The specific embodiments are only an explanation of the present application, which is not a limitation of the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. Aerogel fire-retardant thermal insulation paint, characterized in that, It is made from raw materials containing the following parts by weight: Deionized water 25-40 parts; Cellulose 0.1-1.0 parts; Building aid 4-10 parts; Silicate flame retardant 15-30 parts; Emulsion 20-35 parts; Aerogel 0.5-3.0 parts; Hollow glass microbeads 12-25 parts; Functional aid 3-7 parts; The functional aid is composed of modified emulsified paraffin and modified polyimide hollow fiber, and the weight ratio of modified emulsified paraffin and modified polyimide hollow fiber is 1:(1.6-2.4); Among them, the modified emulsified paraffin is prepared by the following steps: Take paraffin raw material and graphene powder with a weight ratio of (20-30):1, melt and mix uniformly after heating, add emulsifier and glycerol, add water during stirring, mix uniformly, and cool down to get modified emulsified paraffin; The modified polyimide hollow fiber is prepared by the following steps: Take polyimide hollow fiber raw material and put it in the reaction solution for stirring reaction, the reaction solution is obtained by mixing β-cyclodextrin, 1,2,3,4-butane tetracarboxylic acid, sodium hypophosphite and water with a weight ratio of (0.15-0.18):(0.08-0.10):(0.03-0.04):1, and then take out and dry after reaction to obtain modified polyimide hollow fiber.

2. The aerogel flame retardant heat insulating coating according to claim 1, characterized in that: The weight ratio of the modified emulsified paraffin and the modified polyimide hollow fiber is 1:

2.

3. The aerogel fire-retardant thermal insulation paint according to claim 1, characterized in that: The silicate flame retardant is pretreated before use, and the pretreatment steps are as follows: Put the silicate flame retardant in a 4-6% sodium stearate solution, and make the solid-liquid ratio of silicate flame retardant and sodium stearate solution 1g:(3-5mL), treat at 75-85℃ for 70-80min, then take out and dry to get pretreated silicate flame retardant.

4. The aerogel fire-retardant thermal insulation paint according to claim 1, characterized in that: The aerogel is silica aerogel with a particle size of 20-50nm; the particle size of the hollow glass microbead is 30-100μm.

5. The aerogel fire-retardant thermal insulation paint according to claim 1, characterized in that: The building aid is a combination of one or more of film forming aid, wetting agent, dispersant, defoamer, preservative, bactericide, antifreeze and thickening agent.

6. The aerogel fire-retardant thermal insulation paint according to claim 1, characterized in that: The emulsion is a combination of one or more of acrylate emulsion, VAE emulsion, styrene butadiene emulsion, polyvinyl acetate emulsion, styrene modified acrylate emulsion, water-based fluorocarbon resin emulsion and water-based polyurethane emulsion.

7. The process for the preparation of aerogel fire-retardant thermal insulation coating according to claim 1, characterized in that: Including the following steps: (1) Prepare raw materials containing deionized water, cellulose, building aid, silicate flame retardant, emulsion, aerogel, hollow glass microbead and functional aid according to the proportion; (2) Add cellulose in deionized water in step (1) and stir to mix, then add building aid and silicate flame retardant and stir to mix, then add emulsion and stir to mix, finally add aerogel and hollow glass microbead, and add functional aid together with aerogel and hollow glass microbead, mix uniformly to get aerogel flame-retardant thermal insulation coating.

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