Organic-inorganic compound flame-retardant coating material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of fireproof flame-retardant materials, and particularly discloses an organic-inorganic compound flame-retardant coating material as well as a preparation method and application thereof, the flame-retardant coating material comprises the following raw materials in parts by weight: 100 parts of a resin matrix, 10-50 parts of a flame retardant, 2-3 parts of a dispersing aid, 1-3 parts of a silane coupling agent, 20-40 parts of a curing agent and 20-40 parts of a diluent; wherein the flame retardant is formed by compounding an organic flame retardant and an inorganic flame retardant, and the weight ratio of the organic flame retardant to the inorganic flame retardant is (2-10): (8-40). The flame-retardant coating material provided by the invention is simple in preparation process, abandons toxic components, is easy to obtain raw materials, is easy for large-scale batch production, has efficient flame retardance and good adhesive force and stability, and is particularly suitable for fireproof protection of industrial equipment, building structures and electronic devices.

Description

Technical Field

[0001] The present invention belongs to the technical field of fireproof and flame-retardant materials, and particularly relates to an organic-inorganic compound flame-retardant coating material, its preparation method and application, which are applicable to the fire protection of industrial equipment, building structures and electronic devices. Background Art

[0003] Currently, flame-retardant coatings are mainly divided into two categories: organic and inorganic according to chemical composition. Organic flame-retardant coatings are centered around phosphides, nitrides and halogen compounds. Their advantages lie in high flame-retardant efficiency at low temperatures, strong adhesion to substrates and easy processing. For example, Patent Publication No. CN118772592A proposes using the reaction product of oxy-silane and (3-propylhydroxy) triphenylphosphonium halide as a flame retardant. This flame-retardant material has excellent flame-retardant performance, but its halogen component releases toxic gases during combustion, posing environmental and health risks. In addition, the heat resistance of organic flame-retardant coatings is poor and they are prone to failure at high temperatures, limiting their application in extreme environments. Inorganic flame-retardant coatings are mainly composed of inorganic materials such as aluminum hydroxide, silicate, phosphate, etc. (for example, Patent Publication No. CN106833259B uses a composite system of antimony trioxide and aluminum hydroxide), and have characteristics such as good high-temperature stability and environmental friendliness. However, their defects are also significant: the high density of the coating leads to an increase in the weight of the substrate, it is prone to cracking and failure under extreme thermal stress, and its compatibility with the organic matrix is poor, affecting the coating uniformity. For example, the flame-retardant performance of the coating in the above patent decreases significantly after long-term heat resistance, making it difficult to meet the requirements of long-term protection.

[0004] To overcome the limitations of a single system, researchers have tried to compound organic and inorganic flame retardants. For example, Patent Publication No. CN108864793A proposes compounding 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide with ammonium polyphosphate and calcium gluconate. This flame-retardant material has high flame-retardant efficiency and is harmless to the environment and the human body. However, the preparation of this flame-retardant material requires coating with a film coater and is not suitable for large-scale production and application.

[0005] In view of this, this invention is specifically proposed. Summary of the Invention

[0006] The object of the present invention is to overcome the above-mentioned disadvantages of the prior art, and provides an organic-inorganic composite flame retardant coating material, its preparation method and application, mainly used to solve the problems of environmental toxicity risk of halogen-containing components, insufficient synergistic effect of organic / inorganic composite systems, and complex processes that are difficult to scale up in the existing flame retardant coating technology. The present invention realizes the multi-scale synergistic effect of gas-phase flame retardancy in the organic phase and condensed-phase carbon layer in the inorganic phase by compounding triphenyl phosphate with ammonium polyphosphate and aluminum hydroxide according to a specific weight ratio, and completely abandons halogen and heavy metal components. While ensuring high-efficiency flame retardancy in the full temperature range, the operation is simplified through spraying or brushing processes, the adhesion and heat resistance of the coating are improved, and it has both environmental friendliness and industrial production feasibility, and is applicable to the fire protection of industrial equipment, building structures and electronic devices.

[0007] The object of the present invention is solved by the following technical solutions:

[0008] In the first aspect, the present invention provides an organic-inorganic composite flame retardant coating material, and the flame retardant coating material comprises raw materials in parts by weight as follows:

[0009] Resin matrix, 100 parts;

[0010] Flame retardant, 10-50 parts;

[0011] Dispersion aid, 2-3 parts;

[0012] Silane coupling agent, 1-3 parts;

[0013] Curing agent, 20-40 parts;

[0014] Diluent, 20-40 parts;

[0015] Among them, the flame retardant is formed by compounding an organic flame retardant and an inorganic flame retardant, and the weight ratio of the organic flame retardant to the inorganic flame retardant is (2-10):(8-40).

[0016] Further, the organic flame retardant is triphenyl phosphate, the inorganic flame retardants are ammonium polyphosphate and aluminum hydroxide, and the weight ratio of triphenyl phosphate, ammonium polyphosphate to aluminum hydroxide is (2-10):(2-15):(6-30).

[0017] Further, the resin matrix is an epoxy-modified silicone resin, the solid content is 30%-60%, and the epoxy value is 0.06 g / 100 g.

[0018] Further, the dispersion aid is BYK-110.

[0019] Further, the silane coupling agent is KH550.

[0020] Furthermore, the curing agent is a polyamide epoxy curing agent with an amine value of 160 mg KOH / g and a solid content of 50% - 70%.

[0021] The diluent is a mixture of xylene and butyl acetate, and the weight ratio of xylene to butyl acetate is (0.5 - 3):1.

[0022] In a second aspect, the present invention provides a method for preparing the above-mentioned organic-inorganic compounded flame retardant coating material, which specifically includes the following steps:

[0023] Step 1: Prepare a flame retardant coating pre-dispersion

[0024] According to the set weight ratio, add the resin matrix, flame retardant, dispersion aid, and silane coupling agent into a planetary ball mill, and ball mill at a speed of 160 r / min - 240 r / min for 2 h - 6 h to obtain a flame retardant coating pre-dispersion;

[0025] Step 2: Prepare the flame retardant coating material

[0026] Transfer the flame retardant coating pre-dispersion to a stirring tank, and add the set weight portions of the curing agent and diluent, and disperse at a speed of 1000 r / min - 1200 r / min for 0.5 h - 1 h, and mix evenly to obtain an organic-inorganic compounded flame retardant coating material.

[0027] In a third aspect, the present invention provides an application of the above-mentioned organic-inorganic compounded flame retardant coating material. The organic-inorganic compounded flame retardant coating material is applied to industrial equipment, building materials or electronic devices to form a fire protection layer after curing.

[0028] Specifically, adopt air spraying or brushing methods to evenly coat the flame retardant coating material on the surface of the substrate (with a thickness of 1 mm - 2 mm), and an organic-inorganic compounded flame retardant coating can be obtained after curing.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The flame retardant coating material provided by the present invention is compounded and cured by specific weight portions of resin matrix, flame retardant, dispersion aid, silane coupling agent, curing agent, and diluent, and has the following characteristics compared with the prior art:

[0031] One is having high - efficiency synergistic flame - retardant performance: The flame retardant used in the present invention is a compound of triphenyl phosphate, ammonium polyphosphate, and aluminum hydroxide in a specific weight ratio. During combustion, the organic flame retardant triphenyl phosphate releases PO· free radicals during pyrolysis, efficiently capturing the active free radicals (such as H / OH) in the combustion chain reaction, playing a flame - retardant role in the gas phase and inhibiting the combustion chain reaction; the inorganic flame retardant ammonium polyphosphate catalyzes dehydration to form carbon, and together with Al2O3 generated by the thermal decomposition of aluminum hydroxide, they jointly construct a three - dimensional dense ceramized carbon layer, forming a physical heat - insulation barrier, realizing the synergy of gas - solid dual - phase flame retardancy. As a result, the formed flame - retardant coating can rapidly form an efficient heat - insulation protective layer, significantly reducing the combustion temperature, thereby remarkably enhancing the overall flame - retardant performance of the coating material and effectively making up for the deficiencies of a single flame - retardant system.

[0032] Two is having excellent thermal stability: The inorganic flame retardant in the present invention endows the coating with good high - temperature stability. Even when exposed to an extremely high - temperature environment for a long time, the coating structure remains intact and will not decompose, deform, or fail due to high temperature. After testing, after being subjected to long - term high temperature (200°C, 100 h), the coating can still maintain its effective flame - retardant function and continuously provide reliable fire protection for the substrate.

[0033] Three is having good adhesion: The present invention selects epoxy - modified silicone resin as the matrix and adds a silane coupling agent. The formed flame - retardant coating shows good adhesion on the surfaces of various substrates such as titanium alloy, aluminum alloy, and composite materials. This is because a strong chemical bonding is formed between the coating and the substrate, effectively enhancing the bonding force between the coating and the substrate, ensuring that during long - term use, the flame - retardant coating will not show phenomena such as peeling or flaking, greatly guaranteeing the effectiveness and stability of the use of the flame - retardant coating and extending the service life of fire protection.

[0034] Four is simple process and easy for large - scale production: The preparation process of the present invention first uses the planetary ball - milling process to pre - disperse the raw materials, effectively improving the dispersion uniformity of the flame retardant in the resin matrix; then the flame - retardant coating is applied to the surface of the substrate by air spraying or brushing. This method is easy to operate, and the coating is uniform and dense, and can be applied to the preparation of flame - retardant coatings for complex parts. At the same time, the raw materials are widely sourced and easy to obtain. The entire preparation process does not require special equipment and complex processes, the cost is controllable, and it has the potential for large - scale engineering production and application, meeting the urgent market demand for high - efficiency and low - cost flame - retardant coatings.

[0035] Five is environmental friendliness: Different from traditional halogen - or heavy - metal - containing flame - retardant coatings, the present invention completely abandons halogen and heavy - metal components. During production and use, it will not release toxic or harmful gases or substances, reducing the potential harm to the environment and human health. Specific implementation mode

[0036] Here, exemplary embodiments will be described in detail. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. On the contrary, they are merely examples consistent with some aspects of the present invention detailed in the appended claims.

[0037] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in combination with relevant experiments.

[0038] Example 1

[0039] The organic-inorganic compounded flame-retardant coating material provided by the embodiment of the present invention, by weight, comprises 100 parts of resin matrix, 10 parts of flame retardant, 2 parts of dispersion aid, 1 part of silane coupling agent, 20 parts of curing agent, and 20 parts of diluent; wherein, the flame retardant is formed by compounding 2 parts of organic flame retardant and 8 parts of inorganic flame retardant.

[0040] Specifically, 100 parts of epoxy-modified silicone resin are selected as the resin matrix, with a solid content of 30% and an epoxy value of 0.06 g / 100 g.

[0041] 2 parts of triphenyl phosphate are selected as the organic flame retardant, and a mixture of 2 parts of ammonium polyphosphate and 6 parts of aluminum hydroxide is selected as the inorganic flame retardant.

[0042] 2 parts of BYK-110 from BYK Company are selected as the dispersion aid.

[0043] 1 part of KH550 is selected as the silane coupling agent.

[0044] The curing agent is selected as MD231 polyamide epoxy curing agent with a solid content of 50% and an amine value of 160 mgKOH / g, and the total amount is 20 parts.

[0045] The diluent is composed of xylene and butyl acetate mixed in a weight ratio of 1:1, and the total amount is 20 parts.

[0046] When preparing the above organic-inorganic compounded flame-retardant coating material in this embodiment, the following specific process is included:

[0047] 1) Prepare the flame-retardant coating pre-dispersion: By weight, add 100 parts of epoxy-modified silicone resin, 2 parts of triphenyl phosphate, 2 parts of ammonium polyphosphate, 6 parts of aluminum hydroxide, 2 parts of BYK-110, and 1 part of KH550 into a planetary ball mill, set the rotation speed of the planetary ball mill to 160 r / min, and after ball milling for 2 h, the flame-retardant coating pre-dispersion is obtained;

[0048] 2) Preparation of the flame-retardant coating material: Add the above-mentioned flame-retardant coating pre-dispersion into a stirring tank, and add 20 parts of MD231 polyamide epoxy curing agent and 20 parts of diluent (a mixture formed by 10 parts of xylene and 10 parts of butyl acetate), and disperse at a high speed for 0.5 h at a rotation speed of 1000 r / min, so as to obtain an organic-inorganic composite flame-retardant coating material.

[0049] Example 2

[0050] For the organic-inorganic composite flame-retardant coating material provided in the embodiment of the present invention, the raw materials are calculated by weight and include 100 parts of resin matrix, 25 parts of flame retardant, 2 parts of dispersion aid, 2 parts of silane coupling agent, 25 parts of curing agent and 20 parts of diluent; wherein, the flame retardant is formed by compounding 5 parts of organic flame retardant and 20 parts of inorganic flame retardant.

[0051] Specifically, 100 parts of epoxy-modified organosilicon resin are selected as the resin matrix, with a solid content of 40% and an epoxy value of 0.06 g / 100 g.

[0052] 5 parts of triphenyl phosphate are selected as the organic flame retardant, and a mixture of 5 parts of ammonium polyphosphate and 15 parts of aluminum hydroxide is selected as the inorganic flame retardant.

[0053] 2 parts of BYK-110 from BYK Company are selected as the dispersion aid.

[0054] 2 parts of KH550 are selected as the silane coupling agent.

[0055] The curing agent is selected as MD231 polyamide epoxy curing agent with a solid content of 55% and an amine value of 160 mg KOH / g, and the total amount is 25 parts.

[0056] The diluent is composed of xylene and butyl acetate mixed in a weight ratio of 2:1, and the total amount is 24 parts.

[0057] When preparing the above-mentioned organic-inorganic composite flame-retardant coating material in this embodiment, the following process is specifically included:

[0058] 1) Preparation of the flame-retardant coating pre-dispersion: By weight, add 100 parts of epoxy-modified organosilicon resin, 5 parts of triphenyl phosphate, 5 parts of ammonium polyphosphate, 15 parts of aluminum hydroxide, 2 parts of BYK-110 and 2 parts of KH550 into a planetary ball mill, set the rotation speed of the planetary ball mill to 180 r / min, and after ball milling for 4 h, the flame-retardant coating pre-dispersion is obtained;

[0059] 2) Preparation of the flame-retardant coating material: Add the above-mentioned flame-retardant coating pre-dispersion into a stirring tank, and add 25 parts of MD231 polyamide epoxy curing agent and 24 parts of diluent (a mixture formed by 16 parts of xylene and 8 parts of butyl acetate), and disperse at a high speed for 0.6 h at a rotation speed of 1100 r / min, so as to obtain an organic-inorganic composite flame-retardant coating material.

[0060] Example 3

[0061] The organic-inorganic compounded flame retardant coating material provided by the embodiment of the present invention, calculated by weight of raw materials, comprises 100 parts of resin matrix, 45 parts of flame retardant, 3 parts of dispersion aid, 3 parts of silane coupling agent, 30 parts of curing agent and 30 parts of diluent; wherein, the flame retardant is formed by compounding 10 parts of organic flame retardant and 35 parts of inorganic flame retardant.

[0062] Specifically, 100 parts of epoxy modified silicone resin is selected as the resin matrix, with a solid content of 50% and an epoxy value of 0.06 g / 100 g.

[0063] 10 parts of triphenyl phosphate is selected as the organic flame retardant, and a mixture of 15 parts of ammonium polyphosphate and 20 parts of aluminum hydroxide is selected as the inorganic flame retardant.

[0064] 3 parts of BYK-110 from BYK Company is selected as the dispersion aid.

[0065] 3 parts of KH550 is selected as the silane coupling agent.

[0066] The curing agent selected is MD231 polyamide epoxy curing agent with a solid content of 60% and an amine value of 160 mgKOH / g, and the total amount is 30 parts.

[0067] The diluent is composed of xylene and butyl acetate mixed in a weight ratio of 3:1, and the total amount is 40 parts.

[0068] When preparing the above organic-inorganic compounded flame retardant coating material in this embodiment, it specifically includes the following processes:

[0069] 1) Prepare the pre-dispersion of the flame retardant coating: Calculated by weight, add 100 parts of epoxy modified silicone resin, 10 parts of triphenyl phosphate, 15 parts of ammonium polyphosphate, 20 parts of aluminum hydroxide, 3 parts of BYK-110 and 3 parts of KH550 into a planetary ball mill, set the rotation speed of the planetary ball mill to 200 r / min, and after ball milling for 5 h, the pre-dispersion of the flame retardant coating is obtained;

[0070] 2) Prepare the flame retardant coating material: Add the above pre-dispersion of the flame retardant coating into a stirring tank, and add 30 parts of MD231 polyamide epoxy curing agent and 40 parts of diluent (a mixture formed by 30 parts of xylene and 10 parts of butyl acetate), and disperse at a high speed at a rotation speed of 1100 r / min for 0.8 h, thereby obtaining the organic-inorganic compounded flame retardant coating material.

[0071] Example 4

[0072] The organic-inorganic compounded flame retardant coating material provided by the embodiments of the present invention, in terms of parts by weight of raw materials, comprises 100 parts of resin matrix, 50 parts of flame retardant, 2.5 parts of dispersion aid, 3 parts of silane coupling agent, 40 parts of curing agent and 40 parts of diluent; wherein, the flame retardant is formed by compounding 10 parts of organic flame retardant and 40 parts of inorganic flame retardant.

[0073] Specifically, 100 parts of epoxy-modified organosilicon resin is selected as the resin matrix, with a solid content of 60% and an epoxy value of 0.06 g / 100 g.

[0074] 10 parts of triphenyl phosphate is selected as the organic flame retardant, and the inorganic flame retardant is a mixture of 10 parts of ammonium polyphosphate and 30 parts of aluminum hydroxide.

[0075] 2.5 parts of BYK-110 from BYK Company is selected as the dispersion aid.

[0076] 3 parts of KH550 is selected as the silane coupling agent.

[0077] The curing agent is MD231 polyamide epoxy curing agent with a solid content of 70% and an amine value of 160 mgKOH / g, and the total amount is 40 parts.

[0078] The diluent is composed of xylene and butyl acetate mixed in a weight ratio of 2:1, and the total amount is 24 parts.

[0079] When preparing the above-mentioned organic-inorganic compounded flame retardant coating material in this embodiment, the following process is specifically included:

[0080] 1) Prepare the flame retardant coating pre-dispersion: In terms of parts by weight, add 100 parts of epoxy-modified organosilicon resin, 10 parts of triphenyl phosphate, 15 parts of ammonium polyphosphate, 20 parts of aluminum hydroxide, 3 parts of BYK-110 and 3 parts of KH550 into a planetary ball mill, set the rotation speed of the planetary ball mill to 240 r / min, and after ball milling for 6 h, the flame retardant coating pre-dispersion is obtained;

[0081] 2) Prepare the flame retardant coating material: Add the above-mentioned flame retardant coating pre-dispersion into a stirring tank, and add 40 parts of MD231 polyamide epoxy curing agent and 24 parts of diluent (a mixture formed by 16 parts of xylene and 8 parts of butyl acetate), and disperse at a high speed at a rotation speed of 1200 r / min for 1 h, thereby obtaining the organic-inorganic compounded flame retardant coating material.

[0082] The formulations in the above-mentioned Examples 1 to 4 are shown in Table 1 below:

[0083] Table 1 Parameters and parts by weight of materials in Examples 1 to 4

[0084]

[0085] To detect the various properties of the flame-retardant coating material of the present invention, the inventors evenly sprayed the organic-inorganic composite flame-retardant coating materials obtained in Examples 1 to 4 on the surfaces of different substrates (including titanium alloy substrates, aluminum alloy substrates, and composite material substrates), and after curing, obtained the organic-inorganic composite flame-retardant coating. The limiting oxygen index, vertical burning test, limiting oxygen index after heat resistance, vertical burning test after heat resistance, and adhesion on different substrates of this flame-retardant coating were tested as follows:

[0086] Limiting oxygen index test method: The oxygen index of the flame-retardant coating material was tested according to the ISO 4589 standard.

[0087] Vertical burning test method: The vertical burning grade of the flame-retardant coating specimen was tested according to the UL-94 standard.

[0088] Heat resistance performance test method: The flame-retardant coating material was tested in an environmental test chamber according to GB / T 1735.

[0089] Adhesion test method: The flame-retardant coating specimen was tested according to the GB / T 5210 standard.

[0090] The test results are shown in Table 2 below:

[0091] Table 2 Test results of the flame-retardant coating performance of Examples 1 to 4

[0092]

[0093] From the test results in Table 2, it can be seen that the organic-inorganic composite flame-retardant coatings formed by compounding and curing in specific weight ratios in Examples 1 to 4 of the present invention have excellent performance in all aspects. Specifically as follows:

[0094] High-efficiency flame-retardant performance: The limiting oxygen index (LOI) > 26%, and the UL-94 vertical burning grade reaches V-0 to V-2 levels (where Examples 3 and 4 reach V-0 level), which is better than the requirements of the GB / T 2408-2021 standard for flame-retardant materials (LOI ≥ 24%). This benefits from the gas-phase free radical capture effect of triphenyl phosphate and the dense carbon layer synergistically constructed by ammonium polyphosphate / aluminum hydroxide, forming a multi-level flame-retardant barrier;

[0095] Outstanding high-temperature stability: After the heat resistance test at 200°C / 100 h, there are no cracking and powdering phenomena on the coating surface, the LOI remains > 25%, and the difference from before the heat resistance test is < 2% (only 0.8% decrease in Example 1); the UL-94 grade does not degrade. It shows that the Al2O3-P2O5 ceramicized structure formed by the inorganic flame-retardant phase at high temperature effectively stabilizes the carbon layer and overcomes the defect of thermal decomposition instability of traditional organic coatings;

[0096] Excellent interfacial adhesion: Tested by the cross-cut method according to GB / T 9286-2021, the adhesion of the coating on titanium alloy, aluminum alloy and composite material substrates is >7.5 MPa (up to 12.5 MPa), far exceeding the general requirement of ≥3 MPa for industrial protective coatings. This is attributed to the synergistic effect of the interfacial bonding between the strong polar groups of epoxy-modified silicone resin and KH550 silane coupling agent.

[0097] The above are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0098] It should be understood that the present invention is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. An organic-inorganic compound flame retardant coating material, characterized in that, The flame retardant coating material comprises the following raw materials in parts by weight: Resin matrix, 100 parts; Flame retardant, 10-50 parts; Dispersing aid, 2-3 parts; Silane coupling agent, 1 to 3 parts; Curing agent, 20-40 parts; Diluent, 20-40 parts; The flame retardant is formed by compounding an organic flame retardant and an inorganic flame retardant, and the weight ratio of the organic flame retardant to the inorganic flame retardant is (2-10):(8-40).

2. The organic-inorganic composite flame retardant coating material according to claim 1, wherein The organic flame retardant is triphenyl phosphate, the inorganic flame retardant is ammonium polyphosphate and aluminum hydroxide, and the weight ratio of the triphenyl phosphate, ammonium polyphosphate and aluminum hydroxide is (2-10): (2-15): (6-30).

3. The organic-inorganic compound flame retardant coating material according to claim 1, characterized in that, The resin matrix is ​​epoxy-modified organic silicon resin, with a solid content of 30% to 60% and an epoxy value of 0.06g / 100g.

4. The organic-inorganic composite flame retardant coating material according to claim 1, characterized in that, The dispersing aid is BYK-110.

5. The organic-inorganic composite flame retardant coating material according to claim 1, characterized in that, The silane coupling agent is KH550.

6. The organic-inorganic composite flame retardant coating material according to claim 1, wherein The curing agent is a polyamide epoxy curing agent with an amine value of 160 mgKOH / g and a solid content of 50% to 70%.

7. The organic-inorganic composite flame retardant coating material according to claim 1, characterized in that, The diluent is a mixture of xylene and butyl acetate, and the weight ratio of the xylene to butyl acetate is (0.5-3):

1.

8. A preparation method of the organic-inorganic compound flame retardant coating material according to any one of claims 1 to 7, characterized in that, The following steps are involved: Step 1, preparing a flame retardant coating pre-dispersion: adding a resin matrix, a flame retardant, a dispersing aid and a silane coupling agent into a planetary ball mill for mixing according to a set weight ratio to obtain a flame retardant coating pre-dispersion; Step 2, preparing a flame retardant coating material: adding the flame retardant coating pre-dispersion into a stirring tank, and adding a curing agent and a diluent according to a set weight portion, and stirring the materials sufficiently to mix them evenly, thereby obtaining an organic-inorganic composite flame retardant coating material.

9. The preparation method according to claim 1, characterized in that, In step 1, the rotation speed of the planetary ball mill is set to 160 r / min to 240 r / min, and the ball milling time is 2 h to 6 h; In step 2, the rotation speed of the stirring tank is set to 1000 r / min to 1200 r / min, and the dispersion time is 0.5 h to 1 h.

10. Application of a flame retardant coating material, characterized in that, The flame retardant coating material is the organic-inorganic composite flame retardant coating material described in any one of claims 1 to 7, or the organic-inorganic composite flame retardant coating material prepared by the preparation method described in any one of claims 8 to 9, which is applied to industrial equipment, building materials or electronic devices to form a fireproof protective layer after curing.

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