Dynamic crosslinking PVC ceramic flame retardant and preparation method thereof

Abstract

The invention discloses a dynamic cross-linked PVC ceramic flame retardant and a preparation method thereof. The dynamic cross-linked PVC ceramic flame retardant comprises the following components: 10-50 parts of nano ceramic micro powder, 10-20 parts of ceramic fiber, 1-10 parts of organic silicon resin, 5-35 parts of a cross-linking agent, 5-20 parts of low-melting-point glass powder, 20-30 parts of fumed silica, 1-5 parts of a cross-linking accelerant and 1-10 parts of a coupling agent. According to the invention, on the basis of materials such as dimercapto-p-phenylboronic acid ester, cyclopentadiene, furan and the like, electron-rich conjugated olefin and electron-deficient olefin are subjected to a Diels-Alder addition reaction through a mechanism that newly generated chemical bonds and old chemical bonds at the center of a cross-linked network break at the same time, so that a dynamic cross-linked network is constructed; the mechanical tensile property and the self-repairing property of the material can be improved; the nano ceramic micro powder, the ceramic fiber, the low-melting-point glass powder and the fumed silica are used as a ceramic forming main body of the flame retardant, and can be quickly sintered into ceramic when meeting open fire, so that a firm and stable ceramic layer is formed, flame heat is effectively prevented from being transferred into a base material, combustion energy release is reduced, and continuous combustion of the base material is inhibited.

Description

Technical Field

[0001] This invention relates to the field of chemical materials technology, and more specifically, to a dynamically cross-linked PVC ceramic flame retardant and its preparation method. Background Technology

[0002] Polyvinyl chloride (PVC) is one of the earliest industrialized resins. PVC materials are widely used in various industries due to their high plasticity, ease of transportation, good barrier properties, acid and alkali resistance, and transparency. By adding different proportions of plasticizers during the manufacturing process, PVC can be made into materials with different properties, such as flexible products like wires and cables, leather, and advertising films. Adding plasticizers to flexible PVC improves its flexibility, but the addition of fillers and plasticizers reduces its flame retardancy and mechanical properties, making it unable to meet relevant standards. Therefore, improving the mechanical and flame retardant properties of flexible PVC is of great significance for expanding its application range.

[0003] Ceramicized flame retardancy is a sub-field of PVC flame retardancy. Currently, most ceramicized flame retardants use a blend of silica powder, quartz sand, and alumina ceramic powder to achieve their flame-retardant effect. In practical applications, this type of ceramic powder is prone to moisture absorption and fails to form a solid ceramic layer to insulate heat when exposed to open flame. The combustion residue is loose and brittle, unable to effectively block external heat transfer to the substrate or prevent oxygen diffusion to the polymer, resulting in rapid flame spread and low flame-retardant efficiency. Furthermore, these ceramicized materials generally have high hardness, poor compatibility with PVC, and are prone to agglomeration, leading to surface blooming and failure to meet relevant mechanical property standards.

[0004] To address the issue of decreased mechanical properties of PVC after the addition of ceramic flame retardants, the current main approach is to improve the toughness of PVC products by adding various impact modifiers. However, the addition of traditional impact modifiers only improves the toughness of PVC products. Some impact modifier molecules penetrate into the PVC molecules, breaking the bonds between PVC molecules. Under external force, this can easily cause the PVC molecular chains to break or slide, leading to issues such as decreased tensile strength. Because the traditional formulation system of impact modifiers combined with flame retardants results in strong plasticizing ability of the material, excessive addition can lead to premature plasticizing of the compound. Furthermore, traditional impact modifiers themselves have poor thermal stability, and their toughening effect is significantly reduced at high temperatures, resulting in a decline in other chemical and physical properties of the material. These problems have not yet been completely solved.

[0005] In view of the above, this application is hereby submitted. Summary of the Invention

[0006] Existing technologies suffer from problems such as poor mechanical properties, low activity, poor ceramicization performance, poor dispersibility and easy agglomeration, and insufficient flame retardancy in PVC material applications. This invention provides a dynamic crosslinked PVC ceramicized flame retardant and its preparation method. On the one hand, utilizing the characteristics of dynamic crosslinking through bond exchange, based on materials such as dimercapto-p-phenylboronic acid ester, cyclopentadiene, and furan, the mechanism of simultaneous formation of new chemical bonds and breakage of old chemical bonds at the center of the crosslinking network allows electron-rich conjugated olefins and electron-deficient olefins to undergo Diels-Alder addition reactions, thereby constructing a dynamic crosslinking network. This improves the mechanical tensile properties and self-healing properties of the material, while significantly enhancing the ceramicization performance at high temperatures and its compatibility with the base material. On the other hand, using nano-ceramic powder, ceramic fiber, low-melting-point glass powder, and fumed silica as the ceramicization matrix of the flame retardant, it can quickly sinter into ceramic upon exposure to open flame, forming a strong and stable ceramic layer. This effectively isolates the transfer of flame heat to the interior of the substrate, reduces the release of combustion energy, inhibits the continued combustion of the substrate, and ensures good flame retardancy.

[0007] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a dynamically cross-linked PVC ceramic flame retardant, comprising the following mass fractions: 10-50 parts of nano-ceramic powder, 10-20 parts of ceramic fiber, 1-10 parts of organosilicon resin, 5-35 parts of crosslinking agent, 5-20 parts of low melting point glass powder, 20-30 parts of fumed silica, 1-5 parts of crosslinking accelerator, and 1-10 parts of coupling agent.

[0008] In one specific embodiment, the nano-ceramic powder is one or more of the following: nano-alumina, mica powder, nano-montmorillonite, calcined kaolin, expanded perlite, molybdenum oxide, type A molecular sieve, wollastonite, magnesium oxide, talc powder, quartz powder, diatomaceous earth, fumed silica, and pyrophyllite.

[0009] In one specific embodiment, the ceramic fiber is one or more of wollastonite, aluminous feldspar, calcium feldspar, and alpha-wollastonite.

[0010] In one specific embodiment, the organosilicon resin is one or more of methylphenyl silicone resin, MQ silicone resin, methyl silicone resin, and phenyl silicone resin.

[0011] In one specific embodiment, the crosslinking agent is one or more of the following: dithiolated terephthalate, cyclopentadiene, furan, acrylic copolymer, chlorinated polyethylene, carboxylated nitrile rubber, polyhexamethylenetrimethoxysilane, methyl acrylate-butadiene-styrene terpolymer, maleamide, and dicyclopentadiene dicarboxylic acid.

[0012] In one specific embodiment, the crosslinking promoter is one or more of triethanolamine, dibutyltin dilaurate, stannous octoate, and ferrocene.

[0013] In one specific embodiment, the coupling agent is one or more of aluminate, silane, titanate, phosphate, lithium ester, borate, zirconate, zirconium aluminate, and stannate.

[0014] The flame retardant of this invention, firstly, utilizes the characteristics of dynamic cross-linking through bond exchange. Based on materials such as dimercapto-p-phenylboronic acid ester, cyclopentadiene, and furan, it constructs a dynamic cross-linking network by simultaneously generating new chemical bonds and breaking old chemical bonds at the center of the cross-linking network. This allows electron-rich conjugated olefins and electron-deficient olefins to undergo Diels-Alder addition reactions, thereby improving the mechanical tensile properties and self-healing properties of the material. At the same time, it significantly enhances the ceramicization properties of the ceramicized material at high temperatures and its compatibility with the base material.

[0015] Secondly, the ceramic matrix, which uses nano-ceramic powder, ceramic fiber, low-melting-point glass powder, and fumed silica as flame retardants, can quickly sinter into ceramic when exposed to open flame, forming a strong and stable ceramic layer. This effectively isolates the heat from the flame from being transferred to the interior of the substrate, reduces the release of combustion energy, inhibits the continued combustion of the substrate, and ensures good flame retardancy.

[0016] Finally, when the dynamically cross-linked ceramicized PVC flame retardant is added to PVC and reacts with an open flame, dynamic cross-linking and high-temperature ceramicization occur simultaneously under high temperature conditions. The dynamic cross-linking system significantly improves the ceramicization properties of the ceramic material. At the same time, the ceramic material is embedded in the dynamic cross-linking network, further enhancing the tensile mechanical properties of the system and achieving a highly efficient synergistic effect. It is also halogen-free, non-toxic, and does not produce corrosive gases.

[0017] Secondly, the present invention provides a method for preparing a dynamically cross-linked PVC ceramic flame retardant, comprising the following steps: (1) The main material is obtained by high-speed stirring of nano-ceramic powder, ceramic fiber, crosslinking agent, organosilicon resin, low melting point glass powder and fumed silica. (2) Under high-speed stirring and mixing, the coupling agent is sprayed into the main material through a high-pressure atomizing spraying device. After spraying, the mixture is kept at a constant temperature and allowed to fuse for a certain period of time to obtain a dynamic cross-linked PVC ceramic flame retardant.

[0018] In the preparation of dynamically cross-linked ceramicized PVC flame retardants, this invention employs high-pressure atomized spraying of coupling agents such as aluminate, silane, titanate, phosphate, and lithium ester to achieve ultra-fine dispersion modification and activation of the main material, inhibiting powder agglomeration and further improving the dispersibility and compatibility of the flame retardant material in the PVC base material. Simultaneously, this invention utilizes a method that combines high-speed mixing with high-pressure atomized spraying of aluminate.

[0019] In one specific embodiment, the high-speed stirring speed is 50~1000 r / min, the high-speed stirring time is 5~50 min, the material mixing temperature is 30~100℃, and the high-pressure atomized spray liquid flow rate is 2~20L / min.

[0020] In one specific implementation, the constant temperature static fusion time is 10~100min.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. The present invention provides a dynamic crosslinked PVC ceramic flame retardant and its preparation method. Utilizing the characteristics of dynamic crosslinking through bond exchange, and based on materials such as dimercapto-p-phenylboronic acid ester, cyclopentadiene, and furan, the method achieves this by simultaneously generating new chemical bonds and breaking old chemical bonds at the center of the crosslinked network. This allows electron-rich conjugated olefins and electron-deficient olefins to undergo Diels-Alder addition reactions, thereby constructing a dynamic crosslinked network. This improves the mechanical tensile properties and self-healing properties of the material, while also significantly enhancing the ceramicization properties of the ceramicized material at high temperatures and its compatibility with the base material. 2. The present invention provides a dynamic cross-linked PVC ceramic flame retardant and its preparation method, which uses nano-ceramic powder, ceramic fiber, low melting point glass powder and fumed silica as the ceramic body of the flame retardant. When exposed to open flame, it can be quickly sintered into ceramic to form a strong and stable ceramic layer, effectively isolating the heat of the flame from the interior of the substrate, reducing the release of combustion energy, inhibiting the continuous combustion of the substrate, and ensuring good flame retardancy. 3. The present invention provides a dynamic crosslinked PVC ceramic flame retardant and its preparation method. When the dynamic crosslinked PVC flame retardant is added to PVC and reacts with an open flame, dynamic crosslinking and high-temperature ceramicization occur simultaneously under high temperature conditions. The dynamic crosslinking system significantly improves the ceramicization properties of the ceramic material. At the same time, the ceramic material is embedded in the dynamic crosslinking network, which further enhances the tensile mechanical properties of the system and achieves a highly efficient synergistic effect. It is also halogen-free, non-toxic, and does not produce corrosive gases. 4. This invention provides a dynamically cross-linked PVC ceramic flame retardant and its preparation method. It employs high-pressure atomized spraying of coupling agents such as aluminate, silane, titanate, phosphate, and lithium ester to achieve ultra-fine dispersion modification and activation of the main material, inhibiting powder agglomeration and further improving the dispersibility and compatibility of the flame retardant material in the PVC base material. Simultaneously, this invention uses a method that simultaneously performs high-speed mixing and high-pressure atomized spraying of aluminate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the embodiments. The illustrative embodiments and descriptions of this invention are only used to explain this invention and are not intended to limit this invention.

[0023] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that these specific details are not necessary to practice the invention. In other embodiments, well-known materials or methods have not been specifically described in order to avoid obscuring the invention.

[0024] Throughout this specification, references to “an embodiment,” “an example,” or “an example” mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases “an embodiment,” “an example,” “an example,” or “an example” appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0025] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60–120 and 80–110 are listed for a specific parameter, it is understood that ranges of 60–110 and 80–120 are also expected. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1–3, 1–4, 1–5, 2–3, 2–4, and 2–5. In this application, unless otherwise stated, the numerical range "a–b" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0~5" indicates that all real numbers between "0~5" have been listed in this article; "0~5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0026] Unless otherwise specified, all steps in this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the method may also include step (c), indicating that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0027] Example 1 This invention provides a method for preparing a dynamically cross-linked PVC ceramic flame retardant, the specific method of which is as follows: (1) Nano-ceramic powder, ceramic fiber, crosslinking agent, organosilicon resin, low melting point glass powder, and fumed silica are added to a high-speed mixer and mixed at high speed to obtain the main material; (2) Under high-speed stirring and mixing, the coupling agent is sprayed into the main material through a high-pressure atomizing spraying device. After spraying, the mixture is kept at a constant temperature and allowed to fuse for a certain period of time to obtain a dynamic cross-linked PVC ceramic flame retardant.

[0028] The high-speed mixer is set to 100 r / min, the high-speed mixing time is 30 min, the material mixing temperature is controlled at 50℃, and the liquid control flow rate of the high-pressure atomizing spray device is 3 L / min. The mass composition of each component in the dynamically cross-linked ceramicized PVC flame retardant is as follows: 20 parts nano alumina, 20 parts magnesium oxide, 10 parts montmorillonite, 8 parts cyclopentadiene, 8 parts phenyl silicone resin, 8 parts low melting point glass powder, 2 parts wollastonite, 1‰ dibutyltin dilaurate, 20 parts fumed silica, and 4 parts coupling agent aluminate.

[0029] Example 2 This invention provides a method for preparing a dynamically cross-linked PVC ceramic flame retardant, the specific method of which is as follows: (1) Nano-ceramic powder, ceramic fiber, crosslinking agent, organosilicon resin, low melting point glass powder, and fumed silica are added to a high-speed mixer and mixed at high speed to obtain the main material; (2) Under high-speed stirring and mixing, the coupling agent is sprayed into the main material through a high-pressure atomizing spraying device. After spraying, the mixture is kept at a constant temperature and allowed to fuse for a certain period of time to obtain a dynamic cross-linked PVC ceramic flame retardant.

[0030] The high-speed mixer is set to 100 r / min, the high-speed mixing time is 30 min, the material mixing temperature is controlled at 50℃, and the liquid control flow rate of the high-pressure atomizing spray device is 3 L / min. The mass composition of each component in the dynamically cross-linked ceramicized PVC flame retardant is as follows: 20 parts nano alumina, 20 parts magnesium oxide, 10 parts talc, 5 parts acrylic copolymer, 5 parts methyl phenyl silicone resin, 5 parts low melting point glass powder, 23 parts fumed silica, 2 parts wollastonite, 2 parts coupling agent aluminate, and 1‰ dibutyltin dilaurate.

[0031] Example 3 This invention provides a method for preparing a dynamically cross-linked PVC ceramic flame retardant, the specific method of which is as follows: (1) Nano-ceramic powder, ceramic fiber, crosslinking agent, organosilicon resin, low melting point glass powder, and fumed silica are added to a high-speed mixer and mixed at high speed to obtain the main material; (2) Under high-speed stirring and mixing, the coupling agent is sprayed into the main material through a high-pressure atomizing spraying device. After spraying, the mixture is kept at a constant temperature and allowed to fuse for a certain period of time to obtain a dynamic cross-linked PVC ceramic flame retardant.

[0032] The high-speed mixer is set to 100 r / min, the high-speed mixing time is 40 min, the material mixing temperature is controlled at 50℃, and the liquid control flow rate of the high-pressure atomizing spray device is 3 L / min. The mass composition of each component in the dynamically cross-linked ceramicized PVC flame retardant is as follows: 20 parts nano alumina, 20 parts magnesium oxide, 10 parts montmorillonite, 35 parts cyclopentadiene, 10 parts phenyl silicone resin, 20 parts low melting point glass powder, 28 parts fumed silica, 2 parts wollastonite, 10 parts coupling agent aluminate, and 1‰ dibutyltin dilaurate.

[0033] Comparative Example 1 This comparative example provides a method for preparing a ceramicized PVC flame retardant, the specific method of which is as follows: Ordinary ceramic powder is added to a high-speed mixer. Under high-speed mixing, the coupling agent is sprayed onto the main material through a high-pressure atomizing spray device. After spraying, the mixture is kept at a constant temperature and allowed to fuse for a certain period of time to obtain the flame retardant.

[0034] The high-speed mixer is set to 100 r / min, the high-speed mixing time is 30 min, the material mixing temperature is controlled at 50℃, and the liquid control flow rate of the high-pressure atomizing spray device is 3 L / min. The mass composition of each component in the ceramicized PVC flame retardant is as follows: Four parts of ordinary ceramic powder and coupling agent aluminate.

[0035] Comparative Example 2 This comparative example provides a method for preparing a ceramicized PVC flame retardant, the specific method of which is as follows: Nano-ceramic powder, ceramic fiber, organosilicon resin, low-melting-point glass powder, fumed silica, and calcium carbonate filler are stirred and added to a high-speed mixer for high-speed mixing to obtain the main material; The high-speed mixer is set to 100 r / min, the high-speed mixing time is 30 min, and the material mixing temperature is controlled at 50℃. The mass composition of each component in the ceramicized PVC flame retardant is as follows: 20 parts nano alumina, 20 parts magnesium oxide, 10 parts montmorillonite, 8 parts phenyl silicone resin, 10 parts low melting point glass powder, 20 parts fumed silica, 2 parts wollastonite, and 12 parts calcium carbonate filler.

[0036] Comparative Example 3 This comparative example provides a method for preparing a ceramicized PVC flame retardant, the specific method of which is as follows: (1) Add calcium carbonate filler and crosslinking agent to a high-speed mixer and mix them at high speed to obtain the main material; (2) Under high-speed stirring and mixing, the coupling agent is sprayed into the main material through a high-pressure atomizing spraying device. After spraying, the mixture is kept at a constant temperature and allowed to fuse for a certain period of time to obtain a dynamic cross-linked PVC ceramic flame retardant.

[0037] The high-speed mixer is set to 100 r / min, the high-speed mixing time is 30 min, the material mixing temperature is controlled at 50℃, and the liquid control flow rate of the high-pressure atomizing spray device is 3 L / min. The mass composition of each component in the ceramicized PVC flame retardant is as follows: 8 parts cyclopentadiene, 4 parts coupling agent silane, and 88 parts calcium carbonate filler.

[0038] Performance testing The dynamically cross-linked ceramicized PVC flame retardants prepared in Examples 1-3 and the ordinary ceramicized PVC flame retardants prepared in Comparative Examples 1-3 were tested, and the test results are shown in Table 1.

[0039] Table 1 .

[0040] The dynamically cross-linked ceramicized PVC flame retardants prepared in Examples 1-3 and the ordinary ceramicized PVC flame retardants prepared in Comparative Examples 1-3 were added to PVC materials in the same proportions to prepare PVC with flame retardant properties, and their properties were tested. The test results are shown in Table 2.

[0041] Table 2 .

[0042] As shown in Tables 1 and 2, compared with the comparative examples, the dynamically cross-linked ceramicized PVC flame retardant prepared according to this invention exhibits superior oxygen index, horizontal burning time, burning rate, tensile strength, yield strength, and maximum tensile strength compared to the ordinary ceramicized flame retardant in the comparative examples. Specifically, in Comparative Example 2, without adding a cross-linking agent to promote dynamic cross-linking of PVC, the tensile strength of the PVC material significantly decreased, and the oxygen index slightly decreased. In Comparative Example 3, without adding ceramicized flame retardant material, only adding a dynamic cross-linking promoter, the flame retardant performance of the material decreased sharply, and its mechanical properties were also affected. Therefore, the dynamic cross-linked ceramicized flame retardant of PVC achieves a systematic flame retardant and toughening effect through component synergy. Each component material needs to fully exert its synergistic effect to promote dynamic cross-linking of the material while forming a robust ceramic protective insulation layer, thereby improving the mechanical and flame retardant properties of the PVC material.

[0043] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A dynamically cross-linked PVC ceramic flame retardant, characterized in that, Includes the following mass fraction array: 10-50 parts of nano-ceramic powder, 10-20 parts of ceramic fiber, 1-10 parts of organosilicon resin, 5-35 parts of crosslinking agent, 5-20 parts of low melting point glass powder, 20-30 parts of fumed silica, 1-5 parts of crosslinking accelerator, and 1-10 parts of coupling agent.

2. The dynamically cross-linked PVC ceramic flame retardant according to claim 1, characterized in that, The nano-ceramic powder is made from one or more of the following: nano-alumina, mica powder, nano-montmorillonite, calcined kaolin, expanded perlite, molybdenum oxide, type A molecular sieve, magnesium oxide, talc powder, quartz powder, diatomaceous earth, fumed silica, and pyrophyllite.

3. The dynamically cross-linked PVC ceramic flame retardant according to claim 1, characterized in that, The ceramic fiber is made of one or more of wollastonite, aluminous feldspar, calcium feldspar, and alpha-wollastonite.

4. The dynamically cross-linked PVC ceramic flame retardant according to claim 1, characterized in that, The silicone resin is one or more of methylphenyl silicone resin, MQ silicone resin, methyl silicone resin, and phenyl silicone resin.

5. The dynamically cross-linked PVC ceramic flame retardant according to claim 1, characterized in that, The crosslinking agent is one or more of the following: dithiolated terephthalate, cyclopentadiene, furan, acrylic copolymer, chlorinated polyethylene, carboxylated nitrile rubber, polyhexamethylenetrimethoxysilane, methyl acrylate-butadiene-styrene terpolymer, maleamide, and dicyclopentadiene dicarboxylic acid.

6. The dynamically cross-linked PVC ceramic flame retardant according to claim 1, characterized in that, The crosslinking accelerator is one or more of triethanolamine, dibutyltin dilaurate, stannous octoate, and ferrocene.

7. The dynamically cross-linked PVC ceramic flame retardant according to claim 1, characterized in that, The coupling agent is one or more of the following: aluminate, silane, titanate, phosphate, lithium ester, borate, zirconate, zirconium aluminate, and stannate.

8. The method for preparing the dynamically cross-linked PVC ceramicized flame retardant according to any one of claims 1 to 7, characterized in that, Includes the following steps: (1) The main material is obtained by high-speed stirring of nano-ceramic powder, ceramic fiber, crosslinking agent, organosilicon resin, low melting point glass powder and fumed silica. (2) Under high-speed stirring and mixing, the coupling agent, crosslinking agent and crosslinking accelerator are sprayed onto the main material through a high-pressure atomizing spraying device. After spraying, the material is kept at a constant temperature and allowed to fuse for a certain period of time to obtain a dynamic crosslinked PVC ceramic flame retardant.

9. The method for preparing the dynamically cross-linked PVC ceramic flame retardant according to claim 8, characterized in that, The high-speed stirring speed is 50~1000 r / min, the high-speed stirring time is 5~50 min, the material mixing temperature is 30~100℃, and the high-pressure atomized spray liquid flow rate is 2~20L / min.

10. The method for preparing the dynamically cross-linked PVC ceramic flame retardant according to claim 8, characterized in that, The constant temperature incubation time is 10~100min.