A fire-resistant bus duct and a preparation method thereof

Abstract

The present invention relates to a fire-resistant bus duct and a preparation method thereof, wherein the bus duct is obtained by pouring a casting resin on a bus, and the casting resin is calculated by weight and includes: 100 parts of phenolic resin, 22-36 parts of modified zirconium diboride, 2-4 parts of lubricant, 0.5-1 parts of defoamer and 15-25 parts of curing agent. The present invention prepares a casting resin for a bus duct, which adopts a phenolic resin with excellent high temperature resistance as the main material, a filler is modified zirconium diboride, and a lubricant, a defoamer and a curing agent are also added. The prepared casting resin not only has better fire resistance than traditional phenolic resin, but also has better strength and toughness, and also has improved heat deformation resistance.

Description

Technical Field

[0001] The invention relates to the field of bus ducts, and in particular to a fire-resistant bus duct and a preparation method thereof. Background Art

[0002] With the rapid development of cities, the electricity load of buildings has increased dramatically. The original wires and cables have been gradually replaced by bus ducts with large capacity and convenient branching and bundling management due to the inconvenience of branching and bundling management. Bus duct is a closed metal device composed of copper and aluminum busbars, which is used to distribute high power to various components of the distributed system. Composite multifunctional bus ducts are widely used in power transmission trunks for fire fighting equipment and fire emergency equipment trunks.

[0003] With the emergence of modern engineering facilities and equipment, the electricity consumption of all walks of life has increased rapidly, especially with the emergence of numerous high-rise buildings and large workshops. Traditional cables as transmission conductors can no longer meet the requirements in high-current transmission systems. The parallel use of multiple cables has brought many inconveniences to on-site installation and construction. Plug-in bus ducts have emerged as a new type of distribution conductor. Compared with traditional cables, they fully demonstrate their superiority in high-current transmission. At the same time, due to the use of new technologies and new processes, the contact resistance and temperature rise of the connection points at both ends of the bus duct and the plug-in points of the branch ports are greatly reduced. High-quality insulating materials are used in the bus duct, thereby improving the safety and reliability of the bus duct and making the entire system more perfect.

[0004] Currently, most of the cast bus ducts on the market are cast with high-performance insulating resin and inorganic minerals. The busbars are directly cast and sealed. They have certain strength, fire resistance, explosion-proof and other functions. However, with the increasing requirements for bus ducts, the strength and fire resistance of the bus ducts currently on the market can no longer meet the demand. Summary of the invention

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a fire-resistant bus duct and a preparation method thereof.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] In a first aspect, the present invention provides a fire-resistant bus duct, wherein the bus duct is obtained by pouring a casting resin on a bus bar, and the casting resin is calculated by weight and includes:

[0008] 100 parts of phenolic resin, 22-36 parts of modified zirconium diboride, 2-4 parts of lubricant, 0.5-1 parts of defoamer and 15-25 parts of curing agent.

[0009] Preferably, the phenolic resin is a linear phenolic resin, and the brand is one of PF-8210, PF-8211, and PF-8020; more preferably, it is PF-8210.

[0010] Preferably, the lubricant is a mixture of one or more of stearic acid, zinc stearate and magnesium stearate.

[0011] Preferably, the defoamer is an organosilicon defoamer, including any one or more of BYK-024, BYK-093, BYK-A530, and BYK-141.

[0012] Preferably, the curing agent is hexamethylenetetramine.

[0013] Preferably, the preparation method of the modified zirconium diboride comprises:

[0014] S1. Weigh zirconium diboride ceramic powder and anhydrous ethanol, mix and disperse evenly, then add vinyl silane coupling agent, reflux and stir under the protection of nitrogen, after the treatment, filter and collect solid particles, wash three times with water, and vacuum dry to obtain vinyl zirconium diboride;

[0015] S2, weighing 4-vinylguaiacol and vinyl zirconium diboride, mixing them in toluene, heating to 60-80° C. under the protection of nitrogen, adding an azo initiator, stirring for 4-6 hours after the reaction is completed, removing the solvent under reduced pressure, collecting solid particles, washing them three times with ethanol, and vacuum drying to obtain guaiacol zirconium diboride;

[0016] S3, mixing guaiacol zirconium diboride and epichlorohydrin, ultrasonically dispersing them uniformly, adding a catalyst, stirring them uniformly, adding alkali solution dropwise, heating to 50-60° C., keeping the temperature and stirring for 2-4 hours, filtering out the solid after the reaction is completed, washing with water until neutral, then washing with alcohol three times, and drying under vacuum to obtain guaiacol glycidyl etherified zirconium diboride;

[0017] S4, weigh 2-aminopyrimidine and N,N-dimethylacetamide, mix them, stir them well, add guaiacol glycidyl etherified zirconium diboride, heat to 60-70°C under nitrogen protection, stir for 5-10h, after the reaction is completed, filter out the solid, wash it three times with water, and vacuum dry it to obtain modified zirconium diboride;

[0018] Preferably, in S1, the particle size of zirconium diboride ceramic powder is 600-800 mesh, and the vinyl silane coupling agent is A-151 or A-172.

[0019] Preferably, in S1, the mass volume ratio of zirconium diboride ceramic powder, vinyl silane coupling agent and anhydrous ethanol is 1 g: (0.12-0.24) g: (10-20) mL.

[0020] Preferably, in S1, the treatment temperature is 60-70°C and the treatment time is 10-15h.

[0021] Preferably, in S2, the mass volume ratio of vinyl zirconium diboride, 4-vinylguaiacol and toluene is 1 g: (0.3-0.6) g: (10-20) mL.

[0022] Preferably, in S2, the azo initiator is any one of azobisisobutyronitrile, azobisisovaleronitrile, azobiscyclohexylcarbonitrile and dimethyl azobisisobutyrate.

[0023] Preferably, in S2, the amount of the azo initiator added is 3%-8% of the mass of 4-vinylguaiacol.

[0024] Preferably, in S3, the mass volume ratio of guaiacolized zirconium diboride and epichlorohydrin is 1 g:(12-18) mL.

[0025] Preferably, in S3, the catalyst is tetrabutylammonium bromide or tetrabutylammonium hydrogen sulfate, and the added amount is 2%-6% of the mass of the guaiacolized zirconium diboride.

[0026] Preferably, in S3, the alkali solution is a sodium hydroxide aqueous solution with a mass fraction of 20%-30%, and the volume ratio of the alkali solution to epichlorohydrin is 0.3-0.6:1.

[0027] Preferably, in S4, the mass volume ratio of guaiacol glycidyl etherified zirconium diboride, 2-aminopyrimidine and N,N-dimethylacetamide is 1 g: (0.3-0.6) g: (12-20) mL.

[0028] In a second aspect, the present invention provides a method for preparing a refractory bus duct, comprising the following steps:

[0029] The first step is to weigh phenolic resin, modified zirconium diboride, defoamer, and lubricant according to weight parts, mix them evenly, add curing agent, mix them evenly again, and obtain casting resin;

[0030] The second step is to place the busbar in the mold, then pour in the casting resin, vibrate and degas, pressurize the mold to 10-20MPa, heat to 120-200℃ for 2-4h, and then naturally cool and demould to obtain a refractory busbar duct.

[0031] The beneficial effects of the present invention are:

[0032] 1. The present invention prepares a casting resin for a bus duct, which adopts a phenolic resin with excellent high temperature resistance as the main material, and a filler is modified zirconium diboride. In addition, a lubricant, a defoaming agent and a curing agent are added. The prepared casting resin not only has better fire resistance than traditional phenolic resin, but also has better strength and toughness, and its heat deformation resistance is also improved.

[0033] 2. Compared with the traditional casting resin, the main difference of the present invention is that the filler used is modified zirconium diboride. The filler is based on the zirconium diboride ceramic material, firstly subjected to vinyl treatment with a coupling agent to obtain vinyl zirconium diboride, then subjected to solution polymerization reaction with 4-vinylguaiacol to obtain guaiacolized zirconium diboride, then subjected to substitution treatment with epichlorohydrin to obtain guaiacol glycidyl etherified zirconium diboride, and finally subjected to a combination reaction with aminopyrimidine to obtain modified zirconium diboride.

[0034] 3. The modified zirconium diboride prepared by the present invention is used as a filler for casting resin, which not only has good compatibility with phenolic resin, but also has greatly enhanced and improved strength, toughness, heat deformation resistance and fire resistance of phenolic resin, so that the prepared casting resin can adapt to more severe environments and be used as a casting material for bus duct. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is described below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude the existence of other method steps before and after the combination step or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to limit the scope of the present invention. The change or adjustment of the relative relationship thereof shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0036] In order to better understand the above technical scheme, the exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0037] The present invention will be further described below in conjunction with the following examples.

[0038] Example 1

[0039] A fire-resistant bus duct, wherein the bus duct is obtained by pouring a casting resin on a bus bar, and the casting resin is calculated by weight and includes:

[0040] 100 parts of phenolic resin, 29 parts of modified zirconium diboride, 3 parts of lubricant, 0.6 parts of defoamer and 20 parts of curing agent.

[0041] The phenolic resin is a linear phenolic resin with a brand name of PF-8210; the lubricant is stearic acid; the defoamer is an organosilicon defoamer BYK-024; and the curing agent is hexamethylenetetramine (urotropine).

[0042] Wherein, the preparation method of the modified zirconium diboride comprises:

[0043] S1. Weigh 600-800 mesh zirconium diboride ceramic powder and anhydrous ethanol, mix and disperse evenly, then add vinyl silane coupling agent A-151, the mass volume ratio of zirconium diboride ceramic powder, vinyl silane coupling agent and anhydrous ethanol is 1g:0.18g:15mL, reflux and stir at 65°C for 12h under the protection of nitrogen, after the treatment, filter and collect solid particles, wash three times with water, and vacuum dry to obtain vinyl zirconium diboride;

[0044] S2, weigh 4-vinylguaiacol and vinyl zirconium diboride and mix them in toluene, the mass volume ratio of vinyl zirconium diboride, 4-vinylguaiacol and toluene is 1g:0.4g:15mL, heat to 70°C under the protection of nitrogen, add azobisisobutyronitrile, the addition amount is 5% of the mass of 4-vinylguaiacol, keep warm and stir for 5h, the reaction is completed, the solvent is removed under reduced pressure, the solid particles are collected, washed with ethanol three times, and vacuum dried to obtain guaiacol zirconium diboride;

[0045] S3, mixing guaiacol zirconium diboride and epichlorohydrin, the mass volume ratio of guaiacol zirconium diboride and epichlorohydrin is 1g:15mL, ultrasonically dispersed evenly, and then adding catalyst tetrabutylammonium bromide, the addition amount is 4% of the mass of guaiacol zirconium diboride, stirring evenly, adding 25% sodium hydroxide aqueous solution, the volume ratio of sodium hydroxide aqueous solution to epichlorohydrin is 0.4:1, heating to 55°C, stirring at this temperature for 3h, filtering out the solid after the reaction is completed, washing with water until neutral, then washing with alcohol three times, and drying under vacuum to obtain guaiacol glycidyl etherified zirconium diboride;

[0046] S4, weigh 2-aminopyrimidine and N, N-dimethylacetamide, mix them, stir them thoroughly, add guaiacol glycidyl etherified zirconium diboride, the mass volume ratio of guaiacol glycidyl etherified zirconium diboride, 2-aminopyrimidine and N, N-dimethylacetamide is 1g:0.4g:18mL, heat to 65°C under nitrogen protection, stir for 8h, after the reaction is completed, filter out the solid, wash it three times with water, and vacuum dry it to obtain modified zirconium diboride;

[0047] The method for preparing the above-mentioned fire-resistant bus duct comprises the following steps:

[0048] The first step is to weigh phenolic resin, modified zirconium diboride, defoamer, and lubricant according to weight parts, mix them evenly, add curing agent, mix them evenly again, and obtain casting resin;

[0049] The second step is to place the busbar in the mold, then pour in the casting resin, vibrate and degas, pressurize the mold to 15MPa, heat it to 160℃ for 3h, and then naturally cool it and demould it to obtain a refractory busbar duct.

[0050] Example 2

[0051] A fire-resistant bus duct, wherein the bus duct is obtained by pouring a casting resin on a bus bar, and the casting resin is calculated by weight and includes:

[0052] 100 parts of phenolic resin, 22 parts of modified zirconium diboride, 2 parts of lubricant, 0.5 parts of defoamer and 15 parts of curing agent.

[0053] The phenolic resin is a linear phenolic resin with a brand name of PF-8211; the lubricant is zinc stearate; the defoamer is an organosilicon defoamer BYK-141; and the curing agent is hexamethylenetetramine.

[0054] Wherein, the preparation method of the modified zirconium diboride comprises:

[0055] S1. Weigh 600-800 mesh zirconium diboride ceramic powder and anhydrous ethanol, mix and disperse evenly, then add vinyl silane coupling agent A-172, the mass volume ratio of zirconium diboride ceramic powder, vinyl silane coupling agent and anhydrous ethanol is 1g:0.12g:10mL, reflux and stir at 60°C for 10h under the protection of nitrogen, after the treatment, filter and collect solid particles, wash three times with water, and vacuum dry to obtain vinyl zirconium diboride;

[0056] S2, weigh 4-vinylguaiacol and vinyl zirconium diboride and mix them in toluene, the mass volume ratio of vinyl zirconium diboride, 4-vinylguaiacol and toluene is 1g:0.3g:10mL, heat to 60°C under the protection of nitrogen, add azobisisovaleronitrile, the addition amount is 3% of the mass of 4-vinylguaiacol, keep warm and stir for 4h, the reaction is completed, the solvent is removed under reduced pressure, the solid particles are collected, washed with ethanol three times, and vacuum dried to obtain guaiacol zirconium diboride;

[0057] S3, mixing guaiacol zirconium diboride and epichlorohydrin, the mass volume ratio of guaiacol zirconium diboride and epichlorohydrin is 1g:12mL, ultrasonically dispersed evenly, and then adding catalyst tetrabutylammonium bromide or tetrabutylammonium hydrogen sulfate, the added amount is 2% of the mass of guaiacol zirconium diboride, stirring evenly, adding 20% ​​sodium hydroxide aqueous solution, the volume ratio of sodium hydroxide aqueous solution to epichlorohydrin is 0.3:1, heating to 50°C, keeping warm and stirring for 2h, after the reaction is completed, filter out the solid, wash with water until neutral, then wash with alcohol three times, and dry under vacuum to obtain guaiacol glycidyl etherified zirconium diboride;

[0058] S4, weigh 2-aminopyrimidine and N, N-dimethylacetamide, mix them, stir them thoroughly, add guaiacol glycidyl etherified zirconium diboride, the mass volume ratio of guaiacol glycidyl etherified zirconium diboride, 2-aminopyrimidine and N, N-dimethylacetamide is 1g:0.3g:12mL, heat to 60°C under nitrogen protection, stir for 5h, after the reaction is completed, filter out the solid, wash it three times with water, and vacuum dry it to obtain modified zirconium diboride;

[0059] The method for preparing the above-mentioned fire-resistant bus duct comprises the following steps:

[0060] The first step is to weigh phenolic resin, modified zirconium diboride, defoamer, and lubricant according to weight parts, mix them evenly, add curing agent, mix them evenly again, and obtain casting resin;

[0061] The second step is to place the busbar in the mold, then pour in the casting resin, vibrate and degas, pressurize the mold to 10MPa, heat it to 140℃ for 4h, and then naturally cool it and demould it to obtain a refractory busbar duct.

[0062] Example 3

[0063] A fire-resistant bus duct, wherein the bus duct is obtained by pouring a casting resin on a bus bar, and the casting resin is calculated by weight and includes:

[0064] 100 parts of phenolic resin, 36 parts of modified zirconium diboride, 4 parts of lubricant, 1 part of defoamer and 25 parts of curing agent.

[0065] Wherein, the phenolic resin is a linear phenolic resin with a brand name of PF-8020; the lubricant is magnesium stearate; the defoamer is an organosilicon defoamer BYK-093; and the curing agent is hexamethylenetetramine.

[0066] Wherein, the preparation method of the modified zirconium diboride comprises:

[0067] S1. Weigh 600-800 mesh zirconium diboride ceramic powder and anhydrous ethanol, mix and disperse evenly, then add vinyl silane coupling agent A-151, the mass volume ratio of zirconium diboride ceramic powder, vinyl silane coupling agent and anhydrous ethanol is 1g:0.24g:20mL, reflux and stir at 70°C for 15h under the protection of nitrogen. After the treatment, filter and collect solid particles, wash three times with water, and vacuum dry to obtain vinyl zirconium diboride;

[0068] S2, weigh 4-vinylguaiacol and vinyl zirconium diboride and mix them in toluene, the mass volume ratio of vinyl zirconium diboride, 4-vinylguaiacol and toluene is 1g:0.6g:20mL, heat to 80°C under the protection of nitrogen, add azobisisobutyronitrile, the addition amount is 8% of the mass of 4-vinylguaiacol, keep warm and stir for 6h, the reaction is completed, the solvent is removed under reduced pressure, the solid particles are collected, washed with ethanol three times, and vacuum dried to obtain guaiacol zirconium diboride;

[0069] S3, mixing guaiacol zirconium diboride and epichlorohydrin, the mass volume ratio of guaiacol zirconium diboride and epichlorohydrin is 1g:18mL, ultrasonically dispersed evenly, and then adding catalyst tetrabutylammonium bromide or tetrabutylammonium hydrogen sulfate, the added amount is 6% of the mass of guaiacol zirconium diboride, stirring evenly, adding 30% sodium hydroxide aqueous solution, the volume ratio of sodium hydroxide aqueous solution to epichlorohydrin is 0.6:1, heating to 60°C, keeping warm and stirring for 4h, after the reaction is completed, filter out the solid, wash with water until neutral, then wash with alcohol three times, and dry under vacuum to obtain guaiacol glycidyl etherified zirconium diboride;

[0070] S4, weigh 2-aminopyrimidine and N, N-dimethylacetamide, mix them, stir them thoroughly, add guaiacol glycidyl etherified zirconium diboride, the mass volume ratio of guaiacol glycidyl etherified zirconium diboride, 2-aminopyrimidine and N, N-dimethylacetamide is 1g:0.6g:20mL, heat to 70°C under nitrogen protection, stir for 10h, after the reaction is completed, filter out the solid, wash it three times with water, and vacuum dry it to obtain modified zirconium diboride;

[0071] The method for preparing the above-mentioned fire-resistant bus duct comprises the following steps:

[0072] The first step is to weigh phenolic resin, modified zirconium diboride, defoamer, and lubricant according to weight parts, mix them evenly, add curing agent, mix them evenly again, and obtain casting resin;

[0073] The second step is to place the busbar in the mold, then pour in the casting resin, vibrate and degas, pressurize the mold to 20MPa, heat it to 180℃ for 2h, and then naturally cool it and demould it to obtain a refractory busbar duct.

[0074] Comparative Example 1

[0075] A refractory bus duct, the preparation method is the same as that of Example 1, the only difference is that the modified zirconium diboride in the casting resin is replaced by zirconium diboride ceramic powder, and the rest is the same as that of Example 1.

[0076] Casting resin is calculated by weight and includes:

[0077] 100 parts of phenolic resin, 36 parts of modified zirconium diboride, 4 parts of lubricant, 1 part of defoamer and 25 parts of curing agent.

[0078] Comparative Example 2

[0079] A fire-resistant bus duct, the preparation method is the same as that of Example 1, the only difference is that the modified zirconium diboride in the casting resin is replaced by ethylene zirconium diboride, and the rest is the same as that of Example 1.

[0080] Casting resin is calculated by weight and includes:

[0081] 100 parts of phenolic resin, 36 parts of vinyl zirconium diboride, 4 parts of lubricant, 1 part of defoamer and 25 parts of curing agent.

[0082] Comparative Example 3

[0083] A fire-resistant bus duct, the preparation method is the same as that of Example 1, the only difference is that the modified zirconium diboride in the casting resin is replaced by guaiacolized zirconium diboride, and the rest is the same as that of Example 1.

[0084] Casting resin is calculated by weight and includes:

[0085] 100 parts of phenolic resin, 36 parts of guaiacolized zirconium diboride, 4 parts of lubricant, 1 part of defoamer and 25 parts of curing agent.

[0086] The properties of the cured casting resins prepared in Example 1 and Comparative Examples 1-3 were tested. The tensile strength test was based on GB / T 2571-1995, the impact strength test was based on GB / T 2571-1995, the limiting oxygen index test was based on GB / T 2406-1993, and the heat deformation temperature test was based on GB / T 1634-2004. The test results are shown in Table 1:

[0087] Table 1 Performance test results of different casting resins

[0088] Tensile strength(MPa) <![CDATA[Impact strength (kJ / m 2 )]]> Limiting oxygen index Heat deformation temperature(℃) Example 1 62.4 7.5 34 252 Comparative Example 1 48.5 5.1 29 217 Comparative Example 2 52.9 5.6 29 220 Comparative Example 3 55.7 6.3 30 234

[0089] It can be seen from the test results in Table 1 that the casting resin of the fire-resistant bus duct prepared in Example 1 of the present invention has higher strength and toughness, and the higher oxygen index indicates stronger flame retardancy and fire resistance, and also has a higher heat deformation temperature, which enhances its application performance in the fire-resistant bus duct.

[0090] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0091] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A fire-resistant bus duct, characterized in that: The bus duct is obtained by pouring a casting resin on the busbar, and the casting resin is calculated by weight and includes: 100 parts of phenolic resin, 22-36 parts of modified zirconium diboride, 2-4 parts of lubricant, 0.5-1 parts of defoamer and 15-25 parts of curing agent; The preparation method of the modified zirconium diboride comprises: S1. Weigh zirconium diboride ceramic powder and anhydrous ethanol, mix and disperse evenly, then add vinyl silane coupling agent, reflux and stir under the protection of nitrogen, after the treatment, filter and collect solid particles, wash three times with water, and vacuum dry to obtain vinyl zirconium diboride; S2, weighing 4-vinylguaiacol and vinyl zirconium diboride, mixing them in toluene, heating to 60-80° C. under the protection of nitrogen, adding an azo initiator, stirring for 4-6 hours after the reaction is completed, removing the solvent under reduced pressure, collecting solid particles, washing them three times with ethanol, and vacuum drying to obtain guaiacol zirconium diboride; S3, mixing guaiacol zirconium diboride and epichlorohydrin, ultrasonically dispersing them uniformly, adding a catalyst, stirring them uniformly, adding alkali solution dropwise, heating to 50-60° C., keeping the temperature and stirring for 2-4 hours, filtering out the solid after the reaction is completed, washing with water until neutral, then washing with alcohol three times, and drying under vacuum to obtain guaiacol glycidyl etherified zirconium diboride; S4. Weigh 2-aminopyrimidine and N,N-dimethylacetamide, mix them, stir them thoroughly, add guaiacol glycidyl etherified zirconium diboride, heat to 60-70°C under nitrogen protection, stir for 5-10 hours, filter out the solid after the reaction is completed, wash with water three times, and vacuum dry to obtain modified zirconium diboride.

2. A fire-resistant bus duct according to claim 1, characterized in that: The phenolic resin is a linear phenolic resin, and the brand is one of PF-8210, PF-8211 and PF-8020.

3. The fire-resistant bus duct according to claim 1, characterized in that: The lubricant is a mixture of one or more of stearic acid, zinc stearate and magnesium stearate; and the curing agent is hexamethylenetetramine.

4. The fire-resistant bus duct according to claim 1, characterized in that: The defoamer is an organosilicon defoamer, including any one or more of BYK-024, BYK-093, BYK-A530 and BYK-141.

5. The fire-resistant bus duct according to claim 1, characterized in that: In the S1, the mass volume ratio of zirconium diboride ceramic powder, vinyl silane coupling agent and anhydrous ethanol is 1g: (0.12-0.24)g: (10-20)mL; the treatment temperature is 60-70°C, and the treatment time is 10-15h.

6. The fire-resistant bus duct according to claim 1, characterized in that: In S2, the mass volume ratio of vinyl zirconium diboride, 4-vinylguaiacol and toluene is 1 g: (0.3-0.6) g: (10-20) mL; and the amount of azo initiator added is 3%-8% of the mass of 4-vinylguaiacol.

7. The fire-resistant bus duct according to claim 1, characterized in that: In S3, the mass volume ratio of guaiacolized zirconium diboride and epichlorohydrin is 1 g: (12-18) mL; the catalyst is tetrabutylammonium bromide or tetrabutylammonium hydrogen sulfate, and the added amount is 2%-6% of the mass of guaiacolized zirconium diboride; the alkali solution is a sodium hydroxide aqueous solution with a mass fraction of 20%-30%, and the volume ratio of the alkali solution to epichlorohydrin is 0.3-0.6:

1.

8. The fire-resistant bus duct according to claim 1, characterized in that: In the S4, the mass volume ratio of guaiacol glycidyl etherified zirconium diboride, 2-aminopyrimidine and N,N-dimethylacetamide is 1 g: (0.3-0.6) g: (12-20) mL.

9. A method for preparing the fire-resistant bus duct according to claim 1, comprising the following steps: The first step is to weigh phenolic resin, modified zirconium diboride, defoamer, and lubricant according to weight parts, mix them evenly, add curing agent, mix them evenly again, and obtain casting resin; The second step is to place the busbar in the mold, then pour in the casting resin, vibrate and degas, pressurize and heat the mold, and then naturally cool it and demould it to obtain a refractory busbar duct.