Bromine-containing epoxy resin for insulating plate, preparation method of bromine-containing epoxy resin and preparation method of insulating plate

Abstract

The invention relates to the technical field of resin processing and preparation, and discloses bromine-containing epoxy resin for an insulating plate, a preparation method of the bromine-containing epoxy resin and a preparation method of the insulating plate. The molar ratio of the epoxy chloropropane to the tetrabromobisphenol A is controlled to be 1: (0.46-0.54), and the mass of the organic solvent is controlled to be 21%-30% of the mass of the tetrabromobisphenol A. Compared with the traditional molar ratio control range of the epoxy chloropropane and the tetrabromobisphenol A and the mass control percentage range of the traditional organic solvent, the method is more accurate; in the step S103, the mass fraction of alkali in the alkali liquor material is controlled to be 35-45%, the temperature of the cyclization reaction is controlled to be 95-110 DEG C, the time of the cyclization reaction is controlled to be 1.1-1.4 h, the latitude of each reaction is greatly restrained, the relative molecular mass of the bromine-containing epoxy resin is greatly guaranteed, the density of the bromine-containing epoxy resin is guaranteed, and the effect of improving the performance is achieved; the gummosis risk of the bromine-containing epoxy resin is reduced to a great extent, and the dimensional stability and the mechanical property of a finished product of a subsequent insulating plate are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of resin processing and preparation, and in particular to a bromine-containing epoxy resin for an insulating board and a preparation method thereof, and a preparation method of the insulating board. Background Art

[0002] Insulation boards made of bromine-containing epoxy resin are insulating materials with self-extinguishing function and good heat resistance. Bromine-containing epoxy resin is made of epoxy resin containing bromine element, also known as brominated epoxy resin or brominated epoxy resin. The bromine content of this type of resin is usually between 19% and 50%, and the softening point ranges from 51 to 100 degrees Celsius. Due to the unique flame retardant properties and electrical insulation of brominated epoxy resin, it is widely used in construction, aviation, shipbuilding, electronic and electrical industries.

[0003] An important feature of brominated epoxy resin is its self-extinguishing property, that is, it can extinguish itself when burning, which makes it very useful in situations where flame retardancy is required; in addition, it has good heat resistance and can maintain stable performance in high temperature environments; in the electronics industry, brominated epoxy resin is often used to make potting materials to protect electronic components from the influence of the external environment.

[0004] In the manufacturing process of bromine-containing epoxy resin insulation board, it is mainly necessary to prepare bromine-containing epoxy resin and insulation board. In the preparation process of bromine-containing epoxy resin and insulation board respectively, the existing prepared epoxy resin generally has a relatively low molecular weight, which may affect its performance; and because the lower molecular weight epoxy resin has the risk of gel flow, which will affect the dimensional stability and mechanical properties of the insulation board, it is difficult to stably improve the molecular weight of the epoxy resin, which will easily make it difficult to guarantee the performance of the final insulation board product. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a bromine-containing epoxy resin for an insulating board and a preparation method thereof and a preparation method of an insulating board, which solve the problems raised in the above background technology.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A method for preparing a bromine-containing epoxy resin for an insulating board comprises the following steps: S101: preparing raw materials and premixing materials, first preparing epichlorohydrin, tetrabromobisphenol A, organic solvent, quaternary ammonium salt aqueous solution, alkali solution and phosphoric acid, placing epichlorohydrin and tetrabromobisphenol A into the organic solvent for stirring and mixing, wherein the molar ratio of epichlorohydrin to tetrabromobisphenol A is controlled to be between 1:0.46 and 0.54, and the mass of the organic solvent is controlled to be 21% to 30% of the mass of tetrabromobisphenol A; S102: performing a catalytic reaction and an etherification reaction on the raw materials, placing the raw materials mixed in step S101 into a quaternary ammonium salt aqueous solution for a catalytic reaction, and heating the raw materials after the catalytic reaction to achieve an etherification reaction; S103: adding alkali liquid material and performing cyclization reaction treatment, adding alkali liquid material to the raw material after the etherification reaction in step S102 to perform cyclization reaction; the mass fraction of alkali in the alkali liquid material is 35% to 45%, the temperature of the cyclization reaction is controlled between 95 and 110° C., and the time of the cyclization reaction is 1.1 h to 1.4 h; S104: performing an excess alkali neutralization and removal treatment, adding phosphoric acid to the raw material after the cyclization reaction in step S103 to achieve an acid-base neutralization reaction, and adjusting the pH value of the organic phase to 7-8, thereby removing the excess alkali in the raw material; S105: washing, desalting and desolventizing the reaction material after the excess alkali is removed in step S104, and then washing, desalting and desolventizing the reaction material to obtain a finished bromine-containing epoxy resin raw material; S106: Performing a performance testing process, testing the molecular weight, glue flow performance, and flame retardant performance of the bromine-containing epoxy resin raw material prepared in step S105 to determine whether it meets the standards required for use of insulation boards; A method for preparing a bromine-containing epoxy resin insulating board comprises the following steps: S201: Mixing the bromine-containing epoxy resin with the basic preparation material, placing the finished bromine-containing epoxy resin in a stirring tank, and adding a dispersant, a defoaming agent, and an anti-aging filler respectively for stirring and mixing; S202: Reinforcing treatment of the mixed bromine-containing epoxy resin material, adding reinforcing fillers to the mixed bromine-containing epoxy resin material to which the dispersant, defoamer, and anti-aging filler were added and stirred and mixed in step S201, and adding silicon dioxide and calcium powder as fillers, and continuing stirring treatment to mix the mixed bromine-containing epoxy resin material; S203: mold filling and high temperature curing treatment, adding the mixed bromine-containing epoxy resin material with reinforcing filler added in step S202 into the insulation board mold, and performing high temperature heating, so that the mixed bromine-containing epoxy resin material is cured to form an insulation board matrix; S204: demoulding and post-processing of finished products, demoulding and cooling the insulating board substrate solidified in step S203, grinding the edge of the insulating board substrate that has been fully cooled and solidified, and measuring and cutting according to the size and shape specifications required.

[0007] Preferably, the specific steps of washing and desalting the reaction material in step S105 include: S301: First, a reaction termination treatment is performed, in which an appropriate amount of terminator is added in step S105 to stop the cyclization reaction and prevent excessive reaction; S302: Next, a deionized water washing treatment is performed, wherein the mixture after the reaction in step 301 is transferred to a water washing kettle, and a certain amount of deionized water is added for water washing and desalination treatment; S303: performing separation treatment of the aqueous phase and the organic phase again, separating the aqueous phase and the organic phase of the material washed with water in step S302 by centrifugation to obtain an organic phase containing bromine-containing epoxy resin; S304: then drying the organic phase, drying the organic phase separated in step S303, and continuing to remove the residual water in the organic phase; S305: Finally, the bromine-containing epoxy resin is filtered to remove impurities from the bromine-containing epoxy resin after drying in step S304, thereby obtaining a pure bromine-containing epoxy resin product.

[0008] Preferably, the specific steps of desolventizing the reaction material in step S105 include: S401: First, a secondary desalination treatment is performed by adding an appropriate amount of saturated salt solution to the organic phase after the reaction material is washed and desalted in step S105, and then performing a secondary water washing and liquid separation treatment; S402: then performing a secondary drying treatment, performing a secondary drying treatment on the organic phase after the secondary desalting treatment in step S401, adding anhydrous magnesium sulfate or anhydrous calcium chloride as a desiccant, and randomly filtering the organic phase after the secondary drying to remove the desiccant; S403: Finally, a solvent evaporation treatment is performed, in which the organic phase after the secondary drying treatment in step S402 is evaporated, and the evaporation treatment is performed under reduced pressure to further remove the solvent in the organic phase to obtain a pure bromine-containing epoxy resin.

[0009] Preferably, when the molecular weight of the prepared bromine-containing epoxy resin raw material is detected in step S106, the epoxy value and epoxy equivalent are determined by spectral analysis, and the spectral analysis adopts infrared spectroscopy, Raman spectroscopy or nuclear magnetic resonance spectroscopy to perform qualitative analysis and quantitative analysis of epoxy groups.

[0010] Preferably, the drying method for the organic phase in step S304 includes normal pressure drying or vacuum drying, and the use of normal pressure drying or vacuum drying depends on the moisture content requirement in the standard for preparing insulating boards for the product. If the moisture content control requirement is lower, the vacuum drying method is used, otherwise the normal pressure drying method is used.

[0011] Preferably, in the step S106, the gel flow performance of the prepared bromine-containing epoxy resin raw material is tested, and the gel flow performance is evaluated by measuring the fluidity and viscosity of the resin, and the test is performed by a rotational viscometer or a falling ball viscometer. The test data needs to refer to the test conditions consisting of specific temperature and shear rate.

[0012] Preferably, when the flame retardant properties of the prepared bromine-containing epoxy resin raw material are tested in step S106, vertical combustion test, horizontal combustion test, comprehensive thermal analysis, scanning electron microscope test, energy dispersive X-ray spectroscopy analysis and limiting oxygen index test are used for testing respectively.

[0013] Preferably, after the completion of step S202, if a highly flexible semi-shading insulating board is to be produced, steps S203 and S204 are not performed, but the glass fiber cloth is immersed in epoxy resin glue and then dried to form a prepreg, and multiple prepregs are randomly stacked, and the two exposed surfaces of the stacked two or more prepregs are covered with a release film, and then placed under vacuum conditions for hot pressing, and then cured to form a multi-layer highly flexible semi-shading insulating board.

[0014] Preferably, the organic solvent in step S101 includes toluene or methyl isobutyl ketone, the quaternary ammonium salt aqueous solution in step S102 serves as a catalyst and catalyzes the reaction, the alkali liquid material includes sodium hydroxide aqueous solution, and the phosphoric acid in step S101 has a mass concentration of 50%.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The bromine-containing epoxy resin for insulating board and its preparation method and the preparation method of insulating board, in step S101, the molar ratio of epichlorohydrin and tetrabromobisphenol A is controlled to be between 1:0.46 and 0.54, and the mass of the organic solvent is controlled to be 21% to 30% of the mass of tetrabromobisphenol A, which is more accurate than the conventional molar ratio control range of epichlorohydrin and tetrabromobisphenol A and the conventional mass control percentage range of the organic solvent, and in step S103, the mass fraction of the alkali in the alkali liquid is controlled to be 35% to 45%, the temperature of the cyclization reaction is controlled to be 95 to 110° C., and the cyclization reaction time is controlled to be 1.1h to 1.4h, which greatly constrains the tolerance of each reaction in the preparation, thereby greatly ensuring the relative molecular weight of the bromine-containing epoxy resin, ensuring the density of the bromine-containing epoxy resin, achieving the effect of improving performance, and greatly reducing the risk of gelling of the bromine-containing epoxy resin, thereby ensuring the dimensional stability and mechanical properties of the finished product of the subsequent insulating board.

[0016] In summary, the present application stably improves the molecular weight of the epoxy resin, thereby ensuring the stability of the dimensional stability and mechanical properties of the final insulation board product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a step diagram of the method for preparing the bromine-containing epoxy resin of the present invention; Figure 2 This is a step diagram of the method for preparing the insulating board of the present invention; Figure 3 This is a step diagram of the method for preparing the reaction material by washing and desalting according to the present invention; Figure 4 This is a step diagram of the desolventizing treatment method for the reaction materials of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1: Reference Figure 1-4 , a method for preparing a bromine-containing epoxy resin for an insulating board, comprising the following steps: S101: preparing raw materials and premixing materials, first preparing epichlorohydrin, tetrabromobisphenol A, organic solvent, quaternary ammonium salt aqueous solution, alkali solution and phosphoric acid, placing epichlorohydrin and tetrabromobisphenol A into the organic solvent for stirring and mixing, controlling the molar ratio of epichlorohydrin to tetrabromobisphenol A to be between 1:0.46 and 0.54, and controlling the mass of the organic solvent to be 21% to 30% of the mass of tetrabromobisphenol A; S102: performing a catalytic reaction and an etherification reaction on the raw materials, placing the raw materials mixed in step S101 into a quaternary ammonium salt aqueous solution for a catalytic reaction, and heating the raw materials after the catalytic reaction to achieve an etherification reaction; S103: adding alkali liquid material and performing cyclization reaction treatment, adding alkali liquid material to the raw material after the etherification reaction in step S102 to perform cyclization reaction; the mass fraction of alkali in the alkali liquid material is 35% to 45%, the temperature of the cyclization reaction is controlled between 95 and 110° C., and the time of the cyclization reaction is 1.1 h to 1.4 h; S104: performing an excess alkali neutralization and removal treatment, adding phosphoric acid to the raw material after the cyclization reaction in step S103 to achieve an acid-base neutralization reaction, and adjusting the pH value of the organic phase to 7-8, thereby removing the excess alkali in the raw material; S105: washing, desalting and desolventizing the reaction material after the excess alkali is removed in step S104, and then washing, desalting and desolventizing the reaction material to obtain a finished bromine-containing epoxy resin raw material; S106: Performing a performance testing process, testing the molecular weight, glue flow performance, and flame retardant performance of the bromine-containing epoxy resin raw material prepared in step S105 to determine whether it meets the standards required for use of insulation boards; A method for preparing a bromine-containing epoxy resin insulating board comprises the following steps: S201: Mixing the bromine-containing epoxy resin with the basic preparation material, placing the finished bromine-containing epoxy resin in a stirring tank, and adding a dispersant, a defoaming agent, and an anti-aging filler respectively for stirring and mixing; S202: Reinforcing treatment of the mixed bromine-containing epoxy resin material, adding reinforcing fillers to the mixed bromine-containing epoxy resin material to which the dispersant, defoamer, and anti-aging filler were added and stirred and mixed in step S201, and adding silicon dioxide and calcium powder as fillers, and continuing stirring treatment to mix the mixed bromine-containing epoxy resin material; S203: mold filling and high temperature curing treatment, adding the mixed bromine-containing epoxy resin material with reinforcing filler added in step S202 into the insulation board mold, and performing high temperature heating, so that the mixed bromine-containing epoxy resin material is cured to form an insulation board matrix; S204: demoulding and post-processing of finished products, demoulding and cooling the insulating board substrate solidified in step S203, grinding the edge of the insulating board substrate that has been fully cooled and solidified, and measuring and cutting according to the size and shape specifications required.

[0020] In the present invention, the specific steps of washing and desalting the reaction material in step S105 include: S301: First, a reaction termination treatment is performed, in which an appropriate amount of terminator is added in step S105 to stop the cyclization reaction and prevent excessive reaction; S302: Next, a deionized water washing treatment is performed, wherein the mixture after the reaction in step 301 is transferred to a water washing kettle, and a certain amount of deionized water is added for water washing and desalination treatment; S303: performing separation treatment of the aqueous phase and the organic phase again, separating the aqueous phase and the organic phase of the material washed with water in step S302 by centrifugation to obtain an organic phase containing bromine-containing epoxy resin; S304: then drying the organic phase, drying the organic phase separated in step S303, and continuing to remove the residual water in the organic phase; S305: Finally, the bromine-containing epoxy resin is filtered to remove impurities from the bromine-containing epoxy resin after drying in step S304, thereby obtaining a pure bromine-containing epoxy resin product.

[0021] More specifically, in step S301, a terminator is added to stop the cyclization reaction, which can avoid affecting the purity and performance of the product; in step S302, a certain amount of deionized water is added for washing, which can remove the salts and other water-soluble impurities generated during the reaction to a great extent; in S303, a centrifugal method is used to separate the aqueous phase and the organic phase, which can better separate the aqueous phase containing most of the inorganic salts and other water-soluble impurities.

[0022] In the present invention, the specific steps of desolventizing the reaction material in step S105 include: S401: First, a secondary desalination treatment is performed by adding an appropriate amount of saturated salt solution to the organic phase after the reaction material is washed and desalted in step S105, and then performing a secondary water washing and liquid separation treatment; S402: then performing a secondary drying treatment, performing a secondary drying treatment on the organic phase after the secondary desalting treatment in step S401, adding anhydrous magnesium sulfate or anhydrous calcium chloride as a desiccant, and randomly filtering the organic phase after the secondary drying to remove the desiccant; S403: Finally, a solvent evaporation treatment is performed, in which the organic phase after the secondary drying treatment in step S402 is evaporated, and the evaporation treatment is performed under reduced pressure to further remove the solvent in the organic phase to obtain a pure bromine-containing epoxy resin.

[0023] More specifically, since the organic phase after the reaction material is washed and desalted in step S105 may still contain some salt, the organic phase is further purified after a secondary desalination treatment in step S401; the evaporation treatment under reduced pressure conditions in step S403 can reduce the evaporation temperature and protect the organic phase of the bromine-containing epoxy resin from being destroyed by high temperature.

[0024] In the present invention, when the molecular weight of the prepared bromine-containing epoxy resin raw material is detected in step S106, the epoxy value and epoxy equivalent are respectively determined by spectral analysis, and the spectral analysis method uses infrared spectroscopy, Raman spectroscopy or nuclear magnetic resonance spectroscopy to perform qualitative analysis and quantitative analysis of epoxy groups.

[0025] More specifically, in step S501, the epoxy value and epoxy equivalent are determined by using a spectroscopic analysis method, thereby avoiding complicated steps in the chemical analysis method, such as using excess hydrochloric acid in a solvent to react with epoxy groups, quantitatively generating chlorohydrins, and quantitatively analyzing by alkaline titration.

[0026] In the present invention, the drying method for drying the organic phase in step S304 includes normal pressure drying or vacuum drying, and the use of normal pressure drying or vacuum drying depends on the water content requirement in the standard for preparing insulating boards for the product. If the water content control requirement is lower, the vacuum drying method is used, otherwise the normal pressure drying method is used.

[0027] More specifically, by determining the choice of atmospheric pressure drying or vacuum drying method based on the moisture content requirement in the product preparation insulation board standard, the atmospheric pressure drying method can be adopted when the moisture content requirement does not need to be too high, thereby saving more preparation costs compared to the vacuum drying method.

[0028] In the present invention, in step S106, the gel flow performance of the prepared bromine-containing epoxy resin raw material is tested, and the gel flow performance is evaluated by measuring the fluidity and viscosity of the resin. The test is performed by a rotational viscometer or a falling ball viscometer, and the test data needs to refer to the test conditions composed of specific temperature and shear rate.

[0029] More specifically, by referring to the test conditions consisting of specific temperature and shear rate, the flow performance of the resin can be more accurately evaluated, because under different temperature conditions, there is a gradual change in the flow performance, which ensures the accuracy of the detection.

[0030] In the present invention, when the flame retardant performance of the prepared bromine-containing epoxy resin raw material is tested in step S106, vertical combustion test, horizontal combustion test, comprehensive thermal analysis, scanning electron microscope test, energy dispersive X-ray spectroscopy analysis and limiting oxygen index test are used for testing respectively.

[0031] More specifically, by using multiple testing methods such as vertical combustion test, horizontal combustion test, comprehensive thermal analysis, scanning electron microscope test, energy dispersive X-ray spectroscopy analysis and limiting oxygen index test, it is convenient to evaluate the following flame retardant properties of epoxy resin from different angles: burning speed, flame propagation distance, thermal stability and other data.

[0032] In the present invention, the organic solvent in step S101 includes toluene or methyl isobutyl ketone, the quaternary ammonium salt aqueous solution in step S102 serves as a catalyst and catalyzes the reaction, the alkali liquid material includes a sodium hydroxide aqueous solution, and the phosphoric acid in step S101 has a mass concentration of 50%.

[0033] More specifically, by using toluene or methyl isobutyl ketone as a solvent, they can be selected according to the performance requirements of the insulation board. The high boiling point of toluene helps to control the volatilization rate during the curing process and avoid coating defects caused by too fast volatilization of the solvent. In addition, it has strong polarity and is well compatible with epoxy resin without migration, which helps to improve the gloss of the coating. Methyl isobutyl ketone as a solvent has good solubility and can effectively reduce the viscosity of the resin solution, which is convenient for construction and coating. It also has a suitable boiling point, which helps to control the volatilization rate of the solvent and ensure the fluidity of the resin during the construction process. Therefore, toluene or methyl isobutyl ketone can be selected as the solvent for the bromine-containing epoxy resin, which is convenient for adjustment according to the specific application requirements of the insulation board.

[0034] Embodiment 2: Compared with Embodiment 1, the difference of this embodiment is: Reference Figure 1-4 After step S202 is completed, if a highly flexible semi-shading insulating board needs to be manufactured, steps S203 and S204 are not performed, and the glass fiber cloth is impregnated in epoxy resin glue and then dried to form a prepreg. Multiple prepregs are randomly stacked, and release films are covered on the two exposed surfaces of the stacked two or more prepregs as a whole. Then, the prepregs are placed under vacuum conditions for hot pressing, and then cured to form a multi-layer highly flexible semi-shading insulating board.

[0035] More specifically, by abandoning the operations of steps S203 and S204 and semi-curing the glue on the glass fiber cloth, a PP sheet can be formed after semi-curing, and then vacuum hot pressing is performed to obtain a highly flexible semi-shielding insulating board, which is conducive to the processing of insulating boards with different application requirements.

[0036] Working principle: first, epichlorohydrin, tetrabromobisphenol A, organic solvent, quaternary ammonium salt aqueous solution, alkali liquid and phosphoric acid are prepared, epichlorohydrin and tetrabromobisphenol A are placed in the organic solvent for stirring and mixing, the molar ratio of epichlorohydrin and tetrabromobisphenol A is controlled between 1:0.46 and 0.54, and the mass of the organic solvent is controlled to be 21% to 30% of the mass of tetrabromobisphenol A, which is more accurate than the conventional molar ratio control range of epichlorohydrin and tetrabromobisphenol A and the mass control percentage range of the conventional organic solvent; then the mixed raw materials are placed in the quaternary ammonium salt aqueous solution for catalytic reaction, and the raw materials after the catalytic reaction are heated , to achieve etherification reaction treatment; then add alkali liquid material to carry out cyclization reaction; the mass fraction of alkali in the alkali liquid material is 35% to 45%, the temperature of the cyclization reaction is controlled between 95 and 110°C, and the time of the cyclization reaction is 1.1h to 1.4h, and the tolerance of each reaction is prepared by constraint force; phosphoric acid is added to the raw material after the cyclization reaction treatment to achieve acid-base neutralization reaction, and the pH value of the organic phase is adjusted to 7-8, thereby removing excess alkali in the raw material; finally, the reaction material after the excess alkali is removed is washed with water for desalting and desolventizing to obtain a finished bromine-containing epoxy resin raw material, and bromine-containing epoxy resin material for insulating board can be prepared.

[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a bromine-containing epoxy resin for an insulating board, characterized in that: The following steps are involved: S101: preparing raw materials and premixing materials, first preparing epichlorohydrin, tetrabromobisphenol A, organic solvent, quaternary ammonium salt aqueous solution, alkali solution and phosphoric acid, placing epichlorohydrin and tetrabromobisphenol A into the organic solvent for stirring and mixing, wherein the molar ratio of epichlorohydrin to tetrabromobisphenol A is controlled to be between 1:0.46 and 0.54, and the mass of the organic solvent is controlled to be 21% to 30% of the mass of tetrabromobisphenol A; S102: performing a catalytic reaction and an etherification reaction on the raw materials, placing the raw materials mixed in step S101 into a quaternary ammonium salt aqueous solution for a catalytic reaction, and heating the raw materials after the catalytic reaction to achieve an etherification reaction; S103: adding alkali liquid material and performing cyclization reaction treatment, adding alkali liquid material to the raw material after the etherification reaction in step S102 to perform cyclization reaction; the mass fraction of alkali in the alkali liquid material is 35% to 45%, the temperature of the cyclization reaction is controlled between 95 and 110° C., and the time of the cyclization reaction is 1.1 h to 1.4 h; S104: performing an excess alkali neutralization and removal treatment, adding phosphoric acid to the raw material after the cyclization reaction in step S103 to achieve an acid-base neutralization reaction, and adjusting the pH value of the organic phase to 7-8, thereby removing the excess alkali in the raw material; S105: washing, desalting and desolventizing the reaction material after the excess alkali is removed in step S104, and then washing, desalting and desolventizing the reaction material to obtain a finished bromine-containing epoxy resin raw material; S106: Performing performance testing, the bromine-containing epoxy resin raw material prepared in step S105 is tested for molecular weight, glue flow performance, and flame retardancy to determine whether it meets the standards required for use of insulation boards.

2. A method for preparing a bromine-containing epoxy resin insulating board, characterized in that: The following steps are involved: S201: Mixing the bromine-containing epoxy resin with the basic preparation material, placing the finished bromine-containing epoxy resin in a stirring tank, and adding a dispersant, a defoaming agent, and an anti-aging filler respectively for stirring and mixing; S202: Reinforcing treatment of the mixed bromine-containing epoxy resin material, adding reinforcing fillers to the mixed bromine-containing epoxy resin material to which the dispersant, defoamer, and anti-aging filler were added and stirred and mixed in step S201, and adding silicon dioxide and calcium powder as fillers, and continuing stirring treatment to mix the mixed bromine-containing epoxy resin material; S203: mold filling and high temperature curing treatment, adding the mixed bromine-containing epoxy resin material with reinforcing filler added in step S202 into the insulation board mold, and performing high temperature heating, so that the mixed bromine-containing epoxy resin material is cured to form an insulation board matrix; S204: demoulding and post-processing of finished products, demoulding and cooling the insulating board substrate solidified in step S203, grinding the edge of the insulating board substrate that has been fully cooled and solidified, and measuring and cutting according to the size and shape specifications required.

3. The method for preparing a bromine-containing epoxy resin for an insulating board according to claim 1, characterized in that: The specific steps of washing and desalting the reaction material in step S105 include: S301: First, a reaction termination treatment is performed, in which an appropriate amount of terminator is added in step S105 to stop the cyclization reaction and prevent excessive reaction; S302: Next, a deionized water washing treatment is performed, wherein the mixture after the reaction in step 301 is transferred to a water washing kettle, and a certain amount of deionized water is added for water washing and desalination treatment; S303: performing separation treatment of the aqueous phase and the organic phase again, separating the aqueous phase and the organic phase of the material washed with water in step S302 by centrifugation to obtain an organic phase containing bromine-containing epoxy resin; S304: then drying the organic phase, drying the organic phase separated in step S303, and continuing to remove the residual water in the organic phase; S305: Finally, the bromine-containing epoxy resin is filtered to remove impurities from the bromine-containing epoxy resin after drying in step S304, thereby obtaining a pure bromine-containing epoxy resin product.

4. The method for preparing a bromine-containing epoxy resin for an insulating board according to claim 1, characterized in that: The specific steps of desolventizing the reaction material in step S105 include: S401: First, a secondary desalination treatment is performed by adding an appropriate amount of saturated salt solution to the organic phase after the reaction material is washed and desalted in step S105, and then performing a secondary water washing and liquid separation treatment; S402: then performing a secondary drying treatment, performing a secondary drying treatment on the organic phase after the secondary desalting treatment in step S401, adding anhydrous magnesium sulfate or anhydrous calcium chloride as a desiccant, and randomly filtering the organic phase after the secondary drying to remove the desiccant; S403: Finally, a solvent evaporation treatment is performed, in which the organic phase after the secondary drying treatment in step S402 is evaporated, and the evaporation treatment is performed under reduced pressure to further remove the solvent in the organic phase to obtain a pure bromine-containing epoxy resin.

5. The method for preparing a bromine-containing epoxy resin for an insulating board according to claim 1, characterized in that: When the molecular weight of the prepared bromine-containing epoxy resin raw material is detected in step S106, the epoxy value and epoxy equivalent are measured by spectral analysis, and the spectral analysis adopts infrared spectroscopy, Raman spectroscopy or nuclear magnetic resonance spectroscopy to perform qualitative analysis and quantitative analysis of epoxy groups.

6. The method for preparing a bromine-containing epoxy resin for an insulating board according to claim 3, characterized in that: The drying method for the organic phase in step S304 includes normal pressure drying or vacuum drying, and the use of normal pressure drying or vacuum drying depends on the water content requirement in the standard for preparing insulating boards for the product. If the water content control requirement is lower, the vacuum drying method is used, otherwise the normal pressure drying method is used.

7. The method for preparing a bromine-containing epoxy resin for an insulating board according to claim 1, characterized in that: In the step S106, the gel flow performance of the prepared bromine-containing epoxy resin raw material is tested, and the gel flow performance is evaluated by measuring the fluidity and viscosity of the resin. The test is performed by a rotational viscometer or a falling ball viscometer, and the test data needs to refer to the test conditions consisting of specific temperature and shear rate.

8. The method for preparing a bromine-containing epoxy resin for an insulating board according to claim 1, characterized in that: In the step S106, when the flame retardant performance of the prepared bromine-containing epoxy resin raw material is tested, vertical combustion test, horizontal combustion test, comprehensive thermal analysis, scanning electron microscope test, energy dispersive X-ray spectroscopy analysis and limiting oxygen index test are used for testing respectively.

9. The method for preparing a bromine-containing epoxy resin insulation board according to claim 2, characterized in that: After the completion of step S202, if a highly flexible semi-shading insulating board needs to be produced, steps S203 and S204 are not performed, and the glass fiber cloth is immersed in epoxy resin glue and then dried to form a prepreg. Multiple prepregs are randomly stacked, and the two exposed surfaces of the stacked two or more prepregs are covered with a release film, which are then placed under vacuum conditions for hot pressing. After curing, a multi-layer highly flexible semi-shading insulating board can be formed.

10. The method for preparing a bromine-containing epoxy resin for an insulating board according to claim 1, characterized in that: The organic solvent in step S101 includes toluene or methyl isobutyl ketone, the quaternary ammonium salt aqueous solution in step S102 serves as a catalyst and catalyzes the reaction, the alkali liquid includes a sodium hydroxide aqueous solution, and the phosphoric acid in step S101 has a mass concentration of 50%.

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