CN113717371A - Preparation method of low-viscosity reactive flame-retardant polyether polyol, reactive flame-retardant heat-conducting polyurethane electronic pouring sealant and preparation method thereof - Google Patents

Preparation method of low-viscosity reactive flame-retardant polyether polyol, reactive flame-retardant heat-conducting polyurethane electronic pouring sealant and preparation method thereof Download PDF

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CN113717371A
CN113717371A CN202111002930.7A CN202111002930A CN113717371A CN 113717371 A CN113717371 A CN 113717371A CN 202111002930 A CN202111002930 A CN 202111002930A CN 113717371 A CN113717371 A CN 113717371A
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retardant
polyether polyol
reactive flame
heat
conducting
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CN113717371B (en
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李健
戈欢
孙兆任
李剑锋
栾森
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Shandong Inov New Material Co Ltd
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Shandong Inov New Material Co Ltd
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    • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
    • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
    • C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
    • C08G65/2639—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing elements other than oxygen, nitrogen or sulfur
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Abstract

The invention relates to a preparation method of low-viscosity reactive flame-retardant polyether polyol, a reactive flame-retardant heat-conducting polyurethane electronic pouring sealant and a preparation method thereof, and belongs to the technical field of polyurethane electronic pouring sealants. The invention takes low molecular weight polyether, bisphenol A polyether and aromatic alcohol/phenol containing halogen as composite initiator, and the low molecular weight polyether, the bisphenol A polyether and the aromatic alcohol/phenol containing halogen are polymerized with alkylene oxide under the action of bimetallic catalyst to obtain the low viscosity reaction type flame retardant polyether polyol. The component A comprises diisocyanate, isocyanate group cage type polysilsesquioxane, polyoxypropylene polyether polyol, polytetrahydrofuran polyether polyol and a plasticizer; the component B comprises a chain extender, reactive flame-retardant polyether polyol, defoaming agent polyether polyol, heat-conducting filler, polypropylene oxide polyether polyol, a catalyst and an antioxidant; the pouring sealant prepared by the invention has excellent flame retardant property and heat conduction property; the invention also provides a simple and feasible preparation method.

Description

Preparation method of low-viscosity reactive flame-retardant polyether polyol, reactive flame-retardant heat-conducting polyurethane electronic pouring sealant and preparation method thereof
Technical Field
The invention relates to a preparation method of low-viscosity reactive flame-retardant polyether polyol, a reactive flame-retardant heat-conducting polyurethane electronic pouring sealant and a preparation method thereof, and belongs to the technical field of polyurethane electronic pouring sealants.
Background
Polyurethane elastomers are widely used in various fields such as sports, medical treatment, automobiles, buildings and the like due to the wide performance controllability range and the excellent characteristics of ultraviolet resistance, wear resistance, solvent resistance and the like. Polyurethane elastomers can be classified into a casting type and a thermoplastic type according to the processing technique. As one of the casting polyurethane, the polyurethane pouring sealant can be cured and formed at room temperature through a simple pouring and sealing process, and the excellent insulativity of the polyurethane pouring sealant ensures the normal operation of a battery, an electronic element and a matched device thereof. However, chemical bonds in the polyurethane chain segments are mainly carbon-hydrogen bonds, the bonds are low in energy and easy to break, and the polyurethane material belongs to flammable materials according to the combustion grade; meanwhile, the polyurethane pouring sealant cannot effectively conduct heat generated in the working process of the electronic element, and the service performance of the polyurethane pouring sealant is reduced. Therefore, the preparation of the heat-conducting flame-retardant electronic pouring sealant becomes a hotspot of research.
The flame retardant is divided into an additive type flame retardant and a reactive type flame retardant, and the additive type flame retardant electronic pouring sealant is mainly used for improving the flame retardant property by adding a large fraction of phosphate or low molecular weight halogen. CN111732927A provides a high-hardness flame-retardant polyurethane electronic pouring sealant and a preparation method thereof, wherein phosphate (component A) and chlorinated paraffin-52 (component B) are used as flame retardants, and the flame retardant grade of the pouring sealant can reach V0. The phosphate and the chlorinated paraffin-52 are both additive type, and have mobility and the danger of corroding electronic devices; when the proportion of the phosphate ester is higher, the toughness of the material is reduced; CN111704886A discloses a two-component high-toughness flame-retardant polyurethane electronic pouring sealant and a preparation method thereof, wherein V-0-level flame retardance is achieved by adopting additive flame retardants such as tris (2-chloropropyl) phosphate, tris (2-carboxyethyl) phosphine, isopropylphenyl diphenyl phosphate, chlorinated paraffin-52, chlorinated paraffin-42 and the like; CN107216846A adopts a mixture of dibromo neopentyl glycol and resorcinol (bis diphenyl phosphate) to retard the flame of polyurethane electronic pouring sealant, and the dibromo neopentyl glycol is expensive and has a high melting point (114 ℃ C. and 116 ℃ C.), thereby being not suitable for industrial popularization.
The current commercial reaction type flame-retardant polyether is generally higher in price and has a plurality of restriction factors, such as higher viscosity (viscosity of tetrabromophthalic anhydride glycol is 80000-125000mPa & s); the color value is darker (generally amber or brown), and the appearance and the service performance of the polyurethane material are influenced. Therefore, the research and development of low-viscosity reactive flame-retardant polyether polyol for preparing flame-retardant heat-conducting type polyurethane electronic pouring sealant is an urgent problem to be solved.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and providing a preparation method of low-viscosity reaction type flame-retardant polyether polyol, which is simple and easy to operate, has no post-treatment process and moderate viscosity of the prepared polyether polyol; the reactive flame-retardant heat-conducting polyurethane electronic pouring sealant has excellent flame-retardant property and heat-conducting property; the invention also provides a simple and feasible preparation method.
The preparation method of the low-viscosity reaction type flame-retardant polyether polyol comprises the steps of taking 1 part of low-molecular-weight polyether, 1-2 parts of bisphenol A polyether and 1-3 parts of halogen-containing aromatic alcohol/phenol as composite initiators, carrying out polymerization reaction with alkylene oxide under the action of 30-1000ppm of bimetallic catalyst, and polymerizing for 3-6h at 130-140 ℃ to obtain the low-viscosity reaction type flame-retardant polyether polyol.
Preferably, the low molecular weight polyether has a functionality of 2 to 3 and 500. ltoreq. Mn.ltoreq.1000.
Preferably, the halogen-containing aromatic alcohol/phenol is one or more of 2, 3-dibromo-4, 5-dihydroxybenzyl alcohol, 2, 4-dichlorobenzyl alcohol, 5-chloro-2-hydroxybenzyl alcohol, 3- (3-bromophenyl) -2-propyn-1-ol, tetrabromobisphenol A, 5-bromo-2-hydroxybenzyl alcohol or tribromophenol.
The reactive flame-retardant heat-conducting polyurethane electronic pouring sealant prepared by utilizing the low-viscosity reactive flame-retardant polyether polyol comprises a component A and a component B, wherein,
the component A comprises: comprises diisocyanate, isocyanate group cage type polysilsesquioxane, polypropylene oxide polyether polyol, polytetrahydrofuran polyether polyol and a plasticizer;
and B component: comprises a chain extender, reactive flame-retardant polyether polyol, defoaming agent polyether polyol, heat-conducting filler, polypropylene oxide polyether polyol, a catalyst and an antioxidant;
the isocyanate group cage type polysilsesquioxane is prepared by reacting diisocyanate and tetrahydrofuran solution of hydroxyl-terminated cage type silsesquioxane, wherein the mass percentage of the hydroxyl-terminated cage type silsesquioxane is 30-50%, and the reaction temperature is 60-80 ℃; preferably, the weight percentage of the hydroxyl cage type silsesquioxane is 40 percent.
The functionality of the reactive flame-retardant polyether polyol is 2-3, the hydroxyl value is 56-165mg KOH/g, and the viscosity is 700-15500mpa & s.
Preferably, the component A comprises the following raw materials in percentage by mass:
Figure BDA0003236194360000021
preferably, the diisocyanate is one or more of diphenylmethane diisocyanate, HDI, IPDI or toluene diisocyanate. The amount used is more preferably 40%.
Preferably, the plasticizer is one or more of dioctyl phthalate, dioctyl sebacate, trioctyl trimellitate, epoxidized soybean oil, or dibutyl phthalate. Further preferably dioctyl phthalate.
Preferably, the polyoxypropylene ether polyol has a number average molecular weight of 1000-6000 and a functionality of 2 or 3.
Preferably, the polytetrahydrofuran ether polyol has a number average molecular weight of 1000-2000 and a functionality of 2.
Preferably, the component B comprises the following raw materials in percentage by mass:
Figure BDA0003236194360000031
preferably, the chain extender is one or more of ethylene glycol, 1, 4-butanediol, diethylene glycol, 1, 3-propanediol, dipropylene glycol or 1, 6-hexanediol. Further preferably 1, 4-butanediol.
Preferably, the heat-conducting filler is one or more of fibrous high-heat-conducting carbon powder, flaky high-heat-conducting carbon powder or alpha-alumina. Further preferably scaly highly thermally conductive carbon powder.
Preferably, the antioxidant is one or more of 1076, 1010, 1135, 318, or 339.
Preferably, the catalyst is one or more of organotin, organozinc or organozirconium.
Preferably, the defoamer polyether polyol has a number average molecular weight of 1000-.
The preparation method of the reactive flame-retardant heat-conducting polyurethane electronic pouring sealant comprises the following steps:
(1) firstly, carrying out reaction on polyoxypropylene ether polyol, polytetrahydrofuran ether polyol, diisocyanate, isocyanate polysilsesquioxane and a plasticizer according to the formula ratio at the temperature of 70-85 ℃ for 1-3 hours to obtain a prepolymer with the content of isocyanic acid radical of 7.0-18.0 wt% and obtain a component A;
(2) dehydrating the chain extender, the polyoxypropylene ether polyol, the reactive flame-retardant polyether polyol, the heat-conducting filler, the defoaming agent polyether polyol, the catalyst and the antioxidant in a vacuum at the temperature of 100-110 ℃ and the pressure of-0.095 MPa until the moisture content is less than 0.03 percent to obtain a component B;
(3) mixing A, B components according to a weight ratio of 100: 90-120, the mixing temperature is 30-40 ℃, the mixture is cast into a mold with the temperature of 30-35 ℃ for reaction, and the reaction type flame-retardant heat-conducting polyurethane electronic pouring sealant is obtained after curing at room temperature.
Compared with the prior art, the invention has the following beneficial effects:
(1) the low-viscosity flame-retardant polyether polyol is prepared by adopting the bimetallic catalyst through a one-step method, no post-treatment process is needed, the preparation method is simple, the discharge of three wastes is less, the viscosity is moderate, and the method is suitable for industrial production; flame-retardant bromine is introduced into a co-initiator to prepare reaction (structure) flame-retardant polyether without micromolecule migration; the introduced benzene ring structure can effectively improve the heat resistance of the polyurethane network;
(2) when the pouring sealant is prepared, the polysilsesquioxane modified by isocyanate is utilized, the Si-O structure is doped into the polyurethane network, the high-temperature service performance of the pouring sealant is improved, and the stability of the polyurethane network is obviously improved by taking the cage structure as a cross-linking point;
(3) when the pouring sealant is prepared, the defoaming agent polyether is added, so that the pouring sealant has good intersolubility in a pouring sealant system, on one hand, a large amount of bubbles generated when the A/B components are mixed can be effectively reduced, and on the other hand, the defoaming agent can be quickly defoamed as a surfactant;
(4) when the pouring sealant is prepared, the added heat-conducting filler uses the heat-conducting particles with the two-dimensional structure, so that the heat-conducting area can be effectively increased, and the heat-conducting property of the electronic pouring sealant is effectively improved.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the practice of the invention.
The formula system of the invention comprises the following components:
polytetrahydrofuran ether polyol PTMG1000 has the functionality of 2 and the molecular weight of 1000;
polytetrahydrofuran ether polyol PTMG2000 has functionality of 2 and molecular weight of 2000.
Polyether polyols are all produced by Nowey New materials, Inc., and have the following specific designations:
low molecular weight polyether polyols series:
INOVOL C204(2 functionality 400 molecular weight);
INOVOL C207(2 functionality 700 molecular weight);
INOVOL C305(3 functionality 500 molecular weight);
INOVOL C310(3 functionality 1000 molecular weight).
Bisphenol a polyether polyol series:
INOVOL S207H (2 functionality 700 molecular weight);
INOVOL S210H (2 functionality 1000 molecular weight);
INOVOL S220H (2 functionality 2000 molecular weight).
Polyoxypropylene ether polyols series:
INOVOL F3600(3 functionality 6000 molecular weight);
INOVOL F330N (3 functionality 5000 molecular weight);
INOVOL C210(2 functionality 1000 molecular weight);
INOVOL C220(2 functionality 2000 molecular weight);
INOVOL C230(2 functionality 3000 molecular weight);
INOVOL C240A (2 functionality 4000 molecular weight).
Defoamer polyether polyol series:
INOVOL S01X；
INOVOL S02X；
INOVOL S1200。
example 1
Preparing reactive flame-retardant polyether polyol:
adding INOVOL C305150 g, bisphenol A polyether S207H 150g and tribromophenol 330g into a pressure-resistant container, replacing 3 times with nitrogen, heating to 110 ℃ for dehydration for 2h, heating to 135 ℃ for dropwise adding 40g of propylene oxide for initiation, slowly feeding 360g of propylene oxide after the pressure is reduced to-0.06 MPa, controlling the pressure to be less than 0.30MPa in the reaction process, carrying out internal pressure reaction for 2h, removing monomers for 0.5h, and discharging.
The polyether was tested for hydroxyl number 110mg KOH/g and viscosity 824mpa s.
Preparing a polyurethane electronic pouring sealant:
the component A comprises the following components in percentage by mass: 40% of MDI, 10% of isocyanate polysilsesquioxane, 100010% of PTMG, 21010% of C, 330N 10% of F, 2305% of C and 15% of dioctyl phthalate, and reacting for 1 hour at 80 ℃ to obtain a prepolymer with 11% of isocyanate group;
the component B comprises the following components in percentage by mass: 15% of reactive flame-retardant polyether polyol, 10% of chain extender 1, 4-butanediol, 20% of fibrous high-thermal-conductivity carbon powder, 10% of defoamer polyether S01X 10, F360015%, C23015%, C240A 14%, dibutyltin dilaurate: 0.2%, antioxidant 1076: 0.8 percent, and vacuum dehydration is carried out at 100 ℃ and under the pressure of-0.095 MPa until the moisture is less than 0.03 percent.
The component A and the component B are 100 percent by mass: 110, the mixing temperature is 40 ℃, the mixture is cast into a mould with the temperature of 30 ℃ for reaction, and the polyurethane elastomer product is obtained after curing for 7 days at room temperature for standby test.
Example 2
Preparing reactive flame-retardant polyether polyol:
adding INOVOL C310100 g, bisphenol A polyether S210H 100g,2, 4-dichlorobenzyl alcohol 265g and tribromophenol 50g into a pressure-resistant container, replacing for 3 times by nitrogen, heating to 110 ℃ for dehydration for 2h, heating to 132 ℃, dropwise adding 62g of propylene oxide for initiation, slowly feeding 388g of propylene oxide after the pressure is reduced to-0.04 MPa, controlling the pressure to be less than 0.30MPa in the reaction process, carrying out internal pressure reaction for 2h, removing monomers for 0.5h, and discharging.
The polyether was tested for a hydroxyl number of 153mg KOH/g and a viscosity of 602 mPa. multidot.s.
Preparing a polyurethane electronic pouring sealant:
the component A comprises the following components in percentage by mass: HDI 38%, isocyanate polysilsesquioxane 12%, PTMG 100015%, C22010%, F330N 8%, C2309% and plasticizer 8%; reacting for 1.5 hours at 80 ℃ to obtain a prepolymer with the content of isocyanate groups of 14.4 percent;
the component B comprises the following components in percentage by mass: 20% of reactive flame-retardant polyether polyol, 12% of chain extender 1,4 butanediol, 15% of fibrous high-thermal-conductivity carbon powder, S02X 8% of defoamer polyether, F360013%, C23013%, C240A 10%, C240A 8%, dibutyltin dilaurate serving as catalyst: 0.3%, antioxidant 1010: 0.7 percent, and vacuum dehydration is carried out at 100 ℃ and under the pressure of-0.095 MPa until the moisture is less than 0.03 percent.
The component A and the component B are 100 percent by mass: 100, the mixing temperature is 40 ℃, the mixture is cast into a mold with the temperature of 30 ℃ for reaction, and the polyurethane elastomer product is obtained after curing for 7 days at room temperature for standby test.
Example 3
Preparing reactive flame-retardant polyether polyol:
adding INOVOL C204100 g, bisphenol A polyether S220H 120g and tetrabromobisphenol A300 g into a pressure-resistant container, replacing 3 times with nitrogen, heating to 110 ℃ for dehydration for 2h, heating to 130 ℃, dropwise adding 50g of propylene oxide for initiation, slowly feeding 850g of propylene oxide after the pressure is reduced to-0.07 MPa, controlling the pressure to be less than 0.30MPa in the reaction process, carrying out internal pressure reaction for 2h, removing monomers for 0.5h, and discharging.
The hydroxyl value of the tested polyether is 80mg KOH/g, and the viscosity is 6420mpa & s.
Preparing a polyurethane electronic pouring sealant:
the component A comprises the following components in percentage by mass: MDI-5040%, isocyanate polysilsesquioxane 11%, PTMG 200010%, C2107%, F330N 10%, C2205%, and plasticizer 17%; reacting for 1.5 hours at 80 ℃ to obtain a prepolymer with isocyanate content of 10.6 percent;
the component B comprises the following components in percentage by mass: 22% of reactive flame-retardant polyether polyol, 9% of chain extender 1, 4-butanediol, 18% of fibrous high-thermal-conductivity carbon powder, 01X 9% of defoaming agent polyether S, 360016% of F, 23016% of C, 240A 9% of catalyst dibutyltin dilaurate: 0.2%, antioxidant 1135: 0.8 percent. Vacuum dehydrating at 105 deg.C and below-0.095 MPa until the water content is less than 0.03%.
The component A and the component B are 100 percent by mass: 100, the mixing temperature is 40 ℃, the mixture is cast into a mold with the temperature of 30 ℃ for reaction, and the polyurethane elastomer product is obtained after curing for 7 days at room temperature for standby test.
Comparative example 1
Adding INOVOL C305125 g and bisphenol A polyether S207H 175g into a pressure-resistant container, replacing 3 times with nitrogen, heating to 110 ℃ for dehydration for 2h, heating to 135 ℃, dropwise adding 37g of propylene oxide for initiation, slowly feeding 300g of propylene oxide after the pressure is reduced to-0.06 MPa, controlling the pressure to be less than 0.30MPa in the reaction process, reacting for 2h under internal pressure, removing monomers for 0.5h, and discharging.
The polyether was tested for hydroxyl number 111mg KOH/g and viscosity 730mPa s.
Preparing a polyurethane electronic pouring sealant:
the component A comprises the following components in percentage by mass: 40% of MDI, 10% of isocyanate polysilsesquioxane, 100010% of PTMG, 21010% of C, 330N 10% of F, 2305% of C and 15% of dioctyl phthalate, and reacting for 1 hour at 80 ℃ to obtain a prepolymer with 11% of isocyanate group;
the component B comprises the following components in percentage by mass: 15% of reactive flame-retardant polyether polyol, 10% of chain extender 1, 4-butanediol, 20% of fibrous high-thermal-conductivity carbon powder, 10% of defoamer polyether S01X 10, F360015%, C23015%, C240A 14%, dibutyltin dilaurate: 0.2%, antioxidant 1076: 0.8 percent, and vacuum dehydration is carried out at 100 ℃ and under the pressure of-0.095 MPa until the moisture is less than 0.03 percent.
The component A and the component B are 100 percent by mass: 110, the mixing temperature is 40 ℃, the mixture is cast into a mould with the temperature of 30 ℃ for reaction, and the polyurethane elastomer product is obtained after curing for 7 days at room temperature for standby test.
Comparative example 2
Preparing a polyurethane electronic pouring sealant:
the component A comprises the following components in percentage by mass: 42% of HDI, 100015% of PTMG, 22012% of C, 330N 11% of F, 23012% of C and 8% of plasticizer; reacting for 1.5 hours at 80 ℃ to obtain a prepolymer with the content of isocyanate groups of 14.4 percent;
the component B comprises the following components in percentage by mass: 20% of reactive flame-retardant polyether polyol (flame-retardant polyether polyol synthesized in example 2), 12% of chain extender 1, 4-butanediol, 15% of fibrous high-thermal-conductivity carbon powder, defoamer polyether S02X 8, F360013, C23013, C240A 10, C240A 8, catalyst dibutyltin dilaurate: 0.3%, antioxidant 1010: 0.7 percent, and vacuum dehydration is carried out at 100 ℃ and under the pressure of-0.095 MPa until the moisture is less than 0.03 percent.
The hardness is measured according to GB/T531.1-2008 standard;
viscosity was measured according to GB/T12008.8-1992;
the flame retardant rating is tested according to UL-94 standard;
the thermal conductivity was tested according to GB/T3139-2005 standard.
TABLE 1 test results for the examples and comparative examples
Figure BDA0003236194360000071
The above-mentioned embodiments are intended to illustrate the technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, additions, equivalents, etc. made within the scope of the principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A preparation method of low-viscosity reactive flame-retardant polyether polyol is characterized by comprising the following steps:
the low-viscosity reactive flame-retardant polyether polyol is obtained by taking low-molecular-weight polyether, bisphenol A polyether and halogen-containing aromatic alcohol/phenol as composite initiators and carrying out polymerization reaction with alkylene oxide under the action of a bimetallic catalyst.
2. The process for preparing a low viscosity reactive flame retardant polyether polyol as claimed in claim 1, wherein: the functionality of the low molecular weight polyether is 2-3, and Mn is more than or equal to 500 and less than or equal to 1000.
3. The process for preparing a low viscosity reactive flame retardant polyether polyol as claimed in claim 1, wherein: the halogen-containing aromatic alcohol/phenol is one or more of 2, 3-dibromo-4, 5-dihydroxy benzyl alcohol, 2, 4-dichlorobenzyl alcohol, 5-chloro-2-hydroxy benzyl alcohol, 3- (3-bromophenyl) -2-propyne-1-ol, tetrabromobisphenol A, 5-bromo-2-hydroxy benzyl alcohol or tribromophenol.
4. A reactive flame-retardant heat-conducting polyurethane electronic pouring sealant prepared by utilizing low-viscosity reactive flame-retardant polyether polyol is characterized in that: comprises a component A and a component B, wherein,
the component A comprises: comprises diisocyanate, isocyanate group cage type polysilsesquioxane, polypropylene oxide polyether polyol, polytetrahydrofuran polyether polyol and a plasticizer;
and B component: comprises a chain extender, reactive flame-retardant polyether polyol, defoaming agent polyether polyol, heat-conducting filler, polypropylene oxide polyether polyol, a catalyst and an antioxidant;
the isocyanate group cage type polysilsesquioxane is prepared by reacting diisocyanate and tetrahydrofuran solution of hydroxyl-terminated cage type silsesquioxane, wherein the mass percentage of the hydroxyl-terminated cage type silsesquioxane is 30-50%, and the reaction temperature is 60-80 ℃;
the functionality of the reactive flame-retardant polyether polyol is 2-3, the hydroxyl value is 56-165mg KOH/g, and the viscosity is 700-15500mpa & s.
5. The reactive flame-retardant heat-conducting polyurethane electronic pouring sealant as claimed in claim 4, wherein: the component A comprises the following raw materials in percentage by mass:
Figure FDA0003236194350000011
6. the reactive flame-retardant heat-conducting polyurethane electronic pouring sealant as claimed in claim 4, wherein: the diisocyanate is one or more of diphenylmethane diisocyanate, HDI, IPDI or toluene diisocyanate;
the plasticizer is one or more of dioctyl phthalate, dioctyl sebacate, trioctyl trimellitate, epoxidized soybean oil or dibutyl phthalate.
7. The reactive flame-retardant heat-conducting polyurethane electronic pouring sealant as claimed in claim 4, wherein: the polyoxypropylene ether polyol has a number average molecular weight of 1000-6000 and a functionality of 2 or 3.
8. The reactive flame-retardant heat-conducting polyurethane electronic pouring sealant as claimed in claim 4, wherein: the component B comprises the following raw materials in percentage by mass:
Figure FDA0003236194350000021
9. the reactive flame-retardant heat-conducting polyurethane electronic pouring sealant as claimed in claim 4, wherein: the chain extender is one or more of ethylene glycol, 1, 4-butanediol, diethylene glycol, 1, 3-propylene glycol, dipropylene glycol or 1, 6-hexanediol;
the heat-conducting filler is one or more of fibrous high-heat-conducting carbon powder, flaky high-heat-conducting carbon powder or alpha-alumina;
the antioxidant is one or more of 1076, 1010, 1135, 318 or 339;
the catalyst is one or more of organic tin, organic zinc or organic zirconium.
10. A method for preparing the reactive flame-retardant heat-conducting polyurethane electronic pouring sealant as claimed in any one of claims 3 to 9, which is characterized in that: the method comprises the following steps:
(1) firstly, carrying out reaction on polyoxypropylene ether polyol, polytetrahydrofuran ether polyol, diisocyanate, isocyanate polysilsesquioxane and a plasticizer according to the formula ratio at the temperature of 70-85 ℃ for 1-3 hours to obtain a prepolymer with the content of isocyanic acid radical of 7.0-18.0 wt% and obtain a component A;
(2) dehydrating the chain extender, the polyoxypropylene ether polyol, the reactive flame-retardant polyether polyol, the heat-conducting filler, the defoaming agent polyether polyol, the catalyst and the antioxidant in a vacuum at the temperature of 100-110 ℃ and the pressure of-0.095 MPa until the moisture content is less than 0.03 percent to obtain a component B;
(3) mixing A, B components according to a weight ratio of 100: 90-120, the mixing temperature is 30-40 ℃, the mixture is cast into a mold with the temperature of 30-35 ℃ for reaction, and the reaction type flame-retardant heat-conducting polyurethane electronic pouring sealant is obtained after curing at room temperature.
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