Two-component polyurethane pouring sealant and preparation method thereof

Abstract

The invention provides a two-component polyurethane pouring sealant and a preparation method thereof, the two-component polyurethane pouring sealant comprises a component A and a component B, the mass ratio of the component A to the component B is 1: 0.8-3, the component A comprises the following components by weight: 30-95 parts of first modified vegetable oil polyol, 0-40 parts of vegetable oil polyol, 5-30 parts of a plasticizer, and 0.01-0.5 part of a catalyst; the component B comprises the following component in parts by weight: 2-15 parts of polyether polyol; 15 to 40 parts of second modified vegetable oil polyol; 30 to 50 parts of isocyanate; 3-30 parts of a plasticizer; and 3-50 parts of a flame retardant. Hydrophobic groups are added into molecular chains of various modified vegetable oil polyols, so that the problem that components in the pouring sealant react with oxygen elements to form an adhesive curing finished product is solved, meanwhile, the mechanical property and the double 85 resistance are improved, the water absorption rate is reduced, and the pouring sealant is suitable for electronic equipment in a high-heat and high-humidity environment for a long time.

Description

Technical Field

[0001] The present application belongs to the technical field of potting adhesives, and more specifically, relates to a two-component polyurethane potting adhesive and a preparation method thereof. Background Art

[0002] In the electronic equipment industry, two-component transparent polyurethane potting glue is widely used for circuit board sealing and waterproofing, especially on components that are sensitive to moisture. It can effectively isolate the components from external moisture, thereby maintaining stable operation of the equipment.

[0003] The more commonly used two-component transparent polyurethane potting glue is easy to cause the adhesive to cure, and there are problems such as insufficient resistance to double 85 aging and high water absorption. For example, electronic water meters are in a high humidity environment for a long time, and the components are easily corroded by water vapor, causing quality problems. At the same time, because it follows the national standards for mechanical water meters, manufacturers will recall water meters for repair in a short period of time, which not only causes considerable trouble to users, but also causes considerable economic losses to manufacturers. Other products such as washing machines, water heaters, refrigerators, etc. also have similar problems. Summary of the invention

[0004] Based on this, the purpose of this application is to provide a method for preparing a two-component polyurethane potting glue to solve the technical problems in the prior art that the currently more common two-component transparent polyurethane potting glue is easy to cause the adhesive to solidify into a finished product, has insufficient resistance to double 85 aging, and has a high water absorption rate.

[0005] Another object of the present application is to provide a method for preparing a two-component polyurethane potting adhesive.

[0006] In order to achieve the above-mentioned invention object, the technical solution of this application is as follows:

[0007] A two-component polyurethane potting adhesive comprises a component A and a component B, wherein the mass ratio of the component A to the component B is 1:0.8-3, and the component A comprises the following components in parts by weight:

[0008]

[0009] Component B includes the following components in parts by weight:

[0010]

[0011] Optionally, the first modified vegetable oil polyol and the second modified vegetable oil polyol are respectively prepared by using vegetable oil polyol through at least one of the methods of cracking, hydrogenation, esterification, and adding benzene ring structure.

[0012] Optionally, the viscosity of the first modified vegetable oil polyol and the second modified vegetable oil polyol is 300 mPa.s-4000 mPa.s respectively.

[0013] Optionally, the first modified vegetable oil polyol includes at least one of castor oil modified polyol, modified anacardic acid, modified palm oil polyol, modified cashew nut shell oil polyol, modified polylactic acid polyol, modified olive oil polyol, carboxylic acid, modified carboxylic acid polyol, 2-methylcarboxylic acid and modified soybean oil polyol.

[0014] Optionally, the second modified vegetable oil polyol includes at least one of castor oil modified polyol, modified anacardic acid, modified palm oil polyol, modified cashew nut shell oil polyol, modified polylactic acid polyol, modified olive oil polyol, cardiotonic acid, modified cardiotonic acid polyol, 2-methyl cardiotonic acid and modified soybean oil polyol; the first modified vegetable oil polyol is the same or different from the second modified vegetable oil polyol.

[0015] Optionally, the polyether polyol includes at least one of polyoxypropylene diol, polyoxypropylene triol, polytetrahydrofuran diol, polytetrahydrofuran triol, tetrahydrofuran-oxypropylene copolymer diol and tetrahydrofuran-oxypropylene triol.

[0016] Optionally, the viscosity of the polyether polyol is 300 mPa.s-4000 mPa.s.

[0017] Optionally, the isocyanate is at least one of toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene diisocyanate (HDI), liquefied MDI and crude MDI (PAPI).

[0018] Optionally, the plasticizer is at least one of tributyl citrate, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, methyl oleate, esterified tributyl citrate, short-chain paraffin, diisononyl phthalate and dioctyl terephthalate.

[0019] Optionally, the flame retardant is at least one of toluene diphenyl phosphate, triethyl phosphate, tricresyl phosphate, tributyl phosphate, dimethyl methyl phosphate and diethyl ethyl phosphate.

[0020] Optionally, the catalyst is at least one of organic tin, organic bismuth and organic tin.

[0021] And, a preparation method of a two-component polyurethane potting adhesive, used to prepare the above two-component polyurethane potting adhesive, the preparation method comprising the following steps:

[0022] The first modified vegetable oil polyol and the plasticizer in component A are mixed, vacuum-dehydrated in a high temperature environment, cooled, and then a catalyst is added to obtain component A;

[0023] The polyether polyol, the second modified vegetable oil polyol, the plasticizer and the flame retardant in component B are mixed, vacuum-dried in a high temperature environment, cooled, and then isocyanate is added to react at 60°C-100°C until the NCO% content meets the preset requirements.

[0024] The beneficial effects of this application include:

[0025] The two-component polyurethane potting adhesive provided by the present application includes component A and component B. Component A and component B are separately packaged before use. The two-component polyurethane potting adhesive of the present application uses a combination of a first modified vegetable oil polyol of component A and a second modified vegetable oil polyol, polyether polyol, plasticizer, flame retardant, and isocyanate of component B. Hydrophobic groups are added to the molecular chains of various modified vegetable oil polyols, thereby reducing the problem of components in the potting adhesive reacting with oxygen elements during use to form a cured adhesive product. At the same time, the mechanical properties and heat resistance are improved, and the water absorption rate is reduced. The two-component polyurethane potting adhesive is suitable for electronic equipment that is exposed to high heat and high humidity environments for a long time.

[0026] The preparation method of the two-component polyurethane potting adhesive provided in the present application follows the chemical properties and physical properties of each component in the two-component polyurethane potting adhesive, can prepare a preset two-component polyurethane potting adhesive, is simple to operate, has high production efficiency, and has good prospects for industrial promotion. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] Terminology

[0029] The double 85 aging in the embodiment of the present application refers to aging the product under the condition of 85° C. / 85% RH and comparing the performance changes of the product before and after aging.

[0030] Liquefied MDI is a polyurethane raw material in liquid form made from diphenyl diisocyanate (MDI).

[0031] Crude MDI or PAPI, polymethylene polyphenyl polyisocyanate.

[0032] Currently, the more commonly used polyurethane potting glue formula generally uses vegetable oil polyols as the basic material, such as the castor oil system. During the research process, it was found that castor oil polyols contain unsaturated bonds. If used in combination with polyether polyols, the polyether polyols have a high content of oxygen. The unsaturated bonds of castor oil polyols will react with the oxygen elements of the polyether polyols to form a cured adhesive product, affecting the normal use of the polyurethane potting glue, and will further cause problems such as insufficient resistance to double 85 aging and high water absorption.

[0033] Therefore, the embodiment of the present application provides a two-component polyurethane potting adhesive, including component A and component B, the mass ratio of component A to component B is 1:0.8-3, and component A includes the following components in parts by weight:

[0034]

[0035] Component B includes the following components in parts by weight:

[0036]

[0037]

[0038] The two-component polyurethane potting adhesive provided in the embodiment of the present application includes component A and component B, and component A and component B are separately packaged before use. The two-component polyurethane potting adhesive in the embodiment of the present application uses a combination of a first modified vegetable oil polyol of component A and a second modified vegetable oil polyol, polyether polyol, plasticizer, flame retardant, and isocyanate of component B, and adds hydrophobic groups to the molecular chains of various modified vegetable oil polyols, thereby reducing the problem of components in the potting adhesive reacting with oxygen elements during use to form a cured adhesive product, while improving mechanical properties and resistance to 85, reducing water absorption, and being suitable for electronic equipment that is in a high heat and high humidity environment for a long time.

[0039] In the embodiments of the present application, the vegetable oil polyol may be, for example, palm oil polyol, cashew nut shell oil polyol, soybean oil polyol, polylactic acid polyol, castor oil polyol, olive oil polyol or a vegetable oil polyol commonly used in polyurethane potting adhesives. In the various modified vegetable oil polyols, polyether polyols and isocyanate systems of the two-component polyurethane potting adhesive in the embodiments of the present application, component A may be allowed to contain an appropriate amount of vegetable oil polyol, for example, a content of less than 40 parts by weight. If the content of vegetable oil polyol in component A exceeds 40 parts, the potting adhesive may form a cured product with a high water absorption rate.

[0040] In some embodiments of the present application, the first modified vegetable oil polyol and the second modified vegetable oil polyol are respectively made by preparing vegetable oil polyol by at least one of the methods including cracking, hydrogenation, esterification, and adding benzene ring structure, and hydrophobic groups are introduced or generated in the molecular chain of the modified vegetable oil polyol, such as benzene rings, long hydrocarbon chains, etc.

[0041] In some embodiments of the present application, the first modified vegetable oil polyol includes at least one of castor oil modified polyol, modified anacardic acid, modified palm oil polyol, modified cashew nut shell oil polyol, modified polylactic acid polyol, modified olive oil polyol, carboxylic acid, modified carboxylic acid polyol, 2-methylcarboxylic acid and modified soybean oil polyol.

[0042] In some embodiments of the present application, the second modified vegetable oil polyol includes at least one of castor oil modified polyol, modified anacardic acid, modified palm oil polyol, modified cashew nut shell oil polyol, modified polylactic acid polyol, modified olive oil polyol, carboxylic acid, modified carboxylic acid polyol, 2-methylcarboxylic acid and modified soybean oil polyol.

[0043] Castor oil modified polyols such as bio-based modified castor oil polyol JT-805, BASF 805, etc.

[0044] The above-mentioned modified vegetable oil polyols all contain hydrophobicity, and can react with polyether polyols and isocyanates when component A and component B are mixed to generate a stable cross-linked structure network, reduce water absorption, and improve double 85 resistance and tensile strength.

[0045] It is understood that the first modified vegetable oil polyol can be the same as or different from the second modified vegetable oil polyol.

[0046] In some embodiments of the present application, the viscosity of the first modified vegetable oil polyol and the second modified vegetable oil polyol are 300mPa.s-4000mPa.s, respectively. If the viscosity of the first modified vegetable oil polyol is too low, for example, lower than 300mPa.s, component A is too thin, and when component A is mixed with component B, the reaction rate will slow down, and the drying speed of the potting compound may be reduced; if the viscosity of the first modified vegetable oil polyol is too high, component A is too thick, which will increase the difficulty of mixing component A and component B, and may cause problems with uniform mixing.

[0047] In some embodiments of the present application, similar problems may occur when the viscosity of the second modified vegetable oil polyol is too low or too high.

[0048] In some embodiments of the present application, the polyether polyol includes at least one of polyoxypropylene diol, polyoxypropylene triol, polytetrahydrofuran diol, polytetrahydrofuran triol, tetrahydrofuran-oxypropylene copolymer diol and tetrahydrofuran-oxypropylene triol.

[0049] In some embodiments of the present application, the viscosity of the polyether polyol is 300 mPa.s-4000 mPa.s.

[0050] In some embodiments of the present application, the isocyanate is at least one of toluene diisocyanate (TDI), isophorone diisocyanate (IPDI), diphenylmethane diisocyanate (MDI), dicyclohexylmethane diisocyanate (HMDI), hexamethylene diisocyanate (HDI), liquefied MDI and crude MDI (PAPI).

[0051] In some embodiments of the present application, the plasticizer is at least one of tributyl citrate, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, methyl oleate, esterified tributyl citrate, short-chain paraffin, diisononyl phthalate and dioctyl terephthalate.

[0052] In some embodiments of the present application, the flame retardant is at least one of toluene diphenyl phosphate, triethyl phosphate, tricresyl phosphate, tributyl phosphate, dimethyl methyl phosphate and diethyl ethyl phosphate.

[0053] In some embodiments of the present application, the catalyst is at least one of organic tin, organic bismuth, and organic thiocyanate, and the organic tin, organic bismuth, and organic thiocyanate are alkyl compounds of tin, bismuth, and thiocyanate or their derivative compounds, such as trimethyltin, triethyltin, tributyltin, bismuth isooctanoate, bismuth dilaurate, bismuth neodecanoate, bis(cyclopentadiene) zirconium dihydride, zirconium acetate, bis(n-butylcyclopentadienyl) zirconium dichloride, bis(cyclopentadiene) zirconium dichloride, etc. The catalyst mainly plays the role of initiating and promoting the reaction of the first modified vegetable oil polyol, the polyether polyol, the second modified vegetable oil polyol and the isocyanate.

[0054] In some embodiments of the present application, component A also includes a defoamer, the weight content of the defoamer is 0-2 parts, and it is mainly used to reduce the surface tension in the two-component polyurethane potting glue, so that bubbles are more easily released from the colloid. In this way, the product is not prone to bubble problems during the production process, and the overall quality of the product is improved. In addition, the defoamer can also improve the fluidity and wettability of the two-component polyurethane potting glue, making the product easier to operate and process.

[0055] The defoamer may be an organosilicon defoamer, such as silicone oil, polydimethylsiloxane, polyether polysiloxane, etc. The present application also provides a method for preparing the above two-component polyurethane potting adhesive, the method comprising the following steps:

[0056] S1: The first modified vegetable oil polyol and the plasticizer in component A are mixed, vacuum-dehydrated in a high temperature environment, cooled, and then a catalyst is added to obtain component A.

[0057] In some embodiments, in step S1, the temperature of vacuum dehydration is 95°C-150°C, and the dehydration time can be set according to the actual dehydration situation, for example, 1h-4h can be selected, etc. If the dehydration situation does not meet expectations, the time can be appropriately extended.

[0058] The cooling temperature is below 50°C to prevent the catalyst from reacting when added.

[0059] S2: The polyether polyol, the second modified vegetable oil polyol, the plasticizer and the flame retardant in component B are mixed, vacuum-dried in a high temperature environment, cooled, and then isocyanate is added to react at 60°C-100°C until the NCO% content meets the preset requirements.

[0060] In some embodiments, in step S2, the temperature of vacuum dehydration is 95°C-150°C, and the dehydration time can be set according to the actual dehydration situation, for example, 1h-4h can be selected, etc. If the dehydration situation does not meet expectations, the time can be appropriately extended.

[0061] The cooling temperature is below 40°C-60°C.

[0062] The preparation method of the two-component polyurethane potting adhesive provided in the embodiment of the present application follows the chemical properties and physical properties of each component in the two-component polyurethane potting adhesive, can prepare a preset two-component polyurethane potting adhesive, is simple to operate, has high production efficiency, and has good prospects for industrial promotion.

[0063] The following examples are used to illustrate.

[0064] Example 1

[0065] The two-component polyurethane potting adhesive of this embodiment includes component A and component B, the mass ratio of component A to component B is 1:1, and component A includes the following components in parts by weight:

[0066]

[0067] Component B includes the following components in parts by weight:

[0068]

[0069] The modified castor oil polyol is bio-based modified castor oil polyol JT-805;

[0070] The modified cardiac acid polyol is prepared by hydrogenating cardiac acid polyol.

[0071] The preparation method of the two-component polyurethane potting adhesive of this embodiment comprises the following steps:

[0072] S1: The modified castor oil polyol, castor oil polyol, modified cardiac acid polyol, plasticizer and defoamer in component A are mixed, vacuum dewatered for 2 hours at 100° C., cooled to below 50° C., and then a catalyst is added to obtain component A.

[0073] S2: Mix the polyoxypropylene glycol, modified castor oil polyol, plasticizer and flame retardant in component B, dehydrate them under vacuum at 110°C for 2 hours, cool them to below 50°C, then add isocyanate and react at 100°C until the NCO% content meets the preset requirements.

[0074] Example 2

[0075] The two-component polyurethane potting adhesive of this embodiment includes component A and component B, the mass ratio of component A to component B is 1:2, and component A includes the following components in parts by weight:

[0076]

[0077] Component B includes the following components in parts by weight:

[0078]

[0079] The modified castor oil polyol is bio-based modified castor oil polyol JT-805.

[0080] The preparation method of the two-component polyurethane potting adhesive of this embodiment comprises the following steps:

[0081] S1: The modified castor oil polyol, castor oil polyol and plasticizer in component A are mixed, vacuum-dehydrated for 1.5 hours at 150° C., cooled to below 50° C., and then an organotin catalyst is added to obtain component A.

[0082] S2: The polyether polyol, modified castor oil polyol, plasticizer and flame retardant in component B are mixed, vacuum-dehydrated at 95°C for 4 hours, cooled to below 50°C, and then toluene diisocyanate is added and reacted at 90°C until the NCO% content meets the preset requirements.

[0083] Example 3

[0084] The two-component polyurethane potting adhesive of this embodiment includes component A and component B, the mass ratio of component A to component B is 1:1, and component A includes the following components in parts by weight:

[0085]

[0086] Component B includes the following components in parts by weight:

[0087]

[0088] The preparation method of the two-component polyurethane potting adhesive of this embodiment comprises the following steps:

[0089] S1: The modified cashew nut shell oil polyol FX9001, epoxy-modified soybean oil polyol and plasticizer in component A are mixed, vacuum-dehydrated for 4 hours at 95° C., cooled to below 50° C., and then the catalyst organotin is added to obtain component A.

[0090] S2: The polytetramethylene glycol, modified cashew nut shell oil polyol FX9001, plasticizer and flame retardant in component B are mixed, vacuum dehydrated for 2 hours at 105°C, cooled to below 60°C, and then toluene diisocyanate is added and reacted at 100°C until the NCO% content meets the preset requirements.

[0091] Example 4

[0092] The two-component polyurethane potting adhesive of this embodiment includes component A and component B, the mass ratio of component A to component B is 1:0.8, and component A includes the following components in parts by weight:

[0093]

[0094]

[0095] Component B includes the following components in parts by weight:

[0096]

[0097] The preparation method of the two-component polyurethane potting adhesive of this embodiment comprises the following steps:

[0098] S1: The modified cashew nut shell oil polyol FX9001, the plasticizer esterified tributyl citrate, the plasticizer, and the defoamer in component A are mixed, vacuum dewatered at 150° C. for 1.5 h, cooled to below 50° C., and then the catalyst organic bismuth is added to obtain component A.

[0099] S2: The tetrahydrofuran-propylene oxide copolymer glycol, epoxy-modified soybean oil polyol, plasticizer and flame retardant in component B are mixed, vacuum-dehydrated for 3 hours at 100°C, cooled to below 60°C, and then isophorone diisocyanate is added and reacted at 80°C until the NCO% content meets the preset requirements.

[0100] Example 5

[0101] The two-component polyurethane potting adhesive of this embodiment includes component A and component B, the mass ratio of component A to component B is 1:3, and component A includes the following components in parts by weight:

[0102]

[0103] Component B includes the following components in parts by weight:

[0104]

[0105]

[0106] The preparation method of the two-component polyurethane potting adhesive of this embodiment comprises the following steps:

[0107] S1: The modified castor oil polyol, plasticizer and defoamer in component A are mixed, vacuum dewatered at 150° C. for 2 h, cooled to below 50° C., and then a catalyst is added to obtain component A.

[0108] S2: Mix the polyoxypropylene glycol, modified castor oil polyol, plasticizer and flame retardant in component B, dehydrate them under vacuum at 100°C for 4 hours, cool them to below 45°C, then add liquefied MDI and crude MDI, and react at 100°C until the NCO% content meets the preset requirements.

[0109] Comparative Example 1

[0110] The two-component polyurethane potting adhesive of this comparative example includes component A and component B, the mass ratio of component A to component B is 1:1, and component A includes the following components in parts by weight:

[0111]

[0112] Component B includes the following components in parts by weight:

[0113]

[0114] The tensile strength, water absorption and double 85 resistance of the two-component polyurethane potting glue of Examples 1-5 and Comparative Example 1 were tested. The test method is as follows:

[0115] Tensile strength: Use a tensile testing machine to measure the tensile strength of the two-component polyurethane potting adhesive.

[0116] Water absorption rate: The mold aperture for making the standard sheet is 50±1mm and the depth is 3±0.2mm. Prepare a certain amount of two-component polyurethane potting glue products; mix the corresponding two-component polyurethane potting glue according to the proportions in Examples 1-5 and the comparative example, stir them thoroughly and evenly, and put them into a vacuum device for degassing. Slowly pour the completely degassed potting glue into a mold coated with a release agent for room temperature curing. After the potting glue is completely cured in the mold, gently remove the film with a blade. Note that the potting glue film cannot be damaged. Put the removed standard sheet into an oven for dehumidification for 1 hour, and set the oven temperature to 100℃. After dehumidification, take it out and cool it to room temperature for testing. Weigh the treated standard sheet as M1, at least accurate to 0.01g. Set the distilled water temperature of the constant temperature water bath to between 23±0.5℃. When the water temperature in the water tank is stable at 23±0.5℃, immerse the test piece in the water tank (24h±1h). Take out the sample, wipe it dry, and weigh the sample again, which is M2, accurate to 0.01g. Calculation formula: X% = (M2-M1) / M1*100% (average value for three parallel tests).

[0117] Double 85 resistance performance: Place the product in a constant temperature and humidity chamber at 85℃ and 85%RH to test the product's tolerance level in a harsh environment of high temperature and humidity.

[0118] The test results are shown in Table 1.

[0119] Table 1

[0120] Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Tensile strength / Mpa 0.45 0.4 0.8 0.7 1.0 0.5 Water absorption 0.28％ 0.30％ 0.20％ 0.25％ 0.18％ 0.7％ Double 85 resistance ≥1000h ≥1000h ≥1000h ≥1000h ≥1000h ＜450h

[0121] From the test results, it can be seen that the two-component polyurethane potting glue of Examples 1-5 has a tensile strength of 0.4-1.0Mpa, a water absorption rate of <0.3%, and a resistance to double 85 ≥1000h, which is significantly improved compared with the two-component polyurethane potting glue of Comparative Example 1. Among them, component A in Example 1-2 contains vegetable oil polyols, and component A in Example 3-5 does not contain vegetable oil polyols. The water absorption rate of the potting glue of Example 3-5 is better than that of Example 1-2.

[0122] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A two-component polyurethane potting adhesive, characterized in that: It comprises component A and component B, wherein the mass ratio of component A to component B is 1:0.8-3, and component A comprises the following components in parts by weight: 30-95 parts of the first modified vegetable oil polyol; 0-40 parts of vegetable oil polyol; 5-30 parts of plasticizer; Catalyst 0.01-0.5 parts; The B component includes the following components in parts by weight: 2-15 parts of polyether polyol; 15-40 parts of the second modified vegetable oil polyol; 30-50 parts of isocyanate; 3-30 parts of plasticizer; Flame retardant 3-50 parts.

2. The two-component polyurethane potting adhesive according to claim 1, characterized in that: The first modified vegetable oil polyol and the second modified vegetable oil polyol are respectively prepared by using vegetable oil polyol through at least one of the following methods: cracking, hydrogenation, esterification, and adding benzene ring structure; and / or, The viscosities of the first modified vegetable oil polyol and the second modified vegetable oil polyol are respectively 300 mPa.s-4000 mPa.s.

3. The two-component polyurethane potting adhesive according to claim 1 or 2, characterized in that: The first modified vegetable oil polyol includes at least one of castor oil modified polyol, modified anacardic acid, modified palm oil polyol, modified cashew nut shell oil polyol, modified polylactic acid polyol, modified olive oil polyol, carboxylic acid, modified carboxylic acid polyol, 2-methyl carboxylic acid and modified soybean oil polyol; and / or, The second modified vegetable oil polyol includes at least one of castor oil modified polyol, modified anacardic acid, modified palm oil polyol, modified cashew nut shell oil polyol, modified polylactic acid polyol, modified olive oil polyol, cardiac acid, modified cardiac acid polyol, 2-methyl cardiac acid and modified soybean oil polyol; the first modified vegetable oil polyol and the second modified vegetable oil polyol are the same or different.

4. The two-component polyurethane potting adhesive according to claim 1, characterized in that: The polyether polyol includes at least one of polyoxypropylene diol, polyoxypropylene triol, polytetrahydrofuran diol, polytetrahydrofuran triol, tetrahydrofuran-oxypropylene copolymer diol and tetrahydrofuran-oxypropylene triol.

5. The two-component polyurethane potting adhesive according to claim 4, characterized in that: The viscosity of the polyether polyol is 300mPa.s-4000mPa.s.

6. The two-component polyurethane potting adhesive according to claim 1, characterized in that: The isocyanate is at least one of toluene diisocyanate, isophorone diisocyanate, diphenylmethane diisocyanate, dicyclohexylmethane diisocyanate, hexamethylene diisocyanate, liquefied MDI and crude MDI.

7. The two-component polyurethane potting adhesive according to claim 1, characterized in that: The plasticizer is at least one of tributyl citrate, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, methyl oleate, esterified tributyl citrate, short-chain paraffin, diisononyl phthalate and dioctyl terephthalate.

8. The two-component polyurethane potting adhesive according to claim 1, characterized in that: The flame retardant is at least one of toluene diphenyl phosphate, triethyl phosphate, tricresyl phosphate, tributyl phosphate, dimethyl methyl phosphate and diethyl ethyl phosphate.

9. The two-component polyurethane potting adhesive according to claim 1, characterized in that: The catalyst is at least one of organic tin, organic bismuth and organic tin.

10. A method for preparing a two-component polyurethane potting adhesive, characterized in that: Used to prepare the two-component polyurethane potting adhesive according to any one of claims 1 to 9, the preparation method comprising the following steps: The first modified vegetable oil polyol and the plasticizer in the A component are mixed, vacuum-dried in a high temperature environment, cooled, and then the catalyst is added to obtain the A component; The polyether polyol, the second modified vegetable oil polyol, the plasticizer and the flame retardant in the B component are mixed, vacuum-dehydrated in a high temperature environment, cooled, and then isocyanate is added to react at 60° C.-100° C. until the NCO% content meets the preset requirements.

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