High-impact-resistance cold-bonding type multipurpose polyester adhesive as well as preparation method and application thereof

Abstract

The invention discloses a high-impact-resistance cold-bonding type multipurpose polyester adhesive as well as a preparation method and application thereof, and belongs to the technical field of adhesives. The polyester adhesive comprises the following components in percentage by mass: 45%-65% of unsaturated polyester resin, 0.2%-5% of a chain extender, 0.2%-5% of an accelerant, 1%-5% of a dispersing agent, 1%-5% of an organic filler, 20%-30% of an inorganic filler, 0.2%-5% of an anti-gel inhibitor, 5%-10% of a cross-linking agent, 1%-5% of a defoaming agent, 1%-1.5% of a curing agent, 3%-10% of a toughening agent and 1%-5% of a flatting agent. The preparation method comprises the following steps: proportioning unsaturated polyester resin, a chain extender, an anti-gel inhibitor, a cross-linking agent, a dispersing agent and the like according to a certain proportion, adding other auxiliaries, and uniformly stirring to obtain the cold-sticking type multipurpose polyester adhesive. After the curing agent is added into the prepared polyester adhesive, the polyester adhesive can react within a certain period of time, and after the adhesive is spontaneously heated to reach the curing temperature, all the components quickly react for curing, so that a cured product has relatively good mechanical property, toughness, heat resistance and corrosion resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesives and relates to a high-impact cold-adhesive multi-purpose polyester adhesive and a preparation method and application thereof. Background Art

[0002] At present, in the field of transformer manufacturing, electrical laminated paperboard is a key insulating material, and its performance stability and reliability have a decisive influence on the overall operation effect of the transformer. In the preparation process of electrical laminated paperboard, bonding technology plays a vital role. At present, the bonding technology widely used in the industry mainly relies on various types such as phenolic adhesives, epoxy adhesives, casein adhesives and polyester adhesives. These adhesives have their own characteristics. For example, phenolic adhesives have good heat resistance and corrosion resistance, while epoxy adhesives are known for their high strength and excellent electrical insulation properties. However, among many options, polyester adhesives have unique advantages in the preparation of laminated products due to their high strength, excellent weather resistance and good processing performance, and are therefore widely used in the manufacture of electrical laminated paperboard.

[0003] During the use of polyester adhesive, it needs to be combined with multiple components such as curing agent and accelerator. However, when the components are added together, they will react at room temperature to form a gel solidification. During the cold-pressed production process of ordinary polyester adhesive, it is easy to solidify prematurely, and the time left for technicians to apply glue is extremely limited. This not only increases the difficulty of operation and reduces production efficiency, but premature curing may also lead to uneven stress distribution inside the laminated product, which in turn causes quality problems such as cracking, seriously affecting the reliability and service life of the product.

[0004] In summary, it is urgent to develop a new type of adhesive that can prolong the cold pressing curing time, so as to adjust the technicians' glue brushing operation time with a stable time, and ultimately achieve the goal of improving production efficiency. Summary of the invention

[0005] The purpose of the present invention is to provide a high-impact cold-adhesive multi-purpose polyester adhesive and a preparation method and application thereof, so as to solve the technical problem in the prior art that the adhesive is easily cured prematurely when used in production, thereby shortening the operation time of technicians and affecting product quality.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a high impact resistance cold-adhesive multi-purpose polyester adhesive, which comprises, by mass percentage: 45%~65% unsaturated polyester resin, 0.2%~5% chain extender, 0.2%~5% accelerator, 1%~5% dispersant, 1%~5% organic filler, 20%~30% inorganic filler, 0.2%~5% anti-gel inhibitor, 5%~10% cross-linking agent, 1%~5% defoaming agent, 1%~1.5% curing agent, 3%~10% toughening agent and 1%~5% leveling agent.

[0007] Furthermore, the chain extender is 2,4-diphenyl-4-methyl-1-pentene; the accelerator is cobalt cyclohexaneate; and the dispersant is a suspended particle type dispersant for unsaturated polyester adhesive.

[0008] Furthermore, the anti-gel inhibitor is tert-butylcatechol or hydroquinone; the cross-linking agent is DAP; the defoaming agent is a defoaming agent for unsaturated polyester; and the curing agent is a mixture of MEKP and TBPB.

[0009] In a second aspect, the present invention provides a method for preparing the above-mentioned high impact resistant cold-adhesive multi-purpose polyester adhesive, comprising the following steps: Adding a chain extender, a accelerator, a dispersant, an organic filler and an inorganic filler to an unsaturated polyester resin, and stirring to obtain a first prefabricated material; Dissolving an anti-gel inhibitor in an organic solvent, adding a cross-linking agent, a defoaming agent and a curing agent, and stirring to obtain a second prefabricated material; Dissolving a solid toughening agent in an organic solvent or a liquid styrene toughening agent in a diluent, then adding a leveling agent, and stirring to obtain a third prefabricated material; The first prefabricated material, the second prefabricated material and the third prefabricated material are mixed and stirred to obtain a polyester adhesive.

[0010] Furthermore, the inorganic filler includes talc powder, dolomite powder, titanium dioxide and calcium carbonate powder with a mesh size of 300 to 800; the organic filler is DAP, ethylene, silicon-containing monomers or oligomers; and the organic solvent is acetone, ethanol or methanol.

[0011] Furthermore, the mass ratio of the talc powder, dolomite powder, titanium dioxide and calcium carbonate powder is (20-40): (0.5-3): (3-8): (3-8).

[0012] Furthermore, during the preparation of the first preform, the stirring speed is 1400 rpm to 2000 rpm, and the stirring temperature is room temperature.

[0013] Furthermore, during the preparation of the second preform, the stirring speed is 300 rpm to 400 rpm, and the stirring temperature is room temperature.

[0014] Furthermore, in the step of mixing the first prefabricated material, the second prefabricated material and the third prefabricated material and stirring to obtain the polyester adhesive, the stirring speed is 300 rpm to 400 rpm and the stirring temperature is room temperature.

[0015] In a third aspect, the present invention provides an application of the above-mentioned impact-resistant cold-adhesive multi-purpose polyester adhesive in electrical laminated paperboard for transformers, wherein the polyester adhesive is used to bond paperboard or wood board by curing at room temperature and cold pressing at 1MPa~8MPa to finally form laminated paperboard or laminated wood board.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses a method for preparing a high-impact cold-adhesive multi-purpose polyester adhesive, wherein unsaturated polyester resin, chain extender, anti-gel inhibitor, crosslinking agent and dispersant are mixed in a certain proportion, and other auxiliary agents are added, and the cold-adhesive multi-purpose polyester adhesive is prepared after being uniformly stirred. In the polyester adhesive prepared by the invention, after adding a curing agent, a reaction can occur within a certain period of time, and after the adhesive reaches the curing temperature through self-heating, the components react rapidly to cure, so that the cured product has good mechanical properties, toughness, heat resistance and corrosion resistance.

[0017] The present invention also provides a polyester adhesive and its application in laminated products. In the process of producing pressure-testing paperboard or wood board, the production process is similar to that of phenolic adhesive laminated paperboard, and the energy consumption cost is reduced during the pressing process; the mechanical strength including shear strength, peel strength, bending strength, etc. are better than phenolic adhesive laminated products; the dielectric properties, partial discharge, breakdown and other strength indicators are better than phenolic adhesive laminated products; the heat deformation temperature is higher than 120°C, and the laminated products can meet the E-level insulation level; the Tg transition temperature is high, it is not easy to crack after aging, and various properties can be kept unchanged under high temperature environment. The polyester adhesive of the present invention adopts a cold pressing process in the process of producing laminated products, but the board width can be increased, and the multi-layer press can increase the production volume by 5 to 10 times in one batch. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 The present invention is a flow chart of the preparation method. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0021] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0022] In this article, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0023] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0024] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings: The embodiment of the present invention discloses a high-impact cold-adhesive multi-purpose polyester adhesive, which comprises, by mass percentage, 45% to 65% of an unsaturated polyester resin, 0.2% to 5% of a chain extender, 0.2% to 5% of an accelerator, 1% to 5% of a dispersant, 1% to 5% of an organic filler, 20% to 30% of an inorganic filler, 0.2% to 5% of an anti-gel inhibitor, 5% to 10% of a cross-linking agent, 1% to 5% of a defoaming agent, 1% to 1.5% of a curing agent, 3% to 10% of a toughening agent, and 1% to 5% of a leveling agent.

[0026] It should be noted that the chain extender is AMSD, i.e., 2,4-diphenyl-4-methyl-1-pentene; the accelerator is cobalt cyclohexane acid; the dispersant is a suspended particle dispersant for unsaturated polyester glue; the anti-gel inhibitor is tert-butyl catechol or hydroquinone; the cross-linking agent is DAP; the defoaming agent is a defoaming agent for unsaturated polyester; and the curing agent is a mixture of MEKP and TBPB.

[0027] See also Figure 1 The embodiment of the present invention discloses a method for preparing the above-mentioned high impact resistant cold-adhesive multi-purpose polyester adhesive, comprising the following steps: S1, adding a chain extender, a accelerator, a dispersant, an organic filler and an inorganic filler to an unsaturated polyester resin, and stirring to obtain a first preform; In this step, the mass of the unsaturated polyester resin is 45-65% of the sum of the added amounts of each component; the accelerator is cobalt cyclohexaneate, and the mass of the accelerator is 0.2-5% of the sum of the added amounts of each component; the dispersant is an unsaturated polyester dispersant, and the mass of the dispersant is 1-5% of the sum of the added amounts of each component; the chain extender is AMSD, i.e., 2,4-diphenyl-4-methyl-1-pentene; the mass of the chain extender is 0.2%-5% of the sum of the added amounts of each component; the organic filler is a styrene, ethylene, or silicon-containing monomer or oligomer, and the mass of the organic filler is 1-5% of the sum of the added amounts of each component; the inorganic filler is talc powder, dolomite powder, titanium dioxide, and calcium carbonate powder of 300-3000 mesh, and the mass of the inorganic filler is 20%-30% of the sum of the added amounts of each component, and the mass ratio of talc powder, dolomite powder, titanium dioxide, and calcium carbonate powder is (20-40): (0.5-3): (3-8): (3-8). The stirring speed is 1400 rpm ~2000 rpm, and the stirring temperature is room temperature.

[0028] S2, dissolving an anti-gel inhibitor in an organic solvent, adding a cross-linking agent, a defoaming agent and a curing agent, and stirring to obtain a second preform; In this step, the anti-gel inhibitor is tert-butyl catechol or hydroquinone, and the mass of the anti-gel inhibitor is 0.2% to 5% of the sum of the added amounts of each component; the cross-linking agent is DAP, and the mass of DAP is 5 to 10% of the sum of the added amounts of each component; the curing agent is a mixed solvent of MEKP and TBPB, and the added amount of the curing agent is 1% to 1.5% of the sum of the added amounts of each component. The defoaming agent is a defoaming agent for unsaturated polyester, and the added amount of the defoaming agent is 1% to 5% of the sum of the added amounts of each component. The organic solvent is acetone, ethanol or methanol. The stirring speed is 300rpm to 400rpm, and the stirring temperature is room temperature.

[0029] S3, dissolving a solid toughening agent in an organic solvent or a liquid styrene toughening agent in a diluent, then adding a leveling agent, and stirring to obtain a third prefabricated material.

[0030] In this step, the amount of toughening agent added is 3% to 10% of the total amount of each component added, and the amount of leveling agent added is 1% to 5% of the total amount of each component added. The organic solvent is acetone, ethanol or methanol.

[0031] S4, mixing the first prefabricated material, the second prefabricated material and the third prefabricated material, and stirring to obtain a polyester adhesive.

[0032] In this step, the stirring speed is 300 rpm to 400 rpm, and the stirring temperature is room temperature.

[0033] The present invention prolongs the cold pressing curing time by improving the molecular chain length, toughening the cross-linking agent and adjusting the anti-gel inhibitor (polymer inhibitor), and adjusts the glue brushing operation time of the technicians with a stable time, thereby ultimately improving the production efficiency.

[0034] The embodiment of the present invention also discloses the use of the above-mentioned impact-resistant cold-adhesive multi-purpose polyester adhesive in electrical laminated paperboard for transformers. The polyester adhesive is used to bond paperboard or wood board by curing at room temperature and cold pressing at 1MPa~8MPa to finally form laminated paperboard or laminated wood board.

[0035] It should be noted that in the process of producing pressure-testing paperboard or wood board, the production process is similar to that of phenolic adhesive laminated paperboard, and the energy consumption cost is reduced during the pressing process; the mechanical strength including shear strength, peel strength, bending strength, etc. are better than phenolic adhesive laminated products; the dielectric properties, partial discharge, breakdown and other strength indicators are better than phenolic adhesive laminated products; the heat deformation temperature is higher than 120°C, and the laminated products can meet the E-level insulation level; the Tg transition temperature is high, it is not easy to crack after aging, and various properties can be kept unchanged under high temperature environment. The polyester adhesive of the present invention adopts a cold pressing process in the process of producing laminated products, but the board width can be increased, and the multi-layer press can increase the production volume by 5 to 10 times in one batch.

[0036] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0037] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0038] Embodiment 1: Step 1, placing 45% of unsaturated polyester resin in a stirring kettle, adding 0.5% of AMSD, 3% of cobalt naphthenate, 3% of unsaturated polyester glue suspended particle type dispersant, 2% of DAP and 22% of 300-800 mesh inorganic filler, wherein the inorganic filler is a mixture of talcum powder, dolomite powder, titanium dioxide and calcium carbonate powder in a mass ratio of 32:2:5:5; then stirring at a high speed of 1600 rpm, and stirring evenly to obtain a first prefabricated material; Step 2, dissolving 2% of tert-butyl catechol in acetone, adding 5% of DAP, 3% of a defoaming agent for unsaturated polyester, and 1% of a mixed solvent of MEKP and TBPB, and then uniformly stirring at 300 rpm to mix and obtain a second preform; Step 3, dissolving 5% of a solid toughening agent in acetone, then adding 2% of a leveling agent, and stirring to obtain a third prefabricated material; Step 4: Place the first prefabricated material, the second prefabricated material and the third prefabricated material in a stirring kettle, stir them uniformly at 300 rpm, and then put them in a sealed barrel to obtain a polyester adhesive.

[0039] Embodiment 2: Step 1, placing 60% of unsaturated polyester resin in a stirring kettle, adding 4% of AMSD, 4% of cobalt naphthenate, 4.5% of suspended particle dispersant for unsaturated polyester glue, 3% of ethylene oligomer and 28% of inorganic filler with a mesh size of 300-800, wherein the inorganic filler is a mixture of talcum powder, dolomite powder, titanium dioxide and calcium carbonate powder in a mass ratio of 24:1:4:5; then stirring at a high speed of 1400 rpm, and stirring evenly to obtain a first prefabricated material; Step 2, 0.8% of hydroquinone is dissolved in methanol and diluted, and then 7% of DAP, 1% of a defoaming agent for unsaturated polyester, and 1.4% of a mixed solvent of MEKP and TBPB are added, and then the mixture is uniformly stirred at 400 rpm to obtain a second preform; Step 3, dissolving 8% of a solid toughening agent in acetone, then adding 5% of a leveling agent, and stirring to obtain a third prefabricated material; Step 4, placing the first prefabricated material, the second prefabricated material and the third prefabricated material together in a stirring kettle, stirring them evenly at 370 rpm, and then putting them in a sealed barrel to obtain a polyester adhesive.

[0040] Embodiment 3: Step 1, placing 65% of unsaturated polyester resin in a stirring kettle, adding 3% of AMSD, 2% of cobalt naphthenate, 1% of suspended particle dispersant for unsaturated polyester glue, 4% of silicon-containing monomer and 23% of inorganic filler with a mesh size of 300-800, wherein the inorganic filler is a mixture of talcum powder, dolomite powder, titanium dioxide and calcium carbonate powder in a mass ratio of 35:2.5:7:7; then stirring at a high speed of 1800 rpm, and stirring evenly to obtain a first prefabricated material; Step 2, 4% of hydroquinone is dissolved in ethanol and diluted, and then 8% of DAP, 4% of a defoaming agent for unsaturated polyester, and 1.2% of a mixed solvent of MEKP and TBPB are added, and then the mixture is uniformly stirred at 350 rpm to obtain a second preform; Step 3, dissolving 9% of a solid toughening agent in acetone, then adding 4% of a leveling agent, and stirring to obtain a third prefabricated material; Step 4: Place the first prefabricated material, the second prefabricated material and the third prefabricated material in a stirring kettle, stir them uniformly at 330 rpm, and then put them in a sealed barrel to obtain a polyester adhesive.

[0041] Embodiment 4: Step 1, placing 55% of unsaturated polyester resin in a stirring kettle, adding 2% of AMSD, 1% of cobalt naphthenate, 2% of suspended particle dispersant for unsaturated polyester glue, 3.5% of DAP and 25% of inorganic filler with a mesh size of 300-800, wherein the inorganic filler is a mixture of talcum powder, dolomite powder, titanium dioxide and calcium carbonate powder in a mass ratio of 20:3:4:4; then stirring at a high speed of 1900 rpm, and stirring evenly to obtain a first prefabricated material; Step 2, 3% of tert-butyl catechol is dissolved in ethanol and diluted, and then 6% of DAP, 5% of a defoaming agent for unsaturated polyester, and 1.5% of a mixed solvent of MEKP and TBPB are added, and then the mixture is uniformly stirred at 380 rpm to obtain a second preform; Step 3, dissolving 4% of a solid toughening agent in ethanol, then adding 3% of a leveling agent, and stirring to obtain a third prefabricated material; Step 4: Place the first prefabricated material, the second prefabricated material and the third prefabricated material in a stirring kettle, stir them uniformly at 350 rpm, and put them in a sealed barrel to obtain a polyester adhesive.

[0042] Embodiment 5: Step 1, placing 60% of unsaturated polyester resin in a stirring kettle, adding 1.5% of AMSD, 2.5% of cobalt naphthenate, 1.5% of suspended particle dispersant for unsaturated polyester glue, 1% of DAP and 27% of inorganic filler with a mesh size of 300-800, wherein the inorganic filler is a mixture of talcum powder, dolomite powder, titanium dioxide and calcium carbonate powder in a mass ratio of 38:0.5:6:8; then stirring at a high speed of 2000 rpm, and obtaining a first prefabricated material after stirring evenly; Step 2, dissolving 2.5% of tert-butyl catechol in acetone and diluting it, adding 9% of DAP, 1% of a defoaming agent for unsaturated polyester, and 1.5% of a mixed solvent of MEKP and TBPB, and stirring the mixture uniformly at 330 rpm to obtain a second preform; Step 3, dissolving 7% of a solid toughening agent in acetone, then adding 2% of a leveling agent, and stirring to obtain a third prefabricated material; Step 4: Place the first prefabricated material, the second prefabricated material and the third prefabricated material in a stirring kettle, stir them uniformly at 400 rpm, and then put them in a sealed barrel to obtain a polyester adhesive.

[0043] Performance test of the polyester adhesive prepared in Example 1 of the present invention: The polyester adhesive prepared in Example 1 of the present invention was used to bond paperboards at room temperature and a pressure of 3 MPa to prepare a laminated paperboard. The performance of the prepared laminated paperboard was tested, and the results are shown in Table 1.

[0044] Table 1 Performance test data of polyester adhesive laminated paperboard

[0045] It can be seen from Table 1 that the laminated paperboard produced by using the polyester adhesive prepared in Example 1 of the present invention has excellent properties and meets the enterprise standards, which means that the polyester adhesive prepared in the present invention does not affect the performance of the laminated product while extending the curing time, and meets the production requirements.

[0046] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high impact resistant cold-adhesive multi-purpose polyester adhesive, characterized in that: In terms of mass percentage, its components include: 45%~65% unsaturated polyester resin, 0.2%~5% chain extender, 0.2%~5% accelerator, 1%~5% dispersant, 1%~5% organic filler, 20%~30% inorganic filler, 0.2%~5% anti-gel inhibitor, 5%~10% cross-linking agent, 1%~5% defoaming agent, 1%~1.5% curing agent, 3%~10% toughening agent and 1%~5% leveling agent.

2. A high impact resistant cold-adhesive multi-purpose polyester adhesive according to claim 1, characterized in that: The chain extender is 2,4-diphenyl-4-methyl-1-pentene; the accelerator is cobalt cyclohexaneate; and the dispersant is a suspended particle type dispersant for unsaturated polyester adhesive.

3. The high impact resistant cold-adhesive multi-purpose polyester adhesive according to claim 1, characterized in that: The anti-gel inhibitor is tert-butyl catechol or hydroquinone; the cross-linking agent is DAP; the defoaming agent is a defoaming agent for unsaturated polyester; and the curing agent is a mixture of MEKP and TBPB.

4. A method for preparing the high impact resistant cold-adhesive multi-purpose polyester adhesive according to any one of claims 1 to 3, characterized in that: The following steps are involved: Adding a chain extender, a accelerator, a dispersant, an organic filler and an inorganic filler to an unsaturated polyester resin, and stirring to obtain a first prefabricated material; Dissolving an anti-gel inhibitor in an organic solvent, adding a cross-linking agent, a defoaming agent and a curing agent, and stirring to obtain a second prefabricated material; Dissolving a solid toughening agent in an organic solvent or a liquid styrene toughening agent in a diluent, then adding a leveling agent, and stirring to obtain a third prefabricated material; The first prefabricated material, the second prefabricated material and the third prefabricated material are mixed and stirred to obtain a polyester adhesive.

5. The method for preparing an impact-resistant cold-adhesive multi-purpose polyester adhesive according to claim 4, characterized in that: The inorganic filler includes talc powder, dolomite powder, titanium dioxide and calcium carbonate powder with a mesh size of 300 to 800; the organic filler is DAP, ethylene, silicon-containing monomers or oligomers; and the organic solvent is acetone, ethanol or methanol.

6. The method for preparing an impact-resistant cold-adhesive multi-purpose polyester adhesive according to claim 5, characterized in that: The mass ratio of the talc powder, dolomite powder, titanium dioxide and calcium carbonate powder is (20-40): (0.5-3): (3-8): (3-8).

7. The method for preparing an impact-resistant cold-adhesive multi-purpose polyester adhesive according to claim 4, characterized in that: During the preparation of the first preform, the stirring speed is 1400 rpm to 2000 rpm, and the stirring temperature is room temperature.

8. The method for preparing an impact-resistant cold-adhesive multi-purpose polyester adhesive according to claim 4, characterized in that: During the preparation of the second preform, the stirring speed is 300 rpm to 400 rpm, and the stirring temperature is room temperature.

9. The method for preparing an impact-resistant cold-adhesive multi-purpose polyester adhesive according to claim 4, characterized in that: In the step of mixing the first prefabricated material, the second prefabricated material and the third prefabricated material and stirring to obtain the polyester adhesive, the stirring speed is 300 rpm to 400 rpm and the stirring temperature is room temperature.

10. Use of the impact-resistant cold-adhesive multi-purpose polyester adhesive according to any one of claims 1 to 3 in electrical laminated paperboard for transformers, characterized in that: The polyester adhesive is used to bond paperboards or wood boards by curing at room temperature and cold pressing at 1MPa-8MPa to finally form laminated paperboards or laminated wood boards.

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