Acrylate emulsion with multiple base materials and good adhesive force and preparation method thereof

Abstract

The invention provides a multi-substrate acrylate emulsion with good adhesive force and a preparation method thereof, and the raw materials for preparing the multi-substrate acrylate emulsion with good adhesive force comprise, by mass, 10-20 parts of 2-ethylhexyl acrylate, 25-35 parts of methyl methacrylate, 5-10 parts of polyethylene glycol, 1-3 parts of epoxy resin, 0.1-7 parts of an auxiliary agent, and 50-60 parts of an aqueous solvent. A paint film formed by the acrylate emulsion has good mechanical properties and excellent multi-substrate adhesion.

Description

Technical Field

[0001] The invention relates to the field of acrylic emulsions, in particular to an acrylic ester emulsion with excellent multi-substrate adhesion and a preparation method thereof. Background Art

[0002] With the vigorous development of social economy and the significant improvement of people's living standards, China's real estate industry has flourished, and the variety of coatings on the market has shown a flourishing trend. As a bridge connecting aesthetics and function, coatings not only bear the important task of protecting the substrate and extending its service life, but also play an irreplaceable role in beautifying the environment and enhancing the appearance value of products. Among them, emulsion, as one of the core components of coating formula, has a decisive influence on the comprehensive performance of coatings.

[0003] Acrylic emulsions have the advantages of low volatility, environmental friendliness, good water resistance, good stain resistance, and easy processing. However, the limitation of most acrylic emulsions is that they can only form a paint film with good adhesion performance on the surface of a substrate that is more compatible with their own type. Although this feature ensures stable performance in specific application areas, it also exposes its lack of adaptability to multiple substrates.

[0004] In view of this, there is an urgent need for in-depth research aimed at developing a new type of acrylic emulsion whose core advantage is its ability to exhibit excellent adhesion to a variety of different types of substrates. Summary of the invention

[0005] The object of the present invention is to provide an acrylic emulsion with good multi-substrate adhesion and a preparation method thereof. The paint film formed by the acrylic emulsion has good mechanical properties and excellent multi-substrate adhesion.

[0006] According to one aspect of the present invention, an acrylate emulsion with excellent adhesion to multiple substrates is provided. Calculated by weight, the raw materials for preparing the acrylate emulsion include: 10 to 20 parts of isooctyl acrylate, 25 to 35 parts of methyl methacrylate, 5 to 10 parts of polyethylene glycol, 1 to 3 parts of epoxy resin, 0.1 to 7 parts of auxiliary agent, and 50 to 60 parts of aqueous solvent.

[0007] Selecting isooctyl acrylate as a soft monomer, selecting methyl methacrylate as a hard monomer, and introducing polyethylene glycol and epoxy resin and regulating the ratio of isooctyl acrylate, methyl methacrylate, polyethylene glycol and epoxy resin, the paint film formed by the acrylic emulsion can have good mechanical properties and excellent multi-substrate adhesion. On the one hand, isooctyl acrylate, methyl methacrylate, polyethylene glycol and epoxy resin can be cross-linked and polymerized to form a polymer with a high degree of cross-linking and a high degree of freedom of chain segment movement. The cross-linked network structure formed by the polymer can be used to improve the hardness of the paint film formed by the emulsion and the ability of the paint film to resist deformation, and the paint film formed by the emulsion can be better dispersed by the movement of the chain segments in the polymer when subjected to external forces, thereby improving the flexibility of the paint film. On the other hand, epoxy resin and polyethylene glycol can produce a large number of alcohol hydroxyl groups, and these hydroxyl structures help to improve the wetting effect of the coating containing the acrylic emulsion on various substrates, effectively penetrate and fuse the oil or impurities on the surface of the substrate, and then enhance the adhesion to various substrates. At the same time, the hydroxyl structure makes it easy for the coating to penetrate into the interior of the substrate, just like a dense root system penetrating deep into the soil, deeply penetrating and reinforcing the substrate. As a result, the bonding force between the paint film and the substrate is greatly enhanced, so that the paint film can be firmly attached to the surface of a variety of substrates, including but not limited to metal (galvanized, aluminum, iron, copper), glass, concrete, wood and plastic substrates. Secondly, the use of the above materials for polymerization can also reduce the film-forming temperature of the paint film, thereby improving the film-forming efficiency.

[0008] Preferably, the raw materials for preparing the acrylic emulsion also include 1 to 4 parts of organic acid, and the molecular weight of the organic acid is not higher than 150g / mol, calculated by weight. By introducing the above-mentioned weight fraction of organic acid into the acrylic emulsion, more free radicals can be provided for the polymer formed by isooctyl acrylate, methyl methacrylate, polyethylene glycol and epoxy resin, which is conducive to further chain reaction, and because the organic acid contains a large number of hydrophilic group carboxyl groups, under the action of the carboxyl group, the organic acid can be connected to the molecular chain of the polymer, further improving the hydrophilicity of the polymer. The paint film formed by the emulsion can form hydrogen bonds with the hydroxyl groups on the surface of the substrate using the hydrophilic group carboxyl and hydroxyl groups, further improving the adhesion of the paint film to multiple substrates. In addition, the introduction of the above-mentioned weight fraction of organic acid into the acrylic emulsion can also improve the gloss fullness of the paint film.

[0009] Preferably, the organic acid includes at least one of octanoic acid, methacrylic acid and itaconic acid.

[0010] Preferably, the polyethylene glycol includes at least one of PEG800, PEG2000, PEG4000, and PEG6000. The polyethylene glycol in the acrylic ester emulsion not only participates in the polymerization reaction to form a polymer, but also undergoes a decomposition reaction to produce a large number of hydroxyl groups. The polyethylene glycol within the above molecular chain range can polymerize with isooctyl acrylate, methyl methacrylate and epoxy resin to form a polymer with a high degree of crosslinking, and can also decompose a large number of hydroxyl groups, which can greatly improve the wetting and chelating effect of the paint film on the substrate. Secondly, the use of polyethylene glycol in the above molecular weight range can also improve the solvent resistance of the emulsion.

[0011] Preferably, the epoxy resin includes at least one of Epon 828, Epikote 1001, and MY0500. Selecting the above products containing a large number of epoxy groups as epoxy resins can increase the crosslinking degree of the polymer in the emulsion, so that the emulsion can effectively protect the substrate after film formation, thereby providing excellent chemical resistance.

[0012] Preferably, the auxiliary agent includes 1 to 3 parts of reactive surfactants, calculated by weight. The introduction of the above-mentioned reactive surfactants into the acrylic emulsion can efficiently emulsify the epoxy resin and polyethylene glycol, thereby effectively inhibiting the formation of agglomerates during the polymerization process, reducing the generation of gels, and providing a stable environment for the polymerization reaction. At the same time, in the process of preparing the acrylic emulsion by polymerization, the reactive surfactant can participate in the polymerization reaction, thereby bonding to the polymer, thereby improving the substrate adhesion, water resistance and acid and alkali resistance of the paint film formed by the emulsion.

[0013] Preferably, the reactive surfactant includes at least one of SR-10, COPS-1, COPS-2, and COPS-3.

[0014] Preferably, calculated by weight, the auxiliary agent includes 0.1 to 1 part of an initiator, and the initiator includes at least one of ammonium persulfate, potassium persulfate, and sodium persulfate.

[0015] Preferably, calculated by weight, the auxiliary agent includes 1 to 3 parts of a pH regulator, and the pH regulator includes at least one of ammonia water and AMP-95.

[0016] According to another aspect of the present invention, a method for preparing the above-mentioned acrylic emulsion with good adhesion to multiple substrates is provided, comprising the following operations: S1. preparing materials: first preparing a primer liquid A, a monomer solution B and an initiator solution C, wherein the primer liquid A comprises a part of an aqueous solvent and a reactive surfactant; the monomer solution B comprises isooctyl acrylate, methyl methacrylate, polyethylene glycol, an epoxy resin and a part of an aqueous solvent, and a reactive surfactant; the initiator solution C comprises an initiator and the remaining aqueous solvent; S2. mixing: mixing the primer liquid A and a part of the monomer solution B at a reaction temperature of 82 to 85° C. In this step, the addition amount of the part of the monomer solution B is 1-10wt% of the total mass of monomer solution B; S3. Dropwise addition: at a reaction temperature of 82-85°C, initiator solution C is dripped into the reaction system after S2 is completed, 15-40 minutes after the start of dripping of initiator solution C, the remaining monomer solution B is dripped into the reaction system, the dripping time of monomer solution B is 3-5 hours, and the dripping of initiator solution C is completed 5-10 minutes after the completion of the dripping of monomer solution B; S4. Insulation: the reaction system after the dripping of initiator solution C is insulated at a temperature of 83-87 for 1-3 hours, and after post-treatment, an acrylic emulsion with excellent adhesion to multiple substrates is obtained. The invention controls the dropping order and dropping speed of different raw materials, which is beneficial to the polymerization and cross-linking between isooctyl acrylate, methyl methacrylate, polyethylene glycol and epoxy resin, and provides excellent adhesion for the paint film formed by the emulsion. The preparation method is carried out at a reaction temperature not higher than 90°C, the conditions are mild, high temperature reaction is not required, the operation is convenient, the cost is low, the conditions are mild, and good economic benefits are achieved.

[0017] Preferably, the polymerization process of S2 further includes the following operation: when the monomer solution B is added to 20-30wt% of the remaining monomer solution B, an organic acid is added to the reaction system, and the organic acid and the monomer solution B are added simultaneously. By adding the organic acid in the middle and late stages of the polymerization reaction and adjusting the dropping rate of the organic acid, a large number of hydrophilic groups are introduced into the surface layer of the emulsion, which can not only improve the gloss fullness of the paint film formed by the emulsion, thereby improving the texture of the paint film, but also improve the adhesion of the paint film to the substrate.

[0018] Preferably, the post-treatment of S3 includes the following operations: after the insulation is completed, the reaction system is cooled to 45-50° C., and a pH regulator is added to the reaction system to adjust the pH of the reaction system to 7-9. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0020] Example 1

[0021] This embodiment provides an acrylic emulsion with good adhesion to multiple substrates, and the acrylic emulsion with good adhesion to multiple substrates is composed of the following components:

[0022] Table 1. Raw material composition of acrylic emulsion with good adhesion to multiple substrates in Example 1

[0023]

[0024]

[0025] Among them, the molecular weight of octanoic acid is 144.2 g / mol.

[0026] The method for preparing the acrylic emulsion with good multi-substrate adhesion comprises the following steps:

[0027] S1. Prepare materials: first prepare a primer solution A, a monomer solution B and an initiator solution C, wherein the primer solution A comprises 12 parts of an aqueous solvent and 0.5 parts of a reactive surfactant; the monomer solution B comprises isooctyl acrylate, methyl methacrylate, polyethylene glycol, an epoxy resin and 5 parts of an aqueous solvent, and 1 part of a reactive surfactant in the amount shown in Table 1; the initiator solution C comprises 0.2 parts of an initiator and 38 parts of an aqueous solvent;

[0028] S2 mixing: at a reaction temperature of 82 ° C, the primer solution A and part of the monomer solution B are mixed and stirred. In this step, part of the monomer solution B is added in an amount of 1.8wt% of the total mass of the monomer solution B;

[0029] S3. Dropwise addition: at a reaction temperature of 82-85°C, initiator solution C is dropwise added to the reaction system after completion of S2. 15 minutes after the dropwise addition of initiator solution C, the remaining monomer solution B is dropwise added to the reaction system. The dropwise addition time of monomer solution B is 3.5 hours. Moreover, when monomer solution B is added to 25 wt% of the remaining monomer solution B, an organic acid is dropwise added to the reaction system. The organic acid and monomer solution B are added dropwise at the same time. The dropwise addition of initiator solution C is completed 5 minutes after the addition of monomer solution B is completed.

[0030] S4. Insulation: After the initiator solution C is added, the reaction system is insulated at 85°C for 1.5 hours. After the insulation, the reaction system is cooled to 45-50°C, and a pH adjuster is added to the reaction system to adjust the pH of the reaction system to 7.5. The reaction system is stirred for 20 minutes, and the material is filtered to obtain an acrylic emulsion with excellent adhesion to multiple substrates.

[0031] In other embodiments, the type and amount of the organic acid, reactive surfactant, initiator, pH adjuster or aqueous solvent may be adjusted according to actual conditions, provided that the normal preparation of the coating is not affected.

[0032] Example 2

[0033] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that the feeding amount of each raw material composition in the polymerization monomer is adjusted, specifically: 10 parts of isooctyl acrylate, 25 parts of methyl methacrylate, 5 parts of polyethylene glycol, and 1 part of epoxy resin. The remaining raw material ratios and preparation methods are strictly consistent with Example 1.

[0034] Example 3

[0035] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that the feeding amount of each raw material composition in the polymerization monomer is adjusted, specifically: 20 parts of isooctyl acrylate, 35 parts of methyl methacrylate, 10 parts of polyethylene glycol, and 3 parts of epoxy resin. The remaining raw material ratios and preparation methods are strictly consistent with Example 1.

[0036] Example 4

[0037] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that an equal amount of linolenic acid is used to replace the organic acid in Example 1, wherein the molecular weight of linolenic acid is 278.4 g / mol. The rest of the raw material ratios and preparation methods are strictly consistent with those in Example 1.

[0038] Example 5

[0039] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that an equal mass of methacrylic acid is used to replace the organic acid in Example 1, wherein the molecular weight of methacrylic acid is 86.09 g / mol. The rest of the raw material ratios and preparation methods are strictly consistent with those in Example 1.

[0040] Example 6

[0041] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that an equal mass of Epikote 1001 is used to replace the epoxy resin in Example 1. The rest of the raw material ratios and preparation methods are strictly consistent with those in Example 1.

[0042] Example 7

[0043] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that MY0500 of equal mass is used to replace the epoxy resin in Example 1. The rest of the raw material ratios and preparation methods are strictly consistent with those in Example 1.

[0044] Example 8

[0045] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that an equal mass of E-20 is used to replace the epoxy resin in Example 1. The rest of the raw material ratios and preparation methods are strictly consistent with those in Example 1.

[0046] Example 9

[0047] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that an equal mass of sodium dodecyl sulfate is used to replace the reactive surfactant in Example 1. The rest of the raw material ratios and preparation methods are strictly consistent with those in Example 1.

[0048] Example 10

[0049] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that in the process of S2 of preparing the acrylic emulsion, the dripping speed of the initiator solution C is adjusted so that the initiator solution C and the monomer solution B are dripped at the same time. The rest of the raw material ratios and preparation methods are strictly consistent with those in Example 1.

[0050] Embodiment 11

[0051] This embodiment refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this embodiment and Example 1 is that in the process of preparing the acrylic emulsion S2, the timing of adding the organic acid is adjusted, specifically, when the monomer solution B is added to 50wt% of the remaining monomer solution B, the organic acid is added to the reaction system. The rest of the raw material ratios and preparation methods are strictly consistent with those in Example 1.

[0052] Example 12

[0053] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that in the process of preparing the acrylic emulsion S2, the timing of adding the organic acid is adjusted, specifically, when the monomer solution B is added to 10wt% of the remaining monomer solution B, the organic acid is added to the reaction system. The rest of the raw material ratios and preparation methods are strictly consistent with those in Example 1.

[0054] Comparative Example 1

[0055] This comparative example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion. The difference between this comparative example and Example 1 is that the feeding amount of epoxy resin is adjusted to 0.5 parts. The other raw material ratios and preparation methods are strictly consistent with Example 1.

[0056] Comparative Example 2

[0057] This comparative example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion. The difference between this comparative example and Example 1 is that the feeding amount of epoxy resin is adjusted to 3.5 parts. The other raw material ratios and preparation methods are strictly consistent with Example 1.

[0058] Comparative Example 3

[0059] This comparative example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion. The difference between this comparative example and Example 1 is that the feeding amount of polyethylene glycol is adjusted to 2.5 parts. The other raw material ratios and preparation methods are strictly consistent with Example 1.

[0060] Comparative Example 4

[0061] This comparative example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion. The difference between this comparative example and Example 1 is that the feeding amount of polyethylene glycol is adjusted to 12.5 parts. The other raw material ratios and preparation methods are strictly consistent with Example 1.

[0062] Comparative Example 5

[0063] This comparative example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion. The difference between this comparative example and Example 1 is that the feed amount of isooctyl acrylate is adjusted to 28 parts, and the feed amount of methyl methacrylate is adjusted to 7 parts. The rest of the raw material ratios and preparation methods are strictly consistent with Example 1.

[0064] Comparative Example 6

[0065] This example refers to the preparation method provided in Example 1 to prepare an acrylic emulsion with good adhesion to multiple substrates. The difference between this example and Example 1 is that the feeding amount of isooctyl acrylate is adjusted to 5 parts, and the feeding amount of methyl methacrylate is adjusted to 38 parts. The rest of the raw material ratios and preparation methods are strictly consistent with Example 1.

[0066] Test Example 1

[0067] Test objects: According to actual needs, the acrylic emulsions with good multi-substrate adhesion provided by Examples 1 to 13 and the acrylic emulsions provided by Comparative Examples 1 to 6 are respectively formulated into coatings. Except for the different emulsions, the other raw material ratios and preparation methods of the above coatings are strictly kept consistent. The prepared coatings are used as parameter objects for the following test items.

[0068] Test items and test methods:

[0069] (1) Hardness: Refer to the test method in GB / T 6739-2022 Paints and varnishes - Determination of paint film hardness by pencil method, and record the pencil hardness of the paint film formed by the test object.

[0070] (2) Adhesion: Refer to the test method in GB / T 9286-1998 Paint and varnish cross-cut test and record the adhesion level of the paint film formed by the test object to various substrates.

[0071] Table 2. Performance test results of this test case

[0072]

[0073]

[0074] Result analysis:

[0075] From the test performance shown in Table 2, compared with the emulsions provided in Comparative Examples 1 to 6, the paint films formed by the emulsions provided in Examples 1 to 13 exhibit better mechanical properties and multi-substrate adhesion.

[0076] By comparing the performance of the emulsions provided in Examples 1 to 3 and Comparative Examples 1 to 4 in Table 2, it can be found that as the amount of epoxy resin or polyethylene glycol added to the raw materials of the acrylate emulsion increases, the surface hardness of the paint film formed by the acrylate emulsion and the adhesion to metal, glass, plastic and other substrates show a trend of first increasing and then decreasing, wherein the mechanical properties and multi-substrate adhesion of the paint film formed by the emulsions of Examples 1 to 3 are better than those of the paint film formed by Comparative Examples 1 to 4. This shows that when the raw materials of the acrylate emulsion with good multi-substrate adhesion include 1 to 3 parts of epoxy resin and 5 to 10 parts of polyethylene glycol, the acrylate emulsion has good surface hardness and excellent multi-substrate adhesion.

[0077] Comparing the performance of the emulsions provided in Examples 1 to 3 with those provided in Comparative Examples 5 to 6 in Table 2, it can be found that the paint films formed by the emulsions of Examples 1 to 3 have higher pencil hardness and better adhesion to substrates such as metal, glass, and plastic materials than the paint films provided in Comparative Examples 5 to 6. This shows that when the raw materials for preparing the acrylic emulsion include 10 to 20 parts of isooctyl acrylate and 25 to 35 parts of methyl methacrylate, the acrylic emulsion has good surface hardness and excellent adhesion to multiple substrates.

[0078] By comparing the performance of Example 1 with that of Examples 4 to 5 in Table 2, it can be found that compared with the paint film using the emulsion of Example 4, the paint films provided by Examples 1 and 5 have higher adhesion levels to various substrates. This shows that when an organic acid with a molecular weight of no more than 150 g / mol is introduced into the raw materials of the acrylic emulsion, the hydrophilicity of the paint film formed by the emulsion can be effectively improved, thereby improving the adhesion of the paint film to multiple substrates.

[0079] Comparing the test results of the paint films provided in Example 1 and Examples 6 to 8, it can be found that the paint films provided in Example 1 and Examples 6 to 8 have good surface hardness and good adhesion to various substrates. Among them, compared with the paint film provided in Example 8, the paint films provided in Example 1 and Examples 6 to 7 have better mechanical properties and adhesion levels, which can be explained that when the epoxy resin includes at least one of Epon 828, Epikote 1001, and MY0500, the crosslinking degree of the polymer in the emulsion can be further improved, so that the emulsion can be more effectively attached to the surface of the substrate after forming the paint film, thereby protecting the substrate.

[0080] By comparing the performance of Example 1 and Example 9 in Table 2, it can be found that the paint film provided by Example 1 has better adhesion to various substrates than the paint film provided by Example 9. This shows that, compared with anionic surfactants such as sodium dodecyl sulfate, reactive surfactants can participate in the polymerization reaction and thus bond to the polymer, thereby improving the substrate adhesion of the paint film.

[0081] By comparing the test results of the paint film provided in Example 1 with that provided in Example 10, it can be found that by adjusting the dripping speed of the monomer solution B so that the monomer solution B is dripped before the initiator C, it can effectively promote the participation of various monomers in the monomer solution B in the polymerization reaction, improve the degree of reaction, and thus improve the comprehensive performance of the paint film formed by the emulsion. Specifically, the mechanical properties and adhesion of the paint film provided in Example 1 are better than those of the paint film provided in Example 10. By comparing the test results of the paint film provided in Example 1 with those provided in Examples 11 to 12, it can be found that the mechanical properties and substrate adhesion of the paint film provided in Example 1 are better than those of the paint films provided in Examples 11 and 12. In addition, it was also found during the experiment that the surface gloss of the paint film provided in Example 1 is better than that of the paint films provided in Examples 11 and 12. This shows that by adjusting the dripping time of the organic acid, a large number of hydrophilic groups can be introduced into the surface layer of the emulsion, which can not only achieve the effect of improving the gloss fullness of the paint film formed by the emulsion, so as to improve the texture of the paint film, but also improve the adhesion of the paint film to the substrate.

[0082] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. An acrylic emulsion with good adhesion to multiple substrates, characterized in that: Calculated by weight, the raw materials for preparing the acrylic emulsion include: 10-20 parts of isooctyl acrylate, 25-35 parts of methyl methacrylate, 5-10 parts of polyethylene glycol, 1-3 parts of epoxy resin, 0.1-7 parts of auxiliary agent, and 50-60 parts of aqueous solvent.

2. The acrylic emulsion with good adhesion to multiple substrates as claimed in claim 1, characterized in that: Calculated by weight, the raw materials for preparing the acrylic emulsion also include 1 to 4 parts of an organic acid, and the molecular weight of the organic acid is not higher than 150 g / mol.

3. The acrylic emulsion with good multi-substrate adhesion as claimed in claim 2, characterized in that: The organic acid includes at least one of octanoic acid, methacrylic acid and itaconic acid.

4. The acrylic emulsion with good adhesion to multiple substrates as claimed in claim 1, characterized in that: The polyethylene glycol includes at least one of PEG800, PEG2000, PEG4000 and PEG6000.

5. The acrylic emulsion with good adhesion to multiple substrates as claimed in claim 1, characterized in that: The epoxy resin includes at least one of Epon 828, Epikote 1001, and MY0500.

6. The acrylic emulsion with good multi-substrate adhesion as claimed in claim 1, characterized in that: Calculated by weight, the auxiliary agent includes 1 to 3 parts of a reactive surfactant.

7. The acrylic emulsion with good multi-substrate adhesion as claimed in claim 1, characterized in that: Calculated by weight, the auxiliary agent includes 0.1 to 1 part of an initiator, and the initiator includes at least one of ammonium persulfate, potassium persulfate, and sodium persulfate.

8. The acrylic emulsion with good adhesion to multiple substrates as claimed in claim 1, characterized in that: Calculated by weight, the auxiliary agent includes 1 to 3 parts of a pH regulator, and the pH regulator includes at least one of ammonia water and AMP-95.

9. A method for preparing the acrylic emulsion with good multi-substrate adhesion as claimed in any one of claims 1 to 8, characterized in that: The following operations are included: S1. Prepare materials: first prepare a primer solution A, a monomer solution B and an initiator solution C, wherein the primer solution A comprises a portion of the aqueous solvent and a reactive surfactant; the monomer solution B comprises isooctyl acrylate, methyl methacrylate, polyethylene glycol, the epoxy resin and a portion of the aqueous solvent and a reactive surfactant; the initiator solution C comprises an initiator and the remaining aqueous solvent; S2. Mixing: At a reaction temperature of 82 to 85°C, mixing the primer solution A with a portion of the monomer solution B. In this step, the amount of the monomer solution B added is 1 to 10 wt% of the total mass of the monomer solution B; S3. Dropwise addition: at a reaction temperature of 82 to 85° C., the initiator solution C is added dropwise to the reaction system after the completion of S2, and 15 to 40 minutes after the start of the dropwise addition of the initiator solution C, the remaining monomer solution B is added dropwise to the reaction system, the dropwise addition time of the monomer solution B is 3 to 5 hours, and the dropwise addition of the initiator solution C is completed 5 to 10 minutes after the dropwise addition of the monomer solution B is completed; S4. Insulation: The reaction system after the initiator solution C is added is insulated at a temperature of 83 to 87° C. for 1 to 3 hours. After post-treatment, the acrylic emulsion with good adhesion to multiple substrates is obtained.

10. The method for preparing an acrylic emulsion with good adhesion to multiple substrates as claimed in claim 9, characterized in that: The S2 aggregation process also includes the following operations: When 20-30 wt % of the total weight of the monomer solution B remains unadded, an organic acid is added dropwise to the reaction system, and the organic acid and the monomer solution B are added dropwise simultaneously.

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