Self-adhesive coating for silicon steel and amorphous alloy and preparation method of self-adhesive coating

Abstract

The invention provides a self-adhesive coating for silicon steel and amorphous alloy and a preparation method of the self-adhesive coating. The self-adhesive coating comprises the following components in parts by mass: 20-60 parts of epoxy resin, 10-20 parts of modified organic silicon resin, 1-5 parts of hyperbranched epoxy resin, 1-10 parts of a curing agent, 1-5 parts of aminosilane hydrolysate, 1-3 parts of a dispersing agent, 1-10 parts of rock wool fiber powder, 2.5-8 parts of an auxiliary agent and 40-80 parts of a solvent. Wherein the modified organic silicon resin is obtained by reacting octa-amino POSS (Polyhedral Oligomeric Silsesquioxane), trimethylolpropane triglycidyl ether and amino silicon oil. The compatibility among the components is optimized, the self-bonding effect of the product is greatly improved, the stability and weather resistance of the coating are also improved, the defects in the prior art are overcome, and good application prospects are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and particularly to a self-adhesive coating for silicon steel and amorphous alloys and a preparation method thereof. Background Art

[0002] Silicon steel (electrical steel) and non-metal alloys are important magnetic materials, which are widely used in the field of power electronics due to their electromagnetic properties and are applied to motor products. After magnetic material thin strips are stacked, they are connected together in different ways to form a core body, such as bolt connection, welding, riveting, etc. However, such "point-to-point" connection methods have problems such as affecting the magnetic properties of the core body, insufficient connection strength, and possible resonance. Using a self-adhesive coating to connect the thin strips can achieve a firm combination between the surfaces of the thin strips, avoid mechanical damage, reduce magnetic property loss, and also endow the material with better insulation and corrosion resistance. Therefore, it has been increasingly used.

[0003] Existing technologies such as CN105131750A - An environment-friendly self-adhesive coating for electrical steel and its preparation method, CN110317532A - A water-soluble environment-friendly self-adhesive insulating coating for silicon steel, CN118772738A - A self-adhesive coating for amorphous silicon steel sheets and its preparation method, etc. have all proposed technical solutions for preparing self-adhesive coatings by compounding components such as epoxy resin and inorganic fillers, achieving functions such as good stability, processability, and water resistance.

[0004] However, in the application of existing self-adhesive coating products, there are still some problems. For example, the bonding effect of conventional epoxy resin is not ideal enough, and the compatibility between inorganic fillers and organic resins is poor. These defects reduce various properties of the coating such as uniformity, film-forming property, heat resistance, and mechanical strength, and also have an adverse effect on the bonding between thin strips, unable to meet the performance requirements of motor cores under high working conditions in related fields.

[0005] Therefore, how to optimize and improve the compatibility between different components, achieve a better self-bonding effect, and at the same time enhance the stability and durability of the coating is the current research focus in this field.

[0006] In summary, it is urgent to develop a new technical solution to solve the deficiencies existing in the prior art. Summary of the Invention

[0007] The self-adhesive coating for silicon steel and amorphous alloys provided by the present invention is prepared by compounding components such as epoxy resin, modified silicone resin, rock wool fiber powder, hyperbranched epoxy resin, and additives. It optimizes the compatibility between various components, greatly improves the self-bonding effect of the product, and also enhances the compressive stability and heat resistance of the coating, overcoming the deficiencies existing in the prior art and having good application prospects.

[0008] An object of the present invention is to provide a self - adhesive coating for silicon steel and amorphous alloys, and the self - adhesive coating for silicon steel and amorphous alloys comprises components in the following parts by mass:

[0009]

[0010] Among them,

[0011] The modified silicone resin is obtained by reacting octa - amino POSS, trimethylolpropane triglycidyl ether and amino silicone oil.

[0012] Furthermore, the preparation method of the modified silicone resin comprises the following steps:

[0013] S1. Mix octa - amino POSS and trimethylolpropane triglycidyl ether, and after heating and reacting, an intermediate product is obtained;

[0014] S2. Mix the intermediate product and amino silicone oil, and after heating and reacting, a modified silicone resin is obtained.

[0015] Furthermore, the temperature of the heating reaction is 50 - 90 °C.

[0016] Furthermore, the mass ratio of octa - amino POSS to amino silicone oil is 1:(2 - 6).

[0017] Furthermore, the rock wool fiber powder is fiber powder with a fiber length ≤ 10 μm obtained by crushing rock wool materials.

[0018] Furthermore, the auxiliary agent is selected from one or more of toughening agents, emulsifiers, defoaming agents, leveling agents, thickening agents, cosolvents, accelerators and film - forming aids.

[0019] Furthermore, the epoxy resin is selected from one or more of bisphenol A epoxy resin and o - cresol novolac epoxy resin.

[0020] Furthermore, the hyperbranched epoxy resin is HyPer E102.

[0021] Furthermore, the hydrolyzed solution of amino silane is JH - AP10.

[0022] Another object of the present invention is to provide a preparation method of the above - mentioned self - adhesive coating for silicon steel and amorphous alloys, and the preparation method of the self - adhesive coating for silicon steel and amorphous alloys comprises the following steps:

[0023] L1. Mix the solvent, the hydrolyzed solution of amino silane and the rock wool fiber powder, and heat and stir;

[0024] L2. Add epoxy resin, modified silicone resin, hyperbranched epoxy resin, and dispersant, and stir evenly;

[0025] L3. Add the remaining components, and discharge to obtain the self - adhesive coating for silicon steel and amorphous alloy.

[0026] Furthermore, the temperature of the heating and stirring is 60 - 90 °C.

[0027] The present invention has the following beneficial effects:

[0028] (1) The self - adhesive coating for silicon steel and amorphous alloy of the present invention is obtained by compounding components such as epoxy resin, modified silicone resin, hyperbranched epoxy resin, and amino - silane hydrolyzate. Among them, the modified silicone resin is: using octa - amino POSS as the core, reacting with multifunctional trimethylolpropane triglycidyl ether as the cross - linker, and then further reacting with amino silicone oil. The resulting product has a branched network structure. The POSS (cage - type polyhedral oligomeric silsesquioxane) in it can play a toughening role, improve the mechanical properties of the product, and is also beneficial to enhancing the thermal stability. The introduced polysiloxane chain segments also help to improve many properties such as the film - forming property and water resistance of the coating. A large number of amino groups in its structure can also promote the adhesion effect with the silicon steel or amorphous alloy substrate.

[0029] (2) The present invention uses the amino - silane hydrolyzate JH - AP10 to react with rock wool fiber powder to carry out organic modification on the surface of the rock wool fiber powder. It not only improves the compatibility between the rock wool fiber powder and the resin, improves the uniformity of the composition, but also the coupling agent after forming the oligomer can increase the functional group density and promote the cross - linking process with the epoxy resin, thereby enhancing the performance of the coating.

[0030] (3) The present invention also uses hyperbranched epoxy resin HyPer E102 as a component. This component not only enhances the bonding performance of the coating by introducing more active functional groups, but also can further cross - link with the active groups such as epoxy groups and hydroxyl groups in the modified silicone resin, amino - silane hydrolyzate JH - AP10, and epoxy resin. Multiple components form a three - dimensional network structure, thereby synergistically enhancing the peel strength, toughness, and stability of the self - adhesive coating, ensuring stable and firm connection between thin - strip substrates, and meeting the performance requirements of the industry for self - adhesive coatings. Specific Embodiments

[0031] To more clearly illustrate the technical solutions of the present invention, the following examples are listed. The raw materials, reactions, and post - treatment means in the examples are all common raw materials on the market and technical means well - known to those skilled in the art, unless otherwise specified.

[0032] The words "preferred", "preferably", "more preferably", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the description of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention.

[0033] It should be understood that, except in any operating examples, or where otherwise indicated, all numbers indicating, for example, the amounts of ingredients used in the specification and claims should be understood to be modified in all cases by the term "about". Therefore, unless indicated to the contrary, the numerical parameters set forth in the following specification and the appended claims are approximate values ​​that vary depending on the desired properties to be obtained by the present invention.

[0034] The epoxy resin in the embodiment of the present invention is E12 bisphenol A epoxy resin and NPCN-704 o-cresol epoxy resin in a mass ratio of 4:1.

[0035] The hyperbranched epoxy resin HyPer E102 in the embodiment of the present invention was purchased from Wuhan Hyperbranched Resin Technology Co., Ltd.

[0036] The rock wool fiber powder in the embodiment of the present invention has a fiber length of ≤10 μm.

[0037] The curing agent in the embodiment of the present invention is dicyandiamide; the aminosilane hydrolyzate is JH-AP10; the dispersant is BYK-190; the auxiliary agent is the defoamer BYK-A530, the cosolvent tripropylene glycol butyl ether, and the accelerator N-(2-hydroxy-4-nitrobenzene)-N',N'-dimethylurea in a mass ratio of 1:2.5:0.5; and the solvent is deionized water.

[0038] Octaamino POSS in the examples of the present invention was purchased from Xi'an Qiyue Biological, CAS No. 150380-11-3.

[0039] The amino silicone oil in the embodiment of the present invention is Dow Corning OFX-8040A.

[0040] The preparation method of the modified silicone resin in the embodiment of the present invention comprises the following steps:

[0041] S1, mixing octaamino POSS and trimethylolpropane triglycidyl ether in a molar ratio of 1:8, reacting at 70° C. for 3 h to obtain an intermediate product;

[0042] S2. Mix the intermediate product and amino silicone oil (octaamino POSS: amino silicone oil = 1:4, m / m), and react at 70° C. for 4 h to obtain a modified silicone resin.

[0043] In the embodiments of the present invention, "parts" all refer to parts by mass.

[0044] Example 1

[0045] A self - adhesive coating for silicon steel and amorphous alloy, the self - adhesive coating for silicon steel and amorphous alloy comprises the following components in parts by mass:

[0046]

[0047] The preparation method of the self - adhesive coating for silicon steel and amorphous alloy comprises the following steps:

[0048] L1. According to the above parts by mass, mix the solvent, amino - silane hydrolyzate and rock wool fiber powder, and stir at 70 °C for 2 h;

[0049] L2. After cooling, add epoxy resin, modified silicone resin, hyperbranched epoxy resin and dispersant, and stir evenly;

[0050] L3. Add the remaining components, stir evenly, and discharge to obtain the self - adhesive coating for silicon steel and amorphous alloy.

[0051] Example 2

[0052] A self - adhesive coating for silicon steel and amorphous alloy, the self - adhesive coating for silicon steel and amorphous alloy comprises the following components in parts by mass:

[0053]

[0054] The preparation method of the self - adhesive coating for silicon steel and amorphous alloy comprises the following steps:

[0055] L1. According to the above parts by mass, mix the solvent, amino - silane hydrolyzate and rock wool fiber powder, and stir at 70 °C for 2 h;

[0056] L2. After cooling, add epoxy resin, modified silicone resin, hyperbranched epoxy resin and dispersant, and stir evenly;

[0057] L3. Add the remaining components, stir evenly, and discharge to obtain the self - adhesive coating for silicon steel and amorphous alloy.

[0058] Example 3

[0059] A self - adhesive coating for silicon steel and amorphous alloy, the self - adhesive coating for silicon steel and amorphous alloy comprises the following components in parts by mass:

[0060]

[0061] The preparation method of the self - adhesive coating for silicon steel and amorphous alloy comprises the following steps:

[0062] L1. Mix the solvent, the hydrolyzed solution of amino silane, and the rock wool fiber powder according to the above parts by mass, and stir at 70 °C for 2 h;

[0063] L2. After cooling, add epoxy resin, modified silicone resin, hyperbranched epoxy resin, and dispersant, and stir evenly;

[0064] L3. Add the remaining components, stir evenly, and discharge to obtain the self-adhesive coating for silicon steel and amorphous alloy.

[0065] Comparative Example 1

[0066] A self-adhesive coating for silicon steel and amorphous alloy. The difference between this comparative example and Example 1 is that the modified silicone resin is replaced by a physical mixture of octaamino POSS and amino silicone oil with a mass ratio of 1:4, and the other components and preparation methods are the same as those in Example 1.

[0067] Comparative Example 2

[0068] A self-adhesive coating for silicon steel and amorphous alloy. The difference between this comparative example and Example 1 is that the hydrolyzed solution of amino silane JH-AP10 is replaced by KH-560, and the hyperbranched epoxy resin HyPer E102 is replaced by E44 bisphenol A epoxy resin, and the other components and preparation methods are the same as those in Example 1.

[0069] Test Example

[0070] Using silicon steel strip as the substrate, perform performance tests on the self-adhesive coating samples prepared in the examples and comparative examples.

[0071] Test method:

[0072] Test the peel strength, adhesion, and toughness according to the standards of GB / T 2791-1995, GB / T 9286-1998, and GB / T 1731-1993 (bending on a 15-mm-diameter shaft).

[0073] The test results are shown in Table 1.

[0074] Table 1 Performance test results of the samples of Examples 1-3 and Comparative Examples 1-2

[0075] Test items Peeling strength (N / mm) Adhesion Toughness Example 1 13.4 Grade 0 No cracking or peeling Example 2 13.7 Grade 0 No cracking or peeling Example 3 12.8 Grade 0 No cracking or peeling Comparative example 1 9.8 Grade 1 Cracking occurred Comparative example 2 10.3 Grade 1 Cracking occurred

[0076] Based on the above experimental data, it can be concluded that the self-bonding coating prepared in the embodiments of the present invention for silicon steel and amorphous alloys has excellent comprehensive properties, strong adhesion, large peel strength, and good toughness. However, it is difficult for the components of Comparative Examples 1-2, which replace the modified silicone resin, amino silane hydrolyzate, and hyperbranched epoxy resin, to form an ideal synergistic effect, and the bondability, adhesion, and toughness are significantly reduced. In summary, the present invention solves the problems and defects existing in the prior art and is of great significance to the development and progress of preparing motor cores from silicon steel strips and amorphous alloy strips.

[0077] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention.

[0078] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A self - adhesive coating for silicon steel and amorphous alloys, characterized in that, The self - adhesive coating for silicon steel and amorphous alloy comprises the following components in parts by mass: Among them, The modified silicone resin is obtained by the reaction of octa - amino POSS, trimethylolpropane triglycidyl ether and amino silicone oil.

2. The self - adhesive coating for silicon steel and amorphous alloy according to claim 1, characterized in that, The preparation method of the modified silicone resin comprises the following steps: S1. Mix octa - amino POSS and trimethylolpropane triglycidyl ether, and obtain an intermediate product after heating and reacting; S2. Mix the intermediate product and amino silicone oil, and obtain the modified silicone resin after heating and reacting.

3. The self-bonding coating for silicon steel and amorphous alloy according to claim 2, characterized in that, The temperature of the heating reaction is 50 - 90 °C.

4. The self - adhesive coating for silicon steel and amorphous alloy according to claim 2, characterized in that, The mass ratio of octa - amino POSS to amino silicone oil is 1:(2 - 6).

5. The self-bonding coating for silicon steel and amorphous alloy according to claim 1, characterized in that, The rock wool fiber powder is a fiber powder with a fiber length ≤ 10 μm obtained by crushing rock wool materials.

6. The self - adhesive coating for silicon steel and amorphous alloy according to claim 1, characterized in that, The auxiliary agent is selected from one or more of toughening agents, emulsifiers, defoaming agents, leveling agents, thickening agents, cosolvents, accelerators and film - forming aids.

7. The self-bonding coating for silicon steel and amorphous alloy according to claim 1, characterized in that, The epoxy resin is selected from one or more of bisphenol A epoxy resin and o - cresol novolac epoxy resin.

8. The self-bonding coating for silicon steel and amorphous alloy according to claim 1, characterized in that, The hyperbranched epoxy resin is HyPer E102.

9. The self - adhesive coating for silicon steel and amorphous alloy according to claim 1, wherein, The amino - silane hydrolysis solution is JH - AP10.

10. The preparation method of the self-adhesive coating for silicon steel and amorphous alloy according to any one of claims 1-9, characterized in that, The preparation method of the self - adhesive coating for silicon steel and amorphous alloy comprises the following steps: L1. Mix the solvent, amino - silane hydrolysis solution and rock wool fiber powder, and heat and stir; L2. Add epoxy resin, modified silicone resin, hyperbranched epoxy resin, and dispersant, and stir evenly; L3. Add the remaining components, and discharge to obtain the self - adhesive coating for silicon steel and amorphous alloy.

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