Impregnation liquid for inductor and preparation process

Abstract

The invention discloses an impregnation liquid for an inductor and a preparation process and application thereof, and belongs to the field of composite materials and passive electronic components. The preparation method comprises the following steps: dissolving 100 phr by mass of acrylic resin, 1-2 phr by mass of a coupling agent, 10-20 phr by mass of a reactive diluent and 1-3 phr by mass of a curing agent into a liquid mixture, and selecting 30-40 phr by mass of titanium dioxide powder with the particle size of 2-20 nm as an inorganic filler, then the organic matter solution and titanium dioxide powder are fully stirred and mixed, and the inductance impregnation liquid with different temperature resistance, aging resistance and precision degrees is obtained by regulating and controlling the content of the organic matter and the content of the titanium dioxide powder.

Description

TECHNICAL FIELD

[0001] The present application relates to an impregnation solution for inductors and a preparation process, and mainly solves the strength and corrosion resistance of inductors, and belongs to the field of composite materials and passive electronic components. BACKGROUND

[0002] In the process of manufacturing inductors, a large number of micropore defects are inevitably formed due to gas residues, adhesive shrinkage, powder gaps, etc. The strength deterioration and easy corrosion caused by these pores will bring reliability risks to the use of inductors and shorten the service life. In view of the above problems, various surface treatment technologies have been developed, such as electroplating, painting, chemical plating, vapor deposition, impregnation, etc. Considering production efficiency, cost, process complexity, environmental protection, use effect and other factors, the present application uses an impregnation solution to impregnate the inductor, fills the micropores through the impregnation solution to improve the strength of the product, reduces the permeability of external acid, alkali, salt and water, etc., thereby improving the performance, reliability and prolonging the service life of the inductor. According to the relevant information at home and abroad, the main types of impregnation solutions and their advantages and disadvantages are as follows: 1) Inorganic impregnation solution: Advantages: simple operation, high-temperature resistant and aging-resistant solidified product.

[0003] Disadvantages: brittle solidified product, easy to peel off and cause failure.

[0004] 2) Organic impregnation solution: Advantages: high product pass rate, solidified product with strength and toughness.

[0005] Disadvantages: high process difficulty and poor temperature resistance.

[0006] By comparing the advantages and disadvantages of inorganic and organic impregnation solutions, it is found that single organic or inorganic impregnation solution cannot achieve the optimal impregnation performance. Therefore, the present application creatively prepares an inorganic-organic composite impregnation solution, which combines the high-temperature resistance and aging resistance of inorganic impregnation solution and the high product pass rate, solidified product with strength and toughness of organic impregnation solution. SUMMARY

[0007] The present application aims to provide an inorganic-organic composite impregnation solution with high-temperature resistance, aging resistance, high production pass rate, and solidified product with strength and toughness. At the same time, by improving the processing technology, the cost and process complexity are reduced.

[0008] In order to achieve the above-mentioned purpose, the technical scheme of the present application is to dissolve acrylic resin (100 phr), coupling agent (1-2 phr), active diluent (10-20 phr) and curing agent (1-3 phr) into a liquid mixture, and to select titanium dioxide powder (30-40 phr) with a particle size of 2-20 nm as inorganic filler, and then to fully stir and mix the above-mentioned organic solution and titanium dioxide powder, so that the inductance impregnation solution with different temperature resistance, aging resistance and precision can be obtained by adjusting the content of the organic matter and the content of the titanium dioxide powder.

[0009] The present application provides an inductance impregnation solution prepared from the following substances with the mass fraction: 100 phr of acrylic resin, 1-2 phr of coupling agent, 10-20 phr of active diluent, 1-3 phr of curing agent and 30-40 phr of titanium dioxide powder with a particle size of 2-20 nm.

[0010] The acrylic resin is, for example, all-propylene resin, silicon-propylene resin, benzene-propylene resin, etc. The coupling agent is, for example, silane coupling agent, aluminate coupling agent and phthalate coupling agent, etc. The active diluent is, for example, polyethylene glycol glycidyl ether, allyl glycidyl ether, phenyl glycidyl ether, etc. The curing agent is, for example, isocyanate, pyridine, amino resin, etc.

[0011] The preparation method of the inductance impregnation solution comprises the following steps: a. Put titanium dioxide powder into a barrel; b. Introduce a dispersion solution into the barrel, and then start stirring at a speed of 300-500 r / min; the dispersion solution in step b is one or more of ethanol, methanol, acetone or butanone.

[0012] c. Slowly pour the coupling agent into the titanium dioxide powder solution, and continue stirring; d. After the treated titanium dioxide powder is baked at 60 ℃ for 1 h, it is taken out for standby; e. Add acrylic resin into another container, and then add the treated titanium dioxide powder, curing agent and active diluent in step b, and stir the mixture uniformly for 1 h at a speed of 400 r / min to obtain the impregnation solution.

[0013] The application of the inductance impregnation solution is for the impregnation of inductance.

[0014] The present application has the following advantages: 1. The titanium dioxide powder is pretreated with a coupling agent, which wraps a layer of coupling agent molecules on the surface of the titanium dioxide powder, thereby increasing the interaction between the titanium dioxide powder and organic molecules, improving the weak bonding of the acrylic resin, and fully exerting the advantages of inorganic substances in terms of high temperature resistance and aging resistance without reducing the strength; 2. Different types of acrylic resins are used in combination to regulate the hydrophilic and lipophilic properties of the impregnation liquid system, thereby achieving good wettability on different inductive surfaces and increasing the application range of inorganic-organic impregnation liquid; 3. The inorganic component and the organic component coexist in the impregnation liquid, which can synergistically exert the advantages of inorganic impregnation liquid in terms of high temperature resistance and aging resistance, and the advantages of organic impregnation liquid in terms of high strength and high toughness; 4. The impregnation process is simplified, and the inorganic-organic impregnation liquid is only needed to be poured into a spin-off machine and heated to a specified temperature to operate the impregnation process of the inductor. DETAILED DESCRIPTION

[0015] The present application will be described in detail below with reference to examples.

[0016] Table 1 Formulation and composition As shown in the above table, the formulation and amount are prepared by the following method: a. Put the titanium dioxide powder into a bucket; b. Introduce 1 L of dispersion solution into the bucket, and then start stirring at a speed of 300-500 r / min; the dispersion solution can be ethanol, methanol, acetone, butanone, etc.

[0017] c. Slowly pour the coupling agent into the titanium dioxide powder solution and continue stirring for 2 h; when adding the coupling agent, attention should be paid to the dropping speed, and too fast speed will result in too thick coupling agent layer on the upper layer of titanium dioxide powder and too thin coupling agent layer on the lower layer of titanium dioxide powder; d. After stirring, pour off the supernatant, spread the titanium dioxide powder on a tray, and bake it in an oven at 60 ℃ for 1 h, then take it out for standby.

[0018] e. Take another container, add acrylic resin, then add the treated titanium dioxide powder, curing agent and active diluent, and stir the mixture uniformly with a stirrer for 1 h and at a speed of 400 r / min.

[0019] In the preparation process of the impregnation liquid of Comparative Example 1, the titanium dioxide powder is not pretreated, so the surface of the titanium dioxide powder is not wrapped with coupling agent molecules, and the other preparation processes are consistent with those of Examples 1-3.

[0020] The inorganic-organic impregnated solution mixed with the resin was injected into a spin-off machine, warmed to 80°C, then batch placed in an inductor, and after 1H of impregnation, the inductor was removed and allowed to dry for 2H, then baked at 150°C for two hours. The impregnated inductor was then tested as follows: Table 2. Comparison of partial mechanical properties of different formulations Performance Example 1 Example 2 Example 3 Comparative Example 1 Heat Distortion Temperature (°C) 200 231 265 128 Tensile Strength (MPa) 84 79 61 47 Tertiary Moisture-Sensitive Post-Tensile Strength (MPa) 55 60 59 22 Elongation at Break (%) 2.9 2.1 1.5 15

Claims

1. An impregnation solution for an inductor, characterized in that: The impregnation liquid is prepared from the following substances in parts by weight: 100 phr of acrylic resin, 1-2 phr of coupling agent, 10-20 phr of active diluent, 1-3 phr of curing agent and 30-40 phr of titanium dioxide powder with a particle size of 2-20 nm.

2. The inductor impregnation solution according to claim 1, wherein The acrylic resin is one or more of all-acrylic resin, silicone-acrylic resin or styrene-acrylic resin.

3. The inductor impregnation solution according to claim 1, wherein The coupling agent is one or more of a silane coupling agent, an aluminate coupling agent or a phthalate coupling agent.

4. The inductor impregnation solution according to claim 1, wherein The active diluent is one or more of polyethylene glycol glycidyl ether, allyl glycidyl ether or phenyl glycidyl ether.

5. The inductor impregnation solution according to claim 1, wherein The curing agent is one or more of isocyanate, pyridine or amino resin.

6. The method for preparing the impregnation solution for inductors according to any one of claims 1 to 5, wherein: The preparation method comprises the following steps: a. Take titanium dioxide powder and place it in a bucket; b. Introduce the dispersed solution into the barrel and then start stirring at a speed of 300~500r / min; c. Slowly pour the coupling agent into the titanium dioxide powder solution and continue stirring; d. Bake the treated titanium dioxide powder at 60 ° C for 1 h and set aside; e. Add acrylic resin to another container, then add the titanium dioxide powder, curing agent and reactive diluent treated in the above step, and stir the mixture evenly. The time and speed are 1 h and 400 r / min respectively to obtain an impregnation solution.

7. The method for preparing an impregnation solution for an inductor according to claim 6, wherein: The dispersing solvent in step b is one or more of ethanol, methanol, acetone or butanone.

8. Use of the impregnation solution for inductors according to any one of claims 1 to 5, characterized in that: The impregnation liquid is used for impregnation of inductors.

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