TW591076B - Epoxy resin of electromagnetic interference suppression and manufacturing method thereof and an inductor applied in the electromagnetic interference suppression - Google Patents

Abstract

According to the prevent invention, the components of the inductor include a ferrite and an epoxy. The sintered powder of the ferrite is mortared, and is added with the epoxy which functions as the binder. The initial permeability of the ferrite is greater than 250 (mui > 250), and the diameter of the powder of the ferrite is smaller than 0.35 (phi < 0.35). Thus, the fine powder will entirely shield the electromagnetic waves to prevent the electromagnetic interference. The epoxy includes two parts, that is, bisphenol A and epichlorohydrin to make the universal epoxy having an epoxy equivalent weight (EEW) ranged between 185 and 195. The hardener adopts the modified amine whose amine value is 170 ± 20. In such a manner, the epoxy and the hardener are added into the powder of the ferrite the mixture is stirred evenly, thereby making the EMI epoxy resin that can prevent electromagnetic interference. An epoxy resin of electromagnetic interference (EMI) suppression includes a ferrite and an epoxy. The EMI epoxy resin can be hardened quickly, has great resistance to heat and has great resistance to acid and alkaline. Thus, the EMI epoxy resin can be directly coated on the high frequency response member of the communication equipment to prevent interference of noise in the air addition, the EMI epoxy resin can be applied on package the inductor to enhance the feature of the inductor, that the inductance of the inductor can be enhanced by least two times.

Description

591076 V. Description of the invention (1) The technical field of the invention The invention belongs to the technical field of electromagnetic interference prevention materials, and particularly relates to the preparation of ferrite magnet materials (Ferrite) and epoxy resin (E ρ ο X y) to prevent Electromagnetic interference colloid, its manufacturing process and its application to inductive components. /, [Previous technology] With the miniaturization of electronic products and the increase in demand for high-speed computing electronic components, electromagnetic interference (EMI, Electromagnetic)

Interference), radio wave interference (RFI, Radio Fre called)

Interference) and electrostatic discharge (ESD, Electrostatic, protection is also very important. Miniaturization and high density of electrons: magnetic wave shielding and electrostatic protection treatment, and electronic components are in production; it is necessary to ensure that the final product is used uniformly. Electrostatic protection materials are needed to prevent the static I voltage.-Once the insulation of electronic components can withstand the process, the general polymer materials are good molecular tables: production: usually greater than 1012Q / cm2 'easy in high quality (such as : How to gather electricity. Therefore, do conductive modification to black directly in the polymer, all belong to 111 ne, etc.) or add conductive fillers (such as conductive carbon accumulation or the resistance requirements of the two electric devices, and often The use of electric trowels is based on different-as antistatic materials, often divided into 'mainly includes four parts: the first commonly used in packaging materials or falling materials ^ t materials. The second is ESD protection, commonly used in electronic secondary The second is the shielding of EMI / RFI. The main shells of shells and aluminum products can also be applied with high voltage 591076.

ESD protection. The fourth is the conductive bonding part, which is mainly used for repainting, silver glue and anisotropic conductive voltage. With the continuous improvement of global electronic technology applications, innovation continues to play an indispensable role, and ferrite buckets are the core of electronic devices such as inductors, filters and electromagnetic interference filters ... The magnetic permeability and operating frequency of ferrite materials require P grids per day.

Ik's development of electronic products is to make short, small, light, and thin active components and passive components must be made into small electronic components. The present invention is directed to the development of inductive elements. Second, f: The material of the piece is mainly ferrite magnet, and the material of the ferrite magnet is: to prevent electromagnetic interference. If there is-a kind of colloid can be]: ::. ： The electrical properties are improved. This is the current research of inductor manufacturers all over the world. ^ The present invention is an epoxy resin (EpOxy) made of ferrite material and χ, ^ magnetic interference (EMI) function. Glue with & = 止 ^ ii (Ferle) V / &quot; // Λ}; ^ ^ ^ t. The colloidal material for ling is the best consideration. Theoretically, the seal made of milk can be added with EM glue to improve the electrical residual value; other characteristics of the closed magnetic circuit inductor are improved for the element factor Q value and standard deviation Tolerance) * IDC, quality The main components of the present invention include There are ferrite magnets and rings. Oxygen resin

Oxidation with sintered iron, and then adding a little == After the grinding process, the fine initial magnetic permeability of the powder is between 2 and 50: two months; = Binder 'The ferrite magnet material is less than 0.35 (0 &lt; 〇35 ( \ &gt; 25λ〇), the particle size of the ferrite magnet powder is generating electromagnetic interference. "Second :: · can be made of powdered ... type epoxy tree (rAr 2rohydrin) as a raw material, made of universal amine Additives and hardeners are added to the ferrite magnet powder: 20 made of Cheng Cheng, rapid curing, warming, good heat resistance, good acid and alkali resistance, epoxy resin colloids to prevent electromagnetic interference. In addition, if the inductance element is compared with the closed magnetic circuit coil with a same size and unit inductance value, the closed magnetic circuit coil will have a higher inductance value than the open magnetic circuit coil south, and the Q value will be better, but the withstand current value will be lower. minus 2. If a single shielded magnetic circuit inductance element is used, the following technical considerations will be made in the production:

1. The drum core (DR core) must be in the center of the ring core (RI% cor e) as much as possible. 2 · The winding is required to be flat. 3 · Component assembly strives to be hermetically sealed. However, if the epoxy resin colloid of the present invention is used to fill the center of a DR core and a RI core, the requirements of the above problems can be greatly reduced. Because the ferrite magnet material of the epoxy resin has been

591076 V. Description of the invention (6) [Embodiment] The "anti-electromagnetic interference colloid of ferrite magnets and epoxy resins" of the present invention is prepared, which is described by way of example as follows: 1. Preparation &quot; i = 700 ferrite magnet powder. Fe2O3 = 327.7g, Ni0 2 32.7g, ZnO = 108.5g, CuO 2 34.5g. Put it in a ball mill tank (containing 1Kg 0-20 osmium oxide ball), add 40 0 ml of water and BYK-111 — 2 g of dispersant. Ball milled for 2 hrs. 2 · Dry the above mixed slurry at 120 ° C.

3. The dried powder is crushed with a sieve (mash = 80), and then crushed at 90 ° C.

Sintered for 3 hrs. That is, a ferrite magnet powder having a function of preventing electromagnetic interference is obtained. 4 The sintered ferrite magnet powder has magnetic properties, and is then put into a ball mill containing 0 30: 4 1: 0: 0 3 = 2: 3: 5 Grind in a jar at a low speed of 25 rpm for 18 hours. Particle size &lt; 0.3 5 // m. 5. Dry the fine ferrite magnet powder and crush it with a fine sieve 200. : _ Take the epoxy resin main agent = 10 g, hardening agent 6. Formulate ferrite Epoxy Resin ..., ... called 丄 用 一 丄 υ g, hardening agent = (main agent: hardening agent = 1 〇〇: 1 6 ~ 2] ,, Japanese i group u

i0 ") Mix and stir well, the quality of 3 Fernte = 108g and dispersant Bγκ —n 々 Junli ^. Huo Shi said 1 Λ J eight 111 = 1§.

Just fine. Epoxy added ΐ: ΐ〇 ~ 15% J Note: EMI Epoxy resin can be added with a little toluene if the viscosity is too high. The following test design is for three different inductor components on the market.

591076 Description of the invention (9) Please refer to the tenth figure Please refer to the eleventh figure Please refer to the twelfth figure RH 0910 series SH 5028 series SS 0 6 0 3 series U core DR C〇re the gap between the hem and the ring-shaped iron core RI core to discuss the true closed magnetic circuit; t Γ f and epoxy anti-electromagnetic interference colloid (A) is not electric U 7L The improvement of the early inductance value is as old as the RH 0910 series. Min 焱 Yan⑴ County Shuoyu 臌 / Because of the design of the framed iron core RI core 疋 The plastic bakelite is used as the shell, and the piano is wauw ° With magnetic shielding function. If you use a needle to inject the ferrite magnet, ^ eight spleen plant green &amp; *, anti-electromagnetic interference colloid (A) 乳: Ι:: that! This component is a magnetically shielded r :: closed magnetic field. Second: the gate finds that the inductance value of the open magnetic circuit and the closed magnetic circuit has been increased by 2 times compared to the inductance value of the car's closed magnetic circuit. Next, we use a different type of m m L 沭 德 德 L L 作 products as a drum core DR core hem ring anchor τ soil anchor. # FREE l Tian Tiexin's RI Core wall-to-wall distance comparison of straight magnetic shielding effect. ^ Series of RH series RI cores are completely in contact with each other, s iron, and there is a small gap between the rows of "6 and plastic rings". From the original magnetic shield of ordinary epoxy resin, the magnetic enhancement of the epoxy resin / electricity with EMI working force is compared. From the thirteenth figure, it can be found that the sense value of P ^^^ is shown in Figure 13. The shield ri ... τ originally opened the magnetic circuit inductance element Feng Luo Jingjing iron core RI core into a closed magnetic circuit inductance, its table J-shaped, electric drink value Gap-following

591076

V. Description of the invention (10) Increased and decreased significantly. The situation is the same after filling the EMI epoxy resin with ferrite magnet and epoxy resin. The larger the gap, the smaller the inductance value increases. Of course, the increase rate of the inductance value is only a phenomenon. In order to discuss in detail, the unit inductance value of the ring-shaped iron core RI core must be considered. We have already known that the prevention of the ferrite magnet and epoxy resin in the inductor element Electromagnetic interference gel (EMI epoxy resin) is helpful to increase the inductance value of the component. After three, you can engage in the following research and development. 1. Manufacture special small-size electric reduction components with super-South inductance value 2. Under certain inductance value requirements, the RDC and IDC characteristics of the components are improved by more f wire diameter. 3. Product positive and negative The standard deviation is too large, you can use the drum core DR core with a lower unit inductance to reduce the Tolerance (theoretically, the greater the unit inductance of a magnetic material is, The rather contradictory electric field and magnetic field are "reached by the larger field", then the relative electric field will be about 0.3 times smaller than the toroidal iron core core C0r ^ unit inductance value. Oxygen re-made as above Μ Λ (&quot; 1 &gt; 25G) or above. Therefore, it is necessary to use the ferrite magnet ’s initial magnetic permeability at :; the value decreases by two A to improve the characteristics of the inductor.… Below 8 " At first

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Claims (1)

591076 _Case No. 92105146_year month__ Sixth, the scope of the patent application, the anti-electromagnetic interference colloid of grease. 5. —A kind of "open magnetic circuit inductance element to prevent electromagnetic interference", which mainly includes E-shaped round core (E type ring core), Surface mount base type core (core bead) and wire package, its characteristics The reason is that the E-shaped round iron core and the surface adhered with the magnetic baht iron core and a part of the surface of the wire package have anti-electromagnetic interference colloids whose main components are ferrite magnets and epoxy resins. Interference inductive element ^, the surface of the inductive element line has a layer of anti-electromagnetic interference colloid whose main components are ferrite magnet and epoxy resin. Page 18 2003. 12. 15.020