Magnetic sheet composition, magnetic sheet, and process for producing magnetic sheet

A technology of magnetic sheet and composition, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of poor curing and reduced reactivity, and achieve no corrosion, no unpleasant odor, low temperature-fast curing sexual effect

CN102131867AActive Publication Date: 2011-07-20DEXERIALS CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-07-20

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Abstract

The object of the present invention is to provide a magnetic sheet composition, a magnetic sheet and a process for producing a magnetic sheet, wherein the magnetic sheet composition can reduce unnecessary electromagnetic waves emitted from electronic equipment and can suppress electromagnetic interference occurring in electronic equipment, that can be cured rapidly at a low temperature, does not generate odor, and does not cause corrosion. The magnetic sheet composition is characterized by comprising an aluminum chelate-based latent curing agent, a silanol compound or alkoxysilane compound represented by formula (A), an epoxy resin, an acrylic resin, and a magnetic powder. Formula (A) is (Ar)mSi(OR)n, wherein, m is 2 or 3; the sum of m and n is 4; Ar is an optionally substituted aryl group; R is a hydrogen atom or a methyl group; and, when n is two or more, the Rs may be the same as or different from each other.
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Description

technical field

[0001] The present invention relates to a magnetic sheet composition used as a magnetic sheet material, a magnetic sheet and a preparation method of the magnetic sheet. Electromagnetic barriers. Background technique

[0002] As the application of the magnetic sheet, a noise suppression application or an RFID application can be mentioned. In terms of noise suppression applications, with the rapid development of miniaturization and high frequency of electronic equipment represented by personal computers and mobile phones, in these electronic equipment, in order to suppress noise interference from external electromagnetic waves and internal electronic equipment. Mutual interference of the generated noise, various noise countermeasures are implemented, such as installing a magnetic sheet (noise suppression sheet) near the noise emitting source or the receiving source.

[0003] The magnetic sheet is a magnetic coating (magnetic sheet composition) containing allo...

Examples

preparation example Construction

[0162] The preparation method of the magnetic sheet of the present invention is not particularly limited, and can be appropriately selected according to the purpose, but preferably can be prepared by the preparation method of the magnetic sheet of the present invention described below.

[0163] (Manufacturing method of magnetic sheet)

[0164] The production method of the magnetic sheet of the present invention includes at least a magnetic layer formation step and a shape transfer step, and may further include other steps appropriately selected as necessary.

[0165]

[0166] The magnetic layer forming step is to form a magnetic sheet containing at least an aluminum chelate latent curing agent, a silanol compound or an alkoxysilane compound represented by the following formula (A), an epoxy resin, an acrylic resin and a magnetic powder. A step of molding the composition to form a magnetic layer.

[0167] (Chemical formula 9)

[0168] (Ar) m Si(OR) n Formula (A)

[0...

Embodiment 1

[0200] -Preparation of aluminum chelating agent class latent curing agent (1)-

[0201] Put 800 parts by mass of distilled water, 0.05 parts by mass of a surfactant (Niyu Rex R-T, NOF Co., Ltd.) and 4 parts by mass of polyvinyl alcohol (PVA-205, from Kuraray Co., Ltd.) as a dispersant into a thermometer with a thermometer In a 3-liter interfacial polymerization vessel, mix well. Then drop into the oil phase solution into the solution, emulsify and mix it with a homogenizer (10000rpm / 5 minutes), and carry out interfacial polymerization at 80° C. for 6 hours; 24% isopropanol solution of aluminum acetylacetoacetate (aluminum chelate D, Chuanken Fine Chemical Co., Ltd.), 70 parts by mass of methylene diphenyl-4,4'-diisocyanate (3mol) Methylolpropane (1mol) addition product (D-109, Mitsui Takeda Chemical Co., Ltd.), 30 parts by mass of divinylbenzene (Merck Company) and 0.30 parts by mass of free radical polymerization initiator (Peroyl L, NOF Corporation ) obtained by being diss...

Embodiment 2～24

[0211] -Preparation of Magnetic Sheet-

[0212] In Example 1, the consumption of the aluminum chelate latent curing agent (1), the consumption of the triphenylsilanol (TPS), the pressure holding temperature, the pressure holding time And at least one of the pressurization time was changed as shown in Tables 1 to 4, except that it was the same as in Example 1 to obtain a magnetic sheet.