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Adhesive sheet

A technology of adhesive sheets and adhesive layers, applied in the direction of adhesives, adhesive types, heat-activated films/sheets, etc., can solve the problem of reduced bonding strength, reduced heat-resistant bonding strength, and filling of concave-convex adherends Poor thermal conductivity and other problems, to achieve the effect of balanced characteristics and excellent thermal conductivity

Inactive Publication Date: 2017-02-15
TERAOKA SEISAKUSHO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In Patent Document 1, the purpose is to securely fix the adhesive sheet to the coil of the stator and the stator core, and there is no study on the rapid curing property and heat resistance (for example, the suppression of the decrease in the adhesive strength at high temperature).
In Patent Documents 2 and 3, since the middle layer of the adhesive sheet is a foamed layer, and there is a non-foamed adhesive layer on the outside, the filling property and thermal conductivity of the uneven adherend are poor. Rapid curing, heat resistance (e.g. suppression of decrease in bond strength at high temperatures) have not been studied
In Patent Document 4, the main purpose is to improve the adhesiveness and workability, and there is no study on the rapid curing property and heat resistance (suppression of the decrease in the adhesive strength at high temperature).

Method used

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  • Adhesive sheet
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0165]

[0166] On one side of the substrates K1a to K10, apply an expansive adhesive (mixtures 2 to 3 and 6 to 7) After that, the solvent was removed by drying at 90° C. for 5 minutes to form an expandable adhesive layer. A polyester film with a thickness of 38 μm, one side of which had been subjected to silicone mold release treatment, was pressed on the surface of the expandable adhesive layer with a hot roller heated to 100° C. to obtain a product in the first step. On the other side of the base material of the first process product, apply the same type of expandable adhesive combination so that the thickness after drying is about 35 μm (about 25 μm in Example 8, and about 30 μm in Examples 9 and 10). After that, the solvent was removed by drying at 90° C. for 5 minutes to form an expandable adhesive layer. A polyester film with a thickness of 38 μm, one surface of which was subjected to a silicone release treatment, was pressed on the surface of the expandable adhesive...

Embodiment 11

[0168] Apply an expansive adhesive (combination 8) on one side of a 38 μm silicone heavy release / release treated polyester film so that the thickness after drying is 25 μm, and then dry at 90°C for 5 minutes to remove the solvent and form Expandable adhesive layer. On the surface of the expandable adhesive layer, one side of a silicone light release / release treated polyester film of 38 μm was bonded and wound up to obtain an adhesive sheet of Example 11. When this adhesive sheet is used, the release-treated polyester film on both sides is peeled off, and it is used as a substrate-less adhesive sheet composed only of an expandable adhesive layer.

[0169] The adhesive sheets of Examples 1 to 11, Reference Examples 1 to 3, and Comparative Examples 1 to 2 above were evaluated by the following methods. The results are shown in Tables 3-5.

[0170] [Thickness of adhesive sheet]

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Abstract

Disclosed is an adhesive sheet comprising a base member (1) and an expansive adhesive agent layer (2) formed on one surface or both surfaces of the base member 1, wherein the expansive adhesive agent layer (2) comprises: an epoxy resin that comprises a polyfunctional epoxy resin; a phenolic resin that serves as a curing agent; an imidazole compound that serves as a curing catalyst; and a temperature-sensitive foaming agent. The adhesive sheet particularly has a good balance among properties including rapid curability, heat resistance and adhesion properties. The adhesive sheet also has satisfactory filling properties, and therefore has excellent various properties associated with the satisfactory filling properties, including heat conductivity.

Description

technical field [0001] The present invention relates to an adhesive sheet having an expandable adhesive layer containing an epoxy resin and a temperature-sensitive foaming agent. The adhesive sheet of the present invention is used, for example, between two members such as a stator and a coil in a motor generator, and is expanded, foamed, and cured by heating and filled into the gap to bond the members to each other. useful in. Background technique [0002] Epoxy resin adhesives have excellent heat resistance and strong adhesiveness, so they are widely used for component bonding, structural bonding, etc. [0003] For example, in motors of electric vehicles and hybrid vehicles that have spread rapidly in recent years, coils wound with enameled wires are fixed to stator cores with epoxy resin. In the previous method, an insulating paper was inserted between the conductor coil and the stator core, a liquid epoxy resin adhesive was injected into the space (gap) between the cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J7/02B32B27/18B32B27/38C09J5/06C09J5/08C09J11/04C09J11/06C09J163/00C09J175/04H02K3/30H02K3/34B32B27/00C09J7/10C09J7/21C09J7/29C09J7/35
CPCC09J7/29C09J7/255C09J7/30C09J7/10C09J5/06C09J5/08C09J11/04C09J11/06C09J163/00C09J175/04H02K3/345C08K2003/222C08K2201/003C09J2400/263C09J2400/283C09J2475/00C09J2463/00C09J2301/124C09J2301/122C09J2301/408C09J2301/312C08L63/00C08K3/22C08K3/34C08K7/14C08L75/04B32B27/00B32B27/18B32B27/38H02K3/30H02K3/34B32B5/022B32B5/18B32B5/20B32B5/22B32B5/24B32B5/245B32B7/06B32B7/12B32B27/10B32B27/12B32B27/16B32B27/20B32B37/1207B32B3/06B32B2037/1253B32B2250/02B32B2250/03B32B2250/04B32B2250/05B32B2250/40B32B2250/42B32B2255/02B32B2255/12B32B2255/26B32B2262/101B32B2266/0271B32B2307/206B32B2307/302B32B2307/308B32B2307/542B32B2307/544B32B2307/546B32B2307/732B32B2307/748B32B2457/04C08J9/0028C08J9/0061C08J9/0066C08J9/0085C08J9/0095C08J9/32C08J2207/02C08J2363/04C08J2461/04C08J2463/02C08J2475/04C08K5/3445C08K9/10C09J2461/00C09J7/35B32B27/26B32B2307/306C09J2301/412Y02T10/64B32B1/00C09J7/20B32B2305/30C09J7/21
Inventor 雷鸣户高胜则
Owner TERAOKA SEISAKUSHO
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