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Electret sheet

An electret, multifunctional monomer technology, applied in the direction of electret, electret electrostatic transducer, variable capacitor, etc., can solve problems such as complex procedures, achieve excellent piezoelectricity, improve piezoelectricity Effect

Active Publication Date: 2017-05-31
SEKISUI CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, Patent Document 1 discloses a method of miniaturizing air bubbles. Although higher performance than conventional electrets can be obtained, there is a problem that a complicated process is required.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1～8、 comparative example 1～3

[0088] Using a twin-screw extruder whose barrel temperature was adjusted to 170° C., the following synthetic resin composition was fully melt-kneaded, and extruded from a T-die to obtain a foamable resin sheet with a thickness of 0.3 mm. The synthetic resin composition is composed of a predetermined amount of homopolypropylene A (manufactured by Nippon Polypropylene Co., Ltd., trade name "NovatecPP EA9") shown in Table 1 or Table 2, flexural modulus of elasticity: 1800 MPa, melt flow rate (MFR): 0.5 g / 10 minutes), homopolypropylene B (manufactured by Japan Polypropylene Co., Ltd., trade name "NovatecPP EA8W", flexural modulus of elasticity: 1500MPa, melt flow rate: 0.8g / 10 minutes), homopolypropylene C (Nippon Polypropylene Propylene Co., Ltd., trade name "NovatecPP EG8", flexural modulus: 950 MPa, melt flow rate: 0.8 g / 10 minutes), linear low-density polyethylene (Prime Polymer Co., Ltd., trade name "Moretec0138N", density : 0.917kg / m 3 , melt flow rate: 1.3g / 10 minutes), tr...

Embodiment 9

[0091] (Example 9, Comparative Example 4)

[0092] Using a twin-screw extruder whose cylinder temperature is adjusted to 170°C, the following synthetic resin composition is fully melt-kneaded and extruded from a T-die to obtain a thickness of 0.3mm and an apparent density of 0.9g / cm 3The synthetic resin non-foaming sheet of synthetic resin, described synthetic resin composition is made of homopolypropylene A (manufactured by Nippon Polypropylene Co., Ltd., trade name "NovatecPP EA9") of the specified amount shown in Table 1 or Table 2, flexural modulus of elasticity: 1800MPa , melt flow rate (MFR): 0.5g / 10 minutes), linear low-density polyethylene (manufactured by Prime Polymer, trade name "Moretec0138N", density: 0.917kg / m 3 , melt flow rate: 1.3g / 10 minutes), trimethylolpropane trimethacrylate (TMPT) and glass spheres (manufactured by Sumitomo 3M Co., Ltd., trade name "Glass Bubble S60HS", average particle size: 50 μm, true Density (particle density): 0.6g / cm 3 )constitute...

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Abstract

The invention provides an electret with higher piezoelectricity. The electret sheet of the present invention is characterized in that it contains two kinds of synthetic resins that are incompatible with each other and these synthetic resins form a phase-separated structure, and the synthetic resin sheet obtained by cross-linking the above-mentioned synthetic resins with a multifunctional monomer passes through the charge. Charged by injection, therefore, in the interface of two kinds of synthetic resins that are incompatible with each other, apparently positive and negative charges exist in a polarized state. If an external force is applied to the electret sheet to deform the electret sheet, Then the relative positions of these positive charges and negative charges change, and a good electrical response is produced along with the change, therefore, the electret sheet has excellent piezoelectricity.

Description

technical field [0001] The invention relates to an electret sheet. Background technique [0002] Electret is a material formed by injecting charges into an insulating polymer material to permanently charge its interior. Electrets are formed into fibers and are widely used as dust collection filters and the like. [0003] It is known that a foam sheet made of a synthetic resin exhibits very high piezoelectricity comparable to ceramics by charging a cell film formed with cells and its vicinity. Therefore, it has been proposed that an electret obtained by using such a synthetic resin foam sheet be applied to a pickup, various pressure sensors, etc. by utilizing its excellent sensitivity. [0004] As a means of improving the piezoelectricity of such a synthetic resin foam sheet, air cells can be made finer. In addition, Patent Document 1 discloses a method of miniaturizing air bubbles. Although performance higher than conventional electrets can be obtained, there is a problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G7/02C08J5/18C08K7/22C08L23/04C08L23/10C08L101/12H04R19/01
CPCC08K7/22H01G7/023H01G7/028H04R19/016C08L23/10C08L23/04C08L23/06C08L23/12C08L2203/14C08L2203/20C08L2205/20C08J9/0061C08J9/103C08J9/32C08J9/36C08J2201/026C08J2201/03C08J2323/06C08J2323/12C08J2423/06C08J2423/12C08J3/246Y10T428/249953C08L51/06H01G7/02C08J5/18H04R19/01H10N30/857
Inventor 内田一穗冈林赏纯田实佳郎
Owner SEKISUI CHEM CO LTD
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