JPS6366242A - Air-permeating material - Google Patents

Abstract

PURPOSE:To obtain an air-permeable material having improved flexural modulus, flexural strain at break and crack resistance and suitable for filter, material for suction-holding, etc., by compounding solid particles having specific particle diameter with a polyepoxide and its hardener. CONSTITUTION:The objective material can be produced by compounding (A) solid particles having a void ratio of >=40vol% and an average particle diameter of <=100mum (e.g. aluminum powder) with (B) a polyepoxide forming a hard resin by curing (e.g. glycidyl compound of bisphenol A, etc.) and its hardener (e.g. diaminodiphenylmethane) and (C) an oil-modified bisphenol A diglycidyl ether polyepoxide. The weight ratio of the polyepoxide of the component B to the component C is 95:5-70:30 and the volume ratio of the component A to the sum of the components B and C is 90:10-70:30.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a high-strength breathable member useful as a filter, a suction holding material, or a mold material for vacuum forming.

(Prior technology) Known examples of air-permeable fabrics include those made by adding and sintering ether 7-lysate as bindu to ceramic thread powder, and those made by coating stell powder with epoxy resin and curing it by heating after molding. ing.

However, in the former case, other problems remain in dimensional accuracy, such as the need for high temperatures for sintering. In the latter case, it is desired to improve mechanical strength, particularly crack resistance.

(Intermediate Point to be Solved by the Invention) The present invention provides an air-permeable member comprising solid particles having an average particle diameter of 100 μm or less, polyepoxide, and a curing agent thereof. The overall purpose is to improve rack resistance by improving bending deflection at break.

(Means for solving the problem) The following tA), IB) and tQ' (r) A breathable member (N) formed by blending and curing as essential components Solid particles (B) with an average particle diameter of 100 μm or less
Polyepoxide that forms a hard resin after 6e conversion and its curing agent FC) This relates to oil-modified bisphenol A diglyfusyl ether polyepoxide, which is a complete blend of oil-modified bisphenol A diglyfusyl ether polyepoxide in a conventional hard polyepkind/curing agent system. All the features are the same.

Internally oxidized polyepoxides such as oil-modified bisphenol A diglycidyl ether polyepoxides are
The cured product itself is soft, and when blended with hard polyepoxides such as bisphenol A diglycidyl ether, it has the property of making the cured product flexible. On the contrary, the bending modulus of elasticity is improved, and the crack resistance is improved.

In the present invention, the solid particles with an average particle diameter of 100 μm or less include metal particles such as aluminum, nickel, and iron, as well as glass, warping particles, inorganic particles such as silicone carbide, and plastics such as hardened epoxy resin. Particles with a size of 2" or more are used.The porosity of the solid particles used is important for maintaining air permeability, and a certain amount of solid particles are used. It is desirable that the porosity (powder porosity) determined by moving the container up and down and when the volume becomes constant is 40% by volume or more.

The polyepoxide and its curing agent that form a hard resin after curing include glycidyl compounds of bisphenol A, F, and S, glycidyl compounds such as phenol novolac and cresol novolac, glycidyl compounds of aromatic amines, and cycloaliphatic epoxy resins. Glycidyl compounds with bisphenol A in % are preferred. As a curing agent, it is selected from aromatic diamines such as diaminodiphenylmethane and diaminodiphenylsulfone, acid anhydrides such as hexahydrofanhydride xfli and endomethylenetetrahydroditalic anhydride (ewenol novolak resin, etc.), and as a curing accelerator. An imidazole compound or an amine complex of boron trifluoride can be used in combination.

Oil-modified bisphenol A diglycidyl ether-based polyepoxide is a liquid F15 plasticized polyepoxide obtained by total addition of bisphenol A diglycidyl ether to fuel oil having an -OH group in the molecule.

After curing, the blending ratio of the polyepoxide to form the hard resin and the oil-modified bisphenol A diglycidyl ether polyepoxide is changed to 95=5 by weight to 70:30. If the amount of fat-modified bispheno-3A diglycyl ether polyepoxide used is more than 70:30 (if this is the case, not only will the effect of improving the flexural modulus become smaller;
There is a risk that heat deformation resistance will be reduced and practicality will be impaired.

In addition, the blending ratio of solid particles with an average particle size of 100 μm or less, the polyepoxide that forms a solid resin association after curing, its curing agent, and the oil-modified bisphenol A diglycidyl ether-based polyepoxide is 90:10 by volume. ~7[
1:6[Used in 1.

(Function) The brittleness of the cured epoxy resin is improved by assembling the oil-modified bisphenol A diglycidyl ether polyepoxide to the polyepoxide that is cured to form a hard resin. (
B) Polyepoxide that hardens to form a hard resin and its curing agent, oil-modified bisphenol A diglycidyl ether polyepoxide is blended as an essential component and cured to improve the flexural modulus as well as the bending deflection at break. It has become possible to manufacture breathable members with excellent crack resistance.

(Example) [Example 1] A total of one resin composition (A+) was mixed and adjusted at the following ratio.

Polyepoxide that forms a hard resin after curing (Epikoat 828; Bisphenol A diglycidyl ether manufactured by Yuka Shell Ebokiku ■) 21.2W
t part Same as above curing agent (HT972; aromatic diamine manufactured by Yuka Zoel Ebuki/■) 5.9#Oil-fat modified bisphenol A diglycidyl ether polyepoxide 18
1 (Evomic R-151; manufactured by Mitsui Petrochemicals) Solvent (
Methylene chloride) 31.5F Next, aluminum particles (average particle size 44 μm or less, Howder porosity 50%)
140Wt part, nickel particles (average particle size 44μ or less,
Howder porosity 54%) 19OWt part is mixed in a mixing machine, and the Vc tsukuda composition (add it little by little while mixing).After light mixing, spread it on a cotton cloth and air it. Air-dry for about 6 hours while soaking.The obtained epoxy resin-covered solid sheet is loosened and heated from the bottom to the mold.

Next, 50℃/12 hours + 120℃/1 hour + 150℃/
Cured under conditions of 1 hour + iao℃/1 hour to a thickness of approximately 8 m.
A molded body of m was obtained.

The bending properties of the obtained molded body were evaluated according to JIS-69+1. The test conditions were a bending speed of 4 mm, 7 minutes, and a distance between fulcrums of 106.61111 Tl.

The test results are shown in Table-1.

[Example 2] Epicort 828 was 18.7 Wt, Epomic R-1
Example IK was followed except that 6.3 Wt parts of 51 and 5.5 Wt parts of HT972 were used.

[Comparative Example 1] 25% of Epicoat 828, OWt part, Evomic R-1
The procedure of Example 1 was followed except that 51 was OWed and the total part of HT972 was 6.5 Wt.

[Comparative Example 2] Instead of Epicort 828 and Evoic R-151, wood end carboxyl-based liquid poly(butadiene-acrylonitrile) (CTBN) modified bisphenol A/nglycidyl ether polyepoxide (Epicron TSR-96
0; (BTCN content 15%) Dainippon Ink Kagaku Koka ■
衾) Example 1Vc was followed except that the total amount was 25 Wt parts and HT972 was 4.9 Wt parts.

Table 1 (Effects of the invention) As shown in the results shown in Table 1, the flexural modulus and bending deflection at break were the same as above at the distribution rate of oil-modified bisphenol A diglyphyl ether polyepoxy 7. ,
Therefore, cranking was less likely to occur due to bending stress on the molded body.

Claims (1)

[Scope of Claims] 1. A breathable member formed by blending and curing the following (A), (B) and (C) as essential components. (A) Solid particles with an average particle size of 100 μm or less (B) Polyepoxide and its curing agent that form a hard resin after curing (C) Oil-modified bisphenol A diglycidyl ether polyepoxide 2, solid particles with an average particle size of 100 μm or less The breathable member according to claim 1, wherein the air-permeable member has aluminum powder as a main component and has a porosity of 40% by volume or more. 3. The breathable member according to claim 1, wherein the polyepoxide that forms the hard resin after curing is a bisphenol A diglycidyl ether polyepoxide, and the curing agent is one containing aromatic diamine as a main component.