JPS6089348A - Thermosetting resin molded shape with high conductive layer and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention This invention relates to a shallow molded product and its production, and more specifically, to obtain a molded product with excellent radio wave reflection characteristics by a laminated structure in which a highly conductive layer is provided in the middle layer of the molded product. The present invention relates to a thermosetting resin composition molding material and a molding method using the same.

Reinforced plastics, which are mainly made of glass fiber as a reinforcing material, have become the number one choice in the field of replacing metals due to their excellent functionality, such as light weight, strength, corrosion resistance, moldability, freedom of design, and cost performance. In recent years, it has expanded to include fields that require electromagnetic shielding properties and radio wave reflection properties.

A method for imparting high conductivity to electrically insulating reinforced plastics is as follows: 1) Uniformly dispersing conductive substances such as short metal fibers and gold flakes in a resin matrix;
λ) A conductive layer of a mat or cloth of conductive fibers such as metal fibers, surface metallized glass fibers, carbon fibers, etc. is placed inside the molded product.
C-forming: etc. can be mentioned.

(Resin ma) How to uniformly disperse conductive substances in IJ links l) Electromagnetic shielding characteristics -? In order to satisfy the radio wave reflection properties, a considerable amount of addition is required, which leads to a decrease in flow properties and strength properties. However, there are disadvantages such as making molding more difficult.

To deal with this, various methods of forming a conductive layer of a conductive fiber mat or cloth in a molded product have been studied, but the known methods do not allow l) tearing of the conductive fiber layer during molding;
Otherwise, elongation occurs, and the surface density of the conductive layer partially decreases. 1, 2) There are still drawbacks such as the radio wave reflection characteristics deteriorate or become uneven due to waving of the conductive layer surface, etc. . The former is thought to be because the conductive layer moves when the resin matrix flows, and the latter is thought to be due to the movement of the conductive layer and the irregularities inherent to the 2# conductive fiber.

The present inventors have focused on the drawbacks of the method for forming conductive fibers in a molded article, and have completed the present invention by repeatedly studying ways to improve the method.

That is, an object of the present invention is to provide a thermosetting resin molded product having excellent radio wave reflection characteristics, which comprises a glass fiber layer mainly containing short fibers, a conductive fiber layer,
The thermosetting resin wraps three long fiber glass fiber layers, and the long fiber glass fiber layer is provided on the surface side of the molded product of the conductive layer. 0.0 from the surface of the molded product on the fiber layer side. A thermosetting resin molded article characterized in that a conductive layer surface is formed at a position f of /-7.0 mm, a resin composition for molding the same, and a molding method are presented.

The glass fibers mainly consisting of short fibers used in the present invention are
This is a glass fiber reinforcing material commonly used for reinforced plastics, and glass mats, glass substrates such as Chimbuto 9 strands with fiber lengths of about 1 inch are suitable.

Examples of the conductive fibers of the present invention include metal fibers such as aluminum, brass, and iron, surface metalized glass fibers, carbon fibers, etc., and the preferred shape of the fibers is long fibers, especially 12 continuous long fibers. Among these, surface-metalized glass fibers include glass fibers coated with aluminum or nickel.
This is preferable because the male prototype is relatively small and there is little reduction in electrical conductivity due to surface oxidation, and in particular, continuous glass fiber mat coated with aluminum is extremely suitable for the present invention. Carbon fibers are suitable because they are chemically stable, regardless of the various grades based on strength and modulus of elasticity.

Suitable long fiber glass fibers of the present invention include glass cloth with a coarse weave to the level of a plain weave, a continuous strand mat, and the like.

The composition of the unsaturated polyester resin used in the present invention is not particularly subject to any restrictions. For the purpose of moldability and modification of molded products, other thermosetting resins such as vinyl ester resin and diallyl heptalate resin, and
Furthermore, in addition to the curing agent, a low shrinkage agent, a thickener, a filler, a mold release agent, etc. may be mixed.

When molding a thermosetting resin molded product that has good radio wave reflection properties, if a certain degree of wall thickness and rib structure reinforcement is required to improve the mechanical strength of the molded product, this book is recommended. It is effective to overlay and integrally mold a suitable thermosetting resin composition for molding on the back side of the laminated structure of the invention, that is, in contact with the glass fiber layer mainly composed of short fibers, and it is effective to integrally mold the thermosetting resin composition for molding. It is something. In this case, in order to avoid problems such as distortion, deformation, and cracking of the molded product, the resin mixture should have similar or common components. It is preferable to integrally mold a resin composition impregnated with a resin mixture.

In the thermosetting resin molded product having a highly conductive fiber layer obtained by the present invention, the surface of the conductive layer is 0.7 to 1.0 mm from the molding surface via the long fiber glass fiber layer.
It is formed at the position of This can be achieved by varying the thickness and number of long glass fiber mats or cloth used and the composition of the resin mixture. It is believed that the presence of the long fiber glass fiber layer is effective in suppressing movement of the conductive fiber layer during molding. When the conductive fiber layer approaches the surface of the molded article within θ, tmm, movement and waving of the conductive layer occur. Moreover, if the thickness of the surface layer including the long fiber glass fiber layer exceeds 0.00000 mm, the radio wave reflection characteristics will deteriorate. In the molded product according to the present invention, the unevenness of the conductive fiber layer is 0.2 m.
m or less and is extremely flat.

Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 A resin mixture consisting of an unsaturated polyester resin, a low shrinkage agent, a thickener, a filler, a curing agent, and a mold release agent was applied to two polyethylene sheets per J 00117 m2.
After applying the resin mixture to a uniform thickness, sprinkle it evenly on the surface of one sheet coated with the resin mixture to a thickness of fggoll/m2 of short glass fibers cut to a length of 71 inches. On top of this, another polyethylene sheet coated with the resin mixture was placed on top of the other with the resin mixture coated side in contact with the short glass fiber layer. By passing this material through a pressure roll, the resin mixture is impregnated into the glass fibers, so that the glass content is S%, the unit weight is 3,! A sheet-like resin composition (SMC-/) of kg/m 2 was prepared.

The unsaturated polyester resin mixture described above was then applied to two polyethylene sheets to a uniform thickness of 3oo11/m2 per sheet, and on the coated side of the resin mixture of one sheet, an aluminum layer of too 9/2 was applied. A coated glass fiber mat (Kuchichimo Grass Mat: Undy Co., Ltd., USA) is placed, and the other sheet is placed on top of it with the resin mixture applied side in contact with the mat, and the mat is impregnated with the resin mixture through a pressure roll. A conductive sheet-like resin composition (SMC-, 2) was prepared.

Both SMC-/ and SMC-co are
It was placed in an air constant temperature bath at ℃ for q days to thicken it.

Bottom surface of semi-positive mold VC2/cm
/am unit weight 1097m glass cloth (Microglass cloth YEM 1O1: Nippon Glass Fiber)
Place the /9cmx/9cm SMC-1 on top of it.
Further on top of that / 1 cm X / A cm (1)
The polyethylene sheets on both sides of each SMG-/ were peeled off and stacked on top of each other, and then heated and compressed to form a 20 cI
A flat plate of n×20 cm and a thickness of approximately y, Omm was prepared. A sample piece of 4 mm x 11 mm was cut out from this flat plate, and the radio wave reflection characteristics of the glass cloth surface were measured. The results were good as shown in Table VC.

Example A sheet-like resin composition (SMC-J) having the same composition as Example /+7) SMO-/ was prepared using an SMO [sheet molding compound] manufacturing machine and subjected to a thickening treatment.

Next, in the process of creating SMC-J using the VcSMC manufacturing machine, the amount of scattered glass short fibers was set to qto9/m,
Furthermore, between this short glass fiber layer and the resin mixture coated surface of one polyethylene sheet, 1001! A sheet-like resin composition (SMO-11) having a composition in which aluminum-coated glass fiber mats of /m' were sandwiched was prepared and subjected to a thickening treatment.

, As in Example 1, glass cloth and S are placed on the mold from below.
Three layers of MC-4' and SMC-J were piled up and compression molded to create a flat plate, and a sample piece was cut out to measure radio wave reflection characteristics.

Example J In the process of creating a sheet-like resin composition using the same SMC manufacturing machine as in Example--, three layers of resin mixture/m' of aluminum coated glass fiber layer and then 7 top/m2 of glass cloth were simultaneously added. The sandwiched resin composition (SM'
C-1) was prepared and subjected to thickening treatment.

SMC-4 was placed so that the glass cloth side was in contact with the bottom surface of Venus, and the SMC-j prepared in Example 1 was placed on top of it, compression molded, and the radio wave reflection characteristics of the flat sample were measured.

Example A glass cloth, SMC-5 obtained in Example 3, and SMC-j obtained in Example 3 were sequentially stacked on a mold and compression molded, and the radio wave reflection characteristics of the flat sample were measured.

Example S In the process of creating the SMG-da of Example--, instead of the aluminum-coated glass fiber, a carbon fiber mat of gol/m2 (Kureha e-veil mat V-Coasp: Kureha Chemical Industry Co., Ltd.) was sandwiched. Sheet-shaped resin composition (SMC
-4) was prepared and subjected to thickening treatment.

Glass cloth was placed on the mold, sMC-A was layered on top of the glass cloth so that the carbon fiber mat surface was in contact with the glass cloth, and SMC'-3 obtained in Example 1 was layered on top of that and compression molded to form a flat plate. The radio wave reflection characteristics of the sample were measured.

Example 6 Example 308MC-! In the process of creating R, a sheet-like resin composition (S
MC-7) was prepared and subjected to thickening treatment.

SMC-7 was placed so that the glass cloth surface was in contact with the bottom of the mold, 5M0-3 obtained in Example 1 was placed on top of it, compression molded, and the radio wave reflection characteristics of the flat sample were measured.

Comparative Example 1 In Example 2, except for the glass cloth, 3M0-1
' and SMC-J's sheet-shaped resin composition only.
, when compression molded into a flat plate of cm x Ocm, SM
When the charged area of C-1 was /7cmX/7cm, the charged area was subtracted (waving of the conductive layer was observed around the molded product. Also, the charged area of SMO was /?cmX/9cm).
In this case, the surface of the molded plate on the conductive layer side was not smooth.

During the compression molding of Comparative Example and Example D, a sheet of SMC-J obtained in Example J was further stacked on the glass cloth side and compression molded, and the radio wave reflection characteristics of the flat sample were measured. The distance from the molding surface on the glass cloth layer side of this molded plate to the conductive fiber layer surface was 2 mm.

Claims (1)

[Claims] l A three-layer fiber comprising a glass fiber layer (71) mainly consisting of short fibers and a conductive fiber layer (B) as an intermediate layer between a glass fiber layer (C) made of long fibers. A thermosetting resin molded product obtained by impregnating a layer with a resin mixture containing an unsaturated polyester resin as the main resin component and integrally molding and curing the product,
) A thermosetting resin molded product characterized in that a conductive fiber layer (surface) is provided at a position Q, / −/, 0, mm from the molded surface on the layer side. U Conductive fiber layer (B) The molded article according to claim 1, wherein the surface metalized glass fiber is a glass fiber coated with aluminum. 3. The molded article according to claim 1, wherein the surface metalized glass fiber is a glass fiber coated with aluminum. The molded article according to claim n, paragraph 1, wherein the fiber layer (B) is carbon fiber.S: A resin mixture containing an unsaturated polyester resin as a main resin component in a glass fiber layer (support) mainly composed of short fibers. A resin mixture containing an unsaturated polyester resin as the main resin component is impregnated into the conductive fiber layer CB) between the thermosetting resin composition for molding obtained by impregnating the resin composition with the long fiber glass fiber layer IC). The resulting thermosetting resin composition for molding is sandwiched between the molding resin compositions and molded and cured together, and the molding surface on the layer (C) side has a 0. A method for producing a thermosetting resin molded article, characterized in that the surface of the conductive fiber layer (B) is provided at a position of /~I', Omm. B. The manufacturing method according to claim S, wherein the conductive fiber layer (B) is surface metalized glass fiber. ? 7. The manufacturing method according to claim 6, wherein the surface metallized glass fiber is a glass fiber coated with aluminum. g. The manufacturing method according to claim 5, wherein the conductive fiber layer (9) is carbon fiber. A thermosetting material for molding obtained by impregnating a fiber layer consisting of a glass fiber layer mainly composed of short ma and a conductive fiber layer (B) with a resin mixture whose main resin component is unsaturated polyester resin. A long fiber glass fiber layer (r5) is provided on the (B) layer side of the resin composition, and is integrally molded and cured, and conductive at a position of Q, / - /, Omm from the molded surface on the (C) layer side. A method for manufacturing a thermosetting resin molded product, characterized in that the surface of the conductive fiber layer (E) is provided. 10. Claim 9, wherein the conductive fiber layer (B) is surface metalized glass fiber. The manufacturing method according to claim 1, wherein the surface metallized glass fiber is a glass fiber coated with aluminum. The manufacturing method of item 9. 13 A conductive fiber layer CB is used as an intermediate layer between the glass fiber layer mainly composed of short fibers and the glass fiber layer (C) made of long fibers.
) A thermosetting resin composition for molding obtained by impregnating a fiber layer consisting of 8 layers with a resin mixture containing unsaturated polyester as the main resin component is integrally molded and cured, and (C) layer side A method for producing a thermosetting resin molded article, characterized in that the surface of the conductive fiber layer (B) is provided at a position of 0.1 to 7.0 mm from the molding surface. 14. The manufacturing method according to claim 13, wherein the conductive fiber layer) is surface-metallized glass fiber. The manufacturing method according to claim 1, wherein the surface metallized glass fiber is a glass fiber coated with aluminum. 16. A manufacturing method described in Claim FIB Paragraph 73, wherein the conductive fiber layer) is carbon fiber. 17 Conductive fiber layer (B) as an intermediate layer between the glass fiber layer mainly consisting of short fibers and the glass fiber layer (C) consisting of long fibers.
A long fiber glass fiber layer+D is provided on the (C) layer side of the thermosetting resin composition for molding obtained by impregnating a three-layer fiber layer with a resin mixture containing an unsaturated polyester resin as the main resin component. ) is formed and cured integrally, and a surface of Oo-~/, (of the conductive fiber layer) is provided at a position of 7 mm from the molded surface on the <03 layer side. A method for manufacturing resin molded products. /& The manufacturing method according to claim 11, wherein the conductive fiber layer (B) is surface metalized glass fiber. 79. The manufacturing method according to claim 1g, wherein the surface metallized glass fiber is aluminum-coated glass fiber. The manufacturing method according to claim 1'1, wherein the conductive fiber layer (B) is carbon fiber.