JP3124232B2 - Impact-resistant decorative board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0012]

BACKGROUND OF THE INVENTION The present invention relates to a decorative material comprising a thermosetting resin fiber reinforced plastic based on aramid fiber, which is a high strength fiber, impregnated or coated with a melamine resin having a high surface hardness on the front and back surfaces. The present invention relates to an impact-resistant decorative plate which is formed by coating the periphery of a plate-like molded product obtained by simultaneous molding with rubber or a soft thermoplastic resin, and which can be used as a memo table which can be carried around in a paper bag or the like. is there.

[0002]

2. Description of the Related Art As an impact-resistant plate, an aramid ACM plate obtained by stacking a predetermined number of aramid fiber substrates impregnated or coated with a polyvinyl butyral-modified phenol resin and heating and pressing the same is known. Since it is modified with polyvinyl butyral, its surface hardness is small and when it is left outside, discoloration is remarkable due to ultraviolet rays. To eliminate this defect and increase the commercial value of the molded product, it was necessary to apply the coating. In addition, there is no application to make a memo backing sheet by putting it in a bag in the main use for impact resistance, and even if it is, the resin content is reduced to improve the impact resistance, so cross-cuts of aramid fiber etc. on the surface As a result, even if the resin is slightly increased, the surface hardness is low due to the modification of polyvinyl butyral, so that when used for a memo mount, a small table, or the like, there is a defect that the smoothness is poor and the scratch is easily formed.

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a molded article comprising a polyvinyl butyral-modified phenolic resin and aramid fiber (hereinafter referred to as aramid ACM) having a high impact resistance and a surface hardness in plastic. By placing the melamine resin impregnated decorative material, which is considered to be the largest, on the surface of the aramid ACM, and by coating the peripheral end surface with a rubber-based or soft thermoplastic resin, it can be used as a memo mount or a small table. This is the completion of the impact decorative board.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a laminate comprising a predetermined number of laminated aramid fiber cloths impregnated or coated with a polyvinyl butyral-modified phenolic resin, and a decorative material impregnated or coated with a melamine resin on the front or back of the laminate. The present invention relates to an impact-resistant decorative plate, characterized in that the entire periphery of an end face of a plate-like molded product obtained by lamination molding is covered with a decorative material composed of a rubber-based or soft thermoplastic resin.

The aramid fibers used in the present invention generally fall into the category of high-strength fibers. The specific tensile strength obtained by dividing the tensile strength by the density is 10 × 10 ⁶ cm or more, and the specific modulus obtained by dividing the elastic modulus by the density is obtained. The elastic modulus is 2.5 × 10 ⁸ cm or more. If the specific tensile strength or specific elastic modulus is less than the above values, the impact resistance of aramid ACM is not always sufficient. The properties of the aramid fiber woven fabric are not particularly limited, but the driving density is 15 to 50 fibers / 25 mm, the yarn thickness is 400 to 3000 denier, and the weight is 150 to 600 g / m.
^Two are preferred.

On the other hand, as the polyvinyl butyral-modified phenol resin impregnated in the aramid fiber, a resol type phenol resin and a polyvinyl butyral resin (hereinafter, referred to as “polyvinyl butyral resin”) are usually used.
PVB) is mixed or reacted, and the ratio of both is 20 to 80 parts by weight with respect to 100 parts by weight of the former.
Parts by weight, preferably 30 to 70 parts by weight. Furthermore,
5 to 5 parts of epoxy resin per 100 parts by weight of phenol resin
In some cases, 40 parts by weight may be mixed.

The aramid fiber prepreg is obtained by impregnating or applying the above-mentioned polyvinyl butyral-modified phenol resin (hereinafter referred to as PVB-modified phenol resin) to an aramid fiber cloth and drying.

On the other hand, the melamine resin impregnated decorative material used as the surface material may be any one used for a normal melamine resin decorative plate, and the melamine resin obtained from melamine and formaldehyde is made of an inorganic material such as glass fiber. It is obtained by impregnating or coating a fiber cloth, an organic fiber cloth made of a saturated polyester resin or the like, or a paper substrate.

In order to obtain an impact-resistant decorative board, a plurality of aramid fiber prepregs are stacked, and one to three melamine resin impregnated decorative materials are stacked on the front or back of the prepreg. There is a hand lay-up method that does not make a. At this time, the content of the resin is in the range of 5 to 50% (weight%, the same applies hereinafter) in the case of aramid fiber, but is preferably 8 to 25%. If it is less than 5%, the adhesion between the prepregs will be reduced, or if it is more than 50%, it will be difficult to produce a prepreg, which will cause a reduction in impact resistance. With the hand lay-up method, those having a content of up to 70% can be molded.

On the other hand, in the case of a melamine resin impregnated decorative material, the resin content is in the range of 20 to 80%, preferably 30
~ 70%.

The plate-like molded product thus obtained is bonded with a cosmetic material (for example, an extruded molded product) made of a synthetic rubber such as neoprene or silicone or a natural thermoplastic resin such as polyvinyl chloride over the entire periphery of the end face. Cover with cosmetics, fix and make up.

The size and thickness of the impact-resistant decorative plate of the present invention are as follows in the case of an office bag such as an attache case.
Desirably, the size is B4 to A4 and the weight is around 1 kg. The thickness varies depending on the required impact resistance.
１５15 mm. If it is less than 5 mm, sufficient impact resistance cannot be obtained, and if it exceeds 15 mm, it becomes heavy and handling may be difficult.

[0013]

Next, examples and comparative examples of the present invention will be described. FIG. 1 shows a configuration example of a PVB-modified phenol resin-impregnated aramid fiber prepreg and a melamine resin-impregnated decorative material.
(1) is an aramid fiber prepreg impregnated with PVB-modified phenolic resin, and (2) is a decorative material impregnated with melamine resin. FIG. 2 is an example of the impact-resistant decorative board of the present invention, (a) is a plan view,
(B) is a side view. FIG. 3 is a sectional view taken along line AA of FIG. (3) is a melamine resin decorative layer, (4) is an end face decorative material, and (5) is an adhesive.

Example 1 Specific tensile strength 21 × 10 ⁶ c
m, aramid fiber woven fabric with a specific elastic modulus of 6.2 × 10 ⁸ cm (plain weave, thickness 0.45 mm, basis weight 460 g / m ² )
Was impregnated with a PVB-modified resol-type phenol resin, and dried to produce a prepreg impregnated with a PVB-modified phenol resin having a resin content of 15%. On the other hand, the basis weight is 120
g / m ² monochromatic kraft paper was impregnated with a normal melamine resin used for a decorative board to obtain a melamine resin impregnated decorative material having a resin content of 40%. The PVA-modified phenolic resin-impregnated aramid fiber prepreg is laminated on 18 sheets, and the melamine resin-impregnated decorative material is laminated on the front and back one by one at 145 ° C., 100
By heating and pressing at Kg / cm ² , a melamine resin aramid fiber composite molded plate was obtained. This was cut into a rectangular shape of 270 × 370 cm, and an extruded product made of neoprene rubber and having a U-shaped cross section was adhered to the entire periphery of the end surface with a rubber adhesive, as shown in FIG. An impact-resistant decorative board was obtained.

Example 2 Specific tensile strength is 24 × 10 ⁶ c
m, aramid fiber woven fabric having a specific elastic modulus of 6.6 × 10 ⁸ cm (2 × 2 basket weave, thickness 0.56 mm, basis weight 4
30 g / m ² ) was impregnated with a PVB-modified resol-type phenol resin, and dried to prepare a PVB-modified phenol resin-impregnated aramid fiber prepreg having a resin content of 20%. on the other hand,
A colored high-strength polyester nonwoven fabric having a basis weight of 60 g / m ² was impregnated with a normal melamine resin used for a decorative board to obtain a melamine resin impregnated decorative material having a resin content of 40%. The above P
19 pieces of aramid fiber prepreg impregnated with VB modified phenolic resin, and two pieces of melamine resin impregnated cosmetic material on the front and back, 270 (vertical) x 370 (horizontal) x 1
Put in a flat plate mold of 0mm (thickness), 145 ° C, 10Kg
/ Cm ² to obtain a melamine resin aramid fiber composite molded plate. After taking this out and removing the burr,
An extruded product made of soft polyvinyl chloride and having a U-shaped cross section was adhered to the entire periphery of the end surface with a polyvinyl chloride adhesive to obtain an impact-resistant decorative plate as shown in FIG.

Example 3 Specific tensile strength is 24 × 10 ⁶ c
m, aramid fiber woven fabric having a specific elastic modulus of 6.6 × 10 ⁸ cm (2 × 2 basket weave, thickness 0.56 mm, basis weight 4
30 g / m ² ) was impregnated with a PVB-modified resol-type phenol resin, and dried to prepare a PVB-modified phenol resin-impregnated aramid fiber prepreg having a resin content of 20%. on the other hand,
Kraft paper on which letters and the like having a basis weight of 130 g / m ² were printed was impregnated with a normal melamine resin used for a decorative board to obtain a melamine resin impregnated decorative material having a resin content of 50%. PVB above
Aramid fiber prepreg impregnated with modified phenolic resin
The melamine resin impregnated decorative material is superposed one by one on the front and back, and 270 (vertical) x 370 (arc) x 10 mm
(Thickness) placed in a mold with a quadratic curved surface at 145 ° C,
By heating and pressing at 100 kg / cm ² , a melamine resin aramid fiber composite molded plate as shown in FIG. 4 was obtained. After deburring the end face, it was decorated with a polyvinyl chloride sheet to obtain a curved impact-resistant decorative board. In FIG. 4, (6) is an aramid fiber layer impregnated with a PVB-modified phenolic resin,
(7) is a melamine resin-impregnated polyester nonwoven fabric layer.

The impact-resistant decorative board thus obtained is
Not only has excellent impact resistance, but the surface is made of melamine resin and the entire circumference of the end face is made of rubber or soft thermoplastic resin, so it is beautiful, high surface hardness, miniaturized and miniature It can be used as a table, a memorandum, etc.

[0018]

The impact-resistant decorative sheet of the present invention is made of a high-strength aramid fiber-based thermosetting resin fiber-reinforced plastic and a melamine resin-impregnated decorative material. It can be used as a decorative board, and can be used as a memo pad or the like that can be miniaturized and carried in a document bag or the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration example of a PVB-modified phenol resin-impregnated aramid fiber prepreg and a melamine resin-impregnated decorative material.

FIG. 2 is an example of the impact-resistant decorative board of the present invention, wherein (a)
Is a plan view, and (b) is a side view.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view of a composite molded plate for forming a curved impact-resistant decorative plate which is an example of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 PVB modified phenolic resin impregnated aramid fiber prepreg 2 Melamine resin impregnated decorative material 3 Melamine resin decorative layer 4 End face decorative material 5 Adhesive 6 PVB modified phenolic resin impregnated aramid fiber layer 7 Melamine resin impregnated polyester nonwoven fabric layer

Continuation of front page (56) References JP-A-7-117164 (JP, A) JP-A-6-305076 (JP, A) JP-A-1-283141 (JP, A) JP-A-1-241438 (JP) JP-A-60-176758 (JP, A) JP-A-60-48342 (JP, A) JP-A-59-20327 (JP, A) JP-A-1-77543 (JP, U) 40-12177 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00

Claims (1)

(57) [Claims] 1. A predetermined number of aramid fiber cloths impregnated or coated with a polyvinyl butyral-modified phenol resin,
A melamine resin-impregnated or coated decorative material is superposed on the front and back surfaces, and the entire periphery of the end face of the plate-like molded product obtained by laminating and molding is covered with a decorative material made of a rubber-based or soft thermoplastic resin. And shock-resistant decorative board.