JPS5990205A - Plate material for acoustic equipment - Google Patents

Abstract

PURPOSE:To obtain a plate which has an improved elastic modulus and large internal loss by providing a plate material layer of a short molding compound containing glass chopped strands over surfaces of a plate material for acoustic equipment which is molded out of a resin composition containing a fiber reinforcing material etc. CONSTITUTION:The plate material A for acoustic equipment such as a speaker box contains thermosetting resin such as unsaturated polyester, an inorganic filler of CaCO3, BaSO4, etc., a hardner, and a reinforcing organic fiber of vinylon, polyester, etc., or inorganic fiber such as glass fiber and carbon fiber. Layers B and B' which uses the short molding compound which contains 50- 70% glass chopped strands are laminated on at least one surface of the plate material A, e.g. the top and bottom surfaces. Thus, the plate material which has large density and rigidity and improved acoustic characteristics with superior oscillation damping effect is obtained.

Description

[Detailed description of the invention] The unexploded IJJ is suitable for sound 'J (discipline board f'), 11" record player gee V vignette, speaker box board, It is Itari.

tf '14'
Plywood, aluminum Uno die, etc. are used, but wood is used.
Also, although the aluminum Uno Dar f-Y Yast has less vibration, it has less internal loss and poor damping effect9, and its vibrations are easily transmitted and do not damp quickly.

By the way, in order to overcome the above-mentioned drawbacks of the board for audio equipment, a composite side made of plastic mixed with an inorganic filler has been used in recent years, but even with this composite side, the acoustic characteristics have improved. The internal loss is inferior to that of wooden boards and plywood, and the internal loss is large (therefore, there is a long-awaited development of a board for audio equipment that has a high damping effect, high density, and rigidity r).

The inventiveness is the above-mentioned composite side, disadvantage 7 of pine wood using unsaturated 11th polyester resin as plastics.
This is an improved version with improved elasticity (that is, less elasticity and less vibration) for the acoustic machine 'i!'4. Thermosetting 4i>, 1 fat, inorganic 7it filler I agent, hardening agent, and fiber reinforcing agent-free resin composition! , and the plate layer (03) and (Tf) layer formed by molding using a sheet molding compound that meets glass chiyono dastra / doke in both of them → 7
't! It is a board for equipment.

Layer (5) regarding "misfire" is for f-sound equipment and (~
It is sufficient to use the conventionally known method 2'L.

Therefore, the following are exemplified as the components of the resin composition for molding of (5) No. 1.

Preferred thermosetting resins include unsaturated polyester resins, ebogi resins, phenol resins, etc. Particularly preferred are unsaturated polyester resins. Ran. Furthermore, in addition to thermosetting 1' (White-1 resin), thermoplastic I1 resin (T, F-4-1F:, polyethylene, Boristyrene/, vinyl acetate/R, etc.) γ may be added.

If the filler is γ', e'1, for example, barium sulfate, carbonate or the like, the ratio JJt is 1.
．． It is best to be able to place the number 9 to 2.2.

To the fiber, as for jL reinforcement, use t or glass or hl<#:l
fl, inorganic fibers such as carbon fibers, polyester fibers, vinylon fibers, fl, etc. 131J"iJ t'L includes baroside, dicumyl baroside, etc. In the resin composition, known pigments, low shrinkage agents, and mold release agents (e.g., zinc stearate) are further added. ), etc. are mixed.○ The resin composition is usually mixed with IJ and then molded with a kneader.

Specific examples of the composition of layer (5) include the following.

Fuku No. 11 Borienuteru 117J JJFj
107i, :ij'r1i15(s-Pikar719
5; Boristileno manufactured by Nippon Yubika Co., Ltd.
3 oki, jl) Sound IS styrene monomer - 3 oil quantity Pennzoyl peroxide 05 heavy 11 parts Zinc stearate 1 (] heavy I, 11 η 15 charcoal step calcium 40.0 heavy version parts Barium sulfate 40.0 units h1 sound I9 bi =
o 7 fiber 3,0 weight”If,
' ll (glass not L1 no Kdl:
10.0 heavy fil: General sheet mold ink combination/de (S IV
IC) is 50-70% glass chopped strands.
It contains a large amount of Q↓i as other ingredients.
jJ~Curing ↑l:, 4M↑fat (preferably unsaturated polyester 4 and 11), monomer (preferably styrene mono 7-), low shrinkage agent, a small amount of inorganic 1i1 as filler (
Good 1 shi < Q1 charcoal [! Use one that contains calcium and other ingredients. 4C to commercially available S"-teQ; 12, lt
Mc' (Jinichi Ink Chemistry 41. 'Ji!' is included.Hereinafter, 1ift and light-T are shown according to the drawings.

814, Figure i, 1, This is an example of this di3 bright plate side, (1) is (5) layer, (2) foil I3) layer, (3) &
:J, (11) layer.

Misfire 1'' 1. For example, (5) above and below the 4th layer plate 03) layer and (8 rV 1.C' of the stratum corneum [method of direct pressure molding using a mold or C1 ,-t;n,zo1
1-The (5) layer, the (3) layer and the (13) layer plate material are formed by a known method, and then the adhesive 71', T or the like is applied to the material. ↓1?It will be created.

00 layer and (+() layer 1.+Regret is 721 respectively 1~5(
9) m1 preferably 7<d 1.2 to 4, JC+ of (A) layer
'Mo)j trace' 5 ''-20111Jrl, <+17
~12 open.

The uninvented board shape is a dexterous board material, with a large 71゛) degree, a high stiffness, a large internal loss, and a 1" total I! (! I (p) 1st month (
I have listed i as A.

[Brief explanation of the drawing]

Figure 1 is a perspective view of one embodiment of the uninvented board material.

Claims (1)

[Claims] A resin composition containing a thermosetting 41'tJ resin, an inorganic filler, a curing agent, and a fibrous reinforcing agent. Glass chopped strands on at least one side of the molded audio equipment board side? Acoustic S (several layers of board 4
'l'.