JPH0414205Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is a sheet-shaped sheet made of a high specific gravity inorganic powder mainly composed of iron-based inorganic powder and an ethylene-vinyl acetate copolymer resin, with a nonwoven fabric integrated on at least one side of the sheet. This invention relates to a composite wood plate-like material with excellent vibration damping, sound insulation, and heat insulation properties, which is made by laminating wood and wood boards.

Currently, there is a need for materials that are inexpensive, easy to process, and have excellent vibration-damping and sound-insulating properties in order to reduce or prevent vibrations and noise generated in housing complexes such as condominiums and apartment buildings, and department store buildings.

An object of the present invention is to meet such needs and provide a material that suppresses the vibration and noise of the binding.

As a result of many studies, the inventors of the present invention found that a non-woven fabric was applied to at least one side of a sheet-like material consisting of 40 to 94% by weight of iron-based inorganic powder and 6 to 30% by weight of ethylene-vinyl acetate copolymer resin. It has been discovered that a structural material that is a composite of an integrated sheet-like material and a wood-based board has excellent vibration damping properties, sound insulation properties, and fireproofing properties.

In the sheet-like material that constitutes the present invention,
The emulsion binder is suitably used for ethylene-vinyl acetate copolymer resins and the like.
Ethylene or vinyl acetate homopolymers cannot be balanced coagulants;
It is the first vinyl acetate copolymer to exhibit comparable flexibility, tensile strength, elongation, elastic modulus, water resistance, and good adhesion to particles, making it an excellent coagulant.
Ethylene acts as an intramolecular plasticizer for vinyl acetate homopolymers.

The composition range of a copolymer exhibiting such properties is a vinyl acetate content of 55% to 92% by weight. If the ethylene content is too high, the copolymer will have low polarity and will not exhibit adhesive strength with particles. If the ethylene content is too low, the copolymer's glass transition point cannot be lowered;
Toughness and flexibility at low temperatures cannot be obtained. Furthermore, in order to impart weather resistance, water resistance, and alkali resistance, modified ethylene-vinyl acetate resins, which are copolymerized with one or more of acrylic acid, acrylic esters, maleic esters, and vinyl versatate, are also preferably used. It is included in the invention.

The iron-based high specific gravity inorganic powder used in this invention includes iron oxide (FeO), diiron trioxide (Fe ₂ O ₃ ),
Triiron tetroxide (Fe ₃ O ₄ ), iron hydroxide (Fe(OH)n・
The main components are iron oxyhydroxide (HFeO ₂ / nH ₂ O), and some impurities such as silica _and alumina are included. Homogeneous particles have a moderate particle size distribution with a true specific gravity of about 2.5 to 5.5. Examples include high specific gravity inorganic powders with Such powders include iron-based powders, iron ore powders, by-product ferrites, etc. that are produced as by-products during the refining of various non-ferrous metals. Examples of smelting by-product iron-based powder include by-product iron-based powder during copper smelting, by-product iron-based powder during tin smelting, and by-product diiron trioxide powder during aluminum smelting. can. Examples of iron ore powder include magnetite powder (FeO, Fe ₂ O ₃ ), hematite powder (Fe ₂ O ₃ ), limonite powder (Fe(OH)n·nH ₂ O,
HFeO ₂ .nH ₂ O) can be exemplified. The iron content is preferably 40% by weight or more. The iron-based high-density inorganic powder is the main component of the sheet material of the present invention, and accounts for 40 to 94% by weight.

Furthermore, it is also possible to add 35% by weight or less of mica (scaly powder) to increase sound insulation and vibration properties. The sheet of this invention is made by condensing a large amount of high-density inorganic powder with a small amount of resin, and has excellent fire retardant properties. It is also possible to add aluminum oxide powder, dihydrate gypsum powder, etc. in an amount of 35% by weight or less.

In the present invention, in order to further improve the vibration damping and sound insulation properties of the sheet, a surface reinforcing material made of synthetic fiber nonwoven fabric is composited on at least one side of the sheet. Synthetic fiber non-woven fabrics have extremely low areal density (g/m ² )
It is preferable because it is easy to obtain a product with a small value, and there is little deterioration in the fire resistance of the sheet-like product. As for the type of nonwoven fabric, 100% polyester has excellent strength and physical properties.
Adhesion to sheet materials, dimensional stability, chemical resistance,
It is most preferable because it has good durability. It is preferable to use a nonwoven fabric with an areal density of 30 g/m ² or less so as not to reduce fireproof performance.

Next, the composition of the sheet of the present invention will be described. The proportion of the ethylene-vinyl acetate copolymer resin as a coagulant is preferably 6 to 30% by weight in the sheet. If the content is too small, the coagulation effect between powder particles will be insufficient, and the strength and physical properties of the sheet will deteriorate. Furthermore, the flowability and moldability of the water-containing mixture slurry during sheet manufacturing also become poor, making sheet manufacturing difficult.
If the content is too large, the proportion of organic content will increase and the fire resistance will also decrease. In addition, it is not possible to increase the specific gravity of the sheet, resulting in less effective vibration damping and sound insulation. Iron-based high specific gravity inorganic powder used as a filler has a solid content of 40
A range of 94% by weight is preferred.

To improve sheet strength, vinylon, nylon,
Some short fibers such as glass fibers may also be added. Furthermore, a water-soluble polymer such as carboxymethyl cellulose or epoxidized polyamide polyamine resin may be added as a viscosity adjusting agent for the slurry or a crosslinking agent for the resin. Fiber content is 0.3-10
The content of the aqueous polymer is preferably in the range of 0.5 to 5% by weight.

In order to provide even better vibration damping properties,
An effective method is to make the sheet-like material porous by foaming and drying the sheet during production, thereby increasing the thickness without changing the areal density. This method provides more than twice the vibration damping effect. To make the slurry porous, the slurry of the water-containing mixture is stirred and foamed at high speed while air is injected, the specific gravity is adjusted to an arbitrary value, and the slurry is molded and dried to obtain a sheet-like material having the desired porosity. Excessive foaming is not preferable because it results in a decrease in strength properties, a decrease in sound insulation in a high frequency range, and a decrease in compression resistance. The porosity of the sheet-like material is preferably 80% or less.

In the present invention, the sheet thickness range of the sheet-like material is 0.5 to 20 mm, and the sheet apparent specific gravity range is 0.6.
~3.5 (g/m ³ ). The sheet-like material thus obtained is flexible, highly flexible, has heat insulating properties, has good processability and handling, and is inexpensive.
Compounded with wood-based boards, it exhibits excellent vibration damping and sound insulation properties.

In the present invention, wood boards are laminated to enhance vibration damping and sound insulation effects, as well as strength and heat insulation, but in order to combine the sheet-like material and the wood boards, 1) using an adhesive; 2) Composite with adhesive. Adhesives include sodium silicate-based inorganic adhesives, polychloroprene, SBR,
General-purpose adhesives such as synthetic rubbers such as butyl rubber, thermoplastic resin adhesives such as vinyl acetate-based aqueous resin emulsions, and thermosetting resin adhesives such as phenol, urea, and epoxy are used.
As an adhesive, there is a double-sided adhesive sheet in which a base material such as paper or non-woven fabric is coated with a tackifier such as butyral resin, polyisobutylene, polyacrylonitrile, petroleum resin, etc., and the sheet-like material and a wood-based board are combined into a double-sided adhesive sheet. It is possible to bond and combine the two by adhesion.

Next, wood-based boards include natural wood decking with a thickness of 3 to 20 mm, natural wood flooring boards, wood veneer aggregates such as pre-parks, wood-based flooring materials such as wood-based composite flooring, plywood, printed plywood, overlay plywood,
This includes all wood-based board-like materials such as plywood such as natural wood decorative plywood, hardboard, and particle board.

In this way, the composite plate-like material combined with wood-based boards for general construction can be used as flooring materials for buildings such as condominiums and apartments, and as partition materials for general residences.
It has a wide range of uses as interior and exterior wall and ceiling materials.

The sheet composite wood plate-like material of the present invention can be made, for example, as follows. i.e. ethylene24
20 parts (purity: 10 parts) of ethylene-vinyl acetate copolymer emulsion with a copolymerization ratio of 70% by weight of vinyl acetate and 6% by weight of acrylic acids, 10% solution of polyvinyl alcohol as a foaming agent (degree of polymerization: 2000) , saponification degree 80 mol%) 5 parts, epoxidized polyamide polyamine 1.0 part (purity 0.3 part) as a crosslinking agent, water 9.4 parts
Mix and stir in a suitably sized container. Next, 91.1 parts of iron-based high specific gravity powder (particle size of 100 mesh pass, iron content 56%, true specific gravity 3.75, moisture content 10%) produced during copper smelting, and 8 parts of Susolite mica powder were added.
1 part, and 0.15 parts of soda carbonate as a PH regulator are gradually added and mixed with stirring. While injecting air into the water-containing mixture slurry, the slurry is stirred and foamed at high speed to reduce the specific gravity of the slurry.
Adjust to 1.3 to obtain a molding slurry. Next, the slurry for molding is coated and cast using a doctor blade with a clearance of 7.5 mm on a base sheet with good mold releasability. Next, a polyester nonwoven fabric (basis weight) is applied to the surface.
16 g/m ² ) were laminated and integrated, and dried in a hot air circulation dryer at 80° C. for 180 minutes to obtain a sheet-like material with a thickness of 7 mm, an apparent specific gravity of 1.0, and a porosity of 70%. The obtained sheet-like material is, for example, a wood flooring material of 8 mm.
By bonding the thick pre-park flooring material with an epoxy resin adhesive, it is possible to obtain the sheet composite wood board material of the present invention which has excellent vibration damping properties, sound insulation properties, fireproofing properties, and heat insulation properties.

[Brief explanation of drawings]

1 and 2 are enlarged sectional views showing the structure of the composite plate-like material of the present invention. The symbols in the figure indicate the following. 1...Sheet-like material, 2...Wood-based board, 3...Adhesive layer, 4...Nonwoven fabric.

Claims (1)

[Scope of utility model registration request] b) Ethylene-vinyl acetate copolymer containing vinyl acetate with a copolymerization ratio of 55% to 92% by weight.
~30% by weight, b) Sheet-like material 1 comprising a nonwoven fabric integrated on at least one side of a sheet containing 40 to 94% by weight of iron-based inorganic powder with an iron content of 40% by weight or more as determined by component analysis. A composite wood board-like material in which a and wood board 2 are laminated.