JPH01169498A - Sound-proof and shielding material - Google Patents

Abstract

PURPOSE:To eliminate generation of a bank and to prevent flawing of the surface of a sheet forming roll by mixing manganese ferrite which is MnFe2O4 in the form of the main compd., thermoplastic resin or natural and synthetic resin, etc., and forming the mixture to a sheet of a suitable thickness. CONSTITUTION:The manganese ferrite which is MnFe2O4 in the form of the main compd., the thermoplastic resin or the natural and synethetic rubber, etc., are mixed and the mixture is formed to the sheet of the suitable thickness. The manganese ferrite to be mixed with the thermoplastic resin or the natural and synthetic rubber, etc., has the high sp. gr. of the compd. itself and an a sound-proof, vibration-proof and sound-shielding effect and has no toxicity; therefore, said ferrite has no adverse influence on the human body and since the grain size thereof is small, the ferrite can be easily mixed with the thermoplastic resin, etc., and the incorporation hereof at a high ratio is possible; in addition, the mixed state in which said ferrite is uniformly mixed is obtd. Generation of the bank of the manganese ferrite at the time of molding the sheet is thereby obviated and the surface flaw of the sheet molding roll is prevented.

Description

[Detailed description of the invention] [Industrial application field] This invention is suitable for general housing, etc. Firefly walls and windows.

Machines that make noise when applied to floors, etc.
Soundproofing, vibrationproofing, etc. can be achieved by coating air conditioning ducts, etc.
Related to soundproofing and soundproofing materials with excellent soundproofing properties.

[Conventional technology] Conventionally, thermoplastic synthetic resins or natural/synthetic resins have been used as soundproofing/soundproofing materials installed for soundproofing, vibrationproofing, and noise insulation in buildings such as general houses, noisy machines, air conditioning ducts, etc. It is commercially available in sheets made by mixing granules of lead, iron, sand, etc., and inorganic granules of similar density, such as cotton, with rubber etc.

[Problems to be solved by the invention] The conventional sheet-shaped insulation/sound insulation material mixes particles of lead, iron, sand, etc., cotton, etc. with thermoplastic synthetic resin. If the mixture is lead, there is a risk of lead apricots being produced in the human body, and if the mixture is made of granules such as iron or sand, the particle size is large and the specific gravity varies widely.

If you try to combine a large amount of sand, the thickness of the Ikioi sheet will increase, and it will also be difficult to mix it in a uniformly dispersed state within the sheet, resulting in uneven soundproofing and soundproofing effects. There are problems such as salt damage when mixed with iron powder, rust when iron powder is used, and lead and iron during manufacturing.

There are problems such as damage to the surface of the sheet forming roll due to mixtures such as sand.

This invention aims to solve the above problems.
It provides sound insulation material.

[Means for Solving the Problems] In order to solve the above problems, the present invention combines manganese ferrite whose main compound is M n Fe * Oa with thermoplastic synthetic resin or natural/synthetic rubber. The mixture was mixed and formed into a sheet of appropriate thickness.

[Residential use] Manganese ferrite, which is mixed with thermoplastic synthetic resin or natural/synthetic rubber, has a high specific gravity and has soundproofing, vibrationproofing, and soundproofing effects, and is nontoxic, so it does not cause any harmful effects on the human body. Since the particle size is small, it is easy to mix with thermoplastic synthetic resins, etc., and it is possible to mix a large amount, and a uniformly dispersed mixed state can be obtained. There is no risk of damage to the surface of the sheet forming roll.

[Example] Examples of the soundproofing/soundproofing material according to the present invention will be described below.

In this invention, manganese ferrite whose main compound is MnFemOa is mixed with thermoplastic synthetic resin or natural/synthetic rubber, and the mixture is formed into a sheet of appropriate thickness.

The main compound of the manganese 2-elite used in this invention is represented by MnFem0a, and its chemical components include MnO from 20 to aoex, Fe*Os to 2
5-50%, Sin, 5-25%, AlsOs
It is preferable to have a specific gravity of 3 to 15% and a small amount of other M9c and CaO, with a specific gravity of 3°0 to 4.09/l, and a particle size distribution in the range of 2μ to 50μ. is preferred.

This manganese ferrite is mixed with thermoplastic synthetic 1M4 resin or natural/synthetic rubber, but among such materials, polyvinyl chloride resin is particularly preferred because it is inexpensive and can be molded with a low specific gravity. It is easy to prepare and can be mixed with a large amount of manganese ferrite. In addition, an appropriate amount of other synthetic resin may be used in combination with the polychloride and the Neil resin.

In addition, if necessary, in addition to manganese ferrite alone, other metal particles with high specific gravity that do not affect the human body (human body) may be used together. However, the amount of such other metal particles used is limited. It is necessary to use a smaller amount than that of manganese ferrite.The reason is that if the amount used is larger than that of manganese ferrite, workability and uniform dispersibility will deteriorate and the cost will also increase.

Furthermore, if necessary, plasticizers, stabilizers, auxiliary agents called retardants, and aluminum hydroxide for nonflammability are added.
Magnesium hydroxide may be added as an additive.

However, the ss weight of any thermoplastic synthetic resin, natural/synthetic rubber, and additives added thereto is manganese ferrite alone or manganese ferrite and other metal particles used in combination with it, in terms of the weight ratio per total volume. It is preferable not to exceed the weight of

This invention involves mixing the above manganese ferrite with a thermoplastic synthetic resin, and adding other additives I as necessary.
B: Added and molded into a sheet of appropriate thickness.

There are no particular limitations on the means for forming the sheet, but in the examples a calender rolling method is used.

In this example, manganese ferrite...200-3
00 parts, polyvinyl chloride resin...50 to 70 parts, plasticizer...50 to 70 parts, others; 6 additives...20 to
The mixture was mixed in proportions ranging from 30 parts to form a sheet with a thickness of 1.2 m/e. The m member of M2 of this sheet was 2.1 or more than 9.

The above sheets can be used as partitions and curtains in general homes.

External noise from airplanes, trains, zero-mobility forces, etc., internal sounds from pianos, etc., the sound of impact noises applied to the floor from upstairs that propagate to the downstairs, gas flow noise generated from inside air conditioning ducts, etc. Sound transmission loss (JIS-1416) was used to measure circulation noise generated in water and sewage pipes, machine tools, and other 11 machines, and the results were 1251-128 (dB) or more and 500H215 (dB) or more. .

2000H224 (dB) or more The results were obtained.

As shown in Figure 1, the sheet-like insulation/sound insulation material according to the present invention obtained as described above is coated with a fabric made of inorganic, organic, or a mixture thereof, such as glass cloth, on the front, back, or both sides. A noncombustible sheet made of cloth or nonwoven fabric, aluminum foil, or foamed plastic foam may be laminated and integrated.

Layering noncombustible sheets or aluminum foil on a sheet-like soundproofing/soundproofing material can promote noncombustibility, and layering foamed plastic foam can also reduce solid-borne sound by utilizing the difference in vibration coefficient of each material. The absorption effect can be improved.

In the figure, 1 is a sheet-like soundproofing/soundproofing material according to the present invention, 2 is a noncombustible sheet, 3 is an aluminum foil, and 4 is a foamed plastic sheet.

[Effects of the Invention] As described above, the soundproofing/soundproofing material according to the present invention is produced by mixing manganese ferrite whose main compound is MnFe2O4, thermoplastic synthetic resin acid 1, natural/synthetic rubber, etc. to an appropriate thickness. Since manganese ferrite is mixed with thermoplastic synthetic resin or natural/synthetic rubber, this compound itself has a high specific gravity and has soundproofing, vibrationproofing, and soundproofing effects, and is also non-toxic. It has no harmful effects on the human body, and its small particle size makes it easy to mix with thermoplastic synthetic resins. Furthermore, since there is no puncture of the manganese ferrite during sheet forming, there is no risk of damaging the surface of the sheet forming roll, and there is an effect that the sheet forming roll can be obtained at a lower cost.

[Brief explanation of the drawing]

Figures M1 to M3 are cross-sectional views showing an example of an embodiment of the present invention. 1...Sheet-like insulation/soundproofing material

Claims (1)

[Claims] A soundproofing/soundproofing material made by mixing manganese ferrite whose main compound is MnFe_2O_4 with thermoplastic synthetic resin or natural/synthetic rubber and forming it into a sheet of appropriate thickness.