JPS60103064A - Manufacture of soundproof material containing recollected ferrite - 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 The present invention utilizes industrial waste. This invention relates to a method for producing soundproofing materials with excellent soundproofing and vibration damping properties.

More specifically, the recovered ferrite powder obtained through the process of collecting harmful metals contained in wastewater is used as a sound insulation and vibration damping material containing 100 to 1400 parts by weight per 100 parts by weight of synthetic resin or rubber. This invention relates to a method for manufacturing a new, inexpensive sheet-like or plate-like soundproofing material that is easy to mold, has excellent handling properties during construction, and has excellent durability.

Traditionally, to prevent noise, acoustic materials, sound absorbing materials,
Vibration damping materials, etc. are used, and as sound insulating materials, materials with a high areal density (KfIC per unit area) are effective.For example, a synthetic material with a high specific gravity filler added to multi-H. Resin composites etc. are used. On the other hand, it is also known that a composite material containing a matrix synthetic resin or rubber having a transition temperature near the temperature at which it is used and a scale-like filler is effective as a vibration damping material.

However, although many of these conventional products have excellent sound insulation and vibration damping properties, they lack ease of handling and durability during construction, and require special materials to satisfy all requirements as building and industrial materials. It is expensive and not commonly used because it requires sophisticated raw materials and manufacturing methods.

On the other hand, in recent years, in order to prevent harmful heavy metal pollution, technology for repairing metals has been greatly developed and various plants have been developed. , and that technology should be put to good use.

In view of the current situation, the present inventors utilize industrial waste,
As a result of extensive research in order to develop soundproofing materials that are both excellent and inexpensive and can prevent noise, we have discovered that harmful heavy metals, which are precipitates obtained by a method for removing heavy metal ions from wastewater, commonly known as the ferrite method, have been developed. 100 to 1,400 parts by weight of recovered ferrite, which consists of a precipitate that has absorbed heavy metal ions obtained by adding ferrous ions and an alkaline substance to the contained wastewater, per 100 parts by weight of emulsion-like synthetic resin or rubber. By molding the composition containing 30% of the total amount into a sheet or plate shape, we can create an inexpensive and novel product that has excellent sound insulation and damping properties, is easy to mold, and has excellent handling and durability during construction. The present invention was achieved by discovering that it is possible to produce a soundproofing material.

- The above excellent properties cannot be easily inferred from ferrite, which is used as a magnetic material in other countries, but can only be achieved by using emulsion-like synthetic resin or rubber and recovered ferrite. It is.

Next, the constituent elements of the present invention will be explained specifically and in detail.

The recovered ferrite used in the present invention includes, for example, ferrite powder recovered by a method for removing harmful metals from wastewater described in JP-A-49-83257, the main component of which is magnetite ( Fea04) + iron oxyhydroxide (FeOOH), and iron trioxide (Fe2
0g) and a solid solution of detoxified gold J12 compound.

The particle size and particle size distribution of the recovered 7-elite used in the present invention vary depending on the type of synthetic resin or rubber used as the matrix and the molding method, but in general, the size of the primary particles is 10 μm or less, and the particle size distribution is A material with a wider diameter is preferable in that it is easier to form, can be filled with a higher degree, and has a higher degree of sound insulation and vibration damping properties.

The higher the true specific gravity of the powder, the better, but generally it is 4.5.
~5.5 is preferable. If necessary, it is also possible to surface-treat the powder with a suitable substance for the purpose of improving moldability.

It is assumed that this is because the recovered ferrite used in the present invention incorporates various heavy metals contained in wastewater, and the chemically active sites of the ferrite particles are blocked by these heavy metals. It is thought that it is possible to produce a soundproofing material with excellent sound insulation and vibration damping properties since it does not cause much deterioration of the matrix synthetic resin or rubber, and therefore it is possible to contain a large amount of recovered 7-elite.

On the other hand, soundproofing materials manufactured by filling ferrite, which is commonly used as a magnetic 7 material, may be because the chemically active sites of the 7 ferrite particles are not shielded, and the ferrite is dispersed in synthetic resin or rubber. Its properties are inferior to recovered ferrite, and its sound insulation properties are excellent over a long period of time.
It is difficult to maintain vibration damping properties and is inferior in durability, making it unsuitable as a filler for soundproofing materials.

Furthermore, compared to lead and iron powder, which have traditionally been used as fillers for sound insulation materials, recovered ferrite particles have a smaller true specific gravity, so they are inferior in terms of sound insulation effect at the same filling rate. Matrix Synthesis' Since it is possible to contain a large amount in a resin or rubber, it is possible to achieve a sound insulation effect equal to or better than that obtained by using the above-mentioned fillers. It is excellent in that it is easy to handle during construction because it does not deteriorate, and is also harmless and inexpensive.

Moreover, since the recovered ferrite used in the present invention contains some water immediately after recovery, there is no risk of dust explosion even if it is stored as is, and the powder itself is easy to handle. If you follow the soundproofing method using reeds and emulsion-like synthetic resin or rubber, which will be described later,
There is no problem with this amount of water contained. The synthetic resin and rubber used in the present invention are of a water-based emulsion type. Vinyl chloride polymers, synthetic resins and coams that can be filled with recovered ferrite in a polyphonic manner and have high sound insulation and vibration damping properties.
Ethylene-vinyl acetate co-a combination, natural rubber, isoprene rubber.

Among these, ethylene-vinyl acetate copolymers are preferred because they have excellent durability, perhaps because they have good adhesion to recovered ferrite.

Recovered ferrite is preferred for synthetic resins or rubber.

In other words, if the mixing ratio of recovered ferrite is less than 100 parts by weight, the manufactured soundproofing material cannot be expected to have a high specific gravity, the sound insulation properties and vibration damping properties are not as good, and the effect of adding recovered ferrite is difficult to appear. If the mixing ratio of recovered ferrite increases to 1400'211<if part, the sound insulation properties and vibration damping properties will not be improved any further, and the addition effect will not increase even further, and during manufacturing, it will not be uniform with the synthetic resin or rubber. It is not easy to mix into the soundproofing material, and furthermore, the mechanical properties of the manufactured soundproofing material are deteriorated.

In order to manufacture the soundproof insulation according to the present invention, it is possible to select any of the known manufacturing techniques.

For example, in the case of synthetic resin or rubber that is swallowed in the form of an emulsion, synthetic resin/recovered ferrite or rubber/recovered 7
It is possible to produce soundproofing materials through a process in which the engineered light composition is formed into a sheet or plate shape, either alone or together with a reinforcing base material if necessary, dried, and further heat-treated if necessary. It is. At this time, add a plasticizer if necessary.

It is possible to add crosslinking agents, surfactants, thickeners, water repellents, pigments, etc.

In addition, by using scale-like inorganic powder such as silica, mica, graphite, vermiculite, melk, clay, etc. together with metal powder, it is also possible to provide even higher sound insulation and vibration damping properties. The sheet-like or plate-like soundproofing material obtained by the present invention can be used in its original form or after secondary processing as partition members and soundproofing walls in factories, workshops, vehicles, ships, and automobiles.

It can be used as a component of equipment, machinery, etc., or it can be pasted on the surface of a structural component, or it can be pasted on a metal plate, plywood, or plasterboard, or it can be sandwiched between them. By creating a sandwiched three-layer structure, it is possible to exhibit sound insulation or vibration damping effects and reduce noise.

Furthermore, it can be layered with sound-absorbing materials such as glass cool, rock wool, and foamed resin to achieve sound-absorbing properties.

It is also possible to use it as a soundproof material that has both sound insulation and vibration damping properties.

As described above, according to the present invention, a sheet-like or plate-like soundproofing material that has highly durable soundproofing and vibration damping properties while effectively reusing industrial waste that has conventionally been disposed of in landfills etc. It becomes possible to manufacture materials.

EXAMPLES The present invention will be specifically explained below with reference to Example R, but the present invention is not limited in any way by the following Examples.

[Example 1, Comparison 911A] The composition shown in Table 1 was stirred and mixed uniformly to form a slurry, then formed into a sheet by a doctor blade method, and immediately dried at t4100°C [1, A molded product was obtained.

Heat the sheet-shaped molded product to 150°C for 1 hour → bring it to room temperature for j hours →
By repeating the operation of leaving at -30°C for 1 hour (3 hours cycle), the mechanical properties and sound insulation properties of each cycle were improved.
Measure vibration damping properties and combine these results to determine 1iil
Determine the durability and 7ξ.

As is clear from the Examples and Comparative Example A in Table 1, sheet-like molded products using recovered ferrite showed little deterioration in mechanical properties, sound insulation properties, and vibration damping properties in cycle tests, and had good +mI durability. Demeru.

(51) 1lal 7 gills (HNi + Cu
Add ferrous ions and an alkaline substance equivalent to 50 times the number of moles of lion to the total sulfur metal containing IH and ZH elements, and oxidize the ferrous ions by blowing in oxidizing gas. A solid solution of metal oxides (ratio, i
5. o, moisture content "0") was used.

(Note 2) Manufactured by Toda Kogyo Q), GP-300 (barium ferrite commercially available for use in comb magnets) (Note 3) Ethylene-vinyl acetate co-Tit combined emulsion: ■ Manufactured by Kuraray, Hanflex Examples and comparative examples Deno(nflex 0M-5
01050 heavy view part and) Kunflex 0M-7000
100 parts by weight of the 50 parts by weight mixture was used.

(Note 4) Sumitomo Resin 650-30; Sumitomo Chemical ■ (Note 5) Sound insulation performance; Made of concrete with a thickness of approximately 2 crn (30 an x 30 tm x 30 c
Place a speaker in the box, connect an oscillator to it, place a sound level meter at a position 6 crn from the box, and set 1/3 to this.
Attach the octave analyzer and recorder. One side of the box was left open with a 15cm x 15cm ripple, and a test piece (20cm x 20cm) was glued to this area.
Always emit a sound of the same loudness at each frequency from a speaker, and measure the loudness of the sound passing through the test piece by 1llll.
Determine J. Table 1 shows the l when producing the sound of 9ociH.
The magnitude of the passing sound at 000 Hz is expressed as the difference from 90 d33. It can be said that the larger this value is, the greater the shielding performance is.

(Note 6) Vibration damping performance; thickness of 30tx3cm,
A test piece is glued to a 0.6 mm thick iron plate, one end of the iron plate is vibrated by an oscillator, the other end is subjected to vibration by a vibrating needle big amplifier, and the magnitude of the vibration is measured. Table 1 shows the reduction in vibration when a test piece is attached compared to the magnitude of vibration when the steel plate is used alone, and it can be said that the larger this value is, the greater the vibration damping performance is.

[Examples 2 and 3 and Comparative Examples B and C3 The compositions shown in Table 1 were uniformly stirred and mixed to form a slurry, which was then formed into a sheet by a doctor blade method.
It was immediately dried at 100°C to obtain a sheet-like molded product. Table 2 shows the results of cross-sectional observation of the molded product using an electron microscope and the comparable characteristics along with comparative examples.

As shown in Table 2, if the amount of recovered ferrite added is less than 100 parts by weight, it is possible to uniformly disperse the ferrite particles, but the sound insulation and vibration damping properties are poor, and the recovered ferrite is less than 100 parts by weight. It is difficult for the Mi additive effect to be fully expressed.

On the other hand, if the amount of recovered ferrite added is more than 1400x parts, the synthetic resin or rubber necessary to uniformly disperse the ferrite particles will be insufficient, resulting in agglomeration of the ferrite particles.
Air bubbles appear.

Even if the amount of ferrite particles added is large, the rate of increase in specific gravity is small regardless of 'Dλ.

The effects of addition do not increase any further in terms of sound insulation and vibration damping properties. Furthermore, the molded product itself has disadvantages such as noticeable brittleness and reduced mechanical properties, resulting in poor handling during construction.

In contrast to the comparative example, according to the present invention, it is possible to uniformly fill a large amount of recovered 7-cycle light particles into synthetic resin or rubber, and as a result, a high degree of sound insulation and vibration damping performance can be achieved. It can be demonstrated.

As explained in detail above, according to the present invention, heavy metal-containing wastewater treatment products, which have conventionally been discarded without any effective use, can be turned into industrial materials with browning sound insulation and vibration damping properties. Possible Ruru○ Patent applicant RiRashi Co., Ltd. Agent Patent attorney Ken Honda

Claims (1)

[Scope of Claims] (1) Recovered ferrite consisting of precipitate containing heavy metal ions, which is obtained by adding ferrous ions and an alkaline substance to heavy metal-containing wastewater, is mixed into a synthetic resin or rubber emulsion. 100-140 for 100M parts
1. A method for producing a soundproofing material, which comprises forming a composition containing 0 parts by weight into a sheet or plate shape. (2) The manufacturing method according to claim 1, wherein the synthetic resin or rubber is an ethylene-vinyl acetate copolymer. (8) The manufacturing method according to claim 1 or 2, wherein the recovered ferrite is in a water-containing state.