JPH07146686A - Production of functional sound insulating resin - Google Patents

Abstract

PURPOSE:To improve sound insulating property and sound absorbing property by adding to mix at least one kind of tannin and liqnin and at least one kind of chloral hydrate or diethyl amine into a specific mixture and dehydrating the coagulated material. CONSTITUTION:At least one kind of tannin and lignin as a coagulant and at least one kind of chloral hydrate or diethyl amine as a sound absorption activated agent are added into a polymer colloid or a mixture of the polymer colloid with an initial reaction water soluble condensation product of a thermosetting resin and mixed and the coagulated material is dehydrated. In this case, as a polymer colloid, acrylonitrile-butadiene rubber latex, styrene-butadiene rubber latex, natural rubber latex, polyurethane emulsion, epoxy resin emulsion and silicone emulsion are exemplified and the mixture of these one or more kinds can be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a functional sound-insulating resin which also has vibration-damping properties in addition to sound-insulating properties and sound-absorbing properties for preventing noise due to airborne sound or solid-borne sound. .

[0002]

2. Description of the Related Art Recently, due to the increase in noise accompanying the development of transportation facilities and the concentration of houses, it is an urgent task to prevent air-borne sound and solid-borne sound. From the viewpoint of energy saving and labor saving, sound insulation with good performance is provided. Materials have been demanded. Most of the sound insulation plates currently on the market are heavy metal plates or concrete plates, and they are used alone or as laminated plates, or sandwich laminated panels in which a sound absorbing material such as urethane foam or glass fiber is inserted between them. The former is often used, but the former is poor in sound absorption, difficult to block solid-borne sound, and heavy and labor-intensive, which is contrary to labor-saving, while the latter is bulky and uneconomical, and its sound absorption is also extremely low. In addition, it is difficult and time-consuming to process joints and joints, and it requires a great deal of money to prevent and detect gaps due to aging. Recently, a relatively large sound absorption property has been found for hydrated melanin and a few water-soluble polymers (for example, JP-A-64-3879).
5, JP-A-1-284558, JP-A-1-31259
9, JP-A-1-321494) has a weak mechanical strength because it is a hydrate, and deterioration of sound absorption occurs due to drying, aging, or slow structural change, which is inconvenient in use such as requiring sealing.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new sound insulation material which is remarkably improved in sound insulation properties and sound absorption properties, excluding such drawbacks.

[0004]

The method for producing a functional sound-insulating resin according to the present invention comprises a polymer colloid or a mixture of the polymer colloid and an initial reaction water-soluble condensate of a thermosetting resin, and tannin and lignin as coagulants. Of at least one of the above and at least one of hydrazine hydrate or diethylamine as a sound absorbing activator, and the mixture is dehydrated.

Examples of the polymer colloid include acrylonitrile-butadiene rubber latex, styrene-butadiene rubber latex, natural rubber latex, polyurethane emulsion, acrylic resin emulsion, vinyl acetate resin emulsion, ethylene-vinyl acetate resin emulsion, vinyl chloride resin emulsion and vinylidene chloride. Resin emulsion, polypyrrole emulsion, polyaniline emulsion, asphalt emulsion,
Examples thereof include epoxy resin emulsions and silicone emulsions, and of these, one kind or a mixture of two or more kinds can be used. Examples of the initial reaction water-soluble condensate of the thermosetting resin include any one of an initial reaction water-soluble condensate of a urea resin, a melamine resin and a phenol resin, and one or a mixture of two or more of these may be used. Can be used.

The polymer colloid is commercially available in the form of an aqueous emulsion, and the initial reaction water-soluble condensate of the thermosetting resin is also commercially available in the form of an aqueous solution, so that they can be used as they are. Lignin used as a coagulant is acidic,
It can be used regardless of whether it is alkaline or neutral, and a powdery product can be used as it is. Tannin is used, for example, as a low concentration aqueous solution of tannic acid. Tannin can be substituted with tannins such as tannin extract, pyrogallol, catechu, and catechin. Hydrazine hydrate or diethylamine used as a sound absorbing activator can be used as it is in a highly pure form. As shown in the examples below, the amount of each component used was 4 with the polymer colloid as the non-volatile component.
0 to 91% by weight, initial reaction water-soluble condensate of thermosetting resin as non-volatile content of 0 to 40% by weight, coagulant as pure content of 2 to 10% by weight, sound absorbing activator as pure content of 2 to 14% by weight % Mix.

According to the present invention, the deterioration of the sound absorbing property caused by the physical structure change due to the drying of the polymer colloid is reactivated by the addition of the sound absorbing activator to obtain a self-supporting sound insulating resin having a sufficient mechanical strength. Further, according to the present invention, it is possible to obtain a functional sound insulating resin having three functions of sound insulation, sound absorption, and vibration reduction by overcoming the conventional wisdom and making it lightweight, and it is possible to block solid propagation sound as well as air propagation sound. When a sound wave having a frequency of f is vertically incident on a single plate made of a uniform viscoelastic body having an areal density of m, an attenuation constant of α and a thickness of d, the transmission loss is TL = T.
It is represented by L ₀ + α · d. Here, TL ₀ is the amount of loss according to the mass law, which is 20 · log ₁₀ (f · m) −42.5db.
Give in. TL ₀ increases logarithmically with increasing thickness, and the damping term due to internal loss increases linearly. Therefore, if α is large, it is possible to obtain a lightweight and high-performance sound insulating material having a sufficiently large transmission loss even if it is thin. Conventional sound insulation materials have been focused on simply making them heavier in terms of improvement.However, the present invention is a lightweight functional sound insulation material that reverses the usual way and increases absorption to improve sound insulation. It is the one we are trying to provide. In practical use, it is desirable that the sound wave attenuation is about the same as the mass law.
In the case of a soundproof door, if the upper limit of the thickness is around 3 cm, it will be 0.5.
KH _Z requires 5 db / cm. The functional sound-insulating resin according to the present invention satisfies this condition and is 27 Hz to 2 Hz.
The audible sound wave attenuation constant at KHz is about 5 db / cm or more.

The sound-insulating resin obtained by the present invention is a new material consisting of a single phase, which is a multifunctional sound-insulating material having both sound-insulating property and sound-absorbing property as well as vibration-damping property, and is mainly composed of polymer colloid. It has excellent film-forming properties and can be easily formed into films and fibers. Further, a composite having a high degree of dimensional stability can be obtained by adjusting the curing agent to be powdered and kneading and molding with a non-colloidal resin. At the time of use, an adhesive is appropriately used so that it can be freely patched to provide sufficient self-supporting convenience. Some of the present sound insulating resins, for example, vinyl acetate resins, are well adhered to gypsum, concrete, wood, etc., have appropriate shear loss and rigidity, and are useful as vibration damping and sound absorbing materials. Its epoch-making sound absorption property is probably based on the steady fluctuation of concentration between the two phases to which macromolecules in micelles belong, that is, the high order and the low order. I don't know for sure.

The present invention will be specifically described with reference to the following examples, but the present invention is not limited to the following examples. The percentages in the compositions of Examples, Comparative Examples, and Application Examples are% by weight.

[0010]

Example 1 Vinyl acetate resin emulsion having a nonvolatile content of 50% by weight (see Table 1), free formaldehyde 1 to
A water-soluble urea resin solution (see Table 1) having a nonvolatile content of 70% by weight containing 3% was mixed with hydrazine hydrate according to the composition shown in Table 2, and a 4% by weight aqueous solution of tannic acid was added and gently stirred to cause coagulation. The product was poured into a mold and dried in a desiccator for 20 days to obtain a plate-like solid product having a water content of almost 0%. Table 2 shows the results of measuring the audible sound wave attenuation constant of the plate-shaped solid matter by the sound insulation box. 125Hz, 500Hz, 1K
Audible sound wave attenuation constant in Hz is 22 db / c each
m, 9 db / cm and 9 db / cm. The measurement error was approximately ± 30%. This is 500 Hz of a water-insoluble rubber-like product made by mixing an aqueous solution of polyvinyl alcohol and an aqueous solution of a low polymer of urea, which are disclosed in JP-A-1-284558 by the same inventor of the present application, and adding a weakly acidic lignin and rolling the mixture into a water-insoluble rubber-like product. Audible sound wave attenuation constant at 0.7 db / c
m, audible sound wave attenuation constant at 1 KHz 1.7 db / c
It is extremely superior to m.

[0011]

[Table 1]

[0012]

[Table 2]

[0013]

Examples 2 to 14 Using the raw materials shown in Table 1,
According to the composition shown in Table 4, a sound insulating resin was manufactured in the same manner as in Example 1. Tables 2 to 4 show the results of measuring the audible sound wave attenuation constants at 125 Hz, 500 Hz and 1 KHz. All of these results are above 5 db / cm,
It was found that the desired performance as a sound insulating resin was sufficiently satisfied. The reason why the 4.5% acetic acid aqueous solution was added in Example 8 is to promote aggregation.

[0014]

[Table 3]

[0015]

[Table 4]

Examples 12 and 14 are examples of a sound insulating resin produced from a polymer colloid, a coagulant, and a sound absorbing activator without using a water-soluble urea resin solution together. Examples 5 and 9 to 11 have the same density and rigidity (-10 ¹⁰ dyn) as those of ordinary polymers.
e / cm ² ), it is appropriately soft against bending, and the transverse wave is greatly attenuated. The addition of urea resin enhances the rigidity and maintains the sound absorption properties while having the vibration damping properties. The Young's modulus of Example 5 was 3 × 10 ¹⁰ dyne / cm by the vibration lead method.
² and the loss coefficient was 0.1.

[0017]

Examples 15 and 16 Example 15 shown in Table 5 is an example in which an asphalt emulsion is used as a polymer colloid, and Example 16 uses a water-soluble melamine-urea resin liquid as an initial reaction water-soluble condensate of a thermosetting resin. It is an example. In all cases, the audible sound wave attenuation constant at 500 Hz was 5 db / cm or more.

[0018]

[Table 5]

[0019]

[Comparative Examples 1 to 4] Comparative Examples 1 and 4 shown in Table 6 are cases where no sound absorbing activator was used, and Comparative Examples 2 and 3 were cases where no coagulant was used. The constant was 0 db / cm.

[0020]

[Table 6]

[0021]

Application Examples 1-2: The functional sound-insulating resin of the present invention can be used as a mixture with an ordinary polymer resin having compatibility, in order to improve dimensional stability and other physical properties. Specifically, the sound insulating resin of the present invention is mechanically crushed to sufficiently degas the reaction gas, and is kneaded with the compatible polymer resin and molded into a plate. As an application example 1, a case where it is mixed with a vinyl acetate resin, and as an application example 2 is a case where it is mixed with an epoxy resin. In Table 4, above the double line is the raw material compounding ratio of the sound insulating resin of the present invention (in parentheses is nonvolatile or pure content conversion: 100% in total), and below the double line is the use of a synthetic resin mixed therewith. Percentage (in parentheses,% converted to non-volatile content with respect to sound insulation resin: outside number). Since the sound wave absorption decreases according to the mixing ratio, the design of the sound insulation material is easy. The mechanical strength of the material is determined by the vitrification temperature and depends on the plasticizer, curing agent or vulcanizing agent. The optimum strength can be determined by trial and error by these blends.

The examples shown in Tables 3 and 4 are suitable as caulking materials and sealing materials for joints of lightweight concrete and cellular concrete. Example 12 was modified into a hard resinous rubber by vulcanizing it in rubber form or adding urea resin, and the resinous materials of Examples 5 and 9 were softened by adding a plasticizer such as normal butyl phthalate (DBP). Any resin can be used. The plastic material thus obtained has Young's modulus E ′ = 6.3 × 10 ⁸ dyne / cm ² , η
(E ″ / E ′) = 0.3 viscoelasticity, which is 10 ¹⁰ dy
A composite plate bonded with a particle board having ne / cm ² , η _b = 0.1 and d _b = 0.3 cm has η = 2.9, ΔL =
A significant resonance loss of 20 db is expected. These values were calculated from the following relational expressions. η = 14η _E · (E ′ / E _b ) / (d / d _b ) ² , ΔL = 20 · log (η / η _b ) (Yoshikazu Iida, Damping Material and its Application, 1984, Mechanical Design, VOL.28, No2, PP.36-48). Further, as is clear from the transmission loss relational expression, f = 0.5 KHz
It can be said to be an epoch-making composite sound insulating plate because it absorbs 6 dB / cm of sound volume. Further, since Examples 5, 6 and 12 can be formed into various shapes, for example, a thread, a film, and a sponge, the range of application thereof is extremely wide. Mechanically crushed particles and powders mix well with gypsum, cement, etc.,
It is expected to be applied as a sound absorbing gypsum and a sound absorbing cement, and it was found that the former exhibits a sound absorbing property of about 10 db / cm and the latter exhibits a sound absorbing property of about 0.7 db / cm. Injecting a suspension of powder and water into the ground is effective in preventing noise from the subway and absorbing seismic waves. Kneading-molded plates with a compatible resin, for example, Application Examples 1 and 2 have excellent dimensional stability and are most suitable for partition plates and soundproof doors. The material has a wide range of uses, including a wide range of applications such as civil engineering and building materials, ships, vibration damping and sound absorbing materials for vehicles, and sound insulation materials for aircraft.

As mentioned above, amorphous substances composed of many anisotropic polymers, that is, melanin, lignin, low urea polymer, polyvinyl alcohol, polyacrylamide,
In addition, we found remarkable audible sound absorption of some polymer colloids (unpublished), and conducted repeated studies on the development of new soundproofing materials. The common feature of these materials is that they have an amorphous phase and local Has a liquid crystal anisotropy, and is composed of rod-shaped, plate-shaped, or three-dimensional structure micelles. Therefore, the acoustic polaron due to the interaction of electrons and sound quanta along the molecular chain segment participates in electrical conduction, and the resulting large sound absorption performance is described by self's irreversible, steady, and stochastic resonance absorption. Ah From the above experimental results and theoretical background, polymer colloids should generally exhibit sound absorbing activity as long as the local order is maintained, and the expected results were obtained through the experiments described above. The number of polymer colloids used was relatively small, and the amounts of stabilizers and plasticizers were not constant.Therefore, although limited in variety, it was concluded that the disclosed method maintained anisotropy and maintained activity. Is believed to apply to all polymer colloids. Although the present invention has been disclosed with respect to various embodiments, it is not limited thereto. Acoustic engineers can implement the invention in various forms without departing from the scope of the claims and the technical idea thereof.

[0024]

EFFECTS OF THE INVENTION A functional sound insulating resin having sound damping and sound absorbing properties for preventing noise due to airborne sound or solid propagated sound as well as vibration damping property can be obtained.

Claims (4)

[Claims] 1. A polymer colloid or a mixture of the polymer colloid and an initial reaction water-soluble condensate of a thermosetting resin,
A process for producing a functional sound-insulating resin, which comprises adding and mixing at least one of tannin and lignin as a coagulant and at least one of hydrazine hydrate or diethylamine as a sound absorbing activator to dehydrate the condensate. 2. The polymer colloid comprises acrylonitrile-butadiene rubber latex, styrene-butadiene rubber latex, natural rubber latex, polyurethane emulsion, acrylic resin emulsion, vinyl acetate resin emulsion, ethylene-vinyl acetate resin emulsion, vinyl chloride resin emulsion, chloride. The method for producing a functional sound insulating resin according to claim 1, which is at least one of a vinylidene resin emulsion and an asphalt emulsion. 3. The initial reaction water-soluble condensate of the thermosetting resin is an initial reaction water-soluble condensate of any of urea resin, melamine resin and phenol resin. Manufacturing method of functional sound insulation resin. 4. A polymer colloid having a nonvolatile content of 40
˜91% by weight, initial reaction water-soluble condensate of thermosetting resin as non-volatile content 0-40% by weight, coagulant as pure content 2
-10% by weight, 2 to 14% by weight of sound absorbing activator as a pure component
The method for producing a functional sound-insulating resin according to claim 1, 2 or 3, wherein the mixing is performed at a ratio of.