JPH05301326A - Fire retardant damping soundproof material - Google Patents

Abstract

PURPOSE:To obtain a building material being an interior material made of cardboard coinciding with the standards as a quasi non-combustible material established by the Building Standards Act and having fire retardancy in addition to damping soundproof effect. CONSTITUTION:A highly water-absorbable resin is applied to the inner surfaces of mutually opposed cardboards and, thereafter, a hot-melt adhesive is interposed between the coated surfaces to mutually bond the cardboards to constitute a sheet. The mutual sheets or the sheet and a gypsum board are laminated by an aqueous adhesive subjected to fire retardant treatment to obtain a fire retardant damping soundproof material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-damping and sound-proofing material for building materials, especially for inner walls, which functions as a semi-incombustible material.

[0002]

2. Description of the Related Art In recent years, it has been desired to use a material having a vibration damping and soundproofing function for building materials such as houses.
In particular, the appearance of an inner wall having excellent sound insulation performance is expected in an apartment house, etc., but a material suitable for it is not known yet.

"Neotone" (trade name of Honshu Paper Co., Ltd.) is available as a material for the inner wall which has an effect of suppressing noise and vibration, which is currently on the market.
The basic structure of this product is that a plurality of paperboards as a base material are laminated with a hot-melt adhesive (hereinafter simply referred to as a hot-melt agent or hot-melt resin) laminated, and the flame retardancy is poor. However, it was not always suitable as a building material. In addition to the above products, there are also known examples in which a composite of paperboard and gypsum board is formed using an emulsion type adhesive, both of which have excellent sound insulation performance, but flame retardant performance due to the characteristics of the material. Was scarce.
Furthermore, a method of applying flame retardant to the surface of paperboard or impregnating it by means such as impregnation is also known, but in this case, it is effective if a large amount of flame retardant is not used. There was a problem that it did not go up.

From such circumstances, conventional vibration damping and soundproofing materials for building materials cannot meet the standard of quasi-incombustible material stipulated in the Building Standards Law, and therefore, the use of quasi-incombustible material is obligatory. Since it can not be used for, the range of use was greatly narrowed.

The commercially available vibration-damping and sound-proofing material is disclosed in Japanese Patent Application No. 2-
Although it is disclosed in the specification of No. 238970, since this is a product in which paperboard is pasted with a hot melt resin as described above, even if the soundproof performance is high, the hot melt adhesive that is its constituent material burns. It has the drawback of being easy. As a countermeasure, it is possible to mix a flame retardant into the hot melt agent, but in that case, the adhesive performance is significantly reduced and the paperboards are easily separated from each other, and the surface of the hot melt agent is exposed. On the contrary, a problem occurs that the flame retardancy deteriorates.

[0006]

Here, the present invention has developed means for improving flame retardancy without mixing a flame retardant in the hot melt agent.
The contents are as follows. That is, the vibration-damping and sound-proofing material in the present invention is intended to impart the function of a quasi-incombustible material, and adheres the board as a base material through a hot-melt resin layer having a vibration-damping and sound-proofing function. In this case, the resin layer is adhered by sandwiching the resin layer with the following super absorbent polymer layer.

The water-absorbent resin is generally a starch-based resin,
Polymers or copolymers of cellulose-based or mixed compound-based materials are used, and a polymer having a structure insolubilized in water by three-dimensionalization, reticulation or crystallization is used. It has a hydrophilicity derived from it or a hydrophilicity imparted by a reaction, and usually has a water absorption capacity of several tens to several hundred times its own weight, and a large water absorption capacity of about 1000 times. The product form, depending on itself or the production method thereof, is amorphous powder, powder, fine particles, spherical particles, flakes,
There are various forms such as short fiber form, long fiber form, non-woven fabric form, film form and liquid form, but amorphous powder form is common.

The following can be mentioned as specific examples of the water absorbent resin. That is, (a) starch-acrylonitrile-based copolymer, starch-acrylic acid-based copolymer, starch-methyl methacrylate-based copolymer, starch-acrylamide-based copolymer, starch-vinyl acetate-based copolymer Starch-based polymers such as copolymers, (b) methylcellulose-based polymers, cellulose-based polymers such as cellulose-acrylonitrile-based copolymers, (c) acrylonitrile-based polymers, acrylic acid-based polymers , Vinyl acetate polymer,
Vinyl alcohol-based polymer, ethylenoxide-based polymer, acrylonitrile-vinyl acetate-based copolymer, vinyl acetate-methyl methacrylate-based copolymer, acrylic acid (salt) -vinyl alcohol-based copolymer And a synthetic compound-based polymer.

In the present invention, any absorbent resin may be used. These water-absorbent resins can retain a large amount of water, but in the present invention, it is desirable to use the water-absorbent resin in a low water-retention state so as not to hinder the adhesion with the hot-melt agent, and the water-absorbent resin has a solid content of 100 parts by weight. On the other hand, it is possible to use it in the range of 20 to 200 parts by weight of water retention. That is, the water-absorbent resin is 0.5 to 5 g in dry solid content.
It is used by coating on paperboard in the range of / m ² ; however, the superabsorbent resin usually has a solid content of 2.50 g / m ² or less. ~ 2.50
It is preferable to apply in the range of g / m ² .

By the way, this super absorbent resin has a moisture content of about 31.5%, 42% under its own weight at 20 ° C.
It is possible to hold about 12% in a C atmosphere, about 4% in a 100 C atmosphere, and about 1.5% in a 125 C atmosphere. It is a thing.

If necessary, a guanidine derivative-type flame retardant, or a sulfonated melamine resin-based flame retardant such as aluminum hydroxide may be added to the above superabsorbent resin.

Next, specific examples of the hot melt agent used in the present invention will be described. As the hot melt agent, known ethylene vinyl acetate copolymers, styrene copolymers, polyethylenes, polyamides, polyesters and polypropylenes are known. A base polymer such as the above is appropriately blended with a tackifier, a plasticizer, a filler, a wax, an antioxidant and the like and used. In addition, according to the results of examination by the present inventors, this hot melt adhesive is
Loss modulus (G "), which is the viscoelastic value at 10 to 40 ° C, is 10 ⁴
~ 10 ⁸ dyne / cm ² , loss tangent (tan δ) has a mild peak in the range of 0 ° C to 40 ° C, and its peak value is
It was found that a hot-melt adhesive having a thickness of 0.3 to 3.0 is preferably used, and it has been found that when such a hot-melt adhesive is used, vibration strains can be effectively absorbed. Among the above base polymers, styrene-isoprene-styrene copolymer and atactic polypropylene are preferably used as the base polymer.

Further, as the paperboard used in the present invention, a paperboard having a relatively large thickness is used, and the basis weight is preferably about 250 to 650 g / m ² .

As described above, in the first invention of the present application, the superabsorbent resin described above is applied to the surface of at least two paperboards, and the hot melt resin layer is sandwiched between the applied surfaces. The above paperboards are adhered to each other by interposing them, and the laminated paper having such a constitution is used as a basic sheet (hereinafter referred to as a sheet A), and if necessary, another sheet may be formed. The sheet A or the gypsum board or the like can be laminated.

That is, in the present application, as a second invention, another sheet A is provided on one side or both sides of the sheet A.
A sheet (hereinafter referred to as a sheet B) adhered with a water-based adhesive containing a flame retardant, and as a third invention, gypsum on one side or both sides of the sheet A or the sheet B via the same water-based adhesive. It includes a sheet (hereinafter referred to as a sheet C) formed by laminating boards.

In the above-mentioned second and third inventions, one of the requirements is to use an aqueous adhesive, and instead of this adhesive, an adhesive means similar to that of the first invention is used. It is not impossible to use, however, the manufacturing process becomes too complicated and the cost is high, so that the following water-based adhesive is used at the same time as a flame-retardant treatment for the water-based adhesive, It is characterized by imparting flame retardancy to the obtained product. By the way, even when the sheet A and the gypsum board are adhered to each other using the water-based adhesive, since the hot melt layer is present in the sheet A, the vibration damping and soundproofing property is sufficient. It is not always necessary to use the hot melt agent in other bonding steps. However, the use of a solvent-based adhesive is not preferable because the solvent enters the hot melt layer of the sheet A and causes a problem of residual solvent.

For the above reasons, in the second and third inventions, it is necessary to use an aqueous adhesive as the adhesive for adhering the sheets A to each other or for adhering the sheets A or B and the gypsum board. In addition, if a water-based resin is used, water can be added to the highly water-absorbent resin in the sheet A, and the flame retardant effect can be further enhanced.

As the water-based adhesive, an aqueous solution type or an aqueous dispersion type can be used. As the aqueous solution system, polyvinyl alcohol, starch, water glass and the like can be used. As the aqueous dispersion system, polyvinyl acetate, polyacrylic acid ester, polystyrene, styrene-butadiene copolymer and other modified products thereof and various copolymers can be used. In addition, these water-based adhesives need to be made flame-retardant, and inorganic ones such as water glass have already been made flame-retardant. Need to mix.

As the flame retardant, a guanidine type, a sulfonated melamine resin type, aluminum hydroxide or the like is used. About 10 to 30 parts of the flame retardant is preferable to 100 parts of the solid content of the adhesive, particularly preferably 15 to 25 parts. Is.

[0020]

The present invention uses the above-mentioned superabsorbent resin as a core for flame retardation, and has a structure in which a hot melt resin layer is sandwiched between them, so that a high content of moisture at room temperature is obtained. In the above, the hot melt resin layer is wrapped around, and at the same time, the water content of the paperboard itself can be improved, and as a result, the temperature rise can be prevented by the water content even when the fire source is brought closer. The flame retardant compounded in the emulsion adhesive as an auxiliary agent also has a high decomposition temperature of 373 ° C and can prevent the spread of the burning flame when the fire source is approached. In short, according to the present invention, it is possible to obtain the quasi-incombustible material specified in Ministry of Construction Notification No. 1372.

[0021]

EXAMPLES The concrete constitution of the vibration damping and soundproofing material according to the present invention will be described based on Examples. The test pieces were prepared by pasting paperboard through an aqueous adhesive on these products. The results of testing the degree of incombustibility based on the following test method are shown below. The test method is a simplification of the test method specified in Ministry of Construction Notification No. 1372, which specifies quasi-incombustible materials.

Examples 1 to 3 Commercially available superabsorbent resin "trade name Sumikagel L-5H" was used on the surface of 300 g / m ² of paperboard with a Meyer bar to obtain a solid content of 2.26 g / m ² (each). Example 1), 1.03 g / m ²
(Example 2) and 0.51 g / m ² (Example 3) is applied to form a water absorbing sheet, and a hot melt agent layer is formed on the coated surface side of the sheet as follows. That is, as an example, styrene-isoprene-styrene-
Using a hot-melt adhesive containing a styrene copolymer resin as a base polymer, and extruding it in a thin film form from a slit die so that its coating thickness is 60 μm, and laminating it on the surface of the super absorbent polymer layer in the sheet, and Before the hot melt layer is dried, the coated surfaces of the super absorbent polymer on another water absorbent sheet are overlapped and adhered to each other to be integrated. As described above, the basic sheet A is prepared by laminating the two water absorbing sheets with the hot melt adhesive layer interposed therebetween. In applying the super absorbent polymer to the paperboard, the humidity was adjusted so as to retain about 50% of its own weight, as described above.

Construction of Basic Sheet A: Paperboard / Superabsorbent Resin Layer / Hot Melt Adhesive Layer / Superabsorbent Resin Layer / Paperboard Example 4 Commercially available water-soluble guanidine derivative " 9 g / m ² dry weight of emulsion type resin adhesive “Polyzol L-101 (manufactured by Showa Polymer Co., Ltd.)” to which “Apinone 101 (manufactured by Sanwa Chemical Co., Ltd.)” (solid content: 15 parts by weight) is added. The basic sheet B is applied so that another basic sheet A is overlaid and laminated.
Was produced to obtain a vibration damping and soundproofing material corresponding to the second invention. The layer structure of the vibration damping and soundproofing material is as follows.

Structure of Basic Sheet B: Basic Sheet A / Emulsion Type Resin Adhesive Layer + Flame Retardant // Basic Sheet A Example 5 A commercially available sulfonated melamine resin (Sanwa Chemical Co., Ltd.) was used as a flame retardant on the surface of the basic sheet A. Basic sheet A was prepared in the same manner as in Example 4, except that DX-30 manufactured by Co., Ltd. was added.
A sheet B as a laminated body of was prepared. The layer structure is the same as that of the fourth embodiment.

Example 6 A basic sheet C was prepared by stacking gypsum boards on the surfaces of the basic sheet A and the basic sheet B by using the aqueous adhesive obtained by adding the water-soluble guanidine derivative described above,
A vibration damping and soundproofing material corresponding to the third invention was obtained. The layer structure of the vibration damping and soundproofing material is as follows.

Structure of basic sheet C: basic sheet A (or basic sheet B) / water-based adhesive layer + flame retardant / gypsum board Whether or not the basic sheet A obtained according to the first invention is suitable as a semi-incombustible material That point was judged according to the test method described below. Since the basic sheets B and C have a higher degree of flame retardancy than the basic sheet A, the conformity by the test is also applicable to the basic sheets B and C.

The test bodies and test methods used in the flame retardancy test will be described below.

Specimen 1 Two basic sheets A of Example 1 were coated with an emulsion type adhesive (Showa High Polymer, Polysol L-101, concentration 46%) so that the solid content was 9 g / m ^2. The base sheet B is laminated, and a paperboard (basis weight: 600 g / m ² ) is laminated on one side of the sheet with the same amount of the adhesive, and the test piece 1 is prepared.
Got

Specimen 2 To the base sheet B of Example 4, the same amount of adhesive (containing the flame retardant Apinone 101) as in Example 4 was used to make a board (600
g / m ² ) was adhered to obtain a test body 2.

Specimen 3 An adhesive similar to that used in Example 5 (containing a flame retardant sulfonated melamine resin) was added to the basic sheet B of Example 5.
A test piece 3 was obtained by sticking a paperboard (600 g / m ² ) using. Specimen 4 Specimen 4 was obtained by using ammonium polysonate as a flame retardant mixed with the emulsion type adhesive in the same configuration as Specimens 2 and 3.

Specimen 5 A laminate having the same structure as that of Specimen 1 was prepared as a Specimen 5 without using a super absorbent polymer.

Specimen 6 A laminate having the same structure as that of Specimen 2 was prepared as a Specimen 6 without using a super absorbent polymer.

Specimen 7 Instead of the superabsorbent polymer layer in Specimen 2, a layer composed of 80 parts of aluminum hydroxide and 20 parts of a phenolic binder was applied and laminated so that the solid content was 7 g / m ^2. The test piece 7 was used.

Next, the details of the test method will be described with reference to FIGS. After cutting each of the above-mentioned test pieces into the size as shown in FIG. 1, a through hole 10 having a diameter of 18 mm is bored at a position shown in the figure to form a test body 11, which is supported as shown in FIG. The test device 14 is installed obliquely via the frames 12 and 13. At the time of installation, the engaging hole 12 formed in the support frame 12
The test pins 1 to 7 are individually sandwiched by engaging the locking pin 13a provided on the lower support frame 13 with respect to a. The device 14 is provided with support rods 15 and 15 for receiving the support frame, and a gas burner 16 arranged between them, and the burner 16 is provided for a test body installed through the support frame. It is configured so as to be placed directly below the perforated portion 10. When setting the test body 11 in the support frames 12 and 13, as shown in FIG. 3, a glass mat 17 of 100 g / m ² indicated by the reference numeral 17 is provided on the upper surface side of the test body 5 in total. I will put a sheet. Using the test apparatus as described above, the flame of the burner 16 was applied to the central portion of the through hole 10 for 2 minutes to burn it, and then the flame was removed to measure the afterflame time inside the through hole 10. , As shown in Table 1 below. The flame was applied to the paperboard side of each test body.

[0035] As described above, the test bodies 1 to 4 using the product of the present invention
In each case, the afterflame time was short, and the test sample 5 was a comparative example.
~ 7 has a long afterflame time. This also shows that the flame-retardant effect is higher when the water-absorbing polymer is used than when the flame-retardant is simply used. Further, comparing the test body 2 with the test bodies 3 and 4, it can be seen that among the flame retardants, the water-soluble guanidine-based one has a markedly excellent effect. The reason for this is not clear, but since the sulfonated melamine resin and ammonium polyphosphate flame retardant weaken the adhesive strength of the adhesive, the adhesive surface peels off during the afterflame test, increasing the contact area between the flame and paper. While inhibiting the flame retardant effect,
It is considered that the water-soluble guanidine type does not inhibit the adhesive effect of the adhesive.

By the way, a 9 mm gypsum board was attached to the surface of the test body 2 on which the paperboard was not attached, using an emulsion type resin adhesive containing a water-soluble guanidine derivative. In the perforation test of No. 1372 (Sho 59.9.29), a value of 35 seconds afterflame was shown. That is, it was confirmed that the composition exhibited an excellent flame retardant effect far exceeding the reference value of 90 seconds, and that it can be used as a building material as a semi-incombustible material.

[0037]

EFFECT OF THE INVENTION The vibration-damping and sound-proofing material of the present invention comprises a base material sheet, which is a paperboard, and a hot-melt adhesive layer having excellent vibration-damping and sound-proofing effects. Since it is integrated in a sandwich state with a highly water-soluble superabsorbent resin layer, it has an excellent flame retardant effect as shown in Table 1, and in particular a gypsum board was stuck to the sheet of the present invention. The material is suitable for use as a quasi non-combustible material specified by the Building Standards Act. In addition, a plurality of the basic sheets A having the above-mentioned constitution are adhered to each other, as well as a laminate of the sheet A and a gypsum board are laminated with each other by using a water-based adhesive which has been subjected to a flame-retardant treatment. Therefore, the flame-retardant effect is enhanced as a whole structure, and therefore the products according to the present invention are useful in that they can be used as interior materials with high sound insulation, which are the current social needs.

Furthermore, since the main raw material is paperboard, it is lightweight, easy to handle, and easy to install. In addition, the highly water-absorbent resin exhibiting a nonflammable function is highly durable.
There is no decline in effect.

In addition, even when the flame retardant is mixed with the emulsion adhesive, since the flame retardant is an aqueous solution, it can be easily mixed during the laminating process, and the coating is simple.

[Brief description of drawings]

FIG. 1 is a plan view of a test body.

FIG. 2 is a side view of the test apparatus.

FIG. 3 is an enlarged cross-sectional view showing a state in which a test body is set on a support frame.

FIG. 4 is a perspective view of a support frame.

[Explanation of symbols]

 10 Through hole 11 Specimen 12, 13 Support frame 14 Test device 15, 15 Support rod 16 Gas burner 17 Glass mat

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F16F 15/02 Q 9138-3J

Claims (3)

[Claims] 1. A laminated paperboard in which superabsorbent resin is applied to the inner surfaces of opposing paperboards, and a hotmelt adhesive layer is interposed between the applied surfaces to bond the paperboards to each other. Combustion damping and soundproofing material. 2. A flame-retardant vibration-damping and sound-insulating material obtained by adhering two laminated paperboards according to claim 1 to each other with a flame-retardant water-based adhesive. 3. A flame-retardant vibration-damping and sound-insulating material, wherein a gypsum board is integrally bonded to the surface of the laminated paper board according to claim 1 or 2 with a flame-retardant water-based adhesive.