JPS6313499B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a sound insulation sheet that has a sound insulation effect with a rubber asphalt composition layer and has self-adhesion and flexibility.

In recent years, noise caused by the development of transportation systems, noise from factories and construction, and environmental noise from stereo karaoke and pianos has become a problem, and sound insulating materials have become necessary as a soundproofing measure.

As a measure of the sound insulation effect, the transmission loss expressed in decibels is often used as follows: transmittance (τ) = intensity of transmitted sound (T) / intensity of incident sound (I). Transmission loss is calculated as follows: Transmission loss (TL) = 10log (1/transmittance (τ)) = 10log (incident sound (I) / transmitted sound (T)) (dB).

In general, transmission loss applies to the mass law, and Transmission loss (TL) = 18log M・f−44 (random incidence), or Transmission loss TL ₀ = 20log M・f−43 (normal incidence) TL, TL ₀ : Transmission loss ( dB), M: Areal density (Kg/m ² ), : Frequency (Hz) The one with the higher areal density, that is, the weight per unit m ² is better.

Generally used as soundproofing material, concrete, ALC
Boards, slate, plasterboard, etc. are used,
The sound insulation effect decreases due to gaps caused by cracks and shrinkage, and the coincidence effect occurs in rigid bodies, which causes bending resonance due to sound waves at a certain frequency and reduces transmission loss.

In addition to soundproofing materials such as concrete, soundproofing sheets made of vinyl chloride mixed with metals such as iron, lead, or substances with high specific gravity such as barium sulfate are commercially available as sheet-like soundproofing materials. However, since conventionally known sound insulation sheets are not sound insulation layers or adhesive layers, they are attached to adherends using adhesives or staples. It has the disadvantage that it is difficult to install in complex areas such as around public objects, and it is not possible to obtain a sound insulating layer with airtight performance.

The sound insulation performance in the case of poor airtightness due to gaps etc. is calculated using the following formula.

=10log(1/) =10log(ΣFi/ΣFi・τi) τi=10 ^(-TL/10) ;Total transmission loss;Total transmission rate Fi;Individual area τi;Individual transmission rateFor example, when the transmission loss is 50dB concrete wall 10
If there is a gap of ^0.01m2 in ^m2 , then = 10log(10/9.99×10 ^-50/10 +0.01×1≒30(dB), and if there is a gap of ^0.01m2 in ^10m2 , the transmission loss will be should be 50 dB, but it is now 30 dB, reducing the sound insulation effect by 40%.You can see that the sound insulation effect will be affected if the airtightness is not improved.

The inventors completed this invention as a result of intensive research into a sound insulating sheet that does not have the above-mentioned drawbacks.

That is, this invention includes 10 to 100 parts by weight of a rubber substance, a metal, a metal oxide, and 100 parts by weight of asphalt.
To a mixture of 100 to 500 parts by weight of a metal salt or inorganic filler and 0 to 200 parts by weight of a softener, 0.03 to 1.0 parts by weight of sulfur is further added and mixed to form a mixture of 120 to 500 parts by weight.
The present invention relates to a sound insulating sheet characterized in that a rubber asphalt composition layer obtained by heating at 200°C for 1 hour or more is laminated on one or both sides of a flexible sheet-like base material.

The sound insulation sheet of this invention has good workability on adherends, workability between sheets, between sheets, in openings, around public objects, etc., and also has good airtightness and waterproof and moisture-proof performance. It has features not found in conventionally known sound insulation sheets. As the rubber asphalt composition for the sound insulation sheet, one that has adhesiveness and a high specific gravity is used, preferably a specific gravity of 1.3 or more, especially 1.5 or more, and preferably 10 to 100 parts by weight of the rubber substance to 100 parts by weight of asphalt. , 0 to 200 parts by weight of a softener, preferably 10 to 200 parts by weight, and 100 to 500 parts of a metal, metal oxide, metal salt or inorganic filler.
A rubber asphalt composition obtained by adding and mixing 0.03 to 1.0 parts by weight of sulfur and heating at 120 to 200°C for 1 hour or more can be used.

The asphalt of the rubber asphalt composition is generally called asphalt.

For example, natural asphalt and petroleum asphalts such as straight asphalt, blown asphalt and cutback asphalt can be used.

It is also possible to use mixtures of the aforementioned asphalts.

The rubber substance of the rubber asphalt composition includes natural rubber, synthetic rubber such as polybutadiene, polyisoprene, styrene-butadiene copolymer rubber, styrene-butadiene which is called A-B-A type or A-B type thermoplastic elastomer, Recycled products such as styrene-isoprene-block copolymer, chloroprene, isoprene-isobutylene copolymer rubber, ethylene-propylene copolymer rubber, and recycled butyl can be used, especially natural rubber,
Cis-1,4-polybutadiene, cis-1,4 polyisoprene, and styrene-butadiene copolymer rubber can be preferably used. Its Mooney viscosity is 30~
Preferably 60ML ₁₊₄ .

The softening agent for the rubber asphalt composition includes organic compounding agents generally used in rubber compounding, such as process oil, vaseline, petroleum resin, petroleum softening agents such as liquid polyethylene, polypropylene, polybutadiene, and polybutene, stearic acid, and lauric. Vegetable oil-based softeners such as acids and various plasticizers can be used.

The metal, gold oxide, metal salt or inorganic filler in the rubber asphalt composition may include iron, copper,
Metal powders such as lead, tin, zinc, nickel, stainless steel, iron monoxide, iron sesquioxide, triiron tetroxide, ferrite, lead oxide, tin oxide, zinc oxide, copper oxide,
Metal oxides such as aluminum oxide, metal salts such as barium sulfate, lead sulfate, lead carbonate, barium carbonate, and particulate fillings such as calcium carbonate, clay, carbon black, mica, diatomaceous earth, bentonite, magnesium carbonate, and lithopone powder. fibrous fillers such as asbestos, glass fibers, carbon fibers, etc. can be used.

One or more of the above metals, metal oxides, metal salts, and inorganic fillers may be used.

As the sulfur in the rubber asphalt composition, any sulfur that is generally used in rubber vulcanization can be used.

The rubber asphalt composition includes, in addition to asphalt, rubber substances, softeners, metals, metal oxides, metal salts, inorganic fillers, and sulfur, thermoplastic resins such as ethylene polymers, ethylene-vinyl acetate polymers, polypropylene, and polybutene. -1, polystyrene, acrylonitrile-butadiene-styrene copolymer, acrylonitrile-styrene-
Copolymers, polyvinyl chloride, chlorinated polyethylene, polyacrylonitrile, etc., and flame retardants such as antimony trioxide and halides can also be used to impart flame retardancy.

The sheet-like base material of the sound insulation sheet includes lead,
Thin sheets of metals and alloys such as copper, iron, aluminum, tin, and zinc, flexible sheets coated with foil and resin, vinyl chloride ethylene polymer,
Ethylene vinyl acetate copolymer, polypropylene,
Resins such as polybutene-1, polystyrene, polyacrylonitrile, polyamide, polyester,
Resin and rubber sheets made of chloroprene, polybutadiene, butyl rubber, styrene-butadiene copolymer, natural rubber, etc., woven fabrics, nonwoven fabrics, and felts made of asbestos, glass fiber, carbon fiber, or polyolefin, polyamide, polyester, polyvinyl alcohol-based synthetic fibers. Sheets impregnated with paper, asphalt, resin, etc., sheets laminated with woven fabric, non-woven fabric, cloth, etc. on the metal, resin, or rubber sheets mentioned above, and stretched and crosslinked sheets can be used. The sound insulation sheet of the present invention can be obtained by laminating the base material and the sound insulation asphalt composition on one or both sides at 120 to 200° C. using a known method, for example, using a lamination roll.

In the sound insulation sheet of the present invention, the thickness of the sheet-like base material is 0.01 to 2 mm, and the thickness of the rubber asphalt composition layer (thickness of only one side when rubber asphalt composition layers are laminated on both sides) is 0.3 mm. ~3
Preferably, the diameter is mm.

The sound insulation sheet of this invention has a high surface density with a layer of adhesive rubber asphalt composition, so the sheet has good flexibility and can be easily attached to a base material surface without an adhesive. It can be applied to complex areas such as bonding to adherends, joints between sheets, fittings, openings, and around public objects, so a sound insulation layer with excellent airtightness can be obtained. In addition, the rubber asphalt composition has a healing effect against damage caused by staples, nails, etc., and the repair area can be treated with patchwork using only compaction, resulting in good workability.

Examples and comparative examples are shown below.

The evaluation method for sound insulation sheets is shown below.

Test Example 1 A sample is fixed to the sound receiving chamber with an iron support frame in an acoustic testing apparatus having a sample area of 0.28 m ² , opening area of 0.25 m ² , sound source chamber volume of 0.85 m ³ , and sound receiving chamber volume of 2.0 m ³ . The joint between the sample and the sound receiving chamber is sealed using putty. As a sound source, a noise signal generator is used to generate a certain amount of noise from a speaker. A microphone was installed in the sound receiving room, and a lead wire was used to determine the transmission loss from the difference between the sound intensity when there was no sample and the sound intensity when the sample was attached, using an outdoor indicating noise recorder and frequency analyzer. .

Test Example 2 Flexibility was determined by bending resistance (45° cantilever method) according to JIS L-1085 (nonwoven fabric test method).

Test Example 3 After driving a nail with a diameter of 2.0 mm, the nail was removed and the sealability of the nail hole was observed with the naked eye.

Test Example 4 A sample cut into 2.5 cm width x 25 cm length was rolled back and forth twice on a stainless steel plate polished with an abrasive cloth (#280) using a 2 kg compaction roller, and the test piece was left for 24 hours and then
The adhesive strength was determined by peeling at 180° at a pulling speed of mm/min.

Test Example 5 Two samples cut to 30cm x 30cm were stacked 5cm apart and rolled using a rolling roller to create a lap joint.
A PVC pipe with a diameter of 20 cm and a height of 22 cm was attached to the top of the sample using molten blown asphalt (penetration 15). Water colored with red ink was poured into a PVC pipe to a height of 20 cm and left for 24 hours, then water leakage was examined.

Example 1 15 parts by weight of blown asphalt (penetration 15) and 20 parts by weight of straight asphalt (penetration 90), 20 parts by weight of process oil (trade name: Esso H-1), polybutene (trade name: Nisseki Polybutene)
HV100) 10 parts by weight and polyethylene (product name:
After heating 2 parts by weight of UBE PET-2522) to 160°C and stirring and mixing uniformly, it consists of high cis-1,4-polybutadiene (product name: UBEPOL BR, 43ML ₁₊₄ ) and straight asphalt (penetration 90). Add 40 parts by weight of masterbatch at a weight ratio of 1:1 and stir to mix and dissolve. Furthermore, 130 parts by weight of iron sesquioxide and 0.14 parts by weight of sulfur were added, and the mixture was heated and mixed at 160° C. for 3 hours to obtain a rubber asphalt composition for sound insulation. A sound insulation sheet with a thickness of 1.32 mm was made by using a sheet made by Keiwa Shoko Co., Ltd. (75 g/m ² , thickness 0.07 mm) made by laminating a sound insulation rubber asphalt composition heated to 160°C with a polyester film and a nonwoven fabric using a lamination roll. It was created. The base material thickness was 0.07 mm, the rubber asphalt composition layer thickness was 1.25 mm, and the weight per m ² , that is, the areal density was 2.20 Kg/m ² .

The sound insulation sheet obtained as described above was measured for sound transmission loss by the method of Test Example 1, and the results are shown in FIG. Next, the flexibility of the sound insulating sheet was measured using the bending resistance of Test Example 2, and found to be 3 cm. Test example 3
The sealability of nail holes was observed using the method described above, and although holes were formed in the base material, no through holes were observed due to the sealability of the rubber asphalt composition. When measuring the self-adhesion using the method described in Test Example 4, the adhesive strength was 2.6 kg/2.5 cm. Finally, airtightness was checked using the method of Test Example 5 for water leakage, but no water leakage was observed.

Example 2 15 parts by weight of blown asphalt (penetration 15) and 20 parts by weight of straight asphalt (penetration 90), 23 parts by weight of process oil (trade name: Esso H-1), polybutene (trade name: Nisseki Polybutene)
After heating 10 parts by weight of HV100 to 160°C and stirring and mixing uniformly, the weight ratio of high cis-1,4-polybutadiene (product name: UBEPOL BR, 43ML ₁₊₄ ) and straight asphalt (penetration 90) is obtained. is 1:1
Add 42 parts by weight of masterbatch and stir to mix and dissolve. Furthermore, 130 parts by weight of barium sulfate and 0.2 parts by weight of sulfur were added and mixed under heating at 160° C. for 3 hours to obtain a rubber asphalt composition for sound insulation. A sound insulation rubber asphalt composition heated to 160°C is laminated with a polyester film and a non-woven fabric to form a sound insulation sheet made by Keiwa Shoko Co., Ltd. (product name: Sunny Sheet B, thickness 0.07 mm) using a lamination roll to a thickness of 1.35 mm. I created a sheet. The base material thickness was 0.07 mm, the rubber asphalt composition layer thickness was 1.28 mm, and the areal density was 2.12 Kg/m ² .

When the sound transmission loss of the sound insulation sheet obtained as described above was measured by the method of Test Example 1, the sound transmission loss was equivalent to that of the sound insulation sheet used in Example 1. Next, the flexibility of the sound insulating sheet was measured using the bending resistance of Test Example 2, and found to be 4 cm. Nail hole sealing performance was observed using the method of Test Example 3, but as in Example 1, no through holes were observed. In order to examine self-adhesiveness, the adhesive strength was measured using the method of Test Example 4, and an adhesive strength of 2.8 kg/2.5 cm was obtained. Finally, the airtightness was checked using the method of Test Example 5 for water leakage, but no water leakage was observed.

Construction example A panel wall made of plywood with a height of 1.8 m, a length of 2.7 m, and a width of 1.8 m is coated with a mixture of vinyl acetate adhesive and water in a weight ratio of 1:1 as a primer.
It was applied so that it became g/ ^m2 . Example 1 after 6 hours
A sound insulating sheet (1 m width) was attached to the primer-coated surface so that the asphalt composition was in contact with the surface. The sound insulating sheets were joined together using a 5 cm overlapping hand roller. Workability on walls and corners was good. No abnormality was observed in this sound insulation sheet layer even after one month.

Comparative Example 1 A rubber asphalt composition was prepared by removing iron oxide from the sound insulation rubber asphalt composition of Example 1, and the above asphalt composition layer was laminated on the base material used in Example 1 using a laminating roll. Thickness
A sheet of 1.34 mm (area density 1.3 Kg/m ² ) was prepared.
The sound transmission loss of this sheet was measured by the method of Test Example 1. The results are shown in Figure 1.

Comparative example 2 PVC sheet mixed with iron oxide (thickness 0.6 mm,
The bending resistance of the material with an areal density of 2.0 Kg/m ² was measured using the method of Test Example 2 and was found to be 7 cm. In addition, when nail hole sealing performance was examined using the method of Test Example 3, through holes were observed with the naked eye.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the relationship between sound transmission loss (dB) and frequency (Hz) measured by sound transmission loss measurements, with frequency (Hz) plotted on the horizontal axis and sound transmission loss (dB) plotted on the vertical axis. Curve 1...Results for the sound insulation sheet of Example 1, Curve 2...Results for the sheet of Comparative Example 1.

Claims (1)

[Claims] 1 Add 0.03 parts by weight of sulfur to a mixture of 100 parts by weight of asphalt, 10 to 100 parts by weight of a rubber substance, 100 to 500 parts by weight of a metal, metal oxide, metal salt, or inorganic filler, and 0 to 200 parts by weight of a softener. ~1.0
A sound insulation product characterized in that a rubber asphalt composition layer obtained by adding and mixing parts by weight and heating at 120 to 200°C for 1 hour or more is laminated on one or both sides of a flexible sheet-like base material. sheet.