JPH01223187A - Self-adhesive flame-retardant sound-insulation sheet - Google Patents

Abstract

PURPOSE:To provide the subject economical sheet having high sound-insulation property, flame retardance and worakability and applicable over a wide application range, by combining a reinforcing base material with a sheet produced by compounding a synthetic rubber with fine metal powder, a tackifier and a flame-retardant at specific ratios. CONSTITUTION:The objective sheet is composed of (A) a sheet having a penetration of 20-200 and obtained by compounding (i) 100pts.wt. of a synthetic rubber preferably containing 60-100% of partially crosslinked butyl rubber with (ii) 100-500pts.wt. of metal powder such as iron powder having particle diameter of 30-300mum, (iii) 50-150pts.wt. of a tackifier such as coumarone resin and (iv) 10-100pts.wt. of a flame-retardant such as aluminum hydroxide and (B) a reinforcing base material composed of polyester fiber, vinylon fiber, glass fiber, etc.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a soundproofing material, and more specifically to a method of soundproofing by wrapping it directly around a sound source such as a building, a home appliance, a partition, a duct, or a wall surface. The present invention relates to a flame-retardant, sound-insulating sheet with self-adhesive properties that can be used for soundproofing by pasting it on objects, etc.

(Prior technology) Traditionally, non-vulcanized rubber sheets or composite sound-insulating materials made by laminating non-vulcanized rubber sheets and sound-absorbing materials such as glass wool and felt have been used as sound-insulating materials for buildings, home appliances, partitions, ducts, etc. has been done. □ Generally, in order to improve sound insulation performance, a method is used in which a high degree of inorganic filler is blended into non-vulcanized rubber to increase its specific gravity.

In addition, in the case of soundproofing sheets that are pasted on walls for soundproofing,
Paste the above-mentioned high-density soundproof sheet coated with acrylic adhesive or butyl rubber adhesive on the wall,
After applying the above-mentioned adhesive to the wall surface, a method such as pasting a high specific gravity rubber sheet is used.

(Problem H to be solved by the invention) In the case of these high-density soundproof sheets, since they contain a high degree of inorganic filler, the sheets become hard and difficult to conform to the curved or uneven surface of the soundproof sheet wall. There were problems with construction workability, and the sheet easily cracked when folded.

On the other hand, when the soundproof sheet is made soft, there are problems such as a decrease in tensile strength and heat resistance, and there are also problems such as large dimensional shrinkage of the sheet.

In addition, in the manufacturing process of composite soundproofing materials made by laminating sound-absorbing materials and sound-insulating sheets, it is necessary to apply an adhesive or adhesive when bonding the sound-absorbing materials and sound-insulating sheets, and the processing requires many man-hours. This resulted in a significant increase in costs.

Furthermore, if the sound insulation sheet is thick or hard, the method of wrapping it around the machine that is the source of sound insulation is very difficult to work with, and even if it is wrapped, the sound insulation material will not work properly. It was difficult to install the soundproofing material along with the soundproofing machine because it was bent, and there were also problems such as the sound absorbing material and the soundproofing material peeling off.

Therefore, when this type of highly filled composition is used as a sound insulating or sound absorbing material, there is a need for a material that has good sound insulating properties, workability in application, dimensional stability, heat deformation resistance, and satisfies low cost.

(Means for Solving the Problems) The present invention solves the above-mentioned problems, and in particular consists of a flexible sheet made of synthetic rubber, metal powder, a tackifier, and a flame retardant, and a reinforcing base material. The object of the present invention is to provide a self-adhesive flame-retardant and sound-insulating sheet.

In view of this situation, the inventors of the present invention have made intensive efforts to obtain a sound insulation sheet with high specific gravity that has improved flexibility, that is, workability in pasting, and excellent dimensional stability.As a result, the synthetic rubber 1
00 parts by weight of metal powder of 30-300μ 100-5
00 parts by weight, tackifier 50-150 parts by weight, flame retardant 1
By combining the sheet 1 containing 0 to 100 parts by weight with a penetration degree of 20 to 200 and the reinforcing base material 2, a high specific gravity sheet with sufficient adhesive strength, excellent flexibility, and excellent dimensional stability is obtained. A sound insulation sheet was obtained.

In addition, by using partially crosslinked butyl rubber as the basic synthetic rubber at 60% to 100%, a self-adhesive sound insulating sheet with excellent heat resistance, that is, excellent adhesive strength at high temperatures, can be obtained, and the above problems can be solved. They investigated this and completed the present invention.

(Structure of the Invention) As shown in FIG. 1, the constituent members of the present invention have a basic composition of 100 to 150 parts by weight of metal powder to 100 parts by weight of synthetic rubber.
Parts by weight, 50 to 150 parts by weight of tackifier, 10 to 150 parts by weight of flame retardant
A reinforcing base material 2 is embedded in a self-adhesive flame-retardant and sound-insulating sheet 1 made of 100 parts by weight.

The soundproof material shown in Fig. 2 is a self-adhesive flame-retardant sound-insulating sheet 1 with a reinforcing base material 2 embedded therein, a sound-absorbing material 3 provided on one side, and a release paper 4 provided on the other side. Because of its strength, it can be easily attached to walls for soundproofing.

The soundproofing material shown in FIG. 3 is a self-adhesive flame-retardant soundproofing sheet 1 with a reinforcing base material 2 embedded therein, and sound-absorbing material 3 is provided on both sides of the sheet, and can be wrapped around a machine or the like that is a sound source for soundproofing. be.

The structure of each self-adhesive flame-retardant and sound-insulating sheet shown in FIGS. 1 to 3 will be described in more detail.

The sound insulation sheet according to the present invention contains 10 to 500 parts by weight of metal powder of 30 to 300 microns, 50 to 150 parts by weight of a tackifier, and 10 to 100 parts by weight of a flame retardant, and has a penetration of 20 to 100 parts by weight based on 100 parts by weight of synthetic rubber. A self-adhesive flame-retardant and sound-insulating sheet with a thickness of 1 or less, consisting of a sheet of 200 and a reinforcing base material 2, and 60 to 100% based on 100 parts by weight of the above synthetic rubber.
is preferably partially crosslinked butyl rubber.

When the content of partially crosslinked butyl rubber is 60% or less, the adhesive strength at high temperatures decreases, so it is not preferable to use it in a high temperature atmosphere.

The metal powder used in the present invention has a particle size of 30 to 300μ and 1
00 to 500 parts by weight are used.

If the particle size is smaller than 30a, the adhesion of the compound will decrease, and if it is larger than 300μ, the sheet will lack smoothness, which is not preferable.

Furthermore, if the amount of metal powder is less than 100 parts by weight, the soundproofing performance will be poor, and if it exceeds 500 parts by weight, there will be a problem in that the processability will be poor when coating and molding into a sheet.

Metal powders used in the present invention include iron, lead, zinc, aluminum, silver, gold, platinum, copper, magnesium, nickel, tantalum, molybdenum, tin, titanium, chromium, zirconium, silicon, cobalt, tungsten, magnalium, Examples include metal powder or alloy powder.

It is preferable to add 50 to 150 parts by weight of the tackifier used in the present invention. If the tackifier is less than 50 parts by weight, the adhesive strength will be poor, and if it exceeds 150 parts by weight, the adhesive strength during heat resistance will be poor and it will be expensive. This is not desirable.

Examples of the tackifier used in the present invention include coumaron resin, terpene resin, terpene/phenol resin, petroleum hydrocarbon resin, and rosin derivative.

The flame retardant used in the present invention shall be added in an amount of 10 to 100 parts by weight. If it is less than 10 parts by weight, the flame retardant effect will be insufficient, and if it exceeds 100 parts by weight, the adhesive strength will be insufficient and it will be expensive. This is not desirable.

The flame retardants used in the present invention include aluminum hydroxide,
Examples include antimony oxide, boron compounds, bromine compounds, chlorinated paraffins, non-halogenated phosphate esters, and halogenated phosphate esters.

The properties of this compound are that the penetration value shown in JIS K2207 is 20 to 200, the specific gravity value shown in JIS K6350 is in the range of 1.7 to 4.0, and the adhesive strength is 1 kg/25 m+ or more. This shows that.

A reinforcing base material as shown in FIG. 1 is added to this compound (A) to form a sheet of IIIa1 or less.

The reinforcing base material used in the present invention has a wire diameter of 1 to 300 μm.
The structure restricts the fibers in the longitudinal and lateral directions, and the spacing between the fibers is 1 to 10 aa.The reason why the spacing between the fibers is particularly limited is that if the spacing between the fibers is smaller than 1a+a, the rubber compound Pinholes tend to occur because the coating cannot be applied uniformly, and if the spacing between fibers is 10111 or more, there is a problem with the mechanical strength of the sheet.

Since the rubber compound (A) alone is a soft sheet with a penetration of 20 to 200, it has problems with dimensional stability and mechanical strength, but by laminating the above reinforcing base material, good dimensional stability can be achieved. strength and mechanical strength.

As the reinforcing base material used in the present invention, materials such as polyester fiber, vinylon fiber, glass fiber, etc. are used.

The rubber compound (A) laminated with this reinforcing base material is made into a sheet with a thickness of 1 or less and has self-adhesive properties, so when laminating the sound absorbing material 3, it is necessary to apply an adhesive or an adhesive. Mona (and can be pasted on the wall).

Further, sound absorbing materials used in the present invention include glass wool, rock wool, felt, urethane foam, etc.
These can be freely selected depending on the purpose.

(Examples) Next, the present invention will be explained in detail using Examples and Comparative Examples.

Among the materials and chemicals used in these Examples and Comparative Examples, the following were used unless otherwise specified. The present invention is not limited in any way by the examples.

・Synthetic rubber Butyl rubber (product name Butyl 065, manufactured by Japan Synthetic Rubber Co., Ltd.) ・Partially crosslinked butyl rubber Butyl recycled rubber (product name A Butyl, manufactured by Danyo Rubber Co., Ltd.) ・Metal powder A Iron powder (product name Metalet, Metal Powder B Barium Sulfate (Product Name: Varico, manufactured by Hakusui Chemical Industry Co., Ltd.) - Metal Powder C Iron Powder (Product Name: Metalet, Japan Magnetic Separation Co., Ltd.)
・Tackifier: Tackifier resin (product name: Kokoretsu 2101, manufactured by Esso Chemical Co., Ltd.) ・Flame retardant: Non-halogen phosphate ester (product name: trioctyl phosphate, manufactured by Ohe Chemical Co., Ltd.) These The paste that is swollen in the organic solvent toluene and made into a solution is hereinafter referred to as compounded glue.

As the reinforcing base material, glass cloth (trade name: ECL55GA, manufactured by Unitika Co., Ltd.) with a fiber spacing of 1 to 3 IIn was used.

As the sound absorbing material, 6 mm thick glass wool (manufactured by Nihon Muki Co., Ltd.) was used.

All amounts used are given in parts by weight.

The test method of the present invention is as follows.

(Test method) (1) Surface condition: Visually observe the surface condition of the sound insulation sheet after drying.

(2) Adhesive Crab 2-1 Adhesive Crab in normal state A sound insulating sheet with a width of 25 mm and a length of 250 mm is pasted onto a degreased steel plate, and pressed back and forth twice with a 2 kg rubber roller.

The strength is shown after being allowed to stand at room temperature for 20 minutes and then peeled at 18° using a Tensilon tensile tester at a tensile rate of 300 mm/min.

2-2 Adhesion during heat resistance A sound insulating sheet with a width of 25 mm and a length of 250 am is pasted on a degreased steel plate and pressed back and forth twice with a 2 kg rubber roller.

The strength of this sound insulating sheet is shown when it was left standing in an atmosphere at 100° C. for 4 hours and then peeled at 180° using a Tensilon tensile tester at a tensile speed of 300 mm/min.

(Preparation method of test specimen) Place a glass cloth on the release paper and check that the thickness after drying is 0.
A sound insulation sheet was prepared by applying a blended glue to a thickness of 5 mm and drying in an atmosphere of 80° C. for 2 minutes, and a test piece was prepared by bonding the glass wool to the sound insulation sheet using a pressure roll.

(3) Measurement of penetration (JIS K2207): JIS
Measure using a penetrometer (Figure 4) specified in K2808.

A sample is packed into a container with a diameter of 6 cm and a height of 6 cm, and the sample is placed on the test stand of a penetrometer, and the zero point of the scale plate 6 is confirmed by bringing the tip of the needle into contact with the surface. After that, the clasp 10 is pressed and the needle 5 is inserted for 5 seconds. In this case, the total load on the needle is 100 g. Next, the penetration measurement rack 13 is gently brought into contact with the upper end of the holder 9, and the reading on the scale plate 6 is read and taken as the penetration value.

(4) Flame retardancy: A sound insulating sheet sandwiched with 4 cm of sound-absorbing glass wool was used as a test specimen, and a sample of 25 mW x 250 μL was exposed to indirect flame for 10 seconds in a Bunsen burner, and then the Bunsen burner was removed and the combustion was continued. If it lasts for 10 seconds or more, ×, 1
A rating of O was given when the flame disappeared within 0 seconds.

(5) Measurement of specific gravity (JIS K6350 6.1.1
>: Measure the mass (Wl) of the sample for measurement 0 Next, attach the sample to one end of the suspension wire, wash it in alcohol to prevent air bubbles from adhering to it, and then hang it in water at TOC to measure the mass of the sample. Weigh (Wt). Next, remove the sample from the suspension wire, and calculate the mass (W,) of the suspension wire alone to W! Weigh in the same condition as when you measured it.

Calculate the specific gravity using the following formula.

(However, d is the specific gravity of water at toC) (6) Dimensional stability: Cut the sound insulation sheet into a size of 100 gardens and 8100 towers, leave it in an atmosphere at 100°C without restraint, and measure the dimensional change on each side. did.

(7) Workability: The sound-insulating sheet was sandwiched with 4 squares of sound-absorbing glass wool, and the workability and peeling of the sound-absorbing material when wrapped around a 100 mm diameter cylinder were observed.

When workability is good and there are no abnormalities such as peeling O When workability is good and peeling etc. are observed Δ When workability is poor and peeling is observed × (8) Sound insulation: Figure 5 A sample of 500 x 500 aa was placed on the device shown in Figure 2, and the sound transmitted through the sample was captured to compare the sound insulation properties.

In FIG. 5, 18 is the outer case of the device, 19 is a sample provided in two spaces, 2OA and 20B are microphones, 21 is a speaker, 22 is a noise field generator, and 23 is a precision noise needle. , 24 is a 1/3 octave analyzer, and 25 is a high speed recorder.

The sound generated by the noise field generator 22 is transmitted through the speaker 21, and the transmitted sound is measured with the microphone 20A.Then, the sound transmitted through the sample is captured with the microphone 20B, and the precision sound level meter 23 measures the sound of both. Compare strength and measure sound insulation.

Examples 1-2: The composition shown in Table 1 was applied to glass cloth and heated at 80°C.
The sample was dried for 2 minutes to obtain a test piece.

These test pieces were measured according to the test method described above. The obtained physical property results are shown in Table 1 and FIG. 6.

As is clear from the results in Table 1, the sound insulating sheet of the present invention has excellent workability when laminated with a sound absorbing material: the adhesive force is well balanced and the surface condition and flame retardance are also excellent.

Furthermore, as is clear from the results shown in Figure 6, it has excellent soundproofing performance and is a soundproofing material with excellent total balance.

Comparative Examples 1-9: Example 1. Example 1.2 except that the composition ratio was changed from 2.
Samples were prepared in exactly the same manner as described above, and their physical properties were measured. The obtained physical property results are shown in Table 1.

As is clear from Table 1, the sound insulation sheet of Comparative Example 1 has poor adhesive strength during heat resistance, and the sound insulation sheet of Comparative Example 2 has slightly poor flexibility, so there are problems with workability and adhesive strength. There is.

The sound insulating sheet of Comparative Example 3 had a problem with the surface condition because the surface had large irregularities.

The sound insulating sheet of Comparative Example 4 had a problem with adhesive strength, and there was a problem with workability when the sound absorbing material was attached, and peeling of the sound absorbing material was observed.

The sound insulation sheet of Comparative Example 5 has problems with flame retardancy and adhesive strength during heat resistance.

The sound insulation sheet of Comparative Example 6 has a problem in flame retardancy.

The sound insulation sheet of Comparative Example 7 has problems in adhesive strength and workability.

The sound insulation sheet of Comparative Example 8 has a problem in sound insulation performance due to a large decrease in specific gravity.

The sound insulating sheet of Comparative Example 9 has a problem in flexibility and has a problem in workability due to poor adhesive strength.

In Comparative Example 10, a general-purpose PVC compound was sheeted to a thickness of 0.5 m, a butyl rubber adhesive was coated on both sides, and 6 mm thick glass wool was laminated on both sides.The workability is shown in Table 1. Figure 6 shows the soundproofing performance of a product laminated with a thickness of 1IaIII and attached to an iron plate of 1IaIII thickness.

As is clear from the results shown in Table 1 and FIG. 6, there was a problem in workability, and the sound insulation performance was also slightly inferior to that of the sound insulation sheet of Example 1 of the present invention.

Based on the above, the present invention is a sound insulating sheet with excellent flexibility, so it is easy to wrap around machinery that is a sound source, and the sound absorbing material does not lift or peel. It was confirmed.

In addition, since the sound insulation sheet of the present invention is a sound insulation sheet with self-adhesive properties, it is easy to apply to walls, and it has excellent workability when applied to curved surfaces, so it can be applied not only at room temperature but also when heat-resistant. It also has excellent adhesive retention.

Furthermore, the sound insulation sheet of the present invention has high specific gravity while retaining flexibility, so it has excellent sound insulation performance.

Furthermore, since the sound insulation sheet of the present invention is a sound insulation sheet that has flame retardancy, it can be applied to equipment that requires flame retardancy by combining it with flame retardant sound absorbing materials such as glass wool and flame retardant felt. be.

Furthermore, since the sound insulation sheet of the present invention has adhesive properties, there is no need to perform adhesive processing in a separate process as in the past, resulting in a significant reduction in the number of man-hours.

Therefore, the present invention is inexpensive, has excellent soundproofing performance, is flame retardant, and has excellent workability, so it has the advantage of greatly expanding the scope of application and being highly economical.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the sound insulating material of the present invention, Fig. 2 is a perspective view of the inventive sound insulating material and sound absorbing material laminated on one side, and Fig. 3 is a perspective view of the inventive sound insulating material and sound absorbing material laminated on both sides. Figure 4 is a perspective view of the penetration needle used in the penetration test of the present invention, Figure 5 is a schematic diagram of the device used in the sound insulation test of the present invention, and Figure 6 is the FIG. 2 is a characteristic diagram showing the soundproofing performance of a soundproofing sheet. 1... Sound insulation sheet 2... Reinforcement base material 3...
Sound absorbing material 4... Release paper 5... Needle
6... Scale plate 7... Test stand 8
... Frame 9 ... Needle holder 10 ... Clasp 11 ... Horizontal adjustment screw 12 ... Scale plate shaft 13
... Rack for measuring penetration 14 ... Support 15 River weight l6 ... Level 17 ... Fine adjustment knob 18 ... Outer case of the device 19 ... Sample 2OA, 20B ... Microphone 21...Speaker 22...Noise field generator 23...Precision sound level meter 24...1/3 octave analyzer 25...High speed recorder

Claims (1)

[Claims] 1. Comprised of 100 to 500 parts by weight of metal powder of 30 to 300 μm, 50 to 150 parts by weight of a tackifier, and 10 to 100 parts by weight of a flame retardant to 100 parts by weight of synthetic rubber, and the penetration is 20
A self-adhesive flame-retardant and sound-insulating sheet, characterized in that it consists of a sheet of ~200 and a reinforcing base material. 2. The self-adhesive flame-retardant and sound-insulating sheet according to claim 1, wherein 60 to 100% of the synthetic rubber is partially crosslinked butyl rubber. 3. The self-adhesive flame-retardant sound-insulating sheet according to claim 1 or 2, wherein a sound-absorbing material is attached to one side of the sound-insulating sheet. 4. The self-adhesive flame-retardant sound-insulating sheet according to claim 1 or 2, wherein a sound-absorbing material is attached to both sides of the sound-insulating sheet.