JPH0655860B2 - Vibration control sheet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vibration damping sheet for imparting a vibration damping function to a building floor material or the like.

[Conventional technology and its problems]

Construction of high-rise houses or multi-story houses is progressing, and in such circumstances, there are many problems caused by vibration noise generated in adjacent homes, floors, etc.

Under such circumstances, countermeasures for suppressing vibration noise generated in individual homes or floors are being studied from various directions, and one of the means is to add a damping function to floor materials. .

The present inventors proposed a damping floor base material in Japanese Patent Application No. 1-170735. "This is a self-fusing rubber made of vulcanized granular rubber with an average particle size of 1.0 to 2.0 mm between at least one plywood that is made by stacking multiple wood veneers with their fibers intersecting and adhering together. , With a vibration-damping sheet bound by plastic intervening. ”

Although the above-mentioned proposal has obtained a damping effect and has been attracting attention from related parties, it has become necessary to have a higher characteristic in the evaluation process of the above-mentioned proposal.

That is, although the above proposal is sufficiently satisfactory in terms of vibration damping effect, the Japanese Agricultural Standards for plywood (revised December 1985, hereinafter referred to as JAS) include a regulation of strength and water resistance. The grade of water resistance is determined by the following three levels of immersion and peeling test: first, second and third.

Note (1) Type I immersion peel test The type I immersion peel test consists of immersing the test piece in boiling water for 4 hours and then drying it at a temperature of 60 ° C ± 3 ° C for 20 hours.
Immerse this in boiling water for 4 hours, then 60 ℃ ± 3 ℃
Dry for 3 hours at the temperature.

(2) Type II immersion peel test In the type II immersion peel test, the test piece is immersed in warm water at 70 ° C ± 3 ° C for 2 hours, and then dried at 60 ° C ± 3 ° C for 3 hours.

(3) Type III immersion peel test In the type III immersion peel test, the test piece is immersed in water at 35 ° C ± 3 ° C for 2 hours, and then dried at a temperature of 60 ° C ± 3 ° C for 3 hours.

In this test, the previously proposed one passes the dipping and peeling tests of the third and second types without any problem, but in the dipping and peeling test of the first type, the vibration damping sheet and the wood Floats were sometimes seen at the interface with the board.

In view of the above, the present invention sufficiently passes the JAS first-class immersion peel test without impairing the vibration damping effect of the already proposed plywood and without using a separate adhesive in the manufacturing process. An object is to provide a vibration damping sheet that can be used as a vibration damping plywood.

[Means for solving problems]

In order to solve the above problems, in the present invention, the weight part of butyl rubber and the total weight part of polyvinyl butyral and modified polyolefin having a polar group are 60 to 90:
The ratio is 40 to 10, and the total weight part of the polyvinyl butyral and the modified polyolefin having a polar group is 40 to 40.
The modified polyolefin having a polar group out of 10 is less than 30 parts by weight and is 7 parts by weight or more.
As the parts by weight, 60 to 220 parts by weight of vulcanized granular rubber having an average particle diameter of 0.8 mm to 2.0 mm was added and compounded and kneaded to obtain a vibration damping sheet having a sheet-like structure.

When the butyl rubber is smaller than the above range, the vibration sound (wave) absorption effect cannot be obtained. When it is large, a long-term static load causes tilting deformation (deformation of household goods placed on the corner of the floor due to static load). The butyl rubber may be 30 to 50 parts by weight of raw butyl rubber and 60 to 20 parts by weight of regenerated butyl rubber in a ratio with a modified polyolefin or the like.

When the polyvinyl butyral is less than the above range, the settling occurs, and when the polyvinyl butyral is more than the above range, the vibration sound (wave) absorption effect cannot be obtained.

The modified polyolefin is an adhesive resin and has an acetoxy group represented by the following chemical structural formulas (I) to (IV):
Those having a hydroxyl group, a carboxyl group, an ester group, and the like, and commercially available brands include the following.

Dumiran: Mitsui Polychemical Co., Ltd. product name Madmer: Mitsui Petrochemical Industry Co., Ltd. product name Takemelt: Takeda Pharmaceutical Co., Ltd. product name UBE BOND: Ube Industries Co., Ltd. product name When this adhesive resin is smaller than the above range, it becomes difficult to pass the JAS first type immersion peeling test. On the other hand, 2
If 0 parts by weight is inserted, a sufficient effect can be obtained, and if more than 30 parts by weight is added, no further effect can be obtained. Not only is it economically disadvantageous, but also vibration noise (wave) caused by butyl rubber The absorption effect decreases.

If the particle size of the vulcanized granular rubber is too small, the vibration sound (wave) dispersion and absorption effects will be reduced. On the other hand, if the particle size is too large, not only is the vibration noise (wave) not well dispersed, but it becomes difficult to form a sheet after kneading. Further, when the compounding amount is small, tilt deformation occurs due to a long-term static load, and the effect of dispersing vibration sound (wave) deteriorates. On the other hand, when the amount is too large, the amount of butyl rubber between particles becomes relatively small, the absorption of vibration sound (wave) becomes poor, and it becomes difficult to form a sheet.

In addition to the above constitution, calcium bicarbonate as a filler, zinc stearate as a lubricant, lead stearate, powdered stearic acid, paraffin flakes, zinc white as a stabilizer,
As a softening agent, a process oil, a coloring agent and the like can be appropriately selected and added.

[Action]

In the vibration damping sheet according to the present invention configured as described above, the vulcanized granular rubber dispersed in the sheet, butyl rubber (BR) filling the gap between the vulcanized granular rubber and low density polyethylene (LDP).
The vibrating sound (wave) is efficiently dispersed and absorbed by E).

Further, based on the synergistic effect of the self-bonding property of butyl rubber and the adhesive resin having the heat-bonding property, by applying heat and pressure during the production of plywood, sufficient adhesive strength that can withstand the first class immersion peel test is given. It

Further, by blending polyvinyl butyral within the above range, appropriate hardness is given and inclination deformation due to long-term static load is prevented.

〔Example〕

Examples 1 to 6 of the present invention, conventional examples 7 and 8, and comparative examples 9 to 11
The composition of the above is shown in the upper column of Table 1, and the vibration damping sheet was manufactured with the composition.

To make it, first weigh each agent to the specified number of copies,
In a Banbury mixer, butyl rubber, recycled butyl rubber,
Polyvinyl butyral, modified polyolefin resin (UBE B
OND M1000), calcium bicarbonate, zinc white, and zinc stearate are sequentially added, and after a little kneading, a processability-imparting oil (process oil) is added and kneading is performed at 130 ° C for 12 minutes. Open it and drop it on the adjusting roll to make the raw material plate. This raw material plate was passed through a calender roll to obtain each damping sheet as a sheet having a predetermined thickness.

In order to perform the vibration damping characteristic test and the immersion peeling test of each sheet, shown in Fig. 1, veneer 1: 1.5 mm, plywood 2: 5.5 m
m, damping sheet 3: A damping plywood a made of 2.0 mm was manufactured. The manufacturing conditions are as follows. No adhesive is used for the intervening portion of the vibration damping sheet 3, a known adhesive is used for the adhesion of the wood (single board 1, plywood 2), the amount of paste: 32-39 kgf / cm ² , and the heat and pressure temperature: 125 ° C
~ 130 ° C, surface pressure: 8 ~ 10kgf / cm ² , hot pressing time: 3.
It was 5 to 5 minutes.

In addition, first, the vibration damping characteristic test is performed by the stand A shown in FIG. 2 (a).
(Daiki: 105 × 210 × 2680mm, root (Thickness: 45 x 45 x 1730 mm) is manufactured, and this is fitted into the mount mounting hole of the measurement chamber and putty is embedded in the peripheral edge thereof, and mounted on the mount A as shown in Fig. 2 (b). , Each damping plywood a was placed. The floor impact sound level of this test body a was measured according to JAS A 1418-1978 (a method for measuring the floor impact sound level at a building site) with the specifications shown in FIG. It was done in. The sound receiving room is
It was a reverberation room of 134 m ² . The impact point is shown in FIG.

The results of the experiment are shown in the lower column of Table 1, and according to the results, the samples of Examples had effective vibration damping action, and no peeling occurred in the first-class immersion peeling test.

[Effect] As described above, the damping plywood manufactured by the damping sheet according to the present invention has the same damping effect as the conventional one,
In addition, it passes the JAS first-class immersion peel test sufficiently.

[Brief description of drawings]

FIG. 1 is a partial perspective view of an embodiment of a vibration damping sheet according to the present invention, which uses a vibration damping plywood, FIGS. 2 (a), (b), FIG. 3, and FIG.
The figure is a perspective view for explaining the test, a schematic diagram, and a hitting point diagram. 1 ... Wood veneer, 2 ... Plywood, 3 ... Damping sheet, a ... Damping plywood, A ... Frame.

Claims (1)

[Claims] 1. A weight part of butyl rubber and a total weight part of polyvinyl butyral and a modified polyolefin having a polar group are in a ratio of 60 to 90:40 to 10, and the polyvinyl butyral and the modified polyolefin having a polar group are contained. Of the total parts by weight of 40 to 10, the modified polyolefin having a polar group is less than 30 parts by weight and 5 parts by weight or more, and the total amount is 100 parts by weight, and the average particle size is 0.8.
A vibration damping sheet comprising 60 to 220 parts by weight of vulcanized granular rubber having a diameter of mm to 2.0 mm, compounding and kneading, and forming the mixture into a sheet.