JPH072867B2 - 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.

[Prior art and its problems] Construction of high-rise houses or multi-story houses is progressing, and during this time, troubles frequently occur due to vibration noise generated in adjacent homes, floors and the like.

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

The present inventors proposed a damping floor base material in Japanese Patent Application No. 1-170735. This is "a vulcanized granular rubber with an average particle size of 1.0 to 2.0 mm is self-fusing rubber between at least one stack of plywood, which is made by stacking multiple wood veneers with their fibers crossed and bonded together. , With a vibration-damping sheet that is bound with 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, the above proposal is not sufficiently satisfactory in terms of damping effect, but the Japanese agricultural and forestry standards for plywood (revised December 1985,
Hereinafter referred to as JAS. There is a regulation of water resistance in addition to the regulation of strength, and the grade of water resistance is determined by the following three-level immersion peeling test of the first, second and third categories.

Note (1) Type I immersion peel test In the type I immersion peel test, the test piece is immersed in boiling water for 4 hours, then dried at a temperature of 60 ° C ± 3 ° C for 20 hours, and then immersed in boiling water for 4 hours. Further, it is dried at a temperature of 60 ° C. ± 3 ° C. for 3 hours.

(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 Floating was sometimes seen at the interface with the veneer.

The present invention, in view of the above, does not impair the vibration damping effect in the already proposed plywood, and does not use a separate adhesive in the manufacturing process, and sufficiently passes the immersion peeling test of the JAS first class. An object is to provide a vibration damping sheet obtained 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 modified polyolefin having a low-density polyethylene and a polar group are 60 to 90:40 to 10
In the total weight part 40 to 10 of the low-density polyethylene and the modified polyolefin having a polar group, the modified polyolefin having a polar group is less than 30 parts by weight and 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 constitution.

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). This butyl rubber is made from raw butyl rubber in a ratio with modified polyolefin.
It is also possible to use 30 to 50 parts by weight and regenerated butyl rubber to 60 to 20 parts by weight.

When the low density polyethylene is smaller than the above range,
When settling occurs and becomes large, the effect of absorbing vibration sound (wave) 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.

Dumir: Mitsui Polychemical Co., Ltd. product name Admer: Mitsui Petrochemical Industry Co., Ltd. product name Takemelt: Takeda Pharmaceutical Co., Ltd. product name UBE BOND: Ube Industries, Ltd. product name When this adhesive resin is smaller than the above range, it becomes difficult to pass the JAS first-class immersion peel test. On the other hand, if 20 parts by weight is inserted, a sufficient effect will be obtained, and if it exceeds 30 parts by weight, no further effect will be obtained, which is not economically disadvantageous. Wave) 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 vibration sound (wave) is generated by the vulcanized granular rubber dispersed in the sheet, the butyl rubber (BR) filling the gaps, and the low density polyethylene (LDPE). Are efficiently dispersed and absorbed.

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

Furthermore, by blending the low-density polyethylene in the above range, appropriate hardness is imparted and inclination deformation due to long-term static load is prevented.

〔Example〕

The formulations of Examples 1 to 6 of the present invention, Conventional Examples 7 and 8 and Comparative Examples 9 to 11 are shown in the upper column of Table 1, and vibration damping sheets were produced with the formulations.

To make it, first weigh each agent to the specified number of copies,
In a Banbury mixer, butyl rubber, recycled butyl rubber,
Low density polyethylene, modified polyolefin resin (UBE BO
ND M1000), calcium bicarbonate, zinc white, and zinc stearate are added in order, and after a little kneading, processability-imparting oil (process oil) is added and kneading is performed at 130 ° C for 120 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.

It is shown in FIG. 1 in order to perform the vibration damping characteristic test and the immersion peeling test of each sheet. A damping plywood a made of a veneer 1: 1.5 mm, a plywood 2: 5.5 mm, and a damping sheet 3: 2.0 mm was manufactured. The production conditions are as follows: no adhesive is used for the intervening part 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 glue: 32 to 39 kgf / cm ² , the heat and pressure temperature: 125 ℃ ~ 130 ℃, surface pressure: 8
It was -10 kgf / cm ² and hot pressing time: 3.5-5 minutes.

In addition, the vibration damping characteristic test is first performed on the stand A (Daiki: 105 × 210 × 2680 mm, root) shown in FIG. 2 (a). (Thickness: 45 x 45 x 1730 mm) is manufactured, and this is fitted into the pedestal mounting hole of the measurement chamber, and putty is embedded in the peripheral edge thereof, and as shown in the same figure (b), it is mounted on the pedestal A. , Each damping plywood a
Was placed. Measurement of the floor impact sound level of this test body a
According to JAS A 1418-1978 (measuring method of floor impact sound level at the site of building), the specifications shown in Fig. 3 were carried out at the Japan Building Research Institute. The sound receiving room 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), and 3rd.
FIG. 4 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 …… Stand.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kihachi Ohnishi 2-3-1 Iwata-cho, Higashi-Osaka City, Osaka Prefecture Tatsuta Electric Wire Co., Ltd. (56) Kai 627-177046 (JP, A)

Claims (1)

[Claims] 1. A weight part of butyl rubber and a total weight part of low-density polyethylene and a modified polyolefin having a polar group are in a ratio of 60 to 90:40 to 10, and the above low-density polyethylene and a modified group having a polar group. Total parts by weight of polyolefin
Of 40 to 10, the modified polyolefin having a polar group is less than 30 parts by weight and is 7 parts by weight or more, and the total amount is 100 parts by weight, and a vulcanized granular rubber having an average particle diameter of 0.8 mm to 2.0 mm 60 A vibration damping sheet characterized by adding up to 220 parts by weight and kneading and kneading to form a sheet.