JPH0572864B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a subfloor material having a vibration damping effect. [Prior art and its problems] As the construction of high-rise houses and apartment complexes progresses, troubles caused by vibration noise generated in neighboring homes, floors, etc. are occurring frequently. Under these circumstances, various measures are being considered to suppress the vibration noise generated in individual homes or floors, and one of the methods is to add vibration damping functions to flooring materials. . The present inventors proposed a vibration-damping flooring material in Japanese Patent Application No. 1-170735. This is a vibration-damping sheet made by binding self-adhesive rubber or plastic between at least one stack of plywood, which is made by stacking and bonding multiple wood veneers so that their fibers intersect. It is something that can be achieved by intervening. There has been interest from related parties in the ability to obtain vibration damping effects with the above proposal, but in the process of evaluating the above proposals, a need has arisen for something with even higher characteristics. In other words, although the above proposal is fully satisfactory in terms of vibration damping effect, it is
Revised in December, hereinafter referred to as JAS. ), there are regulations on water resistance as well as strength regulations, and the following categories 1,
Water resistance grades are determined by three levels of immersion peeling tests: Class 2 and Class 3. Note (1) Class 1 immersion peel test In the Class 1 immersion peel test, the specimen is immersed in boiling water for 4 hours and then heated at a temperature of 60°C ± 3°C.
Dry for 20 hours, immerse in boiling water for 4 hours, and dry at a temperature of 60°C ± 3°C for 3 hours. (2) Class 2 Immersion Peeling Test For Class 1 Immersion Peeling Test, the test piece is heated at 70℃±3
60℃±3℃ after soaking in warm water for 2 hours
Dry at a temperature of 3 hours. (3) Type 3 immersion peel test For Type 3 immersion peel test, test pieces are heated at 35℃±3
After soaking in water at ℃ for 2 hours, dry at a temperature of 60℃±3℃ for 3 hours. In this test, the previous proposal passed the Type 3 and Type 2 immersion peeling tests without any problem, but in the Type 1 immersion peeling test, the vibration damping sheet and the wood material were removed after drying. Lifting was sometimes observed at the interface with the veneer. In view of the above, the present invention has been developed to meet the above JAS Class 1 immersion peel test without impairing the vibration damping effect of the already proposed flooring material and without using a separate adhesive in the manufacturing process. The challenge is to provide a vibration-damping flooring material that passes the test. [Means for Solving the Problems] In order to solve the above problems, in the present invention, in the damping flooring material proposed in the above-mentioned Japanese Patent Application No. 1-170735, the damping sheet is made of butyl rubber. and the total weight parts of low-density polyethylene and modified polyolefin having polar groups are 60 to
The ratio is 90:40 to 10, and out of the total weight parts of the low density polyethylene and the modified polyolefin having a polar group of 40 to 10, the modified polyolefin having a polar group is less than 30 parts by weight and 7 parts by weight or more, This total amount is 100 parts by weight, and the average particle size is 0.8 parts by weight.
60 to 220 parts by weight of vulcanized granular rubber with a diameter of mm to 2.0 mm was added and kneaded to form a sheet. When the butyl rubber is smaller than the above range, the effect of absorbing vibration sound (waves) cannot be obtained. In addition, when it is large, long-term static loads can cause tilting deformation (deformation due to the static loads of household goods placed in the corners of the floor). The butyl rubber can also have a ratio of 30 to 50 parts by weight of raw butyl rubber and 60 to 20 parts by weight of recycled butyl rubber in proportion to modified polyolefin and the like. If the low density polyethylene is smaller than the above range, it will sag, and if it is larger than the above range, vibration sound (wave) absorption efficiency will not be obtained. The above-mentioned modified polyolefin is an adhesive resin having acetoxy groups, hydroxyl groups, carboxyl groups, ester groups, etc. represented by the following chemical structural formulas () to (). Commercially available brands include the following: can be mentioned. Dumilan: Product name manufactured by Mitsui Polychemicals Co., Ltd. Admer: Product name manufactured by Mitsui Petrochemical Industries, Ltd. Takemelt: Product name manufactured by Takeda Pharmaceutical Co., Ltd. UBE BOND: Product name manufactured by Ube Industries, Ltd.

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[Effect]

The vibration-damping flooring material according to the present invention constructed as described above consists of vulcanized granular rubber dispersed in the vibration-damping sheet and butyl rubber (BR) and low-density polyethylene (LDPE) filling the gaps. Therefore, vibration sound (waves) is efficiently dispersed and absorbed. In addition, due to the synergistic effect between the self-bonding properties of butyl rubber and the adhesive resin that has heat-bonding properties, sufficient adhesive strength to withstand the Class 1 immersion peel test is imparted by heating and pressurizing during manufacturing. . Furthermore, by blending low-density polyethylene in the above range, appropriate hardness is imparted and tilt deformation due to long-term static loads is prevented.

【table】

〔Example〕

The formulations of Examples 1 to 6, 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 manufactured using these formulations. To make it, first, measure each agent to make a predetermined number of parts, and add butyl rubber, recycled butyl rubber, low-density polyethylene, modified polyolefin resin (UBE BOND M1000), calcium bicarbonate, zinc white, and zinc stearate to a Banbury mixer. After adding the mixture one by one and kneading it slightly, add processability imparting oil (processing oil) and kneading at 130°C for 12 minutes.The gate of the kneading mixer is opened and the mixture is dropped onto the adjustment roll to form a raw material plate. This raw material plate was passed through a calender roll to obtain each vibration damping sheet as a sheet having a predetermined thickness. Next, by using each vibration damping sheet,
Flooring material a shown in Figure 1 is veneer 1: 1.5mm, plywood 2:
5.5mm, damping sheet 3: 2.0mm.
The manufacturing conditions were: No adhesive was used for the intervening part of the vibration damping sheet 3, a known adhesive was used to bond the wood (veneer 1, plywood 2), glue amount: 32 to 39 Kgf/cm ² , hot pressure temperature:
The temperature was 125°C to 130°C, surface pressure: 8 to 10 kgf/cm ² , and hot pressure time: 3.5 to 5 minutes. The lower column of Table 1 shows the results of a Type 1 immersion peeling test performed on this flooring material a. In addition, we conducted a vibration damping property test for each subfloor material a.
(Hikiki: 105 x 210 x 2680 mm, joist: 45 x 45 x 1730
mm), fit it into the pedestal mounting hole in the measurement chamber, embed putty around the periphery, and install each subflooring material a on the pedestal A, as shown in Figure b. did. The floor impact sound level of this test specimen a was measured as follows:
The measurements were conducted at the Japan Building Research Institute with the specifications shown in Figure 3 in accordance with JAS A 1418-1978 (method for measuring floor impact sound levels at building sites). The sound receiving room was a ^134m2 reverberation room. The hitting point is shown in FIG. The test results are shown in the lower column of Table 1. According to the results of both of the above tests, the samples of Examples had an effective vibration damping effect, and no peeling occurred even in the Class 1 immersion peeling test. In addition, the subfloor material a having the configuration shown in FIGS. 1 b and c
A similar effect was obtained. [Effects] As explained above, the vibration-damping flooring material according to the present invention has the same damping effect as the conventional one, and in addition, it satisfactorily passes the JAS Class 1 immersion peeling test.

[Brief explanation of the drawing]

Figures 1a to 1c are partial perspective views of each embodiment of the damping floor underlayment material according to the present invention, Figures 2a, b, and 3.
4 are a perspective view, a schematic diagram, and a striking point diagram for explaining the test. 1... Wood veneer, 2... Plywood, 3... Vibration damping sheet, a... Vibration damping floor base material, A... Frame.

Claims (1)

[Scope of Claims] 1. A vibration damping device in which a vibration damping sheet is interposed between at least one stack of plywood made by stacking and bonding a plurality of wood veneers with their fibers intersecting and self-fused. In the flooring material, the vibration damping sheet has a ratio of 60 to 90:40 to 10 of the weight part of butyl rubber and the total weight part of low density polyethylene and modified polyolefin having polar groups, and the low density Of the total weight parts 40 to 10 of polyethylene and modified polyolefin having polar groups, the modified polyolefin having polar groups is less than 30 parts by weight and 7 parts by weight or more, and if this total amount is 100 parts by weight, average grain Vulcanized granular rubber 60~ with diameter 0.8mm~2.0mm
1. A vibration-damping floor base material, characterized in that 220 parts by weight is added and kneaded to form a sheet-like material. 2. The vibration-damping floor base material according to claim 1, characterized in that the vibration-damping floor base material contains recycled butyl rubber in the butyl rubber.