JPH0777788B2 - Damping floor base material - Google Patents

Description

The present invention relates to a floor base material having a vibration damping effect.

[Conventional technology and its problems]

Construction of high-rise apartments has progressed,
There are many troubles caused by vibration noise generated on the floor.

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 underfloor material with these damping functions is plywood with a damping sheet interposed between a plurality of wood veneers.

On the other hand, plywood has a water resistance regulation as well as a strength regulation in the Japanese Agricultural Standards (revised December 1985, hereinafter referred to as JAS). The water resistance grade is determined by a three-level immersion peel test.

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 addition, as raw wood for the above plywood, Lauan has been used for many years because it has very few knots and is easy to process, but the consumption of plywood has increased, and as a result of deforestation, resources have been exhausted and forests have been depleted. Destruction is progressing and it is becoming an international problem.

Under such circumstances, it is becoming difficult to obtain Lauan today, and the price is gradually increasing. On the other hand, one of the coniferous trees, radiatapine, has been attracting attention as radiatapine, which is easy to plant and grows quickly, and it has been reported in previous studies that it will reach 50-60 cmφ in 30 years. . By the way, comparing the price of rawan and radiatapine is about 65:40.

However, Radiata Pine has a short internode and cannot take the long, uncut logs like Lauan. According to the results of the survey so far, the internodal length is 70 cm or less in Chile, 90 cm or less in South Africa, and 120 cm or less in New Zealand.

In view of the above points, the inventors of the present application, in Japanese Patent Application No. 1-303830, consist of plywood in which a front plate and a back plate are bonded and integrated to the front and back surfaces of the core material, and the core material is a coniferous tree around its outer peripheral surface. The required number of veneer sliced continuously along the direction is alternately crossed by 90 degrees and the fibers are stacked and bonded together, and the front plate and the back plate are jointless internodes of coniferous trees. It consists of a veneer that is obtained by continuously slicing a raw wood along the circumferential direction of its outer peripheral surface, the fibers of which are parallel to the short sides of the core material, and at least one superposed portion of each veneer has a vibration damping function. The sheet interposed, self-fusing, the damping sheet, the weight part of butyl rubber, the total weight part of the modified polyolefin having a polyvinyl butyral and polar groups, the ratio of 60 ~ 90: 40 ~ 10, the above, Has polyvinyl butyral and polar groups Of the total parts by weight 40 to 10 of sexual polyolefin, modified polyolefin having a polar group is 30
Less than 5 parts by weight and more than 5 parts by weight.
As a part by weight, 60 to 220 parts by weight of vulcanized granular rubber having an average particle size of 0.8 mm to 2.0 mm was added and compounded and kneaded, and a vibration damping floor base material in the form of a sheet was proposed.

This damping floor base material is easy to plant and uses fast growing coniferous trees, so the forest can be used for rotation in about 40 years, there is no need to worry about resource depletion, and the self-bonding property of damping sheets Since each plate material is joined with each other, the manufacturability is good, and the presence of granular rubber has superior vibration damping properties to the conventional ones, which are sufficiently satisfactory even in the above-mentioned three types of immersion and peeling tests. Is.

However, nowadays, when more space and time are desired, it is desired to further improve the vibration damping property in order to secure the space.
The vibration damping property is improved by increasing the thickness of the vibration damping sheet, but on the other hand, the front and back wood board materials of the floor base material are displaced due to the weak pressure resistance of the vibration damping sheet. That is, tilt deformation is likely to occur.

The present invention has been made in view of the above points, and an object thereof is to improve the damping property without thickening the damping sheet.

[Means for Solving the Problems]

In order to solve the above problems, in the present invention, in the vibration damping floor base material of Japanese Patent Application No. 1-330830 using the above-mentioned conifer, all or part of the core material is composed of particle board. I did.

Incidentally, the meaning of the range of parts by weight of butyl rubber and the like is the same as that of the invention of Japanese Patent Application No. 1-330830, but, again, when the butyl rubber is smaller than the above range, the effect of absorbing vibrational sound (wave) is I can't get it. 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 of modified polyolefin and the like.

When the polyvinyl butyral is smaller than the above range, the settling occurs, and when the polyvinyl butyral is larger 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, a hydroxyl group, a carboxyl group, an ester group, etc. represented by the following chemical structural formulas (I) to (IV). There are things.

Dumiran: Mitsui Polychemical Co., Ltd. product name Admer: Mitsui Petrochemical Industry Co., Ltd. product name Takemelt: Takeda Pharmaceutical Co., Ltd. product name UBE BOND M1000: Ube Industries Co., 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 structure of the vibration damping sheet according to Japanese Patent Application No. 1-30330,
Calcium bicarbonate as a filler, zinc stearate as a lubricant, lead stearate, powdered stearic acid, paraffin flakes, zinc white as a stabilizer, process oil as a softener, and a colorant may be appropriately selected and added. it can.

[Action]

In the present invention thus configured, the vibration damping property and the sound absorbing property are improved by the sound absorbing property and the vibration absorbing property of the particle board.

〔Example〕

An embodiment is shown in FIG. 1, in which the front and back plates are made of a wooden plate material 1, and a particle board 2 as a core material is interposed between them by a vibration damping sheet 3.

As shown in FIG. 2 (a), the wood board 1 is made by stacking and adhering 1.0 mm-thick single boards 1a, 1b, 1c and integrating them, and the fibers are alternately crossed by 90 degrees. There is. As shown in FIG. 2 (b), the veneers 1a, 1b, and 1c are slices of an unjointed radiata pine log W that has been internoded, sliced along the circumferential direction of the outer peripheral surface, so-called "glazed". Form.

The particle board 2 is a well-known one in which shavings are pressure-bonded through a binder, and has a thickness of 9 and 12 mm.
The vibration damping sheet 3 has the kneading composition (a, b, c,
d, e, f) and their thickness is 2.0 mm and 1.6 mm. That is, wood board 1 (3.0 mm), particle board 2 (9 mm), damping sheet 3 (2.0 mm, a, b, c,
d, e, f6 types) (Example 1) and wood board 1
(3.0 mm), particle board 2 (12 mm), damping sheet 3 (1.6 mm, a, b, c, d, e, f6 types) (Example 2) were manufactured.

The manufacturing conditions are that the vibration damping sheet 3 can be bonded to the other members 2 and 1 by the self-bonding property. A known adhesive is used for the adhesion of, and the amount of glue: 32-39 g /
m ² , hot pressure temperature: 125 ° C. to 130 ° C. surface pressure: 8 to 10 kgf / cm ² , hot pressure time: 3.5 to 5 minutes.

In addition, as a comparative example, the construction of only the wood board 1 is 15 mm
We made thick structural plywood.

When the floor impact sound level was measured according to JIS A 1418 in Examples 1 and 2 and Comparative Example, the former obtained an improvement result of 3 to 14 dB as compared with the latter. In particular, there was an improvement effect of 10 to 14 dB at 250 to 2000 Hz, which is a light impact sound in which impact sound is a problem.

In addition, in Examples 1 and 2, structural plywood grade 1 (90 ° direction) was used in accordance with the Japanese agricultural standard test method for structural plywood.
Table 2 shows the results of the bending test and the second-class bending test.

The results show that both examples are satisfactory as structural plywood.

In addition, it is not necessary to make all the particle boards 2 of the heartwood, and a part thereof is made of a single plate obtained by continuously slicing the same softwood as the heartwood of Japanese Patent Application No. 1-330330 along the circumferential direction of the outer peripheral surface thereof. It is also possible to form a plywood board in which the required sheets are alternately crossed at 90 degrees and stacked to be stacked and bonded together. At this time, the damping sheet 3 may be interposed between the particle board 2 and the intervening single plate.

〔The invention's effect〕

Since the present invention uses the particle board as described above, it has an effect of improving the vibration damping property and the sound absorbing property.

[Brief description of drawings]

FIG. 1 is a partial perspective view of an embodiment of a damping floor base material according to the present invention, and FIGS. 2 (a) and 2 (b) are manufacturing explanatory views of a wooden board material. 1 ... Wood board, 1a, 1b, 1c ... Veneer, 2 ... Particle board, 3 ... Damping sheet.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Jun Nakajima 2-3-1 Iwata-cho, Higashi-Osaka City, Osaka Prefecture Tatsuta Electric Wire Co., Ltd. (72) Inventor Kihachi Onishi 2-3-3 Iwata-cho, Higashi-Osaka City, Osaka Prefecture No. 1 in Tatsuta Electric Wire Co., Ltd. (72) Inventor Minoru Aoki 8-9-8 Hanabata, Adachi-ku, Tokyo Keio Corporation (72) Inventor Shunji Suzuki 8-9-8 Hanabata, Adachi-ku, Tokyo Within Keio Co., Ltd. (72) Inventor Shin Nishida 8-9-8 Hanabata, Adachi-ku, Tokyo Within Keio Co., Ltd. (56) Reference JP-A-3-162953 (JP, A)

Claims (3)

[Claims] 1. A core material comprising plywood in which a front plate and a back plate are bonded and integrated to the front and back surfaces of a core material, and the core material is a required number of single plates obtained by continuously slicing a coniferous tree along the circumferential direction of its outer peripheral surface. The fibers are alternately crossed by 90 degrees and stacked to be bonded and integrated, and the front plate and the back plate are obtained by continuously slicing an internode-free raw wood of conifers along the outer peripheral surface circumferential direction. Consisting of a plate, the fibers of which are parallel to the short side of the core material, and at least one superposed portion of each of the single plates, a damping sheet interposed, in a damping floor base material self-fused, The core material, the required number of the veneer and the particle board is integrally bonded, the damping sheet, the total weight part of butyl rubber and polyvinyl butyral and modified polyolefin having a polar group, 60 parts by weight. ~ 90: 40 ~ 10
In the total weight part 40 to 10 of the polyvinyl butyral and the modified polyolefin having a polar group, the modified polyolefin having a polar group is less than 30 parts by weight and 5 parts by weight or more, and the total weight is 100 parts by weight. As a part, 60 to 220 parts by weight of vulcanized granular rubber having an average particle size of 0.8 mm to 2.0 mm is added to this, and the mixture is kneaded to form a sheet, which is a damping floor base material. 2. The damping floor base material according to claim 1, wherein the core material is entirely made of particle board, and the damping sheet is interposed between the core material and the front and back plates. Material. 3. The damping floor base material according to claim 1 or 2, wherein the butyl rubber contains regenerated butyl rubber.