JPH0573581B2 - - 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. 1-170734. This is made of plywood in which a front board and a back board are glued together on the front and back sides of a core material, and the core material is a veneer made by continuously slicing coniferous wood along the circumferential direction of its outer circumferential surface. They are made by stacking them alternately at 90 degrees and bonding them together, and the top plate and back plate are made from veneers made by continuously slicing knotless logs taken from internodes of coniferous trees along the circumferential direction of their outer circumferential surfaces. a self-bonding rubber whose fibers are parallel to the short sides of the core material and between at least one stack of each of the veneers;
A damping sheet made of plastic is interposed. The above proposal has a damping effect and has attracted interest from related parties, but in the process of evaluating the above proposal, 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 does not comply with the Japanese Agricultural Standards (Showa
Revised in December 1960, hereinafter referred to as JAS. ), there are regulations for water resistance as well as strength regulations, and the water resistance grade is determined by the three levels of immersion peeling test: class 1, class 2, and class 3 below. (1) Class 1 Immersion Peeling Test For Class 1 Immersion Peeling 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.
It is further dried at a temperature of 60°C ± 3°C for 3 hours. (2) Class 2 Immersion Peeling Test For Class 2 Immersion Peeling Test, the test piece is heated at 70℃±3℃.
After soaking in warm water for 2 hours, dry at a temperature of 60°C ± 3°C for 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 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. 1-170734, the damping sheet is made of butyl rubber. and the total weight part of the ethylene-vinyl acetate copolymer and the modified polyolefin having polar groups in a ratio of 60 to 90:40 to 10, and Of the total weight parts of 40 to 10 parts by weight of modified polyolefins, less than 30 parts by weight and 7 parts by weight or more of modified polyolefins having polar groups, with the total amount being 100 parts by weight, and an average particle size of 0.8 mm to 2.0 parts by weight. mm vulcanized granular rubber
60 to 220 parts by weight were 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. When the ethylene-vinyl acetate copolymer is smaller than the above range, stagnation occurs, and when it is larger, the effect of absorbing vibrational sound (waves) cannot 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. Admar: 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 damping flooring material according to the present invention constructed as described above consists of vulcanized granular rubber dispersed in the damping sheet, butyl rubber (BR) and ethylene-vinyl acetate copolymer 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 the ethylene-vinyl acetate copolymer in the above range, appropriate hardness is imparted and tilt deformation due to long-term static loads is prevented. [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 the respective formulations. To manufacture it, first, measure each agent to make a predetermined number of parts, and add butyl rubber, recycled butyl rubber, ethylene-vinyl acetate copolymer,
Modified polyolefin resin (UBE BOND
M1000), calcium bicarbonate, zinc white, and zinc stearate were added in sequence, and after some kneading, processability imparting oil (process oil) was added and kneaded at 130℃ for 12 minutes, and the gate of the mixer was opened. The material is then dropped onto an adjustment roll to form a raw material board. 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 as follows: 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 , heat 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 plywood 2 is made of veneer 2, as shown in Figure 2a.
A, 2b, and 2c are stacked and bonded to form an integrated structure, and the fibers are alternately crossed at 90 degrees. The veneers 2a, 2b, 2c and the veneer 1
As shown in FIG. 2b, a log W of radiata pine is sliced along the circumferential direction of the outer circumferential surface, so-called "cutting". In addition, veneer 1
The slices were made from knotless logs taken from internodes so that no knots appeared on the surface. 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 mounting hole of the mount in the measurement chamber, embed putty around its periphery, and install it.
As shown in the figure, each subfloor material a was placed on the pedestal A. The floor impact sound level of this test specimen a was measured according to JAS A 1418-1978 according to the specifications shown in Figure 4.
(Method for measuring floor impact sound levels at building sites), and was conducted by the Japan Building Research Institute. The sound receiving room is a ^134m2 reverberation room.

【table】

〔effect〕

As explained above, the vibration-damping floor base material according to the present invention has the same damping effect as the conventional one, and in addition, satisfactorily passes the JAS Class 1 immersion peel test.

[Brief explanation of the drawing]

FIGS. 1a to 1c are partial perspective views of each embodiment of the vibration-damping floor underlayment material according to the present invention, FIGS. 2a and 2b are illustrations for explaining the production of plywood, FIGS. FIG. 5 is a perspective view, a schematic diagram, and a striking point diagram for explaining the test. 1, 2a, 2b, 2c...Single board, 2...Plywood,
3... Vibration damping sheet, a... Vibration damping floor base material, A...
...Trestle.

Claims (1)

[Scope of Claims] 1. A required board consisting of plywood in which a front board and a back board are integrally bonded to the front and back sides of a core material, and the core material is a veneer made by continuously slicing coniferous wood along the circumferential direction of its outer circumferential surface. are made by stacking the fibers alternately at 90 degrees and gluing them together, and the top plate and back plate are made by continuously slicing knotless logs taken from the internodes of coniferous trees along the circumferential direction of their outer circumferential surfaces. A vibration-damping flooring subfloor made of veneer sheets, the fibers of which are parallel to the short sides of the core material, and a damping sheet is interposed and self-fused to at least one overlapping portion of each veneer. In the 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 the modified polyolefin having an ethylene-vinyl acetate copolymer and a polar group, and Of the total parts by weight of the ethylene-vinyl acetate copolymer and the modified polyolefin having a polar group, from 40 to 10 parts by weight, the modified polyolefin having a polar group is less than 30 parts by weight and 7 parts by weight or more, and the total amount is 100 parts 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 are added to the same 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.