JPH04330155A - Damping floor foundation material - Google Patents

Abstract

PURPOSE:To enhance the producibility by slicing a conifer continuously. laminating the obtained veneers one over another and joining together with the fibers intersecting at right angles, preparing a matrix through mixing and kneading of respective specified amounts of rubber, resin and wood chips, setting this matrix in a die between the front and rear veneers, and consolidating them together through heating and pressurization. CONSTITUTION:Veneers produced by slicing a conifer in the circumfenetial direction at the periphery are laminated one over another and joined together while the fibers are oriented as intersecting at right angles. As matrix 3, 60-220 parts by wt. vulcanized granular rubber of particle size ranging 1.0-3.0mm, 60-90 parts by wt. butyl rubber, ethylene-vinyl acetate copolymeride, and bond are mixed together and kneaded, to which 240-640 parts by wt. wood chips are added, followed by mixing thoroughly and kneading. Thus the matrix 3 is prepared. A denatured polyolefin having polar group is added to a low density polyethylene to prepare adhesive plastic sheet 2. Then the matrix 3 is put in a die D between the front and rear veneers 1, 1 while such plastic sheets 2 are interposed, followed by heating and pressurization. Therein the total content of the copolymeride and denatured polyolefin shall be 10-40 parts by wt., among which that of denatured polyolefin be 10-30 parts by wt.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flooring material having a vibration damping effect.

0002

BACKGROUND OF THE INVENTION High-rise and apartment buildings are being constructed rapidly, and troubles caused by vibration noise in neighboring homes are occurring one after another.

[0003] As a flooring material that solves these problems,
The applicant of this application, in Japanese Patent Application No. 2-231988 etc.
We proposed a structure in which a damping sheet and particle board are interposed as a core material between wooden boards.

[0004] This product has an effective damping effect due to the damping sheet and particle board, and is also advantageous in terms of resource conservation because it uses coniferous trees that are easy to plant and grow quickly.

[0005]

[Problems to be Solved by the Invention] However, since the damping sheet and the particle board are different core materials for the vibration-damping floor base material, the above-mentioned integration was performed after each was produced separately. Therefore, there is room for improvement in terms of manufacturability.

[0006] In view of the above points, it is an object of the present invention to provide a core material that is not separate from the vibration damping sheet and the particle board, but instead is made into an integrated core material that has the vibration damping functions of both.

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, the front and back boards are made by cutting the required number of veneers made by continuously slicing coniferous wood along the circumferential direction of the outer circumferential surface of the front and back boards. The fibers are alternately crossed at 90 degrees and stacked and bonded, and the core material interposed between the front and back plates is
Required amounts of vulcanized granular rubber, heat-fusible rubber, ethylene-vinyl acetate copolymer, modified polyolefin having a polar group, and wood chips were kneaded and heated and pressurized to form an integrated product.

The above-mentioned vulcanized granular rubber has an average particle size of 1.0 to 3.
60 to 220 parts by weight as 0mm, 60 to 90 parts by weight when butyl rubber is used as the heat-fusible rubber, and the total amount of the ethylene-vinyl acetate copolymer and modified polyolefin is 1
0 to 40 parts by weight, the internally modified polyolefin is 10 parts by weight or more and less than 30 parts by weight, and the wood chips are 240 to 64 parts by weight.
It is preferable to set it to 0 parts by weight. At this time, it is preferable to mix equal amounts of vulcanized granular rubber with different average particle sizes, and recycled butyl rubber may also be used in part for the butyl rubber.
In addition, heat-fusible rubber and ethylene-vinyl acetate copolymer,
The total amount of modified polyolefin is preferably 100 parts by weight.

Modified polyolefins are adhesive resins having acetoxy groups, hydroxyl groups, carboxyl groups, ester groups, etc. represented by chemical structural formulas (I) to (IV) shown in Table 1 below, and are commercially available. Some of the brands listed include:

Dumilan: Trade name manufactured by Mitsui Polychemicals Co., Ltd. Admer: Trade name manufactured by Mitsui Petrochemical Industries, Ltd. Takemelt: Trade name manufactured by Takeda Pharmaceutical Co., Ltd. UBE BOND: Trade name manufactured by Ube Industries, Ltd.

[0011]

[Table 1]

[0012] The wood chips used are of the same quality as conventional particle boards for plywood.

[0013]

[Function] The vibration-damping flooring material according to the present invention constructed as described above has the ability to coexist with vulcanized granular rubber and ethylene-vinyl acetate due to the self-fusing properties of the heat-fusible rubber (butyl rubber) and the adhesive properties of the modified polyolefin. Polymer and wood chips together form the core material, and vulcanized granular rubber is dispersed in the core material.
Ethylene, a heat-adhesive rubber that fills the gap between wood chips
Vibratory sound (waves) is efficiently dispersed and absorbed by the vinyl acetate copolymer.

[0014]

[Embodiment] First, as shown in FIG.
It is made by stacking and gluing 0mm thick veneers 1a, 1b, and 1c into one piece, and the fibers are made to intersect alternately at 90 degrees. As shown in FIG. 6, the veneers 1a, 1b, and 1c are formed by slicing a knotless radiata pine log W from which internodes have been harvested along the circumferential direction of the outer circumferential surface, so-called "cutting".

On the other hand, the core material 3 is made of 60 to 220 parts by weight of sulfur granular rubber (average particle size 1.0 to 3.0 mm), 60 to 90 parts by weight of butyl rubber (BR), and ethylene-vinyl acetate copolymer. Combination and UBE BOND: An appropriate amount of 10 to 40 parts by weight was put into a sealed kneading machine and thoroughly kneaded. Next, an appropriate amount of wood chips: 240 to 620 parts by weight was added in several portions and kneaded. to produce core materials. At this time,
Heavy calcium carbonate, processability imparting oil, zinc oxide No. 3,
Add appropriate amounts of powdered stearic acid and paraffin flakes.

Next, as shown in FIG. 2, the back plate 1 is placed in a mold frame D (thickness: 20 mm, length: 600 mm, width: 300 mm), and an adhesive plastic sheet 2 is interposed thereon. Add core material 3, and as shown in Figure 3, 12
Under conditions of 5°C to 130°C and 8 to 10 kgf/cm2,
Heat and pressure was applied using a press plate 11 for 3.5 to 5 minutes. Next, as shown in FIG. 4, a top plate 1 is placed on top of the core material 3 with an adhesive plastic sheet 2 interposed therebetween, and heated and pressurized under the same conditions as above, to suppress vibration as shown in FIG. Flooring material A was obtained.

Note that the adhesive plastic sheet 2 includes:
For 100 parts by weight of low density polyethylene (LDPE),
A polyolefin containing 7 parts by weight or more of a modified polyolefin having a polar group was used. This sheet 2 is the veneer 1 mentioned above.
It can also be used for joining a, 1b, and 1c. In this case, heat and pressure are applied between them. In the figure, sheet 2
is clearly shown, but in reality, the core material 3 and front and back plates 1
, 1, the composition resin enters into it and it becomes shapeless.

[0018] For this vibration damping floor base material A, JIS A
Light impact sound test according to 1418 (250-2000Hz
), an improvement of 12 to 18 dB was observed.

[0019]

[Effects of the Invention] The present invention is constructed as described above, and the core material is made into an integral piece that has both the vibration damping functions of a vibration damping sheet and a particle board. This eliminates the need for integrated work, improving productivity.

[Brief explanation of drawings]

[Fig. 1] Partial perspective view of one embodiment

[Figure 2] Manufacturing explanatory diagram of the same example

[Figure 3] Manufacturing explanatory diagram of the same example

[Figure 4] Manufacturing explanatory diagram of the same example

[Figure 5] Manufacturing explanatory diagram of the same example

[Figure 6] Manufacturing explanatory diagram of the same example

[Explanation of symbols]

1 Wooden board material 1a, 1b, 1c veneer 2 Adhesive plastic sheet 3 Heartwood (heart material) A. Vibration damping flooring material D　Mold frame

Claims (2)

[Claims] 1. A flooring material made of plywood in which a top plate and a back plate are integrally bonded to the front and back surfaces of a core material, wherein the top plate and the back plate are made by continuously slicing coniferous wood along the circumferential direction of its outer circumferential surface. The required number of sheets of veneer are stacked and bonded with their fibers intersecting alternately at 90 degrees, and the core material is made of vulcanized granular rubber, heat-fusible rubber, ethylene-vinyl acetate copolymer, polar 1. A vibration-damping flooring material, characterized in that it is made by kneading required amounts of a modified polyolefin having a group-containing group and wood chips, and integrating the mixture by heating and pressurizing the mixture. Claim 2: The vulcanized granular rubber has an average particle size of 1.0 to
60 to 220 parts by weight as 3.0 mm, 60 to 90 parts by weight of butyl rubber as the heat-fusible rubber, and 10 to 40 parts by weight of the ethylene-vinyl acetate copolymer and modified polyolefin in total. Modified polyolefin is 10
Parts by weight or more and less than 30 parts by weight, the above wood chips are from 240 to
The vibration-damping flooring material according to claim 1, characterized in that the content is 640 parts by weight.