JPH04330157A - Damping floor foundation material - Google Patents

Abstract

PURPOSE:To enhance the producibility by joining a front ligneous veneer and rear ligneous veneer of wooden type, preparing a heart wood to be interposed between the two ligneous veneers through mixing and kneading of respective specified amounts of rubber, resin, and wood chips, and consolidating them together through heating and pressurization. CONSTITUTION:As heart wood 3, 60-220 parts by wt. vulcanized granular rubber of particle size ranging 1.0-3.0mm, 60-90 parts by wt. butyl rubber, polyethylene, and bond are put enclosedly, 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 heart wood 3 is put in a die D between ligneous veneers 1, 1 while such plastic sheets 2 are interposed, followed by heating and pressurization to accomplish a consolidates structure. Therein the constituent resin intrudes into the heart wood 3 and ligneous veneers 1, 1, and the total content of the polyethylene and denatured polyolefin is 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. 2-231983 etc.
We proposed a structure in which a damping sheet and particle board were interposed as a core material between wood veneers.

0004

[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, they have been manufactured separately and then integrated. Therefore, there is room for improvement in terms of manufacturability.

[0005] 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 is made into an integrated core material that has the vibration damping functions of both.

[0006]

[Means for Solving the Problems] In order to solve the above problems, in the present invention, the core material interposed between the wood veneers is made of vulcanized granular rubber, heat-fusible rubber, polyethylene, or Required amounts of the modified polyolefin having the group and wood chips were kneaded and heated and pressurized to form an integrated product.

[0007] The above-mentioned vulcanized granular rubber has an average particle size of 1.0 to 3.
60 to 220 parts by weight as 0 mm, 60 to 90 parts by weight when using butyl rubber as the heat-fusible rubber, and a total of 10 to 40 parts by weight of the polyethylene and modified polyolefin, in which the modified polyolefin is 10 to 30 parts by weight. Less than 240 to 640 parts by weight of the wood chips. At this time, it is preferable to mix equal amounts of vulcanized granular rubber with different average particle sizes, and it is also possible to use recycled butyl rubber in part for the butyl rubber, and heat-fusible rubber, polyethylene, and modified polyolefin. It is preferable that the total amount is 100 parts by weight.

[0008] 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.

0010

[Table 1]

[0011] The wood chips used are of the same quality as conventional particle boards for plywood.

0012

[Function] The vibration-damping flooring material according to the present invention constructed as described above has the ability to adhere to vulcanized granular rubber, polyethylene, and wood chips due to the self-bonding properties of the heat-fusible rubber (butyl rubber) and the adhesive properties of the modified polyolefin. Together they form the heartwood,
Vibration sound (waves) is efficiently dispersed and absorbed by the vulcanized granular rubber and wood chips dispersed in the core material, and the heat-fusible rubber and polyethylene (PE) that fill the space between them.

[0013]

[Example] First, vulcanized granular rubber (average particle size 1.0-3.
0mm): 60 to 220 parts by weight, butyl rubber (BR):
60~90 parts by weight, PE and UBE BOND: 10~
An appropriate amount of 40 parts by weight is charged into a sealed kneading machine and thoroughly kneaded, and then an appropriate amount of 240 to 620 parts by weight of wood chips is added in several portions and kneaded to produce a core material. At this time, appropriate amounts of heavy calcium carbonate, processability imparting oil, zinc white No. 3, powdered stearic acid, and paraffin flakes are added.

Next, as shown in FIG. 2, a 3.3 mm wood veneer 1 is placed in a mold frame D (thickness 20 mm, length 600 mm, width 300 mm), and an adhesive plastic sheet is placed on top of it. 2, the core material 3 is introduced, and the
As shown in 125℃~130℃, 8~10kgf/
cm2, and was heated and pressed for 3.5 to 5 minutes using a press plate 11. Next, as shown in FIG. 4, a wooden veneer (
3.3 mm thick) 1 was placed and heated and pressurized under the same conditions as above to obtain a vibration-damping floor base material A shown in FIG. 1.

[0015] 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. Although this sheet 2 is clearly shown in the drawing, in reality, its composition resin enters into the core material 3 and the wooden veneers 1, 1, and the sheet 2 becomes shapeless.

[0016] 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.

[0017]

[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

[Explanation of symbols]

1 Wood 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 front and back boards of wood veneers are integrally bonded to the front and back surfaces of the core material, wherein the core material is made of vulcanized granular rubber, heat-fusible rubber, polyethylene, polar 1. A vibration-damping flooring material, characterized in that it is made by kneading required amounts of a modified polyolefin having a polyolefin 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, 10 to 40 parts by weight of the polyethylene and modified polyolefin in total, and 10 parts by weight of the modified polyolefin. 2. The damping flooring material according to claim 1, wherein the content of the wood chips is 240 to 640 parts by weight.