JPH0572866B2 - - 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 controlled flooring material in Japanese Patent Application No. 1-170735. This method involves interposing 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 with their fibers crossing each other. "Let it happen." 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. Note (l) Class 1 immersion peel test Class 1 immersion peel test is performed by immersing the test piece in boiling water for 4 hours and then 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 2 Immersion Peeling Test, test pieces are 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 problem 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 the polyisobutylene rubber and the modified polyolefin having a polar group are
The ratio is 60 to 90:40 to 10, and out of the total weight part of the polyisobutylene rubber and 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 5 parts by weight or more. Then, the total amount was set to 100 parts by weight, and 60 to 220 parts by weight of vulcanized granular rubber having an average particle size of 0.8 mm to 2.0 mm were added and kneaded to form a sheet. When the above-mentioned butyl rubber is smaller than the above-mentioned 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 polyisobutylene rubber is smaller than the above range, it will sag, and if it is larger, it will not be able to absorb vibrational sound (waves). 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]

In the vibration-damping flooring material of the present invention constructed as described above, vibration noise is produced by the vulcanized granular rubber dispersed in the vibration-damping sheet and the butyl rubber (BR) and polyisobutylene rubber filling the gaps. (waves) are 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 polyisobutylene rubber in the above range, appropriate hardness is imparted and tilt deformation due to long-term static loads is prevented.

【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 drawings]

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 polyisobutylene rubber and modified polyolefin having a polar group, and Of the total parts by weight of rubber and modified polyolefin having polar groups from 40 to 10, the modified polyolefin having polar groups is less than 30 parts by weight and 5 parts by weight or more, and the total amount is 100 parts by weight, and the average particle size is A vibration-damping floor base material, characterized in that 60 to 220 parts by weight of vulcanized granular rubber having a diameter of 0.8 mm to 2.0 mm is added and kneaded to form a sheet. 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.