JPH0649361B2 - Vibration control and soundproofing material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a vibration damping and sound absorbing material used for damping and soundproofing building materials and auxiliary equipment for homes and the like, home electric appliances, automobiles and the like.

[Prior Art] In recent years, noise in the housing environment, especially troubles between neighbors due to partition walls of apartments or vibration between upper and lower floors has become a social problem.

In addition, there is a growing demand to improve the living environment by suppressing these noises in household electric appliances such as washing machines, refrigerators, and vacuum cleaners equipped with rotating equipment used in homes, and in the interior of automobiles. Development is in progress.

Among them, looking at houses, in order to prevent vibration of walls, floors, ceilings, etc. of conventional ordinary houses, condominiums, etc.
Rubber-based damping materials, as typified by damping rubber, are the mainstream of those that are used by being bonded to building materials such as gypsum boards for walls, plywood for flooring materials, and steel plates. However, the thicker the rubber-based vibration damping material is, the more vibration damping effect is recognized, but the higher the price is, and there is a problem that the living space becomes narrower when it is used for the interior of a house. The rigidity is lost, and vibration cannot be damped even when it is attached to a building material. In addition, thermoplastic resin sheets, non-woven fabrics, foamed resin sheets and the like which are used by being attached to building materials are also known, but almost no material having both vibration damping and soundproofing has been found.

In recent years, it has been proposed that the paperboard is pasted with an emulsion-based adhesive such as an acrylic synthetic rubber adhesive and adhesively laminated, but it is difficult to emulsify a resin with sufficient damping performance, and the damping performance is improved. In order to do this, a large amount of emulsion adhesive must be applied, and a large amount of water remains in the paper layer, causing problems such as "mold" and reducing the rigidity of the paper. It was

[Problems to be Solved by the Invention] An object of the present invention is to solve the above-mentioned problems and to provide a vibration damping and soundproofing material composed of a paperboard having both damping and soundproofing properties and a specific adhesive.

[Means for Solving the Problems] The present invention is a vibration damping and soundproofing material, characterized in that at least one of the adhesives between the layers of paperboard is a hot-melt adhesive.

As the paperboard used in the present invention, a paperboard having a large thickness is used, and for example, one having a basis weight of about 250 to 650 g / m ² is preferable. Alternatively, a pulp board to which paperboard is already attached may be used.

A hot melt adhesive is used as the adhesive.
As the hot melt adhesive, known ethylene-vinyl acetate copolymer, styrene copolymer, polyethylene,
For base polymers such as polyamide, nylon, polyester, polypropylene, etc., tackifiers, plasticizers, softeners,
A filler, a wax, and an anti-softening agent are appropriately mixed and used.

The hot melt adhesive used in the present invention has a loss elastic modulus (G ″) of 10 ⁴ to 10 ⁹ dyne / c based on the results of studies by the present inventors.
It was found that the use of a hot-melt adhesive having m ² and a loss tangent (tan δ) of 0.3 to 3.0 and a peak value close to the operating temperature range effectively absorbs the vibration strain. Among the above base polymers, those using styrene-isoprene-styrene copolymer or atactic polypropylene as the base polymer are preferable.

The hot melt adhesive used for the vibration damping and soundproofing material of the present invention,
The transition region was selected so as to match the operating temperature range, and the glass transition temperature (Tg) was also set within the operating temperature range. However, the loss elastic modulus (G ″) and loss tangent (tan δ) should have no sharp peaks in the operating temperature range. In the transition region, the polymer of the hot-melt adhesive component is macroscopic in the main chain and side chains. Alternatively, it is possible to absorb vibration energy while making micro-entanglement.

In addition, unlike emulsion-based adhesives, hot-melt adhesives do not cause migration of water into the paper layer after the adhesive is applied and the rigidity of the paper does not decrease, and vibration of the hot-melt adhesive layer does not occur. It is considered that the energy absorption capacity and the vibration energy absorption capacity of the paperboard match to give a good vibration damping and soundproofing effect.

Various laminated structures of the vibration damping and soundproofing material of the present invention are conceivable. For example, the following layered structures are basically considered.

Paper / HM / Paper / EM / Paper / HM / Paper Paper / PE / Paper / HM / Paper / PE / Paper Paper / HM / Paper Paper: Paperboard, HM: Hot melt adhesive EM: Emulsion adhesive, PE: Polyethylene In addition to polyethylene, a highly rigid laminate resin such as polypropylene, polyethylene terephthalate, polymethylpentene, or a film is used for the PE layer.

The amount of hot-melt adhesive used is at least 50 μm thick
The above is necessary. Building materials such as plywood, gypsum board, and steel plates are laminated and used on one side or both sides of the vibration damping and soundproofing material in which these paperboards are laminated.

[Examples] Examples of the present invention will be shown below.

Example 1 ^Two paperboards having a basis weight of 300 g / m ² were pasted together by using a hot melt adhesive having a styrene-isoprene-styrene copolymer resin as a base polymer so as to have a thickness of 60 μm, and separately. The laminated two laminated paperboards were adhered with a styrene-acrylic copolymer resin emulsion (thickness 20μm after drying) to form a damping material layer, and a thickness of 9 on the top surface of the four laminated paperboards.
mm vibration plywood and plywood with a thickness of 3 mm on the lower surface were each bonded with an adhesive to obtain a vibration damping and soundproofing material of the present invention.

The viscoelasticity of the hot melt adhesive used here has a loss modulus (G ″) of 4 × 10 ⁶ dyne / cm ² at 5 ° C. and 8 × at 20 ° C.
10 ⁵ dyne / cm ² , loss tangent (tan δ) 1.7, 20 at 5 ℃
It was 0.7 at ℃. The glass transition temperature (Tg) was -0.5 ° C.

Comparative Example 1 A vibration damping and soundproofing material was prepared in the same manner as in Example 1 except that the styrene-butadiene copolymer latex emulsion was used in place of the hot melt adhesive in the pasting of two paperboards. Obtained.

Example 2 Two sheets of paperboard having a basis weight of 600 g / m ² were used in Example 1, and 2
The thickness of the hot melt adhesive used for laminating two sheets of paperboard 1
A vibration damping and soundproofing material of the present invention was obtained in exactly the same manner as in Example 1 except that the thickness was 20 μm.

Example 3 ^Two paperboards having a basis weight of 280 g / m ² were laminated by a polyethylene extrusion laminate having a thickness of 40 μm, and separately laminated in the same manner 2
A sheet of laminated paperboard was laminated using a hot-melt adhesive containing a styrene-isoprene-styrene copolymer as a base polymer so that the thickness of the adhesive was 60 μm, laminated, and then the same procedure as in Example 1 was performed. Then, a plywood was attached to the lower surface to obtain the vibration damping and soundproofing material of the present invention.

Example 4 ^Two paperboards having a basis weight of 600 g / m ² were laminated and laminated so that the thickness of the hot melt adhesive was 60 μm, and plywood was laminated on the upper and lower surfaces in the same manner as in Example 1 below. The vibration damping and soundproofing material of the present invention was obtained.

Comparative Example 2 In Example 4, except that ^two paperboards having a basis weight of 600 g / m ² were replaced with a hot melt adhesive and a polyacrylic ester emulsion adhesive (60 μm in thickness after drying) was used for lamination and lamination. In the same manner as in Example 4, a vibration damping and soundproofing material was obtained.

Example 5 Damping of the present invention was carried out in the same manner as in Example 1 except that a hot melt adhesive containing a styrene-butylene-styrene copolymer resin as a base polymer was used as the hot melt adhesive. I got a soundproof material.

The viscoelasticity of the hot melt adhesive used here has a loss elastic modulus (G ″) of 4.3 × 10 ⁶ dyne / cm ² at 5 ° C and 9.1 at 20 ° C.
× 10 ⁵ dyne / cm ² , loss tangent (tan δ) 1.3, 20 at 5 ℃
It was 0.5 at ° C. The glass transition temperature (Tg) is -4.8 ° C.
Met.

Tables show the results of measuring the loss coefficient representing the vibration damping and soundproofing effect of the vibration damping and soundproofing materials obtained in the above Examples and Comparative Examples.

Loss coefficient test method With respect to the vibration damping and soundproofing materials obtained in Examples and Comparative Examples, the loss coefficient was measured by changing the frequency by the mechanical impedance method.

The larger the value of the loss coefficient, the greater the vibration damping and soundproofing effect.

The level of the loss coefficient value varies depending on the laminated material and layer structure used.

Loss modulus (G ″), loss tangent (tan δ) measuring method For coating film of hot melt adhesive, using Dynamic Analyzer RDA-700 (Rheometrics Far East Co., Ltd.), measuring frequency of 1HZ, -50 ℃ ~
It was measured in the temperature range of 100 ° C.

According to the results shown in the table, the vibration-damping and sound-proofing materials of Examples 1 and 4 using the hot-melt adhesive as the adhesive in the paperboard lamination of the present invention are Comparative Example 1 using the conventional emulsion adhesive. The loss factor is larger than 2 and the vibration damping and soundproofing effect is excellent. In addition, the vibration damping and soundproofing effect of Example 5 using the hot melt adhesive of Example 1 and another hot melt adhesive is also superior to that of Comparative Example 1 using the conventional emulsion adhesive.

In addition, the thicknesses of the paperboard and the hot melt adhesive are set to those in Example 1.
The loss factor of Example 2 which is twice as thick as
It is more than doubled and the vibration damping and soundproofing effect is significantly improved.

Furthermore, even if polyethylene is used for laminating two paperboards as in Example 3, by adhering both laminated paperboards with a hot melt adhesive, an excellent vibration damping and soundproofing material can be obtained.

The loss coefficient of the plywood alone was 0.002 or less in each frequency range shown in the table, but the one using the vibration damping and soundproofing material of the present invention shows a good loss coefficient. .

[Advantages of the Invention] The vibration damping and soundproofing material of the present invention has a vibration damping and soundproofing effect superior to that of the conventional boardboard-laminating type vibration damping and soundproofing material by using the hot-melt adhesive as the adhesive for laminating the paperboard. A soundproofing material could be obtained.

As a result, it provides a vibration damping and soundproofing material that has excellent vibration damping and soundproofing properties that eliminate the problems of conventional damping materials such as rubber damping rubber, building materials such as houses and other home equipment, home electric appliances,
It can be used in automobiles, etc., and can exert the effect of damping and soundproofing.

Claims (1)

[Claims] 1. A vibration damping and soundproofing material, characterized in that at least one of the adhesives between layers of paperboard is a hot-melt adhesive.