JPH0366717A - Vibrationproof and soundproof polymer material - Google Patents

Abstract

PURPOSE:To obtain the subject material excellent in vibrationproof and soundproof properties and shape stability over a wide temperature range from low to high temperatures by bringing an acrylic polymer into contact with a styrene- based monomer and then subjecting the resultant mixture to polymerization. CONSTITUTION:The objective material composed of a polymer substance obtained by bringing an acrylic polymer into contact with a styrene-based monomer (e.g. styrene or alpha-methylstyrene) and then subjecting the resultant mixture to polymerization or further converting the formed polymer into an interpenetrating polymer network(IPN).

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a polymer material for vibration and sound insulation.

(Conventional technology) Traditionally, vehicles, ships, automobile parts, equipment, various machines,
In order to prevent vibrations and accompanying noise on the back side of structural members such as building materials and acoustic materials, the members themselves may be made thicker or! [In addition to preventing it by making improvements to itself,
The prevention of this problem is being done by using a dissonant material. Various materials have been proposed for use in these materials.

For example, rubber, resin, asphalt, etc. mixed with inorganic fillers such as graphite, carbon black, mica, asbestos, calcium carbonate, talc, metal powder, etc. are well known.

In these cases, vibration damping materials that mainly contain asbestos may have the effect of preventing noise caused by vibrations, that is, damping properties, but because of their small specific gravity, they may lack the effect of preventing sound radiation, that is, sound insulation properties; Sound insulation materials that mainly contain metal powder have been unsatisfactory because they lack vibration distribution even if they have sound insulation properties6.Furthermore, when installing sound insulation materials directly to the above-mentioned mechanical equipment that generates vibration and noise, Yes, that's 80~
Since the temperature rises to as high as 120°C, the use of the above materials is extremely limited because their vibration properties deteriorate at high temperatures, or the material itself softens and its shape retention deteriorates.

(Problems to be Solved by the Invention) An object of the present invention is to provide a polymeric material that has excellent vibration-proofing properties, sound-proofing properties, and morphological stability over a wide temperature range from low to high temperatures6. The purpose of is processability, transparency, heat resistance, weather resistance,
Our objective is to provide a polymeric material for vibration and sound insulation that has excellent chemical resistance, oil resistance, solvent resistance, water resistance, water and oil resistance, abrasion resistance, nonflammability, etc., as well as excellent vibration and sound insulation performance. .

(Means for Solving the Problems) The present invention provides an anti-vibration material comprising a polymer material obtained by bringing an acrylic polymer into contact with a styrene monomer and then subjecting it to polymerization or further converting it into IPN. Relating to polymer materials for soundproofing.

In the present invention, commonly known acrylic polymers can be used, such as single or copolymers of the following acrylic monomers.

The type of acrylic mo/mer is not limited, but mono- or polyfunctional ones are included, and preferably, for example, methyl methacrylate (MMA), ethyl methacrylate (E
M A ), butyl methacrylate (BMA), 2-hydroxyethyl methacrylate (HEMA), 3-()rimethoxysilyl)propyl methacrylate (MSPM>
, 2-(phenylphosphoryl)ethyl methacrylate (
phenyl-P), 2-hydroxy-3-(β-
(s7toxy)propyl methacrylate (HNPM), N
-phenyl-N-(2-hydroxy-3-methacryloxy)propylglycine (NPC-GMA),
Ethylene glycol dimethacrylate (EDMAI or IG), diethylene glycol dimethacrylate (Di
EDMA), triethylene glycol no methacrylate (TriEDMA), 1,4-butanediol/tacrylate) (1,4-BuDMA), 1,3
-butanodiolnomethacrylate (1,3-Bu
DMA), 2,2-bis[4-(2-hydroxy-3-methacryloxypropoquine)phenyl]propane (Bis-GMA), 2,2-bis(4-methacryloxyphenyl)propane (BPDMA) , 2,2-bis(
4-Methacryloxyethoxyphenyl)propane (Bi
s MEPP), 2,2-bis(4-methacryloxypolyethoxyphenyl)propane (Bis-MPEPP)
), (methacryloxyethyl)trimethylhexamethylene diurethane (UDMA), trimethylolpropane (TMPT), CH2=C(CHff)COOCH2CF, (3F
MA), Cl2=C(Cll,)COOCH2CF2C
F3 (5FMA), CH2=C(CL)COOCL
(CFzLCFi (7FMA), CIl, =C(C
H,) COOCH, (CF2), CFJ (8FMA
), their corresponding acrylates, and a-fluoroacrylates.

In addition, all commonly known styrene monomers can be used, and specific examples include styrene, α-methylstyrene, methylstyrene, dichlorostyrene, etc. alone or in combination with 7-crylonitrile, phthadiene, ethylene glycol dimethacrylate, etc. (IG), 1.4-
Butanediol dimethacrylate (1,4-BuD
M A ), diethylene glycol dimethacrylate (
DiEDMA), triethylene glycol dimethacrylate (TriEDMA), 1,3-butanediol dimethacrylate (1,3BuDMA), 2,2-bis(4
-(2-hydroxy-3-methacryloxypropoquine)
Examples include mixtures with phenyl]propane (Bis-GMA), trimethylolpropane trimethacrylate (TMPT), and the like.

In the present invention, a polymer substance is obtained by bringing the acrylic polymer into contact with a styrene monomer and then subjecting it to polymerization. At this time, when the acrylic polymer is brought into contact with a styrene monomer, the former usually The latter dissolves or swells in the former, or the latter impregnates the former. In addition, as the polymerization method, a known polymerization method for styrene monomers can be adopted, but photopolymerization,
Thermal polymerization is preferred.

In the present invention, when the polymerization reaction is carried out by heat polymerization, for example, by heating at a temperature of about 40 to 100°C for about 150 minutes, or when carried out by photopolymerization, for example, by irradiating with visible light or ultraviolet light for several minutes. It is preferable to polymerize for several tens of minutes.

As the polymer material for vibration and sound insulation of the present invention, the above-mentioned polymer material is
ing Polymer Network) is also included. ■PN is a polymer that is originally formed by mixing 2'11 chain polymers in a liquid state (a solution is possible), crosslinking both or one of them, and intertwining the molecular chains with each other. When this method is used in the present invention, several irregular methods are used.For example, the first method is to form a polymer material into a film in advance,
The monomer that forms the guest polymer is injected into this in a gas phase, or the film is immersed in a solution containing the monomer, injected, and then polymerized or crosslinked by heating or light irradiation. be. The second method is to dissolve the polymer material in a suitable solvent, mix and react with the dust component, and cast the solution to form a film. This method involves heat treatment, etc. Other methods may also be used.

In order to proceed with IPN formation, it is necessary to carry out crosslinking, and this can be done, for example, by using a styrene polymer that has been crosslinked in advance by a conventional method, or by using a difunctional or higher functional acrylic monomer. , a method of obtaining a crosslinked polymer by polymerization, or post-crosslinking the obtained uncrosslinked polymer using a method suitable for the polymer using a radical source such as an organic peroxide, radiation, an ionic compound, an ion source, etc. can be mentioned. In addition, a polymer blend of a polymer obtained by polymerizing the styrene monomer of the present invention and an acrylic polymer can also be used as the vibration/soundproof polymer material of the present invention.

The polymeric substance used in the present invention has processability, transparency, heat resistance, weather resistance, chemical resistance, oil resistance, solvent resistance, water resistance,
It has excellent water resistance, abrasion resistance, and nonflammability, as well as excellent vibration and soundproofing properties.

The polymer material of the present invention can be produced by molding the polymer substance obtained above into a desired shape by extrusion molding, injection molding, compressing molding, etc., or by dissolving or dispersing it in an appropriate solvent and making it into a paint. After forming into the desired form, it is used for the purposes described below. At that time, fillers, reinforcing agents,
Even if rubber and plastic compounding agents such as softeners, plasticizers, compatibilizers, crystal nucleating agents, anti-aging agents, antioxidants, anti-ozonants, ultraviolet absorbers, pigments, dyes, and tackifying resins are added. good.

The vibration/sound insulating polymer material of the present invention can be used as a vibration/sound insulating material for ceilings, floors, side walls, bonnets, etc. of various S vehicles such as automobiles, trains, airplanes, and ships, as well as other construction machines,
For various noise sources in industrial machinery such as agricultural machinery and civil engineering machinery, as well as in factories such as metal processing machines, ducts, hoppers, and chutes, as well as roofs (especially iron roofs), ceilings, floors, and walls in residences and offices. noise sources, as well as various office machines such as computers and printers, various home appliances such as air conditioners, washing machines, and vacuum cleaners, and sound systems such as V-stereos and record players, pianos, and organs. It is widely used for such things as

(Example) Examples will be described below.

Example 1 For 4 g of styrene monomer (St), 0,
Dissolve 5 wt% of can7archine (CQ) and dimethylaminoethyl methacrylate (DMAEMA),
Furthermore, 4 g of polyethyl methacrylate (PEMA) was dissolved and homogenized in this, and then visible light was irradiated for photopolymerization.

The Vickers hardness of the obtained polymer material was 17.6HV (
25°C). Further, the density measured by the density gradient method at 20°C was 1.10 g/0 m3. Also, Shimadzu Thermal Analyzer DT-30
The pyrolysis gas generation onset temperature (TD) was measured at a temperature increase rate of 10°C/min in a nitrogen atmosphere using a pyrolysis gas of 280°C.

Incidentally, there was a weight decrease of about 3 to 4% at 139°C. P
The TD of the EMA was 219°C, and there was a weight loss of about 3 to 4% at 149°C.

Note that in order to exhibit the sound and vibration damping function, the material needs to have the property of effectively converting vibrational energy into thermal energy and dissipating it. As a guideline for the conversion rate of vibrational energy to thermal energy, t can be obtained by measuring the dynamic tensile modulus.
An example is anδ.

The larger the jan δ value, the higher the conversion rate. Therefore, the soundproofing and vibration-proofing properties were evaluated by the value of tan δ.

jan δ and dynamic tensile modulus (E゛) were measured using a bipron manufactured by Orientic Co., Ltd., at a heating rate of 2°C/min and a frequency of 3.
．． Measurement was performed under the condition of 5 Hz. The results are shown in Table 1.

Table 2 Example 2 0.5 t% of CQ and DMAEM, respectively, for a mixture of Si2,5 g and 1,4-butanediol dimethacrylate (1,4-BuDMA) o, sg.
After dissolving A and further dissolving 5 g of PEMA therein and homogenizing the solution, visible light was irradiated for 10 minutes to photopolymerize.

The tan δ and (/E') of the obtained polymeric material were measured in the same manner as in Example 1, and the results are shown in Table 2.

(that's all) Daikin Industries, Ltd.

Claims (1)

[Claims] (1) A polymeric material for vibration and soundproofing characterized by comprising a polymeric substance obtained by bringing an acrylic polymer into contact with a styrene monomer and then subjecting it to polymerization or further converting it into IPN.