DE10218607B4 - Vibration-damping material - Google Patents

Abstract

use a polymer or synthetic resin dispersion in the form of an aqueous silicone resin emulsion, the at least one mineral filler, water and additionally one Ammonium salt of a mono-, bi- or trivalent organic carboxylic acid with up to 12 carbon atoms or their mixed salts with polyvalent ones Metal ions or an ammonium salt of a mono-, bi- or trivalent inorganic acid contains as vibration damping Material.

Description

The The invention relates to a new use of a polymer or synthetic resin dispersion in the form of an aqueous silicone resin emulsion, the further at least one mineral filler, water and additionally Ammonium salt of a mono-, bi- or trivalent organic carboxylic acid with up to 12 carbon atoms or their mixed salts with polyvalent ones Metal ions or an ammonium salt of a mono-, bi- or trivalent inorganic acid contains.

In indoors of motor vehicles, railways or aircraft are at their Locomotion and generator housings or other devices with easy to vibrate excitable parts are in their operation often generates vibrations in the prior art. Such Vibrations generate as annoying roar audible Noise. These affect z. B. in motor vehicles, especially in passenger cars, for music lovers unfavorable because they negatively affect the acoustics in the passenger compartment.

The disturbing Vibrations can arise from the fact that radio and music systems, such as cassette players and CD players, which are in the Dashboard have been used, albeit a small game in the opening have that for the insertion of these devices is provided. The result of moving the vehicle or airplane so in the opening Vibration of the device housing, which including the annoying ones noise cause. Furthermore Speakers are located in the front and / or rear of the vehicle interior installed, which also in the designated recesses have a low game.

Also such vibrating parts, which are more likely in the trunk, contribute to the training of disturbing background noise due to vibrations.

Yet major inconvenience can generally due to vibrations of housings and other loose or easily vibrated parts of any devices generated noise prepare. Fan housings and ventilation ducts should be mentioned here by way of example.

From that Based on the present invention, this task disturbing To effectively prevent vibrations and the associated background noises.

Is solved this task by the use of a polymer or synthetic resin dispersion in the form of an aqueous silicone resin emulsion, the at least one mineral filler, water and additionally an ammonium salt a mono-, bi- or trivalent organic carboxylic acid with up to 12 carbon atoms or their mixed salts with polyvalent ones Metal ions or an ammonium salt of a mono-, bi- or trivalent inorganic Contains acid, as such a vibration-damping material. In addition, at least one foaming agent and / or a foam stabilizer.

Examples for the mono-, bi- or trivalent organic carboxylic acid having up to 12 carbon atoms Formic, acetic, propionic, tartaric and oxalic acid. As the ammonium salt of a mono-, bi- or trivalent inorganic acid come z. For example ammonium chloride, nitrate, sulfate or phosphate and as metal ions e.g. B. such zirconium, titanium, zinc and / or aluminum.

In the prior art are by the GB-B-1 239 554 In general, rubber latex foams have become known, to which a polysiloxane is added in their preparation. For gelation, a zinc oxide-containing ammonium acetate is further used in their preparation. However, the use according to the invention is not disclosed there.

Besides, they are the invention used Materials in the art already as adhesive and filler for thermal insulation composite systems become known and according to the invention a new use as antivibration Material supplied.

at Thermal insulation systems, which serve to insulate building exterior walls, is the masonry of the building exterior walls with thermal insulation panels covered. On the insulation boards will follow applied a multi-layer plaster, which consists of a reinforcing layer, formed from a reinforcing compound and a reinforcing fabric, and a topcoat, e.g. B. a synthetic resin plaster exists.

The thermal insulation panels themselves are applied to the masonry by means of an adhesive and filler compound applied. The adhesive and putty also serves to compensate for unevenness in the masonry. This is especially important in the renovation of old buildings.

When therefor suitable adhesive and putty are in the prior art All used cementitious glue, which applied in thicker Allow layers to compensate for the aforementioned bumps. But there are also cementless, plastic-bound adhesive and Spachtelmassen used. These are basically made of one aqueous polymer or synthetic resin dispersion, mineral fillers and water together. additionally contain these plastic-bound adhesives and fillers in usually aids. These include Dispersing, thickening, film-forming and preservative agents. To the use of these adhesives and fillers cheaper to design, is also proposed in the prior art, the Dispersions in foamed Apply form. Then they are usually foaming and, where appropriate Added foam stabilizers. But the foaming can also be effected by compressed air, with the addition of a foaming agent deleted and optionally only a foam stabilizer is added.

at from the field of thermal insulation systems known materials are the ammonium salts contained therein used to be a favorable even at low temperatures To achieve bonding behavior. It has now been found that such kind composite materials particularly successful vibration damping than Entdröhnmasse can be used.

With respect to the inventive use is by the JP-A-06041499 Already a polymer foam made of (meth) acrylate monomers became known, which is mixed with ammonium stearate and used in mechanically foamed form for vibration damping. Polymer or synthetic resin dispersions in the form of silicone resin emulsions are not disclosed.

Out Chemical Abstracts # CA: AN: 135: 138285 are Japanese studies where the vibration damping properties of commercially available Adhesives were checked. It is reported that the Most known adhesive at low temperatures good vibration damping Have properties, with the exception of acrylate emulsions and Silicone-based adhesives.

ammonium salts of mono-, bi- or trivalent organic carboxylic acids, optionally as mixed salts with polyvalent metal ions, or of mono-, bi- or trivalent inorganic acids as additives to the adhesives are not disclosed.

The GB-B-884 573 refers to vibration damping compositions based on thermoplastic binders in the form of copolymers of a selected vinyl ester of a carboxylic acid with an unsaturated aliphatic hydrocarbon containing as additional ingredients mineral fillers such as mica, kaolin, barite, chalk and graphite.

From the US-A-4,391,857 are known vibration damping aqueous polymer dispersion in the form of a vinyl acetate emulsion and an ethylene polymer, which also contain as a further ingredient a platelet-shaped mineral filler, such as mica.

By the use according to the invention the polymer or synthetic resin dispersion in the form of aqueous silicone resin emulsions together with an ammonium salt can be generated by vibrations noise in the vehicle, railway and wagon, aircraft, ship, plant and apparatus area, in generator and fan housings, ventilation ducts and Other devices with easily stimulated to vibrate parts effectively suppressed become.

in the The following are the advantages of using the material according to the invention described using the example of music systems in passenger vehicles, because they can be represented here particularly vividly. It is but easily seen that this Choice of representation only has exemplary character. The Advantages of vibration damping or deadening can easy for too the other devices and uses mentioned, for. B. at Generators, can be viewed.

It has been shown that the Vibrations and the associated background noises are effectively prevented can, if the vibration-damping Material on the surfaces is applied, which come into contact with the housing of the respective sound reproduction devices or can come. By the suppression the vibration will be a sound enhancement of the speakers, one Improvement of the sound volume and thus an optimization of the whole Achieved acoustics in the driving or aircraft interior.

The antivibration Material advantageously adheres to any surface, in a driving or aircraft interior or other devices is encountered, such. B. on plastic, wood or sheets any metals or alloys, being particularly galvanized Sheets of chrome steel and brass are to be mentioned. If necessary for smooth metallic or alloy surfaces, a slight pretreatment in the form of a roughness of the surface required.

It was also the bending strength when applied to such sheets, in particular galvanized steel sheets, examined and dependent on the applied layer thickness a good to excellent bending strength detected.

to Achieving these advantages is the polymer or synthetic resin dispersion an aqueous silicone resin emulsion. These dispersions or emulsions act in the vibration damping Material as a binder. The material is therefore plastic bound.

The antivibration Contains material at least one mineral filler, which is selected calcium carbonate, silica, talc and mixtures from that. As a suitable calcium carbonate here comes the finely crystalline Shape of the marble. Here is preferably silica to call, the fine crystalline used as fine quartz flour or coarser can be. It has even been found in experiments that when increasing the Grain sizes one better vibration damping could be achieved.

According to one another embodiment the vibration-damping material may additionally contain auxiliaries, the selected are from dispersing, thickening, film forming and preservatives and their combinations. These aids are as such in the state known to the art.

The Known adhesive and filler usually contain in addition so-called White pigments or other coloring additives. These are for the use according to the invention the masses as vibration damping material neither required still a hindrance.

For a simplified and also material-saving application of the vibration-damping material becomes this in foam form on the surfaces applied. It may additionally to the foaming agent contain a foam stabilizer. The foaming but can also be solely by the application of compressed air with the addition a foam stabilizer can be achieved.

When Foaming agents are polymers of ethylene and propylene oxide, Alkyl diglycol ether sulfate sodium salt, sodium lauryl sulfate or nonionic Surfactants, such as fatty alcohol ethoxylates into consideration. A regulation The foaming can further by silicone oils and through Addition of a foam stabilizer in the form of z. For example, sodium sulfosuccinamate respectively.

in the Following, the invention will be explained in more detail by way of examples.

For installation a car radio into the dashboard of a motor vehicle antivibration Materials of the compositions given below used. In these materials, the polymer dispersion is an acrylate dispersion or according to the invention, a silicone resin emulsion used, which serves as a binder. Suitable acrylate dispersions are commercially available. A suitable acrylate dispersion is Primal WDV 3317.

In addition, will the experiments without addition of an ammonium component (Examples 1) and with such an ammonium component (Examples 2, 3). Next mineral fillers, Auxiliaries and water can be aluminum hydroxide as another component z. B. be contained in the form of the hydrargillite, the strength of the material used positively influenced.

Parallel Also galvanized steel sheets were coated accordingly to the Bending behavior of the coated sheets to test.

special Influence on the insulation and strength properties has the glass fiber content of the vibration-damping Material. Experiments have shown that in an increase of Fiber content up to about twice the declared value the insulation properties could still be improved.

Example 1:

Material Composition:

All information refers to% by weight, unless otherwise stated. Acrylate dispersion (binder) 13.00 [or silicone resin emulsion] silica flour 74,00 glass fiber 0.25 preservation 0.20 Coalescent 1.00 dispersants 0.25 thickener 0.20 foaming agents 0.10 foam stabilizer 0.10 water 10,90

The antivibration Material was used to embed speakers in the back of the Interior of a motor vehicle used.

For installation of speakers by means of the vibration damping material was no acrylate dispersion, but a silicone resin emulsion used. Therefore, increased the percentage by weight of the emulsion over the Acrylate dispersion and the proportion of quartz flour was reduced accordingly.

To the material was foamed and at room temperature on the for the installation of the speaker provided surfaces of the recess means a spatula applied in a layer thickness of about 3 mm, after the surfaces previously dust, grease and dry, and at room or ambient temperature let it dry.

The thus obtained vibration damping Material became as well once in a formulation with and without foaming agent and foam stabilizer applied. The results achieved differed insofar as the material in a foamy job much more economical In use, the consistency of the foam was at a Formulation with foaming agent and stabilizer improved.

Parallel galvanized steel sheets were coated to the bending behavior the coated sheets to test and gave up to the said Layer thickness an excellent bending strength.

Example 2:

Vibration-damping material with ammonium component:

Material Composition:

All information refers to% by weight, unless otherwise stated. Acrylate dispersion (binder) 13.00 [or silicone resin emulsion] silica flour 74,00 glass fiber 0.25 preservation 0.20 Coalescent 1.00 dispersants 0.25 thickener 0.20 foaming agents 0.10 foam stabilizer 0.10 water 9.99 ammonium sulfate 1.00

The thus produced vibration-damping Material is mixed with an amino alcohol such as AMP 90 (2-amino-2-methyl-1-propanol) adjusted to a pH of 9.5.

Example 3:

Material Composition:

All information refers to% by weight, unless otherwise stated. Acrylate dispersion (binder) 13.00 [or silicone resin emulsion] marble sand 77,00 glass fiber 0.25 preservation 0.20 Coalescent 1.00 dispersants 0.25 thickener 0.20 foaming agents 0.10 foam stabilizer 0.10 water 7.90

The vibration damping material thus prepared is adjusted to a pH of about 10 with concentrated NH ₄ OH. Before use, an aqueous solution of 1.0 wt .-% zinc ammonium acetate is stirred.

The antivibration Materials of Examples 2 and 3 were made according to the example 1 applied.

Parallel galvanized steel sheets were coated to the bending behavior the coated sheets to test and gave up to the said Layer thickness an excellent bending strength.

at All specified embodiments was a significant when using the respective vibration damping material Improved the volume of sound in the interior of the motor vehicle detected and in Example 1 a clear sound optimization of the speakers achieved by increasing the glass fiber content to one and a half times that specified in Example 1 Value again improved. The evaluation was done by subjective assessment with the assistance of three test persons. The improvement of the acoustics was compared to one of the test persons Installation of the mentioned devices, as usual in the art, as much better felt. The bending strength increases with layer thicknesses greater than 3 mm, but is still good.

By the use of a foaming agent could be an improved fine-pored Foam structure can be achieved, the application behavior is positive affected. Due to the foam form, a more economical application is possible of the vibration-damping material. The parallel use of a Foam stabilizer is not mandatory, but has cheap Influence on the foam consistency. We only use compressed air for foaming, is the use to recommend a foam stabilizer.

The Layer thickness of 3 mm for the examples of use given here became due to practical considerations chosen with regard to these examples, limited but the usable layer thickness when applying not upwards. Further coating experiments have shown that the vibration damping according to the invention Material easily applied up to a layer thickness of 2 cm can be, without herunterzurinnen.

Claims (8)

Use of a polymer or synthetic resin dispersion in the form of an aqueous silicone resin emulsion, the at least one mineral filler, water and additionally one Ammonium salt of a mono-, bi- or trivalent organic carboxylic acid with up to 12 carbon atoms or their mixed salts with polyvalent metal ions or an ammonium salt of a mono-, bi- or trivalent inorganic Contains acid, as a vibration-damping Material. Use according to claim 1, characterized that the Polymer ← or Synthetic resin dispersion in addition at least one foaming agent and / or a foam stabilizer contains. Use according to claim 1 or 2, characterized in that the mineral filler out is selected from calcium carbonate, silica, talc and mixtures thereof. Use according to one of Claims 1 to 3, characterized that this antivibration Material in addition Contains aids, the selected are from dispersing, thickening, film forming and preservatives and their combinations. Use according to one of Claims 1 to 4, characterized that the Mixed salts of carboxylic acid with polyvalent metal ions, those of zirconium, titanium, zinc and / or aluminum. Use according to one of claims 1 to 5, characterized that this antivibration Material for suppression vibrations generated by vibrations in the vehicle, railway and wagon, aircraft, ship, plant and equipment area. Use according to claim 6, characterized that this antivibration Material for suppression from background noises in radio, music system and / or loudspeaker installations in motor vehicles, Railways, ships or aircraft serves. Use according to claim 7, characterized that this antivibration Material for suppression from vibrations generated by vibrations in fan housings and Ventilation channels is used.