CS277649B6 - Thermoplastic material for sound and vibration damping - Google Patents

Description

The invention relates to a thermoplastic noise and vibration damping material and laminated and layered products made therefrom which can be used in particular in the partition between the engine and the interior of a motor vehicle such as a passenger car, and generally in other locations of vehicles, trains, airplanes etc. , and in the walls, floors, ceilings and metal cladding of buildings, household equipment and industrial machinery, in the last two cases due to their vibration isolation ability.

It is known to produce a thermoplastic material comprising chloropolyethylene mixed with an oil which can be replaced by a plasticizer and fillers.

It is an object of the present invention to provide a thermoplastic material and laminated and layered products derived therefrom, suitable for the aforementioned applications, and in particular for the partition between the engine and the interior of the motor vehicle. This material must have excellent acoustic properties such as acoustic barrier and anti-vibration, good values known as fogging, which is the evaporation of volatile substances depositing on cold surfaces, especially glass surfaces such as vehicle interior windows, preventing their transparency, high flexibility, ability to easily connect to other components and walls of vehicle interior or compartments, · high stability and resistance to higher temperatures, optimal value of Young's modulus, ie elastic modulus under pressure and mechanical loss factor, known as delta tangent, which measures the ability of material to dissipate energy , good adhesion and aging resistance, easy lamination, manufacturing and handling capability and low cost manufacturing.

Researching the materials and products derived therefrom has found that the above objectives can be achieved by replacing the oil or plasticizer with an extender selected from one or more of the following: low volatility plasticizers, hydrocarbon oil, asphalt and / or other materials having the same function as an emollient if the overall compatibility between the extender and the chloropolyethylene is maintained. This tolerance is defined by the upper cooling temperature, which is measured according to ASTM T 611, method B. It must be less than 100 ° C, preferably less than 70 ° C.

SUMMARY OF THE INVENTION The present invention provides a thermoplastic noise and vibration dampening material comprising from about 0.6% to about 50% chloropolyethylene, from about 20% to about 95% filler, and from about 4% to about 60% extender selected from one or more low volatile plasticizers, hydrocarbon oils, asphalts; and / or other materials performing the same function, wherein the extender is selected to maintain compatibility with chloropolyethylene as defined by an upper cooling temperature of less than 100 ° C, preferably less than 70 ° C according to ASTM T-611 Method B, the material comprising further additives modifying the physical properties of the finished material or certain constituents in the desired direction, in particular the optimization of the value by misting, i.e. the evaporation of volatile substances, measured according to DIN 75201.

Another aspect of the invention is a thermoplastic material that is laminated alone or together with an absorbent material positioned in any position in one or more layers to form a laminated product which is then placed in place.

The material can be laminated separately and then shipped in this state to another factory where it is bonded to other absorbent materials such as porous felt, synthetic foam, wood, cork, etc. to obtain layered products which are then placed at the necessary locations .

The adjusting component must be selected appropriately for each particular case, but the upper cooling temperature must always be below 100 ° C.

Various test methods are used to measure the properties of the thermoplastic material.

This is, for example, fogging, which is the evaporation of volatile materials from the materials and their subsequent condensation on cold surfaces, especially on the glass and especially on the vehicle windows, in terms of the amount of volatile substances trapped on the surfaces, which must be as small as possible. Furthermore, the deposits of these volatile substances must have a low opacity so as not to impair visibility through the windshield of the vehicle in particular. This property is measured according to DIN 75201, although other measurement methods are also applicable.

The flexibility of the material is measured by static bending of the sample by its own weight, when the sample is placed on a table to partially overlap. It has been found experimentally that plates made of highly flexible material are better sound barriers than plates made of solid materials.

The low temperature behavior is characterized by the fragility of the materials tested. This is measured by dropping 500 g of a steel ball with a height of 30 cm and detecting whether a crack at the low test temperature is present.

Resistance and stability at high temperatures are measured by placing the material on an area tilted at 75 ° for 5 hours at 85 ° C by observing whether or not the material is flowing.

It has been observed that the products obtained according to the invention are not subject to any modification or modification.

The Young's modulus, i.e. the modulus of elasticity under pressure, is measured with a device called Metravib at a shift of ± 50 µm. The tangent delta (tg δ) characterizes the mechanical loss factor and expresses the dissipative properties of the material. It is measured in connection with the Young's module measurement. The lower the value of the modulus E ', that is the real part of the Young's modulus, the greater the elasticity of the material and the greater the value of tg δ, the more dissipative the material.

Thermoplastic materials 1 to 5 have been prepared, the material 1 corresponding to a typical known material and the materials 2 to according to the invention.

For these materials, the upper cooling temperature, fogging and brittleness were measured according to the above test methods.

The following table shows the composition of the materials from the various examples and the values of the above properties. In the table (1) Repex E 7 means (2) SMR-60 and (3) means DIDP (abbreviation for diisodecyl phthalate).

Table 1

Examples 12345

Quantity of components (parts by weight)

Aromatic oil (1) Semi-automatic oil (2) Plasticizer (3) 85Ό 850 425 425 425 425 850 Filler 4500 4000 4500 4500 4500. Chlorpolyethylene 225 200 225 225 200 Physical properties Upper cooling temperature (° C) 102 63 20 May 60 20 May Fogging inappropriately 96 97 87 Fragility (’C) -5 -25 -30 -30 With the materials of Examples 2 to 5a with sample already acquaintances on the market

based on asphalt and EPD polymer (abbreviated for ethylene propylene-diene monomers) sound insulation measurements were taken in the form of sound insulation value, expressed in decibels, at various sound frequencies. These measurements were performed in a box consisting of two small chambers with identical anechoic properties separated by a metal plate. An amplion was placed in one chamber and a microphone to measure the sound pressure in the other.

First, the sound pressure was measured with a 0.8 mm thick steel plate, then the chambers were separated by an assembled steel plate, an absorbent (19 mm thick porous felt) and a plate obtained according to the invention with a weight of 7 kg / m. The difference, expressed in decibels, is the measurement of sound insulation by an assembly made up of absorbent material and the sound to be tested.

insulating material. Table 2 Frequency Comparative Examples Hz sample 2 3 4 5 Value attenuation sound (decibels) 125 10 15 Dec 14 14 14 250 6 7 8 8 7 500 14 16 16 16 16 1000 16 19 Dec 19 Dec 19 Dec 18 2000 36 37 39 39 39 4000 37 43 41 42 40 8000 49 50 52 51 51 From this table you can derive, that value sound isolation

for the sample to be compared, it is lower than for the material of Examples 2 to 5.

/ / EN 277649 B6 4

The invention has been described above and has been particularly characterized by some preferred examples. However, the scope of the invention is given by all variants falling within the scope of the invention.

Claims (4)

Thermoplastic noise and vibration damping material, characterized in that it consists of 0.6 to 50% by weight of chloropolyethylene, 20 to 95% by weight of filler and 4 to 60% by weight of an extender selected from one or more low volatile plasticizers, hydrocarbon oils , asphalt and / or other materials having the same function, wherein the extender is selected to maintain compatibility with chloropolyethylene, defined by an upper cooling temperature of less than 100 ° C, preferably less than 70 ° C, the material further comprising other additives modifying the physical properties of the resulting material. 2. The thermoplastic material of claim 1 which is:. laminated alone or together with an absorbent material positioned in any position and / or in one or more layers to form a laminate. 3. A thermoplastic material according to claim 1 or 2, characterized in that after lamination, the sheaths are bonded to layers with other absorbent materials, such as porous felt, synthetic foams, wood, cork, etc., to meet specific requirements. 4. Thermoplastic material according to claim 1, 2 or 3, characterized in that the additives modifying the physical properties of the resulting material are curing, stabilizing, coloring, lubricating, flame retardant antioxidants and / or additives optimizing fogging values.