DE4419886A1 - Sound-proof coating - Google Patents

Abstract

A new soundproof plastic coating can distort elastically, and is typically a polymer dispersion such as Basonate PA440. An additional portion can contain air pores, some of which at least are open. Cement can be included in the mixt., to reduce fire risk, also other ingredients to prevent plant growth. Application can be at high pressure and speed, to form a large proportion with open air pores.

Description

The invention relates to a soundproofing coating with a plastic rubber Granules.

The plastic-rubber-granulate coating is intended to dampen sound waves are used, especially in the railway superstructure to reduce Sound immissions due to partial stratification of the rail and sound immissions by coating closed areas such. B. tunnel walls, sound bulkheads, constructions of the ballastless superstructure.

There are numerous systems for reducing sound waves (noise). The well-known Systems are basically based on mass systems, multi-layer construction with or without surface structuring.

Critical about all systems is that they are voluminous and bulky are, therefore, often removed from the "source" and therefore complex and expensive become.

The invention has for its object a simple, practical and inexpensive system with high efficiency for damping sound waves ren.

The system is said to have a low construction height and complex shapes as well as existing constructions effectively afterwards can layer.  

The object is achieved in that with a kunststoffge bound rubber granules (especially from old tires) the emitting or re reflecting surface is coated.

A permanently elastic polyurethane (polymer dispersion) lends itself as plastic, that the adhesion to the surface and the elastic rubber granules other permanently guaranteed. All previous attempts and experiences have been with the binder Basonat PA 440, a product from BASF continuous

The plastic-rubber-granulate coating brings apart the bond to the Un just by the shape of the rubber granules from old tires (elongated, 5 to 8 mm long) creates a continuous porous structure.

Within this coating, the sound is broken, the sound energy in Heat converted or only a reduced proportion radiated or reflected.

The tests carried out have shown the following relationships:

• 1. The coarser the granulate, the better
• 2. Optimizing the thickness of the coating:
• - too thin: only sprinkled in; bad results
• - too thick: greater than 2 cm, negative reflection
• - Previous optimum: 0.5 to 1.5 cm.

To reduce the risk of fire, it is advantageous to cement the binder enrich (1/4 to 1/2 volume portions).

Another advantageous embodiment of the binder is that z. B. on free valences of the polymer dispersion agents against plant growth be involved. This is intended to counteract "mossing".  

A technically advantageous embodiment is that the plastic Rubber-granulate mixture is sprayed on / gate-locked. With this technique one particularly porous, sound absorbing coating achieved.

The advantages of the plastic-rubber-granulate coating are that:

• 1. the degree of absorption is very high and
• 2. the construction height is very low;
• 3. the costs are very cheap;
• 4. the soundproofing can be applied subsequently;
• 5. complicated cross sections can also be treated;
• 6. a preservation of the surface is associated with it;
• 7. Surface damage (cracks, bumps) were covered and
• 8. the coating thus also represents a protective layer;
• 9. the coating is mechanically resilient, d. H. especially passable remains (rescue vehicles).

Description of the system using the following schematic sketches:

Fig. 1 shows emitted and reflected sound waves in cross section at a game in the track with the plastic-rubber-granulate coating.

Fig. 2 shows a greatly enlarged cross section through the plastic rubber granule coating.

Fig. 1 shows an example from the railway construction. A half rail profile 1 is shown with an overlying part of a wheel 2 . Horizontal 3 , vertical 4 and curved 5 sound-reflecting surfaces are also shown.

The rail 1 is coated on the rail foot, on the rail web and on the underside of the rail head with a sound-absorbing plastic-rubber-granulate covering 6 . In addition, the boundary surfaces 3 , 4 , 5 are provided with a sound-damping coating 7 .

The wheel-rail contact is assumed as the sound source, which the sound (A) proceed directly or via already damped sound waves (B) from the rail web leaves. The sound waves are those from the plastic-rubber-granulate coating damped sound waves.

Fig. 2 shows a greatly enlarged section through the plastic rubber granule coating 6 , 7th

The elongated rubber granules 8 obtained from old tires are surrounded by plastic 9 . The plastic converges at the contact points and forms a permanently elastic connection between the granules. Cavities 10 arise in the coating.

Outgoing, emitted sound waves are lowered by the elastic framework puts; incoming sound waves are broken through the cavities.

Claims (10)

1. Sound insulation coating of sound-emitting and / or sound reflecting surfaces with a plastic-reinforced rubber granulate. 2. Soundproofing coating according to claim 1, wherein the plastic is elastic is deformable. 3. Soundproofing coating according to claim 2, wherein the plastic Is polymer dispersion. 4. Soundproofing coating according to claim 3, wherein the polymer dispersion Basonat PA 440 is. 5. Soundproofing coating according to one of the preceding claims, with an additional proportion of air pores. 6. Soundproofing coating according to claim 5, wherein the air void fraction is at least partially porous. 7. Soundproofing coating according to one of the preceding claims, each but with a cement admixture to reduce the risk of fire. 8. Soundproofing coating according to one of the preceding claims, each but with an additional involvement of plant growth handicaps Fabrics. 9. Soundproofing coating according to one of the preceding claims for the railway superstructure.   10. Apply the soundproofing coating according to one of the preceding Claims through high pressure / speed to a high one in particular to generate open-pore air pores.