CS252526B1 - Material for the production of soundproof films - Google Patents

Abstract

The solution concerns a material for the production of soundproof foils. Foils made from it are characterized by very good shape memory and the ability to combine with interior or absorption layers. At the same time, they have a high degree of air impermeability in a wide temperature and frequency range and a product of the loss coefficient and the dynamic modulus of elasticity. The above effect is achieved by a mixture consisting of petroleum asphalt, butadiene-styrene thermoplastic copolymer and mineral, respectively. metal filler.

Description

I 252526

The invention relates to a mass for the production of non-sound films.

In order to attenuate the noise penetrating through the thin-walled structures (bodywork, air-handling equipment, thin-walled partition walls, etc.), non-sound materials, most often in the form of foils, are used in particular in the supersonic area of the constructions. The preference for the mepro-fabric materials produced in the form of foils is advantageous for series production, where they can be pre-prepared in a form suitable for assembly.

Such materials, in addition to requiring a high degree of airtightness in the desired temperature and frequency range, must also meet the requirements of the form memory (for insulating the molded parts), having the ability to easily connect with absorbent or interior layers (car mats and the like). .) and have a high internal attenuation. The material's material properties are most objectively characterized by the product of the loss factor of the dynamic modulus of elasticity. All these features must be fulfilled, assuming low production costs and, at the same time, minimizing claims for inorganic products.

A disadvantage of many previously known solutions is that they use proven carcinogenic elements (mapr, asbestos). Another disadvantage is the use of materials that solve these requirements at the cost of greatly costly raw materials.

These drawbacks are eliminated by the production of non-sound film according to the invention, which consists of a compound composition of 17-33% by weight of petroleum asphalt, preferably 23%, preferably from 3% to 7% by weight of linear butadiene styrene block copolymer, preferably 4% and 60%. 80% by weight of mineral liquid, such as shale, limestone, barite, chalk, bentonite, spheroid, and the like a powdered metal such as iron, lead, aluminum or bronze powder, preferably a mixture of two or more of these, preferably 73%,

The main advantage of the non-sound film composition according to the present invention is that the films produced therefrom achieve a higher degree of airborne sound insulation in comparison to the frequency and thermal range, while at the same time achieving a sufficient large loss-making effect. the dynamic and modulus of elasticity and the possibility of thermal forming. A further advantage of the composition for the production of non-sound foils according to the invention is the wide-ranging modification of its composition in order to obtain suitable utility and constructional properties of the final product transfer.

The damping film made of the material of the invention may be associated with any suitable type of interior or absorption layer (carpet, foam, etc.), but may also be made separately.

In a particular embodiment, the needle is composed of 23 wt% petroleum bitumen from a petroleum distillate with a penetration of 150-320 1/10 mm at 25 ° C, 4 wt%. of a thermoplastic linear butadiene-styrene block copolymer having a molecular weight of 70,000-120,000 g / mole of 73% by weight of a slate / limestone blend as a filler in a ratio of 1: 4 to 1: 3 of a particle size of 0-0.63 mm, with 95 pairs. it must pass through a sieve with a mesh width of 0.2m.

In another particular embodiment, the mass is composed of 34% by weight petroleum bitumen from petroleum distillation with 150-320 1/10 mm at 25 ° C, 6% by weight. a thermoplastic linear-butadiene-styrene block copolymer having a molecular weight of 70,000-120,000 g / mole of 60% by weight of slate spraying 0-0.63 mm, with 95% having to pass through a 0.2 mm mesh screen.

A specific example is 22.84 wt% petroleum bitumen from petroleum distillation; 4.06% by weight of thermoplastic rubber; 15% by weight of shale and 58.10% by weight of finely ground limestone. From this mass, folios are made on the upper side provided with a micro-foil foil and on the underside a self-adhesive layer and a paraffin paper.

Petroleum asphalt can be replaced by a mixture of asphalt with alkaline oil.

In Figure 1, a specific frequency dependence of the air sound insulation of the film produced according to the invention is shown in comparison with the prior art represented by the graph 2.

Both graphs represent the airborne soundproofness of the 3.2 mm rake applied to the 0.8 mm steel sheet.

The average degree of airborne sound insulation of the film of the present invention of the particular embodiment for the octane band of 125 to 2000 Hz is 35 dB, the coefficient of coefficient and the dynamic modulus of elasticity of the film is 55 MPa, the heat resistance of -30 to +80 ° C, short +100 QC.

In particular, it is possible to use the composition according to the invention for the production of films intended to increase the airborne sound insulation of thin-walled constructions such as car bodies, machine-tool covers, lightweight partitions in the building industry and the like.

Claims (1)

252526 SUBSTITUTE A composition for the manufacture of a non-sound film comprising a blend of 17 to 33% by weight petroleum asphalt from petroleum distillation with penetration of 150 to 320 1/10 mm at 25 ° C, 3 to 7% by weight. of a thermoplastic linear butadiene-styrene block copolymer; and 60- INVENTION 80% by weight of a mineral filler, such as slate, limestone, bait, chalk, bentonite, sludge, resp. a metalplate or powder such as iron, lead, aluminum, bronze powder or sawdust, optionally a mixture of two or more of these. 1 sheet of drawings