CS262079B1 - Formable sound-insulating material - Google Patents

Abstract

In the production of soundproofing materials formed by metal layers bonded with a suitable plastic, it is usually necessary to chemically or mechanically modify the metal surface to achieve higher layer adhesion. In order to achieve good adhesion of the moldable sound-proofing material, it is sufficient to degrease the metal sheets or to provide them with a primer. The mouldable soundproofing material consists of at least two metal layers and a softened polyvinyl chloride layer comprising 100 wt. parts of PVC, 10 to 60 wt. parts of plasticizer, 50 to 500 wt. parts of inorganic filler (e.g., micronized limestone, barium sulfate, fine metal particles) and up to 150 wt. parts of softened PVC waste, the layer being coated on both sides with a 2-ethylhexylacrylate-based permanent adhesive solution.

Description

The invention relates to a moldable soundproofing material.

For damping of high levels of vibrational and sound frequencies produced by noise generating units or machine units and for soundproofing of working spaces near and inside such sources are used eg damping insulating layers of bulky, mostly lightweight plastics glued unilaterally on walls or device covers, thermoplastic deposits on metal or wooden instrument housings, multi-layer laminates of metal sheets and textiles, and special soundproofing curtains. Sound insulating sheets produced by joining two layers of metal with suitable plastic have very good damping effects so that the whole has a high internal damping coefficient. Plastics used for this purpose include, for example, modified polyethylene and propylene, polyamide, acrylates, polyvinyl acetate and ethylene-vinyl acetate copolymer, optionally filled with various types of inorganic fillers. A layered material in which a layer of rubber compound is interposed between the steel plates also exhibits good sound insulation properties. The rubber composition contains 100 wt. d. Mixtures of butadiene-acrylonitrile copolymers (5 to 95 wt.%) and polyvinyl chloride or copolymers thereof, 15 to 50 wt. d. Coumarone resins, filler and plasticizer. There is a hot melt adhesive film (ethylene-vinyl acetate) on both sides of this rubber layer. The layers were combined in a press after heating to 120-200 ° C (Japanese Patent Application 59-073 945). The disadvantage of this material is the relatively high cost of the base polymer and the necessity of using higher temperatures in the production process in order to join the individual layers.

These disadvantages are overcome by the formable soundproofing material according to the invention.

This material consists of at least two layers of metal, optionally provided with a primer, and a layer of plasticized polyvinyl chloride, provided on both sides with a coating of a permanent adhesive solution based on 2-ethylhexyl acrylate. The polyvinyl chloride-based layer contains 100 wt. d. polyvinyl chloride, 10 to 60 wt. d plasticizers, such as dioctyl phthalate or dioctyl adipate, 50 to 500 wt. d. inorganic fillers, such as micronized limestone, barium sulfate, or fine metal particles, and up to 1150 wt. d. waste softened polyvinyl chloride.

The advantages of the mouldable soundproofing material according to the invention are that the plasticized polyvinyl chloride film sandwiched between the metal layers is relatively inexpensive with very good sound insulation, and the cost of the plasticized polyvinyl chloride waste decreases further; permanently adhesive 2-ethylhexyl acrylate adhesive enables continuous production of laminated materials at normal temperature; there is no mechanical and chemical treatment of metallic materials, which only need to be degreased and possibly primed. The sound-insulating material according to the invention is moldable according to the needs of further production while maintaining the sound-insulating properties and the cohesion of the individual layers.

The following examples serve to illustrate the invention in more detail, where the magnitude of the noise and vibration damping value is given in the values of the logarithmic decrement λ, which equalizes two adjacent amplitudes, damped oscillations (the value of λ is given in%). Example 1

Between two 1 mm thick steel sheets, a plasticized polyvinyl chloride film having a 2-ethylhexyl acrylate-based adhesive coating of 40 g dry matter / m ^{2 was} deposited on both sides.

Foil composition:

suspension polyvinyl chloride 60 wt. d.

plasticizer-dioctyl phthalate 25 wt. d.

micronized limestone 90 wt. d.

waste plasticized polyvinyl chloride 100 wt. d.

The laminated material exhibited the following logarithmic values of λ after compression at 23 ° C and 1.0 MPa:

A (25 ° C) = 50% λ (50 ° C - 35%)

Example 2

A plasticized polyvinyl chloride film having a 2-ethyl hexylacrylate-based adhesive coating on both sides was deposited between two steel sheets of 0.3 millimeter in an amount of 50 g dry matter / m ² .

Foil composition:

suspension polyvinyl chloride 60 wt. d.

plasticizer-dioctyl phthalate 25 wt. d.

micronized limestone 90 wt. d.

waste plasticized polyvinyl chloride 100 wt. d.

The laminate was prepared by continuous rolling at 23 ° C. The following logarithmic decrement values were measured:

A (25 ° C) = 80% A (45 ° C = 60%)

Example 3

A sheet of softened polyvinylchloride was placed between two 1 mm thick steel sheets, which had a 2-ethylhexyl acrylate-based adhesive coating on both sides of 60 g dry matter / m ² (Kontalep AGL).

In the same manner as in Example 3, a sample of the laminate was prepared. The following logarithmic decrement values λ were measured:

λ (23 ° C) λ = 55% ^(C 60 C) = 60%

Foil composition:

Example 5 suspension polyvinyl chloride plasticizer dioctyl phthalate barium sulfate waste softened PVC

100 wt. d.

wt. d.

250 wt. d. 150 wt. d.

A sample of the laminate was prepared by pressing at 23 ° C at 5 MPa for 5 s. The following logarithmic decrement λ values were measured:

Λ (25 C) = 70% λ (60 C) = 62%

Example 4

A plasticized polyvinyl chloride sheet having a 2-ethylhexyl acrylate-based adhesive coating of 60 g dry matter / m ² (Kontal p AGL) was placed between two steel sheets of 1 mm thickness. Foil composition:

suspension poles- vinylchlořtťl plasticizer- 100 ALIGN! wt. d. , dioctyl phthalate 45 wt. d. barium sulphate Fe sawdust, size 150 wt. d. particles 0.0046 mm waste softened 100 ALIGN! wt. d. polyvinyl chloride 150 wt. d.

A plasticized polyvinyl chloride film having a 2-ethylhexyl acrylate-based adhesive coating of 60 g dry matter / m ² (Kontalep AGL) was placed between two 1 mm thick steel sheets. Foil composition:

suspension poles- vinyl chloride plasticizer- 100 ALIGN! wt. d. -dioctyl phthalate Pb dust, size 40 wt. d. particles 0.05 mm waste softened 500 wt. d. polyvinyl chloride 150 wt. d.

In the same manner as in Example 3, a sample of the laminate was prepared. The values of logarithmic decrement λ are as follows:

λ (22 ° C) = 40%

(60 ° C) = 65%

The mouldable soundproofing material according to the invention can be used as building elements (doors, walls), structural elements (compressor housings, road machine cabs), electrical equipment (generators, refrigeration equipment), transport (passenger and freight wagons, railway wagons), or transport elements (vibrating troughs, piping systems).

Claims (1)

A mouldable sound-insulating material, characterized in that it consists of at least two layers of metal and a layer based on softened polyvinyl chloride containing 100 wt. d. polyvinyl chloride, 10 to 60 wt. d. plasticizers, such as dioctyl phthalate or dioctylaidipate, 50 to 500 wt. d. inorganic fillers such as micronized limestone, barium sulfate or fine metal particles and up to 150 wt. d. waste softened polyvinyl chloride, the layer being coated on both sides with a solution of a permanently adhesive adhesive based on 2-ethylhexyl acrylate.