Vibration-damping laminated material with foam granules (embodiments)
A vibration-damping layered material with foamed granules addresses inadequate performance in existing materials by enhancing vibration damping and sound insulation, achieving reduced car body vibrations and noise through two self-adhesive polymer layers with specific densities and granule compositions.
Patent Information
- Authority / Receiving Office
- RU · RU
- Patent Type
- Patents
- Current Assignee / Owner
- OBSHCHESTVO S OGRANICHENNOJ OTVETABTVENNOSTJU AVTOPLASTIK
- Filing Date
- 2025-10-31
- Publication Date
- 2026-06-30
AI Technical Summary
Existing vibration-damping and sound-insulating materials for cars exhibit inadequate performance, necessitating additional sound insulation materials and failing to effectively reduce body vibrations and noise.
A vibration-damping layered material with foamed granules, comprising two self-adhesive polymer layers based on butyl rubber, one with a density of 1.6 to 2.4 g/cm³ and the other with foamed polypropylene or polystyrene granules of 0.7 to 1.3 g/cm³, enhances vibration damping and sound insulation.
The material significantly reduces car body vibrations and airborne noise, improving vibroacoustic comfort by increasing the mechanical loss coefficient and sound insulation properties.
Smart Images
Figure 00000001
Abstract
Description
[0001] This invention relates to the automotive industry, specifically to a vibration-damping material designed to reduce body vibration in cars and trucks. The vibration-damping material is used to reduce vibration in temperatures ranging from -45 to +80°C.
[0002] A vibration damping material is known (RU No. 2705961, March 13, 2019), made in a design with aluminum foil and including a polymer layer based on butyl rubber and the following components: bitumen grade BN 90 / 10, industrial oil grade I-20A, ethylene vinyl acetate, chalk and carbon black.
[0003] A vibration damping material is known (US No. 2004033354, 08 / 14 / 2004), made in a design with aluminum foil and including a polymer layer based on butyl rubber and the following components: a thermoplastic polymer based on ethylene, low-molecular polyisobutylene used as a plasticizer, as well as inorganic and organic fillers.
[0004] The disadvantages of the above-mentioned well-known vibration damping materials are low vibration damping and sound insulation properties, which leads to both an unsatisfactory reduction in the vibration of the car body elements and the need for additional use of sound insulation materials.
[0005] The objective of the present invention is to expand the arsenal of technical means, namely the creation of a vibration-damping layered material with foamed granules, which has high vibration-damping and sound-insulating properties and is designed to reduce the vibration of car body elements, as well as airborne and structural noise in the car interior.
[0006] The technical result of the claimed invention is to increase vibroacoustic comfort in the car interior by reducing the level of vibration of the car body elements, as well as airborne and structural noise in the car interior.
[0007] The claimed technical result is achieved by creating a vibration-damping layered material with foamed granules, made in a design with a limiting layer and including two self-adhesive polymer layers based on butyl rubber, wherein the first polymer layer, connected to the limiting layer, has a density of 1.6 to 2.4 g / cm3 , and the second polymer layer, connected to the first polymer layer, has a density of 0.7 to 1.3 g / cm 3 and contains foamed polypropylene or polystyrene granules.
[0008] The characteristic of the vibration damping properties of a vibration damping material is the mechanical loss coefficient, determined at 200 Hz according to GOST R 56803-2015 (ISO 6721-3:1994) “Plastics. Determination of mechanical properties under dynamic loading. Part 3. Bending vibrations. Resonance curve method.”
[0009] The first and second polymer layers of the vibration-damping laminated material with foam granules are non-curing and self-adhesive and have high adhesion to various surfaces such as metal, plastic, etc.
[0010] The first polymer layer has a density of 1.6 to 2.4 g / cm 3 and is connected to a limiting layer with a thickness of 40-300 µm.
[0011] The first polymer layer contains:
[0012] 1) butyl rubber;
[0013] 2) plasticizer;
[0014] 3) fillers.
[0015] The quantitative composition of the first polymer layer, as well as the choice of fillers and plasticizers, are not limited by the present invention, and are determined by the operating conditions, while the following must be ensured:
[0016] - density from 1.6 to 2.4 g / cm 3 ;
[0017] - high adhesion to the limiting layer and the second polymer layer.
[0018] The second polymer layer is connected to the first polymer layer and contains:
[0019] 1) butyl rubber;
[0020] 2) plasticizer;
[0021] 3) polypropylene or polystyrene foam granules;
[0022] 4) fillers.
[0023] The diameter of the expanded polystyrene or polypropylene granules is most preferably, but not limited to, selected within the range of 1 to 8 mm.
[0024] The quantitative composition of the second polymer layer, as well as the choice of fillers and plasticizers, are not limited by the present invention, and are determined by the operating conditions, while the following must be ensured:
[0025] - density from 0.7 to 1.3 g / cm 3 ;
[0026] - high adhesion to the first polymer layer and to the base (car body elements) on which the vibration-damping laminated material with foam granules will be installed.
[0027] The first and second polymer layers may additionally include auxiliary components such as, but not limited to: reinforcing fillers (polymer fiber), thermoplastics (polyethylene, polypropylene), antioxidants, highly active additives (carbon black, etc.), resins (petroleum polymer resins, rosin, etc.), plasticizers, fire retardants, etc.
[0028] The first and second polymer layers can be composed of either virgin butyl rubber or reclaimed butyl rubber, which is obtained by recycling waste rubber, particularly from car inner tubes, diaphragms for vulcanizers, and other butyl rubber-based rubber products. When using reclaimed butyl rubber, its butyl rubber content and the content of other components, such as carbon black, are considered, and the polymer layer composition is selected accordingly.
[0029] The following may be used as a plasticizer, but are not limited to: PN-6 oil, industrial oil, polyisobutylene or a mixture thereof.
[0030] The filler used in the polymer layer can be inorganic or organic. Chalk, talc, kaolin, barite, and other large-tonnage fillers are recommended as inorganic fillers. Cellulose-containing fillers with a cellulose content of at least 50% are recommended as organic fillers.
[0031] The plasticizer and filler and their content are selected, among other things, in accordance with the current level of technology.
[0032] The vibration-damping laminated material with foam granules is designed with a limiting layer. The limiting layer can be made of, but is not limited to, aluminum foil, non-woven fabric, polyethylene terephthalate, or polyethylene film. The limiting layer is selected based on the operating conditions of the vibration-damping laminated material with foam granules and affects the shift of the peak of the mechanical loss coefficient and its intensity.
[0033] In the automotive industry, it is most preferable to use aluminum foil with a thickness of 50-100 microns as a limiting layer.
[0034] The thickness of the first and second polymer layers can vary from 1 to 8 mm and depends on the requirements for the performance characteristics of the vibration-damping laminated material with foam granules and the area of its application.
[0035] It is most preferable that the thickness of the first polymer layer is 2 mm, and the thickness of the second polymer layer is 4 to 6 mm.
[0036] The second polymer layer of the vibration damping material is additionally protected by a release material, which can be anti-adhesive paper or film. The release material for the vibration damping material is selected in accordance with the current state of the art and does not affect the technical result. It serves only to protect the polymer layer from contamination and damage.
[0037] The vibration-damping laminated material with foamed granules is explained by the drawing. Fig. 1 shows the design of the vibration-damping laminated material with foamed granules, consisting of a limiting layer (1, Fig. 1), a first polymer layer (2, Fig. 1), a second polymer layer (3, Fig. 1) and an anti-adhesive material (4, Fig. 1).
[0038] Examples of the implementation of vibration-damping layered material with foamed granules are given in Table 1.
[0039] The compositions of the first and second polymer layers used for the experiment are shown in Table 2.
[0040] Table 1
[0041] Layer type Layer thickness, mm 1 sample 2 sample 3 sample 4 sample Aluminum foil 0,09 0,09 0,09 0,09 The first polymer layer has a density of 2.00±0.05 g / cm3 2 2 2 2 The second polymer layer with granules of foamed polypropylene, density 1.00±0.05 g / cm3 4 6 - - The second polymer layer with expanded polystyrene granules, density 1.00±0.05 g / cm3 - - 4 6 Name of the indicator Experimental results 1 sample 2 sample 3 sample 4 sample Airborne noise insulation index, Rw, dB (100-3150 Hz) 34 35 34 35 KMP (st. 0.8 mm, 200 Hz), c.u., at: -20°С -10°С 0°С +10°С + 20°С + 30°С + 40°С 0,40 0,49 0,55 0,58 0,61 0,60 0,52 0,46 0,53 0,61 0,63 0,65 0,64 0,56 0,30 0,36 0,41 0,52 0,56 0,57 0,52 0,32 0,40 0,48 0,56 0,59 0,63 0,57
[0042] Table 2
[0043] Component name Composition of the polymer layer, % First polymer layer Second polymer layer with polypropylene granules with polystyrene granules Butyl rubber 5,3 7,8 7,8 PN-6 oil 12,5 22,2 22,2 Chalk 82,2 66 66 Foamed polypropylene granules - 4 - Expanded polystyrene granules - - 4 Total 100 100 100
Claims
1. A vibration-damping laminated material with foamed granules, made in a design with a limiting layer and including two self-adhesive polymer layers based on butyl rubber, characterized in that the first polymer layer, connected to the limiting layer, has a density of 1.6 to 2.4 g / cm 3 , and the second polymer layer, connected to the first polymer layer, has a density of 0.7 to 1.3 g / cm 3 and contains foamed polypropylene granules.
2. A vibration-damping laminated material with foamed granules, made in a design with a limiting layer and including two self-adhesive polymer layers based on butyl rubber, characterized in that the first polymer layer, connected to the limiting layer, has a density of 1.6 to 2.4 g / cm 3 , and the second polymer layer, connected to the first polymer layer, has a density of 0.7 to 1.3 g / cm 3 and contains foamed polystyrene granules.