RU208637U1 - vibration damping material - Google Patents

Abstract

The utility model relates to the automotive industry, namely to a vibration damping material designed to reduce vibration of the body of a light vehicle and a truck. Vibration damping material is used to reduce vibration in the temperature range from -45 to +80°C, determined by the design and technological features of the car. The vibration damping material is made in the construction with aluminum foil and includes a polymer layer based on butyl rubber, plasticizers and fillers. In this case, a mixture of low molecular weight polyisobutylene with a molecular weight from 900 to 2300 g/mol and industrial oil with a kinematic viscosity at +40°C from 6 to 110 mm2/s is used as plasticizers. The technical result is an increase in the coefficient of mechanical losses at temperatures from -20 to +10°C. 1 w.p. f-ly, 1 ill.

Description

This utility model relates to the automotive industry, namely to a vibration damping material designed to reduce vibration of the body of a light vehicle and a truck. Vibration damping material is used to reduce vibration in the temperature range from -45 to +80°C, determined by the design and technological features of the car.

Known vibration damping material (patent for invention No. 2542291, 2015), made in the design with aluminum foil and including a polymer layer based on butyl rubber and the following components: PN-6Sh oil as a plasticizer, chalk, talc, high-pressure polyethylene, fibrous waste cotton plants, ester of glycerol tall oil rosin and aluminosilicate microspheres. The claimed technical result is to increase the coefficient of mechanical losses, adhesive properties and frost resistance.

The disadvantage of this analogue is the low coefficient of mechanical losses at temperatures below +20°C and the use of oil PN-6Sh containing polycyclic aromatic hydrocarbons, which are carcinogens.

Known vibration damping material (patent for invention No. 2705961, 2019), made in the design with aluminum foil and including a polymer layer based on butyl rubber and the following components: bitumen brand BN 90/10, industrial oil brand I-20A, ethylene vinyl acetate, chalk and technical carbon. The claimed technical result is the expansion of the operating temperature of the vibration damping material in the range from -40°C to +80°C.

The disadvantage of this analogue is the high level of odor due to the use of bitumen in the vibration damping material, which limits the possibility of its use.

The closest analogue of the claimed utility model is a vibration-damping material (US patent No. 2004033354, 2004), made in the 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 weight polyisobutylene as a plasticizer, and also fillers of inorganic and organic nature. The claimed technical result is to increase the coefficient of mechanical losses and adhesive properties.

The disadvantage of this analogue is that the vibration damping material, in which the polymer layer is made on the basis of butyl rubber and contains low molecular weight polyisobutylene as a plasticizer, has a peak in the mechanical loss coefficient at temperatures above +10°C, while at lower temperatures the material efficiency is significantly reduced.

The objective of the claimed utility model is to create a vibration damping material for climatic zones with an average annual temperature of -20 to +10°C.

The technical result of the claimed utility model is an increase in the coefficient of mechanical losses at temperatures from -20 to +10°C.

The claimed technical result is achieved through the use of a vibration damping material made in the design with aluminum foil and including a polymer layer based on butyl rubber, a mixture of plasticizers consisting of low molecular weight polyisobutylene with a molecular weight of 900 to 2300 g/mol and industrial oil with a kinematic viscosity at +40°C from 6 to 110 mm ² /s. The specified vibration damping material, to give it the necessary physical, mechanical and technological properties, contains a filler in the composition of the polymer layer.

The main factor determining the achievement of the technical result is the use of a mixture of plasticizers consisting of low molecular weight polyisobutylene with a molecular weight of 900 to 2300 g/mol and industrial oil with a kinematic viscosity at +40°C of 6 to 110 mm ² /s. The shift of the mechanical loss coefficient peak in the temperature range from -20 to +10°C is controlled by changing the total content of the mixture of plasticizers in the polymer layer of the vibration damping material, by changing the content of industrial oil relative to low molecular weight polyisobutylene, and by changing the molecular weight of low molecular weight polyisobutylene. To shift the peak of the mechanical loss coefficient to the negative region, namely, to the temperature range from -20 to +10°C, the content of industrial oil increases and the content of low molecular weight polyisobutylene decreases, or the total content of the mixture of plasticizers increases and, accordingly, the content of butyl rubber or filler decreases, or decreases molecular weight of polyisobutylene. The peak intensity of the mechanical loss coefficient of the vibration damping material can be controlled by changing the thickness of the polymer layer and changing the thickness of the aluminum foil. Accordingly, regardless of the nature of the filler used, the use of the specified mixture of plasticizers in the polymer layer based on butyl rubber will increase the mechanical loss coefficient of the vibration damping material at temperatures from -20 to +10°C.

The vibration damping material is made in the design with aluminum foil 40-300 microns thick and has the following composition of the polymer layer:

1) Butyl rubber - 6-15 wt.%;

2) Polyisobutylene - 4-24 wt. %;

3) Industrial oil - 4-24 wt. %;

4) Fillers - 50-80 wt. %.

The vibration-damping material, according to the present utility model, contains a filler in the composition of the polymer layer, which can be of inorganic and organic nature. As a filler of inorganic nature, it is recommended to use chalk, talc, kaolin, barite and other large-tonnage fillers. As an organic filler - cellulose-containing fillers with a cellulose content of at least 50%.

The vibration-damping material, according to the present utility model, is self-adhesive, while the polymer layer is protected by an anti-adhesive material, which can be anti-adhesive paper or film. Anti-adhesive material for vibration damping material is selected in accordance with the existing state of the art and does not affect the achievement of the technical result and serves only to protect the polymer layer from contamination and damage.

Vibration damping material is illustrated by the drawing. In FIG. 1 shows the design of a vibration damping material, consisting of aluminum foil, a polymer layer and an anti-adhesive material.

The main parameter of the vibration damping material is the coefficient of mechanical losses, determined according to GOST R 56803-2015 (ISO 6721-3:1994) “Plastics. Determination of mechanical properties under dynamic loading. Part 3. Vibrations of bending. Resonance Curve Method. The mechanical loss coefficient of the vibration-damping material is provided by the proposed composition. The performance characteristics of the vibration damping material, in particular, adhesion properties, cold flow and heat resistance, are controlled by the content of butyl rubber, the content of the mixture of plasticizers, the content and nature of fillers.

Embodiments of vibration damping material 2 mm thick in construction with aluminum foil 90 µm thick and including a polymer layer with different content of industrial oil with kinematic viscosity at +40°C from 61 to 75 mm ² /s with respect to polyisobutylene are shown in Table 1 .

Table 1

Component name The composition of the vibration damping material, wt. % one 2 3 Butyl rubber 10.8 10.8 10.8 Polyisobutylene with a molecular weight of 1500 g/mol 19.2 15.4 11.5 Industrial oil with a kinematic viscosity at + 40 ° C from 61 to 75 mm ² / s 0.0 3.8 7.7 chalk 70.0 70.0 70.0 Temperature, °C Mechanical loss coefficient, reduced to 200 Hz, c.u. -twenty 0.11 0.13 0.17 -10 0.15 0.22 0.32 0 0.27 0.32 0.34 +10 0.34 0.30 0.28 +20 0.31 0.21 0.17 +30 0.26 0.16 0.12 +40 0.18 0.14 0.10

Embodiments of a vibration-damping material 2 mm thick in a construction with aluminum foil 90 μm thick and including a polymer layer with different content of a mixture of plasticizers, consisting of low molecular weight polyisobutylene and industrial oil with a kinematic viscosity at +40°C from 61 to 75 mm ² /s , are shown in Table 2.

table 2

Component name The composition of the vibration damping material, wt. % one 2 3 Butyl rubber 14.4 12.6 10.8 Polyisobutylene with a molecular weight of 1500 g/mol 15.4 13.4 11.5 Industrial oil with a kinematic viscosity at + 40 ° C from 61 to 75 mm ² / s 10.2 9.0 7.7 chalk 60.0 65.0 70.0 Temperature, °C Mechanical loss coefficient, reduced to 200 Hz, c.u. -twenty 0.30 0.29 0.17 -10 0.41 0.36 0.32 0 0.32 0.33 0.34 +10 0.20 0.22 0.28 +20 0.12 0.15 0.17 +30 0.09 0.10 0.12 +40 0.07 0.08 0.10

Variants of the implementation of vibration damping material with a thickness of 2 mm in a design with aluminum foil with a thickness of 90 microns and including a polymer layer at different molecular weights of low molecular weight polyisobutylene are shown in Table 3.

Table 3

Component name The composition of the vibration damping material, wt. % one 2 3 Butyl rubber 10.8 10.8 10.8 Polyisobutylene with a molecular weight of 900 g/mol 11.5 Polyisobutylene with a molecular weight of 1500 g/mol 0.0 11.5 0.0 Polyisobutylene with a molecular weight of 2300 g/mol 0.0 0.0 11.5 Industrial oil with a kinematic viscosity at + 40 ° C from 61 to 75 mm ² / s 7.7 7.7 7.7 chalk 70.0 70.0 70.0 Temperature, °C Mechanical loss coefficient, reduced to 200 Hz, c.u. -twenty 0.25 0.17 0.16 -10 0.30 0.32 0.24 0 0.31 0.34 0.25 +10 0.23 0.28 0.28 +20 0.12 0.17 0.28 +30 0.10 0.12 0.15 +40 0.08 0.10 0.12

Variants of the implementation of vibration damping material 2 mm thick in a design with aluminum foil 90 μm thick and including a polymer layer at different kinematic viscosities of industrial oil are shown in Table 4.

Table 4

Component name The composition of the vibration damping material, wt. % one 2 3 Butyl rubber 10.8 10.8 10.8 Polyisobutylene with a molecular weight of 1500 g/mol 11.5 11.5 11.5 Industrial oil with a kinematic viscosity at + 40 ° C of 6 to 8 mm ² / s 7.7 0.0 0.0 Industrial oil with a kinematic viscosity at + 40 ° C from 61 to 75 mm ² / s 0.0 7.7 0.0 Industrial oil with a kinematic viscosity at +40 ° C of 90 to 110 mm ² / s 0.0 0.0 7.7 chalk 70.0 70.0 70.0 Temperature, °С Mechanical loss coefficient, reduced to 200 Hz, c.u. -twenty 0.28 0.17 0.16 -10 0.31 0.32 0.29 0 0.27 0.34 0.33 +10 0.21 0.28 0.30 +20 0.10 0.17 0.19 +30 0.09 0.12 0.14 +40 0.07 0.10 0.12

Claims (2)

1. Vibration damping material made in the design with aluminum foil and including a polymer layer based on butyl rubber, plasticizers and fillers, characterized in that it contains a mixture of low molecular weight polyisobutylene with a molecular weight of 900 to 2300 g/mol and industrial oil with kinematic viscosity at +40°С from 6 to 110 mm ² /s. 2. Vibration damping material according to claim 1, characterized in that it contains an inorganic filler or an organic filler with a cellulose content of at least 50%, or a mixture thereof, as fillers.

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