Vibration-absorbing material

 

The invention relates to the production of materials designed to absorb vibration vehicles. The essence of the invention is a vibration-absorbing material consisting of rubber, bitumen, plasticizer, lubricant and filler, characterized in that as it contains rubber butyl rubber BK-1675N 10-20, as bitumen - bitumen road bn 90/130 - 60-70, as plasticizer - industrial oil I-20A - 10-20, as the lubricant is stearic acid technical stearin 2-3, as filler - carbon technical P - 34-44 and aluminosilicate microspheres ASM-500 - 17-22. The number of components is given in wt. including the Invention can significantly improve the heat resistance, specific vibraphone and economy of material. table 2., 1 Il.

The invention relates to machine building, in particular the automotive, industry and serves for producing heat resistant, self-adhesive, sealant materials to absorb vibration and struggle with structural noise.

The level of technology

To absorb vibration vehicles are widely used materials, which is a polymeric composition, of the tion, including rubber, bitumen, a plasticizer, a lubricant and a filler.

Known vibration-absorbing material comprising latex, bitumen and filler asbestos flour and barite concentrate /A. C. the USSR under the application №3235668/29-33, 1982.09.23, BI NO. 35, 32 IN 11/00, 04 43/00. Saratov Polytechnic Institute; Bulls C. A., Samsonov, A. C., Gorelov C. A., Aksenov N.And., Muraskin R. F., Fedorova HP/ Material characterized by good heat resistance, but little specific pneumatic.

Known vibration-absorbing pad containing synthetic rubber, bitumen, inden-coumarone resin, plasticizer and mineral fillers /A. C. the USSR under the application №2129611/28, 1976.07.30, BI NO. 28, 32 IN 7/02, 32 IN 11/00, research Institute of automotive materials, Shulyak A. D., Bull C. A., Aleshin B. C., Sudarikova R. W. and Gusev, C. J./. The material is also characterized by good heat resistance, but little specific pneumatic.

Also known vibration sound absorbing resin, comprising bitumen, asbestos, transformer oil and waste camphor /RF patent for application No. 93016107/05, 1995.02.09, BI # 4, 09 D 195/00, Rental enterprise Yaroslavl NII Spectrum LK", JSC Nizhny Novgorod org. synthesis "Orgsintez", Zlobin O. C., C. Pashin, A., Smirnova, L. I., Gorunova mechanical losses.

The closest technical solution is a vibration damping material for interior decoration hire /Application Japan, No. 2-205539, 1992.03.24, 08 L 21/00, F 16 F 15/02, Nippon gosei Gomu K. K., Mori, Kiyoshi, Gogo, Hitoshi, Fu-roiti Minoru, Miyaji Takumi/. The material is a composition which contains (in weight.h): 100 rubber (isoprene or norbornene); 1-2000 petroleum bitumen, plasticizer (recycled lubricating oil, castor or linseed oil) and lubricants (paraffin, liquid paraffin, vaseline, Carnauba wax, lanolin); 1-2000 adhesion promoter (rosin or other resin with a softening temperature of >60C); inorganic filler.

A wide range of ratios of the components of the material allows for the variation of its composition to achieve high values or coefficient of mechanical losses, or heat, or efficiency. For example, the increase in the content of bitumen leads to cheaper material, increasing its coefficient of mechanical losses, but also to reduce the resistance and increase the rubber content increases the heat resistance, but also increases the cost of the material and reduces the rate of the mechanical losses. Increase stergarwelcome reduces specific vibraphone.

Thus, the material obtained from this composition has high levels of a specific vibroplasty, heat resistance and economy. The optimal balance of these properties is achieved for the material containing the following quantities of components (prototype), wt. including:

Isoprene rubber 10

Petroleum bitumen 40

Recycled lubricating oil 10

Rosin 2

Kaolin 40

The economic use of vibration damping materials at comparable cost conveniently evaluated using a specific vibroplasty, representing the ratio of the coefficient of mechanical losses of a material to its surface density. This indicator allows us to estimate the amount of material to achieve a given level of vibroplasty.

The invention

The objective of the invention is a search heat-resistant, vibration-absorbing material consisting of rubber, bitumen, plasticizer, lubricant and filler, which would have simultaneously increased heat resistance, specific pneumatic and efficiency.

The problem is solved vibration-absorbing material consisting of rubber, bitumen, plasticizer, lubricants and fillers, as is tificate industry oil I-20A, as the lubricant is stearic acid technical stearin, as filler - carbon technical P and aluminosilicate microspheres ASM-500 with the following content, wt. including:

Butyl rubber BK-1675N 10-20

The bitumen road bn 90/130 60-70

Industry oil I-20A 10-20

Stearic acid technical stearin 2-3

Carbon technical P 34-44

The aluminosilicate microspheres ASM-500 17-22

Distinctive features of the invention are:

the use of butyl rubber BK-1675N, bitumen road bn 90/130, industrial oil I-20A, stearic acid technical - stearin and as filler - carbon technical P and aluminosilicate microspheres ASM-500.

These features in combination is not known to achieve higher values of resistance, specific vibroplasty and effectiveness of vibration damping materials.

The invention allows to significantly improve the heat resistance and specific vibraphone material. This is reflected in increased heat resistance and specific vibroplasty at 200 Hz is more than 3 times. When this material is inexpensive.

Moreover, the material has good strength tie is surrounding the possibility of carrying out the invention

For carrying out the invention use the following materials:

the bitumen road bn 90/130 GOST 22245-90

butyl rubber BK-1675N THE 2294-034-05766801-95

industry oil I-20A GOST 20799-88

stearic acid technical stearin GOST 6484-96

carbon technical P GOST 7885-86

the aluminosilicate microspheres ASM-500 TU 57173700284351-2002

To obtain the material in a heated working mixer sequentially loaded in required quantities butyl rubber BK-1675N, petroleum bitumen road bn 90/130, industrial oil I-20A, stearic acid technical stearin, carbon technical P and aluminosilicate microspheres ASM-500 and mix to fully combine the ingredients. Then, if necessary, the material is formed into, for example, are calibrated on the calender, and cool.

Properties obtained according to the invention the material in comparison with those of the prototype was equally determined as follows.

Specific vibraphone at 200 Hz represents the value of the coefficient of mechanical losses at 200 Hz, is related to the surface density of the material, and is calculated by the formula

where K - the coefficient of mechanical losses at 200 Hz

To measure the used rack of Brule-Kiera. In the studied material was chosen uniform thickness plot without damage, from which cut the sample size 26520 mm, the Sample was glued on an aluminum plate of the same size, pressing firmly, preventing deformation of the material, and cut off the exposed edge of the material and received a composite sample. The prepared sample was kept under normal conditions for two hours, and then fixed on the test stand vertically. Using the adjustment screw has established the minimum possible gap between the sensor and the plate. The gap between the exciter and the plate 10 mm

Put the generator frequency is 60 Hz, and the output voltage of amplifier 10 C. By changing the frequency and the control amplitude with an oscilloscope to find the resonant frequency. Then reduce the frequency so that the amplitude of umenshenia for several lengths of the composite sample.

Cleaned plate was determined resonant frequency of the plate without material for the same lengths that have been set for the composite sample. The obtained values were used to calculate the modulus of elasticity E1E2and the internal loss factor of the material2by the following formulas.

The modulus of elasticity of a metal rod, PA:

E1=48(I2fn/hk2n)2,

whereis the material density, kg/m3;

l, h is the length and thickness of the rod, m;

fnresonance frequency of the nth fashion, Hz;

kn- coefficient depending on the number of fashion and conditions of the fastening rod: k1=l,875, k2=4,694, k3=7,855, kn=(n-l/2)when n>3.

where L=4+6x+4x2-B12/B1;

x=h2/h1- the ratio of thicknesses of material and a metal rod;

C=1-b12/In1,

where B12and B1- Flexural rigidity per unit area (Nn12and fn1, (Hz), using the expression:

In=42l4f2nimi/k4n

where m12=1h1+2h2, m1=1h1weight of the composite sample and a metal rod per unit area (kg/m2);

l is the length of the rod (m).

The total loss factor of the composite sample:

wherefn- the width of the resonance curve measured at an arbitrary level An;

Andnthe amplitude of the n-th cycle, mm;

N=Amax/Andnwhere amaxthe amplitude of the oscillations at the resonant frequency, mm;

a=20lgn.

The coefficient of mechanical losses of material:

where

The surface density of the material was determined by weighing the sample material is known exactly square, and was calculated by the formula:

where M is the mass of sample mother of the rum (100100)2 mm as the substrate used metal plate 150150 mm of steel with a thickness of 0.80.02 mm according to GOST 16523.

The sample was applied on a metal substrate so that the distance from the bottom plate to the lower edge of the sample was not less than 30 mm and was tenfold primitively roller weighing 20,1 kg Control feature across the entire width of the plate was noted the position of the lower border of the sample.

The plate with the sample was mounted in a heat chamber vertically and kept at a temperature of 100C for 30 minutes and Then the sample was removed from the heating Cabinet, cooled to a temperature of 22C. the Resistance was characterized by the amount of displacement of the sample below the control line.

The strength of bonding with the metal was determined by the method of peeling at an angle of 90.

Before testing the specimens were kondicionirovanie according to GOST 12423-66. In the longitudinal direction on the section of adhesive material without defects cut out three sample length 1250.5 mm, a width of 250.5 mm On the sample side of the adhesive layer GCP alcohol and kept at room temperature for 10 minutes Next, the sample was glued to the plate, as indicated in the drawing by tenfold rolled with a roller weighing 20.1 kg without additional vertically applied loads. Test samples were assayed in 2 hours after gluing.

The free end of the sample mounted in the moveable jaw breaking machine and produced peeling until complete separation of the material from the plate at a speed of rolling clamp 10010 mm/min On a scale siloizmeritelya noted the maximum load in the zone of exfoliation.

The bond strength of the material plate (), N/cm, was calculated by the formula:

where P is the maximum force of delamination, N.;

in - the width of the sample, see

For the final result took an average of three indicators. A valid discrepancy between the results did not exceed 10%.

The compositions of the materials are shown in table 1. Qualitative indicators prototype and declared material at various quantitative content of the components shown in table 2.

Claims

Vibrato as it contains rubber butyl rubber BK-1675N as bitumen - bitumen road bn 90/130, as plasticizer - industry oil-20A, as the lubricant is stearic acid technical stearin, as filler - carbon technical P and aluminosilicate microspheres ASM-500 with the following content, wt.h.:

Butyl rubber BK-1675N 10-20

The bitumen road bn 90/130 60-70

Industry oil I-20A 10-20

Stearic acid technical stearin 2-3

Carbon technical P 34-44

The aluminosilicate microspheres ASM 17-22

 

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