RU2507228C1 - Vibration-absorbing epoxide composition - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to the mechanical engineering industry, particularly to vibration-absorbing compositions. The composition contains the following, wt %: epoxy diane resin - 17.0-30.0; monoglycidyl ether of butyl cellosolve - 10.0-17.0; talc - 22.0-40.0; graphite - 2.0-6.0; ferrite strontium powder - 7.0-20.0; micro-mica - 5.0-12.0; engineering clay based on enriched bentonites and sepiolites - 2.5-9.5; aminophenol curing agent - 7.0-11.0.

EFFECT: invention increases the coefficient of mechanical loss, strength of the coating in a wide temperature range and corrosion resistance.

2 tbl, 7 ex

Description

The invention relates to vibration-absorbing compositions used to reduce vibration, increase wear resistance, resistance to aggressive and corrosive environments of machine parts and mechanisms used in transport and agricultural engineering.

State of the art

When the vehicle is moving, road surface irregularities in the form of vibration are transmitted to the body, which causes an increased noise level inside the passenger compartment, which negatively affects the driver and passengers. Effectively deal with this phenomenon using vibration-absorbing coatings. At the same time, an important characteristic of these coatings is the preservation of their performance properties in various climatic conditions and under the negative effects of the environment (high humidity, solutions of salts and acids).

Known vibration-absorbing mastics based on an aqueous dispersion of vinyl or polyvinyl acetate containing a plasticizer, flame retardant, filler (RF Patent No. 2035482, published 05/20/1995; No. 2044017, published September 20, 1995; No. 2181739, published April 27, 2002; No. 2186814, published on August 10, 1992 .2008; No. 2375398, published on December 10, 2009; No. 2405016, published on November 27, 2010).

Known vibration-absorbing mastics containing a polyvinyl acetate dispersion modified with a diane or aminophenol epoxy resin, containing a flame retardant, a filler, an alkylbenzylpyridinium chloride and a hardener (RF Patent No. 2039779, published on July 20, 1995, No. 2044018, published on September 20, 1991, 2015; .

However, these compositions do not have water resistance and do not protect against corrosion, and also have a short time during which their technological properties are preserved.

Known vibration-absorbing epoxy composition, which is closest to the invention (RF Patent No. 2258720, published 20.08.2005). It contains, wt.%: Epoxy Dianova resin (20.7-40.8), active diluent (5.8-10.2), amine hardener (7.2-11.1) and mineral filler (41.8 -62.4) - wollastonite with a needle fraction of at least 30% with a ratio of the length to thickness of the needle 5: 1 and the length of the needle not more than 63 microns. Either phenyl glycidyl ether or butyl glycidyl ether or cresyl glycidyl ether is used as an active diluent.

However, although the composition allows to obtain a coating with improved mechanical characteristics of strength, hardness, elasticity, high damping properties, but only with a layer thickness of the order of several tens of millimeters.

The use of such a coating in a vehicle significantly increases its weight, which entails increased fuel consumption and increased emissions of harmful substances into the atmosphere. Rational is a coating with a thickness not exceeding 2-3 mm. At these thicknesses, the known composition does not provide a sufficiently high coefficient of mechanical loss, coating strength over a wide temperature range (from positive to low negative), and sufficient corrosion resistance of coated surfaces.

SUMMARY OF THE INVENTION

The objective of the invention is to search for a vibration-absorbing epoxy composition based on epoxy dianovoy resin, including an active diluent, filler and aminophenol hardener, which would simultaneously increase the coefficient of mechanical loss, strength over a wide temperature range and corrosion resistance.

The problem is solved by a vibration-absorbing epoxy composition containing, wt.%:

Epoxy Dianova resin - 17-30%,

Butyl cellosolve monoglycidyl ether - 10-17%,

Talc - 22-40%,

Graphite - 2.0-6.0%,

Strontium ferrite powder - 7-20%,

Micromica 5-12%,

Engineering clay based on enriched bentonites and sepiolites - 2.5-9.5%,

Aminophenol hardener 7.0-11.0.

The invention can significantly increase the coefficient of mechanical loss. This leads to a decrease in the noise level at the facility, which positively affects comfort and reduces the negative impact of vibration on the human body.

The invention also allows to increase the strength of the coating during operation of the device, not only at positive temperatures, but also, which is extremely important, at negative and low negative temperatures.

The invention also allows to increase the corrosion resistance of the surface on which the claimed composition is applied. In addition, the resulting coating has high water resistance, low density, resistance to aggressive environments. The preparation of the epoxy composition takes little time, it is convenient to apply the mastic on complex surfaces, curing under normal conditions occurs within 2 hours.

Information confirming the ability to reproduce the invention.

The invention is implemented using the following substances:

- epoxy resin dianovy GOST 10587-84;

- butyl cellosolve monoglycidyl ether - TU 2226-337-10488057-97, acting as an active diluent;

- Talc TU 5727-007-13413086-2008;

- Graphite GOST 17022-81;

- Powder ferrite strontium TU 2663-003-00186743-97;

- Micromica TU 5725-005-40705684-2001;

- engineering clay based on enriched bentonites and sepiolites TU 2164-019-40705684-2007;

- aminophenol hardener, for example AF-2 TU 2494-640-11131395-2007.

The composition is prepared as follows.

The paddle mixer with a volume of 100 l is heated up to 60 ° C for easier combination of the components, the epoxy diane resin, butyl cellosolve monoglycidyl ether, micromica and talc are loaded, mixed for 15 minutes. Then load engineering clay, graphite and strontium ferrite powder. Stirred for 15 minutes.

The second component in the form of a hardener is introduced before applying the composition to the treated surface. Moreover, within 50-60 minutes, the composition does not lose its operational ability, i.e. suitable for application.

Mastic on damped surfaces is applied with a spatula, or brush, and spraying. After applying the composition, the product can be operated after 2 hours, and the complete drying of the coating occurs in 24-48 hours.

Tests of the composition of the prototype and the invention were carried out identically with a coating thickness of 2 mm in accordance with the following methods:

1. Determination of the coefficient of mechanical losses (CMP) in accordance with DIN EN ISO 6721-3 (method A);

2. Strength at positive temperatures is determined according to GOST 4648-71

3. Impact resistance at negative temperatures was determined as follows: the coated plates were placed in a climate chamber with a temperature of minus (30 ± 2) ° С and held for (24 ± 2) hours. Then the plate with the sample is removed from the climate chamber and quickly installed on a metal stand with the coating facing up. A metal ball is thrown onto the sample from a height of (0.50 ± 0.05) m until cracks and delamination appear, and if not, they are tested until the temperature of the plate changes.

4. Corrosion resistance. The tests are carried out as follows: the coated plates are immersed at 2/3 of the height in a glass with a saturated solution of sodium chloride (350 g per 1 liter of water), into which hydrogen peroxide is introduced to a mass fraction of 1%. The glass is placed in a thermostat, where it is kept at a temperature of (30 ± 2) ° C for 3 hours. Then the plates are removed and dried for 30 minutes at room temperature.

Distilled water is poured into the desiccator, to which hydrogen peroxide is added to a mass fraction of 1%. At the same time, 4.8 ml of sodium thiosulfate solution with a mass fraction of 19% and 3.6 ml of sulfuric acid solution with a mass fraction of 10% are poured simultaneously. Dried plates and a cup with solutions are placed in a desiccator above a water mirror, closed with a lid, placed in a thermostat with a temperature of (50 ± 2) ° С, where they are kept for 4 hours. After that, the thermostat heating is turned off and the plates in the desiccator are allowed to cool for 16 hours to room temperature. The plates are removed from the desiccator, washed with water, the coating is completely removed and the state of the substrate is examined. There should be no signs of corrosion on the substrate.

The compositions of the composition at different quantitative contents of the components are shown in table 1.

Qualitative indicators of the prototype and the claimed composition of the compositions listed in table 1 are shown in table 2.

The data of tables 1 and 2 clearly prove the obvious advantages of the invention: the coefficient of mechanical losses increased 3 times at positive temperatures and 4 times at negative; strength at positive temperatures increased by 20%, and impact resistance at negative temperatures increased at least 5 times. No evidence of corrosion at all.

table 2 Indicators of acoustic and mechanical characteristics of samples from a vibration-absorbing epoxy composition Composition number ILC Strength at positive temperatures, N Shock resistance at low temperatures, the number of strokes Corrosion resistance, area,% Positive temperatures Negative temperatures one 0.35 0.22 71 Not less than 10 0 2 0.37 0.22 66 Not less than 10 0 3 0.37 0.24 69 Not less than 10 0 four 0.36 0.23 69 Not less than 10 0 5 0.39 0.25 70 Not less than 10 0 6 0.35 0.23 66 Not less than 10 0 7 0.36 0.25 69 Not less than 10 0 Prototype* 0.11 0.06 57 2 fifteen The composition of the prototype composition: ED-20 - 33.4 wt.%; wollastonite calcined at 300 ° C for 3 hours, sizing with Y-aminopropyltriethoxysilane - 51.0 wt.%; hardener DETA - 7.2 wt.%; butyl glycidyl ether - 8.4 wt.%.

Claims (1)

Vibration-absorbing epoxy composition containing, wt.%: Epoxy diane resin - 17.0-30.0, butyl cellosolve monoglycidyl ether - 10.0-17.0, talc - 22.0-40.0, graphite - 2.0- 6.0, strontium ferrite powder - 7.0-20.0, micromica 5.0-12.0, engineering clay based on enriched bentonites and sepiolites - 2.5-9.5, aminophenol hardener - 7.0-11 , 0.