Vibration-absorbing resin

 

(57) Abstract:

The invention relates to the field of vibration damping compositions for coatings, in particular for in-situ coating of marine areas. Mastic contains, wt%: 39,4-56,0 aqueous polyvinyl acetate dispersions, plasticized with dibutyl phthalate or triacetate of glycerol; 11.8 to 19,0 nepheline flame retardant; 26,0-42,0 crystalline graphite. What's new is that the mastic to improve the stability further comprises, in wt.%: 2,2-8,0 chalk and 0.5-4.6 alkylbenzyldimethylammonium. table 2.

The invention relates to the field of production and application of vibration damping compositions for coatings, in particular for in-situ coating areas of the vessel.

Known vibration-absorbing resin, comprising, by weight. 42,6-51,6 plasticized polyvinyl acetate dispersion (PVAD), from 9.6 to 10.6 nepheline flame retardant (); 32,3-34,0 crystalline graphite (KG) and 6.5-12.8 chloroparaffin [1]

Floor it has a complex good operating characteristics: high vibro-acoustic performance, excellent adhesion, low inflammability. However, the stability of the main vibroacoustic properties in time he nedolgim currently norms average life of the vessel is 20-25 years).

The technical essence and the achieved effect is closest to the invention is a vibration-absorbing resin, comprising, by weight. 45,5-50,0 water PVAD; plasticized with dibutyl phthalate (DBP); 14,0-18,0 ON and 36,0-40,0 KG [2] Floor it has a complex of valuable operational characteristics: high, stable in time (for 3 year loss ratio decreased by not more than 8-12%) vibroacoustic characteristics, excellent adhesion, low inflammability. However, the stability of the most important technological properties of the mastic is not high enough. After 3-5 days from the date of manufacture mastic begins to noticeably lose their mobility, and after a month of storage the value of this indicator falls approximately three times. This is a very serious lack of technological material, negative consequences of which are:

the complexity of rubbing mastic from storage reservoirs (to avoid premature irreversible drying out mastic as any composition based on water PVAD, must be kept in a sealed container). Thick mastic literally have to pick out from cans and drums low operation beyond MGU from cans crumb's almost impossible (even after prolonged stirring and adding additional quantities of water) to turn into a smooth paste what is freshly made mastic. Hence the problem with mastic on temperame surface lumps substantially hinder spacelane and day exclude mechanized spraying, as they constantly clog the nozzle of the spray device;

vibroacoustic damping performance of the coatings of the famous mastic prototype stored for one month in the normal plant conditions, 25-30% lower than that of the coatings of the freshly prepared material.

Because engineering plants it is difficult to provide immediate full use fresh mastic, the task of improving the stability of its technological properties is one of the most important.

The aim of the invention is to increase the stability of the technological properties of the vibration-absorbing putty in time.

This objective is achieved in that the vibration-absorbing resin, comprising water plasticized polyvinyl acetate dispersion, nepheline flame retardant and crystalline graphite, additionally contains chalk and alkylbenzyldimethylammonium (ABP) in the following ratio, wt.

Water PVAD, plasti-
CHCH Cl-where n is 2-5.

To obtain the claimed mastics are usually used industrial brand coarse PVAD, for example DF/5 (contains 48-52 wt. the dry residue, 10 wt. DBPS), DF/7 (dry residue 48-53 wt. DBP 15 wt.), DF/VM (dry residue 55 wt. DBP 15 wt.), D50 (dry residue 50-51 wt.), D (dry residue 60 wt.), D (dry residue 40 wt.), produced in accordance with GOST 18992-80 and KG foundry, in accordance with GOST 5279-74, in accordance with THE 6-08-340-76, ABP in accordance with THE 6-01-1026-75.

P R I m e R 1. Vibration-absorbing resin was prepared by sequentially adding at room temperature and continuous stirring (50 rpm) to 37,2 g PVAD brand D50 4.9 g DBP, and 11.8 g, 42 MHC, 3,1 chalk and 1 g ABP. Filler was introduced in small portions to avoid clumping. After obtaining a homogeneous mass mastic divided into two roughly equal to the mass of the part. One is placed in a plastic jar, tightly sealed with a lid and store at room temperature (187aboutC, a pressure of 30 Torr 760, relative humidity 7010%). The second portion of the postmark on the day of manufacture are used to determine its properties and obtain the damping coatings. This mastic on temperame articles of the compositions can be added to 30 g of water). Drying time mastic to technological readiness at 20aboutWith no more than a day.

Test specimens of mastic and coating is carried out in accordance with the following methods.

1. Determination of temperature-frequency characteristics of the coefficient of energy loss of Flexural vibrations of plates, damped coating, for guidance 74-0109-25-80. The size of the plates HH(4-6) mm or HH(1,5-2,0) mm Material plates of steel, aluminum. Method of coating: the standard production diagrams and instructions.

2. Determination of adhesive strength of the coating to the steel shear according to GOST 14759-69.

3. The definition of material Flammability vibration-absorbing coating according to GOST 12.1.044-84.

4. Definition of measure thixotropy for TTP 743.4152-027-88.

5. The definition of mobility mastic according to GOST 5802-86.

6. The determination of the density of the postmark on THE 6-05-041-958-89.

Properties of mastics and coatings from her example 1 and subsequent examples are presented in table.1 and 2.

P R I m e R s 2 5. Vibration mastics prepared according to example 1, but varying the composition in the inventive examples.

P R I m e R s 6-9 (control prototype). Vibration mastic nd the data, application of the proposed formulation allows to completely stabilize the main technological properties of the vibration-absorbing resin during the month, while the famous mastic [2] lose in similar conditions to 25-30% of its effectiveness. Mastic in the present conditions of the composition provides optimal properties.

VIBRATION-absorbing RESIN, comprising water plasticized polyvinyl acetate dispersion, nepheline flame retardant and crystalline graphite, characterized in that it additionally contains chalk and alkylbenzyldimethylammonium in the following ratio, wt.

Water plasticized polyvinyl acetate dispersion with a dry matter content of 40-60 wt. 39,4-56,0

Nepheline flame retardant 11.8 to 19,0

Crystalline graphite 26,0-42,0

Chalk 2,2-8,0

Alkylbenzyldimethylammonium of 0.5 to 4.6

 

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