Vibration-absorbing resin

 

(57) Abstract:

Use: for the in-situ coating of marine areas. The inventive vibration mastic contains the following components, wt. polyvinyl acetate dispersion obtained by redispersion powder of polyvinyl acetate in water containing a 15.7-22.0 powder of polyvinyl acetate and 26.5-40,0 water, the plasticizer is glycerol triacetate 3,5-7,0, nepheline flame retardant 12,0-14,5, crystalline graphite 22,0-28,0, chalk 4,5-11,0, alkylbenzyldimethylammonium of 1.5 to 5.8. table 2.

The invention relates to a vibration-absorbing compositions for coatings, in particular for in-situ coating areas of the vessel.

Known vibration-absorbing resin, comprising, by weight. plasticized polyvinyl acetate dispersion (PVAD) 42,6 51,6, nepheline flame retardant 9,6 10,6, crystalline graphite 32,3 34,0, modifier chloroparaffin of 6.5 to 12.8 [1] Floor it has good performance characteristics: high vibroacoustic characteristics and adhesive properties, low Flammability.

However, the stability of the main vibro-acoustic properties over time he has insufficient for 3 years of operation, the loss factor of the damping coating the political essence and the achieved effect to the invention is a vibration-absorbing resin, comprising, by weight. water PVAD, plasticized with dibutyl phthalate, 45,5 50,0; nepheline flame retardant 14,0 18,0; crystalline graphite 36,0 40,0 [2] the Coating of this mastic has a high, stable vibroacoustic characteristics (coefficient of losses for 3 years reduced by no more than 8 to 12%), good adhesion and low inflammability.

However, the stability of the technological properties of the mastic is not high enough: after 3 to 5 days after making the paste begins to lose mobility, and after a month of storage mobility falls about 3 times. The paste thickens, which leads to a number of negative consequences: it is difficult RESTOREPATH thick mastic as it does not shed, it is necessary to pick out manually; unloaded the baby doesn't turn into a homogeneous mass by prolonged stirring and adding additional quantities of water. Lumpy mastic difficult to apply with a spatula, and mechanized spraying is simply impossible, because the clumps clog the nozzle of the spray device. Vibroacoustic damping performance of the coatings of thick mastic 25 to 30% lower than that of the coatings of fresh putty.

Thick mastic becomes unsuitable is, it is difficult to provide immediate full use of fresh putty. Therefore, the task of improving the stability of the technological properties of the putty becomes one of the most important.

The purpose of the invention improve the stability of the technological properties of the vibration-absorbing putty in time.

This objective is achieved in that the vibration-absorbing resin including polyvinyl acetate dispersion, plasticizer, nepheline flame retardant and crystalline graphite, additionally contains chalk, alkylbenzyldimethylammonium (ABP), as polyvinylacetate dispersion dispersion obtained by redispersion powder of polyvinyl acetate in water as a plasticizer triacetate of glycerol, in the following ratio, wt. Redispersible powder polyvin - ilaclama 15,7 22,0 Plasticizer 3,5 7,0 Water 26,5 40,0 Nepheline anti - pyrene 12,0 14,5 Crystalline graphite 22,0 28,0 Chalk 4,5 11,0 Alkylbenzene - dinihari 1,5 5,8

The structural formula ABP can be represented as follows:

CH CHNClwhere n 2 5.

To receive mastic use of manufactured products: redispersible powder of polyvinyl acetate (Ballycasey graphite casting according to GOST 5289-74; ABP on THE 6-01-1026-75.

P R I m e R 1. Vibration-absorbing resin is prepared in a glass beaker with a capacity of 2 l, using for mixing laboratory stirrer speed of 100 rpm, and temperature control water bath. At the first stage in a glass pour 313 ml of distilled water, in which when the stirrer for 10 min, poured evenly 157 g RPPA. The temperature in the bath support 35aboutC. After the introduction of the powder of the polymer for 30 min homogenize the resulting dispersion, and then the stirrer is switched off and within 72 hours shall maturation of dispersion, including mixing device for 15 minutes every 6 hours

In the second stage, prepared as described above PVA-variance consistently administered during the mixing 35 g TAG, 240 g KG, 145 g, 80 g of chalk and 30 g ABP. The fillers are added in small portions to avoid clumping. The time of homogenization of the composition 3 hours After obtaining a homogeneous mass mastic divided into two roughly equal parts. One is placed in a plastic jar, tightly sealed with a lid and put in storage at room temperature (187aboutWith 9 pressure 76030 Thor, relative humidity 7010% ). The second portion of the coating. This mastic on temperame products put spacelanes or by spraying. Drying time mastic to technological readiness at 20aboutWith no more than a day.

Test specimens of mastic and formed from it, 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. Plate size 750 x 500 x (4-6) mm or 500 x 150 x (1,5-2,0) mm Material plate aluminum. Method of coating: the standard production diagrams and instructions.

2. Determination of adhesive strength of the coating to primed steel 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 6-05-958-89.

Properties of mastics and coatings from it are presented in table. 1 and 2.

P R I m e R s 2 5. Vibraphone mastics prepared according to example 1, but varying the composition claimed in redelegate example 1 analog 2. Properties of mastics and coatings from it are presented in table. 1 and 2.

As can be seen from the table. 1 and 2, the vibration-absorbing resin according to the invention is not thickens upon standing and its technological properties remain the same as the damping properties of coatings made from freshly prepared and aged mastics. The vibration of the postmark on the prototype (example 6K, PL. 1) for the month of standing mobility is reduced three times.

VIBRATION-absorbing RESIN including polyvinyl acetate dispersion, plasticizer, nepheline flame retardant and crystalline graphite, characterized in that it additionally contains chalk, alkylbenzyldimethylammonium, as polyvinylacetate dispersion dispersion obtained by redispersion powder of polyvinyl acetate in water as a plasticizer triacetate of glycerol in the following ratio, wt.

Redispersible powder of polyvinyl acetate 15,7 22,0

The triacetate of glycerol 3,5 7,0

Water 26,5 40,0

Nepheline flame retardant 12,0 14,5

Crystalline graphite 22,0 28,0

Chalk 4,5 11,0

Alkylbenzyldimethylammonium 1,5 5,8

 

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