SU834054A1 - Powdered coating composition - Google Patents

Description

one

The invention relates to protective coatings based on polymeric powder compositions and can be used to protect products used indoors.

A known polymer composition containing an organic binder, a filler and a blowing agent. Coatings based on this composition have heat insulating properties and a rather high heat resistance of 1 J.

However, the composition has low strength properties, high complexity in the preparation of compositions and applying it to the product.

Closest to the proposed technical essence and the achieved result is a powder composition for coatings, including polyvinyl butyral, low and high pressure polyethylene and rosin 2.

Coatings based on this composition have a high thermal conductivity, which does not provide them with heat insulating properties, and also has insufficient heat resistance.

The purpose of the invention is to increase the thermal insulation properties and weather resistance of coatings.

This goal is achieved by the fact that the powder composition for coatings, including polyvinyl butyral, high-pressure polyethylene and rosin, additionally contains carbon black and azodicarboxylic acid diamide or N, N-dinitrosopentamethylene tetramine in the following ratio, wt. %:

Polyvinyl butyral 61-75 High Pressure Polyethylene 16-20 Rosin 3-7

Soot5-9 3 Diamide of azodicarboxylic acid or N-N-dinitrosopentamethylenetetramine 1-3 In the composition for coatings, either diamidazodicarboxylic acid (porophore grade CHZ-21) with decomposition temperature of 170-190 ° C, MP, gas number 200, lib N / M-dinitrosopentamethylenetetramine porophore brand CHZ-18 with T. pl, UOs, decomposition temperature 2) 0-220 C and gas number 200-230 cm- / g. The invention is illustrated by the following examples of the specific formulation of the composition. Example. Polyvinylbutyral powder (PVB) (GOST 9439-73) jMapoK LA or LB in an amount of 61 wt. and high pressure polyethylene powder NIN (LDPE) (GOST 16337-70) in an amount of 20 wt. % is loaded into a ball mill and mechanically mixed therein for 20 minutes until the components are mixed evenly after. of which, in a ball mill of the charge from soot gas channel brands DG-100 (GOST 7885-77) in an amount of 9 wt.%, and continue mixing for: 10 minutes, then separately prepared mechanical mixture of fine rosin powder (fraction 50-) will be mixed into the ball mill 150 microns (GOST 19113-73) with porous 4X3-21 (TU-6-03-408-76) in quantities by weight, respectively, and 3, and the composition is mixed for two minutes while the components are being crushed while grinding . At the end of the mixing, the finished composition is discharged from the ball pellet and used for coating products by any means known for powdered polymeric materials or packaged in plastic bags.When storing the composition in another container, before applying it to the product, check for moisture {allow no more than 0.3% L 4 If necessary, the composition can be dried at -60- 80 seconds for 30-60 minutes on bins with a bulk layer of not more than 3 cm. EXAMPLE 2. Polyvinyl butyral powder (GOST 9439-73) of grades LA or LB in an amount of 75 wt.% And high pressure polystyrene powder. (GOST 16337-70) in the amount of 16 wt.% load in a ball mill and the fur is mixed in it for 30 minutes until the components are evenly mixed, after which the gas channel channel DG-100 (GOST 7885-77) is loaded into a ball mill in an amount of 5 wt.% and the mixing is continued for 10 minutes. then, a separately prepared mechanical mixture of fine rosin powder (fraction 50-150 microns) OST 19113-73) with the CHZ-18 brand lorophore in quantities by weight, respectively, 3 and 1, are mixed into the ball mill and mixed with the simultaneous grinding of the components for more 30 min. Examples using other quantities of the components of the composition and control examples prepared in the same way, as well as the properties of the resulting coatings are presented in the table. Laboratory tests of the physicomechanical properties of coatings based on these compositions were carried out on standard instruments twice, immediately after applying the prepared composition to the samples and after testing the coatings for atmospheric resistance according to the method of acceleration of the IP-1-2 artificial weather test apparatus. The proposed powder polymer composition reduces the thermal conductivity of the material, i.e. gives the coating its thermal insulation properties, increases the strength properties of the coating and increases its weather resistance.

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Claims (2)

 m r c a. 5183405 Formula of the Invention A powder composition for coatings, including sub-vinyl butyral, high-pressure polyethylene and KH-5 foil, which is different from the fact that, in order to increase its thermal insulation properties and weather resistance, coatings, it additionally contains carbon black and azodicarbonic acid diamide or M, N-dinitrosopentamethylenetetramine in the following ratio of components, weight. %:, Polyvinyl butyral 61-75 High-density polyethylene15 pressure 16-20 2 Rosin3-7 Soot5-9 Diamide of azodicarboxylic acid or N, N-dinitrosopentamethylenetetramine 1-3 Sources of information, .nP "" "™ e id. attention during examination 1. USSR Author's Certificate No. 268972, cl. from 08 L 27/06, 1968. 2. USSR author's certificate in application number 2669984 / 23-05, cl. C 09 .D 3/74 (prototype).