Polymer-lime paint

FIELD: construction engineering and manufacture of building materials for decorate and protective coats of building facades over concrete, wood, brickwork and asbestos cement.

SUBSTANCE: proposed paint contains 50-% polyvinyl acetate plasticized dispersion, 50-% lime paste, pigments and additionally it contains chlorinated polyvinyl chloride varnish XB-784.

EFFECT: enhanced adhesion at positive and negative temperatures; enhanced water-resisting property.

2 tbl, 6 ex

The invention relates to the construction and building materials, in particular paints for decorative and protective coatings facades of buildings, mostly on concrete, wood, brick, asbestzement.

Known oil paint based on natural drying oil, pigment, filler, drying agent and solvent.

/see the oil Paint brand MA-11n GOST 10503-71/.

The main disadvantage of it is the large consumption of scarce expensive vegetable oil, in a large drying period and in low weather resistance, the inability of the coating at high temperatures and low adhesion at low temperatures.

As described in the literature substances similar purpose the closest in composition is primerisima paint, wesc:

/see Masterstvo construction of the USSR. The Central Bureau of technical information. "Application of organosilicon substances in construction", M, 1971, p is .27/.

The disadvantages of paint are small adhesion at low temperatures, low resistance, large drying period at low positive temperatures, at low temperatures to (-3)-(-5)°is the emergence of Vasilov /white spots/, that is, the low quality of the coatings.

Problem solved paint is to increase the adhesion at positive and negative temperatures, increased water resistance.

This is achieved by primerisima paint comprising plasticized polyvinyl acetate emulsion /dispersion/, 50%lime putty, pigments, characterized in that it contains additionally perchlorovinyl lacquer XB-784 in the following ratio, parts by weight:

To prepare polimerizuet paint was applied polyvinyl acetate emulsion of plasticized DF/10C TO-028-00149274-97 JSC "Kalinin factory of rubber products" the Saratov region. Polyvinyl acetate dispersion, pastificio the data by dibutyl GOST 8728-66.

Perchlorovinyl lacquer XB-784 GOST 7313-75.

The CHV-784 lacquer is a solution of chlorinated polyvinyl chloride resin in a mixture of volatile organic solvents with addition of plasticizer.

In CHV-784 lacquer applied resin PSC-LS medium viscosity in a 10-25% solution in solvent R-4, and applied plasticizer sovol /policlorodifenil/ in the amount of 0.3 to 0.5 parts 1 parts perchlorovinyl resin.

see M. Livshits, B. I. Przyjalkowski. "Paints and varnishes". M.: Chemistry, 1982, str-191, 211/

The solvent R-4 GOST 7827-74 contains, wt%:

/see S.A., Grinberg, ET ICCO. "Solvents for paints and varnishes". L.: Chemistry, 1980, p.60/

Pigments: Red iron oxide GOST 8135-65,

Chromium oxide technical GOST 9808-65,

Ochre dry GOST 8019-71

Titanium dioxide pigment GOST 9808-65.

Building lime GOST 9179-70 Ozinsky a lime plant in the Saratov region Lime 1 St grade, activity 90%, lump.

Was investigated the adhesion and the water resistance of the proposed paint and paint the prototype.

For this we have prepared 5 formulations and one known paint with different content components, which are summarized in tab the Itza 1.1., and physico-mechanical parameters in table 1.2., and the examples.

Example 1.

In the tests used palmersville coating /paint/ the following composition, parts by weight: /concrete/

Pre-receive 50%limy dough by blanking Komkova lime investigation and the aging of lime in containers for two weeks.

Next, the limy dough is passed through a grid with cells 5×5 mm to remove large lumps of dough, then the dough is passed through the disk kraskoterke WITH a-110.

Then poured into the mixer dispersion DF/10C, after poured into the mixer, where the dispersion DF/10C, perchlorovinyl CHV-784 lacquer and pigment, and everything is stirred for 5 minutes at a speed of revolutions of the shaft of the stirrer 60 rpm until a homogeneous mass. After the mixer, pour the lime 50%dough and everything is stirred for 10 minutes to obtain a homogeneous mass. Then the contents of the mixer /mass/ flow through disk kraskoterke, is uniform in color and viscosity of polymerized what I paint, which is applied to the concrete samples at T=20°outdoors and at T=-5°S, T=-10°S, T=-15°S, T=-20°in the refrigerating chamber TU-U with mugs-spray and leave the samples in the chamber at the same temperature for 3 days, and after you check the gap on a tensile testing machine RM at loading rate of 25 mm/min and calculated by the formula

where P is the breaking load,

F - the area of the gap between the covering.

The adhesive strength of paint is determined by the test lead 8-10 stamps pasted on top of the paint rapid hardening mastic epoxy resin ED-20, utverzhdenii paatelainen, cement, taken in the ratio of 10:1:3 by weight.

The distance between the die and the edges of the specimen shall not be less than 2 cm after 24 hours curing mastic paint /coating/ cut around the perimeter of the stamp to the base, and not earlier than 2 days to determine the adhesion strength at a constant rate of change efforts in the instrument, is equal to 10 KS/s

The value of the adhesion strength of the coating is taken as the average of 8-10 default.

Used equipment.

Breaking machine RM.

Stamp /round steel plate with a smooth oil-free surface, diameter 20 mm, height 10 mm, with a hole in which is inserted a steel rod is of Ribera - 10 pieces.

Substrate /20×20 mm, covered with paint.

After pull-out test samples of paint from concrete showed adhesion after 3 days, MPa:

The water resistance of the ink is determined as follows.

Preparation of samples for testing.

Test the paint with the paint is applied in a single layer on a clean plate of black iron according OST 10086-69 "Methods of testing paints and coatings", MI. Getter film on the substrate and dried, first in air for 1 hour at a temperature of 18-22°C and then for 2 hours at a temperature of 65-70°then the plate is placed at 2/3 of the height of cover in distilled water and incubated for 2 hours at a temperature 13-22°C. Then the plate is removed, wipe clean with cotton wool and kept in air for 2 hours, after which inspect the appearance and color film.

The plate was aircraft is and polimerizuet paint of the following composition: parts by weight:

Appearance and color film remained unchanged.

Example 2.

The test is carried out as in example 1.

In the tests used polimerizuet paint /coating/ the following composition, parts by weight: /concrete/

After pull-out test samples of paint from concrete showed adhesion after 3 days, MPa:

Water: appearance and color film without modification.

Example 3.

The test is carried out as in example 1.

In the tests used polimerizuet paint of the following composition, parts by weight: /concrete/

After pull-out test samples of paint from concrete showed adhesion after 3 days, MPa:

Water: appearance and color film without modification.

Example 4.

The test is carried out as in example 1.

In the tests used polimerizuet paint of the following composition, parts by weight: /concrete/

After pull-out test samples of paint from concrete showed adhesion after 3 days, MPa:

Water: appearance and color film without modification.

Example 5.

The test is carried out as in example 1.

In the tests used polimerizuet paint of the following composition, parts by weight: /concrete/

After pull-out test samples of paint from concrete showed adhesion after 3 days, MPa:

Water: appearance and color film without modification.

Example 6 /Prototype/

In the tests used polimerizuet paint of the following composition, parts by weight: plasticized polyvinyl acetate, 50%emulsion - 14, 50%lime putty - 56, NGL-10 or NGL-11 - 3, color pigment /chromium oxide/ - 7, water - 20. First, the pigments are mixed in the mixer with water. The resulting paste fray on disk kraskoterke /to the consistency of not more than 20 μm on the micrometer/. In tank-mixer download the emulsion PVA, GKZ, lime paste, pigment paste and stirred for 1 hour. Before uploading, check the viscosity of the ink /20-25 seconds by the viscometer VZ-4/. Then the paint is filtered through a sieve with 900 holes on 1 cm².

The test is carried out as in example 1.

After pull-out test samples of paint from concrete showed adhesion after 3 days, M is:

Water: appearance and color film after tests at T=-5°With changed color film white /80%/.

The flow of adhesive processes, occur at low temperatures, due to the alkaline environment produced lime and volatilization of light fractions solvents R-4, creating conditions for structure formation.

Lime /high dispersion/ with PVA reinforced polymer binder /PVC-resin/ predetermine high adhesive strength.

The content of perchlorovinyl varnish less than 1 parts by weight causes a reduction in adhesion at positive and negative temperatures.

The content of perchlorovinyl varnish over 7% parts by weight leads to cracking of the coating at low temperatures and to reduce adhesion.

The use of the invention allows to increase the production of paint on existing capacities /lines/ year round release it, i.e. to increase the volume of the finishing work to reduce specific capital expenditure during storage and transport.

Primerisima paint, including the non plasticized polyvinyl acetate in 50%dispersion, 50%limy dough, pigments, characterized in that it additionally contains perchlorovinyl lacquer XB-784 in the following ratio, parts by weight: