SU1615389A1 - Composition for stabilizing dust-releasing surface - Google Patents

Abstract

The invention relates to the mining industry and can be used for fixing dusty surfaces of dumps, pit walls, road shoulders. The purpose of the invention is to increase the mechanical strength of the coating and make the coating resistant to the destructive action of ice. The composition contains the following components, wt%: styrene-butadiene latex (rubber) 1-5

acetone formaldehyde resin 0.15-1.0

caustic soda 0,2-0,3

water - the rest. The introduction of caustic soda of greater concentration or in an amount that provides PH latexes above 11 is impractical, since the destruction of the colloidal system of latexes occurs and the coagulation of rubber begins. Caustic soda in the composition performs the role of hardener. 3 tab.

Description

The invention relates to the mining industry and can be used to fix dusty surfaces of dumps, pit walls, roadsides.

The aim of the invention is to increase the mechanical strength as well as the resistance of the crust to the destructive action of ice by incorporating a rubber enhancer into the latex composition.

The composition for fixing the dusty surfaces includes styrene-butadiene latex, acetone-forming resin, caustic soda and water in the following ratio, wt.%:

1-5

0.15-1.0

0.20-0.30

Rest

Styrene butadiene latex (on rubber) Acetone-formaldehyde resin: Caustic soda Water

For experimental verification, the SCS-65 GP and SCS-30 latexes were taken, which were diluted with water to a concentration of 1; 2; 3; four; five%. The first in latex introduced. d t 10% caustic soda in an amount to bring the pH of the latexes to a value of 10-11, and then the acetone formaldehyde resin. Introducing caustic soda with greater concentration

ate

00

00

An IB quantity that provides for the latex pH of JCOB above 11 is impractical because it HAPPENS the destruction of the colloidal latexes and nodalization of the coagulum - KayttyKa. The pH of the solution was measured on an EV-74 universal ionomer. The tests showed that the addition of 100 ml of latex of any concentration of 0.20-), 30 ml of caustic soda ensures the pH of the solution to reach values of 10-11. The amount of caustic soda added to la- is. the resulting solution is agitated with an agitator with a speed of rotation of loops

ten

ti 1 s (60 rpm) for 20 mn. I The need for the initial introduction of caustic soda into latex, because it contributes to the removal of

15

20

thirty

wa

; the mulgator from the surface of the particles of the cluster and thereby ensures the direct contact of the rubber with the resin, which leads to the formation of a strong bond between them due to chemical interaction. Caustic soda in the composition additionally also plays the role of 25 hardeners of the resin.

In an experimental test, the amount of resin added to the solution is taken at the rate of 5,10,15,20, May, h. on 100 ma.ch. rubber, After the resin was added, the solution was stirred with a stirrer for 20 minutes.

The prepared solution was applied to the surface with an area of 50 cm using a gulverizer, which is represented by dust-like fractions of rocks with a size of 0-100 µm. The fixed rocks are in protvynx. At the same time on the surface of 50 cm spent 2 ml of solution.

The treated specimens are placed in a 1 п pymatic chamber of the stand and dried to constant weight at an air temperature and relative E = 25–30%. Then, specimens were subjected to mechanical testing for mechanical strength by pushing them with a 3 mm diameter needle on an ElecTHOM instrument.

The results of studies of the mechanical strength of the coatings formed by l | atex of different concentrations are given in Table. one.

As can be seen from the results table. 1, it is impractical to fix surfaces for aqueous solutions of concentration latexes above 5%, so the strength is not significant.

16153894

In tab. Figure 2 shows the values of the abnormal strength of the coatings obtained by fixing the surfaces with a mixture of diluted latex and acetone-formaldehyde resin at its different consumption per 100 hours of rubber.

As can be seen from the results of table 2, take resin consumption of more than 20 mach. on 100 ma.ch. rubber is impractical because the strength of the coating does not increase. The optimum should be considered consumption of 15-20 ma.ch. pitches on 100 mach. rubber

Then, the coatings formed by diluted latexes and a mixture of diluted latexes and acetone formaldehyde resin in a ratio of 100: 15 and 100: 20, studied the resistance to the destructive action of ice. For this purpose, the samples of fixed: rocks are placed in a pan, filled with water, placed in a climatic chamber and kept for 48 hours at a certain air temperature. The air temperature at which the series of experiments is carried out is -20, -30, -40, -50 ° C. At the same time, at night the temperature is raised accordingly to -5, -15, -25, -35 ° C. After keeping the samples under the ice for 48 hours at a certain temperature, the samples are removed from the chamber, thawed, placed in the climate chamber of the stand, dried to constant weight at an air temperature of + 30 ° C and its relative humidity of 25-30% and examined for makanicheskuyu sthenetdz. Then, the same samples were again placed in the pan, filled with water, placed in a chamber and held at a lower temperature for 48 hours, and the whole cycle of sample preparation for the strength study was repeated.

The results of studies of the mechanical strength of the samples after keeping in the chamber at a certain temperature are given in Table. 3

Experimental studies of the proposed composition of dL for fixing the dusting surfaces of the dumps showed that it allows to increase the mechanical strength of the coatings and lengthen the duration of their sunshine due to the resistance of the coatings to the destructive effect of ice. Formula of the invention

A bonnet for fixing dust on-j surface & i, including butadiene-35

40

45

1615389 h and garol latex and water, about t l and n and so that, in order to increase the mechanical strength of the coating and make the coating resistant to the destructive action of ice, it additionally contains acetone-formaldehyde resin and caustic soda at the following

the ratio of components, wt.%: Butadiene-styrene latex (for rubber) Acetone-formaldehyde resin Caustic soda Water

1-5

0.15-1.00

0.2-9.3 Else

Latex

Mechanical strength of coatings, kg / cm, at latex concentration,%

1; about 17 Gz about 7GEGL1: -.-- 1--1 ----- -----

 g

SKS-bzga 2.73 SKS-300.80

6.6812.62 16.42 17.85

1,836.84 11.80 12.50 1.96 P, 25

Table 1

Table 2

Tavlitsa

Claims (1)

The invention relates to the mining industry and can be used for fixing the dusty surfaces of dumps, sides of quarries, roadsides. The purpose of the invention is to increase the mechanical strength of the coating and making the coating resistant to the destructive effect of ice. The composition contains the following components, wt. X: styrene-butadiene latex (rubber) 1-5; acetone formaldehyde resin 0.151.0; caustic soda 0.2-0.3; water is the rest. The introduction of caustic soda of a higher concentration or in an amount providing a pH of latexes above 11 is impractical, since the colloidal system of latexes is destroyed and rubber coagulates. The caustic soda in the composition acts as a hardener. 3 tab. ^!