RU1798353C - Method of preparing pigment as a filter contenting finely dispersed potassium and silica product - Google Patents

Abstract

Field of use: production of synthetic rubber and rubber. SUMMARY OF THE INVENTION: Granular slag - a waste product of phosphoric salts is mixed with phosphoric acid with a concentration of tQ-75% at a slag / acid ratio of 2: 1. The resulting mass hardens and is crushed. The product is white in color with a specific surface area for phenol adsorption of 20 ± 5 m2 / g, Rubber (cargo breaker) with this product as a filler has an unconditional strength of 187 MPa, an elongation of 480%, 4 tab.

Description

The invention relates to techniques for producing a white filler for elastomers from calcium and silica-containing raw materials and can be used to make, for example, tire rubbers.

The aim of the invention is to simplify the process of obtaining a finely divided product with the possibility of using it as a white filler of elastomers.

The method consists in the fact that granular slag is a waste product of phosphoric salts containing calcium and silicon oxides, is reacted with phosphoric acid with a concentration of 70-75% at a slag / acid ratio of 2: 1, followed by grinding the resulting product.

During the decomposition of slag having a complex chemical and mineral composition, complete phosphating occurs. This reaction ends in a relatively short time during which an insoluble bulky mass of so-called phosphate carbon black is formed. The exothermic reaction proceeds at room temperature until the phosphoric acid is almost completely consumed.

Example, The process for producing phosphate carbon black by this method is carried out in the following ways. Granular slag of the phosphoric salts plant is used, containing, wt.%: 5X2 42.20; 1.77; CaO 42.49; MdO 3.07; CaFa 4.99; P205 1.13; Na20 + K20 0.61; FeOO.10; Mnp. 0.17; S 0.46; ppp. 56; % 98.55.

"

H |

HO 00

with

01 SDE

For mixing, a spherical porcelain bowl is used, and the mixture of slag and acid is mixed with a metal spatula, vigorously grinding the mass for 1-2 minutes, resulting in a uniformly mixed dough. After that, the normal density of the test is determined. When using / acid with a concentration of 75%, a density of 1.579 g / cm3 with a weight ratio of W: T 0.75, setting time 20-23 minutes. l

As the acid concentration decreases, the ratio of the amounts of metal oxides and P20g in the plastic dough changes, which ultimately leads to a decrease in the strength of the resulting stone. This is due to the fact that the P2U5 in the mixture is insufficient to bind the oxides to phosphate and some of them. acts as a filler. /. /,:v.p :.

The fineness of grinding is determined by the remainder of the phosphate sample taken in the densely on a sieve with a mesh size of 0.5 mm in percent of the initial mass of the sample .:, - ..;

The best processing conditions for phosphoric slag are achieved with a 2: 1 ratio of slag to phosphoric acid.

The acid concentration in this case ranges from 70-75% (density 1.520-1.579) :; :

. The properties and characteristics of the phosphate carbon black according to the invention in comparison with white carbon black are given in table 1.

The rubber mixture of a cargo breaker was tested with the complete replacement of BS-120 soot with phosphate soot obtained from waste from a phosphorus plant - phosphoric slag. To this end, a rubber mixture containing 100 parts by weight is prepared. rubber 5 parts by weight phosphate soot.

Rubber mix cargo breaker was made on PC 250 / 40-1 st., PC 250 / 30-11, production of rubber mix

mixing was carried out according to serial modes.

In terms of physical and mechanical properties, rubber using phosphate carbon black according to the invention is inferior to serial in terms of conditional tensile strength at break, below the norm by 20 units (Table 2).

However, from the data given in Table 3, the bond strength of the experimental rubber compound estimated by the H-method is not inferior to the serial one.

The bond strength between the elements of the experimental tire is higher than the serial (Table 4).

Better bonding between the rubber filling elements is due to a higher dispersion of the active phosphate carbon black in the rubber and better polymer-filler interaction.

Thus, the use of phosphate carbon black as a modifying additive makes it possible to completely exclude BS-120 brand soot deficient white carbon black from the formulation of frame rubbers, provided that the product meets the developed technical requirements;

Formula and shade A method for producing a filler pigment of calcium and silica-containing finely divided product, comprising mixing material based on calcium and silicon oxides with phosphoric acid, grinding the product of the interaction of the mixture components, characterized in that, in order to simplify the process with the possibility of using the target of the product as a white filler of elastomers, granular slag is used as the starting material - a waste product of the production of phosphoric salts, and phosphoric acid is taken with a concentration of 70-75% and the process is carried out with a ratio of slag and acid 2: 1.

Table 1

Characterization of white and phosphate soot

Index

Appearance

Mass fraction of silicon dioxide,% not less

PH of an aqueous extract Losses in mass upon ignition,% Moisture not more than

Mass. Fraction of fluorides F,% no more than Bulk density, g / l Specific surface area of phenol adsorption, m2 / g

Residue on a sieve from 014 K in accordance with GOST,% no more Residue on a sieve from 005 K in accordance with GOST,% no more

The level of physical and mechanical properties of rubber compounds

:; Ta bl i c a 3

Bonding strength rubber m / cord (n-method) based on serial and experimental (using phosphate soot) rubber compound

Norm for grades BS-120, GOST 183 07-78

Phosphate soot

Toxidispersed white powder

87

phosphates 97-99

ruets

4.7-6.5 7.0-7.2 3.9-6.9

1042-1050

20 ± 5

49.7

± 15

table 2

Table 4

Statistical data on the level of physical and mechanical quality indicators of tires 300-508Р before bench tests

The name of indicators

Cargo assortment

Name of rubber

Conditional stress at 300% elongation, MLA Conditional tensile strength,

; .....: MPa .. Relative elongation,% Tear resistance, kN / m

Hardness units - .. Bonding strength during delamination,

;; .: .... kn / m

tread-b recker breaker-breaker breaker-carcass carcass-carcass; ...

side frame

Characteristics of indicators

300-508 P mod. IN-68A is experienced

sidewall

tread

4.9

17E)

700

65

00-508P

erina

13,2

13.1

13.1

7.9

10.7

4.3

18.9

578 - 77

58

300-508P experienced

16.1

18.6

18.6

8.3

13.0