SU729066A1 - Method of oftaining loose powder of natural rubber or rubber composition - Google Patents

Description

materials, there is added chalk, heated to a temperature in an excess amount. The composition is stirred at a temperature of 80-100 ° C for 15-20 minutes. After mixing, the crumb of rubber or rubber mixture is separated from the excess chalk on the vibrating screen and the remaining chalk is then washed with a 20% solution of hydrochloric acid in a stirred vessel with intensive mixing. After washing, the rubber film is modified with sodium hypochlorite containing 8: s / l active chlorine for 40 minutes on the surface of rubber particles. Then the crumb is washed with water and dried at a temperature of 60-80 ° C. SKD SKS, BSK, SKI-3 are presented in Table 1,

Table 1

The content of the antiagglomerator in rubber 2-6 wt.%

Example 2. Preparation of non-adherent crumb rubber mixture (on axial rubber SKD, SKI-3, SKMS ZOARKM-15).

In a mixer for powdered materials, a composition is prepared consisting of zinc oxide and magnesia at a ratio of 1: 2. The resulting composition is introduced into chloroprene latex L-7 with stirring.

Chloroprene latex L-730%

Composition 5%

Sun a65%

The rubber mixtures are ground in a crushing plant of the type DKU-M together with the prepared dispersion. After grinding the rubber mixtures, the mass obtained after filtration is contained in the ingredients.

Ingredient Rubber Mixes

ACS.

OKMS ZOARKMSKI-3

Sulfur

Altax

loaded into a mixer for powdered materials, there is added chalk, heated to a temperature in an excess amount. The composition is stirred at temperature 80 for 15-20 minutes. The crumb rubber mixture obtained after mixing is separated from the excess chalk on the vibrating screen and the remaining chalk is then washed with a 20% hydrochloric acid solution. The washing of chalk from the crumb occurred in a vessel with a stirrer with vigorous stirring. After washing, the rubber film contained on the surface of the crumb particles of the rubber mixture is modified with sodium hypochlorite containing 8 g / l of active chlorine for 40 hours, then the crumb is washed with water and dried at a temperature of 60-80

The composition of rubber mixtures represented 3 tabLy 2

Table 2 weight%

luO 1.0 0.6

Ingredients

Santokur dfg

Stearinova

acid

Zinc oxide

Rubraks Neozon D. Physico-mechanical characteristics of the flowability of crumb rubber compounds

7290664

Continuation of table 2

The content of the ingredients of rubber compounds, wt.%

3.0

1.0, 5.0 -

The table based on SKD, CKMC-30APKM-15, iCKH-3 is presented in Table. 3

Claims (1)

Claim A method for producing loose crumb of rubber or rubber mixture by treating it with a polymer latex composition containing a vulcanizing group followed by curing and drying a film formed on rubber particles, characterized in that, in order to improve the crumb loose properties, the treatment is carried out with a chloroprene latex composition followed by stirring with chalk in an amount of 50 100 parts by weight per 100 parts by weight rubber or rubber mixture at a temperature of 80 ° C for 15-20 minutes, by washing 50 chalk with a 10-40% hydrochloric acid solution and treatment with a hypochlorite solution with an active chlorine content of 2-160 g / l.