SU767147A1 - Acrylate rubber-based rubber mixture - Google Patents

Description

The invention relates to rubber industry, in particular to the development of rubber mixtures based on acrylic rubber. A rubber compound based on acrylate rubber is known to include. the filler is carbon black, stearic acid, antioxidant, sulfur, and alkaline or ammonium carboxylic acid l. The rubbers obtained from the known mixture have low physical and mechanical properties. The purpose of the invention is to improve the physicomechanical properties of rubber from a known mixture. The goal is achieved by the fact that the rubber mixture based on acrylate rubber includes a filler — carbon black, stearic acid, antioxidant, sulfur, and alkali or ammonium carboxylic acid — contains carbon black modified with 0.5–30 wt. . h. aminoalkylalkoxysilane, in the following ratio of components, parts by weight: Acrylate rubber 100 Stearic acid 0.5-2 Antioxidant 0.5-2 Sulfur. 6.5-1.5 Alkaline or ammonium salt of carboxylic acid2-4.5 Carboniferous, modified 0.5-30 parts by weight aminoalkylalkoxysilane 35-65 Example 1. In a laboratory, rubber mixer when loading BAKV-2 butyl acrylate rubber 1900 g, a rubber mixture of the following composition is prepared, parts by weight: rubber BAKV-2 lOOJ stearic acid 1.0; neozod D 2.0; potassium salt of oleic acid 3,5; sulfur 0.5; PM-75 carbon black containing 5 weight parts. -aminopropyltriethoxysilane (the latter is introduced into the soot during its wet granulation by mixing dusty soot with a 5% aqueous dispersion of Y-aminopropyltriethoxysilane in a 1: 1 weight ratio, followed by drying the granulate). In parallel, two control mixtures of the same composition were prepared, but containing 50 parts by weight. carbon black PM-75, unmodified) -aminopropyltriethoxysilane; at the same time, one of them is introduced during its preparation in a rubber mixer simultaneously with the soot PM-75

) -aminopropyltriethoxysilane. in the amount of 100 weight.h. rubber

Vulcanization of test and control rubber compounds based on acrylate rubber is carried out at a temperature of 15 minutes.

Rubber properties are shown in Table 1. How do I get out of data analysis. 1, the properties of rubbers based on butyl acrylate rubber and carbon black PM-75 with jf-aminopropyltriztoxysilane adsorbed on it exceed the known rubber in all respects.

Example 2. In order to confirm the preservation of aminoalkylalkoxysilanes adsorbed on the surface of soot, aminopropyltriethoxysilane carbon black compositions containing aminosilane 5 per 100 parts by weight are prepared. soot.

Based on this modified carbon black, a rubber mixture is prepared once a week for a month according to the recipe given in Example 1 (experiment). For the control, a similar rubber mixture is prepared using the original PM-75 carbon black, added to the rubber mixer at the same time, with carbon black carbon dioxide –aminopropyltriethoxysilane (control), which was stored in the jar for the entire test period. The resulting mixture of volcanic -. cry and experience.

Data on the strength of the vulcanizates and the coefficients of the zlastichesky recovery at a temperature are given in table. 2

As follows from the data analysis table. 2, γ-; aminopropyltriethoxysilane after 7 days of storage, introduced into the rubber mixer simultaneously with the soot when preparing the rubber mixture based on acrylate rubber, lost its activity, while U-aminopropyltriethoxysilane adsorbed on the surface of the soot was highly active after 30 days of storage.

Example 3. The process is repeated. as in example 1 using carbon black modified with a different amount of Ji-aminopropyltristoxysilane. .

Change in tensile strength of PE5 ZIN from a mixture based on butyl acrylate rubber and PM-75 soot modified with different amounts of - α-aminopropyltristoxysilane

Thus, rubber from the proposed mixture (in comparison with rubber from a known mixture) is characterized by enhanced physical and mechanical properties.

Properties of rubber from rubber mixtures based on butyl. Acrylate rubber and carbon black PM-75 with 5C-aminopropyltriethoxysilane adsorbed on it

 T a b l i

Elongation stress. 100%, kgf / cm

. Resistance to rupture, kgf / cm

Relative extension , %

Residual elongation,%

: - Ch.: - - - - - - - - - -f .-- .-.

Brittleness temperature, s.

c a

53

144

230

eight

-25

Elastic recovery coefficient at:

-10 ° C

-15 ° С Hardness according to TM-2

Aging in air at 150 ° C for 3 days by strength

Swelling in oil,% Grassees abrasion,

cm / KW h

Changes in the properties of rubbers from mixtures based on acrylate rubber, characterizing the activity of y-aminopropyltriethoxysilane over time

Continued table. i

0.48

0.50

0.28

0.33

62

62

99

109 11.3. 10.1

580

550

table 2

Claims (2)

Claim Acrylate rubber-based rubber compound, including filler- * carbon black, stearic acid | antioxidant ·, sulfur and an alkaline or ammonium salt of a carboxylic acid, characterized in that, in order to increase the physical and mechanical Antioxidant Sulfur Alkaline or ammonium salt of carboxylic acid Carbon black Modified 0.5-30 parts by weight aminoalkylalkoxysilane 0.5-2 0.5-1.5 2-4.5 35-65 properties of rubbers from this mixture, the latter contains carbon black modified 0.530 parts by weight as a filler. aminoalk'ylalkoxysilane