SU1583439A1 - Cooling fluid for systems with rubber seals - Google Patents

Abstract

The invention relates to the manufacture of internal combustion engines, in particular a coolant for systems with rubber seals. The goal - reducing the aggressiveness of the liquid. The latter contains 0.02-1% by weight (dimethylaminomethyl) phenol derivative in water with nitrito-phosphate, nitrito-silicate or nitrito-phosphate-chromate additives. The relative elongation, tensile strength and tearing of the rubber after exposure to a fluid with an optimal content of 2, 4, 6-tris (dimethylaminomethyl) phenol is 1.3-1.6 times more, and swelling is 1.3-1.9 times less, than after exposure to a nitrito-phosphate additive water. 3 tab.

Description

The invention relates to the engineering industry for the production of internal combustion engines and locomotives, railway transport and other branches of the national economy in which devices are cooled or cooled by water-based fluid circulating in a system with rubber seals.

The purpose of the invention is to reduce aggressiveness to rubber coolant.

Examples 1-8. Coolants based on treated (ion exchange method, electrodialysis, reverse osmosis, condensation of waste steam) water with a nitrite phosphate additive contains 0.02 - 1.0% by mass. 2,4,6-tris- (dimethylaminomethyl) phenol . For comparison, water-based coolants with nitrite-phosphate additives containing 2,4,6-tris (dimethylaminomethyl) phenol in dosages outside the proposed limits, as well as those not containing it, are also tested.

The water (condensate) used to prepare the coolant meets the following requirements: total hardness not more than 0.2 meq / l; chloride content is not more than 10 mg / l; total alkalinity of not more than 0.6 mEq / l by methyl orange; dry residue not more than 50 mg / l.

All tested nitrite-phosphate additive coolants meet the following requirements: the content of phosphoric anhydride RDO $ - (introduced in the form of trisodium phosphate

cl

00

with

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with so

Na3P04

31

12HO) 15-25 mg / l; the content of sodium nitrite NaNO 2500 - 3000 mg / l; alkalinity for phenolphthalein 1.5-2.5 mEq / l; pH 10.5-11.5.

Samples of technical rubber based on a combination of polychloroprene rubber (nairite) and butadiene nitrile rubber SKN-18 in a 1: 1 ratio (rubber 1) and based on a combination of butadiene nitrile rubber are subjected to the aggressive influence of cooling fluids at 115 ° C for 100 hours. - SKN-18 and SKN-26 forks in a 1: 1 ratio (rubber 2).

The initial (prior to contact with cooling fluids) physicomechanical indicators of the tested rubber are:

Rubber 1 Rubber 2 Conventional strength at break, MPa 10.8 13.6 Relative elongation at

% 385 215 Resistance

tear, kN / m 37 48 The content of 2,4,6-tris (dimethylamine nomethyl) phenol in cooling fluids and the characteristics of the aggressiveness of the effect of these liquids on rubber are given in table. one.

As follows from the data table. 1, all the cooling liquids of the compositions restraining 0.02-1.0% 2,4,6-tris- (dimethylaminomethyl) phenol, less aggressive towards rubber than the cooling liquid without it (composition 1), and The dependence of the physicomechanical parameters of rubber (after exposure to a cooling fluid) on the content of 2,4,6, -tris- (dimethylaminomethyl) phenol in the liquid is extreme.

Thus, the relative elongation, tensile strength and tearing of the rubber after exposure to cooling liquids of minimal aggressiveness (compounds 5 and 6) with an optimal content of 2,4,6-tris (dimethylaminomethyl) phenol (0.1-0.5%) 1.3-1.6 times more, and swelling 1.3-1.9 times less than after exposure to a known liquid (composition 1) without 2,4,6-tris- (dimethylaminomethyl) phenol.

Water-based coolants with nitrite-phosphate additive, containing 0.01% (composition 2) and 2.00%

Q

five

four

.

five

0

0

394

(composition 8) 2,4,6-tris- (dimethylamino-methyl) phenol, t „e„ in dosages that are outside the proposed range (0.02-1.00%), in terms of their aggressive effect on rubber, are close to coolant without 2, 6-tris (dimethylaminomethyl) phenol. Moreover, the cooling fluid of composition 8 in terms of a change in some rubber indicators (tear resistance and relative elongation of rubber 1, swelling of rubber 1 and 2) even exceeds the aggressiveness of the known coolant. Since during the production of 2,4,6-tris- (dimethylaminomethyl) phenol a mixture of mono-, di-, and tris- (dimethylaminomethyl) phenols is obtained as an intermediate product, their effect on the aggressiveness of water-based cooling liquids is also tested. rubber.

Examples 9-12. Coolants based on treated water (condensate) with nitrite-phosphate additive containing mixtures of 70% 2,4,6-tris- (dimethylaminomethyl) phenol with 30% 2,4-di (dimethylaminomethyl) phenol (mixture 1 - compounds 9 and 10) or a mixture of 20% 2,4,6-tris- (dimethylaminomethyl) -phenol with 50% 2,4-di (dimethylaminomethyl) phenol and 30% 2- and 4-mono (dimethylaminomethyl) phenol (mixture 2 - compounds 11 and 12) in optimal dosages of 0, | 0% (compounds 9 and 11) and 0.50% (compositions 10 and 12).

The content of mixtures (dimethylaminomethyl) of phenol derivatives in cooling fluids and the characteristics of the aggressiveness of the effect of these liquids on rubbers are given in table. 2. For comparison, table. 2 also shows the indicators of aggressiveness to rubber known coolant that does not contain (dimethylaminomethyl) phenol derivatives, and coolants containing 0.10% (composition 5) and 0.50% (composition 6) 2,4,6-thatis ( dimethyl-aminomethyl) phenol.

As follows from the data table. 2, the aggressiveness to rubber of coolants containing the same dosages of 2,4,6-tris (dimethylaminomethyl) phenol, mixture 1 and mixture 2 is almost the same, and the performance of each of the tested rubber after raising these liquids is approximately the same level

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The same positive effect was obtained when 0.02-1.0% (dimethylaminomethyl) phenol derivatives were introduced into water-based cooling liquids containing nitrite-silicate or nitrite-phosphate-chromate additives. The effect of the additive on the performance of rubber in liquids of different composition is given in Table. 3

Content in water-based coolants (with nitrite-phosphate nitrite-silicate or nitrite-phosphate-chromate additive) 0.02-1, 0% (dimethylaminomethyl) phenol derivatives

practically does not reflect on the corrosive, makipeforming and foaming ability of liquids.

Claims (1)

Invention Formula Coolant for rubber-based systems water, characterized in that, in order to reduce the aggressiveness of the liquid to rubber, it additionally contains (dimethylaminomethyl) - a derivative of phenol in the amount of 0.02-1 May D. Conventional strength at stretching% 2 Relative elongation at 1 break,% 2 Resistance1 tear,% 2 Change May-1 sy,% 2 Table 1 Table 2. Note-ing. The compositions of the cooling tank are: 13 and 14 - beat ant and corrosion additives 1, 5, 15 and 16 - with nitrite-phosphate anticorrosive additive; 17 i) 8 - with nitrite-silicate additive; 19, 20, 21, 22 - with nitrito-phosphate-chronztny additive. Table 3