DD219033A3 - REFRIGERATIVE AND BUTTER LUBRICANTS WITH CORROSION PROTECTION PROPERTIES - Google Patents

Abstract

The invention relates to a cooling and cooling lubricant with anti-corrosion properties on the basis of OH-containing organic substances and water. In this case, a nitrite-free agent with improved temporary corrosion protection, heat transfer coefficient and lubricating and cooling effect should be found. This is achieved by adding 5% to 15% butynediol as inhibitor.

Description

Cooling and cooling lubricants with anti-corrosion properties Application of the invention

The invention relates to a cooling and cooling lubricant with anti-corrosion properties. Characteristic of the known technical solutions

As the coolant or cooling lubricant aqueous media are used based on OH-containing organic substances. To prevent corrosion, temporary corrosion protection must be ensured. This is achieved by the addition of inhibitors based on sodium nitrite or in combination with other known inhibitors to the cooling or cooling lubricants. The use of sodium nitrite has the following disadvantages:

1. Toxic hazard during use;

2. High disposal costs as sodium nitrite is a pollutant pollutant;

3. In certain low concentration ranges, sodium nitrite causes a corrosive effect under the conditions of use; !

4. Evaporation of the aqueous phase is due to salt deposits to malfunction.

As inhibitors amines, borates, benzoates or phosphates are used but have the disadvantage that they act on relative fixed adsorption and thereby affect the heat transfer and the lubricating effect is negative. ¹ ' . ·.

Object of the invention

The aim of the invention is to develop a nitrite-free cooling and cooling lubricant, which has a high temporary corrosion protection effect against a wide range of materials, as well as a good heat transfer coefficient and a good lubricating effect. ,

Explanation of the essence of the invention

The object of the invention is to find a suitable inhibitor for cooling and cooling lubricants based on organic substances containing OH groups, which alone or in cooperation with other inhibitors in technically and economically acceptable concentrations, the o.g. Features guaranteed. It has been found that this is achieved by adding as inhibitor 5% to 15% butynediol, also in combination with other layer-forming inhibitors. A particularly advantageous composition is the following agent:

5% to 15% butynediol

5% to 91% glycols or polyglycols

4% to 50% of alkaline substances, such as alkanolamines, borates, benzoates or phosphates. As a surprising effect, the adsorption of the butynediols onto the metal surface occurred without the interfacial activity of other alkaline substances, such as borates, phosphates or alkanal amines being adversely affected.

Surprisingly, the adsorption layer built up not only inhibits but at the same time takes over the function of the lubricating film under boundary friction conditions.

embodiment

In embodiments, the invention is explained in detail. A table shows the quantitative advantages of the invention over known comparable refrigerating and cooling lubricants.

Example 1:

A coolant with the composition _; 22.0% glycol or polyglycol

3.5% phosphoric acid (80%), '. , ",

36.5% triethanolamine. /

30.0% glycerol

8.0% of butynediol as an aqueous solution is a metalworking fluid for metal cutting.

Example 2:

A cooling lubricant with the composition. , ,

30.0% triethanolamine

10.0% glycol or polyglycol *

12.0% butynediol ^

48.0% water

is a cooling lubricant in grinding technology as a concentrate or in further aqueous dilution.

-2- 238 965 5

Example 3: *

A coolant with the composition 90.0% glycoal or polyglycol 6.0% butynediol

2.0% borate. ,' ''

2.0% Na benzoate ....

is in aqueous dilution an antifreeze and preservative in closed Kühlkreisi, preferably in cars.

Trade Example Example Example

Product DDR 1 2. 3

I Il III) ,

Waste water economic concern

questionable questionable questionable (nitrite- fnitrit- (nitrite- containing) containing) containing) questionable questionable non-thinking (aerosol (aerosol at education) education) Einhaltg. the standards

harmless harmless harmless

Occupational hygiene concern

harmless harmless harmless

corrosion protection 3 CSI 2 .1 1 1 · Corrosion protection in contact corrosion 5 4 4 1 1 . CSI Lubricant behavior VKA value . >. friction 60/70 0,10 60/70, 0.08 40/50 0.30 90/120 0.02 90/120 0.01 80/90 0.05 Cooling effect Specific heat Cp Heat transfer coefficient K 0.59 0.48 0.51 0.41 -0.89 0.62 , 0.55 0.63 0.51 0.69 0.95 0.75

Rating: 1 = very good; 2 = good; 3 = insufficient commercial product 1 Ferrosol VEB Pölychemie Veiten commercial product 2 KC 20 VEB hardened oil Magdeburg commercial product 3 Frostex VEB hardened oil Magdeburg

Claims (3)

-1- 238 965 5 Invention claims: T. cooling and cooling lubricant with anti-corrosion properties based on OH-containing organic substances and water, characterized in that 5% to 15% butynediol is added as an inhibitor. 2. Cooling and cooling lubricant according to item 1, characterized in that it contains 5% to 15% butynediol 5% to 91% glycols or polyglycols and 4% to 50% alkaline substances, such as alkanolamines, borates, benzoates or phosphates. , contains. , ' 3. Cooling and cooling lubricant according to item 1 and 2, characterized in that / 95% water is added.