RU1810387C - Technical detergent for metal surface defatting - Google Patents

Abstract

The inventive technical detergent Elrna for degreasing a metal surface contains polyethylene glycol ethers of synthetic primary alcohols fraction with 10 mol of ethylene oxide 4-9%, polyethylene glycol ethers of synthetic monoethanolamides of synthetic fatty acid fraction Csu-Cie with 5-6 mol of ethylene oxide 9-14% polyoxyethylated monoalkylphenols based on examples of propylene with 10 or 12 mol of ethylene oxide 23-30%, polyethylene glycol - 35% resin m. 1400-1600. Hydrogen up to 100%. 3 tab.

Description

ate

with

The invention relates to technical detergents intended for use in degreasing and etching processes on the surface of steel and non-ferrous metal products, at a temperature of the washing solution of 30-40 ° C. The preferred area of use is the preparation of metal surfaces before electroplating, the combined etching and degreasing process aluminum and its alloys.

The purpose of the invention is to increase the degreasing ability at a temperature of a washing solution of 30-40 ° C, increase the stability of the foam and improve working conditions.

The goal is achieved in that a well-known detergent containing polyethylene glycol ethers of synthetic primary alcohols fraction, with 10 mol of ethylene oxide, polyethylene glycol and water, additionally.

it contains polyethylene glycol esters of monoethanolamides of synthetic fatty acids of the Cio-Cie fraction with 5-6 mol of ethylene oxide, polyoxyethylated monoalkyl phenols based on propylene trimers with 10-12 mol of ethylene oxide, polyethylene glycol-35 with col. m. 1400-1600 in the following ratio of components, wt.%: Polyethylene glycol ethers of synthetic primary alcohols fraction C12-C14 C 10 MOL

ethylene oxides Polyethylene glycol esters of synthetic fatty acids monoethanolamides of the Cio-Cie fraction with 5-6 mol of ethylene Polyoxyethylene monoalkylphenols based on propylene trimers with 10 or 12 mol of ethylene oxide 23-30

4-9

9-14

00

about

with

00

Vj

Polyethylene glycol-35

pitches. M. 1400-16004-8

WaterUp to 100

The components included in the detergent perform certain functions.

Polyethylene glycol ethers of synthetic primary alcohols of organoaluminum synthesis of a fraction with 10 mol of ethylene oxide Sintanol ALM-10 (TU 6-14-19-472-83), in appearance the paste is from white to slightly yellow in color. According to toxic properties, they belong to class III of moderately hazardous compounds. It provides high degreasing ability, is an emulsifier (dispersant), a wetting agent.

Polyethylene glycol esters of monoethanolamides of synthetic fatty acids of a fraction with 5-6 mol of ethylene oxide - Syntamide-5 (TU 6-02-640-83), in appearance the liquid is light yellow in color. According to toxic properties, it belongs to low-hazard products of class IV. It is a wetting agent and emulsifier of mineral oils, as well as a foaming stabilizer.

Polyoxyethylated monoalkylphenols based on propylene trimers with .10 or 12 moles of ethylene oxide — Neonol AF9-. 10 and Neonol AF9-12 (TU 38.103625-87), where 9 is the number of carbon atoms in the alkyl radical, 10 and 12 is the number of moles of ethylene oxide attached to 1 mol of elkylphenol, in appearance oily liquids are light yellow in color. They are classified as toxic to class III hazardous substances. They are effective degreasers at low temperatures, and washed soils are emulsified in the bulk of the solution.

The nonionic surfactants used in the formulation are distinguished by good solubility in electrolytes, and are resistant to hydrolysis and current.

Polyethylene glycol-35 (TU 6-14-826-83) is transparent in appearance and a colorless liquid. No toxicity. It is a wetting agent, dispersant, co-solvent that increases the stability of the commodity form of the product during storage and cooling,

The product is prepared by mixing the components in a mixer at 40-50 ° C. The finished product is a viscous liquid of a light yellow color. In terms of toxicity, it belongs to low-hazard substances of class 4, biodegradable in wastewater, does not require special methods of disposal.

The effectiveness of the claimed TMS was determined in the processes of chemical and electrochemical degreasing of metal plates. In the table. 1 shows the ratio of the components of the investigated compositions, in table. 2 - the results of evaluating the degree of surface cleaning and foam stability,

The degreasing ability was determined gravimetrically from the change in the mass of dirt deposited on the metal plate before and after cleaning and was expressed in wt.%. Soiled plates were immersed in the washing solution for 5 min at 20–50 ° C. 5 Electrochemical degreasing was carried out similarly, at a current density of 2–5 A / dm2.

The composition of the washing solution, g / dm3:

Sodium hydroxide 10-20 0 Trisodium phosphate 20-30

Soda ash 20-30

Suggested technical detergent:

with chemical dehydration 5-5

at electrochemical

degreasing

The stability of the foam was estimated as the ratio of the height of the foam column over a certain time interval to its initial height. An increase in the coefficient (Ku) corresponded to an increase in foam stability.

The essence of the proposed tool is explained in examples 1-5 of the table. 1, the test results are presented in Table 2. Comparative tests of this agent and two formulations of the Elva composition (prototype base sample) were carried out under similar 0 conditions. .

The outcome of the data table. 2 it follows that

proposed technical detergent

characterized by high degreasing

ability and steady foaming at 30-40 ° C.

Elva formulations (Examples 6-7) under the same conditions have lower foam stability and insufficient degreasing ability. 0 Thus, when using the proposed technical detergent is achieved;

- save material and energy resources for heating the anann and maintaining the thermal regime;

- reducing the evaporation of electrolytes and the formation of a foam layer on the mirror of electrochemical baths by 4-10 times reduces the discharge into the air of industrial premises and the atmosphere of alkaline and acidic vapors

and aerosols, which helps to improve the working conditions of staff. The adaptation of energy-saving ones carried out at a number of enterprises, the degreasing process using TMS Elon samples showed that the alkalinity of the solutions, the concentration of surfactants, and the cycle time are not increased in comparison with the adopted cleaning technology at 60-80 ° С.

Claims (1)

SUMMARY OF THE INVENTION A technical detergent for degreasing a metal surface containing polyethylene glycol ethers of synthetic primary alcohols fractions of 10 mol ethylene oxide, polyethylene glycol and water, characterized in that, in order to increase the degreasing ability at a temperature of the washing solution of 30-40 ° C, increasing the stability of the foam and improving working conditions, the tool further comprises polyethylene glycol ethers of monoethanolamides of synthetic fatty acids fraction  with 5-6 moles of ethylene oxide, poly-ethoxylated monoalkylphenols based on propylene trimers with 10 or 12 mol of ethylene oxide and the agent contains 35-polyethylene glycol as polyethylene glycol. m. 1400-1b 00 with the following ratio of components in May.%: Polyethylene glycol synthetic esters primary alcohols fraction Ci2-Ci4 with 10 mol ethylene oxide 4-9 Polyethylene glycol monoethanolamide esters synthetic fatty acids of the Cio-Ci6 fraction with 5-6 moles of ethylene oxide 9-14 Polyoxyethylenated: monoalkylphenols based on propylene trimers with to go 12 mol of ethylene oxide 23-30 Polyethylene glycol-35 with mol. m. 1400-1600 4-8 Water Up to 100. Table 1 The degreasing ability and stability of the foam compositions of the proposed and base TMS Table 2