DD208378A1 - WASH FLUIDS FOR CLEANING USING ULTRASOUND - Google Patents

Abstract

The invention relates to non-aqueous washing liquids which can be used to clean microfinished metallic surfaces of, for example, roller bearings using ultrasound. Aim of the invention is the creation of Waschfluessigk., Which in cleaning u. Use of ultrasound with a power density of more than 0.5Wcmhoch-2 a good cleaning effect, no Korrosiionserscheing. and an economically acceptable Standz. cause the cleaning bath. The inventive Waschfluessigk. consist of a combination. from 96.0 to 99.9 mass% of a hydrocarbon g. in the boiling range v. 150 to 300 degrees C, 0.5 to 1.5 mass% of an alkylphenyl phosphite and the like. 0.5 to 2.0% by mass of one sterically hindered. Phenols and / or. 0.1 to 0.8 mass% of a d. Umsetzg. of phenols m. Formalin or paraformaldeh. u. sekundn. Get amines. Reaktionsprod ..

Description

Washing liquids for cleaning using ultrasound

Field of application of the invention

The invention relates to non-aqueous washing liquids which can be used to affix micro-machined metallic surfaces of, for example, rolling bearings using ultrasound. "

Characteristic of the known technical solutions

It is known to use low-boiling hydrocarbon mixtures, chlorinated hydrocarbons or aqueous media as washing liquids for the purpose of complete cleaning of very fine-grained metallic surfaces. In this case, the cleaning effect by increasing the temperature of the S ¹ IUssigkeit, by strong relative movement of the liquid to the y metal surface and by application of ultrasound can be increased "

The use of aqueous washing liquids is practically hardly possible, in particular under the production conditions of flow production in the production of rolling bearings, since batchwise cleaning can not be carried out without further ado. In addition, aqueous media do not have the necessary to ensure trouble-free operation of the immediately following measurement and assembly operations.

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properties and "do not bring about the highest possible cleanliness of the rolling bearing parts to be assembled, which is an absolute prerequisite for achieving a low noise level in the fully assembled rolling bearing.

Non-aqueous washing liquids such as. low-boiling hydrocarbon mixtures and chlorinated hydrocarbons, especially in conjunction with other measures show a significantly better Eeinigungswirkung. For example, HS-AS 26 20 243 u. a. the use of gasoline or petroleum fractions and trichlorethylene for the cleaning of rolling bearing parts, wherein an ultrasonic treatment is carried out to increase the heating effect. However, the use of such washing liquids is associated with the following disadvantages. The chlorohydrocarbons considered are toxic and, depending on the degree of their pollution and Einsätzdauer to elimination of hydrochloric acid, so there is already in the presence of humidity constantly the risk of hydrochloric acid corrosion * When Sins atz of hydrocarbon mixtures as washing liquid with simultaneous application of ultrasound the usable power density of the ultrasound too low. As power density increases further

introduced into the zone of energy coupling destruction of the hydrocarbon molecules to low molecular weight polar decomposition products are generated in the result of that function y with respect to metallic surfaces corrosive. The

30 ^: Schallwechseleldruckj crucial for the heating effect in which cavitation occurs at the metal surface to be cleaned can therefore not be increased to the required extent.

35 Object of the invention

The aim of the invention is to provide washing liquids for the

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ultrasonic cleaning ", which in the cleaning of very finely worked metallic surfaces of, for example, roller bearings using ultrasound with a power density of more than 0.5 W cm cause a good Eeinigungseffeiet, no corrosion phenomena and an economically acceptable life of the cleaning bath.

Explanation of the essence of the invention

The object of the invention is to provide stabilized washing and cleaning liquids by combination of low-boiling hydrocarbon mixtures with suitable additives which decisively delay the degradation of the hydrocarbon molecules initiated by ultrasound of high power density to form corrosive decomposition products without reducing the cleaning effect of the hydrocarbon mixtures.

Surprisingly, it has been found that for the cleaning of microfinished metal surfaces, suitable washing liquids which are prepared by ultrasound with a power

- 2 density of more than 0.5 w cm initiated formation of low molecular weight corrosive degradation products of coal- hydrogens crucial retard and not reduce the cleaning effect can be obtained by a combination of

96.0 to 99j9% by mass of a hydrocarbon mixture in the boiling range of 150 to 300 C, 0.5 to 1.5% by mass of an alkylphenyiphosphite, preferably trinonylphenyl phosphite and / or 0.5 to 2.0% by mass of a sterically hindered. Phenol, preferably 2.5- ^D i- "ksrtiär-butyl-4-methyl-phenol (3-BPC) and / or

0.1 to 0.8% by mass of a reaction product obtained by reacting phenols with formalin or formaldehyde and secondary amines and consisting of two or three

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aiainomethylierten phenols or their mixtures "consists.

In making the compositions of the present invention the additives are transferred individually in any order at a temperature of 50 "to 70 ⁰ C with continuous HiIhren mixture eye the hydrocarbon,

embodiments

The invention will be explained in more detail below on some embodiments.

example 1

99 Hasse-% of a mixture of η-paraffins of chain length C ^ to CLg in the boiling range of 225 to 300 ⁰ C and 1% by mass of trinonylphenyl phosphite are stirred at a temperature of 60 ⁰ G mit.eina.nder other and as washing liquid it to Cleaning of rolling bearings using ultrasound with a power density of 1.3 w, '

Example 2

98% by mass of a mineral oil distillate of paraffin-based Srd: oil in the boiling range of 19Ο to 280 ⁰ G and 2% by mass of 4,4'-mathylene-bis (2 ^ δ-di-tertiary-butyl-phenol) ^y are in a Temperature of '65 ⁰ G mixed with stirring and used as a washing liquid for cleaning metallic Uormteilen using ultrasound with a power density of 1, 1 W cm * ~,

Example 3.

99s7% by mass of a mixture of a paraffins of chain length C ,, o to C ^ g in the boiling range of 225 to 300 ^U C and

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0.3% by mass of a. Reaction of phenol with paxaformaldehyde and dimethylamine obtained reaction product, which consists mainly of iris (dimethylaminomethyl) phenol, Oei a temperature of 55 C are stirred together and as a washing liquid for cleaning Sinspritzpumpenelementen using ultrasound

-2 used with a power density of 1.5 W cm,

Example 4. ·

99% by mass of a mixture of η-paraffins of the chain length G ^ o "to σ ,." in the boiling range of 225 to 300 ⁰ G and 1% by mass of 2,5-di-tert-butyl-4-methyl-phenol (DBPG) are mixed at a temperature of 70 ⁰ G under stirring with- ^ 5 to each other and used as washing liquid for the cleaning of metallic ITormteilen using ultrasound at a power density of 1.2 W cm.

Example 5 20

99} 4 · mass% of a mixture of η paraffins of chain length C ^ to Gy.Q in the boiling range of 225 to ^ QQ ⁰ G ,. 0.5% by mass of 2 _< 5-di-tertiary-but-7-methyl-4-methylol (LBPG) and 0.1% by mass of a reaction product obtained by reacting phenol with paraformaldehyde and dimethylamine, weighing from tris- ( Dimethylaminomethyl) phenol are stirred together at a Temperatur'von 60 ⁰ G together and as a washing liquid for cleaning ^y rolling bearing parts using ultrasound with a

30 power density of 1.4-W cm "^ used.

Table 1 gives the results of cleaning tests with washing liquids corresponding to the solution according to the invention in the composition according to example 1 to 3 as well as a product of the prior art using ultrasound of different power density.

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From the investigation results, it can be seen that in the unalloyed product of the prior art

-2 an ultrasonic power density of 0.3 W cm no appreciable formation of corrosive decomposition products takes place, but the Eeinigungseffekt is insufficient. If the ultrasound range is further increased

-2

Density to more than 0.5 W cm and increasing improvement _{e of} the cleaning effect decreases the life of the cleaning bath, due to the occurrence of corrosive water-soluble acidic compounds, to a considerable extent, so that the use of such products is not economically justifiable.

On the other hand, the washing liquids according to the invention show

-2 at ultrasonic power densities of well over 0.5 ^ cm 'a good Heinigungswirkung and at a comparison with the unalloyed product of the prior art 4 ~ to 5-faeh higher life of the digester still no formation of corrosive acid degradation products,

Table 1

washing liquid

Power density sounding time detection on cleaning

of ultrasound s lifetime of the water-soluble effect

-2

(W cm) Cleaning bath acids

According to the solution according to the invention in the composition of Example 1 Example 2 Example 3

1.3 880 negative Well 1.1 800 negative Well 1.5 1000 negative   Well

According to the prior art brand ni> roduct based on η-Paraffineη the chain length G ^ o to

600 200

negative positive

insufficiently good

Claims (2)

- 8 claim for invention 1. Washing liquids for cleaning using ultrasound, "consisting of low-boiling hydrocarbon mixtures and stabilizing organic additives, characterized - characterized in that they," based on the finished product, from 96.0 to 99.9 mass of a hydrocarbon mixture in the boiling range of 150 to 300 ⁰ G, 0.5 to 1.5% by weight of an alkylphenyl phosphite and / or 0.5 to 2.0% by weight of a hindered phenol and / or 0.1 to 0.8 mass %. a reaction product obtained by reaction of phenols with! formalin or paraformaldehyde and secondary amines, which is composed of di- or tri-amino-substituted phenols or mixtures thereof. 2. washing liquids according to item 1, characterized in that as alkylphenol phosphite trinonylphenyl phosphite and is used as sterically hindered phenol 2.5-di-tertiary-butyi-ethyl-phenol (OBPG).