AU450220B2 - Rust preventative compositions - Google Patents

Description

This inveation relates to rust preventive compositions.

Although for many applications, currently used rust preventive compositions are quite adequate it has been

found. that. one composition, containing sodium suiphonates

and lanolin, is not satisfactory for the protection of

stressinfg tendonis for Use in the concrete shield of atomic

power stations. It has been found that stray electrical currents. and, the presence of water in the ducts caused the

rust preventive compositioni to emulsify due to the breikkdown

of the sodium suiphonatei and lanolin. In the presence of the emulsion electrical currents cause pitting of the wire making up the tendon.

We hire now discovered a rust previentivie co*6osition

iihidh does not have the disadvrantages of the above-Inenkioned dompoition. Adcording tb this invention a rust-preve~ntive dooioitjion compisdes A mxture of a wax, ei.g. petrolgtu,z

at bmetal naphthinatei and an esier formed from a polyal aAnd An

naturai fatty body. here *y Also be presenta diluent -quch A4 a lubicating oil or white spiit.

The 4ax utied iii the cgmpoiition can be ay petrolei wax from an oily airiffh in ibtoA hard de-oiled patrolatum, bi a hALiri hi such as cii&U i f air ees Oat. Ddbcould 69e is hard Fcf4*ritillih6 Vifti bUt ifi

general 06trolgt'um is Orfitioffa.

The diluent can be a lubricating 6il sodh As ak hydrocarbon oil ofr a synthetic 6ii, e.g. A diester derived from adipic or sebacic acid with a motiohydric alcohol such ai 2-ethyl hexanol. The oil is however preferably a mineral oil.-

2. Q2

2285 3po

The metal naphthenate can be a naphthenate of

any metal, e.g. sodium, calcium, barium, zinc, aluminium,

iron, or cobalt. It is however preferably a naphthenate

of a metal of Group IV of the Periodic System, e.g. of

tin or lead.

The ester is derived from a polyol and a natural

.fatty body. Thus it can be derived from sorbitan, mannitan,

pentaerythritol, or trimethylol propane and other polyhydric

alcohols preferably having no more than 8 carbon atoms per

molecule. Suitable natural fatty bodies include animal fatty

bodies such as lanolin, wool grease, tallow or castor oil.

The preferred ester is the pentaerythritol ester of lanolin.

Preferred quantities (by weight) for the components

of the rust-preventive composition are as follows: 67 Wax

Oil 4-15%

Naphthenate 4-10%

Ester 2-8Z

Other. components which may be included in the

rust preventive composition of this invention are antioxidants

such as phenyl- Of-naphthylamine.

Example 1

A rust preventive composition was prepared by mixing

together the following ingredients after heating the petrolatum

to 90 C. The lead naphthenate was actually added as a 50/50 solution

in mineral oil, but the quoted percentage refers only to the lead

naphthenate itself.

4 5 0 220

Wt.%

Mineral oil, 42 cS at 210°F 9.6

Mineral oil, 7.75 cS at 210°F (solvent for lead naphthenate)

Petrolatum 7.7.4

Lead naphthenate (301 Pb)

Pentaerythritol ester of lanolin

This composition was tested and compared with a

prior art composition by smearing wires with the

rust preventive composition in each case and applying a

potential of 10 volts for 100 hours when the wires were

submerged in water. The prior art composition was found

to have emulsified and this led to pitting of the wires

but with the composition of this invention no emulsification

and no pitting took place.

Example 2

A rust preventive composition was prepared by mixing

together the following ingredients after heating the petrolatum

to

Wt.ZX

Mineral oil, 7.8 cS at 210°F

Petrolatum 87,0

Lead naphthenate (302 Pb)

Pentaerythrit.ol eater of lanolin

This composition was tested by smearing wires with the

composition and applying a potential of 10 volts for 1000 hours

when the wires were submerged in water. At the end of this time

no erulsification or pitting had occurred.

450.2

Claims (4)

22.853. 7o The Claims Defining The Invention Are As Follows.

1. A rust-preventive composition comprising a mixture of a

wax, a metal naphthenate, and an ester derived from a polyol and

a natural fatty body.

2. A composition according to claim 1 which also contains a

diluent.

3. A composition according to claim 2 wherein the diluent

is a mineral oil.

4. A composition according to any one of the preceding claims

wherein the wax is petrolatum.

A composition according to any one of the preceding claims

wherein the metal naphthenate is a naphthenate of a metal of Group IV

of the periodic System.

6. A composition according to claim 5 wherein the metal

naphthenate is lead naphthenate.

7. A composition according to any one of the preceding claims

wherein the polyol from which the eater is derived is a polyhydric

alcohol having no more than 8 carbon atoms per molecule.

8. A composition according to claim 7 wherein the polyol

is pentaerythritol.

9. A composition according to any one of the preceding

claims wherein the natural fatty body from which the ester is

derived is lanolin.

A composition according to any one of the preceding

claims wherein the amount of wax is 60-90Z by weight, of oil 4-151

by weight, of naphthenate 4-10% by weight, and of ester 2-8% by

weight.

11. A composition according to any one of the preceding

45 0,220

22.8523170

claims which also contains an antioxidant. 12. A composition according to claim 1 substantially as

hereinbefore described4W...- ,e Example 1. 13. A composition according to claim 1 substantially as

hereinbefore describedjyith rof erons to Example 2.

Date thIma* t' 1v 0.

ESSO REEARCH AND ENGINEERING COMPANY-

EDW! WATERS SONS PATENT ATTORNEYS MELBOURNF

4 5 02 24(

22.85 370

4 5 0.220