Method of treating glass forming molds and the like

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT This invention relates to a process for treating glass forming molds utilized in the making of glass containers, as well as other hot glass handling surfaces of related equipment.
The preferred method is to clean the surfaces of such molds and apply directly to the surface a metal organic phosphate, along with a finely-divided lubricious filler, which phosphate is soluble in an anhydrous organic solvent with anhydrous dilutants.
After heating to 200.
degree.
C.
or higher, this material is converted to a solid film lubricant, antiwear refractory agent and protective coating for the mold surface.
The antiwear lubricious component of the solid film lubricant may be a filler of any of several solid refractory lubricants such as boron nitride, graphite, carbon black, etc.
Graphite is a preferred solid lubricant in accordance with this invention.
The size of the solid lubricant particles is not critical but they must be finely-divided, preferably in the 0.
5-50 micron range.
Mixtures of graphites may be used advantageously.
ALUMINUM ORGANIC PHOSPHATE SOLUTIONS The aluminum organic phosphates are prepared by the reaction between an aluminum alkoxide and phosphoric acid in an anhydrous solvent such as methoxy-, ethoxy- or butoxy-ethanol or methanol.
Generally mixtures are prepared which contain aluminum to phosphorus ratios of 1.
0/2.
0 to 3.
5 and higher, although ratios of 1.
0/2.
5-3.
0 are preferred and the final products are normally clear viscous colorless solutions with a solids content of about 30 percent by weight.
The structures of the aluminum organic phosphates are extremely complex but will contain metal-oxygen-phosphorus linkages, hydroxyl groups and alkoxy groups formed by reactions such as the following: ##STR1## The aluminum alkoxide is represented by the formula Al(OR).
sub.
3 where R represents an alkyl group C.
sub.
n H.
sub.
2n+1 or alkoxyethyl group C.
sub.
n H.
sub.
2n+1 OC.
sub.
2 H.
sub.
4, where n is from 1 to 4.
It is convenient to use the alkoxy group, OR, corresponding to the solvent used for the reaction, i