SU1212992A1 - Method of preparing glass mould for operation and heat-resistant lubricant for glass moulds - Google Patents

Abstract

1. The method of preparing the glass mold for work, including preheating the mold to 120-, sequential spraying of the soil and water suspension of heat-resistant lubricant on its working surface, drying, heat treatment at 350-400 С and cooling, characterized in that The quality of the glassware is ensured by providing an even resistant layer of lubricating coating on the surface of the mold. After drying, the working surface of the mold is polished to a roughness of K, 0.32-1.25, and cooled to 100-150 ° C, after which the mold is impregnated mi eralnym oil. 2. Heat-resistant lubricant for glass forms, including graphite of a lamellar structure, polymineral clay, sodium nitrogen-toxic, high-temperature binder and water, in order to improve the quality of glassware by providing a uniform resistant layer of lubricating coating on the surface of the form, it contains as a high-temperature binder sodium silicate and additionally activated carbon in the following ratio, wt.%: § (L Graphite lamellar structure Clay polymine- shna Sodium hydrazoic acidic sodium silicate Activated Carbon Water 1.6-1.8 0.7-0.9 2.4-2.6 0.7-0.9 0.1-0.25 rest

Description

The invention relates to glass industry and can be applied in the manufacture of glass products by a mechanized method.

The purpose of the invention is to improve the quality of glassware by providing a uniform, resistant layer of lubricating coating on the surface of the mold. .

In the heat-resistant lubricant, the components perform the following functions: graphite of a lamellar structure — a high-temperature lubricant; polymineral clay - filler and high-temperature binder; sodium nitrite; - anti-corrosion agent; sodium silicate - high temperature binder; activated carbon adsorbent, water - carrier of solid particles on the surface of the mold (after applying a heat-resistant film: water is evaporated on the surface).

The introduction of sodium silicate into the lubricant makes it possible to improve the adhesion and cohesive properties of the lubricating coating at operating high temperatures, as a result of which its durability is increased.

The introduction of activated carbon into the lubricant will improve the adsorption properties of the lubricating coating, thereby improving its soaking with oil and reducing the coefficient of friction of the working surface of the mold during operation, as a result of which the quality of the product is improved.

The use of activated carbon and sodium silicate together with the rest of the lubricant components allows an increase in the yield ratio of the product by reducing the time for the glass mold to reach the operating mode (15-20 minutes instead of 3-5 h) and improving the working surface of the mold with lubricant applied

With a decrease in the amount of graphite of less than 1.6 wt.%, The lubricating properties of the composition deteriorate, and with an increase of more than 1.8 wt.%, An excess of gralite is observed, which leads to a deterioration of the coating cohesion.

With a decrease in the amount of polymineral clay of less than 0.7 wt.%, Cracking of the coating is observed at high temperatures, and with an increase of more than 0.9 wt.%, The lubricating properties of the coating are judged,

922

When reducing the amount of sodium nitrite at less than 0.1 wt.%, Corrosion of the working surface of the glass-forming tool is observed, and an increase of more than 0.25 wt.% Does not make sense, since sodium nitrite in the range of 0.1-0.25% is sufficient to protect working surface of glass molds from

corrosion.

When sodium silicate decreases less than 2.4 wt.%, The adhesion of the coating to the working surface of the glass mold and its cohesion deteriorates, and with an increase of more than 2.6 wt.%, The lubricating properties of the coating deteriorate.

When the amount of activated carbon is reduced to less than 0.7 wt.%, The adsorption properties of the coating deteriorate, and an increase of more than 0.9 wt.% Leads to a deterioration in the cohesion of the coating.

Due to the polishing of the working surface of the mold to roughness, 32-1.25, the quality of the outer surface of the glassware is improved, the yield of suitable products is increased, and the presence of traces of lubricant on the outer surface of the product is eliminated. Polishing the surface of the lubricating coating to a roughness is lower, 32 is not required, since even at this value the surface of the glassware is of sufficiently high quality. Polishing the surface of a lubricating coating to a roughness of Bbmie R 1.25 does not give enough

smooth and high-quality surface

glassware.

If the temperature during the impregnation with mineral oil is higher than 150 ° C, then either intensive evaporation of the oil or its ignition occurs. Cooling the mold below 100 ° C results in absorption of moisture from the air by the adsorbent, which results in a decrease in the strength of the coating.

Impregnation of the working surface of the mold with applied lubricant after cooling; C to Mineral Oil provides a significant reduction in the coefficient of friction and accelerates the output of glass molds to the operating mode, as a result of which the quality of glass products is improved and the yield rate of good products increases.

Heat-resistant lubricant is applied to the work surface of glass molds according to the following technology.

The prepared 2-2.5% aqueous solution of one- and two-substituted ammonium phosphate used as the soil is heated to 80-90 ° C and applied by air spraying using a spray gun to the working surface of the glass mold, preheated up to 150 ° C and cleaned of various contaminants and dross. The applied thin layer of one or two substituted ammonium phosphate is dried for 3-5 minutes, after which an aqueous suspension of the specified heat resistant lubricant heated to 80-90 s is applied by air spraying and dried.

The optimum ratio of the components is determined by lubrication testing. The results are shown in table 1.

After drying, the coating is polished to a roughness of 32-1.25, heat treated at 350-400 ° C for 8-12 hours, the mold is cooled to 100-150 ° C and the coating is impregnated with mineral oil. Impregnation of a heat-resistant lubricating coating with mineral oil is carried out with a brush.

During the operation of the lubricant on the surface of glass molds, when it is periodically affected by compressive

Sodium Nis-acid 0.05

Sodium silicate

Activated carbon

Water

ten

ts

2129924

; load, coating temperature to 550 C.

During operation, the molds are automatically lubricated using a spray ejector synchronized with the operating cycle of the glass forming automaton.

Table 2 shows the parameters for the specific use of the method for preparing the mold for operation in various modes.

Under modes with parameters of composition 1, the surface of the produced glass products is not smooth enough due to the considerable roughness of the working surface of the form. At low temperatures of preheating, heat treatment, and subsequent cooling of the mold, the coating is friable, the adhesion is unsatisfactory. Under conditions with composition parameters 5, due to the high heating temperatures, a shedding of a lubricating coating is observed, i.e. cohesion and 25 adhesion unsatisfactory. With modes with composition parameters 2 and 4, good results were obtained, and with modes with composition parameters 3, the best results were obtained.

The use of the proposed method of preparing the glass mold for operation and lubrication allows reducing gas pollution in the workplaces of service personnel below sanitary and hygienic standards (to increase the yield of products and improve their quality.

Table 120

thirty

35

cracking of the lubricating coating is observed. Corrosion of the substrate is observed. The coating is not well impregnated with mineral oil.

Continuation of table 1

Editor I. Derbak

Compiled by V. Yudin Tehred A.Ach

Order 720/33 Circulation 458 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

table 2

Proofreader E.Roshko

Claims (2)

METHOD FOR PREPARING A GLASS FORM FOR WORK AND HEAT RESISTANT GREASE FOR GLASS FORMS. (57) 1. A method of preparing a glass mold for work, including pre-heating the mold to 120 150 ° C, sequentially spraying the soil and an aqueous suspension of heat-resistant lubricant on its working surface, drying, heat treatment at 350-400 ° C and cooling, characterized in that , in order to improve the quality of glass products by ensuring an even, stable layer of lubricating coating on the mold surface, after drying, the working surface of the mold is polished to a roughness of R = 0.32-1.25, and cooling is carried out to 100-150 ° C, after which the mold is impregnated mineral oil. 2. Heat-resistant lubricant for glass molds, including plate-type graphite, polymineral clay, sodium nitrite, a high-temperature binder and water, characterized in that, in order to improve the quality of glass products by ensuring an even, stable layer of lubricating coating on the mold surface, 'it contains as a high-temperature binder, sodium silicate and additionally coal in the following constituents, wt.%: Lamellar graphite Clay polymineral Sodium Nitrate Sodium Silicate • Activated Carbon Water activated ratio com · 1.6-1.8 0.7-0.9 0.1-0.25 2.4-2.6 0.7-0.9 Rest