CS240719B1 - A mixture of paints, sprays and pastes - Google Patents

Abstract

The purpose of the solution is a mixture to create paints, sprays and pastes used in the foundry to carry out the surface protection of foundry cores and molds. The essence is that the mixture is composed of 2 to 85 wt. of fine cyclone dust from electrographite, further from 10 to 93 wt. diluents, e.g. alcohol, further from 5 to 80 wt. binders such as bakelite putty or molasses. Furthermore, up to 80 wt. % fillers such as amorphous graphite or talc and up to 5 wt. wetting agents such as pekorol.

Description

The present invention relates to a coating, spraying and paste composition used in foundry to provide surface protection for foundry cores and molds.

In foundries for the formation of coatings, sprays and pastes, a mixture consisting mainly of alcohol, amorphous graphite, crystalline graphite and a 30% solution of bakelite sealant in alcohol, for molasses, amorphous graphite, graphite is used to provide surface protection for foundry cores and molds. crystalline and pecorol, quartz flour paste, amorphous graphite, bakelite putty and alcohol.

Amorphous graphite often contains an increased proportion of particles above 0.08 mm up to 35% by weight. and has a high ash content of up to 40% by weight. These circumstances cause the graphite to settle rapidly in the coating or spray, and the high ash content reduces the protective effect of the coating, the spray and the trap against metal penetration and caking on the surfaces of the cores and molds.

Another disadvantage of the present state is that in the case of crystalline graphite the manufacturer is not able to contractually provide the required quality and quantity. Assured quality of crystalline graphite contains up to 20% by weight. ash and its price is high. Crystalline graphite with an ash content of up to 30% by weight is often supplied. ash.

The aforementioned drawbacks are overcome by the coating, spraying, surface protection paste of foundry cores and molds according to the invention.

The invention is characterized in that the mixture is comprised of 2 to 85% by weight. % of cyclic dust from electrographite, further from 10 to 93 wt. % of diluents, e.g. alcohol, from 5 to 80 wt. binders such as bakelite sealant or molasses. Furthermore, it is possible to admix up to 80% by weight. % of fillers such as amorphous graphite or talc and up to 5 wt. wetting agents, e.g.

The advantages of the paint, spray and paste composition are that the fine cyclone dust contains a maximum of 2% by weight. ash and is therefore a very pure raw material. The dispersion of the fine cyclone dust is higher than the amorphous and crystalline graphite (the proportion of particles above 0.1 mm is up to 8% by weight). The cost of fine cyclone dust is lower than that of crystalline graphite.

Coatings and sprays with fine cyclone dust have less sedimentation and have an increased protective effect against caking and penetration. With this in mind, the use of coatings, sprays and pastes containing cyclone dust can result in improved surface quality of castings, reducing more work to clean them, even if the overall proportion of graphite and fine cyclone dust from electrographite is less than amorphous and crystalline graphite in the original coatings, sprays and pastes.

By using cyclone dust from electrographite, savings in its transport and handling can also be achieved compared to the same cost of the original raw materials.

Below is a quantitative composition of the mixture for specific examples:

EXAMPLE 11 a d, 1

The composition of the coating composition contains 30 wt. alcohol, 0 wt%; % amorphous graphite, 60 wt. % fine cyclone of electrographite and 10 wt. 30% solution of Bakelite sealant in alcohol.

Example 2

The composition of the coating composition contains 70 wt. % alcohol, 5 wt. % amorphous graphite, 20 wt. % fine cyclone electrographite dust and 5 wt. 30% solution of Bakelite sealant in alcohol.

Example 3

The composition of the composition for spraying contains 08 wt. molasses, 30 wt. % fine cyclone electrographite dust and 2 wt. pekorolu.

Example 4

The composition of the spray composition contains 70 wt. molasses, 25 wt. % amorphous graphite, 2 wt. % fine cyclone dust from electrographite and 3 wt. pekorolu.

Example 1 a d 5

The paste composition contains 10 wt. alcohol, 85 wt. % fine cyclone of electrographite and 5 wt. 30% solution of Bakelite sealant in alcohol.

Example 1 a d 6

The composition of the mixture 1 to form a paste contains 25 wt. 10% wt. % amorphous graphite, 50 wt. % fine cyclone of electrographite, 10 wt. talc and 5 wt. a 30% solution of Bakelite sealant in alcohol.

Claims (1)

SUBJECT A composition for the formation of coatings, sprayings and pastes for surface protection of foundry cores and molds based on graphite, diluents, binders, fillers and wetting agents, characterized in that the content of the invention is 2 to 85% by weight. % fine cyclone of electrographite, 10 to 93 wt. % diluents, 5 to 80 wt. binders, up to 80 wt. fillers and up to 5 wt. wetting agents.