SU799892A1 - Pickup preventing coating for casting cores - Google Patents

Description

The invention relates to the field of foundry, in particular X compositions of nonstick coatings for steel, cast iron and non-ferrous castings. A nonstick coating containing a refractory filler, bentonite, carbohydrate-protein hydrolyzate and water 1 is known. The disadvantage of the coating is its susceptibility to microbiological decomposition during storage, as a result of which the technological properties of the coating & requiring long-term storage under various conditions. The closest in technical essence and the achieved result to the proposed is a centrally produced coating, including powdered quartz, amorphous graphite, iron oxide, bentonite, starch malite, water, and antisept admixture (formalin). Formalin is injected to prevent microbial decomposition of the coating during storage. However, the effect of formalin is not enough, and the properties of the coating deteriorate over time. In addition, formalin irritates the human body and has a general effect. In suspension containing formalin, abundant microbial growth is observed both on the surface and in depth. Microscopic examination revealed lower fungi of the genera Penicillium and Misog, as well as iron-reducing bacteria, forming in the depth of the cover bluish-green spots and streaks of reduced iron. This slurry has a pungent odor of biodegradable products. The purpose of the invention is to ensure the stability of the properties of the non-stick during storage and to improve the sanitary and hygienic working conditions. The goal is achieved by the fact that as an antiseptic additive, the coating contains a sulfate (CuSQj) with the following ratio of ingredients, weight. %: Refractory filler 35-70 Organic binder of vegetable origin 1-10

Bentonite1-4

Sulfate copper 0.05-2.0 Water Else

Graphite, zircon, powdered quartz, iron oxide, talc, etc., as well as compositions of these metals can be used as a fire filler.

The organic sulphite-alcohol concentrate 6ar55Y, starch, carbohydrate-protein hydrolyzate, etc., as well as their mixtures can serve as organic binding.

When preparing the coating, a liquid composition is first prepared. At the same time in the paint mixer

Starchy and copper sulfate sulfate are diluted in water for 15 minutes,).

The powder mixture is prepared in dry runners, where refractory filler and bentonite are introduced. The density of the resulting suspension is 1.38 g / cm

The coating is stored for three months at room temperature in a plastic wrap.

No changes were found in the suspension containing copper sulfate.

The properties of the proposed coating and formulations (1-6) are given in Table. 1 and 2.

Table

Organoleptic: In the manufacture After 10 days

Mold all over

30 days surface

90 days

Smell of rot

ness, g / mm:

1800

1800 manufacturing 1600

1300 out of 10 days 1500

1000 30 days 1300

600 90 days

Without signs of development of microorganisms. Without signs of development. Sharp smell of rotting microorganisms,

Claims (2)

Abundant gas formation. No signs of microorganism development. Mold on the signs of development. Mold on specific areas of microorganisms of the entire surface. Introduction 0.05-2.0% CuS04 protects the nonstick coating from microbiological decomposition, which drastically reduces its quality, which is previously reflected in strength nonstick coating. The introduction of a smaller amount of antiseptic additive does not ensure the safety of the coating (its strength is significantly reduced compared to the original one), and its organoleptic properties deteriorate one month after its manufacture. It is economically inexpedient to add it in a larger quantity, since with a higher consumption of reagent, the technological properties do not improve. The advantage of the proposed anti-stick coating is the possibility of its centralized preparation with delivery to the consumer without loss associated with the deterioration of quality during transportation and storage. As a result, loss of coating due to deterioration is reduced, and sanitary and hygienic working conditions are improved, due to the exclusion of volatile toxicant formula from the coating composition. Invention Non-stick coating for cores, including a refractory filler, organic binder of plant origin, bentonite, water and antiseptic additive, characterized in that, in order to ensure the stability of the properties of the coating during storage and to improve the sanitary and hygienic working conditions, stve antiseptic additives it osderzhit sledukvdem copper sulphate at a ratio of ingredients, wt. %; Refractory filler 35-70 Organic binder of vegetable origin 1-10 Bentonite1-4 Sulfuric acid copper 0.05-2.0 Water Other sources of information. Taken into account during the examination 1. USSR Revolutionary Inspection No. 584962, cl. B 22 C 3/00, 1977. 2. Molding materials, Catalog, M ,, 1978, p. 44.