SU926840A1 - Antisticking ink for molds and cores and method for preparing the same - Google Patents

Description

It contains polymethylphenylsiloxane resin, acetone and acetic acid of 98% concentration, with the following ratio of ingredients, weight. %: Polyvinyl butyral 0.9-1.4 Polymethylphenylsiloxane resin 1.8–2.5 Organic solvent15–20 Acetone 7.0–15.0 Acetic acid 98% concentration 0.3–0.6 Refractory filler Others The composition uses polymethylphenyl-15 siloxane resin grade K-9, as the organic solvent - solvent 646, as a refractory filler - zircon concentrate of the brand KTsP (glide). The paint preparation method is characterized in that dry mixing of the refractory filler with powdered polyvinyl butyral and polymethylphenylsiloxane resin with nasal 25 25 10 20 is introduced into a homogeneous mixture together with acetone with an organic solvent, and after mixing them with the mixture into the last injection acetic acid. acid. The nonstick paint is made by mixing dry constituents, i.e., a refractory nanofiller, polyvinyl butyral (PVB) and a polymethylphenylsiloxane resin. At the same time, a conglomerate of polymer particles K-9 and PVB is enveloped with particles of a fire-retardant nanofiller, i.e. the process of dry cladding proceeds. A combination solvent is then prepared (acetone + solvent 646 in the indicated ratio). The dry powder mixture is introduced into the combined solvent while simultaneously mixing the medium in a paddle mixer at 30-40 rpm for 30-40 minutes until a homogeneous suspension is reached. Acetic acid is introduced in a predetermined amount into the prepared suspension. In tab. 1 shows the formulation of nonstick paint, in table. 2 - paint properties. Table 1

Before testing, the density of paints of all compositions was adjusted to 1.8-1.95 g / cm 3.

table 2

Recipe number

The heat resistance of paints was determined by the method of thermal shock, for which thermal samples were installed in a muffle tube at 5 mip at a temperature of 900 ° C. Prior to installation into the furnace, the samples were suspended in air for about 1 hour. After removing from the bed, the presence of cracks, delaminations, inconsistency of the coating and the degree of penetration was determined visually.

The results of the tests in the table. 3

Table 3

Claims (3)

Claim 1. Non-stick paint for foundry molds and cores containing a refractory filler, polyvinyl butyral, an organic solvent of polyvinyl butyral, characterized in that, in order to increase the heat resistance and sedimentation stability of the paint, it additionally contains polymethylphenylsiloxane resin, acetone and acetic acid of 98% concentration in the following ratio of ingredients, weight. %: Polyvinyl butyral 0.9–1.4 Polymethylphenylsiloxane resin 1.8-2.5 Organic solvent 15-20 Acetone 7.0-15.0 Acetic acid 0.3-0.6 Refractory filler 2. Paint by π. 1, characterized in that as a refractory filler it contains zircon concentrate. 3. The method of preparation of non-stick paint according to π. 1, comprising diluting with an organic solvent polyvinyl butyral and a resin with refractory filler, characterized in that, in order to improve the distribution of the binder and stabilizer over the surface of the grains 20 of the refractory filler, as well as to bring the paint into a thixotropic state, the refractory filler is mixed in dry form with powder polyvinyl butyral and polymethyl25 phenylsiloxane resin, followed by the introduction into a homogeneous mixture together of acetone with an organic solvent and after their mixing with the mixture, acetic acid is introduced into the latter.