SU831337A1 - Pickup preventing paint for casting moulds and cores - Google Patents

Description

laccia internal stresses and increase elasticity. Tricresyl phosphate and tributyl phosphate are organic compounds, which are esters formed from ortho, meta, or para-cresol and ortho-phosphoric acid. The technical product contains a mixture of all three isomers without color and odor. The use of a plasticizer below the lower limit does not improve the operational and technological properties of paints, and its use above the upper limit is impractical because of the sufficient strength of anti-friction coatings. Tetrabutoxytitanium (TBT or polybutyl) 1 titanate (PBT) is a binder in antiburning crystals with a fast curing cycle. TBT is a transparent viscous liquid from light yellow to light brown color with a molecular weight of 340.4 and a gloss The equine product of the hydrolysis of polybutyl ether and ortho-titanic acid. Its chemical formula is gt} () 43 | t PBT is a clear liquid from light yellow to light brown in color with a molecular weight of 210.13 and is an intermediate product upon receipt of TB Its chemical formula is Гт i (ОС4 Нд) 1 (,. The choice of the lower limit when introducing these binders into the nonstick coatings is due to the insufficient strength of the coatings below this limit, and using it above the upper limit is impractical due to a sharp increase in internal stresses coatings In order to achieve the required sedimentation stability of nonstick coatings with a fast curing cycle, polyisobutylene is used as a stabilizer. The presence of the lower limit of the specified stabilizer is due to insufficient sedimentation stability in the table of roofs. below this limit, and using it above the upper limit is impractical because of the deterioration of the covering ability of coatings due to a sharp increase in viscosity. The solvent used is a mixture of gasoline with white spirit in a 1: 1 ratio. As a refractory filler, you can use titanium dioxide, iron-free zircon, rutile with a titanium dioxide content of at least 80%, etc. The paint is prepared as follows. Polyisobutylene is introduced into the mixture of gasoline with white spirit and stirred until it is completely dissolved. Then TBT or PBT, tricresyl phosphate or tributyl phosphate are introduced into the resulting solution and mixed until a homogeneous mass is obtained. In the resulting solution, thoroughly mixing, enter the refractory filler to the desired density of paint. The proposed paint can be used to cast obtained in any HI | PX casting molds. The compositions and properties of paints are given in table. 1 and 2. The heat resistance of non-stick Paints with a fast curing cycle (ignited) is evaluated by the method of thermal shock when placing the sample with paint in a furnace heated to 1500 ° C. Paint is applied to the sample with a brush and set on fire. Exposure of the sample with paint in the oven - 1-2 minutes. The paint is considered to be heat resistant if at the moment of thermal shock of being in the furnace and immediately after being removed, no cracks, delaminations and crumbling of the paint are observed on the painted surface. As can be seen from the table. Composition 2 and 3 have optimal properties. The implementation of the invention allows to reduce the number of defective castings and to reduce the volume of cutting and welding defects.

Tetrabutoxytitanium

Pributyltitanate

Polyisobutylene

Tricresyl phosphate

2.2

2.0

2.2

0.5

0.6

Density, g / cm Viscosity, s

Uh

Durability .kgs / cm at a temperature:

Continued tabl, 1

1.5-1.6 1.5-1.6 1.5-1, .6 1.5-1.6 20 20 20. 20

Claims (3)

The formula of the invention Non-stick paint for foundry molds and cores, mainly from self-hardening mixtures, including tetrabutoxy titanium or polybutyl titanate, polyisobutylene, refractory filler and solvent, characterized in that, in order to increase the strength and heat resistance of the paint, it additionally contains tricresyl phosphate and tributyl phosphate ,. wt.%: Tetrabutoxy titanium or polybutyl titanate 2.0-2.4 Polyisobutylene 0.5-0.6 Tricreyl phosphate or tributyl phosphate Refractory filler Solvent Sources 0.25-0.4 50.0-60.0 Other information. taken into account during the examination 1. USSR author's certificate No. 470144, cl. B 22 C 3/00, 1974. 2. Pine G.F. Technology of organic coatings. M., Mechanical Engineering, 1959, p. 677-679. 3. Development of non-stick coatings that improve the surface quality of steel and cast iron castings. Report CNYITmash. M., 1969, p. 43. ВНИИПИ Order 3/28/71 Circulation 869 Subscription Branch of the PPP Patent, Uzhgorod, Project 4,