SU1423250A1 - Composition of nonstick emulsion for foundry practice - Google Patents

Abstract

The invention relates to foundry and can be used in the preparation of moldable mixtures, water-based non-stick paints and coatings for model tooling. The purpose of the invention is to improve the uniformity of the distribution of the emulsion in the volume of sandy-clay mixtures or liquid glass paints due to an increase in resistance to coalescence and delamination. The goal is achieved due to the fact that the emulsion contains a hydrophobic material selected from the group of the extract after the purification of oils or fuel oil, or mineral oil, 10-55 wt.%; lubricant compounds with an omylenia number of 95-250 mg KOH / G 3 —15 wt.%; an inorganic-type scavenger selected from alkali metal hydroxides or water-soluble alkali metal bicarbonate salts, 0.3 - 1.5 wt.%; water - the rest. At the same time, the composition as saponified compounds with the specified saponification number contains fatty or oily tar or bottoms of synthetic fatty acids, or soap stock, and the ratio between the hydrophobic antiburning material, emulsifier and saponifier (in wt.), Respectively

Description

The invention relates to foundry and can be used in the preparation of molding compounds, water-based non-stick paints and coatings for model tooling.

The purpose of the invention is to improve the uniformity of the distribution of the emulsion in the volume of sandy-clay mixtures or liquid glass paints by increasing resistance to coalescence and delamination,

The following materials can be used as a hydrophobic material of the selected and C groups of the post-phenolic oil purification: selective oil purification extract (ESOM), potassium phytophorobitizer (GFK), oil plasticizer (PN-6), fuel oil and waste oils for various purposes, 3COM obtained by phenol purification of oil fractions during the distillation of fuel oil. It is a highly aromatic oily compound, GPC-oil product, which contains 65% of highly aromatic fractions and 35% of light and medium fractions of oil. The pour point is not higher than 30 ° C, the density is 0.965 - 0.99 g / s, the kinematic viscosity at 15-25 is, the cost is 26 rubles / ton.

mi-6 (GOST) is obtained at refineries by adding to the residual highly aromatic fraction of the light and medium-iiiix fractions of the extract selective

oil purification in the amount of up to 35%, the freezing temperature is not higher than 36 ° C, the density is 0.95 - 0.98 g / cm, the cost is 36 rubles / ton.

Products of de-aromatization of oils are aromatic compounds, obtained as a result of processing of oils from West Siberian fields.

Fuel oil (GOST 10585-75) is an oil fuel intended for boiler plants and industrial furnaces. This is a heavy residue after distillation from non-fuel fractions. The properties of fuel oil vary widely, depending on the crude oil. Conditional viscosity at 50 ° C varies from 3.6 to 3 ° E, compacti - from 0.88 to 0.95 g / ohm, the temperature of vanishing is from -8 to 1-42 ..

Waste oils are waste and are a group of mao

5 0 5 Q

villages used to lubricate all types of gears of various industrial equipment. The conditions of operation of these oils are varied, therefore, various additives are introduced into their composition. Used oils consist mainly of mixtures of distillate and residual mineral oils. As a result of operation, the oils thicken and must be replaced. Some of the waste oils are subjected to regeneration, but a significant amount of them is thrown away,

As an em: 1g emulsifier with an amount of omylyeni from 95 to 250 mg KOH / g - fat or oil tar or bottoms of synthetic fatty acids (CO FFA) or soap stock.

Oily tar - waste, obtained in the process of purification of fats from impurities by sedimentation and filtration, followed by distillation of the product, contains oils, carbolic acids and mechanical impurities of organic and inorganic type.

Fat tar - waste soap production, obtained after the distillation of fat; acids in the process of splitting solid fats. Fatty acids are the main part of it, as non-split glycerides, glycerin and other substances are present as a whole.

In appearance, the tars are a thick, viscous mass of different consistency (from fluid to solid) from dark brown to black. Their physical properties vary widely depending on the initial products and production technology. Other emulsions can also be used as emulsifiers (for example, acid j5 oil refining tars, soap stock tar, second fat tars, etc.). provided that the number of their oatmeal is in the range of 95 to 250 mg KOH / g,

Alkali metal hydroxides (KOH or NaOH alkalis) or Bodisoluble are used as an inorganic type of amygate: e salts of alkali metal bicarbonates (soda ash, potash).

The ratio of the individual components of the emulsion is due to its properties: rheological and sedimentation status 5, dispersion, concentration

0

50

five

pam-ieii of the dispersed phase, ycToitnuHostyu to coalescence. The optimum content of the hydrophobic protinigar material (dispersed) in the emulsion is in the range from 0 to 55% by weight.

The consumption of the emulsifier is due to the requirements on the degree of disintegration of the dispersed phase, sedimentary stability and resistance to coalescence.

With this material composition, the emulsion formation mechanism is as follows. In case of mutual polarization, the emulsifier and the amygulator form

sodium or potassium soaps of fatty acids with a specific (up to 12 to 18 carbon atoms) molecular chain length and unbranched structure. These compounds, due to their molecular structure, are a very effective protective layer that reliably covers drops of dispersed anti-sinter additives. high dispersed and stable emulsions of high concentrations are created.

To prepare these emulsions, it is recommended to use soft water with a hardness number of about 8 mg eq / l. Example. The calculated amount of non-stick material (1IH-6 and emulsifier (fatty tar)) is heated to a fluid state (50 - 60 ° C) and mixed until a homogeneous mass is obtained (within 2 to 3 minutes). The suspended amyllant — caustic soda — is dissolved in heated to 60-65 ° C water. The amount of water to dissolve the amygulator is adjusted so that the resulting solution has a concentration of not less than 3%. The liquid mixture of non-stick material with an emulsifier is evenly poured with continuous stirring at high speed (approx. about 2000 rpm) stir the mixer in a hot aqueous solution of the soapant and after completion of loading the mixture is stirred for 10 minutes, after which, if necessary, add the remaining water and stir for another 3 minutes. The emulsions thus prepared are subjected to process tests. The test results are given in Table 1.

Similar results were obtained using emulsions with oily tars with different numbers of ohms of the shadow, are given in Table. 2. State and properties of emulsions on

the basis of fuel oil are given in table. 3

The relative viscosity of suspensions over 0.5–5 days is given in Table. 4. As can be seen from the presented experimental materials, the conditional viscosity of the proposed emulsion compositions is significantly lower than the known and practically does not change over a long period of time.

Properties When using the proposed emulsion emulsion in the molding sand and clay mixture and in the coating for the molds are given in Table. 5 and 6.

The composition of the mixture for crude forms, wt.7o:

Revolving mix 95

Refreshing Additive3

2.3 emulsion (over 100)

At the same time, the refreshing additive contains wt,%:

Sand 80.43

Bentonite 16.09

Tar 2.9 Coating composition, wt.%:

Filler (talc) Z

Liquid glass3

Emulsion number 3

in table 5

Claims (3)

 1. The composition of the nonstick emulsion for the foundry, including a hydrophobic material selected from the group of the extract after the purification of oils or mazut or mineral oil, an emulsifier, 51423250 This is characterized in that, in order to uniformize the distribution of the emulsion in the volume of sandy-clay mixtures or liquid glass paints due to its resistance to coalescence and delamination, the composition as emulsifier contains saponified compounds with a sapylation number of 95 - 250 mg KOH / g and s additionally - 9M1 inorganic type binder selected from the group of alkali metal hydroxides or water-soluble bicarbonate salts Omyleni 95 250 mg KOH / G 355 Inorganic type scavenger selected from alkali metal hydroxides or water-soluble salts of bicarbonate alkali metals 0.3 - 1.5 Water Rest 2. The composition according to p., About tl and h a yu shch and the fact that as ohmy20 alkali metals in case of follow-up of 15 liters of compounds with the number of saponified 95 - 250 mg KOH / g composition contains fatty or oily tar, silt residues of synthetic fatty acids, or soap stock. 3. The composition according to claim 1, about t l and h and U and shchy so that the hydrophobic antiburning material, emulsifier 0 55 and the suppressor have the following ratio, respectively, wt.%: (4-18): 1: 25: (O, 1-0.3). Table 1 wearing ingredients, wt.%; Hydrophobic material selected from the group extract after phenolic purification oils or fuel oil, or mineral oils Remaining joints with number Saponis 95 250 mg KOH / G 3 inorganic type scavenger selected from alkali metal hydroxides or water-soluble bicarbonate salts of alkali metals 0.3 - Water Rest 2. The composition according to p., About tl and h and Yu and shch with the fact that as ohms PN-6 Caustic soda but Fat tar (g.0. 1 10 MG / Y) Water The average size of the drops, MKM. State after 5 hours. foam coalescence thickening State - in 24 hours 40 1.0 ten 49 7 55 1.5 15 28.5 Nb TNet No no No no Not. Not Insignificant No no no Soda Calcinerna Oily gudro ch.o. 85 ch.o. 95 ch.o. 150 ch.o. 250 ch.o. 300 Water Coalescence after 5 h in 24 hours Stratification after 5 h after 24 h Z. Augustation after 5 h in 24 hours ten ten ten -ten 49 49 4949 No no no no No no no no No no No no No no No no No no no no No no Noticeable Demanding thickening No no Table3 No No No Yes l00 to to to . 10 0.3 3.0 86.7 AO 1,0 10 49 55 1.5 15 28.5 10 0.3 3.0 86.7  40 1.0 10 49 55; 1.5 15 28.5 10 0.3 3.0 86.7 40 1,0 10 49 55 1.5 15 28.5  Ta b Eggs a 4 11.0 11.0 11.2 11.5 12.3 12.2 12.5 13.0 16.5 16.7 .16.7 18.0 11.3 11.2 11.3 11.3 12.9 13.0 13.0 13.5 17.0 17.3 17 17.7 12.0 12.3 12.3 12.8 13.7 14.0 14.0 14.5 17.8 18.0 18.5 22.0 Properties of the mixture and castings Vlad Cheese strength compression Carbon content Gas The presence of a burn on. castings Table Properties Units Coating composition measurement with emulsion number 3 on the table. one I “-. J.,. .... .. amount with a piece 12-15 Surface roughness of castings I lkm 60 - 45 Sedimentation Visually stable No change Compiled by I. Kunitska Editor I. Knsard Tehred M. Khodannch Proofreader L. Patay Order 4470/13 Circulation 741 Subscription VNIIPI rocyAapc flBeiiHoro Committee. the USSR for inventions and discoveries 113035, Moscow, F-355 Raushsk nab., d, 4/5    -, "L ™ 0" "im ™" ..., "0" VZH, va in "" ..-., ----. „ production and printing company, Uzhgorod, st. Project, 4 Table3 The composition of the mixture with an emulsion At 3 table. one Number 3 3.4 0.135 0.75 4.5 - 5 About 2