SU1159716A1 - Binder for making heat-hardened moulds and cores - Google Patents

Abstract

1, CONNECTING FOR THE MANUFACTURE OF THE CASTING OF FORMS AND ROD TESH10VO GO hardening, including the adymochromophosphate linkage and liquid organic material, due to the fact that, in order to improve the quality of the forms and rods, strength in the cured state, the binder contains a compound based on polyglycerol as a liquid organic material - a vat residue from the distillation of synthetic glycerin obtained by the interaction of allyl chloride with hypochlorous acid, followed by hydrolysis formed zpihlorhydrin, in the following ratio of ingredients, May.%: Alumochromophosphate bond 80-95 Compound based on polyglycerols 5 20 2. Binder co 1, from l and h a - -H. This is because the compound based on polyglycerols has the following composition, May. %: Glycerol4-5 Diglycerol71-75 Triglycerol4-5 Tetraglycerin12-13 Water5-6 jjQ 1:

Description

The invention relates to the foundry industry, in particular, to the compositions of light industry used to make foundry molds and cores. The chain of the invention is an increase in the quality of the forms and cores by increasing their strength in the cured state. The proposed binder contains 5-20% by weight of a compound based on polygdierines having the following composition by weight: Glycerin 4-5 Diglycerin 71-75 Triglycerol 4-5 Tetraglycerol 12-13 Water 5-6 This compound is a product of partial polymerization of glycerin and is a heavy waste. Injecting the type of compound is a thick, immobile dark-brown liquid without. foreign inclusions, the water content is 5-6 wt.%, the viscosity is 70% aqueous solution by the OZ-4 viscometer at 20 ° C, 60-100 s, the density at 20 ° С is 1.32 g / cm. The content of the polyglycerol compound based on the aluminum-chromophosphate binder (vat residue from the distillation of synthetic glycerol. Obtained by the interaction of allylchlorid with hypochlorous acid with the subsequent hydrolysis of the resulting epirchlorohydrin) enhances the strength properties of the rods and forms. The incorporation into the composition of the binder with a compound based on polygligene of cerin less than 5 wt.% Does not have a noticeable effect on the properties of the mixtures, and the decrease in its amount by more than 20 wt.% Reduces the strength properties. Binder is prepared by mechanical mixing of the components at 40 -50 ° C. At a temperature of 1-440 ° C, the efficiency of mechanical mixing is insufficient to obtain a homogeneous structure of the complex binder. At temperatures above 50 ° C, evaporation of moisture and sharp liquefaction are observed, and when the binder is cooled, an increase in the viscosity and density of the complex binder is observed, which makes it difficult to use because of the deterioration in the distribution of the binder around the mineral particles of the filler and the increase in labor intensity of mixing in the process preparation of mixtures. To eliminate the pre-binder operation, the preparation of the latter can be carried out in the process of preparing the mixture. To do this, laboratory runners load sand and clay, mix for 2 minutes, then add the required amount of polyglyderine-based cement and mix for 3 minutes. Then add an aluminum-chromophosphate binder and mix for 3 minutes, after which the mixture is ready for consumption. . . The invention is illustrated by the following data from Tables 1-3. From the data table. 3 it follows that the proposed binder possesses higher ligature strength indicators and ensures the manufacturability of core and molding sands. , Table 1

Alumochromophosphate bond

Polyglycerol-based compound

Sulphite-yeast brew Fastener KO

28.08-37.19

95

50.61-64.47 6.34-14.20

Table 2

Claims (2)

1. BINDING FOR MANUFACTURE OF CASTING FORMS AND THERMAL CURING BARS, including aluminum chromophosphate binder and liquid organic material, which is related to the fact that, in order to improve the quality of molds and cores by increasing their strength in the cured state, a binder contains as a liquid organic material a compound based on polyglycerols - a bottom residue from the distillation of synthetic glycerol obtained by the interaction of allyl chloride with hypochlorous acid followed by hydrolysis Osia epichlorohydrin, with the following ratio of ingredients, mass%.: Alumochromophosphate Binder 80-95 Compound based on polyglycerols 5-20 2. A binder according to π.1, which is due to the fact that the compound based on polyglycerols has the following composition, May. Z: Glycerin4-5 Diglycerin71-75 Triglycerin 4-5 Tetraglycerin 12-13 Water5-6> 1 1159716