SU1342581A1 - Sand for making cores and moulds in tooling being heated up - Google Patents

Abstract

The invention relates to foundry, in particular, to mixture compositions for the manufacture of cores and molds in a heated tooling. The chain of the invention is an increase in the quality of the mixture by increasing its survivability and shortening the duration of curing in the heated tooling. The composition of the mixture, wt.%: Binder based on aluminum phosphates (aluminum-chromophosphate binder or magnesium yumophosphate binder) 2-4; polyelectrolyte (VPK-402) - (poly-N, N-dimethyl-3, 5-dimethylpiperidinium chloride) 0.2-0.7; quartz sand else. Due to the introduction of VPK-402 polyelectrolyte, the survivability of the mixture increases more than 7 times; the holding time of the rod in the heated snap-in is reduced by 3-4 times. 1 hp f-ly, 2 tab. Q CO NU Yu SP 00

Description

134

The invention relates to a foundry, in particular, to mixture compositions for the manufacture of cores and molds in a heated tooling, which can be used to produce iron castings of various modifications of steel and non-ferrous metals.

The purpose of the invention is to improve the quality of the mixture by increasing its survivability and reducing the duration in the snap.

Polyelectrolyte with the technical grade BIIK-402, which is a high-molecular compound of a linear-cyclic structure containing quaternary ammonium groups, is used as a polyelectrolyte. The structural formula of a polyelectrolyte unit cell (, K-dimethyl-3,5-dimethylene piperidinium chloride) is

12 ,

/ SNg

.sn

sno n: nnp

 /about.

ъ1-.о /

SNS CH.

since g

Jn

Polyelectrolyte is indefinitely soluble in BOfl.e, lower alcohols, solutions of acids and alkalis, non-combustible, non-explosive, non-toxic, does not have an unpleasant odor.

Use as a phosphate binder using a papoule aluminum-chromophosphate binder or a magnesium aluminum phosphate binder.

As a result of the curing of the binder system, under the action of the heat of the heated equipment, anion-coordinating bonds are formed to crosslink the spatial polymer, which causes the formation of a strong structure.

In tab. 1 shows the composition of the mixtures

Mixtures are prepared as follows.

Quartz sand and phosphate binder are metered into laboratory runners. After mixing for 1 minute, polyelectrolyte is added and mixed for 1.5-2.0 minutes. Samples are manufactured on a machine to make samples using a heated snap. For this purpose, fill the slit nozzle with the prepared Mixture and fill it with

rod box, preheated to 250 ° C, hold time set go time relay.

The results of testing the mixtures are given in Table. 2

As can be seen from the table. 2, the proposed mixture has the necessary gas permeability, low gas efficiency, which is optimal for the process of hot melters with raw strength. The mixture allows to increase the survivability of more than 7 times, to reduce the time of delivery in the core box 3-4 times with relatively identical strength indicators, which significantly increases the productivity of labor.

Claims (2)

1. A mixture for the manufacture of casting cores and molds in the heated tooling, including quartz sand, a binder based on aluminum phosphates and a hardening additive in the form of an amine compound, so that the quality of the mixture increases by increasing its vitality and reducing its duration curing agent in rigging, the mixture in: as a hardening additive in the form of an amine compound derivative contains polyelectrolyte (poly-N, N-dimethyl-3,5-dimethylene piperidinium chloride) with the general structure 0 / SNG  snnn ,,, sno ., cr g /: t ... / SNO, SNT, P SO 45 with the following ratio of ingredients, wt.%: Binder based on aluminum phosphates 2-4 Polyelectrolyte- (poly- -N, M-dimethyl-3, 5-dimethylene piperidinium chloride O, 2-0.7 Quartz sand Else 2. A mixture according to claim 1, which differs from the fact that, as a binder based on aluminum phosphate, it contains an aluminum-chromophosphate bond or a magnesium aluminophosphate bond. 1342581 Table 1 The composition of the mixture, wt.% Ingredients - ut 1st 2nd 3rd 4th Quartz sand 061K0315B, 02A97.8 96.6 95.3 97.1 Aluminum Chromium Phosphate binding - - - - 2,5 Magnesium phosphate binder2.0 3.0 4.0 Polyelectrolyte VPK-402 0,2 0,4 0,7 0,4  ITABLE2 Composition Indicators1j1 1st 2nd 3rd 3rd Tensile strength, kgf / cm, after curing at 250 j: 10 ° C for, s: thirty 45 60 120 Vitality, min Gas production Compressive strength raw mixtures, kgf / cm Gas permeability, units Editor P. Geresi Compiled by S. Teplov Tehred And, Popovich Proofreader A. Tsko 4549/8 Circulation 740 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Design, h 8.8 4.5 6.8 8.3 4 6.5 6.3 9.8 14.6 7.1 62 9.9 0.045 0.031 405 420 5.4 10.9 14.7 four 8.6 42 6.4 0.032 340