SU82192A1 - Oilless fastener for core mixtures and method of its preparation - Google Patents

Description

In the foundry industry, the manufacture of fasteners for rods and their production is made of compositions about which their constituent parts are. is a vegetable oil.

In the proposed krenntele eliminated the need for the use of any oil due to the preparation of a mixture of the following composition (in irentants):

Peck wood 21

Hashepa lime. . . /. 6.5

Carbonic acid soda2,5

Casein 2-3 grade. . - 10.0

Caustic soda

Water drain

The method of preparation of the binder is as follows. Separately prepare two compositions. Odip composition consisting of 20% water, 0.1% caustic patra and 1.0% carbonate soda is heated to a temperature of 60-65 ° C and 21% of wood pitch is added to it with stirring. Another composition of 40% water, 1.5% carbonate soda and 10% is also heated to a temperature of 60-70 °. Both formulations are mixed in hot form. U is thoroughly mixed while adding to it 6.5% hydrated lime.

The stiffener prepared in this way is added to the core sand in an amount up to 7% by weight.

The core mixture prepared for this purposeful fixer has the following physicochemical properties: cheese and cycle from 0.12 to 0.15 kts: / (gas permeability 200-300 cm in 1 minute; humidity-5-6%; dry strength at eight not below 10 kgf / cm.

Up to 82129

P me d p p o fb

1. An oilless fastener for rod CMeceii, distinguished by this and that. that, in order to replace cementing agents containing vegetable oils and the composition of the resin, they are introduced: slaked lime, carbon dioxide soda, caustic soda, woody lek, casein and water.

2. Method of preparation of the fixer but also. 1, from those that are produced in a mixture of 20% water, 0.1% caustic soda, 1.0% carbonate soda and 21% wood pitch and composition of 40 % water, 1.5% carbon layer of soda and 10% caseia with simultaneous addition of 6.5% hydrated lime.