ABSTRACT
Possibilities of cross-linking of new polymer binders from the BioCo group, their hardening in moulding sands at the application of cross-linking agents both physical and chemical are presented. Their thermal stability was determined. It was proved, that moulding sands bound by the BioCo binders are characterised by the compression
strength of an order of 2 MPa, and the bending strength of 1 MPa, after 1 hour of a sample curing. The worked out BioCo binders are biodegradable and renewable in the part which was not completely burned. The investigated
moulding sands with the BioCo binders are easily knocked out and have a good susceptibility for mechanical
reclamation processes.
INTRODUCTION
Polymer binders applied in foundry practice contain synthetic or natural polymers dissolved in appropriately
selected solvents [1, 2]. Among synthetic polymers are polysiloxanes, sodium polyacrylan and polyacrylic acid
[3]. Papers dealing with the development of binding agents and processes using biopolymers and their derivatives
can be also found [4-7]. Within the engineering of foundry processes increasing demands concerning technical, ecological and economic parameters of binding materials are presently observed. This fact supports the development of new technologies and utilising new binding agents as well as the explanation of accompanying cross-linking and
degradation processes. This knowledge facilitates designing and control of the technological process and obtaining
– at the fi nal technological state – the sound.
castings of the required dimensions
.
http://www.pfa.org.pk/wp-content/uploads/2017/04/New_BioCo_binders_containing_biopolymers.pdf
