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The estimation of ability to reclame of moduling sands with biopolymer binders

Major-Gabryś K., Dobosz S. M., Dańko R., Jakubski J.

Archives of Foundry Engineering

2011

Vol. 11, iss. 2

79-84

Applied up till now organic binding materials, on the basis of synthetic resins are characterised by good technological properties, but cause high emission of harmful substances. That's why contemporary scientific researches are leading to progressive replacing the binders obtained from petrochemical materials with polymer biocomposites coming from renewable resources. Increasing concern of aliphatic polyesters such as polylactide, polycaprolactone, poly(hydroxyalkanoates) and aliphatic-aromatic polyesters is caused by the possibility of using them for producing many biodegradable products. In that context it is important to expand the researches connected to using biopolymers as moulding sands binders. Contemporary authors' papers were focused on technological properties and harmfulness for the environment of this ecological moulding sands. This article takes into consideration the ability to reclamation of moulding sands with biopolymer binders.

The cross-linking influence of electromagnetic radiation on water-soluble polyacrylan compositions with biopolymers

Grabowska B.

Archives of Foundry Engineering

2009

Vol. 9, iss. 1

41-44

The results of examinations of the cross-linking influence of electromagnetic radiation - in a microwave range - on polyacrylan compositions with biopolymers, are presented in the hereby paper. The cross-linking process of the tested compositions was determined on the basis of the FT-IR spectroscopic methods. It was shown that microwave operations can lead to the formation of new cross-linked structures with strong covalent bonds. The adsorption process and formation of active centres in polymer molecules as well as in highsilica sand were found due to microwave radiations. In this process hydroxyl groups (-OH) - present in a polymer - and silane groups (Si-O-H) - present in a matrix - are mainly taking part. Spectroscopic and strength tests performed for the system: biopolymer binding agent - matrix indicate that the microwave radiation can be applied for hardening moulding sands with biopolymer binders.