@Article{fdmp.2023.028740,
AUTHOR = {Tianshu Wang, Guoqing Sun, Shaojun Zhang, Mingyu Wang, Jixin Wang, Yunwu Han},
TITLE = {Optimization of Animal-Glue Binders for Casting Applications},
JOURNAL = {Fluid Dynamics \& Materials Processing},
VOLUME = {19},
YEAR = {2023},
NUMBER = {11},
PAGES = {2923--2932},
URL = {http://www.techscience.com/fdmp/v19n11/54198},
ISSN = {1555-2578},
ABSTRACT = {In typical metal foundry applications, sand casting is still the most used technology. The related binder plays a
very important role as its performances can directly influence the quality of castings. Among many binders, glues
of animal origin have attracted much attention in recent years due to their reduced environmental impact. However, they display some drawbacks such as the tendency to coagulate easily at room temperature and a relatively
low strength. In this study, a novel gas-hardening casting binder was prepared using an animal glue and anhydrous potassium carbonate as a hydrolyzing agent to avoid undesired agglomeration. Moreover, sodium pyrophosphate and furfuryl alcohol were exploited as modifiers to obtain a binder with a high compressive strength. The
best modification conditions, determined by means of an orthogonal design matrix approach, were 4 g of
Na<sub>2</sub>CO<sub>3</sub>, sodium pyrophosphate, furfuryl alcohol and animal glue with a ratio of 4:12:100, at 85°C and with a
duration of 115 min, respectively. The viscosity of the mixture obtained under these optimized conditions was
1250 mPa⋅s. The compressive strength of the binder, hardened by CO<sub>2</sub> gas, was 4.00 MPa. Its gas evolution at
850°C was 15 ml⋅g<sup>−1</sup>
, and its residual strength after 10 min calculation at 800°C was 0.01 MPa, which is high
enough to meet the requirement of core-making in foundry. Moreover, after hydrolysis and further modification,
animal glue and modifiers displayed a grafting reaction and an esterification reaction, respectively, which made
the adhesive network denser and improved its thermal stability.},
DOI = {10.32604/fdmp.2023.028740}
}