Study on synthesis and properties of modified starch binder for foundry

Zhou, Xiaojian; Yang, Jing; Qu, Guohui

doi:10.1016/j.jmatprotec.2006.11.001

Cited by 52 publications

(40 citation statements)

References 10 publications

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“…The solubility in cold water increases with DS value [14]. Moreover, water absorption, adhesiveness and film forming ability increases [15]. Zhou et al [16] used highly substituted CMS as the main foundry adhesive.…”

Section: Introductionmentioning

confidence: 99%

Water-Soluble Pressure-Sensitive Adhesives Containing Carboxymethyl Starch with Improved Adhesion to Paper

Wilpiszewska

Czech

2017

J Polym Environ

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Section: Introductionmentioning

confidence: 99%

Water-Soluble Pressure-Sensitive Adhesives Containing Carboxymethyl Starch with Improved Adhesion to Paper

Wilpiszewska

Czech

2017

J Polym Environ

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“…As the binder in the moulding sands were used the two products obtained from native potato starch in etherification method [3]. Binders in the form of the sodium salt of carboxymethyl starch were applied in solid state (powder) and were introduced in a dry state to the mixer.…”

Section: Bindermentioning

confidence: 99%

“…However, the modified starch is clearly preferable to applying in this role. Starch derivatives are more interesting materials because in contrast to native form they are soluble in cold water and form viscous stable solutions with good adhesiveness [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…Carboxymethylation reaction is conducted in two stages in accordance with the course of the etherification in Williamson reaction, and the characteristic feature of the etherified starch is a degree of substitution (DS), which is the average number of carboxymethyl groups (-CH2COOH) or sodium carboxymethyl groups (-CH2COONa) substituted in glucopyranose unit (the monomer of starch) [8]. Results of research on applications of sodium carboxymethyl starch in foundry demonstrated that with increasing degree of substitution of modified starch it is possible to increase the strength of moulds and obtaining the higher wear resistance [3,6].…”

Section: Introductionmentioning

confidence: 99%

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Studies on the Gases Emission under High Temperature Condition from Moulding Sands Bonded by Modified Starch CMS-Na

Kaczmarska

Bobrowski

Żymankowska-Kumon

et al. 2017

Archives of Foundry Engineering

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Emission of gases under high temperature after pouring molten metal into moulds, which contain the organic binder or other additives (solvents or curing agent), may be an important factor influencing both on the quality of the produced castings, and on the state of environment. Therefore, a comprehensive study of the emitted gases would allow to determine restrictions on the use of the moulding sands in foundry technologies, eg. the probability of occurrence of casting defects, and identify the gaseous pollutants emitted to the environment. The aim of the research presented in this paper was to determine the amount of gases that are released at high temperatures from moulding sands bonded by biopolymer binder and the quantitative assessment of the emitted pollutants with particular emphasis on chemical compounds: benzene, toluene, ethylbenzene and xylenes (BTEX). The water-soluble modified potato starch as a sodium carboxymethyl starch with low (CMS-NaL) or high (CMS-NaH) degree of substitution was a binder in the tested moulding sands. A tests of gases emission level were conducted per the procedure developed at the Faculty of Foundry Engineering (AGH University of Science and Technology) involving gas chromatography method (GC). The obtained results of the determination of amount of BTEX compounds generated during the decomposition process of starch binders showed lower emission of aromatic hydrocarbons in comparison with binder based on resin Kaltharz U404 with the acidic curing agent commonly used in the foundries.

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“…However, the results of studies of the properties of molding sand bonded by starchy binders show that adhesives based on native starch are not a fully effective alternative to the currently used commercial products, and only its derivatives can guarantee obtaining molding sands with the relevant binding strength and functional parameters [3][4][5][6]. The example of modified starch with suitable properties for the foundry industry is carboxymethyl starch as a sodium salt (CMS-Na) produced by etherification of native starch in monochloroacetic acid (or its sodium salt) in the presence of sodium hydroxide [7,8].…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition of binder based on etherified starch to use in foundry industry

Kaczmarska

Grabowska

Grabowski

et al. 2017

J Therm Anal Calorim

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In this work, the main purpose was the determination of the thermal stability of the modified starch: sodium carboxymethyl starch (CMS-Na) used in foundry technology as organic binder for molding sand. The analysis of the course of decomposition of the starch material under controlled heating in the range of 20-500°C was based on the results of thermal analysis methods (TG, DTG, DSC) in combination with the results of spectroscopic technology (DRIFT). The use of various methods of thermal analysis and spectroscopic methods was possible to determine more entirely the mechanism of the binder decomposition process comprising reactions at the molecular level with regard to the conditions prevailing in the mold. The onset temperature of degradation of the binder and at the same time the temperature at which it begins to lose binding properties were determined. It was found that the mechanism of the binder is multistage process. The decomposition of the starch binder CMS-Na involves the gradual evaporation of the water bound at a temperature of 20-120°C and water constitutional starch in the range of 120-200°C, degradation of the binder in the temperature range 200-342°C by breaking the glycosidic bonds in the polymer chains with the formation of volatile compounds and finally detaching the side groups and partial combustion of the starch material within a temperature range 342-500°C.

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Study on synthesis and properties of modified starch binder for foundry

Cited by 52 publications

References 10 publications

Water-Soluble Pressure-Sensitive Adhesives Containing Carboxymethyl Starch with Improved Adhesion to Paper

Water-Soluble Pressure-Sensitive Adhesives Containing Carboxymethyl Starch with Improved Adhesion to Paper

Studies on the Gases Emission under High Temperature Condition from Moulding Sands Bonded by Modified Starch CMS-Na

Thermal decomposition of binder based on etherified starch to use in foundry industry

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