Hydrolytic and Oxidation method
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| Desizing process |
In desizing process, to convert starch into glucose, there are two ways as follows-
Two types of methods are made on two types of reactions during Desizing -
(A) Hydrolytic method.
(B) Oxidation Method
These two types of reactions convert starch into alpha glucose.
Hydrolytic method
Chemically, starch is a mixture of amylose straight chains and amylopectin branching chains that are insoluble in water.
They can be rendered soluble by hydrolysis, which produces an Alpha glucose unit that is soluble in water.
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| Hydrolytic method |
Oxidative method
With the help of nascent oxygen (O), starch is oxidized and transformed into Dextrin.
Under ideal chemical and temperature circumstances, oxidizing agents liberate nascent oxygen, which aids in the oxidation of starch into a water-soluble state.
Strong oxidizing agents should be used which give nascent oxygen.
Ex. KMnO4, NaOCL, H2O2, Sodium bromite, etc.
Advantages | Disadvantage- |
This method is suitable for blend composition. | If conditions are not followed then oxycellulose formation takes place which hampers the fabric. |
Excellent & uniform removal of size. | Machine corrosion takes place. |
Energy & water consumption is less. | The process is costly. |
It can be combined with preparatory processes like scouring, bleaching, etc. | Working with chemicals is harmful to the human body. |
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| Oxidative method for desizing process |
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| Oxidative method for desizing process |
Questions -
- What are the two methods of desizing reactions?
- Describe hydrolytic method for desizing with its reactions.
- Describe oxidation method for desizing process with its reactions.
References
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Get to know about chemical processing of textile materials. (2022, May 10). ECHEMI. https://www.echemi.com/cms/640314.html
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Vigo, T. L. (2014). Textile processing and properties: Preparation, dyeing, finishing and performance: Preparation, dyeing, finishing and performance (1st ed.). Elsevier Science & Technology. https://www.elsevier.com/books/textile-processing-and-properties/vigo/978-0-444-88224-0?country=GB&format=print&utm_source=google_ads&utm_medium=paid_search&utm_campaign=ukshopping&gclid=CjwKCAiAhqCdBhB0EiwAH8M_Gn3kr_d2paqVzccxckWobOsLcwl0cD_Mu6vA5I-eqFARiZwx32eUOxoC-LMQAvD_BwE&gclsrc=aw.ds
(N.d.). Textilelearner.net. https://textilelearner.net/flow-chart-of-textile-wet-processing/
Babu, S. (n.d.). Textile Adviser. Textileadvisor.com. from https://www.textileadvisor.com/2021/12/fabric-desizing-process-types-of.html
Desizing. (n.d.). Kemin. from https://www.garmonchemicals.com/en/textile-chemicals/garment-denim-finishing/enzyme-desizing
Landage, S. M. (2022). Biotechnological approaches in desizing of textile materials. In O. L. Shanmugasundaram (Ed.), Applications of Biotechnology for Sustainable Textile Production (pp. 47–73). Elsevier.
Madhu, C. (n.d.). TEXTILE CHEMROSE. Blogspot.com. from https://textilechemrose.blogspot.com/2015/12/desizing.html
Process of cotton Textile Materials desizing. (2013, September 12). Fibre2fashion.com; Fibre2Fashion. https://www.fibre2fashion.com/industry-article/7064/problems-in-desizing-cotton-textile-materials
Trivedi, Y. (2021, May 9). Textile Desizing process. Textilesphere.com. https://www.textilesphere.com/2021/05/desizing-textile.html
Further reading,
Part 2 Desizing process reactions - Hydrolytic and Oxidation method
Part 3 Three chemicals that carried out desizing
Part 4 Rot steep and Acid steep methods for desizing
Part 5 Alkali desizing
Part 6 Hydrolytic desizing
Part 7 Desizing with the help of the Enzymes
Part 8 Continuous desizing process (Winch and J-box)
Part 9 Desizing of polyester-cotton blends
Part 10 Padroll and padsteam desizing
Part 11 Novel desizing
Writer - Rushikesh Patil (Textile Engineer)
