Question 54 (Textile Engineering & Fibre Science)
A cotton fabric is finished with DMDHEU. As a result, its
| (A) | Tensile strength decreases, abrasion resistance increases, stiffness decreases |
| (B) | Tensile strength decreases, abrasion resistance decreases, stiffness decreases |
| (C) | Tensile strength decreases, abrasion resistance decreases, stiffness increases |
| (D) | Tensile strength increases, abrasion resistance increases, stiffness decreases |
[Show Answer]
Option C is correct
Frequently Asked Questions | FAQs
What is resin finishes?
DMDHEU (dimethyloldihydroxyethyleneurea) is a chemical compound that is commonly used as a crosslinking agent in textile finishing to impart durable press or wrinkle-resistant properties to fabrics. DMDHEU is a reactive resin that can form covalent bonds with cellulose fibers in the presence of heat and catalysts, resulting in improved dimensional stability, reduced shrinkage, and reduced wrinkling of the fabric.
The process of applying DMDHEU finish to fabric typically involves the following steps:
Preparation of DMDHEU solution: DMDHEU is dissolved in water or other appropriate solvent to create a solution with a desired concentration. Other additives, such as catalysts, wetting agents, or softeners, may also be added to the solution to optimize the finishing process and improve the properties of the finished fabric.
Fabric preparation: The fabric to be finished with DMDHEU is thoroughly cleaned and pretreated to remove any impurities or sizing agents that may interfere with the bonding of DMDHEU to the fibers. This may involve processes such as desizing, scouring, and bleaching, depending on the type of fabric and its condition.
DMDHEU application: The fabric is soaked or padded with the DMDHEU solution, ensuring that the solution is evenly distributed across the fabric. The fabric may be squeezed or passed through rollers to remove excess solution and ensure uniform application.
Catalyst application: A catalyst solution, typically containing an acid, is then applied to the fabric to initiate the crosslinking reaction between DMDHEU and the cellulose fibers. The catalyst helps to accelerate the reaction and ensures that the crosslinking is completed within a desired timeframe.
Heat treatment: The fabric is then subjected to heat treatment, usually by drying in a dryer or passing through a curing oven, to activate the crosslinking reaction between DMDHEU and the cellulose fibers. The heat causes the DMDHEU to react with the cellulose fibers, forming covalent bonds that result in a durable finish on the fabric.
Post-treatment: After heat treatment, the fabric may undergo additional processes, such as washing, rinsing, or neutralizing, to remove any residual chemicals and stabilize the finished fabric.
DMDHEU finish is widely used in the textile industry to improve the dimensional stability and wrinkle resistance of fabrics, particularly for cotton and cotton-blend fabrics used in apparel, home textiles, and other applications. It is important to follow appropriate safety and regulatory guidelines when handling and using DMDHEU, as it is a reactive chemical and proper precautions should be taken to ensure safe handling and application.