Dimethylol ethylene urea

Dimethylol ethylene urea
IUPAC name Dimethylol ethylene urea
Identifiers
CAS number	136-84-5
Properties
Molecular formula	(C2H2N2(CH2OH)2)CO
Molar mass	146.14g/mol
Appearance	White resin
Melting point	161-163℃
Boiling point	342.6±27℃
Solubility in water	72g/L H2O at 25℃
Y ethylene urea (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Dimethylol ethyleneurea is an organic compound derived from formaldehyde and urea. It is a colourless solid that is used for treating cellulose-based heavy fabrics to inhibit wrinkle formation. Dimethylol ethylene urea (DMEU) bonds with the hydroxyl groups present in long strain cellulose chains and prevents the formation hydrogen bonding between the chains, the primary cause of wrinkling.

Mechanism

Wrinkles form in cotton fabrics due to the free hydroxyl groups. Cotton is a form of cellulose chains linked to form firm three dimensional structures that offer both tensile strength and flexibility due to their carbon-carbon and carbon-oxygen bond based backbone. Since cellulose is composed of glucose units, cyclic carbohydrate molecules, cellulose has free hydroxyl groups (-OH) projecting from each monomeric subunit. These hydroxyl groups tend form hydrogen-bonds to neighboring hydroxyl groups. When the fabric is stressed either by heat or pressure, the original hydrogen bonds in the cotton fabric break and reform with nearby atoms at random. This re-forming of the hydrogen bonds, known as cross linking, is the reason for wrinkles, or creases, in the fabric. DMEU works to prevent these wrinkles by covalently bonding to two free hydroxyl groups in the fabric through a dehydration reaction that is not as easily broken as the hydrogen bond before treatment.

As seen in the figure, this formation of a C-O bond through a dehydration reaction (loss of water) allows the fabric to be bleached and heated to reasonable temperatures without fear of breaking the C-O bonds formed.

DMEU is applied industrially to the fabric after all the creases desired for design are in place. The fabric is heated and a DMEU resin is slathered on to the fabric. Depending on the procedure, the residue may contain metal catalysts or acid catalysts to help with the reaction.

Production

The production of DMEU is through the condensation of formaldehyde with ethylene urea:^[1]

2CH₂O + (C₂H₄N₂H₂)CO → (C₂H₂N₂(CH₂OH)₂)CO

The reaction proceeds around 200 °C but this temperature can be brought down to around 70 °C in the presence of an acid catalyst.^[2]

History

Before the development of DMEU, formaldehyde and its derivatives were used as anti-wrinkle agents. These agents could successfully inhibit wrinkle formation. After contact with hydroochlorate bleaches at high temperatures, however, the treated fabric released hydrochloric acid, which degraded the fabric. Additionally, formaldehyde evaporates easily and and is pungent. A search for stabler alternatives to formaldehyde led to dimethylol formaldehyde derivatives such as DMEU.

The five member ring structure of DMEU, a 2-imidazolidone, resists attack by chlorine during bleaching. As an additional advantage, DMEU can be used to treat fabrics at relatively mild conditions and does not release pungent smells. The use of DMEU on cotton was patented by Rohm and Haas Co. in 1941. As suitable as DMEU was as an anti-wrinkle agent, it decreases dramatically the tensile strength of the fabric. Because DMEU inhibited new hydrogen bond formation, it also hindered cottons ability to shift its cotton fibers to spread out pressure applied to the fabric. This problem regarding the loss of tensile strength is common amongst cotton treatments. Currently, DMEU is used along with other formaldehyde urea derivatives for cotton fabrics of varying tear strength, color, softness, and ease of care.

Health Concerns

DMEU is a formaldehyde derivative and thus has been known to cause irritation of the skin and allergic reactions from those who are exposed to the resin for extended periods of time. DMEU is a mild irritant and if consumed in moderate quantities may have adverse effects on the body.

References

1. ^ Wayland R. L. Manufacture of Ethylene Urea and the Dimethylol Derivative Thereof. Patent. March 4th, 1958, Serial number: 654,645.
2. ^ Ziifle, H. M.; Berni, R. J.; Benerito, R. R. (1961). "Investigation of the Catalyst in the Cellulose-DMEU, Reaction: Part I: Effect of Catalyst upon the Physical and Chemical Properties of the Finished Cottons'". Textile Research Journal 31 (4): 349–365. doi:10.1177/004051756103100408. 

Further readings

• Vargantwar, P. H. Preparation of Ionic Cellulose for Wrinkle Resistant Fabrics. 2007. North Carolina State University: Textile Chemistry. Masters Thesis
• Petersen, H. (1968). "Reaction Mechanisms, Structure, and Properties of Methylol Compounds in Cross-Linking Cotton1". Textile Research Journal 38 (2): 156–176. doi:10.1177/004051756803800208. 
• Julin van Loo, W., Salsbury, J. M. Process for Treating Textiles with Ethylene Urea-Formaldehyde Reaction Products. Patent. August 4th, 1959. Serial number: 605,190.
• Reinhardt, R. M.; Harper, R. J. (1984). "A Comparison of Aftertreatments to Lower Formaldehyde Release from Cottons Crosslinked with Various Finishing Agents". Journal of Industrial Textiles 13 (4): 216–227. doi:10.1177/152808378401300404.