A more earth-friendly way to make bright white cotton fabrics

May 28, 2014

With a growing number of consumers demanding more earth-friendly practices from the fashion world, scientists are developing new ways to produce textiles that could help meet rising expectations. They report in the ACS journal Industrial & Engineering Chemistry Research one such method that can dramatically reduce the amount of energy it takes to bleach cotton while improving the quality of the popular material.

Quan Zu and colleagues point out that the cotton industry's current whitening techniques require bleaching the natural fiber at very high temperatures with . Although this method results in the bright white material consumers have grown so fond of, it also lowers the quality of the material and takes a lot of energy to carry out. Multiply that by the 7.3 billion pounds of cotton produced in the U.S. alone, and the energy needs soar. To cut down on the energy the textile industry uses to make cotton, Zu's team targeted its efforts toward lowering the bleaching technique's high temperatures.

They developed a novel compound that, when used with hydrogen peroxide, drops the bleaching temperature down to 140 degrees Fahrenheit from 200 degrees. The authors estimated that 60 degree difference would result in a process requiring less than half the as the commercial technique. It also produced less wastewater, improved the weight of the material and performed its original function—whitening the cotton. Since many destined to become clothing eventually take on various hues, the scientists also tested dyes and found the cotton bleached at the lower temperature could be made just as vibrant as its high-heat counterpart. They successfully showed the treatment's effectiveness on knitted fabric in commercial scale trials.

Explore further: Aromatic couple makes new chemical bonds

More information: "A Novel Low Temperature Approach for Simultaneous Scouring and Bleaching of Knitted Cotton Fabric at 60°C" Ind. Eng. Chem. Res., Just Accepted Manuscript, DOI: 10.1021/ie500062f

Exceedingly high temperatures (e.g., ~98°C) are used to perform hydrogen peroxide (H2O2) bleaching of cotton fabrics in industrial practice. Such harsh conditions lead to high energy consumptions and high fabric damages. In recent years, the industry and academic communities have conducted extensive research to reduce the temperature for industrial cotton bleaching processes. In our research, we have developed a new H2O2 activator based on amino nitriles and achieved the low bleaching temperature of 60°C. All the data demonstrated that in the presence of the new H2O2 activator, the combined scouring/bleaching of the knitted cotton fabric could be performed at 60°C with the fabric's whiteness and strength comparable to that treated using the traditional method at 98°C. The fabric treated with the low temperature procedure has lower fabric weight loss; some of the hydrophobic substances were retained on the fiber surface. We found that such an increase in hydrophobicity of cotton had little effects on the whiteness of the treated fabric after application of optical brighteners, shadedepth, color change after washing, and colorfastness to washing and rubbing. The higher weight retention of the treated cotton fabric also increased the value of the treated cotton knitted fabric. The removal of less substance from cotton also resulted in lower COD for the treatment bath, thus providing additional environmental benefits. Moreover, the low temperature scouring/bleaching procedure had significantly lower energy consumption than the traditional procedure. The effectiveness of this new technology has been proven in our industrial scale trials.

Related Stories

Cotton's potential for padding nonwovens

Sep 09, 2011

U.S. Department of Agriculture (USDA) scientists have conducted studies to investigate the use of virgin cotton in nonwoven materials and products. The work was led by cotton technologist Paul Sawhney and his colleagues at ...

Recommended for you

Substrates change nanoparticle reactivity

2 hours ago

(Phys.org)—Nanoscale materials tend to behave differently than their bulk counterparts. While there are many theories as to why this happens, technological advances in scanning tunneling microscopy (STM) ...

Reviving cottonseed meals adhesives potential

4 hours ago

Cottonseed meal—the leftovers after lint and oil are extracted from cottonseed—is typically fed to ruminant livestock, such as cows, or used as fertilizer. But Agricultural Research Service scientists ...

New concrete composite can heal itself

4 hours ago

In the human body, small wounds are easily treated by the body itself, requiring no further care. For bigger wounds to be healed, the body may need outside assistance. Concrete is like a living body, in that ...

Actuators that mimic ice plants

5 hours ago

Engineers developing moveable robot components may soon take advantage of a trick plants use. Researchers at the Max Planck Institute of Colloids and Interfaces in Potsdam and Harvard University in Cambridge ...

Aromatic couple makes new chemical bonds

23 hours ago

Esters have been identified to act as a new and clean coupling partner for the carbon-carbon bond forming cross-coupling reaction to make useful compounds for pharmaceuticals, agrochemicals and organic materials.

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.