Why does cotton fabric always turn yellow?

Share Why does cotton fabric always turn yellow? with your cle

Share on facebook
Share on twitter
Share on linkedin
Share on pinterest

release date:2021.02.01         17:00

Cotton Fabric

Analyze the causes of yellowing of cotton fabrics, including:

1. Fiber degradation: The fiber is degraded due to heat, light, other radiation, chemicals and biodegradation.

2. Additives: such as yellowing and discoloration caused by adding softeners, oils, lubricants, resins, optical brighteners and metal compounds.

3. Atmospheric pollutants: yellowing caused by the influence of nitrogen oxides, sulfur dioxide and ozone.

4. Transmitted pollutants: the original yellow pigment of the yellowing matter is transmitted to the fabric from the contacted paper, cardboard, plastic film or plastic bag and the pumice used for stone washing.

5. The consumer contaminants: such as sweating and residues from household washing and bleaching.

During storage, yellowing with phenols is the most common.

Measures to prevent yellowing caused by phenols include:

1. Avoid using brown paper, brown cardboard and plastic film packaging finished products containing phenol antioxidants;

2. Avoid using plastic packaging based on thermal shrinkage;

3. Provide good ventilation conditions during storage;

4. Use less phenol derivatives as additives;

5. Avoid the alkalinity of the finished product after finishing.

In addition, after finishing with citric acid as an acid agent, the fabric is also prone to yellowing.

The reason is that citric acid is easily dehydrated to form anhydride when heated. Because citric acid has one more hydroxyl group than general polybasic acids in structure, it is a hydroxy acid, and it is dehydrated to form anhydride during heating and baking. At the same time, the hydroxyl and ortho-position hydrogen in the molecule may also be further removed under the influence of heat and external environment to generate unsaturated acid (trimonic acid), and may remove water and carbon dioxide to form itaconic acid. These unsaturated acids tend to make the cloth surface yellow, so it is best not to use citric acid as an acid agent for white cloth.

Subscribe To Our Newsletter

Get updates and learn from the best

More To Explore

25 thoughts on “Why does cotton fabric always turn yellow?”

    1. I am very happy to receive your comments and I will continue to update the textile knowledge. If you have any questions, you can contact me at any time. Greetings

  1. Hmm it seems like your site ate my first comment (it was extremely
    long) so I guess I’ll just sum it up what
    I submitted and say, I’m thoroughly enjoying your blog. I as well am an aspiring blog blogger
    but I’m still new to the whole thing. Do you have any tips for first-time blog writers?
    I’d genuinely appreciate it.

  2. We absolutely love your blog and find the majority of your post’s to be exactly I’m
    looking for. Does one offer guest writers to write content for you?
    I wouldn’t mind creating a post or elaborating on a few of the subjects you write related to here.

    Again, awesome web log!

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top