Analyzing the causes of yellowing of cotton fabrics, the main reasons are:</p
1、纤维降解：因加热、光、其它辐射、化学品和生物降解的作用而使纤维降解。
2、添加剂：诸如加入柔软剂、油类、润滑剂、树脂、荧光增白剂和金属化合物引起的泛黄和色变。
3、大气污染物：诸如氮的氧化物、二氧化硫和臭氧的影响所引起的泛黄。
4、传输的污染物质：泛黄物的原始黄色素是从接触的纸、卡纸板、塑料薄膜或塑料包和用作石磨水洗的浮石传输给织物。
5、消费者的污染物质：如出汗和从家庭洗涤和漂白而得来的残留物。
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在贮藏期间，以苯酚类的泛黄普遍� Raw yellow pigments such as phenolic compounds or butylated hydroxytoluene [BHT] are transferred to the fabric from packaging materials such as cardboard, paper or plastic film during storage, where they are retained by nitrogen, oxidation and A yellow product formed by nitrophenol compounds or 1,2-stilbene produced by the action of chemicals. An alkaline environment is more favorable for this. �苯酚类的泛黄具有纯亮黄色色泽，在420~450nm处具有大的吸收特性，其暴露在光线或臭氧之下会褪色� �黄色产物溶解在热水和如酒精那样的极性溶剂中，并且在pH值5或更低的酸性介质中变成无色� �</p
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Measures to prevent yellowing caused by phenols include:</p
1. Avoid using brown paper, brown cardboard and plastic film containing phenol antioxidants to package finished products;</p
2. Avoid using plastic packaging based on heat shrinkage;</p
3. Provide good ventilation conditions during storage;</p
4. Use less phenol derivatives as additives;</p
5、避免整理过的成品呈碱性。
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此外，用柠檬酸做酸剂整理后，织物也容易泛黄。
究其原因：柠檬酸在受热时极易脱水形成酐，因柠檬酸在结构上比一般多元酸多一个羟基，属于羟基酸，在加热焙烘时脱水生成酸酐� �同时，分子中的羟基和邻位上的氢也可能受热和外部环境的影响进一步脱去，生成不饱和酸（丙烯三酸），并有可能脱去水和CO2形成衣康酸� �这些不饱和酸容易使布面泛黄，因此好不要用柠檬酸做白布的酸剂�
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