How to whiten Acrylic fiber

What is Acrylic Fiber

As we know, Acrylic fiber is the trade name of polyacrylonitrile fiber. It is a copolymer composed of acrylonitrile (the first monomer) and other comonomers. The content of the first monomer acrylonitrile accounts for about 85%, and the rest is the second and third monomers that are added to improve the dyeing property and textile processability. Acrylic fibers can be dyed either by pigmentation of the dope or with jel dyeing systems. It can be used 100% alone, or in blends with other natural and synthetic fibers, such as acrylic wool blends, acrylic polyester blends, and acrylic cellulose fiber blends. While the whiteness of the raw acrylic fibers is usually unsatisfactory, whiten acrylic fibers becomes important to enhance the appearance of the product.

How to whiten Acrylic fiber

According to the whiteness requirement of pure acrylic yarn and fabric and the whiteness level of the fiber itself, we can choose bleaching and fluorescent whitening process. Sometimes, the fiber itself already has a certain whiteness, so it can be optical brightening directly without bleaching. In addition, Acrylic yarns or fabrics used for fluorescent whitening must be clean and white products without stains and batch color addition, otherwise, we can not achieve the expected whitening effect The most commonly used cationic whitening agent is Uvitex BAC, which is a benzimidazole derivative first developed by Ciba. Due to the long-term market verification and the maturity of the technology， Now it has become the mainstream whitening agent for acrylic whitening.

Here below is the TDS of BAC-L

Name : Optical Brightener BAC-L

Appearance: Dark brown liquid

Ionicity : Cationic

Main ingredient : Benzimidazole derivative

Shade: Neutral to light bluish

pH : 3-4

Counter quality : Uvitex BAC-L, Leucophor ACK

Feature:

1. Specialized to whiten acrylic fiber and its blend fibers, and diacetate fabrics. such as acrylic wool blends, acrylic polyester blends, and acrylic cellulose fiber blends.
2. Suitable for exhaust dyeing and pad dyeing methods. Suitable for dope dyeing and gel dyeing.
3. Not stable to Alkalis, stable to Acids / Hard water/ Chlorite / Hypochlorite / Hydrosulphite。
4. Low toxicity, can be in direct contact with human skin, and no harm to the human body.
5. Excellent light fastness and wet fastness properties.
6. with low dosage can achieve high whiteness and bright color.

Optical brightener BAC-L for acrylic fiber