Fluorescent whitening agent APC (4-sulfonic acid)

Optical brightener APC (4-sulfonic acid) is a highly efficient optical brightener widely used in the paper industry. This compound increases the brightness and whiteness of paper, providing a visually appealing product. The optical brightener APC (4-sulfonic acid) has excellent water solubility, resistance to hard water and stability to bleach, making it ideal for a variety of applications in the paper production process.

Product application:
1. Whitening of cotton fiber and viscose fiber:
- The optical brightener APC (4-sulfonic acid) is used to increase the whiteness of cotton and viscose fibers.
- This application is particularly important in the production of high-quality paper, since the whiteness of the fibers has a significant impact on the appearance of the product.
2. Discharge printing paste:
- This whitening agent is ideal for use in discharge printing pastes, helping to achieve brilliant white patterns.
- It ensures the consistency and clarity of patterns and improves the overall quality of printed paper products.
3. Fluorescent whitening in pulp:
- The optical brightener APC (4-sulfonic acid) is added to the pulp during the papermaking process to achieve a uniform whitening effect.
- This method ensures a consistent whiteness throughout the entire structure of the paper.
4. Surface sizing and fluorescent whitening:
- During the surface sizing process, the optical brightener APC (4-sulfonic acid) can be used to increase the surface brightness of the paper.
- This technique improves the visual effect of the paper without affecting its structural properties.
5. Fluorescent whitening in coating process:
- The use of whitening agents during the coating process can achieve a higher whiteness on the paper surface.
- This application is particularly suitable for coated paper types such as glossy and matt papers, ensuring a high-end appearance of the paper.

Product advantages:
1. Excellent water solubility:
- The fluorescent whitening agent APC (4-sulfonic acid) can be well dissolved in water and can be easily integrated into various papermaking processes.
- This solubility ensures even distribution on the paper, thereby improving overall whiteness.
2. Resistant to hard water:
- Unlike many whitening agents, the optical brightener APC (4-sulfonic acid) is not affected by hard water containing calcium (Ca2) and magnesium (Mg2) ions.
- This feature ensures its stable performance under different water conditions, making it a reliable choice for paper manufacturers.
3. Stability to bleach:
- The whitening agent has good stability to bleaches (including bleaches containing reducing agents such as sodium disulfite).
- This stability ensures that the whitening effect is maintained even in the presence of these chemicals.
4. Performs well under alkaline conditions:
- Although the optical brightener APC (4-sulfonic acid) is generally acid-resistant, it performs well under slightly alkaline conditions (pH greater than 7). It is therefore particularly suitable for papermaking processes operating in this pH range.

Features:
1. High water solubility:
- Its good water solubility ensures easy application and uniform distribution during the papermaking process, a feature that increases the efficiency and effectiveness of the whitening process.
2. Not sensitive to hard water:
- The whitener's performance is not affected by hard water ions such as Ca2 and Mg2, this insensitivity ensures consistent results in a variety of water qualities.
3. Good alkaline performance:
- The brightener works well at pH values ​​greater than 7, a property that is consistent with many papermaking production environments and improves its applicability.

Instructions for use:
To obtain ideal results, it is recommended to use the optical brightener APC (4-sulfonic acid) as follows:

Pad dyeing process:
- Temperature: 95-98°C
- Duration: 10-20 minutes 10-20 minutes
- Liquor ratio: 1:20
- Steaming time: about 45 minutes
- Dosage: 0.1-0.5% 0.1-0.5%

By adhering to these guidelines, paper manufacturers can achieve ideal whiteness and brightness levels for their products.