Fluorescent Brightener FB #71 for High-Brightness Paper Without Yellowing
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Solution Overview
Problem
Conventional optical brightener agents (OBA) and fluorescent whitening agents (FWA) face challenges such as yellowing due to overdosage, low retention rates, and high costs in achieving ultra-bright paper products with high stability, especially in papermaking processes involving mechanical pulp.
Innovation Solution
The new generation fluorescent brightener FB #71, with a distinct molecular structure, is used at optimized dosages and temperatures to achieve high brightness and stability, offering a higher retention rate and cost-effectiveness by avoiding yellowing and plateauing in brightness gain, even at higher dosages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optical brightener agents (OBA) or fluorescent whitening agents (FWA) are used to achieve ultra-bright paper products, then brightness is improved, but yellowing occurs due to overdosage and low retention rates
Solution Approach 1:
The patent changes the chemical structure parameters of the fluorescent whitening agent by introducing a morpholino group at the 6-position of the triazin ring in FB #71. This structural modification alters the agent's properties to prevent yellowing while maintaining high brightness, resolving the contradiction between achieving ultra-bright paper and avoiding yellowing effects
Solution Approach 2:
The patent employs FB #71 which provides high brightness gain without the long-term yellowing issues associated with conventional OBAs and FWA's. The agent delivers its brightening effect efficiently without persistent harmful residues, addressing the retention rate and yellowing problems
2Illumination intensity
If higher dosages of conventional FWA are added to increase brightness, then brightness gain is improved, but cost increases and yellowing occurs
Solution Approach 1:
The patent modifies the chemical structure of FWA by adding a morpholino group, which changes the agent's efficiency characteristics. This allows FB #71 to achieve higher brightness gain per unit dosage compared to conventional FWA's, reducing the total quantity needed while avoiding yellowing
Solution Approach 2:
The patent uses FB #71 which combines the beneficial properties of high brightness capability with the yellowing-prevention feature. This composite chemical structure achieves superior performance at lower dosages, resolving the contradiction between brightness gain and dosage quantity
3Illumination intensity
If conventional OBA/FWA is used to achieve high brightness, then brightness is improved, but retention rate is low
Solution Approach 1:
The patent changes the chemical parameters of the brightening agent by incorporating a morpholino group, which improves the agent's performance characteristics. This structural modification enhances brightness delivery while preventing the low retention and yellowing issues associated with conventional agents
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
FB #71 enables the production of high-brightness paper with increased retention rates and lower costs, preventing yellowing and maintaining brightness without the need for excessive addition, thereby expanding market applications and reducing brightness reversion.
Implementation Method 1
OBA's or FWA's have chemical properties that absorb light in the ultra-violet region (340-370 nm) and then re-emitting it back into the visible spectrum, usually in the color blue or indigo (420-470 nm). The absorption and re-emission happen at a rapid pace unlike the slow phosphorescence behaviour.
Data Source
AI summary
Fluorescent whitening agent 71 (FB #71) 4,4′-bis[4-anilino-6-morpholino-1,3,5-triazin-2-yl]amino-2,2′-stilbene disodium salt (CAS #16090-02-1) is used on the wet-end papermaking process and coating papermaking process to increase the brightness of paper.