Optical Brightening Agent Composition for Paper
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Solution Overview
Problem
Current optical brightening agents based on triazine-stilbenes in the papermaking industry have limited brightness effects, leading to suboptimal performance in enhancing the brightness of paper and cardboard products.
Innovation Solution
A composition combining triazine-stilbenes as optical brightening agents with sodium methylene dinaphthalene sulfonates as dispersing agents, mixed with water, is applied to pulp suspensions to enhance the optical brightening effect, with specific weight percentage ratios optimizing the brightness and whiteness of paper and cardboard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If triazine-stilbenes are used as optical brightening agents, then brightness enhancement is achieved, but the brightness effect is limited
Solution Approach 1:
The patent combines triazine-stilbenes optical brightening agents with sodium methylene dinaphthalene sulfonates dispersing agents to form a composite composition. This composite approach allows the dispersing agent to enhance the distribution and effectiveness of the brightening agent, thereby improving the overall brightness effect beyond what triazine-stilbenes can achieve alone.
Solution Approach 2:
Sodium methylene dinaphthalene sulfonates acts as an intermediary dispersing agent that facilitates the uniform distribution of triazine-stilbenes in the pulp suspension. This intermediary substance enhances the interaction between the brightening agent and the paper substrate, improving the effectiveness of brightness enhancement.
2Illumination intensity
If optical brightening agent composition is added to pulp suspension, then GE Brightness and CIE Whiteness are significantly improved, but composition complexity increases
Solution Approach 1:
The patent merges the optical brightening function of triazine-stilbenes with the dispersing function of sodium methylene dinaphthalene sulfonates into a single integrated composition. This combining approach achieves multiple functions (brightening and dispersing) simultaneously, improving GE Brightness and CIE Whiteness while avoiding the need for separate addition steps that would increase process complexity.
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
The composition significantly improves the Geometric Brightness (GE Brightness) and CIE Whiteness of paper and cardboard products, outperforming control groups without dispersing agents, demonstrating enhanced optical brightening capabilities.
Implementation Method 1
optical brightening agents (OBA) into pulp for better brightness of manufactured paper or cardboards by optic functions of optical brightening agents
Implementation Method 2
an optical brightening agent composition consisting of an optical brightening agent, a dispersing agent and water wherein the optical brightening agent and the dispersing agent are triazine-stilbenes and sodium methylene dinaphthalene sulfonates, respectively
Data Source
AI summary
An optical brightening agent composition having an optical brightening agent, a dispersing agent and water. The optical brightening agent and the dispersing agent are triazine-stilbenes and methylene dinaphthalene sulfonates, respectively. Applications of an optical brightening agent composition for optically brightening paper or cardboards, optically brightening surfaces of paper or cardboards, and coating or adhesively pressing an optical brightening agent composition on paper or cardboards, are also provided.