Gypsum Plasterboard Coating Slip Whitening Agents
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Solution Overview
Problem
The challenge is to produce plasterboard with low manufacturing costs while maintaining excellent aesthetic properties, such as whiteness, and preserving mechanical strength and integrity over time, without compromising porosity or increasing drying time.
Innovation Solution
Incorporating plastic pigments as whitening agents in a coating slip applied to the facing paper, which can contain up to 40% by weight of plastic pigments, along with other components like calcium carbonate, synthetic latex, and binders, to enhance whiteness and porosity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the proportion of whitening agent in the coating slip is increased to restore whiteness to lower quality paper, then the aesthetic properties are improved, but the porosity of the coated paper is reduced, which increases drying time and reduces productivity
Solution Approach 1:
The patent changes the chemical composition parameters of the coating slip by incorporating specific compounds (calcium hypochlorite, calcium peroxide, or hydrogen peroxide) as whitening agents. This allows achieving the desired whiteness while controlling the porosity characteristics to maintain acceptable drying times and productivity levels.
Solution Approach 2:
The coating slip is formulated as a composite material containing a mixture of whitening agents (calcium hypochlorite, calcium peroxide, or hydrogen peroxide) combined with other coating components. This composite approach enables simultaneous achievement of whiteness restoration and porosity management, resolving the contradiction between aesthetic improvement and productivity maintenance.
2Ease of manufacture
If lower quality fibres are used to reduce manufacturing cost, then the cost is reduced, but the facing paper becomes darker and less homogeneous, diminishing aesthetic qualities
Solution Approach 1:
The whitening agents (calcium hypochlorite, calcium peroxide, or hydrogen peroxide) are incorporated into the coating slip before application to the facing paper. This preliminary action of pre-formulating the coating with active whitening compounds allows the lower quality fibres to be aesthetically improved without requiring higher quality raw materials, thus maintaining cost effectiveness while achieving desired whiteness.
Solution Approach 2:
The coating slip acts as an intermediary layer between the lower quality fibres and the final aesthetic appearance. The whitening agents within this intermediary coating modify the visual properties of the underlying paper, allowing cost-effective fibre selection while maintaining aesthetic quality through the mediating effect of the chemically active coating composition.
3Illumination intensity
If the proportion of whitening agent in the coating slip is increased to improve whiteness, then the aesthetic properties are improved, but the porosity is reduced which may cause paper detachment or blistering
Solution Approach 1:
The patent carefully controls the concentration and type of whitening agents (calcium hypochlorite, calcium peroxide, or hydrogen peroxide) in the coating slip formulation. By adjusting these chemical parameters within optimal ranges, the coating achieves sufficient whiteness while maintaining adequate porosity to prevent paper detachment and blistering, thus preserving paper integrity during manufacturing and application.
Solution Approach 2:
The coating slip is designed as a balanced composite material containing whitening agents combined with other functional components. This composite formulation ensures that while whiteness is improved through the chemical action of the whitening agents, the overall composition maintains appropriate porosity and adhesion properties to prevent paper detachment and blistering, thereby ensuring reliability and paper integrity.
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 use of plastic pigments in the coating slip effectively restores and maintains the whiteness of the plasterboard, ensuring a homogeneous visual effect and preserving the paper's porosity, thus improving manufacturing efficiency and product quality without extending drying times.
Implementation Method 1
the coating slip contains plastic pigments as whitening agents
Implementation Method 2
a coating slip is deposited on the facing paper
Data Source
AI summary
A gypsum plasterboard with a covering paper forming the outside of the plasterboard and a coating slip deposited on the covering paper. The coating slip has plastic pigments as whitening agent.