Polysiloxane Modified Titanium Dioxide Dispersion
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Solution Overview
Problem
Current treatments for titanium dioxide, such as those using silicon-containing compounds, often face challenges with reactivity, volatility of byproducts, and environmental issues, necessitating a need for improved dispersion and processability in pigment production.
Innovation Solution
Treating titanium dioxide with a polysiloxane where one or more silicon atoms are substituted with an alkylene group terminated with silyl groups like hydroxy, halo, or alkoxy, enhancing reactivity and reducing environmental concerns, and blending the treated particles with organic polymers for improved dispersion and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halosilanes are used in aqueous media to improve reactivity, then reactivity with titanium dioxide is improved, but process complexity and cost increase
Solution Approach 1:
The patent changes the chemical parameters of the silane compound by selecting specific alkyl groups and hydrolyzable groups (methoxy, ethoxy, propoxy) to achieve adequate reactivity without requiring the more complex halosilane chemistry. This parameter optimization allows the use of simpler aqueous or organic media processes while maintaining effective coating formation on titanium dioxide.
2Reliability
If alkoxy groups are used to improve reactivity, then reactivity with titanium dioxide is improved, but environmental issues arise due to alcohol byproduct generation
Solution Approach 1:
The patent extracts or removes the problematic alcohol byproduct generation pathway by selecting silane compounds with specific hydrolyzable groups that produce less environmentally concerning byproducts. The use of methoxy, ethoxy, or propoxy groups redirects the byproduct formation away from problematic alcohols, thereby reducing environmental issues while maintaining reactivity.
3Stability of the object's composition
If dispersing agents are added to improve dispersion, then dispersion of titanium dioxide is improved, but compatibility with other additives and performance properties may be compromised
Solution Approach 1:
The patent merges the dispersion function and the coating function into a single polysiloxane treatment layer on the titanium dioxide surface. This combined approach eliminates the need for separate dispersing agents, thereby improving dispersion while maintaining compatibility with other additives in the matrix, as the siloxane coating itself provides the dispersion benefits without introducing additional compatibility conflicts.
4Stability of the object's composition
If silicon-containing compounds are used to treat titanium dioxide, then dispersion is improved, but volatility of byproducts and environmental concerns arise
Solution Approach 1:
The patent changes the physical and chemical parameters of the silicon-containing compound by selecting polysiloxanes with specific molecular weights and structural configurations. This parameter selection reduces the volatility of the treatment compounds and their byproducts, thereby maintaining dispersion improvements while reducing environmental concerns related to volatility.
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 approach results in excellent dispersion, low volatility, and excellent temperature stability of titanium dioxide in organic polymer blends, addressing the limitations of existing treatments and providing improved performance in pigmentary and photocatalytic applications.
Implementation Method 1
One or more silicon atoms of the polysiloxane are substituted with an alkylene group that is terminated with a silyl group containing three substituents selected from the group consisting of hydroxy, halo, alkoxy, acetoxy, and mixtures thereof
Data Source
AI summary
A particle of titanium dioxide treated with a polysiloxane is dislcosed. One or more silicon atoms of the polysiloxane are substituted with an alkylene group that is terminated with a silyl group containing three substituents selected from the group consisting of hydroxy, halo, alkoxy, acetoxy, and mixtures thereof. These treated particles are blended with organic polymers.