Surface-Modified Silicon Dioxide Matting Agents for UV Varnishes
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Solution Overview
Problem
UV varnishes face challenges in matting due to shrinkage during curing, which prevents the matting agents from developing their intended effect, and existing silicon dioxide-based matting agents often cause clouding and sedimentation issues in clear coats.
Innovation Solution
Surface-modified silicon dioxides coated with organopolysiloxanes containing multiple bonds are used as matting agents in UV varnishes, providing improved transparency and sedimentation properties compared to traditional PE wax-coated silicon dioxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional matting agents (PE wax-coated silicon dioxide) are used in UV coatings, then matting effect is achieved, but transparency is reduced and clouding occurs in liquid form
Solution Approach 1:
The patent changes the chemical composition parameter of the coating material by replacing PE wax with organopolysiloxanes containing multiple bonds. This parameter change allows the matting agent to maintain its matting effect while improving transparency, as the polysiloxane-based coating does not cause the same clouding effect as PE wax in liquid form.
Solution Approach 2:
The patent creates a composite material system combining silicon dioxide particles with organopolysiloxane coatings. This composite approach integrates the matting properties of silicon dioxide with the optical clarity of polysiloxane, achieving both matting effect and improved transparency simultaneously.
2Shape
If silicon dioxide particles are used as matting agents, then matting effect is achieved, but sedimentation issues occur in clear coats
Solution Approach 1:
The organopolysiloxane acts as an intermediary substance between the silicon dioxide particles and the UV coating matrix. This intermediary coating improves the compatibility and dispersion of silicon dioxide particles in the clear coat, preventing sedimentation while maintaining the matting effect.
Solution Approach 2:
The patent modifies the surface properties parameter of silicon dioxide particles through organopolysiloxane coating. This parameter change in surface chemistry improves the particles' stability within the clear coat formulation, preventing sedimentation while preserving matting effectiveness.
3Strength
If UV coatings are cured, then coating hardens, but shrinkage prevents matting agents from exerting their effect
Solution Approach 1:
The patent applies the matting agent modification in advance, before coating application. By pre-coating silicon dioxide particles with organopolysiloxanes containing multiple bonds, the matting effect is established before the coating is applied and cured, allowing the matting particles to function effectively even after UV curing and shrinkage occur.
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 surface-modified silicon dioxides enhance the matting effect, maintain transparency in liquid form, and improve sedimentation properties, resulting in clearer and more effective UV-curing clear varnishes with enhanced application properties.
Implementation Method 1
surface-modified silicon dioxides whose surface has been modified by treatment with a multi-bond-containing organopolysiloxane
Implementation Method 2
UV-curing clearcoats
Data Source
AI summary
The invention relates to matted UV varnishes comprising silicon dioxide, the surface thereof having been modified by means of treatment with a multiple bond organopolysiloxane so as to be particularly well-suited for use as a matting material for UV varnishes, and to a method for producing same.