Transesterified Antifogging Agents for Plastics
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Solution Overview
Problem
Existing antifogging agents for plastics are either not long-lasting, lack compatibility with food products, and pose ecological and economic concerns, particularly in the food industry, as they can be washed off or affect transparency and processing properties.
Innovation Solution
The development of antifogging agents produced through the transesterification of native oils with polyethylene glycols (PEG) or mixtures of PEG and other polyols, which are incorporated into the polymer matrix of plastics, providing a long-lasting, food-compatible, and ecologically friendly solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If external antifogging agents are applied as a coating to the plastic surface, then antifogging effect is achieved instantly, but the effect is not long-lasting because they can be washed off or removed
Solution Approach 1:
The patent uses silane compounds as intermediaries that first form a coating on the plastic surface, then undergo hydrolysis and condensation to create a permanent chemical bond. This two-stage process allows the antifogging agent to be initially applied easily as a coating, then transformed into a durable cross-linked structure that cannot be washed off, thus resolving the contradiction between ease of application and long-lasting effect
Solution Approach 2:
The patent changes the chemical state of the antifogging agent through controlled hydrolysis and condensation reactions. The silane compounds transition from a soluble, easily applied liquid state to an insoluble, cross-linked solid state that forms a permanent bond with the plastic surface. This parameter change from physical coating to chemical bonding resolves the contradiction between application ease and durability
2Duration of action of moving object
If internal antifogging agents are incorporated in the polymer matrix of the plastic, then long-term effect is achieved, but stringent compatibility requirements must be met including food compatibility, heat stability, and transparency maintenance
Solution Approach 1:
The silane compounds act as intermediaries that can be incorporated into the polymer matrix during processing. They remain stable during plastic processing temperatures, then activate upon exposure to moisture to form the antifogging layer. This intermediary behavior allows the agent to meet processing compatibility requirements while still achieving long-term antifogging effect
Solution Approach 2:
The patent utilizes parameter changes in the silane compounds' chemical state - they are stable at high processing temperatures, then undergo hydrolysis and condensation at lower temperatures upon moisture exposure. This parameter change allows compatibility with diverse plastic processing conditions while maintaining long-term effectiveness
3Illumination intensity
If plastics have high interfacial tension towards water, then water-repellent properties are maintained, but water deposits as droplets forming fog that obscures visibility
Solution Approach 1:
The silane-based antifogging coating changes the surface energy parameters of the plastic, reducing interfacial tension with water. This parameter change causes water to spread as a uniform film rather than forming droplets, eliminating fog formation while maintaining transparency and visibility
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 resulting antifogging agents effectively reduce surface tension, preventing fog formation and maintaining transparency, printing, and sealing properties while being economically viable and safe for food packaging applications.
Implementation Method 1
it is desirable to reduce the surface tension of the plastics towards water which is done by hydrophilicizing the plastics
Implementation Method 2
antifogging agents for plastics which are obtainable by transesterification of native oils with polyethylene glycols (PEG) or mixtures of PEG and other polyols
Implementation Method 3
Antifogging agents produce transparent layers on the packaging films by preventing the formation of water droplets on the plastic surface in the event of the condensation of water
Data Source
AI summary
The invention relates to antifogging agents for plastics which are obtainable by transesterification of native oils with PEG or mixtures of PEG and other polyols, to plastics containing these antifogging agents and to the use of mixtures obtainable by transesterification of native oils with PEG or mixtures of PEG and other polyols as antifogging agents in plastics.