Polysaccharide Coating Films for Surface Sealing and Preservation
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Solution Overview
Problem
Current technologies for sealing and preserving surfaces, such as arable land and wooden structures, face limitations in mechanical stability, biodegradability, and environmental impact, with existing films being costly, having limited mechanical properties, and requiring high manual effort for application, especially on complex geometries.
Innovation Solution
Development of liquid-applicable multifunctional films based on polysaccharide materials and water-soluble derivatives with crosslinkers and polyol spacers, allowing for acetalic or ketalic crosslinking to create stable, flexible, and biodegradable films that maintain mechanical properties and can be applied efficiently on various surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyolefin, PET, PA, and PVC films are used for sealing and waterproofing surfaces, then waterproofing and sealing performance are improved, but manual effort required for covering or removing films increases significantly
Solution Approach 1:
The patent changes the physical state parameter from solid pre-formed films to liquid coating composition that can be sprayed or brushed, enabling easy application on complex geometries while maintaining waterproofing performance through controlled film formation upon drying
Solution Approach 2:
The patent replaces mechanical film laying and removal operations with liquid application methods (spraying or brushing), eliminating the need for manual handling of large film sheets and reducing labor intensity while achieving equivalent sealing performance
2Ease of operation
If plastic dispersions based on synthetic polymers are used for liquid-applicable coatings, then ease of application is improved, but mechanical properties and biodegradability are limited
Solution Approach 1:
The patent uses composite material systems combining cellulose derivatives (providing mechanical strength and biodegradability) with synthetic polymer components (providing ease of application and film formation), achieving both good applyability and enhanced mechanical properties while maintaining biodegradability
Solution Approach 2:
The patent modifies the chemical composition parameters of the dispersion system by incorporating cellulose derivatives with specific molecular weights and degrees of substitution, enabling tuning of mechanical properties while maintaining liquid applicability and biodegradability
3Reliability
If surface coatings with low water vapor permeability are applied to sealed wood, then waterproofing is improved, but biocidal treatment effectiveness and environmental protection are compromised
Solution Approach 1:
The patent optimizes the water vapor permeability parameter of the coating to achieve a balanced state that provides sufficient waterproofing while allowing controlled moisture exchange, creating conditions favorable for biocidal treatment effectiveness and environmental compatibility without compromising sealing performance
4Ease of manufacture
If crosslinkable cellulose additives are used in latex coatings, then thickening and crosslinking performance are improved, but application versatility and film stability are limited
Solution Approach 1:
The patent develops cellulose derivative compositions that simultaneously provide thickening, crosslinking, and film-forming functions, enabling universal application across different coating systems and substrates while maintaining processability and achieving enhanced mechanical properties through controlled crosslinking
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 films provide enhanced mechanical stability, controlled moisture retention, and biodegradability, with adjustable service life and adhesion to surfaces, enabling efficient sealing and preservation while minimizing environmental impact and reducing manual application effort.
Implementation Method 1
by reacting polysaccharide materials, and/or water-soluble polysaccharide derivatives and polyolic spacers with crosslinkers possessing one or more carbonyl and/or carboxyl functions, it is possible to form mechanically stable and more or less flexible films
Implementation Method 2
allowing for acetalic or ketalic crosslinking to create stable, flexible, and biodegradable films
Implementation Method 3
The film formation from the applied dispersion layer is primarily based on the physical-mechanical bonding of the plastic particles during the evaporation of the solvent/dispersant
Data Source
AI summary
The present invention relates to multifunctional coating films that can be applied in liquid form for compressing, sealing, covering and preserving surfaces. The films comprise a composition of polysaccharide materials and/or homo- or heteroglycan water-soluble polysaccharide derivatives, polyol spacers, and crosslinkers with one or more carbonyl or carboxylic functions. At the time of application, the composition is water-soluble and reactive, but after hardening it is capable of absorbing water or swelling, impermeable to water vapour, stable against water and UV and can be biologically degraded in a controlled manner. By reacting polysaccharide materials, polysaccharide derivatives and polyol spacers with cross linkers having one or more carbonyl or carboxylic functions, mechanically stable flexible films are obtained, which retain their mechanical properties up to a foreign material content of 80%. The films can swell in a controlled manner and can bind up to 75% water relative to their dry weight, corresponding to the degree of crosslinking and the spacer that is used.