Aqueous Seed Coating Composition with Polyvinyl Alcohol Copolymer
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Solution Overview
Problem
Existing seed coating compositions face challenges with excessive dusting, bulk seed clumping, and reduced germination efficiency due to issues with polymeric binders, which affect seed flowability and plantability, while also requiring improvements in storage stability and pest resistance.
Innovation Solution
Aqueous seed coating compositions utilizing specific polyvinyl alcohol copolymers, selected from hydrolyzed copolymers of vinyl acetate and ethylene or unsaturated acids, combined with hydrophobic pesticides, providing a balance of low dust-off properties, improved flowability, and enhanced germination characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If polymeric binders are added to reduce dust-off, then dust-off is reduced, but seed flowability deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the degree of polymerization (specifically keeping it below 1,000) and the molecular weight of the polymeric binder to optimize the balance between dust-off reduction and seed flowability. This parameter optimization ensures the coating provides sufficient adhesion while maintaining free-flowing characteristics during storage and planting operations.
Solution Approach 2:
The patent uses composite materials by combining the polymeric binder with specific additives including hydrophobic agents, surfactants, and optional components in a formulated coating composition. This composite approach allows the system to achieve both low dust-off properties and good flowability through synergistic interactions between components.
2Object-generated harmful factors
If coating ingredients are added to increase stickiness and reduce dust-off, then dust-off is reduced, but seed flowability and plantability characteristics deteriorate
Solution Approach 1:
The patent optimizes the concentration and molecular characteristics of the polymeric binder, specifically limiting the degree of polymerization to below 1,000, to achieve sufficient coating adhesion without excessive stickiness that would impair flowability and plantability during mechanical planting operations.
Solution Approach 2:
The patent applies local quality by ensuring the coating provides adequate stickiness only where needed for dust-off prevention, while maintaining overall free-flowing properties through controlled polymer characteristics and balanced formulation with hydrophobic additives and surfactants.
3Ease of manufacture
If polymeric binders with inadequate hydrophobicity are used, then coating cost is reduced, but seed agglomeration increases under warm humid conditions
Solution Approach 1:
The patent employs composite materials by formulating the coating with hydrophobic additives and surfactants in combination with the polymeric binder. This composite formulation provides the necessary hydrophobicity to prevent seed agglomeration during storage in warm, humid conditions while maintaining cost-effectiveness through efficient use of each component.
Solution Approach 2:
The patent uses hydrophobic additives and surfactants as intermediaries that enhance the hydrophobic character of the coating formulation, enabling the polymeric binder to provide adequate adhesion while the hydrophobic components prevent excessive moisture absorption and seed sticking during storage.
4Device complexity
If conventional polymeric binders are used, then coating formulation is simplified, but coated seed storage stability and germination characteristics deteriorate
Solution Approach 1:
The patent applies parameter changes by specifying optimal ranges for the degree of polymerization (below 1,000) and molecular weight of the polymeric binder, along with controlled levels of hydrophobic additives and surfactants. These parameter optimizations ensure the coating maintains seed storage stability and germination characteristics without requiring complex formulation approaches.
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 described composition achieves reduced dust-off, improved seed flowability, and maintained or enhanced germination rates, along with storage stability, while preventing seed agglomeration and enhancing plantability.
Implementation Method 1
a polyvinyl alcohol polymer binder... forms a matrix for the various functional additives upon drying after application, as well as a protective film for covering the seed
Implementation Method 2
the factors which increase seed flowability characteristics of the coating have negative impact on dust-off properties. For planting seeds mechanically, it is essential that the seeds do not agglomerate. Seeds coated with polymeric binders that have inadequate hydrophobicity will stick together, particularly when exposed to warm, humid air
Data Source
AI summary
The present invention relates generally to an aqueous seed coating composition based on a specific polyvinyl alcohol copolymer resin as a binder plus a hydrophobic pesticide additive, and seeds coated with such coating composition, which coated seeds have a desirable combination of bulk low dusting, bulk seed flowability and good germination characteristics.