Aqueous Polyurethane Seed Coating Reduces Dust
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Solution Overview
Problem
Vacuum seed planters generate significant seed dust during planting, which includes active ingredients like insecticides and fungicides, leading to undesirable loss and reduced effectiveness.
Innovation Solution
Aqueous polyurethane dispersion-based seed treatment compositions that form a film with specific properties (microhardness ≤15 N/mm², Tg between -54°C and -4°C, percent elongation of 44 to 820, and tensile strength of 130 to 900 lb/in²) are used to reduce seed dust emission during planting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a polymer binder is included with the active ingredients in the treatment of seeds, then the amount of dust generated during planting is reduced, but a certain amount of dust is still generated even when seeds are treated with polyolefin binder
Solution Approach 1:
The patent changes the chemical and physical parameters of the polymer binder from traditional polyolefin to polyacrylonitrile-based polymer with specific properties (glass transition temperature of -50°C to 0°C, specific microhardness and tensile strength). This parameter change enables the coating to maintain flexibility at planting temperature while providing sufficient binding strength, thereby significantly reducing dust generation during vacuum planting while retaining active ingredients effectively.
Solution Approach 2:
The patent uses a composite coating formulation comprising polyacrylonitrile-based polymer as the primary binder, combined with specific additives and active ingredients. This composite material approach creates a synergistic effect where the polyacrylonitrile polymer provides superior dust reduction properties compared to single-component polyolefin binders, while the composite structure ensures both dust reduction and active ingredient retention.
2Productivity
If vacuum planters are used to plant seeds, then planting efficiency is improved, but significant seed dust is generated during the planting process
Solution Approach 1:
The patent modifies the physical parameters of the seed coating by using polyacrylonitrile-based polymer with specific glass transition temperature (-50°C to 0°C) and mechanical properties. This enables the coating to remain flexible during vacuum planting operations, preventing dust generation while maintaining the planting efficiency benefits of vacuum planter use.
Solution Approach 2:
The patent converts the potential harm of dust generation during vacuum planting into a benefit by using the vacuum force itself to press the polyacrylonitrile-based coating onto the seed surface more effectively. The vacuum planting process that would normally cause dust generation instead enhances coating adhesion, and the specialized polymer properties ensure no dust is released during this process.
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
Significantly reduces seed dust generation during vacuum planting compared to compositions using polyolefin latex or no polymeric component, enhancing the retention and effectiveness of active ingredients.
Implementation Method 1
a polymer binder is included with the active ingredients in the treatment of seeds to bind the active ingredient to the seed
Implementation Method 2
The planter draws a vacuum on the side of the plate opposite the container in which the seeds are stored. When the plate rotates through the storage container, atmospheric pressure holds seeds against the holes
Data Source
AI summary
Disclosed are seed treatment compositions that include: (a) an aqueous polyurethane dispersion; and (b) an insecticide, a fungicide, a nematicide, and/or other pesticides. Also disclosed are seeds treated with such a treatment compositions and methods for treating a seed using such treatment composition.