Herbicide Granules with Built-in Adjuvant Stabilization
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Solution Overview
Problem
Current herbicide granule formulations for flooded paddy rice applications have limited built-in adjuvant content, which restricts their biological performance and weed control efficacy.
Innovation Solution
Developing stable herbicide granules and powders with higher loadings of built-in adjuvants, including plant-derived oils and esters, combined with solid carbohydrates and water-soluble polymers like lignosulfonates, to enhance herbicidal efficacy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher loadings of built-in adjuvant are used in herbicide granules, then weed control efficacy is improved, but formulation stability deteriorates
Solution Approach 1:
The patent uses solid carbohydrates and water-soluble polymers as intermediary substances to stabilize the liquid adjuvant within the granule matrix. These stabilizers act as mediators between the liquid adjuvant and the granule structure, preventing phase separation and maintaining formulation integrity while allowing high adjuvant loading (200-600 g/kg).
Solution Approach 2:
The invention creates a composite granule formulation combining multiple components: herbicide active ingredient, liquid adjuvant (plant-derived oil or ester), solid carbohydrate, and water-soluble polymer. This composite structure allows the liquid adjuvant to be embedded within a solid matrix, providing both high adjuvant content and formulation stability.
2Quantity of substance
If liquid adjuvant is incorporated into solid granules, then herbicidal delivery is improved, but physical stability deteriorates due to Ostwald Ripening
Solution Approach 1:
The patent converts the potentially harmful effect of liquid adjuvant instability (Ostwald Ripening) into a beneficial controlled release mechanism. By carefully selecting stabilizers and formulation conditions, the gradual phase change is controlled to maintain adjuvant availability while preventing unwanted liquid droplet coalescence and separation.
Solution Approach 2:
Solid carbohydrates and water-soluble polymers serve as intermediary substances that interact with the liquid adjuvant to prevent Ostwald Ripening. These intermediaries form a stable matrix that holds the liquid adjuvant in place, preventing migration and coalescence of liquid phases within the granule structure.
Data Source
AI summary
The present invention concerns stable herbicidal solid compositions containing built-in adjuvant which exhibit improved herbicidal efficacy when used to control weeds in flooded rice paddies or fields.