Microencapsulated Pendimethalin ZC Formulation Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pendimethalin, a dinitroaniline herbicide, is notoriously incompatible with several herbicides, leading to unstable formulations, staining issues, and inefficiencies in weed control, particularly when combined with certain active compounds like Metribuzin 75% DF, resulting in flocculation and loss of physicochemical properties.
Innovation Solution
A ZC formulation comprising microencapsulated pendimethalin within a polyurea polymeric wall, combined with a suspension concentrate of selected herbicides such as sulfonylurea, triazinone, or imidazolinone herbicides, stabilized by an alkali or alkaline earth metal salt of an organic acid, forming a stable and non-staining suspension that improves the compatibility and shelf life of the herbicides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pendimethalin is combined with certain herbicides (e.g., Metribuzin) in conventional formulations, then broad-spectrum weed control is achieved, but the formulation becomes unstable with flocculation and loss of physicochemical properties
Solution Approach 1:
The formulation is segmented into distinct functional components: microencapsulated pendimethalin particles, suspension concentrate of other herbicides, and specific dispersing/suspending agents. This segmentation allows each component to perform its function independently, preventing incompatibility reactions while maintaining broad-spectrum control.
Solution Approach 2:
Specific dispersing and suspending agents act as intermediaries between pendimethalin and other herbicides. These agents prevent direct interaction that would cause flocculation, mediating the relationship between incompatible substances to maintain formulation stability.
2Productivity
If pendimethalin is formulated with incompatible herbicides, then enhanced herbicidal activity is achieved, but staining of plants and commodities occurs
Solution Approach 1:
Pendimethalin is enclosed in microcapsules with polymeric shells that act as flexible barriers. These shells prevent direct contact between pendimethalin and plant/commodity surfaces, eliminating staining while allowing controlled release for herbicidal activity.
Solution Approach 2:
The microcapsules provide localized protection where pendimethalin is confined within the capsule structure. This local quality control ensures that the active ingredient remains isolated from surfaces it would otherwise stain, while maintaining its herbicidal function when released.
3Stability of the object's composition
If tank-mixing is used to combine herbicides, then formulation stability is maintained, but dosing precision is lost leading to overdose
Solution Approach 1:
Multiple herbicides are merged into a single pre-formulated ZC product with precisely defined ratios. This combines the stability of separate formulations with the precision of pre-measured combinations, eliminating dosing errors while maintaining compatibility through proper formulation design.
Solution Approach 2:
The formulation parameters (concentrations, ratios, pH, ionic strength) are precisely controlled and standardized in the ZC product. This parameter control ensures consistent, precise dosing while maintaining formulation stability through optimized chemical and physical conditions.
4Stability of the object's composition
If microencapsulation is used for pendimethalin, then compatibility and stability are improved, but formulation complexity increases
Solution Approach 1:
Microencapsulation uses thin polymeric shells to protect pendimethalin, providing compatibility and stability while adding minimal structural complexity. The shell structure is simple yet effective, enclosing the active ingredient without requiring complex formulation systems.
Solution Approach 2:
The formulation uses composite materials combining pendimethalin with specific dispersing agents, suspending agents, and polymeric capsule walls. These composite materials work synergistically to provide stability and compatibility while maintaining relatively simple formulation architecture.
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 ZC formulation enhances the physicochemical stability of incompatible herbicides, preventing degradation and flocculation, maintaining efficacy over time, and reducing staining, thereby providing a broad-spectrum weed control with improved stability and reduced application rates.
Implementation Method 1
microencapsulated pendimethalin within a polyurea polymeric wall
Implementation Method 2
ZC formulations are a combination of capsule suspension and suspension concentrate such that the formulation contains a stable aqueous suspension of microcapsules and solid fine particles
Implementation Method 3
stabilized by an alkali or alkaline earth metal salt of an organic acid
Data Source
AI summary
The present invention relates to herbicidal compositions for controlling undesirable plant species. A herbicidally effective amount of a ZC formulation comprising microencapsulated pendimethalin and a co-herbicide present in the form of a suspension concentrate is disclosed. The present invention also relates to methods for controlling undesirable plant species comprising applying the herbicidal compositions to the foliage of the plants or to the soil or water containing seeds or other propagating organs thereof.