Granular Agrochemical Formulation with Ester Coating
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Solution Overview
Problem
Formulating stable solid granular formulations of low melting agrochemicals is challenging due to issues with attrition resistance, rapid dispersibility, and chemical inertness, as existing methods often result in formulations with low suspensibility and stability.
Innovation Solution
A process involving melting low melting agrochemicals, sorbing them onto an absorbent, mixing with a co-agrochemical and adjuvant, and partially surface-coating with esters such as alkyl or aryl alkoxylates before wet mixing to enhance dispersibility and suspensibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the amount of dispersing agent is increased to improve attrition resistance, then the granule strength is improved, but the dissolving time increases
Solution Approach 1:
The patent changes the chemical composition parameters of the dispersing agent system by introducing a specific synergistic combination of polyacrylamide (0.1-5% w/w) and starch phosphate (0.1-5% w/w). This parameter change allows achieving the desired granule strength with lower overall dispersing agent content, thus maintaining rapid dissolving time while improving attrition resistance.
Solution Approach 2:
The patent uses a composite dispersing agent system combining polyacrylamide and starch phosphate in specific ratios. This composite approach creates synergistic effects where the combination provides superior granule binding strength compared to individual dispersing agents, enabling reduced total dispersing agent content while maintaining or improving granule integrity and reducing dissolving time.
2Stability of the object's composition
If a carrier material is selected for chemical inertness, then the stability of agrochemical is improved, but the compatibility with both agrochemicals in combination becomes difficult to achieve
Solution Approach 1:
The patent introduces a coating layer comprising the dispersing agent combination (polyacrylamide and starch phosphate) as an intermediary between the carrier material and the agrochemicals. This coating layer acts as a protective barrier that prevents direct interaction between the carrier and agrochemicals, thereby maintaining agrochemical stability while allowing the use of carriers with appropriate physical properties for granule formation and flow.
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 process produces granular formulations with improved attrition resistance, rapid dispersibility, and stability, allowing for effective control of weeds and pests without damaging crops.
Implementation Method 1
melting an agrochemically effective amount of a low melting agrochemical and sorbing molten low melting agrochemical on an absorbent to obtain particles of said low melting agrochemical
Implementation Method 2
spray coating the particles with an ester prior to wet mixing, to give at least partially surface coating said particles of low melting agrochemical and the particles of co-agrochemical
Data Source
AI summary
A granular formulation comprising particles of at least one low melting agrochemical wherein said particles of low melting agrochemical are at least partially surface coated with an ester of a compound selected from the group comprising (a) an alkyl or aryl alkoxylate, (b) alkoxylates of fatty alcohol, (c) alkoxylates of fatty acids, (d) block co¬ polymers of alkyls, or ethylene oxides or propylene oxides, (e) polyaryl substituted aliphatic or aromatic alkoxylate, (f) alkoxylated polyaryl substituted phenol and their derivative and/or mixtures thereof; and a composition and kit-of-parts comprising the same.