Cellulosic Carrier Phosphite Salts Slow Release
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Solution Overview
Problem
Current slow-release formulations of phosphite salts for agricultural use have limited efficacy, with rapid release profiles and lack of sustained action, necessitating the development of a formulation that provides a controlled and prolonged release of phosphorous acid and its salts to effectively act as fungicides and fertilizers.
Innovation Solution
A slow-release agrochemical composition is created using an absorbent cellulosic carrier with a metal-containing compound, such as calcium carbonate, to bind phosphorous acid and monovalent phosphite salts, achieving a controlled release profile through the use of cellulosic granules or paper strips, allowing for a prolonged supply of phosphites to plants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If phosphite salts are formulated in aqueous solutions for rapid delivery, then water solubility and absorption efficiency are improved, but release duration is too short requiring frequent applications
Solution Approach 1:
The patent employs porous polymeric beads as a carrier material to formulate phosphite salts. The porous structure provides high surface area and porosity for loading phosphite salts, while the polymer matrix controls the release rate through diffusion and erosion mechanisms, extending release duration from hours to days while maintaining adequate solubility for plant absorption
Solution Approach 2:
The patent creates composite formulations by combining phosphite salts with porous polymeric bead carriers. This composite approach integrates the water solubility and fungicidal activity of phosphite salts with the controlled release properties of the polymeric matrix, achieving both rapid initial availability and prolonged sustained release
2Duration of action of moving object
If phosphite salts are bound to cellulosic carriers for slow release, then release duration is extended, but release rate becomes too slow reducing efficacy
Solution Approach 1:
The patent modifies the physical and chemical parameters of the carrier system by using porous polymeric beads with controlled pore size, surface area, and erosion rates. By adjusting polymer composition, crosslinking density, and porosity, the release kinetics are tuned to provide sustained release over days while maintaining sufficient release rate for effective fungicidal activity
Solution Approach 2:
The porous polymeric carrier exhibits periodic release behavior through cycles of water absorption, phosphite dissolution, and polymer erosion. This periodic action creates pulses of phosphite release that maintain effective concentrations over time, balancing sustained duration with adequate release rate for fungicidal efficacy
3Device complexity
If conventional carriers are used for phosphite delivery, then formulation simplicity is maintained, but environmental persistence and sustained action are insufficient
Solution Approach 1:
The patent uses commercially available porous polymeric beads that can be easily loaded with phosphite salts through simple mixing or impregnation processes. The porous structure provides high loading capacity while the polymer matrix ensures environmental persistence and controlled release, achieving sustained action without complex formulation steps
Solution Approach 2:
The patent employs cost-effective polymeric bead carriers that can be produced at low cost and applied as single-use formulations. The carriers provide sufficient environmental persistence for the intended release duration (days to weeks) and then degrade or remain in the environment without significant harm, balancing affordability with reliable sustained release performance
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 formulation provides a significantly slower release of phosphite salts, extending the active ingredient's availability in the soil, reducing application frequency, and enhancing plant protection and nutrition, with experimental results showing a cumulative linear increase in phosphite release over time, improving crop yield and vigor.
Implementation Method 1
an absorbent cellulosic carrier with a metal-containing compound... to bind phosphorous acid and monovalent phosphite salts
Implementation Method 2
cumulative linear increase in phosphite release over time
Implementation Method 3
aqueous solution of phosphorous acid or a monovalent phosphite salt... to form a granular composition
Data Source
AI summary
An agrochemical composition comprising:an absorbent cellulosic carrier with one or more metal compound(s) incorporated into the carrier, andan active agent selected from the group consisting of phosphorous acid and phosphite salts that contain the monovalent anion [HP(O)(OX)(O−)], where X is H or CH2CH3.