IPBC and NOIT Antifungal Formulation Stability
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Solution Overview
Problem
Current formulations containing 3-iodopropargylbutylcarbamate (IPBC) and n-octylisothiazolinone (NOIT) face challenges with storage stability and VOC-free compatibility, as IPBC decomposes under heat or light, leading to discoloration and agglomeration issues when combined in liquid dispersions.
Innovation Solution
Development of VOC-free, stable liquid formulations using solvents with a boiling point of 250 °C or more, such as polyethylene glycols and dialkyl adipates, with a solvent proportion of 0-3% by weight, and active ingredient proportions of 30-80% by weight, along with optional emulsifiers to maintain stability and prevent heteroflocculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If IPBC and NOIT are formulated as aqueous dispersions without additional solvents to achieve VOC-free formulations, then VOC emissions are reduced, but IPBC decomposes in the presence of heat or light causing discoloration and heteroflocculation
Solution Approach 1:
The patent introduces a specific intermediary substance (polyethylene glycol or polypropylene glycol) to mediate between IPBC and NOIT in the aqueous dispersion. This mediator prevents the direct harmful interaction between IPBC and NOIT that causes heteroflocculation and decomposition, while maintaining the VOC-free requirement. The glycol acts as a stabilizing agent that allows both active ingredients to coexist without adverse reactions.
Solution Approach 2:
The patent changes the formulation parameters by introducing specific glycol components with defined molecular weights and concentrations. By adjusting the type and amount of polyethylene glycol or polypropylene glycol, the formulation achieves stability against heat and light-induced decomposition while maintaining VOC-free status. This parameter adjustment prevents the adverse interactions that occur in simple aqueous dispersions.
2Reliability
If IPBC is combined with NOIT in liquid dispersions to achieve synergistic antifungal effect, then antifungal effectiveness is improved, but strong heteroflocculation occurs resulting in agglomerates and sedimentation
Solution Approach 1:
The glycol component serves as an intermediary that prevents direct heteroflocculation between IPBC and NOIT molecules. By introducing this mediator substance, the formulation maintains the synergistic antifungal effect of the active ingredient combination while preventing the adverse heteroflocculation that would otherwise cause agglomerate formation and sedimentation.
3Stability of the object's composition
If conventional solvents are used to dissolve IPBC and NOIT, then formulation stability is improved, but VOC content increases
Solution Approach 1:
The patent changes the solvent system parameters by replacing conventional VOC-based solvents with water as the primary solvent and using polyethylene glycol or polypropylene glycol as co-solvents. This parameter change achieves both goals: eliminating VOC emissions while maintaining adequate dissolution and stability of IPBC and NOIT through the glycol components.
Solution Approach 2:
The glycol components act as intermediary substances that enable IPBC and NOIT to remain dissolved in the aqueous-based formulation without requiring conventional VOC solvents. This intermediary approach maintains dissolution stability while achieving VOC-free status.
Data Source
AI summary
The invention relates to stable antifungal liquid formulations for protecting material, containing 3-iodopropynyl butyl carbamate (IPBC) and n-octylisothiazolinone (n-OIT).