Stable Insecticidal Composition Using pH Adjuster
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge lies in creating a stable insecticidal composition that combines emamectin benzoate and cartap, as they are highly unstable and require different environmental conditions, making it difficult to formulate a stable mixture due to their sensitivity to pH variations, leading to degradation issues when applied together.
Innovation Solution
A stable solid insecticidal composition is developed by incorporating an effective amount of emamectin benzoate and cartap with a pH adjuster, maintaining a pH of less than 5.5 after dilution, and ensuring a water content of less than 0.5% by weight, which stabilizes the active ingredients and reduces degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emamectin benzoate and cartap are combined in a single composition, then the efficacy is increased and resistance is prevented, but the stability of the composition deteriorates due to conflicting pH requirements
Solution Approach 1:
The patent applies parameter changes by adjusting the pH of the composition to an acidic range (pH 3-5) which is suitable for cartap stability. This parameter change allows the composition to maintain stability while combining both emamectin benzoate and cartap, resolving the contradiction between efficacy and stability.
Solution Approach 2:
The patent uses an intermediary substance (acidic buffer or pH adjuster) to mediate between the conflicting pH requirements of emamectin benzoate (stable at pH 5-8) and cartap (stable at pH <5). This intermediary creates a compromise environment that maintains both ingredients' stability while enabling their combined use.
2Stability of the object's composition
If the composition is formulated to stabilize emamectin benzoate (pH 5-8), then emamectin stability is improved, but cartap degradation increases
Solution Approach 1:
The patent changes the pH parameter from the emamectin-optimal range (5-8) to a lower acidic range (3-5). This parameter change prioritizes cartap stability while accepting a compromise on emamectin stability, preventing cartap degradation which would otherwise be severe at higher pH values.
Solution Approach 2:
The patent converts the potentially harmful acidic environment (which would normally degrade emamectin) into a beneficial condition by using it to protect cartap from degradation. The acidification that would harm emamectin is instead used to preserve cartap, and the synergistic combination compensates for any emamectin loss.
3Stability of the object's composition
If the composition is formulated to stabilize cartap (pH <5), then cartap stability is improved, but emamectin degradation increases
Solution Approach 1:
The patent adjusts the pH parameter to the acidic range (3-5) which optimizes cartap stability. This parameter change accepts increased emamectin degradation as a trade-off, but the synergistic combination ensures overall efficacy is maintained or improved.
Solution Approach 2:
The patent merges emamectin benzoate and cartap into a single composition with synergistic interaction. This combination allows the use of sub-optimal pH conditions for emamectin (acidic environment) while still achieving effective insect control through the complementary action of both ingredients.
4Ease of operation
If water content is increased to facilitate application, then application efficiency is improved, but degradation of active ingredients increases
Solution Approach 1:
The patent changes the water content parameter to a low level (less than 0.5% by weight) which minimizes hydrolytic degradation of the active ingredients. This parameter change maintains application efficiency through proper formulation while preventing water-induced decomposition.
Solution Approach 2:
The patent creates an inert environment by limiting water content to less than 0.5%, effectively removing water (a reactive substance) from the system. This inert environment prevents water-mediated degradation reactions while still allowing the composition to be formulated and applied effectively.
Data Source
AI summary
The present invention provides a method for controlling the degradation of emamectin and cartap, the method comprising formulating a composition which comprises an amount of water less than 0.5% by weight based on the total weight of the stable composition and at least one pH adjuster for maintaining the pH at 25° C. after dilution in water at less than 5.5. The present invention further provides a stable solid insecticidal composition comprising: (1) an effective amount of emamectin; (2) an effective amount of cartap; and (3) at least one pH adjuster; wherein the composition is substantially free of water and the pH at 25° C. after dilution with water is less than 5.5.