Odor Inhibitors for Ghost Odour in Coatings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The persistence of 'ghost odor' in dried and aged coatings, characterized by unpleasant smells like cat urine, sweaty, onion-like, or rubbery scents, particularly noticeable in warm weather and high humidity, remains unsolved despite efforts to address volatile organic compounds (VOCs) and microbial VOCs, due to the difficulty in avoiding sulfur compounds which cause these odors.
Innovation Solution
Incorporating specific inhibitors such as iodoform, chlorothalonil, hydroxylamine-o-sulfonic acid, and other compounds into coating materials containing methyl-4-isothiazolin-3-one and/or octyl-4-isothiazolin-3-one to reduce or prevent the occurrence of ghost odor, which are effective even in small concentrations and across various coating types including paints and adhesives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sulfur compounds are used in coating materials, then preservation and biocidal effectiveness are improved, but ghost odor occurrence increases
Solution Approach 1:
The patent introduces odor inhibitors as intermediary substances that mediate between the sulfur-containing preservatives (MIT/OIT) and the environment. These inhibitors specifically target and neutralize the sulfur compounds responsible for ghost odor without compromising the biocidal effectiveness of the preservatives, thus resolving the contradiction between preservation reliability and odor generation
Solution Approach 2:
The patent converts the harmful sulfur compounds that cause ghost odor into beneficial effects by using odor inhibitors to transform them into non-odorous substances. The sulfur compounds continue to provide preservation functionality while their harmful odor-generating properties are converted into neutral or beneficial states through chemical interaction with the inhibitors
2Object-generated harmful factors
If sulfur compounds are avoided to prevent ghost odor, then odor occurrence is reduced, but preservation effectiveness deteriorates
Solution Approach 1:
The odor inhibitors serve as intermediaries that allow the continued use of sulfur-containing preservatives without transferring the harmful odor effect to the environment. This mediator approach enables maintaining preservation reliability while eliminating the need to avoid sulfur compounds
3Reliability
If conventional preservation methods are used, then biocidal protection is improved, but ghost odor in dried coatings remains unsolved
Solution Approach 1:
The patent applies preliminary action by incorporating odor inhibitors into the coating formulation before application. These inhibitors are pre-positioned to counteract the ghost odor formation that occurs after drying, addressing the problem in advance rather than treating it after the odor appears
Solution Approach 2:
The odor inhibitors act as intermediaries that bridge the gap between conventional preservation methods and ghost odor prevention, allowing the biocidal protection to function effectively while simultaneously preventing the formation of unpleasant odors in dried coatings
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 use of these inhibitors significantly reduces the occurrence of ghost odor in coatings, ensuring a more pleasant indoor environment by minimizing the perception of unpleasant smells, even after the coatings have dried and aged.
Implementation Method 1
Incorporating specific inhibitors such as iodoform, chlorothalonil, hydroxylamine-o-sulfonic acid, and other compounds into coating materials containing methyl-4-isothiazolin-3-one and/or octyl-4-isothiazolin-3-one to reduce or prevent the occurrence of ghost odor
Data Source
AI summary
The invention relates to compounds from the groups of (A) electrophiles, (B) nucleophiles, (C) alkylating agents, (D) antioxidants, and (E) oxidizing agents as odor inhibitors for reducing so-called ghost odor caused by 2-methyl-4-isothiazolin-3-one and/or octyl-4-isothiazolin-3-one. The invention further relates to biocidal compositions containing 2-methyl-4-isothiazolin-3-one and/or octyl-4-isothiazolin-3-one, as well as one or more odor inhibitors, and the use of odor inhibitors for preventing ghost odor.