Carboxylic Acid Modified-Nitrile Latex for Dip-Formed Gloves
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Solution Overview
Problem
Existing rubber gloves made using sulfur and vulcanization accelerators have issues with durability, skin allergies, unpleasant odors, discoloration, and require long stir ripening processes, while alternatives using organic peroxides or cross-linkable monomers face safety concerns and heat sensitivity.
Innovation Solution
A latex composition for dip-forming comprising two types of carboxylic acid modified-nitrile based copolymer latexes with specific glass transition temperatures and particle diameters, combined with a reactive compound, which eliminates the need for sulfur and vulcanization accelerators, enhancing tensile strength, elongation percentage, and durability without long stir ripening processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If sulfur and vulcanization accelerator are used to enhance durability and tensile strength, then the rubber gloves have improved strength and durability, but a long stir ripening process of 24 hours or longer is required causing productivity decline
Solution Approach 1:
The patent changes the chemical composition parameters by replacing sulfur and vulcanization accelerator with organic peroxide as the crosslinking agent. This parameter change eliminates the need for long stir ripening processes while maintaining crosslinking effectiveness, thereby improving productivity without sacrificing tensile strength
Solution Approach 2:
The patent extracts and removes sulfur and vulcanization accelerator from the latex composition, replacing them with organic peroxide. This extraction eliminates the harmful side effects and long processing times associated with sulfur-based vulcanization while preserving the essential crosslinking function needed for strength
2Duration of action of stationary object
If sulfur and vulcanization accelerator are used to improve durability, then the rubber gloves are not damaged even when used for a long period of time, but unpleasant smell due to sulfur is caused when continuing working with the gloves
Solution Approach 1:
The patent extracts and removes sulfur from the latex composition, replacing it with organic peroxide as the crosslinking agent. This elimination of sulfur removes the source of unpleasant odors while maintaining the crosslinking structure that provides long-term durability
Solution Approach 2:
The patent converts the harmful sulfur-based crosslinking system into a beneficial organic peroxide-based system. The organic peroxide provides effective crosslinking for durability without producing the unpleasant sulfur smell, effectively turning a harmful chemical approach into a beneficial one
3Strength
If sulfur and vulcanization accelerator are used to enhance strength, then the strength of the rubber gloves is enhanced, but discoloration of the rubber gloves occurs decreasing commodity value
Solution Approach 1:
The patent removes sulfur and vulcanization accelerator from the composition and replaces them with organic peroxide. This extraction eliminates the discoloration problem caused by sulfur while maintaining the crosslinking structure necessary for enhanced strength
Solution Approach 2:
The patent changes the chemical composition by substituting sulfur-based crosslinking with organic peroxide-based crosslinking. This parameter change in the crosslinking mechanism prevents discoloration while preserving the strength-enhancing crosslinking structure
4Reliability
If sulfur and vulcanization accelerator are used to improve durability, then cross-linked bonds are formed between polymer chains, but allergy reactions for some users resulting in skin disorders such as tingling are induced
Solution Approach 1:
The patent extracts and removes sulfur and vulcanization accelerator from the latex composition, replacing them with organic peroxide. This removal eliminates the allergenic sulfur compounds while maintaining the crosslinking structure that provides durability and reliability
Solution Approach 2:
The patent converts the harmful sulfur-based crosslinking system into a beneficial organic peroxide-based system. The organic peroxide provides effective crosslinking for durability without causing allergy reactions, effectively transforming a harmful approach into a safe and beneficial one
5Productivity
If organic peroxide is used to avoid long stir ripening process and discoloration, then process time is reduced and discoloration is prevented, but process safety is very inferior since organic peroxides may cause fires and explosions when heat or impacts are applied
Solution Approach 1:
The patent changes the concentration and type of organic peroxide used, along with modifying processing parameters such as temperature and mixing conditions. These parameter changes reduce the fire and explosion risk while maintaining the productivity benefits of shorter processing times
Solution Approach 2:
The patent implements safety measures and controlled processing conditions beforehand to cushion against the inherent risks of organic peroxide. By controlling temperature, concentration, and mixing conditions, the patent prevents fire and explosion hazards while maintaining efficient processing
6Reliability
If cross-linkable monomer is used to avoid sulfur and vulcanization accelerator, then allergy reactions and long stir ripening process are avoided, but the rubber gloves are very sensitive to heat since they are made from acryl that is vulnerable for heat
Solution Approach 1:
The patent uses composite materials by combining carboxylic acid modified-nitrile based copolymer latex with organic peroxide. This composite approach provides both allergy resistance (by eliminating sulfur and cross-linkable monomers) and improved heat stability (through the nitrile-based polymer structure and controlled crosslinking)
Solution Approach 2:
The patent changes the polymer composition parameters by using carboxylic acid modified-nitrile based copolymer instead of plain acryl, and controls the crosslinking degree through organic peroxide. These parameter changes reduce heat sensitivity while maintaining allergy resistance
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 latex composition provides rubber gloves with superior tensile strength, elongation percentage, and durability, addressing the limitations of previous technologies while ensuring safety and reducing production time and odor issues.
Implementation Method 1
sulfur forms cross-linked bonds between polymer chains
Data Source
AI summary
The present invention relates to a latex composition for dip-forming including two different types of carboxylic acid modified-nitrile based copolymer latex, and a dip-formed article prepared therefrom having excellent durability for sweat, and having high tensile strength and elongation percentage. Accordingly, the latex composition for dip-forming has excellent tensile strength, elongation percentage, stress and durability, and is useful in industries requiring these, for example, a rubber glove industry and the like.