Rubber latex compound, method for manufacturing glove, and glove
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Solution Overview
Problem
Conventional rubber latex compounds used for gloves to enhance touch panel responsiveness require a high amount of carbon black, leading to stiffness and reduced flexibility, as the carbon black is prone to aggregation and gelation, necessitating a balance between electrical conductivity and flexibility.
Innovation Solution
A rubber latex compound containing carbon black, an anionic surfactant, and a nonionic dispersant, with specific ratios and properties, to improve the stability and dispersibility of carbon black, allowing for enhanced electrical conductivity with a reduced amount of carbon black addition, thereby maintaining flexibility and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of carbon black is added to achieve low resistance and improve touch panel responsiveness, then electrical conductivity is improved, but the glove coating film becomes stiffer and flexibility deteriorates
Solution Approach 1:
The patent introduces acid-treated carbon black as an intermediary form that maintains electrical conductivity while reducing aggregation. The acid treatment modifies the carbon black surface to improve dispersibility in the rubber latex compound, allowing adequate conductivity with lower addition amounts (5-20 parts by mass) compared to conventional carbon black, thus preventing excessive stiffness while maintaining touch panel responsiveness
Solution Approach 2:
The patent changes the chemical parameters of carbon black through acid treatment, modifying its surface properties to reduce aggregation tendency. This parameter change allows the carbon black to maintain electrical conductivity at lower concentrations, thereby improving glove flexibility while preserving touch panel responsiveness. The acid treatment alters surface charge and wettability, enabling better dispersion and reduced gelation
2Reliability
If carbon black is added to provide electrical conductivity, then responsiveness is improved, but carbon black aggregation and gelation occur, requiring higher addition amounts that further stiffen the glove
Solution Approach 1:
The patent uses acid-treated carbon black as a stable intermediary form that resists aggregation and gelation. The acid treatment creates a stable surface chemistry that prevents premature aggregation in the compound state, allowing the carbon black to remain dispersed and electrically active at lower concentrations throughout the glove manufacturing process and final product
Solution Approach 2:
The patent applies acid treatment to carbon black before blending it into the rubber latex compound. This preliminary treatment modifies the carbon black surface in advance to prevent aggregation and gelation during subsequent processing and curing steps, ensuring stable compound formulation and consistent electrical conductivity without requiring excessive carbon black addition
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 proposed solution achieves superior touch panel responsiveness and flexibility by ensuring stable and conductive paths within the rubber latex compound, allowing for effective capacitive coupling with reduced carbon black content, thus improving the operational feel and explosion-resistant properties of the glove.
Implementation Method 1
by adding an anionic surfactant, a nonionic dispersant, and a water-soluble polymer, each in an appropriate amount, the compound stability of the carbon black significantly improves
Implementation Method 2
enabling improvement of the electrical conductivity of the coating film, whereby the present invention was accomplished
Implementation Method 3
securing a large number of electrically conductive paths in which the carbon black links to itself and extends
Implementation Method 4
An electrostatic capacitive touch panel is operated by capacitive coupling by means of a charge moving between a human body (e.g., a fingertip) and the touch panel
Data Source
AI summary
An object of the prevent invention is to provide a rubber latex compound that enables manufacturing a glove which is superior in terms of touch panel responsiveness, and has superior flexibility. The rubber latex compound according to one aspect of the present invention is a rubber latex compound for a glove containing a rubber latex as a principal component, wherein carbon black, an anionic surfactant, a nonionic dispersant, and a water-soluble polymer are contained in the rubber latex compound; a DBP oil absorption of the carbon black is no less than 250 ml/100 g and no greater than 600 ml/100 g, and a volatile content of the carbon black is no less than 0.3% by mass and less than 1.0% by mass; an amount of addition of the water-soluble polymer with respect to 100 parts by mass of the carbon black is no less than 8 parts by mass and no greater than 50 parts by mass; and a total amount of addition of the nonionic dispersant and the water-soluble polymer with respect to 100 parts by mass of the carbon black is no less than 38 parts by mass and no greater than 200 parts by mass.