ESD Rubber Films Using Precipitated CaCO3 and Chlorination
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Solution Overview
Problem
Existing rubber gloves lack effective electrostatic discharge (ESD) properties, particularly when subjected to sterilization processes, and current methods do not adequately utilize chlorination and specialized fillers like precipitated CaCO3 and organic Azo pigments to enhance conductivity.
Innovation Solution
A process involving immersion in an aqueous coagulant solution, followed by coating with a rubber dispersion, chlorination, and use of precipitated calcium carbonate and organic Azo or Carbon Black pigments to create a static dissipative rubber film with improved ESD properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If mined CaCO3 is used as filler to reduce cost, then manufacturing cost is reduced, but ESD properties deteriorate due to lack of water molecules needed for conductivity
Solution Approach 1:
The patent changes the chemical composition parameter of the filler by using precipitated CaCO3 instead of mined CaCO3. The precipitated form contains water molecules (hydrated) that are crucial for electrical conductivity and ESD properties, while maintaining the cost-effective calcium carbonate base material.
Solution Approach 2:
The patent creates a composite filler system by combining precipitated CaCO3 with specific pigments (Carbon Black, Azo compounds) and undergoes chlorination treatment. This composite approach enhances the ESD properties by creating a network of conductive pathways within the rubber matrix while maintaining cost efficiency.
2Reliability
If chlorination is applied to enhance ESD properties, then electrical conductivity is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent applies chlorination as a preliminary treatment to the rubber compound before glove formation. This preliminary action modifies the rubber matrix to enhance its ESD properties upfront, so that the final product inherently possesses the required electrical conductivity without needing additional complex post-processing steps.
3Device complexity
If conventional rubber composition is used, then manufacturing simplicity is maintained, but static electricity dissipation is insufficient for sensitive environments
Solution Approach 1:
The patent modifies the compositional parameters by incorporating precipitated CaCO3 with specific water content, Carbon Black pigments, and Azo compounds. These parameter changes create conductive pathways within the rubber matrix, enabling effective static electricity dissipation while maintaining a relatively simple overall composition structure.
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 process significantly reduces surface and volume resistivity, enabling gloves to effectively dissipate static electricity and meet stringent ANSI/ESD S20.20 standards, enhancing safety and productivity in sensitive environments.
Implementation Method 1
chlorination, and use of precipitated calcium carbonate and organic Azo or Carbon Black pigments to create a static dissipative rubber film with improved ESD properties
Implementation Method 2
use of precipitated calcium carbonate and organic Azo or Carbon Black pigments to create a static dissipative rubber film
Implementation Method 3
precipitated CaCO3 filler, combined with a pigment of an organic Azo compound... will grant such rubber elastomers a better electrostatic discharge (ESD) properties
Implementation Method 4
Carbon Black pigment, each of them along with chlorination, will grant such rubber elastomers a better electrostatic discharge (ESD) properties
Implementation Method 5
pigment of an organic Azo compound having CAS No. 3520-72-7... will grant such rubber elastomers a better electrostatic discharge (ESD) properties
Data Source
AI summary
A method for making rubber films with improved ESD (electrostatic discharge) property relates to a method for making better ESD gloves using improved rubber composition with a precipitated CaCO3 filler. In addition, non-metallic filled organic pigment such as AZO compounds are suggested to make better ESD gloves. Additionally, other improved method steps such as chlorination and addition of Carbon Black in conjunction with chlorination are suggested to make better ESD gloves.