Dip-Molded Nitrile Rubber Glove Layering for Wearability
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Solution Overview
Problem
Rubber gloves face challenges in balancing wearability and chemical resistance, with natural rubber gloves lacking chemical resistance and causing allergic reactions, while nitrile-based gloves are stiff and unsuitable for delicate work due to high modulus and low elasticity.
Innovation Solution
A dip-molded article is created with an external layer containing 35 wt % to 60 wt % ethylenically unsaturated nitrile-based monomer-derived repeating units for chemical resistance and an internal layer with 10 wt % to 28 wt % for improved wearability, using a method involving multiple latex compositions and coagulants for cross-linking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If natural rubber is used for gloves, then wearability is improved due to low modulus and high elastic properties, but chemical resistance and oil resistance deteriorate to very low levels
Solution Approach 1:
The glove is divided into multiple layers with different material compositions. The inner layer uses natural rubber for wearability, while outer layers use nitrile-based rubber for chemical resistance, creating a segmented structure that combines advantages of different materials
Solution Approach 2:
The patent creates a composite glove structure combining natural rubber and nitrile-based rubber in specific layers, achieving both wearability from natural rubber and chemical resistance from nitrile rubber through material composition
2Reliability
If nitrile-based rubber is used for gloves, then chemical resistance and oil resistance are improved, but wearability deteriorates due to high modulus and low elasticity
Solution Approach 1:
The glove is divided into multiple layers with different material compositions. The inner layer uses natural rubber for wearability, while outer layers use nitrile-based rubber for chemical resistance, creating a segmented structure that combines advantages of different materials
Solution Approach 2:
The patent creates a composite glove structure combining natural rubber and nitrile-based rubber in specific layers, achieving both wearability from natural rubber and chemical resistance from nitrile rubber through material composition
3Reliability
If nitrile-based rubber glove is used, then chemical resistance is improved, but elasticity deteriorates resulting in poor adhesion to hand
Solution Approach 1:
The glove is divided into multiple layers with different material compositions. The inner layer uses natural rubber for wearability, while outer layers use nitrile-based rubber for chemical resistance, creating a segmented structure that combines advantages of different materials
Solution Approach 2:
The patent creates a composite glove structure combining natural rubber and nitrile-based rubber in specific layers, achieving both wearability from natural rubber and chemical resistance from nitrile rubber through material composition
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 solution simultaneously enhances wearability and chemical resistance, providing a flexible and durable glove suitable for various work environments.
Implementation Method 1
a step S20 of dipping the dip molding mold to which the coagulant is attached into a first latex composition for dip molding to form a layer derived from the first latex composition for dip molding
Implementation Method 2
a step S40 of heating the layer derived from the first latex composition for dip molding and the layer derived from the second latex composition for dip molding to cross-link the first latex composition for dip molding and the second latex composition for dip molding
Data Source
AI summary
A dip-molded article includes an external molded layer and internal molded layer. The external molded layer includes a content of an ethylenically unsaturated nitrile-based monomer-derived repeating unit is 35 wt % to 60 wt %, and the internal molded layer in which a content of an ethylenically unsaturated nitrile-based monomer-derived repeating unit is 10 wt % to 28 wt %.