Polycarbonate Urethane Glove Coating for Chemical Resistance
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Solution Overview
Problem
Current rubber-based gloves face issues with allergies due to protein content and vulcanization agents, and existing urethane resin coatings lack both high flexibility and chemical resistance, particularly alcohol resistance.
Innovation Solution
A glove coating formed from a urethane resin composition using a polycarbonate polyol and water, with specific urethane resins having hydrophilic groups and emulsifiers, achieving a 500% modulus of 7 MPa or less for enhanced flexibility and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyester polyol is used to enhance chemical resistance, then chemical resistance is improved, but hydrolysis resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by using polycarbonate polyol instead of polyester polyol, and by controlling the molecular weight and hydroxyl value of the polyol to achieve both high chemical resistance and hydrolysis stability
Solution Approach 2:
The patent creates a composite urethane resin system combining polycarbonate polyol with specific polyisocyanate and chain extender to achieve synergistic effects that provide both chemical resistance and hydrolysis resistance
2Reliability
If polycarbonate polyol is used to enhance chemical resistance, then chemical resistance is improved, but the coating cures
Solution Approach 1:
The patent optimizes the molecular weight (2000-10000) and hydroxyl value (30-100 mg KOH/g) of the polycarbonate polyol to control the crosslinking density, preventing excessive curing while maintaining chemical resistance
Solution Approach 2:
The patent uses a controlled amount of polycarbonate polyol (50-95 mass%) in the urethane resin composition, avoiding excessive crosslinking that would cause curing, while still achieving the desired chemical resistance
3Strength
If conventional rubber is used for gloves, then rubber elasticity is achieved, but allergy problems occur due to protein and vulcanizing agents
Solution Approach 1:
The patent extracts and eliminates the harmful components (natural rubber protein and vulcanizing agents) by using synthetic polycarbonate polyol-based urethane resin, while retaining the desired rubber elasticity through polymer chain flexibility
Solution Approach 2:
The patent changes the material composition from natural rubber to synthetic urethane resin, altering the chemical structure to remove allergenic components while maintaining elastic properties through polymer design
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 provides high flexibility and chemical resistance, particularly alcohol resistance, while minimizing environmental impact, making it suitable for industrial and medical applications.
Implementation Method 1
a urethane resin having rubber elasticity and not containing the above-mentioned substances
Data Source
AI summary
The present invention provides a glove having a coating formed of a urethane resin composition including a urethane resin (A) and water (B). The urethane resin (A) is produced using a polycarbonate polyol (a1-1) as a raw material. The coating has a 500% modulus of 7 MPa or less. Example urethane resins used as the urethane resin (A) preferably include: a urethane resin produced using a polycarbonate polyol (a1-1) and polytetramethylene glycol (a1-2) as raw materials at a specified mass ratio; and/or a urethane resin produced using a polycarbonate polyol (a1-1) and a compound (a1-4) as raw materials at a specified mass ratio, the compound (a1-4) having a number average molecular weight of less than 500, a branched structure, and 2 to 4 hydroxyl groups.