Latex Stabilizer Polymer for Dip Molding
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Solution Overview
Problem
The existing latex compositions for dip molding suffer from low storage stability and low temperature stability, leading to increased coagulation and defects in molded articles, and nitrile-based rubber gloves lack the softness and wearability of natural rubber gloves.
Innovation Solution
A polymer composition is developed, comprising a conjugated diene-based monomer unit, an ethylenically unsaturated nitrile-based monomer unit, and an ethylenically unsaturated acid monomer unit, with a weight average molecular weight of 5,000 g/mol to 50,000 g/mol and a glass transition temperature of −34° C. to 33° C., which is used as a latex stabilizer to improve the stability and softness of molded articles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nitrile-based rubber is used to replace natural rubber, then chemical resistance is improved, but softness and wearability deteriorate
Solution Approach 1:
The patent uses a composite latex system combining nitrile-based rubber latex with a specific polymer stabilizer (polymer A) that has controlled molecular weight (5,000-50,000 g/mol) and glass transition temperature (-34°C to 33°C). This composite approach maintains the chemical resistance of nitrile rubber while the stabilizer polymer improves softness and wearability by modifying the latex matrix structure
Solution Approach 2:
The patent applies parameter changes by controlling the glass transition temperature of the stabilizer polymer within -34°C to 33°C and molecular weight within 5,000-50,000 g/mol. These parameter optimizations allow the stabilizer to enhance softness and flexibility without compromising the chemical resistance of the nitrile rubber base material
2Stability of the object's composition
If latex for dip molding is stored at low temperature, then storage stability should be improved, but coagulation and precipitate increase
Solution Approach 1:
The patent introduces polymer A as an intermediary stabilizer with specific molecular weight and glass transition temperature characteristics. This stabilizer polymer acts as a mediator that prevents direct interaction between latex particles at low temperatures, thereby preventing coagulation and precipitate formation while maintaining storage stability
Solution Approach 2:
The patent optimizes the glass transition temperature parameter of the stabilizer polymer to be within -34°C to 33°C, which ensures the stabilizer remains effective at low storage temperatures. This parameter control allows the stabilizer to maintain latex particle separation and prevent cold-induced coagulation
3Strength
If polymer molecular weight is increased to improve tensile strength, then strength is improved, but softness deteriorates
Solution Approach 1:
The patent precisely controls the molecular weight parameter of the stabilizer polymer within 5,000-50,000 g/mol and glass transition temperature within -34°C to 33°C. This parameter optimization achieves a balance where the stabilizer provides sufficient tensile strength while maintaining softness and flexibility of the final glove product
Data Source
AI summary
Provided is a polymer composition applicable as a latex stabilizer of a latex composition for dip molding, a method for preparing the same, a latex composition for dip molding, including the same to have improved latex stability, and a molded article molded therefrom to have improved wearability and tensile properties.