Polyisoprene Latex Aggregate Suppression via Surfactant Mediation
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Solution Overview
Problem
The occurrence of aggregates during the production of synthetic polyisoprene latex with high solid content concentration is a challenge, leading to inefficiencies and environmental issues.
Innovation Solution
A method involving the addition of a carboxyl group-containing compound and specific anionic surfactants with varying molecular weights to the polyisoprene latex, allowing for effective suppression of aggregate formation even at high solid content concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the concentration of synthetic polyisoprene is increased in the water phase during graft polymerization, then productivity and solid content are improved, but aggregates occur during the reaction
Solution Approach 1:
The patent introduces a specific anionic surfactant as an intermediary substance to mediate between the high solid content polyisoprene latex and the carboxyl group-containing monomer. The surfactant with molecular weight 500-5000 adsorbs at the interface, reducing interfacial tension and preventing aggregate formation while enabling successful graft polymerization at high solid contents (30-70 wt%).
Solution Approach 2:
The patent changes the molecular weight parameter of the anionic surfactant to a specific range (500-5000) to optimize its performance. This parameter change enables the surfactant to effectively stabilize the latex system at high solid contents while facilitating monomer incorporation, thereby preventing aggregate formation during graft polymerization.
2Ease of manufacture
If natural rubber latex is used for dip-molding products, then ease of manufacture is improved, but protein allergy symptoms occur in human bodies
Solution Approach 1:
The patent changes the chemical composition parameter by replacing natural rubber latex with synthetic polyisoprene latex. This substitution eliminates protein content while maintaining the elastomeric properties necessary for dip-molding applications, thereby preventing protein allergy symptoms in users.
Solution Approach 2:
The patent creates a modified composite material system by incorporating carboxyl group-containing compounds into synthetic polyisoprene latex through graft polymerization. This composite structure provides both the safety of protein-free synthetic rubber and enhanced functional properties for dip-molded products.
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
This approach enhances the production efficiency of modified polymer latex with high solid content, reducing waste and environmental impact while maintaining product quality.
Implementation Method 1
adding a carboxyl group-containing compound, an anionic surfactant having a weight-average molecular weight of less than 500, and an anionic surfactant having a weight-average molecular weight of 500 or more to a polyisoprene latex; and reacting the polyisoprene with the carboxyl group-containing compound in a presence of the anionic surfactant having a weight-average molecular weight of less than 500 and the anionic surfactant having a weight-average molecular weight of 500 or more
Data Source
AI summary
A method for producing a modified polymer latex includes: adding a carboxyl group-containing compound, an anionic surfactant having a weight-average molecular weight of less than 500, and an anionic surfactant having a weight-average molecular weight of 500 or more to a polyisoprene latex; and reacting the polyisoprene with the carboxyl group-containing compound in a presence of the anionic surfactant having a weight-average molecular weight of less than 500 and the anionic surfactant having a weight-average molecular weight of 500 or more.