Chlorosulfonated Polyethylene Latex Emulsification for RFL Adhesives
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Solution Overview
Problem
Chlorosulfonated polyethylene latexes used in RFL adhesives face issues with safety for living bodies and the environment due to endocrine-disrupting emulsifying agents, and they have inferior standing and mechanical stability, as well as reduced adhesive strength compared to polyoxyethylene alkyl phenyl ether sulfate-based formulations.
Innovation Solution
A chlorosulfonated polyethylene latex is developed using a polyoxyalkylene alkyl ether sulfate and a fatty acid salt as emulsifying agents, which improves safety, stability, and adhesive strength, with the latex containing 0.3 to 12 parts by mass of polyoxyalkylene alkyl ether sulfate and 0.1 to 2.5 parts by mass of fatty acid salt per 100 parts by mass of chlorosulfonated polyethylene, along with optional polyvinylpyrrolidone for enhanced stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyoxyethylene alkyl phenyl ether sulfate is used as an emulsifying agent, then adhesive strength and standing stability are improved, but safety for living bodies and environment deteriorates due to endocrine disrupting effects
Solution Approach 1:
The invention extracts and removes the harmful polyoxyethylene alkyl phenyl ether sulfate emulsifying agent from the latex formulation while replacing it with safe alternatives (polyoxyalkylene alkyl ether sulfate and fatty acid salt), thereby eliminating endocrine disrupting effects while maintaining adhesive strength and standing stability
Solution Approach 2:
The invention introduces polyoxyalkylene alkyl ether sulfate and fatty acid salt as intermediary emulsifying agents that can perform the necessary emulsification function without the harmful endocrine disrupting properties of the original agent, thus mediating between safety requirements and performance requirements
2Object-affected harmful factors
If alternative emulsifying agents (fatty acid salts, organic sulfates, organic sulfonates) are used, then safety for living bodies and environment is improved, but standing stability and mechanical stability deteriorate
Solution Approach 1:
The invention merges two alternative emulsifying agents (polyoxyalkylene alkyl ether sulfate and fatty acid salt) into a combined formulation that achieves both safety and stability, overcoming the limitations of using either alternative agent alone
Solution Approach 2:
The invention creates a composite emulsifying system combining polyoxyalkylene alkyl ether sulfate and fatty acid salt in specific proportions, where the synergistic interaction between the two components provides both safety and the required standing stability and mechanical stability
3Object-affected harmful factors
If alternative emulsifying agents are used, then safety for living bodies and environment is improved, but adhesive strength of RFL adhesive deteriorates
Solution Approach 1:
The invention extracts the harmful component while preserving the functional performance by using a combination of polyoxyalkylene alkyl ether sulfate and fatty acid salt that together can deliver the necessary adhesive strength for RFL adhesives without endocrine disrupting effects
Solution Approach 2:
The invention optimizes the concentration parameters of the alternative emulsifying agents (0.3 to 12 parts by mass of polyoxyalkylene alkyl ether sulfate and 0.1 to 2.5 parts by mass of fatty acid salt per 100 parts by mass of chlorosulfonated polyethylene) to achieve the required adhesive strength while maintaining safety
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 latex achieves higher safety and stability for living bodies and the environment while maintaining or exceeding the adhesive strength of traditional formulations, ensuring effective bonding in RFL adhesives.
Implementation Method 1
a chlorosulfonated polyethylene latex, which contains an aqueous dispersion medium, chlorosulfonated polyethylene, a polyoxyalkylene alkyl ether sulfate represented by formula (I) below, and a fatty acid salt
Implementation Method 2
a polyoxyalkylene alkyl ether sulfate represented by formula (I) below, and a fatty acid salt
Data Source
AI summary
A chlorosulfonated polyethylene latex, which is safe for living bodies and the environment and can be used as a latex component in a resorcin-formalin-latex adhesive, contains an aqueous dispersion medium, chlorosulfonated polyethylene, and an emulsifying agent of a polyoxyalkylene alkyl ether sulfate of formula (I) below and a fatty acid salt. The latex is excellent in standing stability and mechanical stability. In formula (I), R1, R2, n, and M represent an alkyl group of 6 to 20 carbon atoms, hydrogen or a methyl group, an integer of 2 to 40, and an alkali metal, respectively.R1—O—(CH2CHR2—O)n—SO3M (I)