Ethyleneimine Polymer Solution Molecular Weight Control
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Solution Overview
Problem
Existing ethyleneimine polymers used in applications such as adhesion promoters and wastewater treatment fail to achieve satisfactory properties due to limitations in molecular weight and branch structure control during polymerization.
Innovation Solution
An ethyleneimine polymer solution with a weight average molecular weight of 200,000 or more and a high molecular weight component ratio of 60% or more is achieved by polymerizing ethyleneimine in an aqueous solvent with a polyamine compound and an organic halogen-containing compound, enhancing intermolecular aggregation forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ethyleneimine is polymerized in the absence of a solvent, then the polymerization degree can be increased, but the viscosity becomes too high to obtain the polymer
Solution Approach 1:
Water is introduced as an intermediary solvent to control the viscosity during polymerization. The patent specifies using 1.0 to 40 mass% water with respect to 100 mass% ethyleneimine, which allows the polymerization to proceed to high degree while maintaining manageable viscosity for processing and application.
2Quantity of substance
If conventional polymerization methods are used, then the polymerization can be carried out, but the molecular weight and branch structure cannot be controlled
Solution Approach 1:
The patent controls molecular weight and branch structure by precisely adjusting polymerization parameters: water content (1.0 to 40 mass%), catalyst amount (0.3 to 5 mass%), and temperature (50 to 150°C). These parameter changes enable production of polymer with specific molecular weight (Mn ≥ 13,000) and controlled dispersibility (Mw within 1.4 to 3.0).
3Quantity of substance
If ethyleneimine polymer with high molecular weight is obtained, then the polymerization degree is increased, but the properties are not satisfactory for applications like adhesion promoters and wastewater treatment
Solution Approach 1:
The patent creates local quality differences in the polymer structure by controlling the branch structure through specific polymerization conditions. The resulting polymer has a balanced molecular weight distribution and controlled branching, which provides both high molecular weight benefits and satisfactory application performance in adhesion promotion and wastewater treatment.
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 resulting ethyleneimine polymer solution exhibits excellent properties as enzyme immobilization agents and adhesion improvers, demonstrating improved adhesion strength and coagulation efficiency.
Implementation Method 1
an ethyleneimine polymer solution including an ethyleneimine polymer and an aqueous solvent... a weight average molecular weight (Mw) of the ethyleneimine polymer is 200,000 or more... a ratio of a component having a molecular weight of 30,000 or more is 60 mass% or more
Implementation Method 2
enhancing intermolecular aggregation forces
Data Source
Figure 1
AI summary
There is provided an ethyleneimine polymer (solution) capable of expressing excellent properties when used in such usages as, for example, coagulants for wastewater, papermaking chemicals such as freeness improvers and the like, enzyme immobilization agents, and adhesion improvers (for example, adhesion promoters for extrusion laminate (anchor coating agent)). To solve the above object, there is provided an ethyleneimine polymer solution including an ethyleneimine polymer and water, wherein a weight average molecular weight (Mw) of the ethyleneimine polymer is 200,000 or more, the weight average molecular weight (Mw) being measured based on pullulan by gel permeation chromatography (GPC), and a ratio of a component having a weight average molecular weight (Mw) of 30,000 or more is 60 mass% or more with respect to 100 mass% of a total amount of the ethyleneimine polymer.