Self-Stabilized Glyoxalated Polyacrylamide Resin Synthesis
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Solution Overview
Problem
Conventional synthesis of glyoxalated polyacrylamide (gPAM) resins requires low solids and strict pH control, leading to rapid gelation and a short shelf life, and relies on hazardous acids for quenching, complicating storage and transportation.
Innovation Solution
A self-stabilized gPAM resin composition is produced by reacting a cationic polyacrylamide (cPAM) prepolymer with glyoxal in an aqueous mixture at low solids and a pH of at least 7.5, without adding any acid, maintaining a single phase for at least one day.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional synthesis of gPAM resin is carried out at low solids and high pH to facilitate crosslinking reaction, then the reaction rate increases and crosslinking is achieved, but the resin gels rapidly and shelf life is reduced
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the reaction mixture to a controlled pH range (7.5-9.0) before initiating the glyoxalation reaction. This pre-conditioning allows the reaction to proceed at an optimal rate while preventing premature gelation, thereby extending shelf life without sacrificing reaction efficiency
Solution Approach 2:
The patent utilizes parameter changes by carefully controlling and adjusting the pH level during the reaction process. By maintaining the pH within a specific range (7.5-9.0) rather than using high pH, the patent achieves a balance between reaction rate and gelation control, resolving the contradiction between speed and shelf life
2Stability of the object's composition
If acid is added to quench the crosslinking reaction and stabilize gPAM resin, then the resin becomes stable for storage, but hazardous acids are used complicating safety and logistics
Solution Approach 1:
The patent converts the harmful factor (need for acid quenching) into a benefit by demonstrating that the crosslinking reaction can be naturally quenched and stabilized without adding hazardous acids. The reaction mixture self-stabilizes through controlled pH management and reaction conditions, eliminating the harmful acid quenching step while maintaining resin stability
Solution Approach 2:
The patent applies self-service by enabling the reaction mixture to quench and stabilize itself without external intervention from hazardous acids. The controlled pH conditions and reaction parameters allow the system to naturally terminate the crosslinking reaction and maintain stability, eliminating the need for external acid quenching agents
3Productivity
If high molecular weight drainage aids are used to achieve excellent drainage and retention, then drainage performance improves, but strength benefits are reduced due to over-flocculation
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight and structure of the polyacrylamide resin to achieve the desired balance between drainage and strength. By carefully controlling the resin characteristics and reaction conditions, the patent resolves the contradiction between drainage performance and strength preservation
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 method provides a stable gPAM resin with extended shelf life and improved logistics, eliminating the need for hazardous acids and maintaining functional stability as a dewatering and strength additive.
Implementation Method 1
reacting a cationic polyacrylamide (cPAM) prepolymer with glyoxal in an aqueous mixture at low solids and a pH of at least 7.5
Data Source
AI summary
A self-stabilized glyoxalated polyacrylamide (gPAM) resin composition is disclosed. The gPAM resin composition consists essentially of an aqueous reaction product of a cationic polyacrylamide (cPAM) prepolymer and glyoxal carried out in an aqueous reaction mixture having a total solids of less than a critical concentration of the gPAM resin and a pH of at least about 7.5. The cPAM prepolymer comprises a weight average molecular weight (Mw) of at least about 5,000 Da and a cationic monomer content of at least about 4, alternatively at least about 10 mol %. The reaction product is prepared without addition of any acid. The gPAM resin composition maintains a substantially single phase for a stability period of at least about 1 day after preparation, without the addition of any acid or other stabilizing compounds. Methods of preparing and using the gPAM resin composition are also disclosed.