Acylated Polyvinamine Papermaking Additive Process
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Solution Overview
Problem
The existing processes for preparing acylated poly(vinylamine) derivatives are limited by the use of expensive and commercially unavailable monomers, and they often produce by-products, making it difficult to control the acylation ratio and achieve desired properties for papermaking applications.
Innovation Solution
A process involving the reaction of acylating agents such as acetic anhydride or propionic anhydride with poly(vinylamine) to produce acylated poly(vinylamine) derivatives, which offers high reaction efficiency and controlled acylation, using readily available and inexpensive reagents, resulting in polymers with improved chemical and physical properties suitable for papermaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing processes use expensive and commercially unavailable monomers to prepare acylated poly(vinylamine) derivatives, then the desired properties for papermaking applications can be achieved, but the production cost increases and availability decreases
Solution Approach 1:
The patent replaces expensive, commercially unavailable monomers with inexpensive, readily available reagents (acylating agents such as acetic anhydride, propionic anhydride, acetyl chloride, or propionyl chloride) that can be easily obtained. This substitution maintains the desired acylation functionality while dramatically reducing production cost and improving availability for industrial-scale manufacturing.
Solution Approach 2:
The patent changes the chemical parameters of the starting materials from specialized monomers to common acylating agents. This parameter change allows the same acylation reaction to proceed with readily available reagents, achieving the desired poly(vinylamine) derivatives without the constraints of expensive or unavailable monomers.
2Productivity
If existing processes are used to prepare acylated poly(vinylamine) derivatives, then the polymers can be produced, but by-products are generated making it difficult to control the acylation ratio and achieve desired properties
Solution Approach 1:
The patent employs pH monitoring and control during the acylation reaction to achieve precise control over the acylation ratio. By maintaining the reaction pH between 2 and 7, the process ensures complete reaction of the acylating agent with the poly(vinylamine) while minimizing unwanted side reactions, thereby achieving the desired degree of acylation with high precision and minimal by-products.
Solution Approach 2:
The patent controls the reaction pH as a key parameter to optimize the acylation process. By adjusting and maintaining pH within the range of 2-7, the process achieves complete utilization of the acylating agent while preventing hydrolysis and other side reactions, thus precisely controlling the acylation ratio and minimizing by-product formation.
3Productivity
If acylating agents such as acetic anhydride or propionic anhydride are used to react with poly(vinylamine), then reaction efficiency increases and costs decrease, but control over acylation ratio becomes challenging
Solution Approach 1:
The patent controls the reaction pH as a critical parameter to balance reaction efficiency and acylation ratio control. By maintaining pH between 2 and 7 during the reaction with acylating agents, the process ensures high reaction efficiency while precisely controlling the degree of acylation, achieving both high productivity and manufacturing precision.
Solution Approach 2:
The patent uses pH monitoring as a feedback mechanism to control the acylation process. By continuously monitoring and adjusting the pH during the reaction with acylating agents, the process maintains optimal conditions for high reaction efficiency while achieving the desired acylation ratio, thus resolving the contradiction between productivity and precision.
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 process yields acylated poly(vinylamine) derivatives that enhance dry strength, drainage, and retention properties in paper products, providing improved performance as additives in papermaking with reduced costs and minimal by-products.
Implementation Method 1
A process involving the reaction of acylating agents such as acetic anhydride or propionic anhydride with poly(vinylamine) to produce acylated poly(vinylamine) derivatives
Data Source
AI summary
A process for producing an acylated vinylamine-containing polymer is disclosed. The acylated vinylamine-containing polymer is produced by reacting a vinylamine-containing polymer with at one acylating agent.