Aqueous Coating Copolymer for Faster Drying Thin Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Water-soluble high polymers, such as N-vinyl carboxylic acid amide monomers, exhibit poor drying efficiency compared to organic solvent-based polymers, leading to prolonged drying times and inefficiencies in applications like lithium-ion battery coatings, where thin film thickness is crucial for weight reduction and energy efficiency.
Innovation Solution
A composition comprising a copolymer of N-vinyl carboxylic acid amide monomer and a monomer of a salt of an unsaturated carboxylic acid, with a specific molar ratio and molecular weight range, is used in an aqueous coating liquid, enhanced with inorganic fillers, to improve drying properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a water-soluble high polymer such as a polymer of a N-vinyl carboxylic acid amide monomer is dissolved in water as solvent, then the coating liquid can be environmentally friendly and safe, but the drying efficiency is very poor compared to organic solvent-based coatings
Solution Approach 1:
The patent changes the chemical parameters of the polymer by introducing a copolymer structure combining N-vinyl carboxylic acid amide monomer units with salt of unsaturated carboxylic acid monomer units. This structural modification alters the polymer's interaction with water, enabling faster drying while maintaining water-based environmental safety. The specific molar ratio range (7.0:93.0 to 93.0:7.0) optimizes this balance between solubility and drying rate.
Solution Approach 2:
The invention creates a composite polymer system by copolymerizing two different monomer types: N-vinyl carboxylic acid amide monomer (providing water solubility and safety) and salt of unsaturated carboxylic acid monomer (providing enhanced drying properties). This composite structure at the molecular level allows the material to exhibit both environmental friendliness and improved drying efficiency simultaneously.
2Use of energy by moving object
If the film thickness of coating substances is reduced for weight reduction and density increase in secondary batteries, then the energy efficiency improves, but the drying rate of water-soluble high polymer coating substances becomes even slower
Solution Approach 1:
The patent modifies the polymer's molecular structure parameters by incorporating salt of unsaturated carboxylic acid monomer units, which changes the drying kinetics of the coating. This parameter change allows thin films to dry faster without requiring higher temperatures or extended drying times, thus maintaining energy efficiency while improving productivity.
3Productivity
If the drying temperature is raised or drying airflow rate is increased to optimize drying conditions, then the drying efficiency improves, but the energy consumption increases and the covering film properties are greatly affected
Solution Approach 1:
The invention changes the chemical parameters of the coating polymer to inherently possess faster drying characteristics. This allows the drying process to proceed efficiently at lower temperatures and lower airflow rates, thereby reducing energy consumption while maintaining good drying efficiency and preserving covering film properties.
4Productivity
If the drying temperature is raised or drying airflow rate is increased to optimize drying conditions, then the drying efficiency improves, but the equipment expenses and energy consumption increase
Solution Approach 1:
By modifying the polymer composition to a copolymer structure, the drying process can be optimized under milder conditions, avoiding the need for expensive high-temperature drying equipment or high-power airflow systems. This parameter change at the material level translates to reduced equipment complexity and lower capital expenses.
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 copolymer composition significantly reduces drying time, allowing for efficient coating processes with improved film thickness and energy efficiency, while maintaining coating quality and stability.
Implementation Method 1
the drying efficiency is often very poor as compared to the case where an organic solvent is used as resolvent
Implementation Method 2
a copolymer of a N-vinyl carboxylic acid amide monomer and a monomer of a salt of an unsaturated carboxylic acid
Data Source
AI summary
To provide an aqueous composition for aqueous coating that contains a polymerized substance of a N-vinyl carboxylic acid amide and that dries efficiently when used to produce a coating substance. A composition for aqueous coating liquid, comprising at least a copolymer of a N-vinyl carboxylic acid amide monomer and a monomer of a salt of an unsaturated carboxylic acid, and water, in which the molar ratio between the N-vinyl carboxylic acid amide monomer and the monomer of a salt of an unsaturated carboxylic acid is 7.0:93.0 to 93.0:7.0, and the weight-average molecular weight of the copolymer is 15,000 to 2,500,000.