Polyolefin-Polyether Resin Dispersion for Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing aqueous resin dispersions for polyolefins face issues with poor water resistance, chemical resistance, and appearance failures due to surfactant bleeding, and limited coating methods, particularly in roller coating and dip coating, which require additional anti-blocking or wetting agents.
Innovation Solution
An aqueous resin dispersion is developed by bonding polyolefins with polyether resins having specific HLB values and molecular weights, allowing for improved blocking resistance and wettability without the need for surfactants or additional agents, enabling easy application via various coating methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If surfactants are used to disperse resin in water, then the resin can be rendered aqueous, but water resistance and chemical resistance deteriorate and surfactant bleeding causes appearance failures
Solution Approach 1:
The patent uses a hydrophilic polymer as an intermediary substance to enable aqueous dispersion of the polyolefin resin without requiring surfactants. The hydrophilic polymer bonds to the polyolefin resin through reactive groups, creating a composite structure where the hydrophobic polyolefin provides water/chemical resistance while the hydrophilic polymer provides water dispersibility. This intermediary approach eliminates surfactant-related issues while maintaining both reliability and ease of operation.
Solution Approach 2:
The invention creates a composite material system consisting of polyolefin resin bonded with hydrophilic polymer. This composite structure combines the advantageous properties of both components: the polyolefin resin contributes water resistance, chemical resistance, and mechanical properties, while the hydrophilic polymer provides aqueous dispersibility. The composite material approach resolves the contradiction by integrating multiple functions within a single dispersed particle system.
2Reliability
If hydrophilic polymer is added to polyolefin to create aqueous dispersion without surfactant, then water resistance improves, but blocking resistance and wettability deteriorate
Solution Approach 1:
The patent optimizes specific parameters of the hydrophilic polymer to balance water resistance with blocking resistance and wettability. Key parameters include selecting polymers with specific HLB values (5-20), molecular weights (1,000-100,000), and hydroxyl values (10-100 mg KOH/g). By precisely controlling these parameters, the invention achieves a balance where the hydrophilic polymer provides sufficient water dispersibility while maintaining adequate blocking resistance and wettability for coating applications.
Solution Approach 2:
The invention creates local quality differentiation within the dispersed particle structure. The polyolefin resin core maintains water resistance and chemical resistance, while the bonded hydrophilic polymer surface provides water dispersibility and improved wettability. This local quality approach allows different regions of the dispersed particle to fulfill different functional requirements, resolving the contradiction between water resistance and coating performance.
3Ease of operation
If modified polyolefin resin is used to improve coatability and adhesiveness, then coating performance improves, but the requirement for additional agents increases process complexity
Solution Approach 1:
The patent merges multiple functions into a single modified polyolefin resin component. The resin is simultaneously modified with (1) hydrophilic polymer for aqueous dispersibility, (2) reactive groups for bonding capability, and (3) appropriate HLB value for wettability. This consolidation eliminates the need for separate surfactants, bonding agents, and wetting agents, reducing process complexity while maintaining improved coatability and adhesiveness.
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 solution provides excellent blocking resistance and wettability, preventing appearance failures and allowing for broader application ranges without surfactant-related issues, enhancing the coating process and product quality.
Implementation Method 1
a polymer (C) obtained by bonding a polyolefin (A) to a polyether resin (B) is dispersed in water
Implementation Method 2
the polyether resin (B) contains a polyether resin (B1) having an HLB of less than 8 and a polyether resin (B2) having an HLB of 8 to 20 according to calculation by the Griffin method
Data Source
AI summary
An aqueous resin dispersion wherein a polymer (C) obtained by bonding a polyolefin (A) to a polyether resin (B) is dispersed in water; and the polyether resin (B) contains a polyether resin (B1) having an HLB of less than 8 and a polyether resin (B2) having an HLB of 8 to 20 according to calculation by the Griffin method.