Polyester Printing Pretreatment Composition for Stronger Ink Adhesion
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Solution Overview
Problem
The adhesiveness of images recorded using inks containing a colorant and water on polyester base materials is insufficient, as observed in existing techniques.
Innovation Solution
A printing pretreatment liquid containing a polymer with a Hansen solubility parameter value of 18 MPa 0.5< to 30 MPa 0.5< and an aggregating agent such as a polyvalent metal salt, dicarboxylic acid, or cationic compound is used to enhance adhesiveness between the polyester base material and the image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional printing pretreatment liquids are used on polyester base materials, then the processing is simple, but the adhesiveness of the recorded image is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the pretreatment liquid by specifying polymers with particular Hansen solubility parameters (δ1: 1.5-6.0, δ2: 3.5-8.0, δ3: 7.0-12.0) and molecular weights (10,000-1,000,000), along with controlled amounts of surfactants (0.1-10 mass%) and pH adjusters (pH 2-7), to optimize adhesiveness to polyester substrates
Solution Approach 2:
The patent creates a composite pretreatment liquid system combining multiple components: polymers with specific solubility characteristics, aggregating agents, surfactants, and pH adjusters, where each component contributes to overall adhesiveness and compatibility with both polyester substrate and ink composition
2Strength
If the polymer molecular weight is increased to improve adhesiveness, then the bonding strength improves, but the viscosity of the pretreatment liquid increases making application difficult
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polymer within the range of 10,000-1,000,000, balancing adhesiveness (which improves with higher molecular weight) against viscosity and processability (which deteriorate with higher molecular weight), achieving optimal performance at moderate molecular weights
3Strength
If the Hansen solubility parameters of the polymer are optimized to improve image adhesion, then the adhesiveness improves, but the selection and synthesis of suitable polymers becomes more complex
Solution Approach 1:
The patent establishes specific ranges for Hansen solubility parameters (δ1: 1.5-6.0, δ2: 3.5-8.0, δ3: 7.0-12.0) that provide optimal balance between adhesiveness to polyester and compatibility with aqueous ink, simplifying polymer selection by providing clear numerical criteria rather than requiring extensive trial and error
Solution Approach 2:
The patent selects polymers with Hansen solubility parameters that create homogeneity in the interface between pretreatment liquid, polyester substrate, and ink composition, ensuring uniform adhesion across the entire system without phase separation or incompatible interactions
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 improves the adhesiveness of images formed using inks containing a colorant and water on polyester base materials, resulting in enhanced image quality and stability.
Implementation Method 1
a polymer which has a Hansen solubility parameter value of 18 MPa 0.5< to 30 MPa 0.5<
Implementation Method 2
a printing pretreatment liquid that contains a polymer and an aggregating agent
Implementation Method 3
an aggregating agent such as a polyvalent metal salt, dicarboxylic acid, or cationic compound
Data Source
Figure 1
Figure 2~3
AI summary
Provided are a printing pretreatment liquid for a polyester base material including a polymer which has a Hansen solubility parameter value of 18 MPa0.5 to 30 MPa0.5, water, and at least one aggregating agent selected from the group consisting of a polyvalent metal salt, an organic acid, a cationic compound, and a metal complex, and applications thereof.