Aqueous Resin Composition Segmentation for Durability
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Solution Overview
Problem
Aqueous resin compositions used in digital printing lack durability, particularly in terms of water resistance, heat resistance, and solvent resistance, and face challenges with liquid stability during transportation, storage, and repeated use, leading to inefficiencies and economic waste.
Innovation Solution
An aqueous resin composition comprising a polyurethane resin with a carboxylate group, a crosslinking agent with multiple carbodiimide groups, and a surfactant, where the molar ratio of carbodiimide groups to carboxylate groups is optimized, along with an amine compound, to enhance crosslinking and maintain fluidity and adhesiveness even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crosslinking action is caused on the coated layer after coating to improve water resistance and solvent resistance, then durability is improved, but liquid stability during transportation and storage deteriorates
Solution Approach 1:
The invention divides the aqueous resin composition into two separate bottles: one containing the resin component and another containing the crosslinking agent component. This segmentation prevents premature crosslinking during transportation and storage, maintaining liquid stability, while allowing crosslinking to occur after coating to improve durability.
Solution Approach 2:
The invention performs preliminary separation of the resin and crosslinking agent into different containers before use. This preliminary action ensures that the crosslinking reaction is delayed until the coating is applied and dried, at which point the crosslinking agent is added to achieve the desired durability without compromising liquid stability during storage and transport.
2Stability of the object's composition
If resin component and crosslinking agent component are separated to form two-liquid type to improve liquid stability during transportation and storage, then liquid stability is improved, but the liquid after use cannot be repeatedly used when liquid stability after mixing is insufficient
Solution Approach 1:
The invention optimizes the parameters of the aqueous resin composition, including the type of resin, molecular weight, and additives, to ensure that the composition maintains liquid stability after mixing and can be repeatedly used. The specific parameter optimization allows the composition to achieve both liquid stability during storage and reusability after use.
3Ease of operation
If a one-liquid type is used in which resin component and crosslinking agent component are mixed in advance, then ease of operation is improved, but liquid stability is difficult to maintain under high temperature condition of 40°C or higher
Solution Approach 1:
The invention segments the resin and crosslinking agent into separate bottles, which simplifies the storage and handling process while preventing premature crosslinking. This segmentation maintains liquid stability under high temperature conditions during storage and transportation, while still providing ease of operation by allowing simple mixing after coating application.
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 composition achieves satisfactory durability, image quality, and liquid stability, preventing odor emission and ensuring adhesiveness and fluidity over time, even under high temperature conditions, thereby improving the performance and reuse of the resin composition.
Implementation Method 1
a crosslinking agent that contains at least two or more carbodiimide groups in one molecule... wherein a molar ratio of the carbodiimide groups contained in the crosslinking agent to the carboxylate group contained in the polyurethane resin is 0.1 or greater and 5.0 or less
Data Source
AI summary
An aqueous resin composition including at least: a polyurethane resin that contains a carboxylate group; a crosslinking agent that contains at least two or more carbodiimide groups in one molecule; and a surfactant, wherein a molar ratio of the carbodiimide groups contained in the crosslinking agent to the carboxylate group contained in the polyurethane resin is 0.1 or greater and 5.0 or less, and the aqueous resin composition further contains an amine compound having a pkb of 3.5 or greater and 4.7 or less.