Amine Accelerator in Decorative Film Adhesive Resin
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Solution Overview
Problem
Conventional decorative films with metallic effects experience quality deviations due to slow urethane reaction in adhesive resins, influenced by environmental factors, leading to inconsistent boil resistance and adhesive strength between the base layer and metal-treated layer.
Innovation Solution
Incorporating an amine accelerator with functional groups such as aziridine and glycidyl amine into the adhesive resin composition to enhance reaction rate and stability, eliminating the need for primer treatment and improving adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive resins (polyester, urethane, ester urethane) are used without accelerator, then the adhesive resin can be applied to metal-coated PET, but the urethane reaction proceeds slowly and is influenced by temperature and humidity, causing quality deviation in boil resistance between and within rolls
Solution Approach 1:
The patent introduces an amine-based accelerator to change the chemical reaction parameters of the urethane system. The accelerator increases the reaction rate constant, transforming the slow, environment-sensitive urethane reaction into a faster, more controllable process that achieves consistent crosslinking and boil resistance across different rolls and storage conditions.
Solution Approach 2:
The amine accelerator acts as an intermediary substance that facilitates the urethane reaction between isocyanate and hydroxyl groups. It provides an alternative reaction pathway with lower activation energy, enabling the adhesive resin to cure reliably at lower temperatures and shorter times, thereby eliminating quality deviations caused by environmental variability.
2Strength
If primer treatment or printing is performed to enhance adhesion between PET and metal deposited layer, then adhesive strength is improved, but process complexity and manufacturing time increase
Solution Approach 1:
The patent extracts and eliminates the separate primer treatment step from the manufacturing process. By incorporating adhesion promoters directly into the adhesive resin composition and using amine accelerator to enhance crosslinking, the system achieves equivalent or superior adhesion strength without requiring additional primer application equipment and process steps.
Solution Approach 2:
The patent merges the adhesion promotion function and the structural adhesive function into a single adhesive resin layer. The amine accelerator enables this multi-functional resin to achieve both strong bonding to metal-coated PET and sufficient structural integrity, thereby consolidating multiple process steps into one application.
3Shape
If hairline pattern is formed on PET surface before primer treatment, then metallic effect is enhanced, but the hairline effect is reduced due to subsequent primer coating
Solution Approach 1:
The patent applies the adhesive resin containing amine accelerator directly to the hairline-patterned metal-coated PET surface without intermediate primer treatment. This preliminary preservation of the hairline surface structure allows the metallic effect to remain visible while the accelerated urethane reaction ensures adequate adhesion strength is achieved in the single adhesive layer.
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 use of an amine accelerator ensures consistent quality and increased reaction rate, reducing quality deviations and enhancing boil resistance between and within rolls, while improving adhesive strength without additional treatment processes.
Implementation Method 1
the amine accelerator may have a functional group reacting with active hydrogen, wherein the active hydrogen may include at least one selected from an OH group, a COOH group, and an NH group
Implementation Method 2
the functional group may include at least one selected from a glycidyl group and an aziridine group
Data Source
Figure 1~3
Figure 4~6
AI summary
The present invention relates to an adhesive resin composition for a decorative film, and to a decorative film including same. In the present invention, an amine-based (including N) accelerator having a functional group which can react with active hydrogen is used for increasing the reaction rate of an adhesive resin which is required for the preparation of a decorative film having a metallic effect, thereby ensuring coating stability and increasing the reaction rate. Thus, according to the present invention, an adhesive resin which has little deviation in quality (boil resistance) between and within rolls can be provided in a short time.