KDD PU2501 Water‑based Polyurethane Resin-High VOC, Low Peel Strength & Poor Water Resistance in Conventional PVC Hot‑Laminating Inks| Special Polyurethane Resin Solution for Water-Based Hot Laminating Inks for PVC Wallpaper/Decorative Films

I. Application Scenarios

Applicable Products: PVC wallpaper ink, water-based hot laminating ink for PVC decorative films, PET film printing water ink, paper composite printing ink, serving as the main binder for inks.

Applicable Working Conditions: Gravure and flexographic roll-to-roll water-based printing, hot air drying after printing followed by hot press lamination processing; continuous roll-to-roll mass production of wallpaper and decorative films; finished products used in indoor high-humidity and water vapor contact environments for a long time; compliant with export low VOC environmental control production requirements.

Core Demands and Industry Pain Points:

1. Traditional solvent-based PVC hot laminating inks have high VOC content and strong odor, with flammable and explosive risks, failing to meet export environmental protection standards such as RoHS and REACH;

2. Inks prepared with ordinary water-based resins suffer from low hot press peeling strength after lamination, prone to delamination, layer separation and ink transfer, resulting in finished product scrapping;

3. Conventional water-based inks have inadequate water resistance. When used in humid environments for wallpaper and decorative films, the ink layer is prone to whitening, blistering and fading, failing to meet the quality requirements for interior home decoration;

4. Plasticizers inside PVC substrates tend to migrate, causing reduced adhesion of ordinary water-based inks and subsequent ink falling and fastness degradation;

5. Some water-based PU emulsions have high viscosity, leading to poor on-machine printability, prone to plate clogging and leveling defects, and are not suitable for high-speed roll production lines.

II. Core Technical Solution

1. Applicable Substrates: PVC films, PVC wallpaper, PET films, paper and laminated paper products

Developed specifically for PVC and PET substrates, it serves as an ink binder that endows inks with high hot lamination strength and excellent water resistance.

2. Curing and Baking Conditions: Hot air drying at 60℃ for 3-5 minutes (moisture volatilization and film formation, followed by hot press lamination process)

3. Key Performance

Flexibility: The polyurethane molecular chain has good flexibility, preventing cracks and fractures in the ink layer during rolling and bending of coiled materials, adapting to repeated curling deformation of wallpaper and decorative films.

Adhesion: It exhibits excellent wetting and adhesion to PVC and PET substrates, resists damage caused by PVC plasticizer migration, and prevents ink layer falling off after printing and hot press lamination.

Abrasion Resistance: Dense film formation prevents fading and scratching during handling, slitting and friction of finished products, meeting the abrasion resistance requirements of post-processing procedures for wallpaper and decorative films.

III. Solution Comparison

IV. Clear Conclusions and Selection Recommendations

PU2501 is a water-based polyurethane dispersion binder developed by KDD for PVC hot laminating inks and PVC wallpaper water-based inks. It effectively solves the safety and environmental pressure caused by high VOC of traditional solvent-based inks, and improves the industry pain points of ordinary water-based inks such as insufficient hot press peeling strength, poor water resistance and ink falling caused by plasticizer migration. It balances printing process performance, finished product moisture resistance and bending resistance, adapts to roll printing of wallpaper and decorative films, and meets industry standards and export environmental protection requirements.

Selection Recommendations:

1. PU2501 is the preferred main binder for water-based hot laminating inks of PVC wallpaper and PVC decorative films, and can also be applied to PET film printing water-based inks;

2. It is recommended to fully remove moisture via 60℃ hot air drying; direct hot press lamination with incompletely volatilized moisture will cause poor lamination and tackiness defects;

3. It can be compounded with other water-based emulsions to adjust cost and performance; full-process reliability verification including printing, hot press lamination and water resistance must be completed before mass production;

4. Store in a sealed environment at 2-36℃, avoid freezing and direct sunlight exposure; the product shelf life is 6 months.

V. Enterprise Professional Endorsement

KDD specializes in the R&D and application of water-based polyurethane dispersions, acrylic functional resins and printing ink binders. We have mature processes and practical application cases, and can provide customized formula design, sample testing and batch supporting services to meet industry standards and export requirements.

VI. FAQ

1. Q: Can the hot press lamination strength of water-based inks formulated with PU2501 be comparable to that of traditional solvent-based inks?

A: With a reasonable formula design and sufficient drying after printing, PU2501 can achieve high hot press peeling strength equivalent to that of solvent-based inks. It is essential to ensure complete volatilization of moisture after printing, as residual moisture will directly reduce the hot press lamination strength.

2. Q: How does PU2501 address PVC substrate plasticizer migration when used in PVC wallpaper inks?

A: The polyurethane structure of PU2501 has good tolerance to plasticizers, which can slow down the damage of plasticizer migration to ink layer adhesion. It is recommended to match with appropriate additives to further improve migration resistance, and complete accelerated aging verification before mass production.

3. Q: What are the storage precautions for PU2501? Will demulsification occur?

A: PU2501 should be hermetically stored at 2-36℃, strictly avoiding freezing and direct sunlight. The shelf life is 6 months from the production date. Once demulsification occurs due to freezing, the product cannot be used in production.