In the field of UV-cured materials, tetrahydrofurfuryl acrylate (THFA) is widely used due to its excellent adhesion and rapid curing properties. However, the pungent odor and skin sensitization risks associated with THFA, along with its high curing shrinkage rate, have long been a pain point in the industry. CPD-U201L-THFEOA (ethoxytetrahydrofurfuryl acrylate), as a modified version of THFA, introduces an ethoxy chain segment precisely. This not only retains the core advantages but also achieves multi-dimensional performance upgrades, making it an ideal choice for low-irritation, high-reliability photopolymerization systems.
I. Core Advantages: Breakthrough from “Usable” to “Good Use”
Less Stimulation, Safer
• THFA residue <1%, reducing irritants at source.
• Skin irritation plummet: the primary stimulus index (PII) is only 0.5~1.5 (THFA is 5.0~8.0), which is “mild stimulation” level, and the construction environment is more friendly.
• The smell has been greatly improved: only two out of 50 people in the sensory test can perceive a slight smell, saying goodbye to the traditional “stingy trouble”.
Comprehensive Performance Optimization
• Low shrinkage x high flexibility: curing shrinkage rate of 7.13% (THFA is 12.04%), flexible substrate suitable for bending without cracking.
• Super adhesion: tetrahydrofuran ring has swelling effect on PC, PET and other plastics. The adhesion of 100g test is grade 0 (no peeling), which can easily deal with difficult to stick materials.
• Weathering and durability: low Tg (-34.7℃) anti-cryogenic embrittlement, resistant to wet heat aging, long-term use does not yellow, does not fall off.
2. Key Performance Parameters: Compared with THFA, the Advantages are Obvious
| project | U201L-THFEOA | THFA(U156-THFA) | Core differences |
| THFA content | ＜1% | ＞98.5% | Allergenic raw materials have been significantly reduced |
| Viscosity (25℃, mPa·s) | 10.24 | 2.97 | Construction viscosity suitable for inkjet/coating process |
| Solidification shrinkage | 7.13% | 12.04% | The contraction is reduced by 41%, reducing internal stress |
| Glass transition temperature (Tg) | -34.7℃ | -21.4℃ | Low temperature and toughness are stronger |
| Surface tension (mN/m) | 37.3 | 35.6 | Consider the wetting properties of the substrate |
Third, Multiple Application Scenarios: “all-round players” in High Value-added Fields
1. Light-curing adhesive
• Precision electronic bonding: 5G LCP antenna, flexible OLED packaging, low shrinkage stress to avoid chip / screen interface cracking.
• Severe environment application: automotive lampshade, aerospace composite materials, low temperature resistance (-40℃), anti-vibration, the rubber layer keeps elastic for a long time.
2. UV ink and coating
• Digital printing: PC/PET digital direct inkjet, strong adhesion and fold resistance, to meet the needs of personalized customization.
• Environmental compliance: VOC evaporation is much lower than THFA, in line with the GB 38507 ink VOC limit standard, to facilitate green production.
3. Flexible optoelectronic devices
• Wearable devices: stretchable sensors, smart textile coatings, low Tg (-34.7℃) resistance to repeated bending fatigue.
• Optical packaging: Refractive index (1.4602) matches ITO glass to reduce interface reflection and improve OLED display efficiency.
4. Formula reference: easy to mix, suitable for a variety of systems
Take UV ink as an example, the basic formula (mass percentage):
• Main body monomer: U201L-THFEOA 45%
• Functional monomer: TPGDA/TMPEO3TA 30% (enhance reaction activity)
• Oligomer: aliphatic polyurethane acrylate 5%
• Photoinitiator: TPO 8% + ITX 2% (optimized curing efficiency)
• Auxiliaries: dispersant, wetting agent, pigment and so on 20%
• Advantages: no irritating odor, viscosity of 17.4 mPa・s, suitable for piezoelectric nozzle, and the folding resistance and hardness are both at the excellent level of the industry after curing.
5. Tips for use: The key to optimal performance
1. Compound optimization: If higher crosslinking density is required, TMPTA and other multifunctional monomers can be added, or DETX and other photoinitiators can be used.
2. Process adjustment: the energy demand of surface drying is slightly higher (374 mJ/cm²), and it is suggested to use dynamic light intensity control to achieve deep curing.
3. Compliance first: Ensure that the formula complies with the environmental regulations of the target market.
Epilogue
CPD-U201L-THFEOA, with its characteristics of “low irritation, low shrinkage, and high compatibility,” not only addresses the pain points of traditional THFA but also opens up advanced application scenarios such as flexible electronics and precision bonding. Whether it’s processing companies that prioritize construction safety or brands requiring compliant and high-performance solutions, this “upgraded version” monomer will become a “plus point” in the formulation of light-curing materials.
Consult technical details immediately to unlock new solutions for low-stimulus light curing
(Note: The data in this article is based on laboratory tests. Please verify the actual application according to the scenario.)
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