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Shinray Chemical and Jiuri Chemical took the lead in implementing microchannel continuous mass production of 651 to replace traditional batch reactor processes:
1. Main product content increased from conventional 99.2% to ≥99.55%, with residual conventional by-product benzil reduced from ≤0.3% to ≤0.08%;
2. Overall product yield rose from 85% under traditional processes to 92.3%, cutting raw material loss per ton by 7.8%;
3. Melting range narrowed to 64.3–65.8°C with a melting interval ≤1.5°C, reducing batch melting point fluctuations by 70% and resolving unstable feeding pain points for overseas end-users with different formulation systems.
Procurement Benefits: Downstream manufacturers require no additional repurification; the 651 addition ratio per ton of resin formulation can be reduced by 0.2–0.3 percentage points, lowering raw material procurement costs by 4%–6%.
Shinray Chemical mass-produced UV651-M microcapsule modified grade in 2024, with five leading domestic manufacturers rolling out compatible coating improvement processes simultaneously:
1. Post-curing precipitation of small benzophenone molecules fell from conventional 3–5ppm to <0.1ppm (below instrument detection limits), with the full product line passing EU EN13130 food contact ink certification and US FDA food packaging specifications;
2. Light-proof room-temperature shelf life extended from 6 months to 12 months, with room-temperature storage yellowing rate reduced by 85%.
Procurement Benefits: Direct applicability for food flexible packaging UV inks and infant paper coatings eliminates the need for purchasers to switch to high-end low-migration alternative photoinitiators, unlocking high-value food packaging end-product orders; cargo loss during long-distance ocean shipping stockpiling drops by 90%.
Sanmu Chemical and Shunbang Chemical iterated refining processes to optimize toluene solution light transmission indicators:
1. 425nm light transmittance increased from 93% to ≥95.8%, with 450nm transmittance ≥97.2%, resolving the traditional 651 defects of poor shortwave light transmission and incomplete blue light curing;
2. Ash content ≤0.03% (national standard ≤0.1%) and moisture ≤0.15% eliminate white spots and pinhole defects in 3D photosensitive resin curing.
Procurement Benefits: Desktop SLA/DLP 3D printing resins can use 651 alone as a replacement for high-priced compound photoinitiators, cutting end-product resin production costs by 12%–18% and supporting mass orders for European and American consumer-grade 3D printing consumables.
Jingjiang Hongtai upgraded full production line recrystallization processes: product thermal weight loss (volatile fraction) dropped from 0.35% to ≤0.12%, meeting new EU 2025 UV coating VOC limit regulations; uniform crystal particle distribution reduced powder dust emission by 62%.
Procurement Benefits: Overseas coating factories lower waste gas treatment costs without installing extra volatile removal supporting equipment, enabling smooth customs clearance under the latest EU REACH controls.
The new-generation Omnirad 651-LT low-temperature low-yellowing modified grade launched in 2025:
1. Under identical UV photoinitiator dosage, coating yellowing index ΔE decreased from 3.2 to ≤1.1, resolving the chronic yellowing defect of traditional 651 in outdoor coatings under long-term sunlight exposure;
2. Curing activity at low temperatures (5°C) increased by 22%, compatible with low-temperature spraying production lines in Northern Europe.
Procurement Benefits: Outdoor wood coatings and metal coil coating end-users eliminate the need for supplementary anti-yellowing additives, simplifying formulations and cutting finished product reject rates.
Two overseas manufacturers launched liquid pre-dispersed 651 (dissolved in active monomers) in 2025:
1. Direct miscibility with acrylic resins at room temperature eliminates solid powder heating and dissolving procedures, shortening dissolving time from 2 hours to 15 minutes;
2. Complete elimination of system agglomerated particles reduces reject rates from adhesive wire drawing and particle defects by 95%.
Procurement Benefits: Automated continuous production line factories boost feeding efficiency and reduce environmental fines from powder feeding dust emissions.
Two compound grades combining 651 + thioxanthone new products deliver 30% deeper curing depth under identical addition ratios, resolving incomplete penetration curing for thick-wall UV adhesives (≥2mm) and raising mass production yield rates for thick-film coatings.
Procurement Benefits: Purchasers of thick-layer epoxy UV adhesives and electronic potting adhesives eliminate in-house compounding of multiple photoinitiators, streamlining inventory SKUs and cutting warehouse capital occupation.
1. Compliance Benefits: Domestic modified 651 full product line achieves food-grade certification, drastically lowering market access thresholds for overseas packaging and medical consumable end-products, enabling purchasers to develop high-value food ink orders.
2. Cost Benefits: Domestic process upgrades reduced ex-factory prices by 8%–12% compared to 2023; terminal raw material total costs decline when benchmarked against imported high-end grades with equivalent indicators.
3. Application Benefits: Blue light compatibility upgrades unlock new markets for 3D printing and LED-UV curing; existing 651 inventory held by purchasers can seamlessly switch to LED light source production lines without full replacement of high-end photoinitiators.
4. Risk Control Benefits: Upgraded storage stability and low volatility drastically reduce cargo loss risks during cross-border ocean transportation and non-compliance risks during overseas customs environmental sampling inspections.
For more comprehensive and valuable market information about UV 651, please contact HiSiaddi customer service.
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