As a new-type foreign trade service provider driven by both technological transformation and export business, HiSiaddi has built a "1+2+3+4=1" service system and can supply photoinitiator 651 sourced directly from multiple well-known original manufacturers. Boasting R&D capabilities, HiSiaddi has collaborated with manufacturers on technological transformation and accurately captured market demands, repeatedly solving customized product requirements for photoinitiator 651. Below is a case of HiSiaddi addressing customized demands for photoinitiator 651.
Please contact HiSiaddi customer service if you require customized service solutions.
Purchaser: FRANCE ELEC UV SAS (France Elec New Materials), located in Lyon, France. With 27 years of R&D and production experience focusing on high-end UV sealants for electronic components, UV coatings for optical lenses, and photosensitive inks for PCB circuits, its products are supplied to top European automotive electronics and precision optical brands. The company purchases 52 tons of Irgacure 651 from BASF all year round. Faced with price hikes and extended lead times of up to 90 days from the European original supplier, the client planned to customize a special grade of domestically produced 651, rejecting standard industrial off-the-shelf products available on the market. Four strict customized indicators were put forward for optical adhesive production, all unachievable by conventional domestic standard-grade 651:
1. Ultra-high purity: GC content ≥99.85%, single impurity ≤100ppm; conventional national standard products only reach ≥99.0% with high by-product content.
2. Ultra-low solvent residue: Total residue of methanol and benzene-based solvents ＜50ppm; ordinary mass-produced 651 generally has residue ranging from 300 to 800ppm, causing foggy spots on adhesive layers.
3. Improved low yellowing performance: Optimized refining process to significantly inhibit long-term thermal yellowing of cured coatings; conventional 651 tends to yellow after prolonged heating post-curing, making it unsuitable for transparent optical components.
4. Ultra-fine crystal particle size: D50 ≤4μm, loose powder with excellent solubility to avoid caking and precipitation in inks; general products feature coarse grains with slow dissolution rates.
The client previously contacted three major domestic 651 manufacturers, all of whom could only supply standard national standard products. Restricted by existing synthesis and recrystallization production lines, manufacturers refused to carry out independent technical transformation for refined customization. Multiple small-batch sample tests resulted in defects including coating yellowing, tiny white spots and incomplete dissolution, halting the customization project for nearly 40 days. Recommended by the French Chemical Association, the client entrusted HiSiaddi with full overall coordination of formula improvement, process customization and pilot mass production implementation.
Working with R&D engineers from a leading domestic designated photoinitiator factory, HiSiaddi carried out targeted modifications to four core processes: impurity control during synthesis, multi-stage recrystallization, low-temperature negative pressure drying and airflow pulverization, and implemented customized parameters item by item.
Adjust the molar ratio of benzil and sodium methoxide, and conduct segmented temperature-controlled ketalization reactions to reduce isomer impurity generation, controlling by-product content at the source and lowering subsequent purification pressure.
Abandoning the industry’s single ethanol one-step rough purification process, ethanol-isopropanol composite solvents are adopted for three-stage temperature-lowering recrystallization to separate colored impurities and unreacted raw materials layer by layer. The product purity was lifted to 99.88%, with single impurity controlled within 72ppm, meeting the ultra-high purity requirements.
Conventional hot air drying equipment was replaced with closed low-temperature negative pressure drying units to remove residual organic solvents at low temperatures. The measured total solvent residue of finished products reached 36ppm, far below the client’s critical limit of ＜50ppm, eliminating foggy spot defects in adhesive liquid.
Crystallized finished products undergo inert gas-protected low-temperature airflow pulverization and sieving classification, yielding finished products with D50 ranging from 3.2 to 3.8μm. The loose powder dissolves rapidly in acrylic resin at room temperature, resolving caking and precipitation issues. Meanwhile, the refined formula was slightly adjusted to reduce trace yellowing-causing impurities. Accelerated aging testing of optical coatings at 85℃ for 72 hours demonstrated far superior yellowing index compared to standard 651, fulfilling the low-yellowing customization target.
1. Laboratory sample inspection: HiSiaddi delivered 5kg customized samples. The client formulated optical UV adhesives with the samples, producing transparent coatings free of white spots or initial yellowing, with curing speed matching original BASF 651. All physical and chemical indicators fully met standards.
2. Factory pilot mass production: A customized 500kg pilot batch was scheduled at the factory, with full-process central control testing tracking by HiSiaddi, yielding stable batch data without fluctuations. The client ran 24-hour continuous production of optical lens coatings on workshop equipment without abnormalities, and finished products passed incoming material inspection by downstream automotive optical manufacturers.
3. First customized order confirmation: A 16-ton batch of customized grade 651 was finalized. HiSiaddi supplied EU REACH-SDS, CLP compliant labels and third-party CNAS test reports, alongside customized light-proof moisture-neutral export packaging, shipped directly from Shanghai Port to Marseille Port, France.
1. Cost and lead time optimization: The comprehensive procurement cost of customized domestic 651 decreased by 29% compared to original BASF products, while the total lead time covering production and ocean freight was shortened to 28 days, significantly cutting the client’s raw material inventory pressure.
2. Annual customized framework agreement signed: After acceptance of the first batch, a yearly 52-ton customized supply agreement was signed with monthly split production scheduling.
3. Extended customized new product development: When the client developed high-transmittance UV coatings for automotive lenses, they continued to entrust HiSiaddi with developing modified compound grades of 651.
4. Upstream factory product line upgrade: Leveraging the customized process from this project, the factory finalized a special high-purity electronic optical grade 651 specification. With HiSiaddi’s support, the factory secured orders from two leading European optical adhesive manufacturers in Spain and Belgium.
1. Domestic 651 products are divided into two tiers: standard industrial grade and electronic high-purity customized grade. Most mass production lines cater to inks and general coatings with fixed processes that only meet basic national standard indicators. Faced with high-end customization demands from European optical and electronic sectors requiring low residue, low yellowing and ultra-fine particle size, manufacturers lack incentives for technical transformation, leading to frequent setbacks for overseas clients conducting independent selection and customization.
2. Core Value of HiSiaddi: Bridge customized terminal parameters and production-side process modifications, forming a full industrial chain covering formula optimization, refined technical transformation, graded pulverization, sample verification and compliant export, filling the service gap between overseas high-end clients and domestic auxiliary manufacturers for customized solutions.
3. Mid-to-high-end procurement by European and American electronic optical clients prioritizes practical performance delivery of customized products. Integrated customization plus export supporting services constitute the core competitive advantage distinguishing professional service providers from general spot trading merchants.
Please contact HiSiaddi customer service for more customized service solutions.
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