HiSiaddi is an innovative foreign trade service provider driven by both technology commercialization and foreign trade. We have established a "1+2+3+4=1" service system and can supply TMPTA (trimethylolpropane triacrylate) sourced from multiple well-known original manufacturers.
As a technology-driven foreign trade enterprise with R&D capabilities, HiSiaddi has repeatedly collaborated with factories on technology conversion and accurately captured market demands, enabling us to propose TMPTA formulation optimization schemes and application improvement recommendations. Below is a case study of HiSiaddi’s TMPTA formulation optimization consulting service.
Contact HiSiaddi customer service for more formulation optimization consulting services.
The cooperating customer is INCO Ink GmbH based in Munich, Germany, a leading mid-to-high-end European UV ink enterprise. Its products cover PCB solder mask ink, automotive touch panel varnish, and food-contact tobacco package varnish, with supporting clients including Bosch and Siemens, and compliance with multiple stringent standards including LFGB, REACH, and VDE. It is a high-end fine chemical end producer.
Previously, the customer sourced customized high-purity domestic TMPTA via HiSiaddi under a 320-ton annual framework agreement. The first batch of 38 tons passed all physical and chemical testing and SGS inspections, with parameters fully comparable to original Sartomer imported products. The customer directly applied its mature multi-year formulas and curing processes to production, yet three production lines consecutively experienced failures half a month later: sticky PCB ink surfaces prone to wiping powder, yellowing of transparent varnish after high-temperature aging, and dense tiny pinholes on precision circuit board coatings. All finished product inspections failed, prompting downstream major clients to suspend goods receipt and forcing two production lines to reduce output, with daily losses exceeding 12,000 EUR. The customer’s R&D team repeatedly adjusted monomer, photoinitiator, and curing power dosages yet failed to balance hardness and curing performance. Domestic monomer manufacturers only possessed synthesis and production expertise without ink application experience and could not troubleshoot operational issues. The customer urgently commissioned HiSiaddi to conduct on-site technical troubleshooting.
HiSiaddi operates as a technology-focused foreign trader with technical reserves covering three fields: UV monomer synthesis, ink formulation, and curing processes. We are familiar with subtle differences in activity, trace impurities, and molecular polarity between domestically-produced distilled TMPTA and imported European and American raw materials, enabling rapid differentiation between raw material quality defects and formula adaptation issues. We deliver low-cost rectification solutions via formula and process adjustments supported by technical expertise.
HiSiaddi conducted parallel testing of the domestic customized TMPTA and imported original samples, confirming the raw material quality was qualified. Defects stemmed from incompatibility of the original formula and process with physical property differences:
1. Sticky surface caused by divergent curing activity: The domestically-produced TMPTA underwent three-stage precision distillation with high purity and uniform polymerization activity, exhibiting faster overall reaction rates than imported grades. The original formula and UV power were designed for low-activity imported monomers, resulting in oxygen-inhibited uncured surfaces and excessive internal crosslinking, manifesting as sticky coatings prone to powdering upon wiping.
2. Yellowing triggered by structural differences in trace by-products: Trace residues in imported TMPTA consist of stable long-chain esters, while refined domestic grades contain small amounts of short-chain acrylic small molecules with weaker heat resistance. The customer’s original post-curing baking temperature was excessively high, leading to thermal oxidation of small molecules and yellowing of transparent varnish during long-term storage.
3. Pinholes induced by polarity mismatch: The high-purity domestic TMPTA has slightly higher polarity than imported grades. The flow and defoamer dosages in the original formula were calibrated for low-polarity raw materials; excessive auxiliary agents degraded system compatibility, trapping micro air bubbles during high-speed mixing that formed pinholes post-curing.
1. PCB solder mask ink: Reduce TMPTA dosage from 12.5 parts to 11.2 parts to eliminate excessive monomer-induced over-crosslinking; cut 0.3 parts of 1173 photoinitiator, slightly supplement TPO paired with amine co-initiators to resolve surface oxygen inhibition and eliminate stickiness entirely.
2. Automotive transparent varnish: Lower TMPTA from 10.8 parts to 9.8 parts, add 0.25 parts of dedicated antioxidant stabilizer, and streamline redundant leveling agents to boost thermal yellowing resistance of the system.
3. Food-grade tobacco package varnish: Fix TMPTA dosage at 10 parts and fine-tune resin ratios to enhance overall compatibility while maintaining LFGB compliance.
1. UV curing: Reduce curing lamp power from 800W to 720W and adjust production line speed from 6m/min to 5.2m/min to slow curing rhythm and achieve synchronized internal and surface crosslinking.
2. Post-baking: Revise parameters from 185℃/25min to 172℃/30min for low-temperature slow maturation to avoid thermal oxidation yellowing of small molecules at high temperatures.
3. Ink preparation process: Lower dispersion speed from 1200r/min to 950r/min and extend vacuum defoaming duration to 8 minutes to reduce trapped air bubbles and eliminate pinholes.
HiSiaddi compiled a bilingual German-English operation manual mandating sealed light-proof storage of TMPTA at a constant 22–26℃, full consumption within 10 days after opening, and unified batching and blending standards across all three production lines to eliminate fluctuations from manual operation.
Small trials of the optimized formulation passed all 200-hour high-temperature aging, yellowing resistance, and adhesion tests. Continuous 72-hour pilot production raised the finished product yield from 71.3% to 99.8%. Re-inspected finished products passed Germany VDE and LNE testing, prompting Bosch and Siemens to resume goods acceptance. The full-year 320 tons of TMPTA were delivered monthly as scheduled. Localized sourcing reduced costs by 33% compared with imports and drastically shortened delivery cycles. Later, the customer developed low-temperature LED-curable ink and once again commissioned HiSiaddi to customize modified TMPTA, placing an additional annual order of 105 tons.
While physical and chemical indicators of domestically-produced high-end distilled TMPTA match imported alternatives, inherent differences exist in molecular activity, trace impurity composition, and polarity. Raw material manufacturers only control factory output indicators without ink application expertise, while overseas factories’ formulas are permanently calibrated for imported raw materials. Direct one-to-one replacement easily triggers mass production failures. Supported by dual chemical technical expertise, HiSiaddi resolves production hazards via minor formula adjustments and process optimization without requiring customers to replace primary raw materials or production equipment. This constitutes the core supporting value enabling domestic monomers to penetrate European high-end supply chains.
Contact HiSiaddi customer service for more formulation optimization consulting services.
+86-13120989737 
info@hisiaddi.com 
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