HiSiaddi is an innovative foreign trade service provider driven by dual engines of technology transformation and foreign trade services. It has established a "1+2+3+4=1" service system and can supply UV 360 sourced directly from multiple well-known original brand manufacturers.
As a foreign trade service provider with independent R&D capabilities, HiSiaddi has repeatedly proposed UV 360 formula optimization schemes and application improvement suggestions through technological transformation cooperation with manufacturers and precise market insight. Below is a consultation case of UV 360 formula optimization delivered by HiSiaddi.
Please contact HiSiaddi customer service if you require formula optimization consultation services.
Purchaser: HOLLAND OPTIPLAST B.V. Located in the New Material Industrial Park on the outskirts of Amsterdam, the Netherlands, the company has 29 years of experience in producing high-end high-transmittance polycarbonate daylighting panels, transparent protective panels for food processing equipment and weather-resistant PC sheets. Its products are long supplied to leading EU greenhouse engineering groups, Western European food processing equipment manufacturers and building curtain wall supporting enterprises. Its finished products must comply with EU LFGB food contact regulation, REACH and automotive plastic weathering testing specifications, and pass full tests including 3500h xenon lamp accelerated aging, 285℃ high-temperature extrusion stability and 95℃ water boiling food migration. For many years, the company exclusively adopted original Swiss Clariant UV360 as UV absorber, with a stable annual consumption of 43 tons. All mass production formulas, mixing processes and extrusion temperature controls were calibrated around the physical and chemical properties of imported raw materials.
Against the backdrop of continuous price hikes of European chemical raw materials and capacity maintenance at Clariant’s European plants extending delivery lead time of original UV360 to 112 days with sharp procurement cost increases, the client launched a localization raw material substitution project. After preliminary physical and chemical data screening, the client selected mid-to-high-end refined domestic UV360 and purchased 16 tons for warehouse stocking. The client directly adopted the original addition ratio, mixing specifications and twin-screw extrusion temperature parameters tailored for imported raw materials and launched mass production on four PC panel extrusion lines. Within less than one week of production, four production lines suffered four severe product defects, pushing the non-conforming rate of finished products up to 33% and forcing intermittent line shutdowns. The domestic supplier could only provide national standard physical and chemical COA test reports merely guaranteeing purity to meet national standard limits. Lacking an R&D team specializing in optical plastic formula applications, the supplier failed to grasp the dispersion mechanism and high-temperature processing compatibility of UV360 in high-transmittance PC systems, and random adjustments of additive dosage via online communication produced no effective rectification results. Upon recommendation by the Dutch Plastics Industry Association, the client fully entrusted HiSiaddi’s technical expert team to deliver a full set of technical rectification services covering raw material physical and chemical comparison, fault tracing, formula optimization and on-site production process implementation.
1. Dense microcrystalline spots and haze on transparent PC panels leading to sharp decline in light transmittance: Pinpoint white dots and flaky haze spread across the surface of high-gloss PC daylighting panels, dropping light transmittance from 92.1% (with Clariant raw materials) to 82.3%, failing appearance acceptance standards for European building daylighting panels and resulting in mass scrapping of finished panels. Preliminary client inspection confirmed the white dots were agglomerated UV360 powder particles with incomplete melting and dispersion.
2. Continuous precipitation of white blooming impurities on inner die walls under high-temperature extrusion causing frequent shutdowns for mold cleaning: Under 275–285℃ high-temperature extrusion conditions, white flocculent precipitates accumulated on inner die walls after over 8 hours of continuous production, blocking die orifices and causing uneven panel thickness. Each line required an average of 2 shutdowns per day for cleaning, plummeting production efficiency and surging edge material waste.
3. Excessive yellowing after weathering aging failing color difference standards for 3500h xenon lamp test: Per mandatory EU outdoor panel testing standards, color difference ΔE of panels after 3500h xenon lamp accelerated weathering exceeded 2.0, far above the client’s internal control threshold of ΔE ≤ 0.8. Light-colored transparent panels suffered overall yellowing after short-term outdoor exposure, making them undeliverable for high-end greenhouse engineering orders.
4. Caking of pre-mixed PC powder under normal temperature storage leading to unstable extrusion feeding and frequent melt breakage: After sealed storage for 48 hours at room temperature, mixed PC resin and additive powder agglomerated, causing fluctuating feeding speed, dramatic screw load swings during extrusion, frequent melt breakage and filter screen blockage, disabling stable continuous production.
HiSiaddi formed a team of UV absorber R&D engineers, PC modification formula specialists and extrusion process engineers. Parallel physical and chemical tests were carried out on domestic UV360, original Clariant UV360, all auxiliary formula materials of the client and defective finished product samples. Combined with workshop temperature control records and mixing time logs, root causes of each fault were analyzed one by one.
Original Clariant UV360 undergoes multi-stage low-temperature gas ultra-fine grinding before delivery with D50 particle size ≤4.5μm and loose porous powder that melts and disperses rapidly in high-temperature PC melt. While the domestic refined UV360 purchased by the client meets national standard GC purity, conventional mechanical grinding produces D50 ranging from 17μm to 26μm with coarse crystal grains. The client adopted solid room-temperature direct feeding, preventing large-particle additives from sufficient swelling and melting in PC melt within short time periods. Local additive enrichment formed solid microcrystals, which turned into crystalline spots and haze on formed panels. Meanwhile, natural short-wave ultraviolet light in the batching workshop induced slight decomposition of UV360 to form insoluble impurities, further aggravating panel haze defects.
The recrystallization solvent removal process of domestic UV360 lags behind Clariant’s sealed negative-pressure deep solvent removal technology, leaving trace low-molecular alcohol solvents and unreacted small-molecule intermediates in products. The effective main component content of domestic UV360 is slightly higher than imported counterparts, yet the client retained the original formula addition ratio of 0.38% without dosage reduction. Excessive additive dosage coupled with volatilization of residual small molecules under high temperature formed white blooming scale after cooling on low-temperature die areas.
The client’s original formula only added UV360 without matched hindered amine HALS to build a synergistic light stabilization system. Clariant strictly controls synthetic by-products with extremely low trace yellow-inducing impurity content, while domestic UV360 retains a small amount of colored by-products during synthesis. A single UV absorber cannot fully capture free radicals generated by polymer degradation under light exposure, and impurities and polymer degradation products form chromophoric groups during long-term aging leading to rapid panel yellowing and discoloration.
The client’s formula adopted slightly acidic phosphite auxiliary antioxidants, while domestic UV360 contained trace free phenol impurities. Weak molecular association occurred between acidic components and phenolic substances under room-temperature storage, causing additives to bind and agglomerate, ultimately reducing pre-mixed powder fluidity and triggering abnormal extrusion feeding.
Based on the client’s existing production line hardware conditions and Dutch food-grade compliance control standards, detailed rectification rules were implemented from four dimensions: feeding pre-treatment, fine-tuning of formula dosage, auxiliary material compatibility optimization and segmented extrusion temperature control, requiring no large-scale equipment renovation from the client.
First, renovate batching workshop: install light-shielding enclosures and replace lighting with yellow explosion-proof lamps to isolate ambient ultraviolet light and prevent premature photodegradation and deterioration of UV360 during feeding. Second, deploy carrier pre-melt masterbatch process: pre-mix UV360 with 5% PC carrier resin via low-temperature internal mixing to prepare high-concentration masterbatch of 20% content, which is fed into the main mixing system to drastically improve additive dispersion efficiency in resin systems. Third, coordinate upstream suppliers to customize ultra-fine grinding specifications for subsequent batches of UV360 with locked D50 ≤4.8μm to optimize dispersion performance at the raw material source.
Adjust UV360 addition ratio from original 0.38% to 0.29% based on measured effective component content of domestic raw materials, reducing risks of excessive additive precipitation while guaranteeing ultraviolet shielding efficiency. Simultaneously require suppliers to optimize negative-pressure deep solvent removal procedures for follow-up products to strictly control low-boiling solvent residues and lower high-temperature volatilization risks at the raw material end.
Add 0.17% high-molecular hindered amine HALS944 to the original formula: UV360 absorbs ultraviolet light energy while hindered amines capture free radicals generated by polymer degradation, forming a classic synergistic light stabilization system. Match with 0.11% composite primary and auxiliary antioxidants to inhibit polymer oxidative discoloration during processing and outdoor service, comprehensively improving long-term weathering yellowing defects.
Replace overly acidic phosphite auxiliary antioxidants in the formula with neutral modified phosphite products to eliminate acidic system environments. Add 0.08% polyethylene wax powder dispersant to the formula to block molecular association and agglomeration between UV360 and antioxidant additives. After optimization, pre-mixed powder shows no caking after 15 days of sealed storage at room temperature with stable fluidity, fully meeting raw material warehousing turnover demands.
Abolish the original unified full-line high-temperature processing mode of 280℃ and adjust four-stage extrusion temperature: feeding section 258℃, plasticizing section 266℃, homogenization section 272℃, die head 278℃. Moderately lower processing temperature to reduce thermal decomposition and volatilization of UV360 and alleviate die scale precipitation.
HiSiaddi prepared gradient samples per the optimized scheme, and the client’s laboratory completed four core tests including light transmittance, 3500h xenon lamp aging, high-temperature precipitation and powder storage stability. Post-optimization panel light transmittance recovered above 91.8%, weathering yellowing index ΔE stabilized within 0.75, with no blooming or powder caking; all indicators fully matched original Clariant products.
Dedicate a greenhouse panel production line to implement the full optimized process with 72-hour non-stop continuous extrusion. No mold blockage or melt breakage occurred across the whole line, finished panels featured clean surfaces free of crystalline spots and haze, and all physical and chemical and food migration tests passed one-time audit by Dutch food authorities.
After confirmation of qualified pilot data, all stocked domestic UV360 was put into production in batches following optimized formulas and operation specifications. All four suspended production lines resumed full-capacity manufacturing, and the monthly finished product qualification rate rebounded to 99.4%, enabling on-time delivery of European greenhouse engineering orders and recovering economic losses caused by previous production shutdowns and scrapping.
1. Procurement cost optimization: Combined additive dosage reduction and price gap of domestic raw materials cut comprehensive additive procurement cost of client’s PC panels by 28.6%. An annual procurement framework for 43 tons of UV360 was formally signed with monthly batch production and delivery, shortening raw material arrival lead time from 112 days to 34 days.
2. Long-term full-series formula technical trusteeship: The client entrusts HiSiaddi with permanent technical management covering light stabilizer selection and formula debugging for all its daylighting panel and food protective sheet product lines. Pre-compatibility sample testing is conducted for all incoming raw material batches to avoid mass production faults before warehousing.
3. Supporting service for new product R&D: The client commissioned HiSiaddi to optimize UV360 compound formulas and extrusion processing technologies for its upcoming ultra-thin optical PC film R&D.
4. Upstream product iterative upgrading: Supported by measured data from high-end Dutch end users, suppliers finalized an exclusive grade of optical PC dedicated ultra-fine low-precipitation food-grade UV360, and secured orders from two additional high-end PC panel manufacturers in Belgium and Luxembourg via HiSiaddi.
1. While physical and chemical indicators of conventional domestic UV360 can meet national standards, gaps remain versus imported Clariant products in particle size control, small-molecule residue and trace by-product management. Formulas of mid-to-high-end European and American optical PC products are calibrated around physical properties of imported additives year-round; direct equal-quantity substitution with domestic raw materials easily triggers compatibility conflicts and mass production defects. Most additive manufacturers only focus on product synthesis and production, lacking application technical reserves for downstream optical plastic formula and extrusion processes, making them unable to deliver systematic on-site process rectification for end users.
2. Core value of HiSiaddi: Establish a full-link technical closed loop covering raw material physical property testing, fault mechanism analysis, refined formula improvement, workshop production process implementation and iterative upgrading of upstream raw material grades, bridging the application technology gap between additive manufacturers and overseas high-end end users.
3. High-end plastic clients in Western Europe such as the Netherlands impose rigid mandatory demands for supporting formula optimization and mass production on-site technical guidance in addition to raw material quality specifications. Integrated technology empowerment constitutes the core competitive advantage distinguishing foreign trade service providers from factory salesmen and ordinary spot traders.
Please contact HiSiaddi customer service if you require formula optimization consultation services.
+86-13120989737 
info@hisiaddi.com 
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