Schnelle Antwort: Käufer arbeiten an 2K polyurethane primers usually get a cleaner first shortlist when they separate three different jobs instead of treating every silicone additive as the same primer aid. CHLUMIAG® 3467 should move first when the primer still needs a compatibility-first route für anti-cratering, substrate wetting, and leveling. CHLUMIFE® 3370 deserves earlier review when the project is a true reactive 2K PU route and the team wants stronger leveling, gloss-hold surface refinement, and smoothness inside a polyurethane crosslinking system. CHLUMIFE® 3166 belongs earlier when the primer still needs a breiteres Gleichgewicht von surface smoothness, substrate wettability, dry feel, anti-blocking, and gloss support, but the team can keep its pinhole, whitening, and foam watchpoints visible.
That is the commercially useful split. This page is nicht another broad coating-additives overview, and it is not a duplicate of the already-live 2K polyurethane topcoat oder waterborne primer pages. It is a new CHLUMICRYL® application page for buyers whose project lives specifically in the 2K PU primer window and who need a faster first screen before moving into the finish layer.
Why 2K polyurethane primers deserve their own additive page
A 2K polyurethane primer does a different job from a topcoat, and it also lives in a different system lane from a waterborne primer. In real B2B formulation work, primer teams usually are trying to stabilize surface entry, crater tolerance, Nivellierung, and a sufficiently clean surface for the next coating step, rather than chasing the same final-feel priorities that dominate a finish coat.
That makes a stage-specific primer page worth publishing. Longchang already has broader live pages for CHLUMICRYL® Beschichtungs- und Druckfarbenadditive, Nivellierungsadditive, defektgetriebene additive Auswahl, waterborne primersund 2K-Polyurethan-Decklacke. Those pages explain the branch. This page answers the narrower question that often appears one step earlier in the line: which additive deserves the first sample round when a 2K PU primer still needs cleaner compatibility, better leveling inside a reactive PU route, or broader surface balance before topcoat?
What the current company-supported evidence actually separates
- CHLUMIAG® 3467 is supported by Longchang as a Mehrkomponenten-modifiziertes Polysiloxan that Priorisiert die Systemkompatibilität. The company page directly supports Antikrater, Substratbenetzungund Nivellierung, with addition logic that fits either polyurethane modification or direct coating modification. Supported dosage is 0,05% bis 1% of total formulation for solvent systems, 0,5% bis 5% of resin amount for resin modification, and 0,5% bis 5% of total formulation for water-based systems.
- CHLUMIFE® 3370 is supported by Longchang as a reaktives Hydroxyl-Polyester-modifiziertes Polysiloxan that reacts with isocyanate und ist geeignet für Zweikomponenten-Polyurethan-Vernetzungssysteme. The company page frames it around Oberflächennivellierung, höherer Glanzund bessere Glätte, with a supported dosage of 0.05% to 3% of total formulation. It can be added at any stage of production or later, and the current company page supports it in UV- und Lösungsmittelsysteme, not water-based systems.
- CHLUMIFE® 3166 wird unterstützt als Polyether-modifiziertes Polyorganosiloxan für UV-, lösungsmittel- und wasserbasierte Systeme. Longchang supports reduced surface tension, Substratbenetzbarkeit, Oberflächenglätte, Kratzfestigkeit, Antiblockierung, Nivellierung, Glanzverbesserung, and especially ausgezeichnetes TrockengefühlDie empfohlene Dosierung beträgt 0,05% bis 1%, with explicit cautions around Nadellöcher, Aufhellung, and possible Schaumstabilisierung.
That is enough company-supported separation to build a real buyer page. External framing is used only conservatively for the general industry point that a 2K PU primer additive decision usually splits into compatibility-first defect cleanup, reactive primer leveling inside the PU routeund broader surface-balance work before the finish layer.
Kurzvergleichstabelle: Welche Route verdient den ersten Bildschirm?
| Buyer priority in 2K PU primers | Beste erste Route | Warum es an erster Stelle steht | Hauptbeobachtungspunkt |
|---|---|---|---|
| Compatibility-first anti-cratering, substrate-wetting, and leveling control in a more formulation-sensitive primer package | CHLUMIAG® 3467 | Longchang explicitly prioritizes system compatibility and supports anti-cratering, wetting, and leveling, plus polyurethane-modification use | Its supported caution is that the feel is slightly less refined when compared with more feel-led routes |
| Reactive 2K PU leveling and smoother primer-surface preparation before the finish layer | CHLUMIFE® 3370 | Longchang positions it for two-component polyurethane crosslinking systems and ties it to leveling, gloss, and smoothness | Keep the system boundary visible because the current company page supports UV and solvent routes, not water-based systems |
| Broader surface balance across wettability, smoothness, dry feel, anti-blocking, leveling, and gloss support | CHLUMIFE® 3166 | Longchang unterstützt dies in UV-, lösungsmittel- und wasserbasierten Systemen mit einem breiteren Spektrum an Oberflächeneigenschaften. | Das Risiko von Nadellöchern, Weißfärbung und Schaumstabilisierung sollte frühzeitig überprüft werden. |
Wann ist CHLUMIAG® 3467 der bessere erste Schritt?
3467 should move first when the 2K PU primer still looks compatibility-sensitive and the main question is whether the team can stabilize anti-cratering, substrate wetting, and leveling without narrowing the formulation window too fast. Longchang’s current product page is unusually helpful here because it does not position 3467 only as a generic leveling aid. It explicitly says the product Priorisiert die Systemkompatibilität, and it also supports use for polyurethane modification.
That matters in 2K primer work. Some primer programs are not failing because the lab chose the wrong surface family in the abstract. They are failing because the system is still sensitive and the first screen needs a route that keeps formulation tolerance visible while still addressing crater and wetting pressure.
- Unterstützte Stärken: anti-cratering, substrate wetting, leveling, and compatibility-first behavior
- Additionslogik: can be added with the polyol during resin prepolymerization, added later in polyurethane modification, or added directly to the coating system
- Systempassform: UV-, lösungsmittel- und wasserbasierte Systeme
- Wichtigste Vorsichtsmaßnahme: Longchang notes that the feel is slightly less refined, so it should not be the automatic first choice if the project already has moved into a more feel-led or premium-finish target
In short, 3467 is the cleaner first screen when the primer team needs compatibility-first control before worrying about a more reactive or broader feel-balance route.
Wann ist CHLUMIFE® 3370 der bessere erste Schritt?
3370 should move earlier when the buyer is working on a true reactive 2K polyurethane route and wants the additive choice to stay inside that system logic. Longchang supports 3370 as a reaktives Hydroxyl-Polyester-modifiziertes Polysiloxan that reacts with isocyanate so the organosilicon can combine with the resin system in block or graft form. The company page also says it is geeignet für Zweikomponenten-Polyurethan-Vernetzungssysteme.
That makes 3370 commercially useful when the primer already is clearly a 2K PU system and the first question is not only broad wetting correction. It is whether the lab can achieve better leveling, smoother primer laydown, and a cleaner surface before the next coating stage without stepping outside the reactive polyurethane route.
- Unterstützte Stärken: leveling, higher gloss, and better smoothness
- Empfohlene Dosierung: 0,05% bis 3% der Gesamtformulierung
- Additionslogik: kann in jeder Phase der Produktion oder später hinzugefügt werden
- Systempassform: supported in UV and solvent systems, not water-based systems on the current company page
So 3370 is the better first benchmark when the buyer needs a reactive 2K PU primer route rather than a more compatibility-led or broader multi-system route.
Wann CHLUMIFE® 3166 der bessere erste Schritt ist
3166 deserves earlier review when the primer still needs a breitere Oberflächenbilanzroute before the topcoat stage. Longchang’s company page positions 3166 around Oberflächenspannungssteuerung, ausgezeichnetes Trockengefühl, Substratbenetzbarkeit, Oberflächenglätte, Antiblockierung, Nivellierungund Glanzverbesserung. That is a different first-screen role from 3467’s compatibility-first logic or 3370’s reactive-PU route.
This makes 3166 useful when the primer problem is still broader than one narrow crater or reactive-chemistry decision. Some teams need a first route that helps them judge whether the primer surface can become cleaner, smoother, and easier to handle before they narrow into a more specialized option.
- Unterstützte Stärken: substrate wettability, surface smoothness, anti-blocking, leveling, gloss support, and excellent dry feel
- Empfohlene Dosierung: 0,05% bis 1% der Gesamtformulierung
- Additionslogik: can be added at any stage, and can be diluted first for easier addition
- Wichtigste Vorsichtsmaßnahme: Longchang explicitly warns about pinholes, whitening, and possible foam stabilization, so a defoamer check should stay visible during qualification
That makes 3166 the better first route when the lab still needs a broader primer-surface read before it narrows into a tighter compatibility or reactive-system decision.
Wie Käufer vor der ersten Musterrunde auswählen sollten
1. Beginnen Sie mit der eigentlichen Phase des Scheiterns.
If the primer still looks compatibility-sensitive and crater-prone, start with 3467. If the line already is clearly a 2K PU reactive route and needs a cleaner primer surface before the finish layer, move 3370 earlier. If the primer still needs a broader balance across wettability, smoothness, and handling, start with 3166.
2. Die Systemgrenze sichtbar halten
3467 and 3166 both sit across wider system windows. 3370 does not. That alone can save time when the team is screening more than one primer route in parallel.
3. Keep compatibility logic separate from reactive-route logic
Both 3467 and 3370 can touch leveling, but the supported selection logic is not the same. One is a compatibility-first route. The other is a reactive polyurethane route tied directly to isocyanate-crosslinking systems.
4. Use the watchpoint, not only the headline benefit
3467 keeps formulation tolerance visible but is not the most feel-led option. 3370 is best treated as a true 2K PU route, not a general water-based shortcut. 3166 can be broad and useful, but its pinhole, whitening, and foam watchpoints should be screened early.
5. Die erste Runde eng gestalten
For many 2K PU primer projects, one compatibility-first route, eins reactive PU routeund eins breitere Oberflächenbilanzroute teach more than an overloaded first panel packed with near-neighbor additives.
Empfohlene Route nach Longchang von dieser Seite
- Clusterübersicht: CHLUMICRYL® Beschichtungs- und Druckfarbenadditive
- Related stage-specific page: How to Choose Additives for Waterborne Primers
- Related finish-layer page: Wie man Oberflächenadditive für 2K-Polyurethan-Decklacke auswählt
- Zugehörige Funktionsseite: Wie man Verlaufsmittel für Lacke und Druckfarben auswählt
- Related diagnosis page: Netzmittel vs. Verlaufsmittel vs. Entschäumer vs. Fluortensid in Lacken und Druckfarben
- 3467 product page: CHLUMIAG® 3467
- Produktseite 3370: CHLUMIFE® 3370
- Produktseite 3166: CHLUMIFE® 3166
FAQ
Which additive should I screen first if my 2K PU primer still shows crater risk and formulation sensitivity?
Usually CHLUMIAG® 3467, because Longchang directly supports it around compatibility-first use, anti-cratering, substrate wetting, leveling, and polyurethane-modification routes.
When should 3370 move ahead of 3467?
3370 should move ahead when the project is clearly a reactive two-component polyurethane route and the main target is cleaner leveling and surface refinement inside that PU crosslinking system.
When does 3166 make more sense than the other two?
It makes more sense when the primer still needs a broader surface-balance screen across wettability, smoothness, anti-blocking, and handling, rather than only a compatibility-first or reactive-system decision.
Is this page the same as the 2K PU topcoat page?
No. The topcoat page is built around finish-layer selection logic. This new page is for the primer stage and helps buyers screen compatibility-first crater control, reactive primer leveling, and broader pre-topcoat surface balance.
Need a faster shortlist for 2K polyurethane primers?
If your primer project is stuck between compatibility-first defect cleanup, reactive PU levelingund broader surface balance before topcoat, define the real first-screen job before requesting samples. That usually shows much faster whether 3467, 3370, or 3166 deserves the first round.