{"id":10553,"date":"2026-07-11T00:00:24","date_gmt":"2026-07-11T00:00:24","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10553"},"modified":"2026-08-08T05:40:11","modified_gmt":"2026-08-08T05:40:11","slug":"pu-leather-additive-selection","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/it\/pu-leather-additive-selection\/","title":{"rendered":"PU Leather Additives: Feel, Compatibility & Surface Control"},"content":{"rendered":"

Choose PU leather additives by the layer and the first commercial requirement: tactile feel, compatibility-focused polyurethane modification, or general surface control.<\/strong> CHLUMIFE\u00ae 3370 is the waxy feel route for solvent\/UV systems, CHLUMIAG\u00ae 3467 is the compatibility-prioritized route with published PU-modification guidance, and CHLUMIAG\u00ae 3565 is a broad surface-control route with a pinhole warning.<\/p>\n

The current public facts do not document 3565 as a PU slurry release or release-agent product. Treat it as a surface-control candidate, not a promised demolding solution. For any release complaint, first identify the exact wet-process, dry-process, transfer, embossing, paper-release, or topcoat stage and obtain application-specific supplier evidence.<\/p>\n

PU leather additive decision map<\/h2>\n
\n\n\n\n\n\n\n\n
Layer and first requirement<\/th>\nFirst route<\/th>\nCritical guardrail<\/th>\n<\/tr>\n<\/thead>\n
Solvent\/UV topcoat needs a waxy or silky tactile profile<\/td>\nCHLUMIFE\u00ae 3370<\/td>\nDispersion, haze, gloss, abrasion, blocking, print and adhesion<\/td>\n<\/tr>\n
PU formulation needs compatibility-focused surface or resin modification<\/td>\nCHLUMIAG\u00ae 3467<\/td>\nSeparate coating post-addition from resin prepolymerization; protect reactive balance<\/td>\n<\/tr>\n
Water\/solvent\/UV coating needs broad surface control before curing agent addition<\/td>\nCHLUMIAG\u00ae 3565<\/td>\nResolve current dosage guidance; watch pinholes, foam, adhesion, and cure<\/td>\n<\/tr>\n<\/tbody>\n<\/table>
Original layer-first map: identify where the defect occurs before selecting a tactile, PU-modification, or surface-control route.<\/figcaption><\/figure>\n\n\n\n\n\n\n\n
Prodotto<\/th>\nPublished facts<\/th>\nSupplier starting guidance<\/th>\nImportant boundary<\/th>\n<\/tr>\n<\/thead>\n
CHLUMIFE\u00ae 3370<\/strong><\/a><\/td>\nModified polysiloxane; waxy solid; initial melting point \u226550\u00b0C<\/td>\n0.05\u20133%; UV and solvent systems<\/td>\nNot published as water-based or as a reactive PU additive<\/td>\n<\/tr>\n
CHLUMIAG\u00ae 3467<\/strong><\/a><\/td>\nModified polysiloxane; 100% active; hydroxyl value \u226485 mg KOH\/g<\/td>\n0.05\u20131% in solvent coatings; separate water\/resin-modification ranges<\/td>\nCompatibility is prioritized; supplier says feel is less refined<\/td>\n<\/tr>\n
CHLUMIAG\u00ae 3565<\/strong><\/a><\/td>\nPolyether-modified polysiloxane; 100% active; UV, solvent, and water-based<\/td>\nPublic page contains both 0.05\u20131% and 0.02\u20133% statements; confirm current TDS<\/td>\nAdd before curing agent; pinhole risk; no public PU-release claim<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Define the PU leather layer before choosing<\/h2>\n

A PU leather construction may include base fabric, porous or compact PU layers, color layers, skin\/topcoat, printed effects, embossing, and adhesive or laminate interfaces. A product useful in a solventborne topcoat cannot be assumed suitable for a waterborne skin, wet-process coagulation bath, adhesive, or PU prepolymer.<\/p>\n

Record the exact layer, resin, carrier, solids, pigment, crosslinker, catalyst, process temperature, film weight, flash\/cure, and downstream operation. Define whether the failure is feel, wetting, leveling, pinholes, blocking, abrasion, flex cracking, print adhesion, release, or another property.<\/p>\n

Use 3370 when waxy feel is the target<\/h2>\n

3370 is a waxy solid for solvent and UV systems, not a water-based route. It is appropriate to screen when the commercial target is a waxy\/silky tactile profile in a suitable PU topcoat. Document incorporation temperature, mixing energy, addition order, and cooling history because the published initial melting point is at least 50\u00b0C.<\/p>\n

Do not approve from hand feel alone. Measure gloss, haze, color, abrasion, mar, blocking, flex, print and adhesive bond, recoating, cleanability, and warm aging. The product page does not support describing 3370 as reactive with PU or isocyanate.<\/p>\n

Use 3467 when compatibility is the first risk<\/h2>\n

3467 prioritizes system compatibility and is listed for water, solvent, and UV systems. The supplier publishes coating-stage use and a separate polyurethane resin-modification route, including addition with the polyol during prepolymerization or later.<\/p>\n

Do not collapse those routes into one instruction. Resin modification may affect reactive calculations and polymer structure, while a finished-coating addition is a different experiment. Confirm the intended route and current technical guidance; account for the published hydroxyl value where reactive balance is relevant.<\/p>\n

Use 3565 only as a qualified surface-control route<\/h2>\n

3565 is a polyether-modified polysiloxane listed for water, solvent, and UV systems. The page says it is dispersible in water, oil-soluble, and should be added before the curing agent with thorough stirring. It also warns that similar use may cause pinholes.<\/p>\n

The same public page contains two dosage statements\u20140.05\u20131% and 0.02\u20133% of total formulation. Obtain the current technical data sheet and resolve the correct range for the actual system before sampling. Do not present 3565 as a slurry-release route unless the supplier provides application-specific evidence.<\/p>\n

Build a layer-specific trial<\/h2>\n
    \n
  1. Prepare one process-stable control.<\/strong> Hold substrate, PU resin, crosslinker, pigment, solids, viscosity, application weight, flash, and cure constant.<\/li>\n
  2. Choose one layer and one target.<\/strong> Do not compare topcoat feel and base-layer release in the same test.<\/li>\n
  3. Run one additive route at a time.<\/strong> Use a blank plus a compact ladder inside confirmed supplier guidance.<\/li>\n
  4. Condition the laminate.<\/strong> Test after full cure and after the temperature\/humidity history relevant to shipment and use.<\/li>\n
  5. Challenge downstream steps.<\/strong> Include embossing, printing, lamination, sewing, gluing, recoating, or cleaning that apply.<\/li>\n<\/ol>\n

    Measure tactile, mechanical, and bonding performance<\/h2>\n

    Record tactile ranking with blinded assessors, static\/kinetic friction where relevant, gloss, haze, color, leveling, pinholes, foam, block resistance, abrasion, mar, flex, elongation, adhesion between layers, print and adhesive bond, solvent\/chemical resistance, hydrolysis\/heat-aging results, and odor.<\/p>\n

    ASTM D1894<\/a> covers static and kinetic friction of plastic film and sheeting. ASTM D5178<\/a> covers mar resistance on smooth, flat coating surfaces, while ASTM D5402<\/a> covers solvent-rub assessment for chemically curing organic coatings and cautions that solvent resistance alone does not prove full cure. Use these only when the specimen and requirement fit; flexible multilayer PU leather often needs customer-specific tests as well.<\/p>\n

    Avoid common PU leather selection errors<\/h2>\n

    Calling every low-friction result \u201cbetter feel\u201d<\/h3>\n

    Define the tactile target with reference samples and blinded ranking. Friction data can support the decision but does not capture softness, waxiness, dryness, or warmth by itself.<\/p>\n

    Using a topcoat additive to solve a release-stage problem<\/h3>\n

    Identify the sticking interface, temperature, pressure, dwell, release paper or mold, resin layer, cure state, and contamination. Request a documented release solution rather than assuming a surface additive has that function.<\/p>\n

    Ignoring pinholes after surface improvement<\/h3>\n

    For 3565, pinholes are an explicit supplier warning. Repeat foam, pinhole, cure, and adhesion checks at production film thickness and mixing energy.<\/p>\n

    Related polyurethane and feel guides<\/h2>\n

    Use the 2K PU clearcoat guide<\/a> for a clearcoat-specific cure and recoatability comparison, the soft-touch guide<\/a> when tactile coating performance is the primary intent, or the furniture coating guide<\/a> for rigid wood\/board finishing.<\/p>\n

    Request a PU leather additive comparison<\/h2>\n

    Send the PU chemistry and exact layer, water\/solvent\/UV system, crosslinker and catalyst, solids and viscosity, substrate, application\/transfer method, film weight, flash\/cure, required tactile reference, defect photos, current additives, downstream processes, and aging tests. Ask Longchang Chemical to qualify 3370, 3467, or 3565 for the correct layer<\/strong><\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

    Una pratica guida di selezione B2B per i team di rivestimento in pelle PU e poliuretano, che confronta CHLUMIFE\u00ae 3370, CHLUMIAG\u00ae 3467 e CHLUMIAG\u00ae 3565 per livellamento PU 2K, sensazione tattile piacevole, propriet\u00e0 antiaderenti, distacco, resistenza ai graffi, flessibilit\u00e0 a basse temperature e compatibilit\u00e0 con rivestimenti compositi.<\/p>","protected":false},"author":6,"featured_media":10554,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10553","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nPU Leather Additives: Feel, Compatibility & Surface Control<\/title>\n<meta name=\"description\" content=\"Compare PU leather additives 3370, 3467 and 3565 for tactile feel, compatibility or surface control, with cure, adhesion and pinhole guardrails.\" \/>\n<meta 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