{"id":10516,"date":"2026-07-09T00:00:39","date_gmt":"2026-07-09T00:00:39","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10516"},"modified":"2026-08-09T10:48:28","modified_gmt":"2026-08-09T10:48:28","slug":"release-coating-additive-selection","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/fr\/release-coating-additive-selection\/","title":{"rendered":"UV Release Additives: 2750, 3501 & 3565 Limits"},"content":{"rendered":"

UV release coating additives should be selected by chemistry, release test and downstream print\/recoat requirements.<\/strong> The CHLUMIAG\u00ae 2750 family is the only first route here with a public reactive-acrylic and UV reverse-varnish claim, plus 0.1\u20133% guidance. CHLUMIAG\u00ae 3501 is a conditional nonreactive comparison because no public dose is available.<\/p>\n

CHLUMIAG\u00ae 3565 is removed from the first shortlist. Its detailed release claim concerns dry-process PU leather and release-paper reuse, not UV ink or overprint-varnish release; its page also publishes conflicting dosage statements and a pinhole warning.<\/p>\n

UV release-coating decision map<\/h2>\n
\n\n\n\n\n\n\n\n\n
Application evidence<\/th>\nFirst route<\/th>\nApproval gate<\/th>\n<\/tr>\n<\/thead>\n
Solvent-free or solvent-containing UV reverse varnish needs controlled release<\/td>\n2750<\/td>\nCure, release force, rub and overprint\/recoat<\/td>\n<\/tr>\n
Broad release or anti-sticking screen is desired but dose is missing<\/td>\n3501 after current TDS<\/td>\nEstablish dose and quantified endpoint before trial<\/td>\n<\/tr>\n
Project is PU-leather slurry on reusable release paper<\/td>\n3565 may belong to a different project<\/td>\nDo not transfer the result to UV varnish<\/td>\n<\/tr>\n
High release appears only when UV cure is incomplete<\/td>\nCorrect cure first<\/td>\nNo additive approval<\/td>\n<\/tr>\n<\/tbody>\n<\/table>
Original UV-release map: separate reverse varnish, pressure-sensitive release and PU-leather release-paper work before product selection.<\/figcaption><\/figure>\n\n\n\n\n\n\n\n
Produit<\/th>\nPublished facts<\/th>\nSupported route<\/th>\nBoundary<\/th>\n<\/tr>\n<\/thead>\n
2750 family<\/strong><\/a><\/td>\nReactive acrylic groups; 100% active; 0.1\u20133%; UV\/solvent, not water<\/td>\n2750 is listed for reverse varnish; 2780 for anti-blocking\/anti-graffiti<\/td>\nFamily page does not replace variant-specific cure and performance data<\/td>\n<\/tr>\n
3501<\/strong><\/a><\/td>\n100% active modified polysiloxane; water\/UV\/solvent; any-stage addition<\/td>\nBroad printing, overprint-varnish and release-coating category<\/td>\nNo public recommended dosage or quantified release result<\/td>\n<\/tr>\n
3565<\/td>\n100% active; water\/UV\/solvent; pinhole warning<\/td>\nPU-leather anti-sticking\/peeling and release-paper reuse<\/td>\nTwo public dosage statements; not a documented UV reverse-varnish route<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Define what \u201crelease\u201d means<\/h2>\n

Release may mean pressure-sensitive tape or label release, reduced blocking between printed faces, easy separation from a process liner, or a reverse-varnish effect. These are different contact pairs and force histories. Name the adhesive, liner\/film, coated side, pressure, dwell, temperature, peel angle and speed.<\/p>\n

Also define what must remain printable, laminateable or recoatable. Very low surface energy can improve release while damaging the next operation.<\/p>\n

Use 2750 for the documented UV reverse-varnish route<\/h2>\n

The family page states that reactive acrylic functional groups crosslink into the polymer network and lists solvent-free UV, solvent-containing UV and acrylic systems. It specifically says 2750 is more suitable for reverse varnishes. Start with a blank and compact ladder within 0.1\u20133%.<\/p>\n

Confirm the photoinitiator, lamp spectrum\/intensity, line speed, oxygen exposure and film weight. Test cure at the low and high ends of the production window; an under-cured surface can appear unusually releasable, tacky or weak.<\/p>\n

Use 3501 only after dosage confirmation<\/h2>\n

3501 lists overprint varnishes and release coatings for anti-sticking, but the page provides no recommended level. It also gives no reactive-functional, release-force, rub or block data. Request the current TDS and a product-specific technical rationale before adding it.<\/p>\n

Keep 3565 in its documented application<\/h2>\n

3565\u2019s main release evidence is for PU leather slurry and repeated use of textured release paper. The page lists both 0.05\u20131% and 0.02\u20133%, instructs addition before curing agent and warns of pinholes. Those facts do not justify a first UV-OPV recommendation.<\/p>\n

Measure cure, release and rub separately<\/h2>\n

ASTM D3330\/D3330M<\/a> includes pressure-sensitive tape peel methods and a release-liner method, but it does not automatically fit every reverse-varnish application. Agree on tape, substrate, conditioning, peel rate and acceptance criteria.<\/p>\n

ASTM D5264<\/a> provides a laboratory rub comparison for printed materials. Pair release force with cure, surface energy\/contact angle, gloss\/haze, blocking, adhesion, rub, scratch and downstream overprint, lamination or recoat.<\/p>\n

Build a production-relevant trial<\/h2>\n
    \n
  1. Hold resin, monomers, photoinitiator, pigments and film weight.<\/li>\n
  2. Prepare a blank and one product ladder at equal active addition reporting.<\/li>\n
  3. Cure across the production energy and line-speed window.<\/li>\n
  4. Condition specimens before release and rub measurement.<\/li>\n
  5. Repeat after warm storage and after the longest downstream-conversion delay.<\/li>\n<\/ol>\n

    Common release-coating errors<\/h2>\n

    Using slip as a release-force substitute<\/h3>\n

    Low friction between films is not the same measurement as peeling an adhesive or separating a coated contact pair. Define the actual interface.<\/p>\n

    Ranking under-cured UV films<\/h3>\n

    Residual monomer and incomplete network formation can change tack, rub and peel. Confirm the cure window before comparing additive levels.<\/p>\n

    Transferring a family claim to every variant<\/h3>\n

    The shared 2750\/2760\/2780\/2505 page gives different application emphasis and viscosities. Request variant-specific data rather than assuming interchangeability.<\/p>\n

    Using one peel result<\/h3>\n

    Release force can vary with peel rate, dwell, temperature, adhesive lot and aging. Build a matrix that represents storage and end use.<\/p>\n

    Retain the tested contact materials and record which surface fails. Adhesive transfer, cohesive failure, coating pick-off and clean release can produce similar force numbers but imply very different formulation decisions. Photograph the interface and preserve specimens for comparison after aging.<\/p>\n

    Request a release-test match<\/h2>\n

    Send UV resin\/monomer\/photoinitiator, substrate or liner, adhesive\/contact material, application and cure conditions, target release method\/force, film weight, current additives, rub\/block and overprint\/lamination\/recoat requirements. Ask Longchang Chemical for a 2750-led UV release trial and current 3501 data<\/strong><\/a>.<\/p>","protected":false},"excerpt":{"rendered":"

    A B2B buyer guide for choosing release-coating and anti-sticking additives in UV inks and overprint varnishes, with a practical shortlist around CHLUMIAG\u00ae 2750, CHLUMIAG\u00ae 3501, and CHLUMIAG\u00ae 3565.<\/p>","protected":false},"author":6,"featured_media":10517,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-10516","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"\nUV Release Additives: 2750, 3501 & 3565 Limits<\/title>\n<meta name=\"description\" content=\"Choose UV release additives by reactive chemistry, dosage evidence, cure, release force, rub and downstream overprint, lamination or recoat requirements.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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