{"id":10440,"date":"2026-07-05T00:00:40","date_gmt":"2026-07-05T00:00:40","guid":{"rendered":"https:\/\/longchangchemical.com\/?p=10440"},"modified":"2026-08-09T15:45:07","modified_gmt":"2026-08-09T15:45:07","slug":"anti-blocking-additives-coatings-inks","status":"publish","type":"post","link":"https:\/\/longchangchemical.com\/zh\/anti-blocking-additives-coatings-inks\/","title":{"rendered":"Anti-Blocking Additives for Coatings & Inks: Selection Guide"},"content":{"rendered":"

Anti-blocking additives for coatings and inks are selected to reduce unwanted adhesion when two coated or printed surfaces remain in contact under pressure, heat, or storage time.<\/strong> Start by confirming that the failure is true blocking\u2014not incomplete cure, retained solvent or water, excessive film tack, or simply high sliding friction. Then screen the additive in the actual binder, cure schedule, film weight, contact pressure, temperature, and dwell time used in production.<\/p>\n

This guide compares four Longchang routes for water-based, solvent-based, and UV-curable systems. The product recommendations are screening starting points, not a substitute for compatibility, regulatory, or production validation.<\/p>\n

Blocking, slip, and cure are different problems<\/h2>\n

Blocking is surface-to-surface adhesion after contact. Slip describes the force required for one surface to move across another. A film can slide easily yet still block after a warm stack test; it can also show a low blocking tendency but still have excessive friction on a converting line.<\/p>\n

Before changing the formulation, check whether the film has reached its intended conversion. For a waterborne coating, record residual water and drying conditions. For a solventborne system, confirm solvent release. For a UV system, confirm that lamp output, line speed, film thickness, pigment loading, and oxygen inhibition are not leaving an under-cured surface. An additive cannot reliably compensate for an incomplete film.<\/p>\n

\n\n\n\n\n\n\n\n\n
Observed failure<\/th>\nFirst diagnostic<\/th>\nPrimary formulation route<\/th>\n<\/tr>\n<\/thead>\n
Faces adhere after stacking or rewinding<\/td>\nConditioned block test<\/td>\nAnti-blocking additive<\/td>\n<\/tr>\n
High drag during transport or converting<\/td>\nStatic and dynamic friction<\/td>\nSlip additive<\/a><\/td>\n<\/tr>\n
Tacky surface immediately after cure<\/td>\nDrying or cure verification<\/td>\nProcess and binder correction first<\/td>\n<\/tr>\n
Craters or incomplete substrate coverage<\/td>\nWetting and surface-tension check<\/td>\nWetting additive<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>
Original diagnostic map: identify the failure mode before selecting an anti-blocking additive.<\/figcaption><\/figure>\n

Which Longchang anti-blocking route should you screen?<\/h2>\n\n\n\n\n\n\n\n\n
\u4ea7\u54c1<\/th>\nBest first-screen situation<\/th>\nSupplier starting range<\/th>\n\u91cd\u8981\u89c2\u5bdf\u70b9<\/th>\n<\/tr>\n<\/thead>\n
CHLUMIFE\u00ae 3482 \/ 3482X<\/strong><\/a><\/td>\nWater-based coating or ink where anti-sticking and friction reduction are the main needs<\/td>\n0.05\u20131% on total formulation<\/td>\nWater-based only; pre-dilution is required; check pinholes and freeze protection<\/td>\n<\/tr>\n
CHLUMIFE\u00ae 3166<\/strong><\/a><\/td>\nDry feel, smoothness, scratch resistance, and anti-blocking must be balanced across a wider system range<\/td>\n0.05\u20131%<\/td>\nCheck pinholes, whitening, and foam stabilization<\/td>\n<\/tr>\n
CHLUMILE\u00ae 3032<\/strong><\/a><\/td>\nA reactive, more durable surface route is needed in an oil-based, solvent, or UV system<\/td>\n0.01\u20131%<\/td>\nConfirm functional-group compatibility and avoid uncontrolled additive combinations<\/td>\n<\/tr>\n
CHLUMIAG\u00ae 2750 \/ 2760 \/ 2780 \/ 2505<\/strong><\/a><\/td>\nRadiation-curable or solvent\/acrylic systems requiring reactive surface control; 2780 is the anti-blocking comparison point<\/td>\n0.1\u20133%<\/td>\nNot listed for water-based systems; check cure, intercoat adhesion, and later converting<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Dosages above reproduce the supplier\u2019s published starting ranges. The lowest effective level is normally the best place to begin because excess surface-active material can create pinholes, intercoat-adhesion loss, foam stabilization, migration, or printability problems.<\/p>\n

A practical anti-blocking trial plan<\/h2>\n

1. Freeze the control formulation<\/h3>\n

Use one production-representative control with the same resin lot, pigment or filler level, solvent or water balance, film weight, substrate treatment, and cure schedule. Do not change the additive and the drying process in the same comparison.<\/p>\n

2. Test a compact dosage ladder<\/h3>\n

Prepare a blank plus three dosage levels around the supplier\u2019s suggested range. Record whether the additive was pre-diluted, the dilution medium, addition stage, mixing energy, and time between preparation and application.<\/p>\n

3. Condition samples before contact<\/h3>\n

Evaluate both early handling and fully conditioned film. State the contact face, load, temperature, humidity, dwell time, and separation method. ASTM D3354<\/a> explains why pressure and temperature can change blocking and provides a quantitative film-to-film separation method. For plastic film and sheeting, ISO 8295<\/a> is a separate method for starting and sliding friction; it should not be used as a substitute for a block test.<\/p>\n

4. Measure the properties an improvement could damage<\/h3>\n

A release improvement is not a pass if the film loses adhesion, gloss, recoatability, printability, sealing performance, or lamination bond. At minimum, compare:<\/p>\n