In the synthetic-leather polyether-modified silicone (PES) leveling agent spectrum, the "EO/PO ratio and chain length" of polyether side-chains and the "molecular weight (viscosity window)" of the polysiloxane backbone jointly dictate surface-tension depression on PU/PVC leather, dry-wet boundary of slick hand-feel, and extension of release-paper demold cycles. Conventional dimethyl silicone levelers lower tension but have narrow compatibility and cause oil-spot cratering; low-viscosity (<100cSt) PES spreads too fast, leaving uneven marks on frosted/fine-grain leather. As PU/PVC artificial leather demands "dry-full hand-feel + mirror/frosted/textile/fine-grain full coverage + release-paper 5+ reuses + non-haz," sourcing a pale-yellow transparent polyether-polysiloxane leveler with viscosity 500-1000mm²/s (25℃), nD 1.4250-1.4450, dosage 0.1-1% has become the core gap for domestic synthetic-leather slick-leveler localization.
Addressing this "leather dry-slick" pain point,
Anhui IOTA Silicone Oil Co., Ltd. (IOTA) officially launches
Leveling Agent IOTA 21565 (polyether-modified polysiloxane). Characterized by "pale-yellow transparent liquid, viscosity 500-1000mm²/s (25℃), refractive index 1.4250-1.4450, dosage 0.1-1% (add at any production stage), 25L/200L PE or iron drum, non-haz transport, cool dry sealed 24-month shelf," and backed by "polyether-siloxane block tension-drop + mid-vis 500-1000cSt even-level + dry-slick anti-scuff dual-effect," it serves as the "slick anchor" for PU/PVC leather mirror/flat/textile/frosted/fine-grain dry hand-feel and release-paper reuse.
Molecular Architecture: Polyether Block + Mid-Vis Even-Level + Dry-Slick Anti-Scuff 3D Logic
The core competitiveness of IOTA 21565 stems from its "polyether segments (random or block EO/PO) grafted/blocked onto polysiloxane backbone" nonionic surfactant architecture:
-
Polyether-Siloxane Block Tension-Drop: Polyether hydrophilic segments depress surface tension (to <25mN/m), forcefully wet PU/PVC micro-pores and release-paper grain, eliminating pinholes/craters from tension differences; polyether highly compatibilizes with PU polar groups (urethane, ester), no oil-bleed, no migration.
-
Mid-Vis 500-1000cSt Even-Level: Viscosity in this window—below it spreads too fast leaving marks, above it needs high shear to disperse; natural leveling time is moderate, mirror leather no flow-lines, frosted/fine-grain sharp and clear.
-
Dry-Slick Anti-Scuff Dual: Polyether grants "dry, full" tactile (non-greasy, non-cold), siloxane backbone gives low COF (slick); combined, leather resists nail-scratch and fold-friction; after release-paper coating, demold force stays low—single paper reusable 5-8× (vs. conventional 2-3×), cutting cost >50%.
Performance Leap: From "Dimethyl Silicone Oil-Spot" to "Polyether Silicone Dry-Even"
Incorporating IOTA 21565 enables qualitative leaps:
-
Dry-Full Hand-Feel: 0.3-0.8% in dry/wet PU—COF -40-60%, feel shifts from "greasy-cold" to "dry-warm," mirror gloss uniform, frosted grain crisp.
-
Anti-Crater Full-Cover: Effective on mirror, flat, textile, frosted, fine-grain—eliminates pinholes, edge-shrink from tension unevenness, first-pass yield +10-15%.
-
Release-Paper Reuse Doubled: 0.1-0.3% on release-paper—stable demold, no stick, no residue; reuse 2-3× → 5-8×, single-sheet cost halved.
-
Anti-Scuff Lifted: Nail-scratch and Martindale cycles +20-30%, fits shoe-upper and furniture leather high-frequency contact.
Application Penetration: From Mirror Leather to Fine-Grain Furniture
IOTA 21565 covers sectors triply sensitive to "dry hand-feel + leveling anti-crater + release-paper reuse":
-
PU/PVC Artificial Leather: Dry-process PU topcoat, wet-process substrate finish, PVC calendered surface coating.
-
Special Grains: Mirror, flat, textile-print, frosted, fine-grain full coverage.
-
Release-Paper Process: Release-paper pre-coat, multi-reuse demold protection.
-
Coatings & Inks: Extendable to PU wood coatings, plastic paints for leveling/slick (requires validation).
IOTA Technical Guide: Any-Stage, Micro-Dose Even-Mix
-
Add Timing: Add at any stage of PU/PVC slurry production (pre-mix, post-mill, vis-adjust all OK), 0.1-1% (recommend start 0.3-0.6%), low-speed stir 10-15min for uniform.
-
Release-Paper Coating: Dilute IOTA 21565 5-10× with EtOH/IPA, coat on release-paper, dry 60-80℃×1-2min to form micro-film, then cast PU slurry; or add directly to paper pre-treat bath.
-
Taboo Red Line: Non-haz but moisture-seal (polyether end absorbs humidity → viscosity drifts, premature reaction); avoid direct co-exist with strong cationic curatives (polyether may flocculate); store 5-35℃, avoid >40℃ causing polyether oxidative yellowing.
-
Storage: 25L/200L PE or iron drum; cool dry sealed; shelf 24 months, re-inspect appearance/viscosity/nD and extend if qualified; non-haz transport.
Industry experts note that under synthetic leather consumption upgrade (dry hand-feel becoming standard), release-paper cost surge, and PU/PVC process refinement, mid-viscosity polyether-modified silicone levelers are upgrading from "Evonik/TEGO import followers" to "dry-slick + release-paper-reuse reference auxiliaries." IOTA 21565, with its "500-1000cSt mid-vis + nD 1.4250-1.4450 + 0.1-1% micro-dose instant + 24-month stable" hard metrics,
fills the domestic supply chain gap for polyether-modified polysiloxane leveling agents in PU/PVC leather dry-hand and release-paper reuse fields, providing a mass-producible path to replace imported Evonik TEGO Glide series, Tego Flow series for downstream leather and release-paper plants. This confirms domestic synthetic-leather auxiliaries are advancing steadily along "dimethyl silicone → low-vis PES → mid-vis dry-slick type," with growing technical say in artificial-leather surface-treatment key materials.
