SEMITECH KR-12 — Isopropyl Tri(dioctyl phosphato) Titanate
KR-12 is synthesized from TTIP and dioctyl phosphate (DOP). TTIP availability tracks titanium sponge output; 2-EH (DOP precursor) has lower volatility with broad Chinese petrochemical supply. Contract prices ranged $9–14/kg ex-works China in Q1 2025.
Technical Specifications
| Raw Material | Key Source Region | 2025 Price Range | Supply Risk |
|---|---|---|---|
| Titanium Tetraisopropoxide (TTIP) | China, Japan, USA | $8–12/kg | Medium — aerospace/battery demand competing |
| Dioctyl Phosphate (DOP) | China (Nanjing, Zibo hubs) | $2.5–4.0/kg | Low — broad petrochemical base |
| 2-Ethylhexanol (2-EH) | China, USA, Europe | $900–1,200/MT | Low–Medium — propylene-oxo linked |
| KR-12 finished product | China specialty producers | $9–14/kg EXW | Medium — limited qualified suppliers |
Chemistry & Coupling Mechanism
KR-12 is isopropyl tri(dioctyl phosphato) titanate. The isopropoxide moiety hydrolyzes and bonds to hydroxyl groups on metal oxides, iron oxide pigments, or silicate fillers. The three dioctylphosphate arms extend into the organic binder, forming a monomolecular compatibility layer. The phosphate ester chelation of Fe²⁺/Fe³⁺ at steel surfaces is the direct basis for KR-12's anti-corrosion activity in primers.
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Industrial Coatings & Anti-Corrosion Performance
In epoxy primers, 0.5–1.0 wt% on pigment weight increases cross-hatch adhesion 10–20% (ASTM D3359) and extends salt-spray resistance 200–400 hours (ASTM B117). In alkyd anticorrosive coatings, KR-12 improves 60° gloss by 3–6 units and is compatible with chrome-free inhibitor packages (zinc phosphate, calcium silicate).
Resin System Compatibility
Compatible with epoxy, alkyd, polyurethane, acrylic, and chlorinated rubber systems. Loading: 0.5–1.5% on total pigment/filler weight. Pre-dilute in xylene at 10–20% solids before grind stage. For waterborne systems, pre-hydrolyze in IPA/water 9:1 for 15 minutes before dispersion.
Frequently Asked Questions
+Q: What distinguishes KR-12 from KR-9S or KR-46B?
A: KR-12's phosphate esters chelate Fe²⁺/Fe³⁺ for anti-corrosion activity. KR-9S suits polyolefin compounds. KR-46B has mixed phosphite/phosphate for processing above 200°C — beyond KR-12's 180°C ceiling.
+Q: What is the correct addition level in an epoxy anti-corrosion primer?
A: 0.5–1.0 wt% on total pigment/filler weight, pre-diluted in xylene at the grind stage. Above 1.5% increases viscosity without proportional benefit.
+Q: Can KR-12 be used in waterborne coatings?
A: Yes — pre-hydrolyze in IPA/water 9:1 for 15 minutes before adding to the aqueous phase. Direct addition causes Ti–O–Ti oligomerization. Dosage 0.5–0.8% on solid pigment weight.
+Q: Is KR-12 compliant with REACH and RoHS?
A: KR-12 (CAS 65345-34-8) is not on the SVHC Candidate List as of Q1 2025. No heavy metals, halogens, or restricted phthalates. Confirm current SDS for regulatory updates.
+Q: What are the storage requirements?
A: Sealed containers below 30°C, nitrogen blanket for opened containers. Shelf life 24 months. Flash point >100°C closed cup.
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