Nitrocellulose (NC) Lacquer Paint – Milky White formula requires balancing clarity, whiteness, adhesion, drying speed, and smooth flow.
🎨 NC Lacquer – Milky White Paint (100 kg Batch)
| S.N. | Raw Material | Qty (kg) | Function |
|---|---|---|---|
| 1 | Nitrocellulose (RS Type 70%) | 18.0 | Main binder – forms film |
| 2 | Plasticizer (DOP or DBP) | 5.0 | Flexibility and adhesion |
| 3 | Alkyd Resin (Short oil) | 10.0 | Toughness, flexibility, gloss |
| 4 | Titanium Dioxide (Rutile) | 15.0 | Opacity, whiteness |
| 5 | Zinc Stearate | 1.5 | Smooth feel, anti-settling |
| 6 | BYK-410 / 4510 | 0.3 | Leveling agent |
| 7 | Anti-settling agent (e.g., Bentone) | 0.5 | Prevents pigment settling |
| 8 | Butyl Acetate | 10.0 | Solvent – balances drying |
| 9 | Toluene | 20.0 | Fast-drying solvent |
| 10 | Xylene | 15.0 | Medium-evaporation solvent |
| 11 | Methanol / IPA (optional) | 3.0 | Improve flow and compatibility |
| 12 | Silicone Additive (e.g., BYK-333) | 0.2 | Mar resistance, flow improvement |
| Total | 100 kg |
💡 Notes:
- Adjust solvent blend depending on drying speed and application method (spray, dip).
- For more milkiness, increase TiO₂; for translucent milky, reduce it to 8–10 kg.
- NC 70% RS includes 30% isopropanol; pure solids may need adjustment.
- Ensure proper dispersion of pigments and zinc stearate in premix.
- For best gloss and leveling, maintain proper solvent balance and avoid excessive fast solvents.
Here’s a detailed Manufacturing Process for Milky White Nitrocellulose Lacquer Paint, divided into professional production stages. This includes Premixing, Grinding, Let-down (Make-up), and Final Adjustments. Based on your lab/process knowledge, this is a scalable and industry-proven workflow:
🏭 MANUFACTURING PROCESS FOR MILKY WHITE NC LACQUER PAINT
🔹 1. Premixing Stage (Pigment Dispersion)
Purpose: Wet and pre-disperse pigments and additives into solvent & resin base.
✅ Steps:
- Charge the mixing vessel with part of the solvent blend:
- Xylene (5 kg)
- Butyl Acetate (5 kg)
- Add wetting and dispersing agents:
- BYK-410 or equivalent
- Anti-settling agent (Bentone, pre-activated in solvent)
- Slowly add Titanium Dioxide under agitation.
- Add Zinc Stearate and mix until homogeneous.
- Add a portion of Alkyd Resin (around 5 kg) to improve pigment wetting.
- Mix under high-speed disperser for 30–45 minutes until full dispersion (check with Hegman gauge; target <15 μm).
🔹 2. Grinding Stage
Purpose: Break down pigment agglomerates to fine particle size.
✅ Options:
- Use bead mill or triple roll mill
- Target grind fineness: ≤10 μm
Tip: If you don’t have high-shear or bead mill, extend dispersion time with high-speed dissolver.
🔹 3. Let-Down (Make-up Stage)
Purpose: Complete formulation by adding film formers, plasticizers, and remaining solvents.
✅ Steps:
- Transfer the milled paste into a clean let-down tank.
- Add:
- Remaining Nitrocellulose solution (in xylene or IPA)
- Remaining Alkyd Resin
- Plasticizer (DOP or DBP)
- Silicone additive (BYK-333)
- Add remaining solvents (Toluene, Xylene, Methanol/IPA) to reach the desired viscosity.
- Stir gently (low RPM) to prevent foam and air entrapment.
🔹 4. Filtration & Quality Check
Purpose: Ensure product is clean, uniform, and within spec.
✅ Steps:
- Filter through 100–150 mesh nylon filter.
- Check:
- Viscosity (Ford Cup B4) – Adjust with solvent
- Opacity
- Gloss
- Drying time (touch dry & hard dry)
- Flow & leveling
🔹 5. Packing
- Pack in tin or HDPE-lined containers.
- Use nitrogen blanketing if storage exceeds 3 months.
- Label with flammability warning and batch number.
🧪 Testing Properties & Standards for NC Lacquer Paint (Milky White)
| S.N. | Property | Test Method / Standard | Typical Requirement / Limit |
|---|---|---|---|
| 1 | Viscosity (B4 Ford Cup) | IS 101 (Part 1/Sec 5) / ASTM D1200 | 15–30 seconds @ 25°C |
| 2 | Gloss at 60° | ASTM D523 | ≥ 70 gloss units (for high gloss) |
| 3 | Opacity / Hiding Power | IS 101 (Part 4/Sec 1) / ISO 6504-3 | Contrast ratio ≥ 0.96 |
| 4 | Drying Time (Surface dry) | IS 101 (Part 3/Sec 1) | ≤ 10 minutes (Air dry at 30°C) |
| 5 | Drying Time (Hard dry) | IS 101 (Part 3/Sec 1) | ≤ 30 minutes |
| 6 | Film Thickness (DFT) | ASTM D1005 / ISO 2808 | 20–25 microns (single coat) |
| 7 | Adhesion (Cross Hatch) | ASTM D3359 | 4B or 5B (Excellent adhesion) |
| 8 | Flexibility (Mandrel bend) | ASTM D522 | No cracking on 6 mm mandrel |
| 9 | Impact Resistance | ASTM D2794 | Pass ≥ 1 kg.cm (variable based on system) |
| 10 | Hardness (Pencil Hardness) | ASTM D3363 | ≥ H (for milky white) |
| 11 | Scratch Resistance | ASTM D7027 / IS 101 | No visible scratch at 2N load |
| 12 | Resistance to Water (24h) | IS 101 (Part 6/Sec 1) | No whitening, softening, or blistering |
| 13 | Resistance to Petrol | IS 101 (Part 6/Sec 2) | No softening after 1-hour immersion |
| 14 | Storage Stability | In-house / IS 101 guideline | Stable for 6–12 months |
| 15 | Appearance | Visual | Uniform, milky white, no sedimentation |
📌 Notes:
- Always confirm with customer or industry-specific requirements.
- For aerosol or automotive grades, extra tests like UV resistance or recoatability may apply.
- Accelerated aging can be done via QUV (ASTM G154) if needed.
