Polysiloxane Resins — Driving the Green Development of Coatings
As the coating industry accelerates toward safety, environmental protection, health and low-carbon development, solvent-based systems are being phased out by tightening regulation. Polysiloxane (silicone) resins — with their unique Si–O backbone and organic–inorganic hybrid structure — are emerging as the core solution for the next generation of green, high-performance protective coatings.
1. The New Trend: “Green” Environmental Coatings
Conventional solvent-based industrial coatings face six major unsustainable problems:
- High safety risk — flammable hazardous chemicals, elevated transport and storage costs
- High health risk — benzene series, isocyanates and toxic thinners harm workers
- High VOC emissions — typical solvent systems exceed 400 g/L
- Heavy dependence on petroleum — film formers and solvents derived from crude oil
- Short service life — traditional coatings last only 3–5 years
- High carbon footprint — the coating sector emitted ≈1.4–1.5 Mt CO2e in 2025
Health hazards: long-term exposure to benzene series, isocyanates and highly toxic thinners creates occupational risks; VOCs and benzene emissions directly affect the respiratory tract and skin of applicators.
GB 30981.2-2025 Policy Highlights
- New items: SVOC control, mandatory hexavalent chromium testing, coating hazard labelling
- Tightened limits: hexavalent chromium from 50 mg/kg to 8 mg/kg; free isocyanate from ≤0.4% to ≤0.2%
- Solvent-free industrial coatings: VOCs ≤100 g/L; benzene ≤0.1% by mass; Cr(VI) <8 mg/kg
- Judgment rule: all items must pass; any single failure rejects the product — no item waiver; testing labs must hold CMA qualification
- Care: solvent-free coatings that need thinners to lower viscosity at application, and separately sold hardeners or thinners, must also be independently tested
2. Polysiloxane Resin Strategy: Solving the Problems at the Source
Deep-Polymer polysiloxane resins address all four key dimensions — safety & health, compliance, application tolerance and long-term protection:
Safety & Health
| Dimension | Industry Pain Points | Polysiloxane Advantages |
|---|---|---|
| Safety | Hazardous transport cost 2–4×; Class A warehouse cost 2–3×; annual safety spend 15–20% of budget; 65% of coating accidents related to hazardous solvents | Flash point >80 °C, non-hazardous; transport/warehousing/safety costs cut 30%+; safety risk down 90%+ |
| Health | Isocyanates are the leading occupational sensitiser; benzene limit ≤15 g/L; solvent coatings VOCs >400 g/L; 70%+ of application discomfort from solvents/toxic additives | No isocyanates, no heavy metals; on-site harmful concentration down 90%+; low odour, low irritation |
| Environment | 2025 coating VOCs ≈1.2 Mt; GB 30981-2025 adds SVOC control; VOCs >420 g/L taxed 4% excise | Low VOCs; high solids and low viscosity enable high-solid/solvent-free coatings; VOCs reduction 90%+ |
| Low-carbon | ≈1.4–1.5 Mt CO2e in 2025; extreme petroleum dependence; 3–5 year coating life | Carbon content <25%; almost no petroleum dependence; coating life 10–15 years; lifecycle carbon cut 50%+; maintenance cost down 60% |
Compliance (GB 30981.2-2025)
| Policy Requirement | Product Advantage |
|---|---|
| Strictly control VOC release to reduce air pollution | Source reduction — easily meets and exceeds new national standard limits |
| Ban or restrict specific heavy metals and toxic chemicals | RoHS-compliant, safe application and environment-friendly |
| Promote clean production, cut organic solvents and carbon emissions | Large reduction in VOCs, aligned with national clean-production strategy |
| Drive high-quality development, extend infrastructure life | Fewer maintenance cycles, lower lifecycle cost |
Application Tolerance
- Viscosity 100–500 cp with resin solids >95% — no large amounts of thinner needed at application
- Humidity/temperature insensitive — stable application across conditions
- Surface-dried film is largely unaffected by rain
Full Life-Cycle Long-Term Protection
- High solids at application, VOCs compliant with new national standards; non-hazardous, low risk to people and environment
- Excellent weatherability (QUV-A >5000 h, outstanding gloss and colour retention) and corrosion resistance (salt spray >3000 h) — significantly extended service life
- Resin active content up to nearly 100% enables high-solid and solvent-free coatings; low-carbon and aligned with dual-carbon goals
Sustainability Comparison
| Conventional Industrial Coatings | Polysiloxane Coatings | |
|---|---|---|
| Service life | 5–10 years | 10–15 years |
| Application VOCs | >400 g/L (solvent-based) | <100 g/L |
| Safety | Flash point 20–40 °C, hazardous chemical | Flash point >60 °C, non-hazardous |
| Health | Rich in benzene series, ketones, isocyanates | No toxic or harmful components |
| Carbon content | >80% | <40% |
| Feedstock | Film formers and solvents from petroleum | Key raw materials and process independent of petroleum |
3. Deep-Polymer Polysiloxane Resin — Material Properties
Polysiloxane is an organic–inorganic hybrid polymer with a repeating (–O–Si–O–Si–) backbone and organic groups bonded directly to silicon atoms.
| Bond type | UV ray | C–H | C–C | Si–O |
|---|---|---|---|---|
| Bond energy (kJ/mol) | 411 | 414 | 351 | 446 |
The exceptionally strong Si–O bond (446 kJ/mol) is the foundation of polysiloxane’s superior weatherability and thermal stability.
Technical Innovation
- Organic–inorganic hybrid technology — combines the flexibility of organic resins with the stability of inorganic siloxane, forming a “glass skeleton + rubber joint” structure that overcomes the brittleness and poor weatherability of traditional coatings.
- High solids, low viscosity — resin materials with >98% active content enable high-solid/solvent-free coatings, dramatically cutting VOCs for full life-cycle protection; no large amounts of thinner needed.
- Excellent comprehensive performance — coatings achieve QUV-A >6000 h and salt spray >3000 h (with primer, 2-coat system).
4. Featured Product Portfolio — Anti-Corrosion Applications
| Item/System | Epoxy Polysiloxane DPM-219E | Acrylic Polysiloxane DPM-2110E | DPM-305 | DPM-306 | PU System | Fluorocarbon System |
|---|---|---|---|---|---|---|
| Resin solids / viscosity | 84%±2% / 500–2500 cp | 97%±2% / 150–500 cp | 70%±2% / 500–3000 cp | 75%±2% / 400–1500 cp | 40–75% / 1000–5000 cp | 50–70% / 1000–3000 cp |
| Coating solids | >90% | >95% | >75% | >80% | 50–75% | 60–70% |
| Application VOCs | <200 g/L | <100 g/L | <350 g/L | <240 g/L | >350 g/L | >400 g/L |
| Si–O bond content (full paint) | >29% | >20% | >15% | >23% | / | / |
| Core features | Excellent weatherability, high Si–O, high solids | Excellent corrosion resistance & weatherability, solvent-free | Cost control, meets 4755 standard | Excellent weatherability, high cost performance | Mature system, lower cost, good decoration | Mature system, stable weatherability |
| Applications | High-solid ultra-weathering anti-corrosion topcoat | Solvent-free weathering anti-corrosion topcoat | PFAS-free cost-effective anti-corrosion topcoat | PFAS-free high-performance anti-corrosion topcoat | General anti-corrosion topcoat | Long-life weathering topcoat |
5. Featured Product Portfolio — High-Temperature Applications
| Item | Dile® Siloxane Polymer DPM-113 | DPM® Single-Component Epoxy Polysiloxane DPM-4 Series |
|---|---|---|
| Resin solids | >98% | 50%±2% |
| Viscosity | 20–50 cp | 50–200 cp |
| Long-term temperature range | 600–800 °C | 300–500 °C |
| Components / curing | Two-component, room-temperature cure | Single-component, high-temperature cure (surface dry at room temperature) |
| Core features | Excellent stability, corrosion resistance, ageing resistance, insulation and voltage resistance at high temperature; smokeless under open flame, A1 non-combustible | Excellent stability, corrosion resistance, high adhesion, acid/alkali resistance and voltage resistance at high temperature |
6. Epoxy Polysiloxane DPM-219E
Product Highlights
- Ultra-weathering long-term protection: outstanding gloss & colour retention, excellent corrosion resistance
- Safe, green, healthy, low-carbon: non-restricted goods, low VOCs, isocyanate-free
- High solids, low viscosity: coating solids at application >90%
Pain points solved: short service life (severe gloss/colour loss within 2–3 years) and safety/health compliance costs of hazardous chemicals.
Applications: high-solid topcoats for ultra-weathering protection in petrochemical, refining, marine engineering and industrial protection.
DPM-219E Product Data
| Item | Data |
|---|---|
| Non-volatile content | 82.00–86.00% |
| Specific gravity | 1.00–1.20 |
| Viscosity | 1000–2000 cps |
| Si–O bonds (full paint) | >29% |
| Hardener | DPM-207 / DPM-208 |
| Application | High-solid ultra-weathering topcoat |
| Solids after standard formula ripening | >90% |
| Application VOCs | <200 g/L |
| Surface dry (25 °C / 60% RH) | <60 min |
| Hard dry (25 °C / 60% RH) | <24 hrs |
| Safety | Transportable/storable as non-restricted goods |
DPM-219E Weathering Performance
QUV-A 5000 h: gloss retention >90%, ΔE <0.5. QUV-B 2000 h: gloss retention >70%, ΔE <1.0. (Base formulation, no UV absorbers or light stabilisers, hardener DPM-208.)
7. Epoxy Polysiloxane DPM-2110E
Product Highlights
- Heavy-duty long-term protection: excellent corrosion and ageing resistance
- Safe, green, healthy, low-carbon: non-restricted goods, low VOCs, isocyanate-free
- Solvent-free, low viscosity: coating solids at application >95%, no thinner required
Pain points solved: limited life in heavy-duty protection; GB 30981-2025 compliance — VOCs <100 g/L, non-hazardous.
Applications: solvent-free topcoats for heavy-duty anti-corrosion protection or non-hazardous low-VOC long-term protection.
DPM-2110E Product Data
| Item | Data |
|---|---|
| Non-volatile content | 95.00–98.00% |
| Specific gravity | 1.00–1.20 |
| Viscosity | 100–500 cps |
| Si–O bonds (full paint) | >20% |
| Hardener | DPM-206 |
| Application | Solvent-free heavy-duty anti-corrosion topcoat |
| Solids after standard formula ripening | >95% |
| Application VOCs | <100 g/L |
| Surface dry (25 °C / 60% RH) | <30 min |
| Hard dry (25 °C / 60% RH) | <3 hrs |
| Safety | Transportable/storable as non-restricted goods |
DPM-2110E Weathering & Corrosion Performance
QUV-A 3000 h: gloss retention >60%, ΔE <3. (Base formulation, no UV absorbers or light stabilisers, hardener DPM-206.)
Salt spray test (3000 h): substrate sandblasted steel with conventional epoxy primer (45–65 μm); topcoat from Deep-Polymer polysiloxane resin, total sprayed film 120–150 μm. Result: after 125 days (3000 h) salt spray — no rust spots, blistering or peeling, no obvious gloss loss.
8. Epoxy Polysiloxane DPM-306
Product Highlights
- Surpasses 4755 standard: QUV-A >6000 hrs, Si–O >23%
- Consistent long-term performance: backed by extensive lab data and end-user projects
- Top-tier enterprise endorsement: stable quality control
Pain points solved: PFAS restrictions and design-institute specs — isocyanate- and fluoride-free with long-term protection; high cost performance resolving the conflict between cost control and long-term protection.
Applications: long-life protective topcoats surpassing 4755 standard with excellent gloss and colour retention.
DPM-306 Product Data
| Item | Data |
|---|---|
| Non-volatile content | 73.00–77.00% |
| Specific gravity | 0.95–1.15 |
| Viscosity | 500–1500 cps |
| Si–O bonds (full paint) | >23% |
| Hardener | DPM-207 / DPM-208 |
| Application | High-performance weathering topcoat |
| Application VOCs | <240 g/L |
| Surface dry (25 °C / 60% RH) | <45 min |
| Hard dry (25 °C / 60% RH) | <20 hrs |
DPM-306 Weathering Performance
QUV-A 6000 h: gloss retention >75%, ΔE <0.2. QUV-B 2000 h: gloss retention ≈70%, ΔE <1.0. (Base formulation, no UV absorbers or light stabilisers, hardener DPM-207.)
9. Deep-Polymer Polysiloxane Resin Selection Guide
Choose your grade by target weathering performance (QUV-A hours) and required solid content:
- Highest weathering (QUV-A >6000 h): DPM-306 for premium, PFAS-free long-life topcoats
- Ultra weathering (QUV-A >5000 h) + high solids:DPM-219E for high-solid ultra-weathering topcoats
- Solvent-free & fast dry (QUV-A >3000 h): DPM-2110E for solvent-free heavy-duty topcoats
- High-temperature service: DPM-113 (600–800 °C) and DPM-4 series (300–500 °C)
Summary
Deep-Polymer polysiloxane resins deliver the complete green-coating package: low VOCs and solvent-free formulations, full GB 30981.2-2025 compliance, superior weatherability and corrosion resistance, extended life-cycle protection and reduced total cost of ownership. Whether you are formulating high-solid anti-corrosion topcoats, PFAS-free systems or high-temperature protective coatings, our polysiloxane portfolio is engineered to help you lead the green transition.
Contact Deep-Polymer at sales@deep-polymer.com or on WhatsApp (+86 13602885871) for technical data sheets and samples.
