Jiaxing Rstone Chemical Co., Ltd.

30/10/2026

Two identical-looking craters can have completely different cause

One comes from wet-film retraction driven by contamination and surface tension. Another comes from a bubble that burst inside the film. A photo of the dry film shows the shape — not the process.

In this technical note we connect three things: appearance, when it appears, and at which layer the failure sits.
▸ Craters vs. pinholes vs. solvent popping — and how cross-sections tell them apart
▸ Controlled trials for contamination vs. air entrainment
▸ Flocculation, metallic mottling, white haze, lifting, bleeding and sagging — each with its own test logic
▸ A diagnostic decision table built on ISO 4628-2 and published industry references

Full article in the first comment. 👇

Send a message to learn more

23/10/2026

Here's a quick one for anyone working with silver metallic coatings: brightness is an angle question.

Aluminum flakes act like tiny mirrors. The "flop" you see — bright face, darker side — depends on flake shape, how they're aligned in the film, and how the wet film flows. A bright front view proves nothing on its own.

Read silver from at least three angles. Record multi-angle L* and the FI together with the instrument and method. And remember: a high FI just means strong contrast — it isn't automatically "best" for every job.

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13/10/2026

Picking a resin for waterborne UV silver coatings? Don't start with the datasheet — start with the finished film.

The metallic look is a team effort: aluminum flake shape, flake orientation, formulation flow, film formation and UV cure. Miss one, and it shows up in the appearance, the recoat, the adhesion and the cure — all at once.

Over the next few posts we'll unpack five practical questions that make silver-resin selection reproducible. Follow along.

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09/10/2026

🎉 诚邀莅临 | You're Invited!

锐石化工邀您共聚 2026 中国国际涂料展 CHINACOAT 2026！
RSTONE warmly invites you to visit us at CHINACOAT 2026!

📅 时间 Date：2026年11月11日–13日（Nov 11–13, 2026）
📍 展位 Booth：4.2 G43
🏢 地址 Venue：广州·中国进出口商品交易会展馆A区
(Guangzhou China Import and Export Fair Complex, Area A)

届时我们的技术专家将在现场，与您面对面交流水性树脂与涂料解决方案。
Our technical experts will be there in person — let's talk waterborne resins & coatings!

🎫 免费注册码 Free registration code：EUAHFPFW（扫码即报 / Scan the QR to register）

期待与您在广州相见！See you in Guangzhou! 🇨🇳

#锐石化工 #水性树脂 #涂料展

30/09/2026

🌧 Sunny day: crisp metallic sparkle. Rainy day: grey, mottled panels.

Before you swap the aluminum pigment — read this.

"Greying" is a symptom, not a mechanism. Rainy weather stretches your drying window: high humidity weakens the push for water leaving the wet film, the film stays open longer, and flake orientation keeps shifting until the metallic effect collapses.

Our diagnostic order:
1️⃣ Cross-check fresh vs. stored paint against normal vs. rainy conditions
2️⃣ Record part temperature, flash-off and airflow — the oven setpoint is NOT the part temperature
3️⃣ Verify pigment passivation + pH window together (aluminum + water can release hydrogen — follow the SDS, never rescue a batch with acid or alkali)
4️⃣ THEN decide: process window, resin, or pigment

One practical trick from our notes: preheat bare parts at ~50 °C for 5 minutes in cold, humid weather.

29/09/2026

⚖️ Waterborne UV high-gloss: thicken the formula, the fat edges disappear — and the flats break out in orange peel. Loosen it up, and the edges come back.

This see-saw isn't a viscosity problem. Edges need accumulation limited; flats need roughness leveled. Both happen in the same wet film, before the water is gone and the UV lamp fires.

How to break the loop:
📍 Find WHEN the edge builds: at deposition (gun path & geometry) vs. during flash-off (flow & surface tension) — different problems, different fixes
⏱ Recovery too slow → film keeps moving. Too fast → spray marks never level out
🧪 A resin change shifts water content, solids, rheology AND film formation at once — compare on a matched solids basis
💡 Dewatering and UV cure are accepted separately: more UV cannot substitute for removing water. A rough pre-cure surface just gets locked in

Formula and process aren't about "faster is better" — they're about the right sequence.

28/09/2026

🎯 Your leveling additive fixed the craters… and broke your recoat adhesion.

It's a classic trap: first dose looks better, more dosage doesn't finish the job, and the clearcoat starts peeling between coats.

The truth: wetting, leveling and intercoat adhesion are controlled by different factors. One additive can fix one and expose another's weakness.

What to do instead:
🔍 Classify the defects first — retraction craters and burst-bubble pinholes need different fixes
⏱ Watch dynamic surface tension, not just static values — spraying creates new surfaces faster than additives can reach them
📉 Dosage is not a monotonic benefit — re-check foam, intercoat wetting and storage after every increase
📍 Read the failure location: interfacial delamination, film tearing and substrate adhesion loss are three different problems

An additive has passed only when it fixes the target defect AND protects downstream performance.

Send a message to learn more

24/09/2026

🌕 Happy Mid-Autumn Festival from RSTONE!

Wishing you and your family a warm reunion and a bright season ahead.

Thank you for another year of trust — under the same moon, we'll keep delivering on time. 🥮

— The RSTONE Team | Jiaxing RSTONE Chemical Co., LTD

21/09/2026

🧪 Two buckets of paint. Same cup seconds. One sprays into orange peel, the other sags down the verticals.

Sound familiar? The cup reading only describes ONE measurement state — it says nothing about what happens inside the spray gun, how the wet film recovers after it lands, or how it dries.

Quick checklist before your next adjustment:
✔ Record shear rate + waiting time with every viscosity reading
✔ Shear thinning ≠ thixotropy — recovery over time is a separate test
✔ A good flow window = atomization in the gun + spreading on the part + stand-up on verticals, all at once
✔ Find which stage the defect starts in (spray / deposition / drying) BEFORE changing the formula

Cup seconds are for shop-floor control. They don't replace rheology testing.

📩 Coating problem you can't pin down? Our technical team works through cases like this every week.

08/09/2026

✨ Ultimate Baby-Skin Soft Touch | UV Excimer Touch Series

Achieving a silky, skin-like matte feel on coated surfaces has never been easier. With our UV Excimer Touch Series, you can deliver a velvety, ultra-smooth finish that feels like a baby's skin.

🔬 What is an Excimer?
Excimer (excited dimer) refers to a transient molecule formed through a series of physical and chemical reactions triggered by the excitation of a gas mixture (inert gases or halogen gases) by external energy. Its lifespan is just tens of nanoseconds. Different wavelengths of excimer ultraviolet light are produced by filling the resonant cavity with different gas mixtures.

Excimer technology is one of the three main routes to a skin-like feel in paints, alongside traditional coatings and film transfer.

📏 Peak Wavelengths of Rare Gas Halide Excimers (nm)
NeF 108 · ArF 193 · ArCl 175 · ArBr 165
KrF 248 · KrCl 222 · KrI 190 · XeF 351
XeCl 308 · XeBr 282 · XeI 253

⚙️ How Excimer UV Curing Works
1. The UV coating is first pre-cured by an LED light source.
2. It is then irradiated by a 172nm or 254nm light source to form micro-wrinkles on the coating surface, achieving a matte and velvety effect.
3. Finally, the coating is further cured by a mercury lamp to enhance the paint film's performance, ultimately achieving a skin-like feel.

💡 Note: Since ultraviolet light in the 160-240nm range converts oxygen in the air into ozone, a key difference between 172nm and 254nm products is that 172nm products need to be used in nitrogen to isolate oxygen and avoid ozone generation.

🧪 UV Excimer Resin Series

▶ RD 1024
• Suitable for both 172nm and 254nm excimer curing processes.
• Excellent skin-like feel, smoothness, good scratch resistance, and adhesion.

▶ RD 1027
• Suitable for both 172nm and 254nm excimer curing processes.
• Excellent skin-like feel, smoothness, superior abrasion resistance, and good adhesion.

📊 Product Performance
RD 1024 / RD 1027
• Gloss 60°: 2.3 / 2.2
• Gloss 85°: 12.6 / 12.4
• RCA: >1000 (15μm) / >1000 (23μm)
• Butanone Wipe/500g: 200 cycles ok / 1000 cycles ok
• Hardness/750g: 2H / H
• Water Resistance: 5B @ 85℃×2h / 5B @ 85℃×8h
• Chemical Resistance (65℃, 90%RH, 3d): organic acid / organic base / sunscreen — all passed for both grades

🎨 Appearance: available in both coarser and finer texture options (×200).

🛠️ Recommended Coating & Process
▶ RD 1024
Application: Spraying 20μm — Baking 60℃×10min
Curing: Pre-curing 395nm UV-LED 60 mJ/cm² → 254nm curing 260 mJ/cm² → Mercury lamp curing 500-650 mJ/cm²

▶ RD 1027
Application: Spraying 25μm — Baking 60℃×5-10min
Curing: Pre-curing 395nm UV-LED 120 mJ/cm² → 254nm curing 200 mJ/cm² → Mercury lamp curing 500-650 mJ/cm²

📦 Product Information
• Type: Water-based UV Skin-like Feel Resin
• Appearance: Milky white liquid
• Viscosity/25℃: ≤1000 cP (RD 1024) / ≤1200 cP (RD 1027)
• Solid Content: 50 wt%
• pH: 6-9

📞 Interested? Contact us for samples and technical support:
RSTONE — Pioneer of Environment-Friendly UV-Curable New Materials
email: [email protected]
Web: www.rstone-resin.com