D200R vs D262R vs D265R should be decided by resin system, pigment and published dosage evidence. DP-D200R is a broad solvent coating and organic-bentonite route without a public dosage. DP-D262R targets solvent 2K/thermoset carbon-black work and explicitly excludes thermoplastic acrylic and epoxy floors. DP-D265R supports solvent coatings/inks and thermoplastic acrylic.
All three enter the pigment grind before pigment addition. They are not interchangeable simply because they reduce viscosity.
Resin-and-pigment decision map
| Formulation job | Published boundary | First route |
|---|---|---|
| Organic bentonite slurry or broad industrial/anticorrosion coating | No public dosage; coating applications emphasized | D200R after TDS confirmation |
| Carbon black in solvent 2K/thermoset resin | Not thermoplastic acrylic; not epoxy floor | D262R |
| Organic pigment/high-pigment black in thermoplastic acrylic or solvent ink | Thermoplastic acrylic explicitly supported | D265R |
| Resin falls outside published fit | Do not transfer a neighboring product claim | Run compatibility-first screen |
| Prodotto | Composition/data | Published fit | Evidence gap |
|---|---|---|---|
| D200R | Fatty-acid polyamide polyester solution; DPM; 50% active | Solvent architectural, industrial, anti-corrosion; organic bentonite slurry | No recommended dosage on public page; inks not explicitly listed |
| D262R | Polymer block copolymer; solvent oil; 48±3% solids | Solvent 2K/thermoset; carbon-black color spread/gloss | Explicitly not thermoplastic acrylic or epoxy floor; confirm dosage basis |
| D265R | Polymer block copolymer; DBE; 45% active | Solvent coatings/inks; organic pigments, high-pigment black, thermoplastic acrylic | Compatibility beyond listed resin requires test; confirm dosage basis |
Use D200R for its documented coating jobs
D200R supports dispersion, viscosity reduction, gloss, color intensity, transparency/hiding and organic-bentonite slurry preparation. The page especially recommends architectural, industrial and anti-corrosion coatings.
It does not publish a recommended dosage. Obtain the current TDS and confirm both use level and calculation basis before a batch. Do not infer printing-ink fit from the broader word “solvent-based.”
Use D262R for solvent thermosets
D262R is a 48±3%-solids block-copolymer solution with pigment-affinity groups. It is positioned for carbon-black color spreading and gloss in two-component and thermosetting systems.
The same page explicitly says it is not applicable to thermoplastic acrylic or epoxy-floor coating systems. Preserve those exclusions even if an initial viscosity result looks attractive.
Use D265R for thermoplastic acrylic and inks
D265R is 45% active in dibasic ester and explicitly covers solvent-based coatings and inks, organic-pigment color spreading, high-pigment carbon-black blackness and thermoplastic acrylic resin.
That evidence does not prove compatibility with every nitrocellulose, polyamide, polyurethane, vinyl or mixed binder. Test mill-base and letdown compatibility in the actual resin/solvent package.
Confirm dosage basis before calculation
D262R and D265R publish pigment-class ranges, but their public tables do not clearly label whether percentages are on pigment, total formulation or another reference. Confirm the current TDS. D200R has no public range at all.
Report supplied-product and active addition. Equal product percentage would contribute different polymer solids: approximately 50% for D200R, 48±3% for D262R and 45% for D265R.
Run a controlled grind
- Fix pigment lot, surface treatment, resin, solvent, solids and pigment/binder ratio.
- Add dispersant to the grind vehicle before pigment.
- Hold vessel, media, fill, speed, energy, temperature and sampling time.
- Measure blank plus compact, TDS-supported dosage ladder.
- Let down into the same final resin and age before approval.
Measure dispersion and rheology separately
ASTM D1210 measures fineness of dispersion with a Hegman-type gage. ASTM D2196 characterizes apparent viscosity, shear thinning and thixotropy with a rotational viscometer. A good Hegman reading does not prove stable deflocculation or final application behavior.
Track fineness and viscosity versus time/energy, then color strength or blackness, gloss, transparency/hiding, rub-up, foam/density, sediment, redispersibility and heat/storage drift. Use fixed temperature and rest time.
For carbon black, hold undertone method, tint ratio and drawdown film constant. For chromatic organic pigments, hold standard, white reduction and instrument geometry. A lower viscosity with weaker color development may reflect under-dispersion, flocculation or excessive resin demand rather than better efficiency.
Validate final coating or ink
Apply the letdown at controlled film weight on the production substrate. Measure drying/cure, gloss/haze, color, adhesion, water/chemical resistance, rub/block and recoat. For inks, ASTM D5264 can compare laboratory rub resistance of printed materials.
Age both mill base and finished formulation. A dispersant that passes day-one viscosity can still fail through flocculation, hard settling, color drift or incompatibility after storage.
Inspect aged samples before and after gentle and standardized redispersion. Record whether sediment is soft, hard or irreversible, then repeat fineness, viscosity and color. Visual separation alone cannot distinguish a recoverable condition from loss of dispersion stability.
Common dispersant errors
Using D262R in thermoplastic acrylic
The public page explicitly excludes that resin family.
Assigning a D200R dose by analogy
No public recommended dosage is provided; obtain the current TDS.
Approving the mill base only
Letdown resin and final application can expose compatibility and flocculation failures.
Request a resin-and-pigment match
Send pigment identity/treatment, oil absorption, target loading, resin and solvent, thermoset or thermoplastic status, grind equipment, current dose/basis, fineness, viscosity curve, color/gloss and storage failure. Ask Longchang Chemical for current D200R, D262R and D265R TDS guidance.