快速回答： when a solvent-based primer carries too much grind viscosity, the best first move is usually not to add more thinner blindly. The better first step is to separate what is making the primer heavy. If the system is a primer package loaded with carbon black, bentonite, matting powder, titanium dioxide, and filler pigments, CHLUMICRYL® DP-D241R deserves early review. If the real pressure is organic-bentonite slurry preparation plus broader architectural, industrial, or anti-corrosion coating work, CHLUMICRYL® DP-D200R becomes the cleaner first route. If the primer behaves more like a high-pigment, matte-rich grind where fast fineness reduction and 储存稳定性 matter, CHLUMICRYL® DP-D2641R should move up.
That is the useful split. This page is not another broad dispersant overview. It is a narrower buyer page for teams trying to fix thick solvent-based primer grinds without collapsing back into generic additive language.
Why this page deserves its own place in the CHLUMICRYL® cluster
Longchang already has live pages on dispersants for pigmented coatings and inks, organic-bentonite slurry dispersant selection, matting-powder dispersant selection， 和 floating color and flowering control. Those pages answer different buyer questions.
This page answers a more specific one: which CHLUMICRYL® dispersant should be screened first when the solvent-based primer is simply too viscous to grind, let down, or apply efficiently? That is a real B2B screening problem, especially in primers carrying high pigment and filler burden.
General industry guidance also treats dispersants as tools that improve particle wetting, reduce flocculation, and help viscosity control in pigment and filler systems. That broader framing is useful here, but the product-level claims below stay tied to Longchang-supported product pages.
What usually causes viscosity pressure in solvent-based primers
In practice, a primer grind often becomes difficult when several burdens arrive together:
- Carbon black and organic bentonite driving up structure and grind resistance
- Matting powder or filler pigments adding volume and interaction pressure
- Titanium dioxide and inorganic pigments increasing the total solid loading
- Multi-pigment packages that need both wetting and stability, not only dilution
- Storage expectations that punish any dispersant route that looks acceptable only on day one
That is why a thick primer should not be treated as a one-word “viscosity problem”. The better question is whether the system is mainly a primer-package viscosity problem, an organic-bentonite slurry problem或者 high-pigment efficiency and storage-stability problem.
Quick comparison table: which primer viscosity route should move first?
| Buyer problem | 最佳首选路线 | 为什么它属于早期阶段 |
|---|---|---|
| Primer system with carbon black, bentonite, matting powder, TiO2, and filler-side viscosity pressure | DP-D241R | Longchang directly supports it for primer systems carrying those materials and highlights excellent viscosity reduction plus thinner reduction support |
| Need to prepare organic-bentonite slurries while also keeping a broader industrial, architectural, or anti-corrosion primer path open | DP-D200R | Longchang directly supports organic-bentonite slurry preparation, viscosity reduction, and recommendation for architectural, industrial, and anti-corrosion coating systems |
| High-pigment, matte-rich primer or related grind needing fast fineness reduction, no stable foam, and stronger storage stability | DP-D2641R | Longchang directly supports high-pigment carbon black, organic pigment, and matte-powder dispersion with fast fineness reduction and excellent storage stability |
When DP-D241R is the stronger first screen
CHLUMICRYL® DP-D241R should move up first when the solvent-based primer is thick because of a crowded primer pigment package, not because of one isolated pigment. Longchang directly supports DP-D241R for primer systems containing 炭黑、膨润土、消光粉、轻质碳酸钙、超细磷酸锌、硫酸钡、云母粉、二氧化钛和滑石粉. The same page says it has 优异的粘度降低能力, can reduce the use of thinner, gives good wetting and dispersion of pigments, improves organic-pigment coloring strength, and can reduce 漂浮的色彩和花朵 在多颜料体系中。
That makes DP-D241R the clearest first route when:
- the job is explicitly a primer, not a generic solvent coating
- the viscosity pressure comes from carbon black plus bentonite or filler pigments
- the buyer wants a supported route that can lower thinner demand instead of only masking the problem
- the multi-pigment package also creates 浮色 或者 开花 risk
Its dosage structure is also worth respecting during the first trial: Longchang shows 1% to 10% for inorganic pigments, 20% to 40% for organic pigments, and 30% to 100% for carbon black. This is not a product to treat with a copy-paste addition level across every primer grind.
When DP-D200R is the better first route
CHLUMICRYL® DP-D200R becomes the cleaner first choice when the project still needs strong viscosity reduction, but the more specific commercial pressure is organic-bentonite slurry preparation plus broader solvent-based coating utility. Longchang supports DP-D200R with excellent dispersion efficiency, viscosity reduction, 高光泽, enhanced color intensity, increased transparency and hiding power, and says it is 非常适合用于制备有机膨润土浆料. The same page also says it is 特别推荐用于建筑涂料、工业涂料和防腐涂料系统。.
That pushes DP-D200R forward when:
- the primer work sits closer to anti-corrosion 或者 industrial coating screening
- the team needs one route that helps both slurry preparation and broader primer dispersion efficiency
- the buyer wants a supported path that balances viscosity reduction with appearance-related gains such as gloss or color intensity
- the grind plan starts from mill-base organization, since Longchang says the dispersant should be added to the grinding material and stirred before adding pigment
In short, DP-D200R is the stronger first screen when the primer problem is adjacent to slurry preparation and broader industrial-coating use, not only to a crowded carbon-black primer package.
When DP-D2641R should move ahead
CHLUMICRYL® DP-D2641R deserves earlier review when the primer grind is behaving more like a high-pigment concentrate or a matte-rich, efficiency-sensitive mill base. Longchang supports DP-D2641R for dispersing high-pigment carbon black, organic pigments, and matte powder， 和 excellent dispersion efficiency, viscosity reduction ability, 没有稳定的泡沫， 和 优异的储存稳定性. The same page also notes fast fineness reduction in a solvent-free epoxy-floor compound color paint system.
That makes DP-D2641R more compelling when:
- the thick primer is also a high-pigment grind-efficiency problem
- the team cannot afford a route that looks good during grinding but destabilizes later in storage
- matte powder is part of the viscosity picture and the buyer needs a more storage-stable route than a purely broad dispersant
- the lab wants a supported path with fast fineness reduction instead of only lower cup viscosity
DP-D2641R is not the default for every primer, but it is a strong first route when the heavy primer behaves like a high-load dispersion project rather than only a bentonite or thinner-consumption problem.
买家在索取样品前应该如何选择？
1. Start with the real source of viscosity build
If the burden is mainly a primer package loaded with carbon black, bentonite, titanium dioxide, and fillers, start with DP-D241R. If the burden starts with organic-bentonite slurry preparation and broad industrial-primer use, start with DP-D200R. If the burden is really high-pigment grind efficiency plus storage stability, start with DP-D2641R.
2. Do not treat thinner as the only answer
Longchang explicitly supports thinner-reduction logic on DP-D241R. That matters because extra solvent can lower viscosity temporarily while leaving the actual dispersion problem unsolved.
3. Keep storage performance visible
Some primer dispersants help the grind move faster on day one but do not hold the same practical stability later. If storage or shipment matters, DP-D2641R deserves a deliberate check because Longchang directly supports excellent storage stability.
4. Separate primer-package problems from appearance-only problems
If the complaint is really about color separation, revisit floating color and flowering control. If the complaint is really about matting-powder selection, revisit matting-powder dispersant selection. This page is for the earlier question of how to get a thick solvent-based primer under control.
5. Use the first sample round as a decision round
For many buyers, the cleanest trial plan is one route for primer-package viscosity reduction其中一条路线 organic-bentonite-led industrial primers以及一条路线 high-pigment storage-stable grinding. That usually teaches more than testing several near-neighbor dispersants without a clear hypothesis.
本页推荐的龙昌路线
- 集群概览： CHLUMICRYL® 涂层和油墨添加剂
- 更全面的分散剂指南： 如何选择颜料涂料和油墨的分散剂
- Organic-bentonite route: How to Choose a Dispersant for Organic Bentonite Slurry in Solvent-Based Coatings
- Matting-powder route: 如何选择溶剂型涂料中消光粉的分散剂
- Product page, primer route: CHLUMICRYL® DP-D241R
- Product page, slurry and industrial route: CHLUMICRYL® DP-D200R
- Product page, high-pigment route: CHLUMICRYL® DP-D2641R
常见问题
Which CHLUMICRYL® dispersant should I screen first for a thick primer carrying carbon black, bentonite, and filler pigments?
Usually DP-D241R, because Longchang directly supports it for primer systems containing carbon black, bentonite, matting powder, titanium dioxide, and filler pigments, with strong viscosity-reduction logic.
When is DP-D200R a better first route than DP-D241R?
DP-D200R becomes the better first route when the project leans more on organic-bentonite slurry preparation and broader architectural, industrial, or anti-corrosion coating use instead of a crowded carbon-black primer package alone.
Why would a buyer move DP-D2641R ahead of the other two?
Because Longchang directly supports DP-D2641R for high-pigment carbon black, organic pigments, and matte powder with fast fineness reduction, no stable foam, and excellent storage stability. That is valuable when the thick primer is also a high-load dispersion and storage problem.
Is this page the same as the existing organic-bentonite or matting-powder pages?
No. Those pages are narrower branch pages. This page is specifically about the buyer problem of high viscosity in solvent-based primers and how to choose the first dispersant route from that starting point.
What should the first lab comparison look like?
Use one route for primer-package viscosity reduction, one for organic-bentonite-led industrial or anti-corrosion primer work, and one for high-pigment storage-stable grinding. That makes the first round a real decision screen instead of a random additive trial.
Need a faster primer-grind shortlist?
If your solvent-based primer is still too heavy after ordinary letdown adjustments, do not assume every dispersant route is solving the same problem. Start by separating primer-package viscosity pressure, organic-bentonite slurry handling， 和 high-pigment storage-stable grinding. That usually shows much faster whether DP-D241R, DP-D200R, or DP-D2641R belongs at the front of the sample plan.