R1800-S

R1800-S is the base type and the series origin among the three R1800 hyperdispersant types. The documentation records that it is "copolymerized from polyolefin ether multimers under high temperature and high pressure, mainly used in rubber and plastics color masterbatch and oil-based paints and inks, etc."; the synthesis method is production from a coating agent and a dispersant in precise proportions under high-temperature and high-pressure conditions, and it is a "polymeric multifunctional wetting and coating-type dispersing aid". The one-sentence positioning in the official product data is "dedicated to color masterbatch, chemical dispersion breaks up agglomeration", with the mechanism field "chemical dispersion". (Data source: product handbook / official product data)

The documentation for the other two types both states "on the basis of R1800-S": the SK type incorporates ester functional groups, improving yellowing resistance and weather resistance in plastic products, and is mainly used in rubber and plastics white masterbatch; the SH type incorporates silicon-based products, improving dispersion performance in carbon black. The three types are divided by color — S corresponds to color and general purpose, SK to white, and SH to black; the mechanism, form and usage rules common to all three types are all written under the S type. (Data source: product handbook)

This product family addresses problems in the field: the finer the powder, the more easily it agglomerates together, and without a good dispersant there is no way to disperse it; after the filler dosage increases, the powder in the melt is difficult to disperse and gel spots are produced. Different masterbatch manufacturers differ in equipment, process, raw materials, lubrication systems and cost ranges, and this is where the multiple models and the dosage table graded by mesh come from. (Data source: product handbook)

The documentation records that the main functions of this product are: "dispersion and encapsulation, lubrication and mold release, toughening and brightening, usable as a slip and anti-blocking agent, able to replace maleic anhydride grafting, able to adjust product flow rate, able to improve product impact strength and tensile strength, etc.". It is additionally recorded at the series level: processing aids with good dispersion and also good lubrication all tend to improve the tensile strength, toughness, surface finish and Vicat softening point of plastic products. (Data source: product handbook / official product data)

• Lower pigment cost — can increase the tinting strength of organic pigments by more than 25%, while also improving the hiding power of inorganic pigments; the documentation records that "even if the pigment dosage is reduced by 10%~20%, the coloring effect will not be weakened".
• Improve production efficiency — with conventional formulations, the dispersion effect often decreases when the screw speed is increased; using this product can raise output per unit time while the dispersion effect does not decrease, and "sometimes even increases substantially".
• Improve product quality — the documentation records that it "eliminates spots and stains and shrinkage cavities, improves the surface condition and raises the finish of the articles; eliminates surface defects and improves impact strength; increases brightness and vividness".
• Lower processing cost — product quality is stable and the "rework" rate is low.
• Improve processing conditions — in premixing, reduces the "crowding" degree of pigments and powders as well as pigment dust.
• Inert — "does not react with other additives"; when used correctly it does not change the original properties of the resin (melt index, viscosity, melting point/softening point, stress/strain, hardness/softness, light fastness, impact resistance, aging resistance, etc.).
• Related to insulation performance — when treating kaolin, "adding 2 per thousand" can improve insulation performance (for comparison with the graded dosage, see the "to be verified" note in Section 4).

The molecular structure of this product is divided into two parts: one part is the anchoring group, and the other is the solvating chain. Its main function is to form a protective layer (coating film) of a certain thickness on the surface of pigments and various powders. When pigment and powder particles adsorbed with the hyperdispersant approach each other, due to the steric hindrance of the protective layer (coating film), it is difficult for the particles to form tight agglomerates or flocculates, so that the pigment and powder particles are easily dispersed and have good dispersion stability in the medium. (Data source: product handbook / official product data)

The documentation divides the working mode of this product into two types: the mode of action during the surface treatment of pigments and powders, and the mode of action during the dispersion of pigments and powders. (Data source: product handbook)

1. Surface treatment process — adsorption and film formation, purification of active sitesOnce pigment and powder particles are formed (primary particles), the specially designed R1800-S hyperdispersant rapidly adsorbs onto the particle surfaces to form a protective layer (coating film), filling up the lattice defects of the particles and purifying the active sites on the surface that are prone to agglomeration, thereby effectively preventing further agglomeration of the particles. Even if the particles agglomerate during filtration, compaction and drying, due to the isolating effect of this product, the agglomerated state is very loose (the particles mainly contact each other at points and edges), and the resulting pigments and powders are particularly easy to disperse in subsequent applications.
2. Dispersion process — reducing interfacial tension, stabilization by steric barrierThe anchoring groups adsorb onto the surface of the pigments and powders, and the solvating chains dissolve rapidly in the dispersion medium and have good compatibility with it, thus greatly reducing the interfacial tension between the pigment and powder particles and the dispersion medium, so that the powder is quickly wetted by the medium during dispersion; at the same time, due to the steric hindrance of the protective layer, when the particles approach each other it is difficult for them to come further together and agglomerate, thus achieving good dispersion stability.
3. General dispersion process — wetting, comminution, stabilization (coating film)The documentation divides the pigment dispersion process into three parts: wetting, comminution (dispersion), and stabilization after comminution (coating film). Pigment surface treatment is the process of stabilizing pigments after comminution — depositing and coating monomolecular or multimolecular substances on the surface of pigment particles, including surfactants, modifiers, derivatives of the pigment itself, etc. The documentation additionally records: because there is a coating film on the powder surface, both the oil absorption value and the friction coefficient are greatly reduced; generally, the finer the powder fineness, the higher the surface gloss and saturation will be.
4. Temperature behavior — wetting and coating on heating, setting on coolingThe documentation records that "at temperatures above 80 degrees, R1800-S can quickly wet into the powder to achieve dispersion and coating effects, and after cooling the coating agent will solidify". This also explains the two usage prerequisites of this product: it must be used with heating, and it is "prohibited from use in cold-processed powder" (without heating, this product cannot be used, because it cannot fully exert the dispersion and coating effect).

The table below summarizes the main components, physicochemical indicators, and compatibility records of R1800-S as documented in the product handbook and official product data. The values in the table are as recorded in the source materials; before bulk use, it is recommended to carry out small-scale tests with your own powder grades and formulations.

Note: the entry for this grade does not list pH value or "solubility" (organic solvent) items; under main components, the overview separately describes it as "polyolefin ether polymer," which belongs to the same record. Statements in the entries for the related SK / SH grades such as "hue darkens with temperature" and "melting transition boundary of the coating layer" do not represent this grade and have not been carried over. (Data source: product handbook / official product data)

The source materials document dosage at several levels: fillers are graded by mesh, pigments are adjusted by formulation, and there are also the "addition in the final plastic product" and two specific scenario values. When using it, first distinguish the source and the denominator — the table below gives the conditions and notes row by row.

Dosage principle: "the amount added is determined according to the oil absorption value and particle size of different powders" — the finer the powder, the higher the oil absorption value and the larger the specific surface area, the higher the amount of dispersant to be added.

To be verified: (1) The kaolin dosage appears in two parallel statements in the source — "when treating kaolin, adding 2 parts per thousand (0.2%) can improve insulation performance" and the grading table's kaolin 0.3% (800 mesh)–0.8% (3000 mesh); the reference objects of the two statements (mesh, whether calcined, target performance) are not annotated with a correspondence, and this page presents them side by side as-is without making a choice. (2) All of the above are values as recorded in the source materials; for actual production, please conduct small-scale tests with your own powder, equipment, and formulation to confirm.

The official application list is color masterbatch, apparel coatings, powder coatings, oil-based coatings, and oil-based inks; the product handbook additionally records uses such as filler systems, PVC stabilizer systems, and calcined kaolin. Item by item as follows:

Color masterbatch

First on the official application list; the official positioning is "dedicated to color masterbatch, chemical dispersion breaks up agglomerates."

Apparel coatings / powder coatings / oil-based coatings / oil-based inks

Listed in the official application list; among them, powder coatings and oil-based coatings overlap with the list for the related R1800-SK grade, so small-scale tests are recommended for confirmation according to the coloring system.

Filler systems (calcium carbonate, talc, kaolin) and filled masterbatch

Comes with a dosage table graded by mesh (see Section 4); as the filler dosage increases, the powder tends to form gel spots.

PVC plastics stabilizer system

When producing PVC composite stabilizers (lead salt, lead-barium, barium-zinc composites, etc.), adding 0.5% of this product makes the composite stabilizer more compatible with PVC and more evenly dispersed in the PVC, and provides internal and external lubricating and mold-release action.

Calcined kaolin and insulation scenarios

When treating calcined kaolin, adding this product can improve the dispersion of the kaolin and can improve the insulation performance of the kaolin used in cable compounds.

Compatibility range

The R1800 series has very good compatibility with all rubbers and plastics (as recorded in the series description).

Grade selection and synergy

The source gives grade selection recommendations based on pigment fineness and oil absorption value; examples of recommended grades include R1800-SK, R1800-SH, R1618, R900A, etc.

Field issues & application examples (as recorded in the source material)

All three R1800 grades are paste-form hyperdispersants, divided by color line; the differences are not reflected in the standard physicochemical entries but in the application lists, dedicated experiments, and phase-transition behavior. Comparison as follows:

Reading notes: (1) Among the standard physicochemical entries of the three grades, S and SK are the same group; (2) SK's "lubrication against wax 26 times, dispersion 113 times" and "excellent compatibility with all rubbers and plastics" are series-level records of the R1800 series (they also appear under the SK entry in the handbook), and this page does not carry them over under S's name; (3) The values in the comparison table are as recorded in the source materials. (Data source: product handbook / official product data)

This product is a paste. Its performance is directly related to temperature, mixing order, and the basis for dosage. The following points are taken item by item from the recorded data.

The data on this page comes from two types of sources, each item traceable:

• Product handbook: the full R1800-S entry (overview / main components / physicochemical properties / application scope / use effects / advantages / dosage / main functions / identification methods / prohibited items / eight application examples / addition content / packaging / storage); the R1800-SK and R1800-SH comparison section; the series overview section (product introduction, synergistic effects, masterbatch background); the color masterbatch selection section.
• Official product data: all fields of R1800-S (name, category, positioning, description, mechanism, applications, physicochemical parameters, main components, function description, recommended dosage); the R1800-SK / R1800-SH comparison entries; the series entry (representative grades, series description).

Not covered by the source material (not written on this page — to be added later)

• Compliance certification statements (such as RoHS, REACH, etc.), shelf life, and safe-handling data (MSDS level): not recorded in the available data.
• "Solubility" (organic solvent) entry: not listed for this grade.
• Two statements of kaolin dosage are juxtaposed (0.2% in the advantages entry and 0.3%–0.8% in the tier table), and the reference objects are not annotated with a corresponding relationship.