R1800-SH

R1800-SH is the black type among the three R1800 hyperdispersants; the opening positioning in the documentation states "R1800-SH is a hyperdispersant developed on the basis of R1800-S for carbon black plants and black masterbatch manufacturers"; the series origin statement separately records "incorporating a silicon-based product, improving the dispersion performance of R1800-SH in carbon black". The one-line positioning in the official product data is "dedicated to black masterbatch, silicon-enhanced carbon black dispersion", with the mechanism field "chemical dispersion + silicon coupling". (Data source: product handbook / official product data)

Form and physical properties of this product: a silicon and resin ether polymer, a viscous paste; soluble in most organic solvents at room temperature, insoluble in water; the documentation records that it "has physiological inertness and good optical stability, electrical insulation and weather resistance; low freezing point, serving as dispersing internal and external lubrication in many thermosetting and thermoplastic plastics". (Data source: product handbook / official product data)

The official application list is black masterbatch, carbon black wet granulation, carbon black dry granulation — covering the two lines of carbon black plants and masterbatch plants. The function is recorded as "reducing the oil absorption value of carbon black, improving the dispersion performance, flow performance and internal and external lubrication performance of carbon black, and enhancing the coloring rate and compatibility performance". (Data source: product handbook / official product data)

The usage for the two lines is stated separately in the documentation: for wet granulation at carbon black plants, "mix and granulate with other additives and carbon black"; for dry granulation, "add evenly to the carbon black before crushing; only the temperature of crushing can achieve its dispersion effect"; for the masterbatch line, "add simultaneously with other additives into a high-speed mixer and stir; when the temperature reaches about 100℃, add the resin, and after the resin and carbon black are stirred evenly, discharge for granulation". (Data source: product handbook)

• Carbon black-specific conclusion — "treating carbon black with R1800-SH hyperdispersant greatly improves the dispersion performance of the pigment. And it does not change the properties of the pigment; on the contrary, the blackness and processing performance of the carbon black are also improved"; at a dosage of 3% the effect of treating carbon black is the best, and at a temperature above 70℃ the surface treatment effect is the best.
• Blackness data (experimental range 1%–5%) — 1%=120, 2%=124, 3%=130, 4%=128, 5%=125; at every dosage higher than the untreated pigment; the peak is at 3%.
• Hiding power (optical density value) — under standard film thickness 0.02mm, constant PH=6.2, 80℃, at a dosage of 3% the optical density value is at maximum 0.487; further increase causes it to decrease due to "bridging flocculation".
• Dispersibility comparison — carbon black (0.1g) treated with 3% is dispersed relatively uniformly with smaller particles; untreated carbon black is severely agglomerated (observation system PE 99% + carbon black 1%).
• Compatibility and relative performance — "compatibility with all rubbers and plastics is very good, lubrication performance is 28 times that of wax, dispersion performance is 122 times that of wax"; read literally as a per-item comparison of the two items "lubrication / dispersion", not an overall performance multiple.
• Hue and appearance — a blue paste, with a faint lard odor; "the hue deepens as the temperature changes"; it does not affect the color when used in a product.
• Internal and external lubrication — serves as dispersing internal and external lubrication in many thermosetting and thermoplastic plastics; this step, together with the improvement of the carbon black oil absorption value and flow performance, is a function recorded in the documentation.

The molecule of this product has a structure divided into two parts: an anchoring group (-COOH) and a solvating chain (dispersion). The anchoring group "adsorbs tightly to the pigment surface through ionic bonds, hydrogen bonds and van der Waals forces"; the solvating chain determines the stability of the dispersed pigment in the medium. (Data source: product handbook / official product data)

The temperature behavior has a clear boundary: "below 80℃ the coating layer does not melt; above 80℃ it begins to melt and converts into an ionic coupling agent, improving the compatibility of carbon black with the resin". This is the direct basis for the carbon black surface treatment process temperature (constant 80℃). (Data source: product handbook)

In carbon black paste: charges accumulate on the particle surface and combine with the anchoring group (-COOH) to form a protective layer; the steric barrier effect of the solvating chain (hydrocarbon chain) achieves stable dispersion — when particles approach each other they are repelled by the repulsion of the adsorbed layer. (Data source: product handbook)

The general dispersion process also applies: three parts — wetting, refinement (dispersion), and stabilization after refinement (encapsulation); pigment surface treatment is the process of stabilization after refinement. For this type, the formation of the encapsulation simultaneously reduces the carbon black oil absorption value, thereby improving flow and processing performance. (Data source: product handbook)

1. Anchoring adsorption — protective layer formationThe anchoring group -COOH adsorbs to the carbon black particle surface via ionic bonds, hydrogen bonds and van der Waals forces; the charges accumulated on the particle surface combine with the anchoring group to form a firm protective layer.
2. 80℃ phase transition — the coating layer melts and converts into an ionic coupling agentBelow 80℃ the coating layer does not melt; above 80℃ it begins to melt and converts into an ionic coupling agent, improving the compatibility of carbon black with the resin. The process temperature of the carbon black-specific experiment is set at 80℃.
3. Steric barrier — stable dispersionThe solvating chain (hydrocarbon chain) extends to form a spatial steric barrier; when particles approach each other they repel and bounce apart; the dispersion stability and blackness of the carbon black benefit from this.
4. Two process lines — carbon black plants and masterbatch plantsCarbon black plants: during wet granulation, mix and granulate with other additives and carbon black; for dry granulation, add evenly before crushing, and the dispersion effect is achieved through the crushing temperature. Masterbatch plants: enter the high-speed mixer together with other additives, add the resin at about 100℃, and granulate after mixing evenly.

The table below summarizes the physicochemical indices and solubility records of R1800-SH as documented in the product handbook and official product data. The values in the table are as recorded; before bulk use, small-scale trials are recommended in combination with your own carbon black grade and formulation.

Notes: (1) The recorded density of 0.860 g/cm³ differs considerably from the same series (both S / SK are 1.190 g/cm³); the two sources agree, and it cannot be determined from the existing data whether this is a measured value or an entry deviation, so this page presents the original value with a note; (2) "lubrication 28× / dispersion 122×" is an item-by-item comparison of the two items lubrication and dispersion (series-level record), not an overall performance multiple; (3) The carbon black specific data (optical density value, blackness series) come from dedicated experiments for this grade, with a test range of dosage 1%–5% (constant PH=6.2, 80℃). (Data source: product handbook / official product data)

The dosage of this grade likewise has two levels: the summary record (1%) and the dedicated experimental conclusion (best carbon black treatment effect at 3%, test range 1%–5%). The two accounts are preserved side by side, with no choice made between them; select the one to use according to your objective (process condition confirmation / performance optimization).

Dosage principle (series-level record): 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; the dedicated conclusion for this grade is "best carbon black treatment effect at a dosage of 3%, and best surface treatment effect at temperatures above 70℃". In the reference formulation of this grade, the paste hyperdispersant and the polyethylene wax appear in the same formulation — the two additives are used in combination, not as substitutes for each other.

To be verified: (1) Two dosage accounts coexist — the summary records "dosage 1%", while the experiments and conclusion record "best carbon black treatment effect at 3%"; the correspondence between the objects and the judgment criteria of the two is not indicated, so this page presents them side by side as in the original. (2) Carbon black grade: the experimental raw material list records ZY-1, while the formulation line records DK2028P; the two are inconsistent, and this page retains them as in the source. (3) The above are all recorded values; for actual production, please conduct small-scale trials in combination with your own powder, equipment and formulation.

The official application list is black masterbatch, carbon black wet granulation and carbon black dry granulation; the product handbook additionally records the specific usage and dedicated experiments of two production lines. Item by item as follows:

Black masterbatch

One of the main uses of this grade: added together with other additives into a high-speed mixer and stirred; when the temperature reaches about 100℃, the resin is added, and after the resin and carbon black are stirred uniformly, the mixture is discharged for granulation.

Carbon black wet granulation

During granulation, mixed and granulated with other additives and carbon black (the carbon black plant usage as recorded).

Carbon black dry granulation

Evenly added to the carbon black before crushing; only the temperature reached during crushing can achieve its dispersion effect.

Dispersing internal/external lubrication

The data record this product as "acting as a dispersing internal/external lubricant in many thermosetting and thermoplastic plastics"; another function item records "reduces the oil absorption value of carbon black, improves the dispersion performance, flow performance and internal/external lubrication performance of carbon black, and enhances the coloring rate and compatibility performance".

Compatibility range

The R1800 series "has very good compatibility with all rubbers and plastics" (series description record).

Selection and synergy

The data give selection advice according to pigment fineness and oil absorption value; recommended grades include, for example, R1800-SK, R1800-SH, R1618, R900A, etc.; the finer the powder, the higher the oil absorption value and the larger the specific surface area, the higher the dispersant amount.

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

The three R1800 types are all paste-form hyperdispersants, divided by color line (S color / SK white / SH black); the differences do not lie in the routine physicochemical entries, but in the application lists, dedicated experiments, and temperature behavior. The comparison is as follows:

Reading notes: (1) Among the three types, the routine physicochemical entries of S and SK are the same set, while SH's amine value (≦8), acid value (≦6), flash point (287℃), viscosity (1000-4000 mPa·s), and density (0.860 g/cm³, annotated) are recorded independently; (2) "lubrication 28 times / dispersion 122 times" is recorded on this type's page (a series-level record) and is cited only as an item-by-item comparison of lubrication / dispersion; (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 dosage basis. The following points are taken one by one from the source records.

The data on this page come from two types of source materials and are traceable item by item:

• Product handbook: the full section of the R1800-SH entry (title / overview / main components / physicochemical properties / surface treatment and masterbatch applications / theoretical analysis / experimental section / results and discussion / conclusion / addition level / packaging / storage); the comparison paragraphs for R1800-S and R1800-SK; the series introduction and product catalog paragraphs.
• Official product data: all fields of R1800-SH (name, category, positioning, description, mechanism, applications, physicochemical parameters, main components, functional description, recommended dosage); the series entry (representative model list, series description).

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

• Difference between the density 0.860 g/cm³ and the sibling value 1.190 g/cm³: the two sources are consistent, and it cannot be determined whether this is a measured value or an entry error.
• Two dosage bases coexist (overview 1% / experimental optimum 3%): the correspondence between the objects and judgment criteria is not annotated.
• Carbon black grade: the raw material list records ZY-1, while the formulation line records DK2028P; the two are inconsistent.
• Compliance certification statements, shelf life, and safety handling data (MSDS level): not recorded in the available materials.