First, mechanism: 1. by the mechanical way, disperses the pigment in the medium the most basic goal is own oil condensation particle dispersion which dry causes in the pigment manufacture process process.When pellet degree of fineness changes small, its exposed surface area increased has promoted the pigment optical quality, for example: Coloring performance, gloss, brightness, hiding power or transparency. 2. in the common dispersing agent attrition system, for example the printing ink, the coating, the resin is one of in formula components, but the resin and the dispersing agent in the pigment can the mutual competition.Dispersing agent in pigment surface adsorption ability, also can receive the resin the influence, the resin and the dispersing agent can the mutual competition adsorption in the pigment surface opportunity.Not only but between the dispersing agent and the resin difference lies in the dispersing agent adsorption pigment surface fastness, the dispersing agent has the greatly strengthened adsorptive attraction to the pigment, and has the very good affinity to the solvent.The resin in the pigment surface, only plays actually the moist role, it not for a long time moistened in the pigment surface, the time has been long, the resin slowly will leave the pigment surface to cause the flocculation, for all that, but the resin existence has hindered the dispersing agent in the pigment surface anchor.Therefore, when choice resin, takes an examination rate the resin to bring becomes the membrane function, but does not need to choose other very good moist or the attrition resin, in addition, but also must consider in the attrition parent metal the resin content enough or not maintenance formula stability. 3. dispersing agent in attrition parent metal uses, compares with the traditional attrition parent metal, its formula adjustment most essential is the resin solution density.In the traditional attrition medium the resin density is high, the pigment may load the quantity to be few.Although reduces the resin density to be possible to cause dispersion medium itself the viscosity to reduce, the pigment packing quantity may enhance, but such dispersion system is unstable, cannot use in producing actually.If uses dispersing agent, dispersion system under low resin density then stable, thus makes in the attrition parent metal the pigment packing quantity to enhance greatly, the dispersing agent solvation chain the spatial barrier which produces in the medium, reduced between the granule suction, reduced the attrition viscosity greatly, this also is one of reasons which the pigment packing quantity can enhance.Under the dispersing agent function, the pigment packing quantity enhances the scope different to have along with the dispersion system leaves, but in the alignment procedure, should maintain the attrition parent metal to have the moderate viscosity. 4. pigment stability theory pigment dispersing medium stability, basically has 2 kind of mechanisms: The static electricity stability and the position full stability, these 2 kind of mechanisms all must the molecular adsorption pigment surface. Second, application method and amount used: The dispersing agent amount used needs to act according to the pigment which disperses to decide, its best amount used forms the compact single molecular adsorbed layer take the dispersing agent in the pigment surface as the standard.The amount used too are few, the dispersing agent cannot unfold its merit, excessively many amounts used also can affect the attrition the stability.Because because this mainly the too crowded dispersing agent cannot fully extend completely in the pigment surface the dispersing agent solvation chain, moreover the massive dissociation dispersing agent can have the negative influence to the paint film.In the actual operation process may according to the theory rule computation dispersing agent approximate amount used, then fluctuate first take this as the center point about, observation performance index appropriate to one's station medicinal powder amount used and so on dispersion system viscosity, paint film gloss and tinting strength change relations, when dispersing agent amount used moderate, the dispersion system viscosity has at the same time the obvious minimum the paint film gloss and the tinting strength has the maximum value. Third, the operational effectiveness analyzes: Changes the pigment the disperser, also said, evener finely ground particles narrow pellet distribution map (or reduction attrition time).General, the small pellet is easier to condense in creates the flocculation together, however, because dispersing agent opens the pigment pellet, reduces the pigment pellet between cohesive force.Its disperser effect compared the general dispersible function to improve the pigment dispersing medium stability greatly.Between the pellet cohesive force also is decides the high pigment system (abrasive or high solid share coating) one of viscosity factors.The dispersing agent separates the pigment pellet between the maintenance pellet certain distance, reduces the internal stress, simultaneously greatly has also weakened the viscosity question which the pigment creates, therefore obtains coordinates the better changing performance or the higher pigment percentage.Moreover, in the general attrition system, the viscosity change belongs to shearthiningpseudoplastic (thixotropy) to the pigment good wettability 1. enhancement coloration intensity, enhances the gloss, falls the ground fog shade, enhances the transparency or the hiding power Pigment pellet degree of fineness mean value depression, can help the enhancement coloration intensity.Between the highly concentrated pigment filling quantity increase granule strikes against the number of times, thus enhanced the pigment dispersible efficiency.However, will enhance the pigment filling quantity to be able to increase the viscosity, but weakened the attrition function as well as some helps disperses the steel ball or the tile ball dispersible function.The use dispersing agent can help the high filling quantity to be dispersible, faster dispersible pellet; Simultaneously also prevents the dispersion system the viscosity in the attrition process enhancement, finally entrusts with the dispersing medium colloid stability, guarantees between the pellet not to be able to have the flocculation, simultaneously displays the pigment inherent coloration intensity. The general high gloss coating pigment pellet dispersion degree does not surpass 5 microns.But the high grade high gloss coating pigment particle dispersion granularity request is 3 microns.The majority of printing ink contain the pigment pellet degree of fineness not to surpass
1 micron.Big pellet granule exists which in the coating, possibly produces in the imperfect disperser and the flocculation, also perhaps when configuration final formula produces “the granule presses to gather the flocculation” the phenomenon to create.Does the dispersing medium granule distribution direct influence coating radiance, which not entire coarse particles in the coating crush brings “gloomily” to the dry film the performance.Can control the dispersing medium using the dispersing agent the distribution, achieves the best radiance. In the coating pigment floats the color, sees with a blur and so on the phenomena in the relative density, the particle size as well as the pigment granule dispersing medium condition has the close relation.But in the pigment granule dispersed state direct influence coating pigment floats the color, sees with a blur and so on the phenomena.Although the dispersing agent does not affect the pigment the relative density, but it can improve the dispersed state, stable dispersing medium, thus reduces the flocculation the possibility, this guarded against the flocculation phenomenon also to improve the coating in the different construction duplication.
2. can avoid in the formula using the attrition resin (wettability good resin) to provide the moist pigment function Between 3. reduction attrition time impediment pigment mutual attraction
4. strengthens the anti-flocculation performance
5. reduces the attrition parent metal the viscosity to enhance the pigment the packing quantity
6. reduces the pigment to the coating viscosity influence, reduces the organic volatile matter
7. enhancements reduces the resin content, increases the intense color thick liquid the storage and the transportation stability.