Shanghai Daoqin Plastics Co., Ltd.

静 electrical stability and retardant stability: dispersant in material dispersion in important function

in material dispersion process in, stability property is ensure coating material and color quality key/critical factors. electrical stability and retardant stability is types commonly used stability mechanism, dispersant in its in important function, anti material pellets poly and 絮凝, ensure most product uniform property and stability property. will in-depth discussion electrical stability and retardant stability principle and its application.

静 electrical stability principle

in electrical stability in, dispersion solid pellets surface 因离子 selection property 吸附而 belt/tape electrical, make versus liquid in 充满反 electrical 荷. according to Stern模 type, pellets surface formed di electrical 层包含一 吸附层 and expand dispersion 层. pellets versus 互靠近时, di electrical versus function belt/tape electrical 荷间 排斥 or 吸引: belt/tape same electrical pellets 排斥, belt/tape versus electrical 荷时吸引. DLVO理论进一步描述 静 electrical function force and 范德华吸引 force between 关系.

dispersant can significantly effect/influence material pellets surface electrical 荷, through strong/high electrical generate high 排斥势 can, from has made 絮凝. poly electrical understanding type dispersant, poly acid salt and polypropylene (PP) acid salt, tool has stability polymer structure, can long 久吸附于颜 material surface, belt/tape relatively high surface electrical 荷. due to water high dielectric constant, electrical stability mechanism in water property system in performance most 佳. however, in has machine solvent agent in, due to electrical relatively low and di electrical thick degree decrease small, electrical stability 效果不如 water property system obvious.

remove dielectric constant, solvent liquid in concentrated degree and 离子价数也 effect/influence di electrical stability property. 例如, high concentrated degree more 价离子会削 low 甚至破 bad electrical stability mechanism.

belt/tape negative electrical pellets di electrical 层, 吸附层（Stern层） and expand dispersion 层

位 retardant stability principle

different 于依靠 electrical 荷 静 electrical stability, retardant stability through in pellets surface polymer generate 排斥势 can. pellets by solvent agent polymer separation 子包裹, pellets 靠近时, polymer between heavy 叠, 导致渗透 pressure will solvent agent heavy 叠区域, from make pellets versus 互排斥. due to polymer separation in heavy 叠区域 inner type by made, reduce generate outer force, from reinforcement dispersion stability property.

for/regarding achieve has 效 位 retardant stability, additives usually tool key/critical 特征:

1. 颜 material hydrophilic and 基团: additives strong/high force 吸附于颜 material pellets surface.

2. 基 material versus 容链段: in rear from material surface 延伸至 solvent agent in, formed stability polymer 保护层.

polymer 链段良 good solvent agent is achieve stability key/critical. in versus 容 基 material in, polymer 链段会卷曲, from reduce dispersant has property. therefore, in selection dispersant especially attention/notes its and material versus property.

当颜 material pellets versus 接近时, polymer versus 互渗透, from belt/tape retardant stability

静 electrical stability and retardant stability application comparison

• water property system : electrical stability more suitable for water property system, 如乳胶漆 in use poly acid salt and polypropylene (PP) acid salt dispersant. poly acid salt and more 价离子（如钙离子） tool has good combined function, can decrease/reduce for stability property effect/influence.

• non water property system : retardant stability in non water property system in performance more 佳, its 不依赖于 high dielectric constant. through material versus 容链段 function, retardant stability can anti 止絮凝, also can provide material lubricating wet 效果. therefore, 一 含 has material hydrophilic and and material versus 容链段 additives can used as dispersant, can as is wetting agent, 无需额 outer add lubricating wet additives.

结论

静 electrical stability and retardant stability separation in water property and non water property system in important function. electrical stability 依赖于 di electrical electrical 荷 排斥, retardant stability 则依赖 polymer solvent agent and expand 展. selection combined dispersant 时需考虑 system features, material property and concentrated degree and other factors, ensure stability dispersion 效果.