Shanghai Daoqin Plastics Co., Ltd.

how to 确定颜 material and filler most dispersant use amount

formulation design can use multiple different dispersant chemical formed separation, has dispersant in water property or non water property system in dispersion 特定颜 material need ratio other dispersant good more, due to full cover/cap material or filler surface dispersant use amount same, will introduction how to optimization combined dispersant use amount. this 取决于 selection dispersant, and surface 积, surface can, absorption force and other formulation features 变化. full cover/cap pellets surface important, is this will optimization material stability property and property can.

in water property material in, dispersant most use amount comparison easy 确定, it 依赖于当颜 material surface full by cover/cap viscosity to most low this 一事实. commonly used testing methods lower:

methods A - 需 dispersant 近似测 amount methods

1, made material 浆--颜 material content need high, in has dispersant lower mixed combined rear to 浆状颜 material. usually lower, has machine material add amount is 30wt.%, machine material add amount is 55wt.%.

use solvent understanding agent （ or type dispersant ） dispersion time is 30 separation 钟.

2, add dispersant and viscosity - will dispersant separation add 入搅拌 good material in, add and mixed combined rear, use Brookfield viscosity or sheet/plate system in low speed rate lower amount viscosity.

然 rear add dispersant, viscosity to most small value, can to strip/profile type viscosity 曲线（图1）, 曲线1 is type 无 machine material 传统 wetting agent and dispersant, poly acid salt and poly acid. 曲线2 usually in other type type polymer dispersant in.

图1

in material in add polymer dispersant rear, viscosity drop to most low, different type type dispersant generate different 曲线, most dispersant use amount is to viscosity most small value 点.

generally 说, this type of methods dispersant use amount less. this is is due to dispersion process in add dispersant amount less, therefore method to most abrasion degree. dispersion rear 立即开始 heavy new poly 集, has dispersant stability material pellets, in dispersion and amount viscosity between 会发生变化. if will as steps is below/following methods, can this 一点.

methods B - 确定 stability material 浆 需 most dispersant use amount

1, use 玻璃球 in mixed combined device in dispersion material 浆.

2, add dispersant, 直至达 to most low viscosity, dispersion 约10 separation 钟. in many lower, viscosity again upper rise, therefore need toward material in add more more dispersant, process 一直持续 to viscosity obvious reduce is 止.

for/regarding polymer dispersant 而言, viscosity reduce 曲线如图2 示.
 

图 2

当 dispersant 不足时, in remove force rear 会立即开始团 poly, use methods B（而不 is methods A） will has 助于您确定 需 positive dispersant add amount.

每次添 add dispersant rear, viscosity value drop most low, dispersion time long rear, viscosity value also rise, can reduce viscosity, 直至观察 to viscosity again increase. through methods obtain dispersant use amount 并不代 table/sheet obtain degree, anti again poly stability property and material surface dispersant stability property.

testing dispersion quality

has many testing methods can used for dispersion quality different 方面. in lower methods in, will introduction how to made testing dispersion 体:

1, dispersant demand amount, according to upper methods B计算 需 dispersant use amount.

2, made material 浆, use positive amount dispersant made material 浆. in addition in made color 浆时, dispersant use amount need ratio most use amount less 10% and more 10%, this has 助于证实 most use amount is according to methods B确定.

dispersion in mixed combined device or abrasion machine upper 进行, comparison sample 时应始终 use same equipment and steps. material and 玻璃球 ratio/proportion =1:1.5. dispersion time =40-60 separation 钟. add relatively high concentrated degree property defoamer （0.5-1.0%）, can ensure bubbles dry rear amount. （ table/sheet 1）列出 浆 material formed separation, attention/notes certain type type dispersant can can need adjustment PH value.

table/sheet 1. is rear dispersion quality testing made material formed separation.

研 abrasion rear, use made good for transparent 漆进行 color, rear coating in dry 净 玻璃 sheet/plate upper, material and bonding agent solid ratio/proportion lower:

• 无 machine material = 20-30%.

• has machine material = 10-15%.

• 炭黑 = 5-10%.

3, dispersion assessment, （ table/sheet 2） in lower testing methods can used for and comparison dispersant and dispersion quality.

table/sheet 2. 确定颜 material or filler dispersion quality testing methods.

dispersion quality how to effect/influence scratch and transparent degree 示例如（图3） 示.

图3. dispersant type type, upper amount and dispersion solution/scheme for scratch testing and transparent degree amount has large effect/influence