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Polyamide/Nylon Molding Powder 聚酰胺/尼龙铸造模粉的粘度测量

Polyamide/Nylon Molding Powder 聚酰胺/尼龙铸造模粉的粘度测量
Application 应用
ASTM D 789-98 标准提供了一个测量聚酰胺/尼龙铸造模粉粘度的标准方法。聚
酰胺的分子量越大，也就意味着尼龙的分子链越长，其在所选用溶剂里的一定浓度下的
粘度就越大。对于固体制模产品来讲，大的分子量比小的分子量具有更大的强度和韧度。
因此，如果一种物质在一定浓度下的溶液具有特定的粘度，那么就可以通过测量粘度来
预测制模材料中与之有关的其它性能例如韧度。
ASTM D 789-98 provides an official, standardized procedure fortesting polyamide
or nylon molding powders. The higher the molecular weight of thepolyamide - that
is, the longer the nylon molecules - the higher the viscosity willbe at a given
concentration in the selected solvent. The larger molecules alsocontribute more
significantly to strength and toughness in the solid molded productcompared to the
shorter molecules. Therefore, if a material at a specifiedconcentration in solution
gives a particular viscosity, then that material will most likelygive molded products
having correlating properties such as a related level oftoughness.
Required Equipment 仪器
在这个测量方法中我们建议采用Brookfield LVT 度盘粘度计。样品用8 盎司的圆
形、宽口有螺纹的瓶子盛装，并放在Brookfield TC-501D 恒温水浴里。为了更快速
地进行测量和减少实验误差，也可以采用Brookfield 其它型号的粘度计，例如 LVDV-E,
LVDV-I+ 和LVDV-II+粘度计。
The Brookfield LVT Dial Reading Viscometer is the specifiedinstrument in this
method. The sample is contained in an 8 ounce round, wide-mouthscrew-cap bottle
immersed in a Brookfield TC-501D Circulating Bath. This test canalso be performed
with other Brookfield Viscometers, such as the LVDV-E, LVDV-I+ andLVDV-II+ in
order to save time and minimize error.
Test Method 测量方法
先将粉末溶解在甲酸或M-甲酚里。样品的温度恒定在25±0.1℃。聚酰胺溶液的粘
度与在一定转速下对应使用的转子号见下表：
The powder is dissolved in either formic acid or m-cresol. Thesample temperature
is maintained at25±0.1℃. The expected viscosities of polyamidesolutions and the
corresponding spindles at the specified speeds are shown below:
这里“BVs”是指溶液的"Brookfield 粘
度(单位为cP 或mPa·s)：
用从表盘上的扭矩读数乘以右表上相应
的因子，就是粘度值，单位为cP：
The torque reading from the dial is multiplied
by the appropriate factor from the following
table to provide the viscosity reading in cP:
Options 可选测量方法
用Brookfield 数显式粘度计可以直接读出粘度值，不需要读扭矩值和使用因子表
来计算粘度值。
The Brookfield Digital Viscometers mentioned above provide theviscosity reading in
cP directly, so that the user does not need to read %Torque and usethe factor
tables.
Spindle # for Given Speed in rpm
各转速下的转子编号
BVs
60
rpm
30 rpm 12 rpm
9-100 1
100-200 1
200-500 2 1
Factor at Given Speed in rpm
各转速下对应的因子
转子 12 rpm 30 rpm 60 rpm
LV1 5 2 1
LV2 25 10 5
LV3 100 40 20
LV4 500 200 100

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