Name: polyether polyol
|Molecular weight MW|
|Moisture Content(%)||< 0.05|
The performance indexes of methacrylate include hydroxyl value, acid value, moisture, pH value, viscosity, composition, unsaturation, degree of polymerization, relative molecular weight, etc.
Polyether polyol Refining is one of the most common chemical plant materials. The performance indexes of methacrylate include hydroxyl value, acid value, water content, pH value, viscosity, composition, unsaturation, degree of polymerization, relative molecular weight, etc. generally, manufacturers publish other performance indicators except for the relative molecular weight. It is necessary for Guangzhou Wenlong chemical to analyze the common index values its practical significance.
1、 Hydroxyl value
Hydroxyl value is the basis for measuring the quantity number average relative molecular weight of a substance. It is particularly important to accurately manipulate the mass ratio of acrylate to polyether polyol (- - NCO / - - OH), predict analyze the viscosity of pet prepolymer, define the soft segment composition obtain the foamed polyurethane products with stable properties. In addition, it is also a key indicator value for monitoring the reflection level of polyester polyols.
2、 Acid value
The pH pH value of polyether polyol will immediately damage the reflection specificity of Dongda polyether polyol, will cause high low harm to the measured value of hydroxyl value. In the measurement of hydroxyl value, the measured value of acid alkaline polyether polyol should be calibrated in many aspects, that is, the calibration of hydroxyl value is equivalent to the sum of measured hydroxyl value acid value. Generally, the acid value of polyether polyols is very low, which can be ignored in the calibration of hydroxyl value; however, polyester polyols usually contain a small amount of acid-base chemical residues in the commodity because of the use of citric acid as raw material, so that the commodity has a certain acid value. The acid value of polyester polyol must be lower than 2.0mgkoh/g, otherwise it will bring adverse harm to the production process product characteristics, so it is very important to measure the acid value of polyester polyol.