Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for polymer latex washing by membrane process

A polymer latex and polymer technology, applied in the field of polymer latex washing, can solve the problems of unfavorable industrial production and application, complex process control, large equipment investment, etc., and achieve easy large-scale application in industrial production, reduce consumption, The effect of reducing labor intensity

Active Publication Date: 2012-05-30
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process control of this method is more complicated, it is not easy to scale up, and the investment in equipment is relatively large, which is not conducive to the application of industrial production

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for polymer latex washing by membrane process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] See figure 1 . A device for washing polymer latex by membrane method comprises 1. raw material liquid feed valve 2. pure water valve 3. raw material liquid storage tank with stirring paddle 4. discharge valve 5. feed valve 6. pump 7. micro Filter membrane 8. Conductivity meter 9. Return valve. The washing process adopts pre-concentration, intermittent constant volume diafiltration, and post-concentration processes.

[0025] First open the valve 1 to put the polymer material liquid (solid content about 6% and conductivity 100 μs / cm) after the reaction is complete and demulsified into the storage tank 3, open the stirring paddle, open the valve 5, and use the pump 6 to pump the material Pump the liquid into the microfiltration membrane 7, adjust the opening of the valve 9, and keep the permeate at 150L.m -2 .h -1 The flux passes through the microfiltration membrane 7 with a membrane hole of 0.2 μm until the volume of the feed liquid in the feed liquid tank 3 is 1 / 3 of...

Embodiment 2

[0027] See figure 1 . A device for washing polymer latex by membrane method comprises 1. raw material liquid feed valve, 2. pure water valve, 3. raw material liquid storage tank with stirring paddle, 4. discharge valve, 5. feed valve, 6. .Pump, 7. Microfiltration membrane, 8. Conductivity meter, 9. Return valve. The washing process adopts pre-concentration, continuous constant volume diafiltration, and post-concentration processes.

[0028] First open the valve 1 to put the polymer material liquid (solid content about 6% and conductivity 100 μs / cm) after the reaction is complete and demulsified into the storage tank 3, open the stirring paddle, open the valve 5, and use the pump 6 to pump the material Pump the liquid into the microfiltration membrane 7, adjust the opening of the valve 9, and keep the permeate at 100L.m -2 .h -1 The flux passes through the microfiltration membrane 7 with a membrane hole of 0.1 μm until the volume of the feed liquid in the feed liquid tank 3...

Embodiment 3

[0030] See figure 1 . A device for washing polymer latex by membrane method comprises 1. raw material liquid feed valve, 2. pure water valve, 3. raw material liquid storage tank with stirring paddle, 4. discharge valve, 5. feed valve, 6. .Pump, 7.Ultrafiltration membrane, 8.Conductivity meter, 9.Return valve. The washing process adopts the process of pre-concentration and continuous variable volume diafiltration.

[0031] First open the valve 1 to put the polymer material liquid (solid content about 6% and conductivity 100 μs / cm) after the reaction is complete and demulsified into the storage tank 3, open the stirring paddle, open the valve 5, and use the pump 6 to pump the material Pump the liquid into the ultrafiltration membrane 7, adjust the opening of the valve 9, and keep the permeate at 80L.m -2 .h -1 The flux passes through the ultrafiltration membrane 7 with a molecular weight cut-off (MWCO) of about 150kDa, until the volume of the feed liquid in the feed liquid t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Conductanceaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for polymer latex washing by a membrane process. The method relates to a process utilizing a microfiltration or ultrafiltration technology to recover and wash a polymer emulsion or a suspending solution obtained from emulsion polymerization and suspension polymerization. The method comprises: first concentrating a polymer emulsion or a suspending solution after reaction with a microfiltration membrane or an ultrafiltration membrane to a certain degree, then adding ultrapure water into the liquid material for washing, with polymer particles intercepted by the membrane, and leaving the washing liquid to permeate the microfiltration membrane or the ultrafiltration membrane continuously till the conductivity of the washed washing liquid is lower than a specified value, finally concentrating the polymer to a set value, and letting the washed and small molecular impurity removed polymer enter a subsequent drying technology directly. The method of the invention substantially reduces the water consumption during washing of the polymer by the liquid material which washes the polymer fully, and reduces the generation of defective goods resulted from small molecular impurity residual, as well as has the advantages of simple technological operation and easy realization of continuous production.

Description

field of invention [0001] The invention relates to a method for washing polymer latex, in particular to a method for washing polymer emulsion and suspension obtained by aqueous phase polymerization. Background technique [0002] Some small molecular impurities remain in the polymer suspension or emulsion obtained by suspension polymerization or emulsion polymerization, which will affect the final product quality of the polymer. It is necessary to perform solid-liquid separation on the suspension or emulsion obtained after the reaction, and at the same time realize the washing. The solid-liquid separation and washing methods commonly used in the actual production process mainly include centrifugation and plate-and-frame filter press method. The centrifugation method uses a high-speed centrifuge to precipitate polymer particles, but some polymer particles are small and require a higher Only by centrifugal force can it be completely precipitated, and incomplete centrifugation ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08F6/16C08F6/24
Inventor 杭晓风万印华陈向荣苏仪
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI