Method for preparing high molecular weight cationic polyacrylamide employing single-initiator

A technology of polyacrylamide and polyacrylamide powder, which is applied in the field of polyacrylamide preparation, can solve problems such as difficulty in discharging materials, impact on use effects, and non-compliance with environmental protection, and achieve the effect of improving solubility

Inactive Publication Date: 2010-02-24
SHANDONG POLYMER BIO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, when DMDAAC is used as a cationic monomer, it is difficult to produce a cationic polyacrylamide with a high molecular weight when the cationic degree is greater than 10%. There are few reports in the literature that the molecular weight exceeds 10 million. Poor, because the molecular weight is low, so the material sticks to the wall of the kettle and the toughness is poor, and it is difficult to discharge the material. It is not suitable to adopt the easiest industrial production of kettle polymerization; and the cationic polyacrylamide molecular weight of DAC as a cationic monomer can easily reach more than 10 million. , and has excellent solubility, and can be polymerized in a kettle; DMC has a higher molecular weight than the cationic polyacrylamide prepared by DMDAAC, but not as high as DAC, and its activity is slightly worse than DAC
Therefore, DAC and DMC cationic polyacrylamides have become research hotspots. The traditional cationic polyacrylamide production process uses many types of additives and large dosages. The relative molecular weight of the product is low and the solubility is poor. development needs
Moreover, the added additives are easy to cause secondary pollution during use, which does not meet the requirements of environmental protection, and the use effect will also be affected to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1: Calculated by mass percentage, 209.4 g of acryloyloxyethyltrimethylammonium chloride (DAC) with a concentration of 80%, 529.5 g of 25% acrylamide (AM) solution, and 267 g of deionized water were weighed. Set aside a certain amount of deionized water to mix the initiator sodium pyrosulfite, mix the remaining raw materials in a 2L beaker, lower the temperature of the material to 6°C, add it to a thermos bottle, blow nitrogen for 30 minutes, and mix 0.01g of sodium pyrosulfite into Add the solution into the thermos bottle and continue to pass nitrogen gas for 15 minutes, turn off the vent, turn off nitrogen gas, seal the adiabatic polymerization, after the system rises to the highest temperature, keep it warm for 4 hours, cool down and discharge, granulate, dry, crush, and sieve to obtain the characteristics White cationic polyacrylamide powder with a viscosity number of 25.2dL / g, a cationic degree of 30%, and a dissolution time of less than 60 minutes.

Embodiment 2

[0009] Example 2: Calculated by mass percentage, 324.5 g of acryloyloxyethyltrimethylammonium chloride (DAC) with a concentration of 80%, 568 g of 25% acrylamide (AM) solution, and 107.5 g of deionized water were weighed. Set aside a certain amount of deionized water to mix the initiator sodium pyrosulfite, mix the rest of the raw materials in a 2L beaker, lower the temperature of the material to 6°C, add it to a thermos bottle, blow nitrogen for 30 minutes, and mix 0.015g of sodium pyrosulfite into Add the solution into the thermos bottle, continue to pass nitrogen for 15 minutes, turn off the vent, turn off the nitrogen, seal the adiabatic polymerization, after the system rises to the highest temperature, keep it warm for 4 hours, cool down and discharge, granulate, dry, pulverize, and sieve to obtain A white cationic polyacrylamide powder with an intrinsic viscosity of 23.11dL / g, a cationic degree of 40%, and a dissolution time of less than 60 minutes.

Embodiment 3

[0010] Example 3: Calculated by mass percentage, 396.74 g of methacryloxyethyltrimethylammonium chloride (DMC) with a concentration of 80%, 530.43 g of 25% acrylamide (AM) solution, deionized water 72.83g, set aside a certain amount of deionized water to mix with initiator sodium metabisulfite, mix the rest of the raw materials in a 2L beaker, lower the temperature of the material to 6°C, add it to a thermos bottle, blow nitrogen for 30min, and dissolve 0.018g of coke Make a solution of sodium sulfite and add it into a thermos bottle, continue to pass nitrogen gas for 15 minutes, turn off the vent, turn off nitrogen gas, and conduct airtight adiabatic polymerization. After separation, the intrinsic viscosity was 18.6dL / g, the cationic degree was 45%, and the white cationic polyacrylamide powder was dissolved in less than 60 minutes.

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PUM

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Abstract

The invention relates to a method for preparing high molecular weight cationic polyacrylamide employing single-initiator. The technical scheme comprises the following steps: mixing 10-90 parts of acrylamide and 10-90 parts of cationic monomer, keeping the temperature of raw materials to 0-10 DEG C, adding all initiator sodium pyrosulfite to react while adopting adiabatic method to realize naturaltemperature rise, keeping the temperature after the reaction, reducing the temperature to discharge, pelleting, drying, grinding and screening to prepare the cationic polyacrylamide power product which is very soluble in water. The beneficial effect of the invention is that the method has the advantage of less type of the used initiator, low dosage of the initiator, simple process, high molecularweight of the product, good solubility and the like, the method is applicable to industrialized production; and the method can overcome the defect of the traditional method that additive is added toomuch so that the secondary pollution is easy to cause and the using effect is affected.

Description

1. Technical field: [0001] The invention relates to a method for preparing polyacrylamide, in particular to a method for preparing high molecular weight cationic polyacrylamide with a single initiator. 2. Background technology: [0002] At present, cationic monomers for the production of cationic polyacrylamide products mainly include dimethyl diallyl ammonium chloride (DMDAAC), acryloyloxyethyltrimethylammonium chloride (DAC) and methacryloyloxyethyl Trimethylammonium chloride (DMC) and several others. Among them, when DMDAAC is used as a cationic monomer, it is difficult to produce a cationic polyacrylamide with a high molecular weight when the cationic degree is greater than 10%. There are few reports in the literature that the molecular weight exceeds 10 million. Poor, because the molecular weight is low, so the material sticks to the wall of the kettle and the toughness is poor, and it is difficult to discharge the material. It is not suitable to adopt the easiest indu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F220/56C08F4/08
Inventor 夏春良刘皓周卫东刘艳霞陈宗令
Owner SHANDONG POLYMER BIO CHEM CO LTD
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