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Method for preparing low molecular weight polyacrylamide

A technology of polyacrylamide and low molecular weight, which is applied in the field of preparation of polyacrylamide, a functional polymer compound, can solve problems such as difficulties in industrial production, low conversion rate of acrylamide, inability to prepare ultra-low molecular weight polyacrylamide, etc., and achieve Easy to implement, easy to control production conditions, and easy to operate

Inactive Publication Date: 2005-02-16
QUALITY TEST & ANALYTIC MEASUREMENT RES CENT HENAN ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high polymerization activity of acrylamide monomer, it is difficult to prepare low-molecular-weight polyacrylamide, both in the laboratory and in industrial production.
At home and abroad, there are mainly two methods for the preparation of low molecular weight polyacrylamide: one is to polymerize acrylamide in aqueous solution with molecular weight regulators such as isopropanol and sodium formate, but the obtained polyacrylamide has certain The degree of crosslinking and degree of hydrolysis; the second is to carry out precipitation polymerization with organic solvents such as isopropanol, acetone and water, acetone, but the conversion rate of acrylamide in this method is low, and ultra-low molecular weight polyacrylamide cannot be prepared

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Add 8g of isopropanol to a 500ml four-necked flask equipped with electric stirring, constant pressure funnel, thermometer and reflux condenser, dissolve 0.45g of initiator ammonium persulfate with 11g of water, add 23.3g of 30% acrylamide solution, 1.2g of ammonium persulfate solution, warming up to 82°C. At this point, the reactant starts to reflux. After reflux for 10 minutes, keep the internal temperature at 82-85°C, start to add 210g of 30% acrylamide solution and the remaining initiator solution dropwise, and complete the dropwise addition within 2 hours, keeping at 82-85°C Keep the temperature constant for 2 hours, distill the isopropanol out under atmospheric pressure, and lower the temperature to obtain a low molecular weight polyacrylamide solution. According to GB17514-1998, its molecule is 2.6×10 4 .

Embodiment 2

[0014] Same as Example 1, changing the amount of isopropanol to 2.5g, the obtained polyacrylamide solution, according to GB17514-1998, its molecular weight is 10.98×10 4 .

Embodiment 3

[0016] Same as Example 1, changing the amount of isopropanol to 4g, the polyacrylamide solution obtained, according to GB17514-1998, its molecular weight is 5.2 × 10 4 .

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Abstract

This invention discloses a way of producing the polyacrylamide with low molecular weight. This method adopts aqueous solution polymerization, chooses isopropyl alcohol as chain transfer agent and heat transfer agent and disodium edta (EDTA) as stabilizer, carries through polyreaction between 80deg.C and 85deg.C by adding acrylamine solution and initiator solution continuously and respectively and synthesizes the polyacrylamide with low molecular weight of between 2.0X10000 and 12X10000. It overcomes the low conversion of now-existing precipitation polymerization in producing the polyacrylamide with low molecular weight. It is appropriate to be emulsifying agent and adhesive with high molecular weight.

Description

technical field [0001] The invention relates to a preparation method of functional macromolecular compound polyacrylamide, in particular to a preparation method of low molecular weight polyacrylamide. Background technique [0002] Polyacrylamide (PAM) is a kind of high polymer with good water solubility. Because of its excellent flocculation, thickening, drag reduction, adhesion, scale inhibition and other properties, it is widely used in papermaking, coating, oil recovery and other industries. Different uses of polyacrylamide have different requirements for its molecular weight. High molecular weight and super molecular weight polyacrylamide are mainly used as flocculants or oil well water plugging, oil displacement, etc. At present, research at home and abroad is mainly focused on this kind of polyacrylamide. The preparation and modification of acrylamide, but in some applications, such as polymer emulsifiers, low molecular weight polyacrylamide is required. Due to the hi...

Claims

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Application Information

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IPC IPC(8): C08F2/10C08F2/38C08F120/56
Inventor 赵献增朱靖王冬梅李天仚张文楠余学军徐丹董学亮原思国
Owner QUALITY TEST & ANALYTIC MEASUREMENT RES CENT HENAN ACAD OF SCI
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