Trisegment composite initiator for synthesizing super high molecular weight polyacrylamide

A composite initiator and polyacrylamide technology, applied in the field of three-stage composite initiators, can solve the problems of high decomposition temperature of the initiator, too fast reaction, low reactivity of the initiator, etc., and achieve smooth polymerization reaction curve and polymerization reaction speed. Smooth, good product dissolving properties

Inactive Publication Date: 2006-11-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional polymerization initiation system, the reactivity of the initiator is low, and it is difficult to initiate polymerization when the temperature is lower than 15°C
When the temperature rises, although it can be initiated normally, the reaction speed is too fast, and the concentration of free radicals increases rapidly, making the polymerization reaction speed difficult to control
However, the initiator used has a high decomposition temperature and a fast decomposition speed, resulting in an excessively fast polymerization speed.
Especially in the later stage of the polymerization reaction, as the polymerization reaction releases a large amount of heat, the temperature of the reaction system rises sharply, which accelerates the decomposition speed of the init

Method used

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  • Trisegment composite initiator for synthesizing super high molecular weight polyacrylamide
  • Trisegment composite initiator for synthesizing super high molecular weight polyacrylamide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In the laboratory, the method of acrylamide aqueous solution polymerization is carried out under adiabatic conditions. The scale of laboratory synthesis is carried out step by step according to 1200g / pot, 10kg / pot, 20kg / pot, and 50kg / pot.

[0041] 1. Instrument

[0042] Dewar bottles, small polymerization kettles, latex tubes, temperature recorders, constant temperature water baths, analytical balances, nitrogen and nitrogen ventilation devices, porous ceramics, stirrers, glass instruments, ovens, colloid mills, fluidized bed dryers, etc.

[0043] 2. Chemical reagents

[0044] Acrylamide AM (industrial grade); Potassium persulfate, analytical grade; Sodium sulfite, analytical grade; Sodium hydroxide, chemically pure; Phthaloyl peroxide, analytical grade; N, N-xylidine, analytical grade; Tetraethyl Diamine, analytical grade; N,N-dimethyl-p-toluidine (DMT), analytical grade; urea oxide, analytical grade; deionized water, impedance ≥ 18.2MΩ, etc.;

[0045] 3. Experiment...

Embodiment 2

[0053] Industrial production, adopting adiabatic tank reactor, hydrolysis process after polymerization, and the synthesis scale is 8 tons / kettle.

[0054] 1. Equipment

[0055] Dissolving tank (10 tons), polymerization kettle (10 tons), pre-grinding machine, temperature recorder, hydrolysis machine, granulator, nitrogen and nitrogen ventilation device, fluidized bed dryer, etc.

[0056] 2. Chemical reagents

[0057] Acrylamide AM (technical grade); Ethylene glycol dimethacrylate (technical grade); Potassium persulfate, analytical grade; Sodium sulfite, analytical grade; Sodium hydroxide, chemically pure; Disodium ethylenediamine tetrahexanoate, analytical Pure; Phthaloyl peroxide, analytical grade; N,N-xylidine, analytical grade; Tetraethyldiamine, analytical grade; N,N-dimethyl-p-toluidine (DMT), analytical grade; Oxygenated urea, analytical grade; deionized water, impedance ≥ 18.2MΩ, etc.;

[0058] 3. Experimental steps

[0059] (1) Prepare an aqueous solution of 26% acr...

Embodiment 3

[0065] a trigger system

[0066]

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Abstract

The invention discloses a three-segmented composite initiator of super-molecular weight polyacrylamide, which is characterized by the following: three-segmented initiator system is composed of reacting speed control agent, solutizer, one-segmented, two-segmented, three-segmented initiator according to certain proportioning; the polyacrylamide with over 25,000 thousand molecular weight can be synthesized stably in the industrial manufacturing, whose reacting speed can be controlled effectively.

Description

technical field [0001] The invention relates to a three-stage composite initiator for synthesizing ultrahigh molecular weight polyacrylamide. Background technique [0002] The free radical polymerization theory shows that the chain length is inversely proportional to the square root of the initiator concentration, the average degree of polymerization is directly proportional to the kinetic chain length, and the amount of the initiator has a significant impact on the average molecular weight of the polymer. The use of low-activity initiators can reduce the polymerization reaction speed. The polyacrylamide product has a large relative molecular mass, but the activity of the initiator is too low, too few free radicals are generated, and there are few active points for initiating monomer polymerization. Polymerization cannot be fully initiated, and some molecular chains in the polymer will grow excessively, which may increase the probability of mutual reaction and entanglement b...

Claims

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Application Information

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IPC IPC(8): C08F120/56C08F4/00
Inventor 周云霞
Owner PETROCHINA CO LTD
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