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A kind of synthetic method of polyacrylamide of high molecular weight

A technology of polyacrylamide and synthesis method, which is applied in the field of organic synthesis, can solve the problems of limiting the production and application of acrylamide, and achieve the effects of short reaction time, high efficiency and mild reaction conditions

Inactive Publication Date: 2016-03-30
ANHUI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned initiator systems all need nitrogen protection in the process of initiating the reaction, and generally must be carried out at medium and high temperatures, which greatly limits the production and application of acrylamide

Method used

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  • A kind of synthetic method of polyacrylamide of high molecular weight
  • A kind of synthetic method of polyacrylamide of high molecular weight
  • A kind of synthetic method of polyacrylamide of high molecular weight

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of synthetic method of the polyacrylamide of high molecular weight, comprises the following steps:

[0019] Dissolve 191g of acrylamide in 1000ml of distilled water to prepare a monomer solution with a mass fraction of 16%, stir until it is completely dissolved, heat to 30°C and keep it warm, and the prepared SmCl 3 ·6H 2 O and NaHSO 3 Prepare solid powder as the initiator according to the amount ratio of the substance of 1:4, the ratio of the amount of the amount of the initiator to the monomer is 1:400, stir, continue to react for 1h, stop the reaction, add 100ml of absolute ethanol to initiate precipitation, and pump under reduced pressure Filter, wash the precipitate twice with absolute ethanol, and dry until the mass is constant to obtain polyacrylamide.

[0020] SmCl 3 ·6H 2 The preparation method of O:

[0021] Will Sm 2 o 3 Dissolve the solid powder in hydrochloric acid with a concentration of 6mol / L, stir, heat until a small amount of solid precip...

Embodiment 7

[0027] A kind of synthetic method of the polyacrylamide of high molecular weight, comprises the following steps:

[0028] Dissolve 191g of acrylamide in 1000ml of distilled water to prepare a monomer solution with a mass fraction of 16%, stir until it is completely dissolved, heat to 30°C, keep warm, and prepare the YbCl 3 ·6H 2 O and NaHSO 3 Prepare solid powder as the initiator according to the amount ratio of the substance at 1:5, the ratio of the amount of the substance of the initiator to the monomer is 1:200, stir, continue to react for 2h, stop the reaction, add 100ml of absolute ethanol to initiate precipitation, and pump under reduced pressure Filter, wash the precipitate twice with absolute ethanol, and dry until the mass is constant to obtain polyacrylamide.

[0029] The YbCl 3 ·6H 2 The preparation method of O is: weigh a certain mass of La 2 o 3 , dissolved in hydrochloric acid, slowly evaporated and crystallized, dried at 60°C to constant weight, sealed and...

Embodiment 7-17

[0030] Embodiment 7-17, initiator is YbCl 3 ·6H 2 O-NaHSO 3 , according to the following table 2 conditions.

[0031] The following table 2 has provided the reaction conditions and the result of embodiment 7-17.

[0032] Table 2

[0033]

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PUM

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Abstract

The invention discloses a method for synthesizing polyacrylamide with a high molecular weight. The method comprises the following steps: dissolving acrylamide in distilled water, stirring until acrylamide is completely dissolved, adding a compound composed of a chloride of a rare earth metal and NaHSO3 under a heating condition, stirring to react for a period of time, stopping the reaction, adding a small amount of absolute ethyl alcohol to initiate precipitation, stewing, performing vacuum filtration, washing the precipitate twice by using absolute ethyl alcohol, and drying until the mass is constant to obtain polyacrylamide with high molecular weight. Compared with the prior art, the compound composed of chloride hydrate of the rare earth metal and NaHSO3 is used as an initiator, absolute ethyl alcohol is used as a precipitation initiator, no inert atmosphere is needed, the reaction is performed in an open system under a normal temperature condition, the reaction time is short, polyacrylamide with high molecular weight has small energy source cost, the highest yield can reach 100%, and a new way is provided for batch industrial production of polyacrylamide with high molecular weight under mild conditions.

Description

technical field [0001] The invention relates to the field of organic synthesis, in particular to a method for synthesizing high molecular weight polyacrylamide. Background technique [0002] Polyacrylamide has been widely used in the paper industry, petroleum industry, mining industry, metallurgical industry, pharmaceutical industry and other fields due to its excellent flocculation and fluid resistance reduction. The synthesis methods of polyacrylamide include aqueous solution polymerization, emulsion polymerization, radiation polymerization, instant polymerization, gasification and desolventization, etc. [0003] In the prior art, there are many studies on the synthesis of polyacrylamide, but few use rare earth metals as acrylamide polymerization initiators. Feng Siwei, Xu Xiaodong, Chen Lingling, Zhu Yuanqi and others used trifluoromethanesulfonate as a catalyst to catalyze the polymerization of acrylamide. However, the above-mentioned initiator systems all need nitroge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/56C08F4/12C08F4/08
Inventor 盛恩宏韩寒孙军勇
Owner ANHUI NORMAL UNIV