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A kind of preparation method of ultrahigh molecular weight anionic polyacrylamide

A technology of polyacrylamide and ultra-high molecular weight, which is applied in the field of preparation of polyacrylamide, can solve problems such as increase in specific surface area, loss of polymerization heat, low oxygen content, etc., and achieve increased specific surface area, lower content, and high production efficiency Effect

Active Publication Date: 2022-03-25
JIANGSU FEYMER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Compared with bulk reactor polymerization, continuous transmission polymerization partly dissipates the heat of polymerization in the surrounding environment, and partly is absorbed by the steel belt carrier, which makes up for the disadvantage that polyacrylamide colloid is a poor conductor of heat and the heat inside the block is not easily transmitted. , it is very meaningful to increase the relative molecular weight of the polymer, but the specific surface area of ​​the continuous transmission polymerization increases and the transmission device is dynamic. It is difficult to achieve absolute sealing and ultra-low oxygen content.

Method used

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  • A kind of preparation method of ultrahigh molecular weight anionic polyacrylamide

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Embodiment 1

[0031] Embodiment 1: a kind of preparation method of the anionic polyacrylamide of ultrahigh molecular weight, comprises the following steps:

[0032] Step 1. Dissolve the raw material acrylamide and anionic monomer in water and adjust the pH value. In this embodiment, the anionic monomer includes one or two of acrylic acid, methacrylic acid and its sodium salt, and the pH value is adjusted to 5.5~ 6.5.

[0033] Step 2. Add photoinitiator, azo initiator, deoxidizer, metal chelating agent, metal chelating accelerator, cosolvent and chain transfer agent to the polymerization solution after adjusting the pH value in step 1. After stirring evenly, adjust again When the pH value of the polymerization solution is 5.5-6.5, the temperature of the polymerization solution is lowered to -10-5°C, and the oxygen content is reduced to <10ppb by means of a micro-bubble generator. In this embodiment, the oxygen content is preferably <2ppb. The polymer is put into the polymerization device wi...

Embodiment 2

[0047] Embodiment 2: In this embodiment, according to the preparation method of a kind of ultra-high molecular weight anionic polyacrylamide in embodiment 1, and prepare anionic polyacrylamide with the experimental data of specific numerical value, comprise the following steps:

[0048] Step 1. Add 4592kg of industrial grade acrylamide with a mass fraction of 30%, 344kg of anionic monomer methacrylic acid with a mass fraction of 70% and 1000kg of deionized water into the batching kettle, and use a mass fraction of 32%. NaOH adjusts the pH to 6.2;

[0049] Step 2, add the auxiliary material photoinitiator, azo initiator, deoxidizer, metal chelating agent, metal chelating accelerator, cosolvent and chain transfer agent into the batching kettle and mix evenly; preferably, the photoinitiator adopts 0.12kg 2-Hydroxy-2-methyl-1-[4-(2-hydroxyethoxy) phenyl]-1-propanone, the azo initiator adopts 0.24kg of azobisisobutylamidine hydrochloride and 1.2kg azodicyanovaleric acid, the deoxi...

Embodiment 3

[0053] Embodiment 3: In this embodiment, according to the preparation method of a kind of ultra-high molecular weight anionic polyacrylamide in embodiment 1, and prepare anionic polyacrylamide with the experimental data of specific numerical value, comprise the following steps:

[0054] Step 1. Add 3920kg of industrial-grade acrylamide with a mass fraction of 30%, 573.5kg of anionic monomer methacrylic acid with a mass fraction of 70%, and 1000kg of deionized water into the batching kettle, and use a mass fraction of 32%. NaOH to adjust the pH to 6.2;

[0055] Step 2, add the auxiliary material photoinitiator, azo initiator, deoxidizer, metal chelating agent, metal chelating accelerator, cosolvent and chain transfer agent into the batching kettle and mix evenly; preferably, the photoinitiator adopts 0.15kg 2-Hydroxy-2-methyl-1-[4-(2-hydroxyethoxy) phenyl]-1-propanone, the azo initiator adopts 0.18kg of azobisisobutylamidine hydrochloride and 1.0kg azodicyanovaleric acid, the ...

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Abstract

The invention discloses a preparation method of ultra-high molecular weight anionic polyacrylamide, which comprises the following steps: step 1, dissolving raw material acrylamide and anionic monomer in water and adjusting the pH value; step 2, adding the polymerization solution in step 1 Photoinitiators, azo initiators, deoxidizers, metal chelating agents, metal chelating accelerators, cosolvents and chain transfer agents, after stirring evenly, adjust the pH value of the polymerization solution again, cool the polymerization solution and pass ultrafine bubbles The generator is deoxygenated, and the polymer after deoxygenation is put into the polymerization device with inert gas protection and ultraviolet light; step 3, when the polymer on the polymerization device reaches the highest temperature, it enters the heat preservation area to keep warm, and puts the heat preservation The final polymer is glue-cut, granulated, dried, and then further ground and sieved to make anionic polyacrylamide products. The continuous transmission ultraviolet light-induced polymerization mode provided by the invention can synthesize high or ultrahigh molecular weight anionic polyacrylamide products in one step.

Description

technical field [0001] The invention belongs to the field of preparation of polyacrylamide, and in particular relates to a preparation method of ultrahigh molecular weight anionic polyacrylamide. Background technique [0002] The manufacture of polyacrylamide and its derivatives is commonly obtained by free radical polymerization. The free radical polymerization of acrylamide conforms to the general law of free radical chain polymerization, and consists of elementary reactions such as chain initiation, chain growth and chain termination. The chain initiation reaction is the reaction of forming monomer free radical active species. First, the primary free radical is formed by the initiator, and the primary free radical is added to the monomer to form monomer free radical. After the monomer free radical is formed, it continues to add polymerization with other monomers to make its chain grow. Free radicals are highly active and easily terminated by interaction. Chain growth a...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F2/48C08F2/38C08F2/00
Inventor 汤玉业何国锋王勤方叔迈谢金生龚敏杰
Owner JIANGSU FEYMER TECH
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