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Method for producing low-residue monoacrylamide polymer

A technology for acrylamide and polymers, which is applied in the field of producing low-residue monoacrylamide polymers. It can solve the problems of short belt polymerization time, high residual monomers, and insufficient polymerization, and avoid side reactions such as crosslinking and crosslinking. The effect of low linkage and low residual monomer

Inactive Publication Date: 2019-12-13
JIANGSU FEYMER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for producing low-residue monoacrylamide polymers, which solves the problems of medium and high temperature azo initiator utilization caused by the short time of acrylamide light-initiated belt polymerization and the poor traditional heat preservation effect in the prior art. Low, insufficient polymerization, high residual monomer shortcomings, realize the production of low residual monomer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 5600kg of industrial grade acrylamide (concentration is 30%), 8.4kg of urea (auxiliary material), 390kg of deionized water (solvent) into the batching kettle, and then add photoinitiator 2-hydroxyl-2-methyl-1-phenyl -1-Acetone 0.15kg, azobisisobutylimidazoline hydrochloride (medium temperature, 40-50°C) 0.2kg, azobisisobutylamidine hydrochloride (medium temperature, 50-60°C) 0.4kg, azo 0.2kg of diisobutyronitrile (high temperature, above 70°C), 1kg of disodium ethylenediaminetetraacetic acid (auxiliary material) were added to the batching kettle and mixed evenly, and the pH was adjusted to 5.0 by NaOH (concentration 32%, pH regulator), and the temperature was lowered to 0°C, after the polymerization liquid is deoxygenated by nitrogen, it is continuously fed to the polymerization belt with ultraviolet lamp and nitrogen protection. The depth of the polymerization liquid is 16cm. Medium temperature 50-60°C—high temperature above 70°C is triggered by four temperature st...

Embodiment 2

[0031] Add 3640kg of industrial grade acrylamide (concentration: 30%), acrylic acid (concentration: 70%, anionic monomer) 643.5kg, deionized water 1000kg into the batching kettle, use NaOH (concentration: 32%) to adjust the pH value to 6.0, Then 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy) phenyl]-1-acetone (photoinitiator) 0.25kg, azobisisobutylamidine hydrochloride (medium temperature , 50-60°C) 0.26kg, azobisisobutyronitrile (high temperature, above 70°C) 0.56kg, edetate disodium (excipient) 0.2kg, urea (excipient) 4.2kg, add to the batching kettle and mix evenly, Use hydrochloric acid or NaOH (32%) to adjust the pH to 6.0 again. After the polymerization liquid is deoxygenated by nitrogen, it is pumped into the polymerization belt with ultraviolet lamp and carbon dioxide protection through the feeding pump. In this embodiment, there is a low temperature- —Medium temperature 50-60°C—high temperature above 70°C is triggered by three temperature steps. The depth of the polymeriz...

Embodiment 3

[0033] Add 427.5kg of industrial grade acrylamide (concentration is 40%), 2-acryloyloxyethyltrimethylammonium chloride (cation monomer, concentration is 80%) 1211kg, deionized water 1361Kg in the batching kettle, simultaneously 2-Hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone 12kg, azobisisobutylimidazoline hydrochloride 0.08kg, azobisisobutamidine Add 0.5kg of hydrochloride, 0.7kg of azobisisobutyronitrile, and disodium ethylenediaminetetraacetic acid into the batching kettle and mix evenly. Use hydrochloric acid to adjust the pH to 4.2, and cool down to 2°C. The pump is pumped into the polymerization belt with ultraviolet lamp and nitrogen protection. The depth of the polymerization liquid is 16cm. When the temperature of the online monitoring polymer reaches 65°C, the polymer colloid enters the heat preservation area. The rubber was cut, granulated, dried, and ground to obtain a cationic polyacrylamide product with a molecular weight of 12.87 million, residual a...

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Abstract

The invention discloses a method for producing a low-residue monoacrylamide polymer. The method comprises the following steps: preparing a polymerization solution containing acrylamide, an ionic monomer, an auxiliary material, a solvent, a pH value regulator and an initiator; placing the polymerization solution on a polymerization belt which is protected by a gas and is continuously conveyed; carrying out low temperature-to-high temperature stepped initiation on the polymerization solution placed on the polymerization belt by using a composite initiator, wherein the composite initiator comprises a low-temperature photoinitiator and a medium-high-temperature polyazo initiator; and performing microwave radiation when the temperature in the reaction reaches the highest temperature or the temperature of a rubber block is reduced to achieve heat insulation of the rubber block. The photo-initiation and polyazo stepped initiation system and microwave radiation heat insulation are adopted, sothe synthesized product has the advantages of low residual monomer, low crosslinking degree, good solubility, simple process and easiness in industrial production.

Description

technical field [0001] The invention relates to a method for producing low-residue monoacrylamide polymer. Background technique [0002] Acrylamide polymers are widely used in industries such as water treatment, papermaking, mineral flotation, and oil field exploitation for the purpose of environmental protection and water conservation. [0003] In the production process of acrylamide polymers, ribbon-type photoinitiated polymerization has the advantages of no temperature control, fast polymerization speed, high efficiency, easy operation and control, low investment, environmental protection and energy saving, and the product has a high molecular weight. A new process for efficient production of polyacrylamide. However, ribbon-type photoinitiated polymerization is only suitable for thinner systems. Usually, the thickness of the rubber block is only about 5cm. If it exceeds 5cm, it will cause difficulty in initiation due to reduced light transmission and low monomer conversi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F220/56C08F220/06C08F220/34C08F220/58C08F4/04C08F2/48
CPCC08F2/48C08F4/04C08F120/56C08F220/06C08F220/34C08F220/56
Inventor 汤玉业王勤何国锋魏星光
Owner JIANGSU FEYMER TECH
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