A kind of initiating method for acrylamide aqueous solution polymerization

An aqueous solution polymerization and acrylamide technology, which is applied in the field of high molecular polymer synthesis technology, can solve the problems of difficulty in obtaining a polymer product, a large difference in the light intensity of the glue block, and a decrease in light transmittance, and achieves low residual monomer and consumption saving. , the effect of improving utilization

Active Publication Date: 2021-05-11
JIANGSU FEYMER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, UV polymerization is only suitable for thinner systems. Usually, the thickness of the glue block is only about 5cm. If it exceeds 5cm, it will cause difficulties due to the decrease in light transmission.
In addition, the refraction of light by the bubbles generated during the polymerization process will cause a large difference in the light intensity between the upper layer and the lower layer of the rubber block. The gradient effect in the thickness direction of the rubber block is very obvious, and it is difficult to obtain a uniform polymerization product.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 1600kg of industrial-grade acrylamide (40%), 200kg of 2-acryloyloxyethyltrimethylammonium chloride (80%), and 1200kg of deionized water into the batching kettle, and add 2-hydroxy-4'-(2 -Hydroxyethoxy)-2-methylpropiophenone 9kg, azobisisobutylimidazoline hydrochloride 0.03kg, azobisisobutylamidine hydrochloride 0.6kg, azobisisobutyronitrile 0.3kg, azobisisobutyronitrile Disodium diamine tetraacetate, after mixing evenly, add hydrochloric acid to adjust the pH value to 3.5, cool down to 2°C, after deoxygenation, continuously feed the material to the closed belt conveyor polymer belt with ultraviolet lamp, after passing the conveyor belt, the rubber block is formed , and then through rubber cutting, granulation, drying, and grinding to obtain a cationic polyacrylamide product with a molecular weight of 6.5-8 million, a residual monomer of 300-800 ppm, and a dissolution time of 26-32 minutes.

Embodiment 2

[0025] Add 800kg of industrial-grade acrylamide (40%), 1600kg of 2-acryloyloxyethyltrimethylammonium chloride (80%), and 600kg of deionized water into the batching kettle, and add 2-hydroxy-4'-(2 -Hydroxyethoxyl group)-2-methyl propiophenone 12kg, azobisisobutyryl imidazoline hydrochloride 0.08kg, azobisisobutyromidine hydrochloride 0.5kg, azobisisobutyronitrile 0.3kg, azobisisobutyronitrile Disodium diamine tetraacetate 1kg, after mixing evenly, add hydrochloric acid to adjust the pH value to 3.5, cool down to 4°C, after deoxygenation, continuously feed to the closed belt conveyor polymer belt with ultraviolet lamp, after passing the conveyor belt, the rubber block Forming, cutting, granulating, drying and grinding to obtain a cationic polyacrylamide product with a molecular weight of 2 million to 4 million, a residual monomer of 300-500 ppm, and a dissolution time of 23-28 minutes.

Embodiment 3

[0027] Add 1980kg of industrial grade acrylamide (30%), 340kg of acrylic acid (70%), and 290kg of deionized water into the batching kettle, adjust the pH value to 6.0, consume 390kg of NaOH (32%), and then add the initiator 2-hydroxyl-2 - 0.6kg of methyl-1-phenyl-1-acetone, 0.03kg of azobisisobutylimidazoline hydrochloride, 0.3kg of azobisisobutyromidine hydrochloride, 0.2kg of azobisisobutyronitrile, Disodium diamine tetraacetate 1kg, after mixing evenly, add hydrochloric acid or liquid caustic soda to adjust the pH value to 6.0, cool down to 2°C, after deoxygenation, continuously feed to the closed belt conveyor polymer belt with ultraviolet lamp, and pass through the conveyor belt After the rubber block is formed, the anionic polyacrylamide product is obtained after cutting, granulating, drying and grinding, with a molecular weight of 8-12 million, a residual monomer of 400-800ppm, and a dissolution time of 30-45min.

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Abstract

The invention discloses a method for initiating the polymerization of acrylamide aqueous solution. The acrylamide aqueous solution is made of acrylamide monomer, ionic monomer and deionized water. The method is to add a photoinitiator and multiple The azo initiators constitute a stepwise initiation system. After adjusting the pH value, pre-initiated by ultraviolet light, multiple azo initiators stepwise initiate polymerization to obtain polyacrylamide rubber blocks. The stepwise initiation system provided by the present invention: select initiators with corresponding half-lives at different initiation temperatures to provide an appropriate amount of free radicals for the reaction system to ensure that the polymer is extended in a linear structure, so that the synthesized product has lower residual monomers, The monomer conversion rate is high, the solubility is good, and the utilization rate is effectively improved. At the same time, the initiator is fully utilized within a suitable half-life period, which effectively saves the amount of the initiator; avoids delamination of the rubber block, makes the reaction more uniform, and the thickness of the rubber block It can reach 6-12 cm; the product will not have side reactions such as degradation, hydrolysis and cross-linking.

Description

technical field [0001] The invention relates to the field of high molecular polymer synthesis technology, in particular to an initiating method for acrylamide aqueous solution polymerization. Background technique [0002] The process of using chemical initiators to initiate polymerization of acrylamide polymers is relatively mature, but the product quality is unstable and the production cost is relatively high. Photoinitiated polymerization has the advantages of short polymerization time, high output, easy operation and control, low investment, environmental protection and energy saving, and the activation energy required for the reaction is low. It is a new high-efficiency process. However, the photoinitiated polymerization reaction also has disadvantages such as instability, many residual monomers in the product, many insolubles, and slow dissolution rate, which limit the scope of use of the product. [0003] The composite initiation system composed of a redox agent and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/34C08F220/06C08F2/10C08F4/04
Inventor 汤玉业王勤夏承波何国锋魏星光龚敏杰张莉
Owner JIANGSU FEYMER TECH
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