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Preparation of high molecular weight instant cation polyacrylamide

A polyacrylamide and high molecular weight technology, applied in the chemical industry, can solve the problems of unstable product molecular weight, slow dissolving speed, difficult to control heat release, etc., and achieve the effect of excellent coagulation effect, simple process and high molecular weight

Inactive Publication Date: 2009-01-28
朱定洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods all adopt the process of bulk polymerization in aqueous solution. Although different initiator systems, different initiation temperatures, monomer concentrations and ratios, and additive types have been used to obtain cationic polypropylene with different molecular weights and ionic degrees. However, this process has disadvantages such as difficulty in controlling the heat release during the polymerization process, unstable molecular weight of the product, and slow dissolution rate. Moreover, due to the use of bulk polymerization, the process is more complicated, requiring additional cutting, crushing and other processes, and the cost is relatively high. High and labor intensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Mix acrylamide 70Kg, 2-acryloxyethyl trimethylammonium chloride 29.4Kg, ethylenediaminetetraacetic acid disodium 0.1Kg, N-methylolacrylamide 0.1Kg, benzoin methyl ether 0.2Kg, Ethylenediamine 0.1Kg, isopropanol 0.05Kg, polyoxyethylene aralkyl ether 0.05Kg, potassium persulfate 1Kg, sodium ammonium sulfite 1Kg stirred and dissolved in 300Kg deionized water, spread out into flakes on a closed conveyor belt , The depth of the liquid is 2~5cm, high-purity nitrogen is introduced to replace the air, and the high-pressure mercury lamp is turned on to initiate polymerization. After 3~4 hours, the product has turned into a gel. The gel is dried at 60℃ for 5 hours and then taken out for granulation. . It was further dried thoroughly at 50°C and pulverized into powder to obtain the product. The measured molecular weight was 12 million. The product can be quickly and completely dissolved in water.

Embodiment 2

[0017]Mix acrylamide 70Kg, methacryloxyethyl trimethylammonium nitride 29.4Kg, ethylenediaminetetraacetic acid disodium 0.1Kg, N-methylolacrylamide 0.1Kg, benzoin methyl ether 0.2Kg, 0.1Kg of ethylenediamine, 0.05Kg of polyoxyethylene aralkyl ether, 1Kg of potassium persulfate, and 1Kg of sodium bisulfite are dissolved in 300Kg of deionized water with stirring, and are divided into 10 stainless steel basins with a width of 40cm and a length of 60cm. The depth of the liquid is 2~5cm. Put it in a UV box at room temperature (25℃), close it, blow in nitrogen to replace the air, turn on the high-pressure mercury lamp to initiate polymerization, after 5 hours, the product has become gelatinous and dried at 60℃ After 5 hours, it was taken out for granulation, and it was further dried thoroughly at 50°C and crushed into powder to obtain the product. The measured molecular weight was 14 million. The product can be quickly and completely dissolved in water.

Embodiment 3

[0019] Mix acrylamide 65Kg, methacryloxyethyl trimethylammonium chloride 24.5Kg, 2-acryloxyethyltrimethylammonium chloride 10Kg, disodium ethylenediaminetetraacetate 0.1Kg, boric acid 0.1 Kg, benzoin 0.4Kg, ethylenediamine 0.1Kg, glycerin fatty acid ester 0.05Kg, sodium persulfate 1Kg, sodium bisulfite 1Kg stirred and dissolved in 300kg deionized water, spread out into flakes on a closed conveyor belt, liquid At a depth of 3cm, blow in high-purity nitrogen, replace the air, turn on the high-pressure mercury lamp to initiate polymerization. After 3 hours, the product has turned into a gel. The gel is dried at 45°C for 5 hours and then taken out for granulation. It is thoroughly dried at ℃ and pulverized into powder to obtain the product with a measured molecular weight of 16 million. The product can quickly and completely dissolve in water.

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Abstract

The invention relates to a preparation method for instant cation polyacrylamide with a high molecular weight. The monomer of acrylamide and a cation type monomer are used as the main materials, firstly, the acrylamide and a comonomer are dissolved into deionized water; then a photoinitiator and / or a photosensitizer additive and a redox initiator are added in the solution to form a compound initiating system; the materials of the components are uniformly mixed in a viscous state, poured on a plane and paved into a sheet shape, introduced with high purity nitrogen, then ultraviolet light illumination is carried out to the materials paved into the sheet shape; after the materials of the viscous state are in a gel block, the materials are dried, broken, granulated and cracked to obtain a product of a dry powder shape. In the invention, the heat release and temperature rising of bulk adiabatic polymerization are avoided, while the polymerization and drying are carried out under a lower temperature; therefore, the reaction process is stable; the product has the advantages of higher molecular weight, better solubility, faster dissolving speed, simple technique and low cost; in addition, the processing after polymerization reduces the working procedure of breaking of bulk gel.

Description

Technical field [0001] The invention relates to a method for preparing high molecular weight instant cationic polyacrylamide by light-initiated polymerization of thin sheets. The cationic polyacrylamide is mainly used in the water treatment industry to realize the purpose of environmental protection and water saving, and belongs to the technical field of chemical industry. Background technique [0002] Polyacrylamide (PAM) is a polymer compound obtained by polymerization of acrylamide (AM). In a broad sense, PAM includes homopolymers and copolymers of acrylamide, and usually contains more than 50% acrylamide monomer structure. The polymer of the unit is called polyacrylamide, and the molecular weight can range from thousands to tens of millions. According to the ionization of PAM in aqueous solution, it can be divided into nonionic (Nonionic Polyacylamide, NPAM), anionic (Anionic Polyacrylamide, APAM), cationic (Cationic Polyacrylamide, CPAM) and amphoteric (Amphoteric Polyacryla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F2/50
Inventor 朱定洋
Owner 朱定洋
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