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Preparation of high molecular weight instant cation polyacrylamide

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

Inactive Publication Date: 2010-10-13
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

[0016] Acrylamide 70Kg, 2-acryloyloxyethyltrimethylammonium chloride 29.4Kg, edetate disodium 0.1Kg, N-methylolacrylamide 0.1Kg, benzoin methyl ether 0.2Kg, 0.1Kg of ethylenediamine, 0.05Kg of isopropanol, 0.05Kg of polyoxyethylene aralkyl ether, 1Kg of potassium persulfate, and 1Kg of sodium bisulfite are stirred and dissolved in 300Kg of deionized water, and spread into thin sheets on a closed conveyor belt , the depth of the liquid is 2-5cm, replace the air with high-purity nitrogen, and turn on the high-pressure mercury lamp to initiate polymerization. After 3-4 hours, the product has become a gel. Dry the gel at 60°C for 5 hours and take it out to granulate . Further, it is thoroughly dried at 50° C., crushed into powder to obtain the product, and the measured molecular weight is 12 million, and the product can be rapidly and completely dissolved in water.

Embodiment 2

[0018]70Kg of acrylamide, 29.4Kg of methacryloxyethyltrimethylammonium nitride, 0.1Kg of disodium edetate, 0.1Kg of N-methylolacrylamide, 0.2Kg of benzoin methyl ether, Ethylenediamine 0.1Kg, polyoxyethylene aralkyl ether 0.05Kg, potassium persulfate 1Kg, sodium bisulfite 1Kg are stirred and dissolved in 300Kg deionized water, and evenly distributed in 10 40cm wide, 60cm long stainless steel basins, The depth of the liquid is 2 to 5 cm. Put it into a UV box at room temperature (25°C) and close it, blow in nitrogen to replace the air, turn on the high-pressure mercury lamp to initiate polymerization, and the product has become gel after 5 hours, and dry at 60°C After 5 hours, it was taken out for granulation, further dried thoroughly at 50° C., and pulverized into a powder to obtain the product. The measured molecular weight was 14 million, and the product could be quickly and completely dissolved in water.

Embodiment 3

[0020] Acrylamide 65Kg, methacryloxyethyltrimethylammonium chloride 24.5Kg, 2-acryloyloxyethyltrimethylammonium chloride 10Kg, edetate disodium 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 into flakes on a closed conveyor belt, liquid The depth is 3cm, high-purity nitrogen gas is introduced to replace the air, and the high-pressure mercury lamp is turned on to initiate polymerization. After 3 hours, the product has become gel-like. After drying the gel at 45°C for 5 hours, take it out and granulate it, and then further dry it at 55°C. Thoroughly dried at ℃, crushed into powder to obtain the product, and the measured molecular weight was 16 million. The product dissolves quickly and completely 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 slices. The cationic polyacrylamide produced is mainly used in the water treatment industry to achieve the purpose of environmental protection and water saving, and belongs to the technical field of chemical industry. Background technique [0002] Polyacrylamide (Polyacrylamide, PAM) is a polymer compound obtained by the polymerization of acrylamide (Acrylamide, AM). In a broad sense, PAM includes homopolymers and copolymers of acrylamide, usually containing more than 50% of acrylamide monomer structure The polymer of the unit is called polyacrylamide, and the molecular weight can range from several thousand to tens of millions. According to the ionization of PAM in aqueous solution, it can be divided into nonionic (NonionicPolyacylamide, NPAM), anionic (Anionic Polyacrylamide, APAM), cationic (CationicPolyacry...

Claims

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Application Information

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