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Preparation method of instant ultra-high molecular weight polyacrylamide dry powder

An ultra-high molecular weight, polyacrylamide technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of decreased polymerization degree, difficult to initiate polymerization, and decreased initial polymerization temperature.

Inactive Publication Date: 2013-09-18
SHANGHAI YUKING WATER SOLUBLE MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In some existing traditional polymerization initiation systems, the reaction activity of the initiation system used is low, and it is difficult to initiate polymerization at low temperature. When the temperature rises, the polymerization can be initiated, but the polymerization rate increases significantly with the increase of temperature, and the degree of polymerization increases with the increase of temperature. This kind of high-temperature and strong initiator restricts the reduction of the initial temperature of polymerization, and the reaction speed is not easy to control during the reaction

Method used

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  • Preparation method of instant ultra-high molecular weight polyacrylamide dry powder
  • Preparation method of instant ultra-high molecular weight polyacrylamide dry powder
  • Preparation method of instant ultra-high molecular weight polyacrylamide dry powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Synthesize polyacrylamide with the method of the present invention in the laboratory, synthetic scale carries out step by step according to 1200g / still, 10Kg / still, 20Kg / still, 50Kg / still, each raw material specification and source are as shown in table 4.

[0071] 1. Instrument

[0072] Polymerization kettle, stirrer, high-pressure nitrogen cylinder, porous ceramics, analytical balance, constant temperature water bath, temperature recorder, oven, colloid mill, etc.

[0073] Table 4

[0074]

[0075] 2. Chemical reagents

[0076] Acrylamide AM (technical grade); Azotripropionamide, analytically pure; Potassium persulfate, analytically pure; Ammonia, chemically pure; Urea, chemically pure; Azobisisobutylamidine hydrochloride, analytically pure; Sulfuric acid, chemically pure ; Sodium hydroxide, chemically pure

[0077] 3. Experimental steps

[0078] (5) Preparation of mother liquor: Mix acrylamide and water into a 15% reaction mother liquor according to a cert...

Embodiment 2

[0087] Industrialized production, using adiabatic tank reactor polymerization, the synthesis scale is 8 tons / kettle

[0088] 1. Equipment

[0089] Dissolving tank (10 tons), polymerization kettle (10 tons), pre-grinding machine, temperature recorder, granulator, high-pressure nitrogen bottle, etc.

[0090] 2. Chemical reagents

[0091] Acrylamide AM (technical grade); Azotripropionamide, analytically pure; Potassium persulfate, analytically pure; Ammonia, chemically pure; Urea, chemically pure; Azobisisobutylamidine hydrochloride, analytically pure; Sulfuric acid, chemically pure ; Sodium hydroxide, chemically pure

[0092] 3. Experimental steps

[0093] (1) Prepare 20% acrylamide in a dissolving tank, add 0.15% ammonia water, stir evenly, and transfer to a reaction kettle after completion.

[0094](2) Blow nitrogen into the reactor for 1 hour, add 0.2% NTP after deoxygenation, K 2 S 2 o 8 0.35%, stop blowing nitrogen. The reaction was continued for 1 hour.

[0095] (...

Embodiment 3

[0100] Equipment, reaction reagents, and reaction steps are the same as in Example 2, and the weight proportions of monomers, initiators and auxiliary agents are shown in Table 7 below:

[0101] Table 7

[0102]

[0103] Note: The data of each substance in Table 7 is the percentage of the weight of each substance to the weight of the reaction monomer solution.

[0104] Obtain the final product instant ultra-high molecular weight PAM, and each index is shown in the following table 8:

[0105] Table 8

[0106]

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Abstract

The invention relates to a preparation method of instant ultra-high molecular weight polyacrylamide dry powder. The method comprises the following steps of: taking acrylic amide AM as a monomer, adopting a low-temperature composite initiation system taking NTP and K2S2O8 as main initiators, and an azo compound as an auxiliary initiator; adopting ammonia water and urea as cosolvents; and adding the initiator in batches and controlling the concentration of the cosolvent and the pH value of the medium, so as to obtain the instant ultra-high molecular weight polyacrylamide dry powder. The relative molecular weight range of the ultra-high molecular weight polyacrylamide PAM is that Mw is smaller than or equal to 25000000 and greater than or equal to 5000000. The optimal production technology is determined by discussing the influence factors such as the initiation system, the cosolvent concentration, and the pH value of the medium; the obtained polyacrylamide is rapidly dissolved, and is high in relative molecular weight, high in percent conversion, low in monomer content, high in production efficiency, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to the field of ultra-high molecular weight polymers, in particular to a method for preparing instant ultra-high molecular weight polyacrylamide dry powder. Background technique [0002] Polyacrylamide (PAM) is a linear high molecular polymer produced by free radical addition reaction of monomer acrylamide (AM). PAM is a white powder, easily soluble in water, insoluble in benzene, ether, acetone Such as general organic solvents, non-toxic, non-corrosive, solid PAM has hygroscopicity, is an important class of water-soluble polymers, has special physical and chemical properties, and is easy to obtain branched chains or networks by grafting or cross-linking Various modifications of the structure, PAM molecules can introduce various ionic groups to obtain specific properties, which are widely used in various fields such as chemical industry, metallurgy, geology, coal, petroleum, papermaking and water treatment, etc. " title. [0003...

Claims

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Application Information

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IPC IPC(8): C08F120/56C08F4/40C08F4/04C02F1/56
Inventor 王宇牟江涛陈占熊俊超
Owner SHANGHAI YUKING WATER SOLUBLE MATERIAL TECH
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