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Preparation method of high-molecular-weight hydrophobic cationic polyacrylamide

A polyacrylamide and cationic technology, which is applied in the field of preparation of high molecular weight hydrophobic cationic polyacrylamide, can solve the problems of poor solubility, poor solubility, low molecular weight, etc., achieve stable polymerization reaction, fast dissolution speed, and use convenient effect

Active Publication Date: 2015-04-22
CHANGZHOU KEWEI TIANSHI ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the polyacrylamide prepared by the current preparation method still has low molecular weight, poor solubility or inconspicuous flocculation effect, etc.
For example, some products have good solubility, but the molecular weight is lower than 10 million; while some products have a molecular weight higher than 10 million, but the solubility is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0020] The preparation method of the high molecular weight hydrophobic cationic polyacrylamide of the present embodiment comprises the following steps:

[0021] ①Weighing monomers including acrylamide (CAS NO.79-06-1), acryloyloxyethyltrimethylammonium chloride (CAS NO.46830-22-2) and octadecyl acrylate (CAS NO.4813 -57-4) For standby, the ratio of the amount of the above three monomers is (47~189.5): (10~50): (0.5~3); the sum of the mass of the above three monomers is recorded as the unit total body weight.

[0022] In this example, 37.7g (0.53mol) of acrylamide, 11.3g (0.059mol) of acryloyloxyethyltrimethylammonium chloride and 0.9g (0.0028mol) of octadecyl acrylate were weighed for use; the above three monomers The ratio of the amount of substances is 189:21:1.

[0023] ②Put the acrylamide and acryloyloxyethyltrimethylammonium chloride weighed in step ① into the reaction vessel with a water bath in sequence, and control the temperature of the water bath at 5°C to 10°C (in...

Embodiment 2）

[0032]All the other preparation methods of the present embodiment are the same as in Example 1, except that:

[0033] In step ①, weigh 42.9g (0.60mol) of acrylamide, 29.6g (0.15mol) of acryloyloxyethyltrimethylammonium chloride and 2.5g (0.0077mol) of stearyl acrylate for later use.

[0034] In step ②, add 225 g of deionized water into the reaction vessel, stir at a stirring speed of 54 rpm, and stir for 12 minutes.

[0035] In step ③, the amount of cetyltrimethylammonium bromide added is 2.25 g, and the stirring speed is 85 rpm.

[0036] The stirring speed in step ④ is 122 rpm, stirring for 18 minutes.

[0037] Step 5. The addition of urea is 0.12g, the addition of dimethylaminoethyl methacrylate is 0.03g; the stirring speed is 122 rpm.

[0038] Step 6. the add-on of ammonium persulfate is 0.045g, the add-on of sodium bisulfite is 0.015g, and the add-on of 2,2'-azo (2-amidinopropane) dihydrochloride is 0.015g.

Embodiment 3）

[0040] All the other preparation methods of the present embodiment are the same as in Example 1, except that:

[0041] In step ①, weigh 73.9g (1.03mol) of acrylamide, 36.9g (0.19mol) of acryloyloxyethyltrimethylammonium chloride and 4.2g (0.013mol) of octadecyl acrylate for later use.

[0042] In step ②, add 385 g of deionized water into the reaction vessel, and the stirring speed is 60 rpm.

[0043] In step ③, the amount of cetyltrimethylammonium bromide added is 2.3 g, and the stirring speed is 90 rpm.

[0044] The stirring speed in step ④ is 125 rpm, stirring for 20 minutes.

[0045] The add-on of urea in step ⑤ is 0.086g, the add-on of dimethylaminoethyl methacrylate is 0.029g; Stirring speed is 125 rpm.

[0046] Step 6. the add-on of ammonium persulfate is 0.069g, the add-on of sodium bisulfite is 0.023g, and the add-on of 2,2'-azo (2-amidinopropane) dihydrochloride is 0.023g.

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PUM

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Abstract

The invention discloses a preparation method of high-molecular-weight hydrophobic cationic polyacrylamide, which comprises the following steps: weighing monomers, including acrylamide, acryloyloxyethyl trimethyl ammonium chloride and octadecyl acrylate, for later use, sequentially adding acrylamide, acryloyloxyethyl trimethyl ammonium chloride, deionized water, cationic surfactant, octadecyl acrylate and reaction aid into a reaction vessel, and respectively stirring after adding each group of materials; adding a reaction initiator, stirring until the material in the reaction vessel becomes sticky, and stopping introducing high-purity nitrogen gas while stopping stirring; and after the reaction finishes, keeping the temperature, taking out an adhesive block, granulating, drying, pulverizing and screening to obtain the granular product. The compound initiation system used by the preparation method stabilizes the polymerization reaction, and is beneficial to chain growth, thereby obtaining the high-molecular-weight cationic polyacrylamide.

Description

technical field [0001] The invention relates to a preparation method of cationic polyacrylamide, in particular to a preparation method of high molecular weight hydrophobic cationic polyacrylamide. Background technique [0002] Polyacrylamide (PAM) is a widely used water-soluble polymer compound. It is a general term for acrylamide homopolymers and various copolymers, including non-ionic, anionic, cationic and zwitterionic. Liquid, colloidal, dry powder and other physical forms appear. According to the needs of the application, the researchers introduced various functional monomers into the polymer chain segment to prepare polyacrylamide with different functions. Hydrophobic modified cationic polyacrylamide (hereinafter referred to as hydrophobic cationic polyacrylamide) is also one of the more researched functional polyacrylamides. [0003] Hydrophobic cationic polyacrylamide is copolymerized with acrylamide and cationic monomers with certain hydrophobic ability. Cationic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/34C08F220/18C08F4/04C08F4/40
Inventor 侯群锋姚科
Owner CHANGZHOU KEWEI TIANSHI ENVIRONMENTAL TECH