Method of preparing cationic polyacrylamide paper making intensifier

A technology of polyacrylamide and paper-making strengthening agent, which is applied in the direction of strengthening agent addition, which can solve the problems of poor water solubility, pollution, production cost, and poor fluidity of the product, and achieve good solubility, improved uniformity, and reduced system viscosity.

Inactive Publication Date: 2009-12-16
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a large amount of organic solvents are used, there are problems such as pollution and production costs, and the water solubility of the product is relatively poor, so it is very difficult to use
Cationic paper strengthening agents currently on the market are usually about 10% aqueous solution, with low solid content, fast degradation and poor fluidity

Method used

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  • Method of preparing cationic polyacrylamide paper making intensifier
  • Method of preparing cationic polyacrylamide paper making intensifier
  • Method of preparing cationic polyacrylamide paper making intensifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1, first, the acrylamide monomer was mixed with polyethylene oxide with a relative molecular mass of 20,000 in a mass ratio of 1:0.5, then water was added to make the content of the acrylamide monomer 18%, and then the mass of the acrylamide monomer was added. 15% of the cationic monomer dimethylamine ethyl methacrylate and 8% of potassium persulfate can be polymerized at 80° C. for 4 hours.

[0016] The conversion rate of the product was measured by the potassium bromate potassium bromide method, and the conversion rate exceeded 98%. The viscosity was measured by a rotor viscometer, and the viscosity was 5Pa·s, which was far less than the general aqueous solution polymerization.

[0017] At the same time, the solubility of the product was tested, adding 2 g of the polymer emulsion to 100 g of water, stirring gently, and quickly dissolving into a transparent solution. However, with the same amount of cationic acrylamide, it takes more than 1 hour to dissolve com...

Embodiment 2

[0018] Example 2: First, mix acrylamide monomer and polyethylene oxide with a relative molecular mass of 50,000 in a mass ratio of 1:1.2, then add water to make the content of acrylamide monomer 23%, and then add the mass of acrylamide monomer 20% of the cationic monomer dimethyl diallyl ammonium chloride and 5% of sodium persulfate can be polymerized at 80°C for 6 hours.

[0019] The conversion rate of the product was measured by the potassium bromate potassium bromide method, and the conversion rate exceeded 97%. The viscosity was measured by a rotor viscometer, and the viscosity was 5.8Pa·s.

[0020] At the same time, the solubility of the product was tested, adding 2 g of the polymer emulsion to 100 g of water, stirring gently, and quickly dissolving into a transparent solution.

Embodiment 3

[0021] Example 3: First, mix acrylamide monomer and polyethylene oxide with a relative molecular mass of 10,000 in a mass ratio of 1:1.7, then add water to make the content of acrylamide monomer 10%, and then add the mass of acrylamide monomer. 30% of the cationic monomer acryloylethyltrimethylbenzyl ammonium chloride and 3% of ammonium persulfate can be polymerized at 70° C. for 7.5 hours.

[0022] The conversion rate of the product was measured by the potassium bromate potassium bromide method, and the conversion rate exceeded 98%. The viscosity was measured by a rotor viscometer, and the viscosity was 7Pa·s.

[0023] At the same time, the solubility of the product was tested, adding 2 g of the polymer emulsion to 100 g of water, stirring gently, and quickly dissolving into a transparent solution.

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Abstract

The preparation method of the cationic polyacrylamide paper-making strengthening agent comprises firstly mixing the acrylamide monomer and polyethylene oxide, and then adding water, cationic monomer and water-soluble initiator to carry out polymerization reaction. Since the present invention dissolves the copolymer of acrylamide monomer and cationic monomer in the polyethylene oxide solution, the system undergoes phase separation through the interaction between the polymer and the dispersion medium, thereby increasing the molecular weight and solid content of the polymer and reducing the viscosity of the system. At the same time, polyacrylamide copolymer also has good solubility and can be quickly dissolved in water. Polyethylene oxide also has a good dispersion effect on paper-making fibers. Adding polyoxyethylene can improve the uniformity of paper production, and polyacrylamide copolymer Together, they can improve the strength of fiber paper.

Description

technical field [0001] The invention belongs to a synthesis method of a paper strengthening agent, in particular to a preparation method of a cationic polyacrylamide papermaking strengthening agent. Background technique [0002] Polyacrylamide can be prepared by free radical aqueous solution polymerization, inverse emulsion polymerization, precipitation polymerization, etc. This type of polymer is widely used in water treatment, papermaking and other industries that require products with low viscosity and good solubility. [0003] The aqueous solution polymerization process is simple, the polymerization yield is high, and the environmental pollution is less, and it is the preferred method for preparing cationic polyacrylamide. It can control the polymer reaction process and product properties by adjusting the initiation system, medium PH value, additives, temperature, etc. Although aqueous solution polymerization has many advantages, it also has many disadvantages, and it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/55D21H21/18
Inventor 张光华王义伟朱军峰吴桂霞来智超
Owner SHAANXI UNIV OF SCI & TECH
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