Method for preparing cationic polyvinyl alcohol paper intensifier

A paper strengthening agent, polyvinyl alcohol technology, applied in the direction of strengthening agent addition, can solve the problem of limiting formaldehyde, etc., to achieve the effect of improving paper strength, tight connection, and eliminating hazards

Inactive Publication Date: 2008-07-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, formaldehyde is a type of monomer that is extremely harmful to the human body. In recent years, the application of formaldehyde has been restricted in various fields at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: First, add polyvinyl alcohol (0588) and deionized water into a dry reactor at a mass ratio of 5:100, heat to 90°C, and keep warm for 1-3 hours to completely dissolve the polyvinyl alcohol in the reactor Afterwards, the temperature was lowered to 65° C. to obtain polyvinyl alcohol aqueous solution A; then solution A and cationic etherification agent 3-chloro-2-hydroxypropyltrimethylammonium chloride were uniformly mixed in a mass ratio of 100:25, and then used Adjust the pH value of the system to 10 with ammonia water, and react at 60°C for 1-3 hours to prepare cationic polyvinyl alcohol solution B; adjust the pH of cationic polyvinyl alcohol solution B to 4 with hydrochloric acid, and react at 70°C for 0.5-3 hours Cationic cross-linked modified polyvinyl alcohol solution C is prepared; ammonia water is added to the solution C to adjust the pH value of the system to 7, and the cationic polyvinyl alcohol paper strengthening agent can be obtained.

Embodiment 2

[0008] Example 2: First, polyvinyl alcohol (1099) and deionized water are added to a drying reactor at a mass ratio of 8:100, heated to 97°C, and kept warm for 1-3 hours to completely dissolve the polyvinyl alcohol in the reactor Afterwards, lower the temperature to 63°C to obtain polyvinyl alcohol aqueous solution A; then mix the solution A and the cationic etherifying agent 2,3-epoxypropyltrimethylammonium chloride in a mass ratio of 100:40, and then use hydrogen Sodium oxide adjusts the pH value of the system to 9, and reacts at 53°C for 1-3 hours to obtain a cationic polyvinyl alcohol solution B; after mixing the polymerized cross-linking monomer glyoxal and the solution B at a mass ratio of 10:100, Use glacial acetic acid to adjust the pH of the system to 3, and react at 80°C for 0.5-3 hours to obtain a cationic cross-linked modified polyvinyl alcohol solution C; add sodium hydroxide to the solution C to adjust the pH of the system to 5, and then Cationic polyvinyl alcoho...

Embodiment 3

[0009] Example 3: First, polyvinyl alcohol (1750) and deionized water are added to a dry reactor at a mass ratio of 12:100, heated to 83°C, and kept warm for 1-3 hours to completely dissolve the polyvinyl alcohol in the reactor After that, the temperature was lowered to 58°C to obtain polyvinyl alcohol aqueous solution A; then solution A and cationic etherification agent (3-chloro-2-hydroxypropyltrimethylammonium Ammonium chloride mixture) was uniformly mixed at a mass ratio of 100:15, adjusted the pH value of the system to 8 with potassium hydroxide, and reacted at 65° C. for 1-3 hours to obtain cationized polyvinyl alcohol solution B; Combined monomer glutaraldehyde and solution B are uniformly mixed in a mass ratio of 30:100, then adjust the pH of the system to 2 with formic acid, and react at 60°C for 0.5-3 hours to prepare cationized cross-linked modified polyvinyl alcohol solution C ; After adding potassium hydroxide to the solution C to adjust the pH value of the system...

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PUM

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Abstract

The invention discloses a process for preparing cation polyvinyl alcohol paper reinforcing agent, which comprises: firstly charging solid particles of polyvinyl alcohol and deionized water into a reactor, heating the reactor to a certain temperature and keeping the temperature till the polyvinyl alcohol is totally melt in the reactor, cooling the reactor and charging cation etherifying agent to cationise the polyvinyl alcohol; finally charging polymer crosslinking monomer into the cation polyvinyl alcohol solution and adjusting the solution pH value to acidity and then after keeping the temperature of the solution for a while, adjusting the pH value to weak acidity to obtain transparent liquid. The invention ensures that the discharged substance contains no organic halide and formaldehyde, and the retention rate of the crosslinking product after being ionized and modified is greatly improved. The reinforcing agent of the invention not only improves paper dry and wet strength, but also improves the paper folding endurance, and if the reinforcing agent is coated on paper surface, paper surface strength can be greatly improved. Meanwhile, the process of the invention has simple process and low cost of materials and can widen the polyvinyl alcohol application range.

Description

technical field [0001] The invention belongs to the field of preparation technology of fine chemicals, in particular to a preparation method of a cationic polyvinyl alcohol paper strengthening agent. Background technique [0002] Polyvinyl alcohol is a widely used water-soluble polymer, non-toxic and harmless, due to its excellent adhesion, smoothness, oil resistance, solvent resistance, gas barrier properties, wear resistance, protective colloid and other characteristics And be widely used. It is also resistant to mineral oils, greases, lubricants and most organic solvents. But because it is non-ionic, if it is directly added to the slurry, the retention rate is very low, and the expected application effect cannot be achieved. After the condensation of polyvinyl alcohol and formaldehyde, it has excellent film-forming properties, and the mechanical strength, oil resistance, solvent resistance, and water resistance of the film have been greatly improved, and it has been wid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/18
Inventor 费贵强沈一丁王海花李小瑞李刚辉
Owner SHAANXI UNIV OF SCI & TECH
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