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
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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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