Polyacrylic acid thickener taking modified attapulgite as cross-linking agent and preparation method of polyacrylic acid thickener
A technology of polyacrylic acid and cross-linking agent, which is applied in the direction of coating, etc., can solve the problems of application limitation, poor electrolyte resistance, etc., and achieve the effect of reducing production cost, high paste rate, and good cross-linking effect
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[0026] Example 1
[0027] (1) Place the attapulgite in a 2mol / L nitric acid solution, sonicate it at 70°C for 60 minutes, wash it with water until it is neutral, centrifuge it, dry, and grind it through a 400-mesh sieve for use;
[0028] (2) Take 10g of the attapulgite treated in step (1), disperse it in toluene with a solid-liquid mass ratio of 1:10, ultrasonically disperse for 10 minutes, and add the silane coupling agent γ-aminopropyltriethoxysilane dropwise , The mass ratio of silane coupling agent to attapulgite is 5:1, adjust the pH of the system to 4.0 with glacial acetic acid, stir at room temperature for 48h, after the reaction, remove the solvent, vacuum dry, and grind through a 400 mesh sieve to obtain silane coupling Coupling agent modified attapulgite;
[0029] (3) Disperse 1 part (by weight) of the above-mentioned silane coupling agent modified organic attapulgite in 10 parts (by volume) of methanol solution, add dropwise acrylate, acrylate and acrylate with stirring a...
Example Embodiment
[0033] Example 2
[0034] (1) Place the attapulgite in a 2mol / L nitric acid solution, sonicate it at 80°C for 30 minutes, wash it with water to neutrality, centrifuge it, dry, and grind it through a 400 mesh sieve for use;
[0035] (2) Take 10g of the attapulgite treated in step (1), disperse it in xylene with a solid-liquid mass ratio of 1:30, ultrasonically disperse for 30 minutes, and add the silane coupling agent γ-aminopropyltrimethoxysilane dropwise , The mass ratio of silane coupling agent to attapulgite is 8:1, the pH value of the system is adjusted to 5.0 with glacial acetic acid, and the system is stirred for 96h at room temperature. After the reaction is completed, the solvent is removed, dried in vacuum, and ground through a 400 mesh sieve to obtain silane coupling Coupling agent modified attapulgite;
[0036] (3) Disperse 1 part (by weight) of the above-mentioned silane coupling agent modified organic attapulgite in 25 parts (by volume) of methanol solution, add dropwis...
Example Embodiment
[0040] Example 3
[0041] (1) Place the attapulgite in a 2mol / L nitric acid solution, sonicate at 75°C for 45 minutes, wash with water to neutral, centrifuge, dry, grind through a 400 mesh sieve, and set aside;
[0042] (2) Take 10g of the attapulgite treated in step (1), disperse it in toluene with a solid-liquid mass ratio of 1:20, ultrasonically disperse for 20 minutes, and add dropwise the silane coupling agent N-(β-aminoethyl)- γ-Aminopropyltrimethoxysilane, the mass ratio of silane coupling agent to attapulgite is 6:1, adjust the pH value of the system to 4.5 with glacial acetic acid, stir at room temperature for 72h, after the reaction, remove the solvent, vacuum dry, Grind through a 400-mesh sieve to obtain silane coupling agent modified attapulgite;
[0043] (3) Disperse 1 part (by weight) of the above-mentioned silane coupling agent modified organic attapulgite in 15 parts (by volume) of methanol solution, add dropwise acrylate, acrylate and acrylate with stirring at 50°C ...
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