Dispersant for calcium carbonate and manufacturing method thereof
A manufacturing method and technology of calcium carbonate, applied in chemical instruments and methods, papermaking, textiles and papermaking, etc., can solve the problems of high viscosity and rising viscosity of calcium carbonate slurry, and achieve low initial viscosity, excellent dispersibility, and dispersibility. excellent effect
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Embodiment 1-1
[0130] Example 1-1 (Preparation of Dispersant 1-1 and Preparation of Slurry Using Dispersant 1-1)
[0131] Into a flask equipped with a stirrer and a condenser, 500 g of an aqueous solution having a concentration of 36% of isopropanol (hereinafter also abbreviated as "IPA") was charged, and the temperature was maintained at 80°C. Next, a mixture of 600 g of acrylic acid (hereinafter also referred to simply as "AA"), 20 g of sodium hypophosphite, and 270 g of an aqueous solution having an IPA concentration of 36% and a 15% aqueous solution of sodium persulfate were supplied dropwise to the flask over 4 hours. 40g to react (polymerize). Furthermore, after completion|finish of dripping, the reaction liquid was hold|maintained at 80 degreeC for 1 hour, and it reacted (polymerized). Next, IPA was distilled off under reduced pressure while injecting deionized water into the obtained reaction liquid until the IPA concentration became 1000 mass ppm or less. Next, the reaction liquid...
Embodiment 1-2
[0135] Example 1-2 (Preparation of Dispersant 1-2 and Preparation of Slurry Using Dispersant 1-2)
[0136] In Example 1-2, the dispersant 1-2 was prepared by using the distilled and recovered IPA aqueous solution during the preparation of the dispersant 1-1 in the above-mentioned Example 1-1.
[0137] The concentration of the IPA aqueous solution recovered in the above-mentioned Example 1-1 was measured, and the result was that the IPA concentration was 40%. In order to make the recovered IPA aqueous solution have the same concentration as the IPA aqueous solution used in Example 1-1, deionized water was added to adjust to an aqueous solution having an IPA concentration of 36%. Then, except using this concentration-adjusted IPA aqueous solution, polymerization, vacuum distillation, and neutralization were carried out in the same manner as in Example 1-1 to obtain acrylic polymer 1-2 with a solid content concentration of 40% and Dispersant 1-2 at pH 4.
[0138] Then, using th...
Embodiment 2-1
[0139] Example 2-1 (Preparation of Dispersant 2-1 and Preparation of Slurry Using Dispersant 2-1)
[0140] Except that the aqueous solution with an IPA concentration of 36% in Example 1-1 was replaced with an aqueous solution with an IPA concentration of 48%, the polymerization, decompression distillation and neutralization were performed in the same manner as in Example 1-1 to obtain a Dispersant 2-1 based on polymer 2-1, with a solid content concentration of 40% and a pH of 4.
[0141] Then, using the obtained dispersant 2-1, a ground calcium carbonate slurry was obtained in the same manner as in Example 1-1.
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Abstract
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