Acrylate polymer and its prepn and use
A technology of acrylic polymers and acrylates, which is applied in the field of acrylic polymers and can solve problems such as unsatisfactory improvement effects
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[0022] The preparation method of the acrylic acid (salt) polymer of the present invention is to polymerize monomer components containing acrylic acid (salt). It is important that at least part, that is, a part or all of the aforementioned acrylic acid (salt) as the aforementioned monomer component is an acrylic acid (salt) containing 200 to 400 wt. In this way, without being limited by production equipment and operation, acrylic acid (salt) polymers with low molecular weight and narrow molecular weight distribution that can exhibit good dispersibility or high molecular weight can be produced by conventionally known methods. Acrylic acid (salt) copolymer with high solubility in water. In addition, since the crude acrylic acid (salt) produced by gas-phase oxidation of propylene or acrolein generally contains 200 to 400 ppm by weight of furfural, the present invention can use the crude acrylic acid (salt) as it is. If the ratio of the aforementioned acrylic acid (salt) to all mo...
Embodiment 1-1
[0048] Into a 1-liter flask equipped with a thermometer, a nitrogen inlet tube, and a stirrer, 973 g of a 37% by weight aqueous solution of sodium acrylate containing 300 wt. ppm furfural and 300 wt. ppm benzaldehyde and 17 g of ion-exchanged water were charged. After cooling to 10±2°C in an ice bath, nitrogen gas was blown in to remove dissolved oxygen in the aqueous solution to reduce the dissolved oxygen concentration to below 0.3ppm. Then, 0.013% by weight of ammonium persulfate was added to this aqueous solution corresponding to the above-mentioned added monomers, and ion-exchanged water was added thereto to make the total amount 1000 g. After the aqueous solution was stirred for 10 minutes, the stirring was stopped, and the solution was immersed in a constant temperature bath at 35° C. to start the polymerization reaction. 20 minutes after the start of the polymerization, the aqueous solution began to gel in a cloudy state, and 90 minutes after this phenomenon occurred, ...
Embodiment 1-2 and comparative example 1-1
[0057] Except that the amount of furfural contained in the sodium acrylate in Example 1-1 was changed as shown in Table 1, the others were the same as in Example 1-1 to obtain dry powder of acrylic acid (salt) polymer. Table 1 shows the measured maximum temperature arrival time, maximum temperature, weight-average molecular weight and water-insoluble components measured in the same manner as in Example 1-1.
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