Phosphorus-free water treatment agent, and preparation method and application thereof
A technology of water treatment agent and treatment cycle, applied in water/sludge/sewage treatment, chemical instruments and methods, descaling and water softening, etc. High-level problems, to achieve good flocculation effect, good scale and corrosion inhibition effect
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[0018] The method for preparing a phosphorus-free water treatment agent provided by the present invention comprises: mixing monomers, initiators and molecular weight regulators at 50-95°C, and then continuing at 75-95°C (preferably 85-95°C) Reaction 1-4h, the monomer is dimethyl diallyl ammonium chloride and unsaturated carboxylic acid, wherein, the unsaturated carboxylic acid is acrylic acid, maleic acid, methacrylic acid and methylene butane di One or more of the acids; the mixing method is:
[0019] (a) the solution of the monomer and the solution of the initiator are respectively added dropwise to the solution of the molecular weight regulator, or
[0020] (b) adding dropwise the solution of the monomer and the solution of the molecular weight regulator into the solution of the initiator respectively, or
[0021] (c) The solution of the initiator is added dropwise to the mixed solution of the molecular weight regulator and the monomer.
[0022] Preferably, the weight rat...
Embodiment 1
[0043] Add 1.2 g of sodium metabisulfite and 40 ml of water into a four-neck flask equipped with a stirrer, reflux condenser, constant pressure dropping funnel and thermometer, and start stirring to fully dissolve the sodium metabisulfite. Add 33.3g of dimethyl diallyl ammonium chloride, 40g of maleic anhydride and 10ml of water in a constant pressure dropping funnel, shake well; add 6g of ammonium persulfate and 60ml of water in another constant pressure dropping funnel , shake well; start to heat up, when the temperature rises to 50°C, start to drop the liquid in the two constant-pressure dropping funnels, while continuing to raise the temperature to 80°C, control the dropping speed so that the two constant-pressure dropping funnels The liquid in the solution was added dropwise within 1 hour, and then the heat preservation reaction was continued for 2 hours, the test was stopped, and the product was cooled to obtain a product with a solid content of 29.4%.
Embodiment 2
[0045] Add 2.4 g of sodium metabisulfite and 40 ml of water into a four-necked flask equipped with a stirrer, a reflux condenser, a constant pressure dropping funnel, and a thermometer, and start stirring to fully dissolve the sodium metabisulfite. Add 50g of dimethyl diallyl ammonium chloride, 30g of methacrylic acid and 10ml of water in a constant pressure dropping funnel, shake well; add 7.2g of potassium persulfate and 60ml of water in another constant pressure dropping funnel , shake well; start to heat up, when the temperature rises to 60°C, start to drop the liquid in the two constant pressure dropping funnels, while continuing to raise the temperature to 75°C, control the dropping speed so that the two constant pressure dropping funnels The liquid in the solution was added dropwise within 1.5 hours, and then the heat preservation reaction was continued for 2 hours, the test was stopped, and the product was cooled to obtain a product with a solid content of 30.1%.
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