Use | allyl monomers (including allyl alcohol and Allyl acetate) and maleic acid (or anhydride) co-extractions have a very significant effect on inhibiting the formation and deposition of calcium phosphate, calcium sulfate, calcium carbonate and other polyvalent metal carbonates, phosphates and sulfates scale in industrial cooling water systems. It can also be used in water systems such as boilers, heat exchangers, etc. to prevent scale formation and deposition on heated surfaces. Because the product does not contain phosphorus, it has no pollution to the water area. As the phosphorus (phosphine) salt release agent is used in combination, there is a synergistic effect and the dosage of the phosphorus-based agent can be reduced. 1-25ppm of the product can inhibit the pH value in the range of 7-12 cooling water, boiler water and other systems in the calcium salt and other polyvalent metal salts. |
production method | There are roughly two production routes. The first is in the initiator (such as azobisisobutyronitrile, sodium persulfate-benzoyl peroxide, etc.) in the presence of a certain proportion of maleic acid and allyl alcohol in water or organic solvent, in 70-130 ℃ temperature copolymerization, the product was obtained. In order to increase its water solubility, the resulting copolymer is usually converted into a salt, and the monomer may be converted into a salt before copolymerization. In order to improve the quality of the product, the residual monomer can be separated from the obtained product, and then separated and refined with water or organic solvent. The second is the copolymerization of maleic anhydride and Allyl acetate, which can obtain the same performance products. With dioxane as the solvent, a certain proportion of Allyl acetate and maleic anhydride are dissolved therein. After one hour of nitrogen aeration, benzoyl peroxide was added to the above solution, and the nitrogen was refluxed for 15min, and then refluxed under the protection of nitrogen for 1H to obtain the product. During the Reflux reaction, in order to prevent precipitation of the produced copolymer, water should be slowly added while controlling the reaction temperature at 80 ° C., and the amount of water should be added so that the concentration of the copolymer is maintained at 10%. |