Polyacrylic acid or copolymer thereof and preparation method of polyacrylate or copolymer salt thereof

Abstract

The invention relates to a preparation method of an organic polymer and in particular discloses a preparation method of polyacrylic acid or a copolymer thereof. The method comprises the following steps: firstly preparing 3-62% of acrylic acid or methacrylic acid, 0-48% of comonomers, 0.05-35% of sodium hypophosphite and 30-96% of water; mixing the prepared raw materials all together and stirring the mixture uniformly, placing the mixture in a 60Co gamma ray radiation field to undergo radiation-induced polymerization, with radiation dose of 1.2-30KGy and obtaining the polyacrylic acid or the copolymer thereof after polymerization; and neutralizing the prepared polyacrylic acid or the copolymer thereof in aqueous alkali until the pH value is 6.5-9, thus obtaining polyacrylate or copolymer salt thereof. The invention has the following advantages: the energy consumption is low, the equipment utilization ratio is high, the process is simple and the operation is convenient, chemical initiators are avoided, the product performance is excellent, the production safety and environment-friendliness are better and the product can serve as a dispersing agent, a scale inhibitor, a thickening agent, a flocculating agent, etc.

Description

Technical field [0001] The present invention involves a preparation method for organic polymers, especially a method that uses carbon-carbon unsaturated keys and inorganic ingredients as raw materials to prepare organic polymers and its salt. Background technique [0002] At present, relevant literature in China has reported the synthesis and application of water -soluble (methyl) acrylic acid or its cluster.The preparation methods that have been used in existing technologies are to cause aggregation under chemical causes, and the general starting temperature is above 25 ° C when the aggregation is implemented.Discovering agent peroxide, therefore, there are disadvantages of poor production safety, and the purity of the product is relatively low, and the process is more complicated. [0003] CN200810143886.X China Patent disclosed a preparation method of polyacryonic acid or sodium polyacrynal. CN200810143887.4 China Patent disclosed a method of preparation of polyacrylic acid-2-...

AI Technical Summary

Problems solved by technology

The preparation method that has been used in the prior art is to initiate polymerization under a chemical initiator, and when the polymerization is carried out, the general initial temperature is above 25°C, and mostly adopts multiple feeds or dropping monomers to gradually react; Initiator peroxide, so there are disadvantages of poor production safety, and the purity of the obtained product is relatively low, and the process is more complicated

[0003] Chinese patent CN200810143886.X discloses a preparation method of polyacrylic acid or sodium polyacrylate, Chinese patent CN200810143887.4 discloses a polyacrylic acid-2- The preparation method of acrylamide-2-methylpropanesulfonic acid, the two preparation methods are one-time feeding and polymerization; CN00100399.2 Chinese patent discloses a composite corrosion and scale inhibitor for treating circulating cooling water , CN200610137772.5 Chinese patent discloses a scale inhibitor and its application in water treatment, CN200410066828.3 Chinese patent discloses a corrosion and scale inhibitor for industrial cooling water systems, CN200510023243.8 Chinese patent discloses a phosphorus-free water scale inhibitor, CN92111424.9 Chinese patent discloses the preparation of a low-molecular-weight water-soluble polymer, and CN200610098170.3 Chinese patent discloses a low-molecular-weight sodium polyacrylate as a paper-making dispersant No. CN95111773.4 Chinese patent discloses a phosphorus-containing terpolymer water scale inhibitor. These patents are all polymerized by batch feeding or gradually adding monomers; US4301266 US patent It also discloses a preparation method of poly(meth)acrylic acid or its copolymer, which requires high temperature (greater than 120°C) and high pressure during the reaction process, harsh reaction conditions, and excess isopropanol needs to be distilled off in the later process , the process consumes energy and is cumbersome; US Patent No. 4314044 also discloses a preparation process using metal salts (such as Cu2+) as an initiating system, and the reaction conditions of this process also need to meet relatively High temperature (greater than 90°C), and it needs to be completed under the condition of continuous feeding, which consumes energy and is cumbersome, and Cu2+ is easy to cause environmental pollution

In addition, in addition to the above-mentioned patent documents, there are other non-patent literature reports on the preparation methods of poly(meth)acrylic acid or its copolymers and their salts, but the existing preparation methods all use chemical initiation system peroxidation Substances (such as hydrogen peroxide, ammonium persulfate, potassium persulfate, etc.) and other reducing substances (such as sulfite, thiosulfate, ferrous salt, etc.), and the initial reaction temperature is above 25°C

[0004] In addition, the product obtained by the existing preparation method is a solid cross-linked product, which cannot be dissolved in water. Most of this cross-linked product is used as a water-absorbing or moisturizing material, and cannot Used as pesticide dispersant, paint dispersant, printing and dyeing dispersant, water treatment scale and corrosion inhibitor, ceramic water-reducing dispersant, ion chelating agent, etc.