Method for preparing polyacrylate-2-acrylamide-2-methyl propane sulfonic acid

Abstract

The invention discloses a method for preparing polyacrylic acid-2-acrylamide-2-methyl propanesulfonic acid. The method mainly comprises the following steps: 5 to 30 mass percent of crylic acid, 1 to 15 mass percent of 2-acrylamide-2-methyl propanesulfonic acid, 0.5 to 6 mass percent of persulfate, 0.2 to 3 mass percent of sodium sulfite, 0.05 to 3 mass percent of L-ascorbic acid, 0.5 to 9 mass percent of ethanol, 0.5 to 3 mass percent of dodecyl mercaptan and 50 to 85 mass percent of water are mixed to have polymerization reaction for not less than one hour at a temperature of between 35 and 60 DEG C to obtain the polyacrylic acid-2-acrylamide-2-methyl propanesulfonic acid. The method has the advantages the polyacrylic acid-2-acrylamide-2-methyl propanesulfonic acid with low molecular weight is synthesized once, has low starting reaction temperature, less energy consumption, rapid reaction speed, high utilization efficiency of equipment, a simple process and convenient operation.

Description

technical field [0001] The invention relates to a method for preparing organic polymers, in particular to a method for preparing organic polymers by using carbon-carbon unsaturated bonds and inorganic ingredients as raw materials. Background technique [0002] At present, relevant literatures in China have reported the method of using low-molecular-weight polyacrylic acid-2-acrylamide-2-methylpropanesulfonic acid as one of the components to compound the production of scale inhibitors, scale removers or corrosion inhibitors, but there is no The invention relates to a low-molecular-weight polyacrylic acid-2-acrylamide-2-methylpropanesulfonic acid low-temperature initiation and one-time feed preparation method. The preparation methods that have been used in the prior art mostly carry out polymerization at a higher initial temperature, and generally adopt the method of feeding multiple times or gradually adding monomers and initiators to control the polymerization reaction speed...

AI Technical Summary

Problems solved by technology

Domestic patent document CN1654369A discloses a method for preparing water scale inhibitors using acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, etc. as monomers, but this initiation system needs to generate free radicals to initiate polymerization at a higher temperature , the reaction rate is relatively slow

Domestic patent document CN1235818C discloses ternary copolymerization with 2-acrylamide-2-methylpropanesulfonic acid as comonomer, but the initial temperature of the polymerization reaction is high, consumes energy, and needs to add initiator while reacting And monomer, complex process, long reaction time, low equipment efficiency

Existing method for preparing the binary or multiple low molecular weight copolymers of acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid mainly includes following several kinds: adopt isopropanol as molecular weight regulator (for example U.S. Patent US4301266,1981, BASF A.-G.Muenster, A.and Rohmann, M), this method needs high temperature (greater than 120 ℃) ​​high pressure in the reaction process, the reaction condition is harsh, and needs to distill out excess isopropanol in the later operation, this process Energy-consuming and cumbersome procedures; using metal salts (such as Cu 2+ ) as an initiating system (such as U.S. Patent US4314044, 1982, Rohm and Haas Co, Hughes, K.A, Kine, B.B. and Swift, G.), the reaction conditions of this process also need to meet higher temperature (greater than 90 ° C), and need It is completed in the case of continuous feeding, which consumes energy and is cumbersome, while Cu 2+ easy to cause environmental pollution