A method for preparing solid-type water-soluble polymers induced by ultraviolet light

Abstract

The invention discloses a method for preparing a solid water-soluble high molecular polymer induced by ultraviolet light, which comprises the following steps: adding deionized water, functional monomers, chelating agent, cosolvent, chain transfer agent / crosslinking agent, configured as a pre-polymerization solution; adjust the temperature and pH value of the pre-polymerization solution, and deoxidize the pre-polymerization solution through a packed tower; mix the deoxygenated pre-polymerization solution with an initiator to obtain a polymerization solution, and send the polymerization solution into The polymerization device carries out the polymerization reaction; the ultraviolet light intensity of the ultraviolet light triggering mechanism is gradually increased in the early stage of polymerization, the middle stage of polymerization, and the late stage of polymerization to control the speed of polymerization reaction. The invented method optimizes the polymerization method, controls the intensity of ultraviolet light and the temperature of the polymerization reaction in each reaction stage of the polymerization, so that the produced product has the characteristics of high molecular weight and low residue, and the product can be applied to water treatment, sludge dehydration, papermaking , Oil and gas mining, mineral washing and other fields.

Description

technical field [0001] The invention relates to a method for preparing a solid water-soluble high molecular polymer induced by ultraviolet light. Background technique [0002] At present, most solid-type water-soluble polymers are produced by kettle-type redox-initiated polymerization, which has the disadvantages of high energy consumption, long time, and inconvenient continuous production. Ultraviolet light-induced polymerization technology is a green and environmentally friendly polymerization technology, which has been well applied in the fields of biomedical materials and nanomaterials. In the field of water-soluble polymer preparation, the ultraviolet photoinitiation technology theoretically has the advantages of low energy consumption, short time, simple operation and continuous production. However, at present, in China, ultraviolet light-induced polymerization is mainly concentrated on the research level, and few of them involve industrial production, and there are t...

AI Technical Summary

Problems solved by technology

However, at present, in China, ultraviolet light-induced polymerization is mainly concentrated on the research level, and few of them involve industrial production, and there are the following deficiencies: 1. The use of ultraviolet light-induced polymerization does not use photoinitiators, resulting in high ultraviolet light intensity in the early stage of polymerization, such as Patent Publication No. CN107151289B "A Method for Preparing Cationic Polyacrylamide by Photoinitiation System", in which an azo initiator and a redox initiator are added, but no photoinitiator is added, which will result in the required ultraviolet light intensity being very high. High (the minimum light intensity used in its patent is 4-10mw / cm 2 ), increased the power consumption of the ultraviolet lamp device, and increased the corresponding production cost; 2, the regulation and control of light intensity was not carried out in each stage of the polymerization reaction, as the patent publication number is CN103059218B " ultraviolet light triggers template copolymerization method to synthesize cationic polypropylene In the embodiment 1 of the method of amides ", wherein with " dominant wavelength is 365nm, light intensity is 2mw / cm 2 , Initiate polymerization under the ultraviolet light irradiation for 45 minutes and then take it out. When the light is illuminated with a fixed light intensity, as the reaction progresses, the gelation of the polymerization system will become poorer, and the light intensity entering the system will become weaker, resulting in the freedom of the system. 3. Without a cooling system, when the temperature of polyacrylamide rises above 80°C during the polymerization process, the risk of cross-linking between molecular chains increases, and certain control measures should be taken. Temperature measures, such as the patent publication number CN107151289B "A Method for Preparing Cationic Polyacrylamide by Photoinitiation System", the total monomer mass fraction in the reaction system is 15%-50%, and the initiation is carried out at room temperature, and the reaction is theoretically calculated. When the total monomer mass fraction in the system is 50%, the temperature rise of the system exceeds 80°C, and the highest temperature exceeds 100°C, so the risk of crosslinking in the system is greatly increased