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High molecular weight anionic polyacrylamide and its preparation method and application
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A polyacrylamide, anionic technology, applied in the chemical field, can solve the problems of ammonia gas generation, complex process, and difficulty in preparing anionic polyacrylamide.
Active Publication Date: 2019-08-06
罗山县中原聚合物有限公司
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[0003] The existing anionic polyacrylamide preparation methods use acrylamide as a raw material, and are mostly obtained through copolymerization or modification reactions with anionic monomers. There are many kinds of additives, harsh conditions, and difficult control. It is difficult to obtain polyacrylamide with a molecular weight greater than 25 million. Anionic polyacrylamide
[0004] Chinese patent CN1865298 discloses a three-stage composite initiator for synthesizing ultra-high molecular weight polyacrylamide, which is used to synthesize polyacrylamide with a molecular weight above 25 million; the three-stage composite initiation system consists of a reaction rate control agent, a cosolvent, The one-stage, two-stage, and three-stage initiation systems are composed according to a certain ratio; the invention can effectively control the reaction speed in practical applications, while the Chinese patent CN1865299 discloses the subsequent hydrolysis process and equipment for synthesis. This method prepares anionic polyacrylamide, The process is complicated, the reaction time is long, and ammonia gas is generated during the hydrolysis process, which will cause environmental pollution if it is not recycled
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Embodiment 1
[0031] This embodiment provides a preparation method of high molecular weight anionic polyacrylamide, which comprises the following steps:
[0032] According to the mass ratio of 10:1:50 in the polymerization reaction, mix acrylamide monomer, sodium carbonate and deionized water evenly to obtain an acrylamide solution; Under the conditions, according to the mass ratio of 1000:3, a combined initiator was added to the acrylamide solution, and the photopolymerization reaction was carried out for 2 hours to obtain a polyacrylamide colloid; wherein, the combined initiator included benzaldehyde benzoin dimethyl ether, peroxide Potassium sulfate and sodium formaldehyde sulfoxylate; and the mass ratio of benzaldehyde benzoin dimethyl ether, potassium persulfate and sodium formaldehyde sulfoxylate is 8.5:2.7:1.54;
[0033] Primary hydrolysis Heat the polyacrylamide colloid to 85-90°C and keep it warm for 3 hours to hydrolyze sodium carbonate and polyacrylamide colloid to obtain anionic...
Embodiment 2
[0036] This example provides a method for preparing high-molecular-weight anionic polyacrylamide. The difference between this example and Example 1 is that the combined initiator includes ethylenediaminetetraacetic acid, potassium persulfate and sodium formaldehyde sulfoxylate ; And the mass ratio of ethylenediaminetetraacetic acid, potassium persulfate and sodium formaldehyde sulfoxylate hydrate is 16:2.7:1.54;
Embodiment 3
[0038] This embodiment provides a preparation method of high molecular weight anionic polyacrylamide, which comprises the following steps:
[0039] According to the mass ratio of 8:1:50 in the polymerization reaction, mix acrylamide monomer, sodium carbonate and deionized water evenly, and react for 3 hours to obtain an acrylamide solution; Under the condition of ~13.5°C, according to the mass ratio of 1000:2, add a combination initiator, polymerize for 3 hours, and obtain polyacrylamide colloid; the combination initiator includes azobisisobutylamidine hydrochloride, potassium persulfate, and The mass ratio of azobisisobutylamidine hydrochloride and potassium persulfate is 6:1;
[0040] Primary hydrolysis Heat the polyacrylamide colloid to 85-90°C for 2 hours to obtain anionic polyacrylamide semi-finished products;
[0041] The anionic polyacrylamide semi-finished product is crushed and granulated by secondary hydrolysis, and then at 75-85°C, according to the mass ratio of 10...
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Abstract
The invention provides a preparation method of high-molecular-weight anionic type polyacrylamide. The method includes the following steps that an acrylamide monomer, sodium carbonate and deionized water are mixed evenly, and an acrylamide solution is obtained; nitrogen is introduced into the acrylamide solution for 20-40 min, at 12.5-13.5 DEG C, an initiator is added for reaction for 2-4 hours, and polyacrylamide colloid is obtained; the polyacrylamide colloid is heated to 85-90 DEG C, heat preservation is then conducted for 2-3 hours, and a semi-finished anionic type polyacrylamide product is obtained; the semi-finished anionic type polyacrylamide product is crushed and pelletized, at 75-85 DEG C, sodium hydroxide is added for reaction for 2-3 hours, and the high-molecular-weight anionic type polyacrylamide is obtained. The invention further provides the high-molecular-weight anionic type polyacrylamide prepared by means of the method, and the high-molecular-weight anionic type polyacrylamide has the advantages of being large in molecular weight and high in dissolution speed, and has broad application prospects.
Description
technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a high-molecular-weight anionic polyacrylamide and its preparation method and application. Background technique [0002] High molecular weight anionic polyacrylamide (PHP) flocculants are widely used in sewage treatment because of their excellent performance and environmental friendliness. PHP has the functions of flocculation, thickening, resistance reduction and dispersibility, and is widely used in oil extraction, mineral processing, coal washing, metallurgy, chemical industry, papermaking, environmental protection and other fields. [0003] The existing anionic polyacrylamide preparation methods use acrylamide as a raw material, and are mostly obtained through copolymerization or modification reactions with anionic monomers. There are many kinds of additives, harsh conditions, and difficult control. It is difficult to obtain polyacrylamide with a molecular weight ...
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