Method for quickly and continuously preparing high-molecular-weight polyacrylamide
The invention relates to a method for quickly and continuously preparing high-molecular-weight polyacrylamide. According to the method, microwaves are introduced into a belt type reactor, so that the problems that during a kettle type reaction, the heat of polymerization is difficult to discharge, a colloid is difficult to take out and the monomer residual volume is high are solved, and the microwaves are favorable for improving the production efficiency of polyacrylamide. The method has the main technical features that an acrylamide (AM) aqueous solution or an AM aqueous solution, a comonomer aqueous solution, an auxiliary agent, a chain transfer agent and the like are added into a blending tank according to a certain mass ratio, the blending tank is adjusted to a certain temperature, nitrogen is inflated to remove oxygen for a certain period of time, then the solution in the blending tank and an initiating agent solution are continuously added to a conveying belt at a certain speed, and a continuous polymerization reaction is performed by controlling the temperature, wherein the conveying belt is subjected to oxygen removal by using nitrogen and runs at a certain speed. A formed polymer colloid is subjected to pelletizing, drying and crushing to obtain white polymer powder with high molecular weight and good water solubility. The method disclosed by the invention is simple in process, has the advantages of environmental protection and energy conservation, and can greatly improve the production efficiency and reduce the production cost. 1. A quick and continuous method, method for preparing high molecular weight polyacrylamide method, which is characterized in that: (1) aqueous solution or AM acrylamide (AM), copolymerized monomer aqueous solution, cosolvent, chain transfer agent, etc. according to a certain quality ratio add the adjuvants tank, respectively, wherein the concentration of monomer is 15-50%, adjusting dispensing tank to a certain temperature, nitrogen filled deaerization the solution after a certain period of time, then armaturen groove with the initiator solution of the solution in a certain continuous speed is added to the nitrogen in addition to peroxide in a certain speed of the conveying belt operation, in 0-85 the polymerization temperature continuously [...] 15-90 min, to form polyacrylamide or polyacrylamide copolymer colloid, the colloid by the thickness of 2-20 mm; (2) polyacrylamide or polyacrylamide copolymer colloid under the wiper by the scraper, directly enters the pelletizer from the discharge port, causing the diameter is 2-5 colloid mm; (3) drying temperature the 40-100 [...] , in the drying equipment for drying 4-16 h, to obtain the solid polyacrylamide or polyacrylamide copolymer of small particles; (4) crushing the dried solid polyacrylamide or polyacrylamide copolymer of small particles, to obtain white soluble polymer powder. 2. The stated according to Claim 1, step (1) of the acrylamide monomer is dimethyl diallyl ammonium chloride (DMDAAC), methyl propyl methoxyethyl trimethyl ammonium chloride (DMC), acryloyl ethyl trimethyl ammonium chloride (DAC), sodium acrylate, 2-acrylamide-2-methyl propane sulfonic acid (AMPS) capable of free radical polymerization, such as all monomer, adding different monomer, it is able to produce a non-ionic polyacrylamide, cationic polyacrylamide, amphoteric polyacrylamide, anionic polyacrylamide, and the like. 3. The stated according to Claim 1, step (1) the initiator can be a single initiator, can also be a combination of various types of initiator; can be formed by oxidizing agent, a reducing agent and a water-soluble azo initiator, also can be an oxidation-reduction system or water-soluble azo-initiator used singly, wherein the oxidizing agent is a persulfate, such as potassium persulfate, ammonium persulfate or sodium persulfate, preferred is ammonium persulfate, adding amount is acrylamide or polyacrylamide comonomer quality 0.001-1% ; the reducing agent is sulfite, such as sodium sulfite, ammonium sulfite, potassium sulfite, sodium bisulfite, potassium sulfite, sodium pyrosulfite, lopsided potassium sulfite, etc., preferably sodium bisulfite, the amount of the monomer is 0.0005-1%, the reducing agent also can be an organic amine, such as: ethylenediamine, diethylamine, triethylamine, pyridine, etc., preferably triethylamine, its adding amount is 0.01-1.0% ; water-soluble azo initiator can be azoformamide two isobutyl trunks hydrochloride (V-50), azo double (two blind base propane) dihydrochloride (V-44), 4, 4'-azo-di (4-cyano valeric acid) (V-501), azo diisopropyl butyric acid two armor fat (V-601), and the like, the quality of the monomer added amount is 0.001-1%. 4. The stated according to Claim 1, step (1) the cosolvent is urea or thiourea, its consumption is acrylamide or polyacrylamide comonomer quality 1-10%, preferably 4-8%. 5. The stated according to Claim 1, steps (1) states the chain chain transfer agent, may be mercapto acetic acid, sodium benzoate, sodium formate, mercaptan, isopropyl alcohol, sorbitol, glycolic acid, etc., these chain transfer agent can be used alone, also can be mixed for use, its consumption is acrylamide or acrylamide comonomer quality 0.005-1%. 6. The stated according to Claim 1, step (1) the polymerization reaction is carried out under the protection of inert gas, the inert gas can be high purity nitrogen, argon, carbon dioxide gas and the like, preferably high-purity nitrogen. 7. The stated according to Claim 1, step (1) the polymerization reaction apparatus, the control valve "2 the star [...] of" the 1 [...] , control of the thickness of the distributor "the 3 [...] , incubator" the 4 [...] , roller "the 10 [...] , the edge is provided with a protruding" 9 the conveyor belt [...] of "8 the a [...] , through the heater" the 7 [...] , control polymerization initiation temperature of the system, to a certain degree of polymerization, the reaction materials with microwave suppressor the two ends of "5 the microwave reaction system [...] " the 6 [...] , the final colloid through the scraper " 11 the from conveying belt [...] , into the granulator. 8. The stated according to Claim 1, step (1) the heater 7 the heating source can be water, water vapor, oil or electric heating, conventional reaction temperature of the reactor in the 0-85 [...] , reaction time 15-90 min, reaction system wherein the microwave by controlling the microwave output power monitor real-time the reaction temperature, the temperature of the microwave reactor the 40-90 [...] , reaction time 3-30 min. 9. The stated according to Claim 1, step (1) the stated, the free radical polymerization reaction of a photoinitiator can be used, the reaction time 3-30 min.