Preparation method of emulsion-type thickening agent
The invention relates to a preparation method of an emulsion-type thickening agent. The preparation method comprises the following steps of raw material pretreatment, initiator solution preparation, aftertreatment solution preparation, polymerization and other follow-up treatment processes. Compared with the prior art, the preparation method utilizes a starved polymerization technology to prepare the emulsion-type thickening agent so that copolymer structure homogeneity is realized; the ammonia ester bond has hydrolysis resistance superior to that of an ester bond and the appropriate temperature and initiator are selected so that the emulsion-type thickening agent has good thickening properties and stability; the emulsion-type thickening agent is a novel aqueous thickening agent and has characteristics of environmental friendliness, good safety and excellent performances; and the preparation method has simple processes and can be realized easily. 1. A method for preparing emulsion thickening agent, characterized in that comprises the following steps: (1) pretreatment of raw material: the methyl acrylic acid, acrylic acid esters and cross-linking agent into the container by evenly mixing A mixed raw material in the spare, the emulsifier A, associative monomer and deionized water are added to a container of homogeneous dissolution in B, stirred, into a container of the mixed raw material in A, after finishing joining 80-120rpm stirring speed of 0.5-1 hour, after the emulsified mixed raw material prepared in batches by adding constant voltage drop in the funnel; (2) preparation of initiator solution: an initiator dissolved in a certain amount of deionized water, then the magnetic stirrer to 250-300rpm stirring speed of 0.5-1 hours, then batch by adding constant voltage dropping funnel in a; (3) treatment after compounding: of a certain amount of the initiating agent is soluble in deionized water with a magnetic stirrer in 250-300rpm stirring speed of 0.5-1 hours, then adding constant voltage dropping funnel in a; (4) polymerization reaction: in the reaction vessel by adding a certain amount of deionized water, stirred, adding emulsifier B and initiator, and increasing the temperature to the 80-90 [...] , 5-10 minutes to the reaction container at the same time the uniform dripping step (1) the dropping funnel in a constant pressure in the emulsified mixed raw material and step (2) of the initiator in solution, and the 2.5-3 hours after dropping; (5) after the completion of the dropping, thermal insulation 30-60 minutes; (6) adding step (3) of the treatment fluid in the, lowering the temperature to after the adding the 40 [...] the following; (7) detection, can be qualified after the discharging; Wherein the methyl acrylic acid, acrylic ester and an associative monomer the ratio of quality part between the: 30-45:50-65: 1-8. 2. Method for preparing emulsion thickening agent according to Claim 1, characterized in that the associative monomer is BE-20 (hea-IPDI-three styrene phenol polyethylene oxide (EO= 20) polyurethane big monomer), BE-25 (hea-IPDI-three styrene phenol polyethylene oxide (EO= 25) polyurethane big monomer), BE-40 (hea-IPDI-three styrene phenol polyethylene oxide (EO= 40) polyurethane big monomer)) of one or of a mixture of several kinds; The acrylate is ethyl acrylate and methacrylate, butyl acrylate and acrylic acid isooctyl one or in several. 3. Method for preparing emulsion thickening agent according to Claim 1, characterized in that the cross-linking agent is divinylbenzene, ethylene glycol double (meth) acrylate, diglycol double (meth) acrylate, trimethylolpropane (meth) acrylic acid ester propane three in one or several kinds of. 4. Method for preparing emulsion thickening agent according to Claim 1, characterized in that the emulsifier is A EP-100, AES, CO -436, CO -897 in two or several kinds of. 5. Method for preparing emulsion thickening agent according to Claim 1, characterized in that the emulsifying agent B as AES, K-12, EP -100, CO -897 in two or several kinds of. 6. Method for preparing emulsion thickening agent according to Claim 1, characterized in that the initiator is ammonium persulfate, sodium persulfate, potassium persulfate and other persulfate such. 7. Method for preparing emulsion thickening agent as in any of claims 1 to 6, characterized in that step (1) in, mixed raw material container in A of the added speed is 10-30g/min. 8. Method for preparing emulsion thickening agent as in any of claims 1 to 6, characterized in that step (2) in, the initiator in the initiator solution quality percentage content is 0.2%; Step (3) in, the quality of the initiator after-treatment in the fluid states percentage content is 0.2%. 9. Method for preparing emulsion thickening agent as in any of claims 1 to 6, characterized in that step (4) in, the emulsifier B and the initiator of the ratio of quality part 6-12: 0.05-0.1. 10. Method for preparing emulsion thickening agent according to Claim 1, characterized in that step (4) in, the acceleration of the emulsified mixed raw material is 3.0-4.0g/min, initiator solution of the acceleration drops to 0.25-0.35 ml/min.