Preparation method for high-molecular surfactant

Abstract

The invention relates to a preparation method for a high-molecular surfactant. The method comprises the following steps: uniformly mixing sodium phosphate, polyacrylamide aqueous solution, diallyldimethylammonium chloride and water to form a mixture, wherein the mass ratio of the polyacrylamide aqueous solution to the cationic monomer is 20-5:1; heating the mixture obtained in the step 1 to 30-50 DEG C; dropwise adding cyclohexanone peroxide into the mixture obtained in the step 2; gradually heating the mixture obtained in the step 3 to 55-95 DEG C, and keeping warm at 55-95 DEG C for 4 h; and step 4, adding a cyclic ether compound into the system obtained in the step 4, keeping warm at 50-80 DEG C for 120-150 min, cooling to 20-25 DEG C, and discharging so as to obtain the high-molecular surfactant. The obtained high-molecular surfactant possesses extremely high activity, relatively high solid content and relatively good stability, and is applicable to preparation of alkyl ketene dimmers (AKD), alkenyl succinic anhydride (ASA) and other papermaking chemical emulsions.

Description

technical field [0001] The invention relates to a preparation method of a surfactant, in particular to a preparation method of a surfactant used as a sizing emulsifier in papermaking. Background technique [0002] Alkenyl succinic anhydride (ASA) and alkyl ketene dimer (AKD) are two reactive neutral / alkaline sizing agents commonly used in papermaking. However, ASA and AKD are insoluble in water and can only be uniformly dispersed after emulsification. Dispersed in the paper material system; at the same time, it is easily hydrolyzed, so it must be emulsified on site before adding, and the emulsification technology has become an important factor affecting its sizing performance, which requires an efficient surfactant to promote ASA and emulsification of AKD. [0003] Chinese patent CN102892832 mentions a method of using aldehyde-functionalized polymers to improve paper machine performance and enhance sizing. The patent uses DADMAC and acrylamide to prepare copolymers, which a...

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Problems solved by technology

[0003] Chinese patent CN102892832 mentions a method of using aldehyde-functionalized polymers to improve paper machine performance and enhance sizing. The patent uses DADMAC and acrylamide to prepare copolymers, which are then hydroformylated with glyoxal to obtain polymer surfactants , used in the ASA surface sizing process, but it will cause the ASA emulsion particles to increase, which is not conducive to the sizing of ASA

[0004] Both Chinese patents CN101688370 and CN101778873 mentioned that a glyoxalated polyacrylamide with high solid content is used as an ASA emulsifier, which can effectively improve the dehydration efficiency of papermaking, but the shelf life of the product is short, only 45 days to 60 days. Good for long-term storage and production applications

[0011] Yu Dehai used sodium fluoride modified bentonite with negative charge as inorganic solid particle emulsifier, successfully prepared a stable ASA emulsion according to the Pickering emulsion stability theory, and also successfully realized the compounding of modified bentonite / magnesium aluminum hydroxide The modified bentonite / chitosan compound is used to emulsify ASA, the resulting emulsion is more stable, but the emulsion can only maintain a good sizing effect within 30 minutes, and the sizing effect of the emulsion drops sharply after being stored for 1 hour

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