Method for producing high-performance high water absorption resin

Abstract

The invention relates to a production method of high-performance super absorbent resin, which includes six steps. Firstly, with more than fifty mole percent of neutralization rate, acidyl-containing monomer aqueous solution and polymerization initiator stay in a pipeline, so that free radical polymerization reaction occurs to obtain thick prepolymer, and acidyl-containing monomer is selected fromacrylic acid or methacrylic acid or 2-allylamine-2-methyl propane sulfonic acid or the compound; secondly, the thick prepolymer is added with long-chain and high-hydrophilic polyepoxy compound and isfurther converted into gelatiniform solid by utilizing a method of light-starting polymerization; thirdly, the gelatiniform solid is dried by hot wind with a temperature between 100 DEG C and 250 DEGC, smashed and filtered; fourthly, the solid is coated with surface crosslinking agent; fifthly, surface processing is carried out under a temperature between 80 DEG C and 230 DEG C; sixthly, inert inorganic salt powder is added. In the light-starting polymerization, the irradiation of ultraviolet light or infrared is utilized to initiate the prepolymer to be converted into gel.

Description

technical field [0001] The present invention is a method for producing superabsorbent resin, especially a method for producing water-absorbent resin with low soluble content. Background technique [0002] The superabsorbent resin has a strong water retention capacity, can absorb a hundred times or even a thousand times its own weight of water, and can swell after absorbing water, and maintain a non-flowing state, even if pressure is applied, it will not leak, and the absorbed water Can be released slowly in the atmosphere. Due to the above characteristics, it was first used as a soil water retaining agent in agriculture and forestry. In recent years, due to considerable progress in the production technology of superabsorbent resin, it is also widely used in sanitary products such as diapers, adult incontinence products and women's hygiene. Water-absorbing agent for supplies and fresh-keeping applications for food preservation, etc. [0003] The component materials of the s...

AI Technical Summary

Problems solved by technology

[0036] Since the superabsorbent resin has the phenomenon of agglomeration after moisture absorption, in order to avoid the agglomeration after moisture absorption of the superabsorbent resin used in high-humidity areas, which will cause rough processing, the surface of the superabsorbent resin is generally coated with inert inorganic salt powder or Surfactant, making the surface slightly lipophilic so that the superabsorbent resin retains the characteristics of not being easy to agglomerate after moisture absorption. The inert inorganic salt powder can be selected from aluminum sulfate, or silicon dioxide, or aluminum oxide, or magnesium oxide, or oxide Calcium, or kaolin, or calcium carbonate, or magnesium carbonate, etc. or their mixture; usually the amount of this inert inorganic salt powder added is related to the particle size of the inorganic salt powder, if the particle size is small, the specific surface area of ​​the inorganic salt powder is larger , so the effective inert inorganic salt powder consumption can be less, and its inert inorganic salt powder addition range is between the weight ratio percentage 0.005wt% to 10.0wt%, wherein with 0.01wt% to 4.0wt% better, inert inorganic salt powder The particle size is 0.001μM to 100μM. If the inorganic salt powder with particles smaller than 0.001μM is used, the cost will be too high and it is not conducive to industrial production. If the inorganic salt powder with particles larger than 100μM is used, the addition amount will affect the absorption of super absorbent resin. question