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Method for fast preparing high water absorption resin

A super absorbent resin and rapid technology, which is applied in the field of rapid preparation of super absorbent resin, can solve the problems of shortened polymerization induction period, high residual monomer content, difficult control of production process, etc., so as to shorten the polymerization reaction time, The effect of improving the polymerization efficiency and increasing the solid content of the gel

Active Publication Date: 2008-01-09
SHANGHAI HUAYI NEW MATERIAL
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the reaction initiation temperature is higher than the initiation temperature of the oxidation initiator, the induction period for initiating polymerization is greatly shortened, making the production process difficult to control, and the residual monomer content in the final product is biased due to the severe polymerization reaction at high temperature. high

Method used

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  • Method for fast preparing high water absorption resin
  • Method for fast preparing high water absorption resin
  • Method for fast preparing high water absorption resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Get 694g of 32wt% ionic membrane alkali, dilute with 700g of deionized water, add 460g of ice crystal acrylic acid in the lye in 10 minutes at normal temperature, then add 4wt% polyethylene glycol diacrylate (molecular weight 400) 40 g of acrylic acid solution, at this time the temperature of the monomer aqueous solution rose to 50°C.

[0037] Get above-mentioned monomer solution 400g (50 ℃), add initiator and be that concentration is 10g of potassium persulfate aqueous solution of 0.2wt%, concentration is 0.1wt% sodium bisulfite aqueous solution 10g, the mixing time of initiator and monomer solution is not After 30 seconds, put the monomer solution into a Teflon tray (200×280mm) in a 90°C oven for polymerization reaction, the thickness of which is 7mm, and the reaction reaches the highest temperature of 102°C in 6 minutes. The reaction is complete, and there are 380 g of polymer gels with a large number of fine bubbles, and the thickness of the gel is 6 mm.

[0038] T...

Embodiment 2-3

[0041] Using the same preparation process as in Example 1, changing the neutralization degrees of acrylic acid and alkali to 75wt% and 70wt% respectively, the performance test results of the prepared superabsorbent resin are shown in Table 1.

Embodiment 4-6

[0054] Using the same preparation process as in Example 1, controlling the acid-base neutralization temperature, so that the initial reaction temperature of the polymerization is 60, 70 and 80°C respectively, to prepare superabsorbent resins with different polymerization reaction times, their performance test results are shown in Table 2.

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Abstract

Preparation of SAP is carried out by taking acrylic acid as monomer, taking ion film base as neutralizer, heating to initial temperature, adding into cross-linking agent and oxidation reducing evocating agent, aqueous solution polymerizing, drying, crushing, screening and surface cross-linking treating. It has fast reactive speed and high normal saline absorptive rate. It can be used for sanitary products and continuous production.

Description

technical field [0001] The present invention relates to a rapid preparation method of superabsorbent resin, in particular to using acid-base neutralization heat to directly make the temperature of monomer solution reach the initial temperature of polymerization reaction, and to make the reaction tend to be complete by using the heat of polymerization during the polymerization reaction process, thereby The polymerization reaction can be completed in a short time. The superabsorbent resin obtained by the method of the present invention has good physiological saline absorption rate under normal pressure and 2kPa pressure, water retention capacity and low residual monomer content, and can be effectively used as sanitary products, such as disposable diapers and sanitary napkins, etc. . Background technique [0002] Super absorbent resin is referred to as SAP for short. Super absorbent resin effectively utilizes its ability to quickly absorb a large amount of water-based liquids,...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F4/40
Inventor 周柳茵王月珍邵华德印俊马建学邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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