Preparation method of superabsorbent resin

A technology of superabsorbent resin and monomer, which is applied in the field of preparation of superabsorbent resin, can solve problems such as unsatisfactory liquid absorption rate, and achieve the effects of low cost, high efficiency and good salt resistance

Inactive Publication Date: 2016-03-16
LANZHOU UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the water-absorbent resin in the prior art is all unsatisfactory to the solution liquid absorption rate of 3% of salt content

Method used

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  • Preparation method of superabsorbent resin
  • Preparation method of superabsorbent resin
  • Preparation method of superabsorbent resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The impact of embodiment 1 monomer ratio on resin liquid absorption rate

[0028] Fix ω(NMBA)=0.022%, ω(KPS)=0.15%, the neutralization degree of AA and AMPS is 75%, the influence of different monomer molar ratios on the water absorption capacity of the resin is shown in Table 1, and Table 1 is the factor level. From Table 2, the optimal mole combination is: A 2 B 2 C 1 D. 1 , that is, the monomer ratio: n(AMPS):n(AA):n(AM)=1:2:0.5, when ω(starch)=3%, the liquid absorption rate of the water-absorbent resin reaches the maximum. The main reason is that with the increase of the ratio of AA to AM in the solution, the hydrophilic group -COO - When the ratio is too high, self-crosslinking occurs during copolymerization, and the expansion of the polymer network is limited during liquid absorption, so that the liquid absorption ratio decreases; when the amount of AMPS increases, the SO in the solution 3 -The number of AMPS increases and the charge density is higher, which ...

Embodiment 2

[0031] Example 2 The effect of the amount of crosslinking agent on the liquid absorption rate of superabsorbent resin

[0032] Fixed ω (KPS) = 0.15% (based on the total mass), the neutralization degree of AA and AMPS is 75%, n(AMPS):n(AA):n(AM)=1:2:0.5, ω( Starch) = 3%. The effect of the amount of cross-linking agent on the liquid absorption rate of superabsorbent resin is shown in Table 3. It can be seen from Table 3 that with the increase of the amount of cross-linking agent, the liquid absorption rate of the resin first increases and then decreases. When the amount of cross-linking agent is 0.023% of the total mass, the liquid absorption rate of the resin is the highest. The main reason is that when the amount of cross-linking agent is low, the cross-linking reaction is incomplete, the degree of cross-linking is weak, and the formed space network structure is not obvious, which reduces the water absorption rate of the resin; when the amount of cross-linking agent is too la...

Embodiment 3

[0034] The influence of embodiment 3 initiator dosages on resin liquid absorption rate

[0035] Fixed ω(NMBA)=0.023% (based on the total mass), the neutralization degree of AA and AMPS is 75%, n(AMPS):n(AA):n(AM)=1:2:0.5, ω( Starch) = 3%. The effect of the amount of initiator on the liquid absorption rate of superabsorbent resin is shown in Table 4. It can be seen from Table 4 that when the amount of initiator is too small, the reaction speed is slow, the reactive points in the reaction system are less, and the resin cannot effectively form a three-dimensional space network structure, so the liquid absorption rate is low; when the amount of initiator is high, the polymerization rate Too fast, the resin forms a three-dimensional network space with more branched chains, so the liquid absorption rate decreases. Therefore, when the amount of initiator is 0.15%, the liquid absorption rate of the resin is the highest.

[0036]

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Abstract

The present invention discloses a preparation method of a superabsorbent resin containing starch grafted acrylic acid (AA), acrylamide (AM) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS). The preparation method of the superabsorbent resin is as below: adding an initiator into gelatinized starch to conduct initiation; then neutralizing the AA and AMPS solution with NaOH or KOH solution under the condition of sufficient cooling; then adding the monomer mixture of AA, AM and AMPS into the starch solution to conduct a starch graft polymerization reaction. The method uses starch as a graft monomer material, which is widely available, inexpensive, biodegradable, environmentally friendly and easy to operate and more friendly to the environment; the obtained resin has good salt resistance and high water absorption rate, and can reach imbibition equilibrium within 5 min.

Description

technical field [0001] The invention relates to a preparation method of a superabsorbent resin, in particular to a preparation method of a starch-grafted acrylic acid, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid water-absorbent resin. Background technique [0002] Superabsorbent resin is a new type of polymer material that has been developed rapidly in recent decades. It has good water absorption and water retention. Therefore, it is widely used in agriculture, forestry, environmental protection, food, etc., and plays an important role in the national economy and people's lives. [0003] At present, the preparation methods of superabsorbent resin mainly include aqueous solution polymerization method and reverse phase suspension polymerization method. Because the aqueous solution polymerization method is easy to operate and relatively friendly to the environment, it is generally used in industry to synthesize superabsorbent resins. In the prior art, acrylic aci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F220/58C08F2/10
CPCC08F251/00C08F2/10C08F220/06
Inventor 李茸陈港泉赵仕玲霍鸿飞
Owner LANZHOU UNIVERSITY
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