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Method for producing high-performance high water absorption resin

A technology of super absorbent resin and manufacturing method, which can be used in absorbent pads, medical science, bandages, etc., and can solve the problems of no economic benefit, affecting quality, and easy degradation of resin.

Active Publication Date: 2008-03-19
FORMOSA PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the processing temperature is below 80°C, the cross-linking reaction time is too long, which is not economical. When the processing temperature is ≥230°C, the resin is easy to deteriorate and affect the quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) First add 1760 parts by weight of acrylic acid and 2263.7 parts by weight of water in the neutralization tank, then slowly add 1476.3 parts by weight of aqueous sodium hydroxide solution (concentration: 45%) in the above-mentioned acrylic acid solution under ice bath. At this time, an aqueous solution with a monomer concentration of 38.6 wt % was obtained, in which 68 mol % of acrylic acid was neutralized into sodium acrylate.

[0036] (2) After the neutralization procedure is completed, use water to adjust the temperature to control the partially neutralized sodium acrylic acid salt solution to about 20°C.

[0037] (3) Adjust the flow rate of the above-mentioned monomer solution to 100 liters / hour so that it passes through a stainless steel pipe with a diameter of 5 cm and a total length of 26.35 meters. A stainless steel tube with a diameter of 0.5 and 0.9 cm is respectively connected to the sides at 5 cm and 10 cm from the stainless steel tube inlet end. The for...

Embodiment 2

[0045] (1) Repeat Example 1, but the irradiation time of the first stage is 10 seconds, and the irradiation time of the latter stage is 30 seconds. As a result, the retention force of the obtained superabsorbent resin is 32.4g / g, and the water absorption ratio under the pressure of 49g / cm2 is 22.3 g / g, soluble content = 8.7%.

Embodiment 3

[0047] (1) Repeat Example 1, but the irradiation time of the first stage is 15 seconds, and the irradiation time of the latter stage is 30 seconds. As a result, the retention force of the obtained superabsorbent resin is 31.6g / g, and the water absorption ratio under the pressure of 49g / cm2 is 22.4 g / g, soluble content = 9.5%.

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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 from acrylic 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 is further 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 DEG C, 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...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F226/02C08F4/28C08F4/40C08F4/04C08F2/44C08K3/22A61L15/24C08K5/00
Inventor 施凯耀吴政璋钟宏宗黎元中
Owner FORMOSA PLASTICS CORP
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