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Preparation method of macromolecular water-absorbent resin with low reverse osmosis

A technology of superabsorbent resin and water-absorbent resin, applied in the field of sanitary products, can solve the problems of reduced stability of sanitary products, increased production cost, etc. The effect of improving polymerization stability

Active Publication Date: 2014-07-09
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] There are also manufacturers of sanitary products that increase the amount of superabsorbent resin to reduce or eliminate the discomfort caused by the superabsorbent resin seepage back, but this approach will inevitably lead to an increase in production costs
The more serious consequence is that the amount of superabsorbent resin used in sanitary products is not as good as possible, and the addition of more superabsorbent resin will reduce the stability of sanitary products.

Method used

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  • Preparation method of macromolecular water-absorbent resin with low reverse osmosis
  • Preparation method of macromolecular water-absorbent resin with low reverse osmosis

Examples

Experimental program
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Effect test

Embodiment 1

[0048] a) Add 30kg of acrylic acid and 10kg of deionized water into the reactor, start stirring, slowly add 14kg of 48% sodium hydroxide aqueous solution dropwise, and keep the temperature of the reactor at 20-40°C. After neutralization, add comonomer N,N-methylenebisacrylamide 9g, photocatalyst 1-hydroxycyclohexyl phenyl ketone 0.01kg, thermal initiator ammonium persulfate 34.2g, 30% hydrogen peroxide 10g, ten Dialkyl sodium sulfate 60g and sodium hypophosphite 3g, continue to fully stir. Cool the reaction kettle to keep the temperature of the reaction solution at about 5°C.

[0049] b) Pour the low-temperature mixed material into a trapezoidal polymerization tank, so that the height of the material is 1cm-5cm. The reaction material is irradiated with ultraviolet light, the initiation temperature is about 5°C, and the irradiation time is 18s; then the reaction solution continues to react and continue to heat up. When the temperature reaches 100°C (the polymerization has last...

Embodiment 2

[0054] a) Add 30kg of acrylic acid and 17kg of deionized water into the reactor, start stirring, slowly add 21kg of 48% sodium hydroxide aqueous solution dropwise, and keep the temperature of the reactor at 20-40°C. After neutralization, add comonomer pentaerythritol triacrylate 3g, photocatalyst phenyl bis(2,4,6-trimethylbenzoyl) phosphine oxide 15g, thermal initiator ammonium persulfate 36g and 5ppm chloride Iron, continue to stir well. Cool the reaction kettle to keep the temperature of the reaction solution at about 10°C.

[0055] b) Pour the low-temperature mixed material into a trapezoidal polymerization tank, so that the height of the material is 1cm-5cm. Use ultraviolet light to irradiate the reaction material, the trigger temperature is controlled at about 10°C, and the irradiation time is 40s; then the reaction solution continues to react and continue to heat up, when the temperature reaches 130°C, it starts to cool down, when the surface temperature of the colloid ...

Embodiment 3

[0060] a) Add 30kg of acrylic acid and 15kg of deionized water into the reactor, start stirring, slowly add 26kg of 48% sodium hydroxide aqueous solution dropwise, and keep the temperature of the reactor at 5-15°C. After neutralization, 60 g of comonomer polyethylene glycol (400) diacrylate, 1 g of photocatalyst 1-hydroxycyclohexyl phenyl ketone, 15 g of di-tert-butyl peroxide and 150 g of acrylamide were added, and the stirring was continued sufficiently. Cool the reaction kettle to keep the temperature of the reaction solution at about 10°C.

[0061] b) Pour the low-temperature mixed material into a trapezoidal polymerization tank, so that the height of the material is 1cm-5cm. Use ultraviolet light to irradiate the reaction material, the initiation temperature is controlled at about 10°C, and the irradiation time is 10s; then the reaction solution continues to react and continue to heat up, when the temperature reaches 100°C (the polymerization has lasted for 30 minutes at th...

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Abstract

The invention provides a preparation method of macromolecular water-absorbent resin with low reverse osmosis. According to the method, a polymerization stabilizing additive is added and process conditions are reasonably controlled during a polymerization process, so that the polymerization reaction is stable and the process is simple. A surfactant is added before the surface crosslinking of water-absorbent resin powder; meanwhile, a phase transfer catalyst is added during the surface crosslinking. Thus, the phenomenon of caking of the water-absorbent resin powder during the surface crosslinking is avoided, so that surface crosslinking solution is uniformly distributed. Therefore, the solution absorbing ability and the reverse osmosis resisting ability of the water-absorbent resin are greatly improved. The water-absorbent resin is suitable for physical hygiene products.

Description

technical field [0001] The invention relates to a preparation method of a high-performance water-absorbent resin, in particular to the synthesis of a water-absorbent resin with low back-seepage ability and high absorption and retention capacity, which is a special water-retaining agent in the field of physiological and sanitary products, especially suitable for baby diapers, Adult diapers, women's sanitary napkins and other sanitary products that have high requirements for the amount of liquid rewet after absorbing liquid. Background technique [0002] Superabsorbent resin is a new type of functional polymer material, which can absorb and retain (even under pressure) hundreds or even thousands of times its own mass of pure water or tens of times of normal saline. In the 1950s, the Goodrich Company of the United States developed cross-linked polyacrylic acid, a typical superabsorbent material that was used as a tackifier at that time. At the same time, Paul Flory (Flory Paul...

Claims

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Application Information

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IPC IPC(8): C08J7/06C08J3/24C08F220/06C08F2/48
Inventor 韩洋代春丽杨文李春张志宇华卫琦
Owner WANHUA CHEM GRP CO LTD
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