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Super water-absorbing resin continuously prepared by reversed-phase suspension polymerization

A superabsorbent resin and suspension technology, applied in the field of water absorbent resin, can solve the problems of low product performance stability, poor customer experience, limited marketing, etc., achieve easy control of flow rate and temperature, and improve water absorption rate performance , to solve the effect of low production efficiency

Active Publication Date: 2021-03-30
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This polymerization process needs to be carried out at low temperature and high-pressure mercury lamps are used as the starting light source, resulting in high energy consumption. Because the polymerization tube needs to be made of glass material, there is a safety risk in industrialization.
[0006] To sum up, the main problem existing in the current reverse-phase suspension polymerization process is that the improvement of water absorption performance faces a process bottleneck, and it no longer has application performance advantages in the face of competition from new preparation processes. At the same time, low production efficiency and high manufacturing costs lead to limited market promotion and stable product performance. Low performance leads to poor customer experience

Method used

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  • Super water-absorbing resin continuously prepared by reversed-phase suspension polymerization
  • Super water-absorbing resin continuously prepared by reversed-phase suspension polymerization
  • Super water-absorbing resin continuously prepared by reversed-phase suspension polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Step a:

[0085] Add 3000g of acrylic acid into a small test kettle, add 4100g of 32% NaOH, 2550g of deionized water, 22.5g of trimethylolpropane, and 5.75g of sodium persulfate, stir for 15 minutes to neutralize the acid and alkali and mix it uniformly, then Cool and control the temperature to 25°C to obtain an aqueous acrylic acid solution for later use.

[0086] Add 10,000g of n-heptane into a small test kettle and heat it. After the temperature rises to 50°C, add 120.7g of sucrose fatty acid ester to it, and then control the temperature to 50°C to obtain n-heptane with dispersant dissolved in it for later use.

[0087] Add acrylic acid aqueous solution into the suspension tank at 448g / min using a peristaltic pump, and continuously add n-heptane into the suspension tank at a flow rate of 1452.9g / min using a peristaltic pump. Add it into the suspension tank, adjust the stirring speed of the suspension tank to control the particle size of the suspended particles to 68...

Embodiment 2

[0096] Step a:

[0097] Add 3000g of acrylic acid into a small test kettle, add 4100g of 32% NaOH, 2550g of deionized water, 0.6g of glycerol diglycidyl ether, and 5.75g of potassium persulfate, and stir for 15 minutes to neutralize the acid and alkali and mix it evenly. Then cool and control the temperature to 25° C. to obtain an aqueous acrylic acid solution for future use.

[0098] Add 10,000g of n-heptane into a small test kettle and heat it. After the temperature rises to 50°C, add 10.75g of octadecyl monophosphate to it, and then control the temperature to 50°C to obtain n-heptane dissolved in a dispersant for use.

[0099] Add acrylic acid aqueous solution into the suspension tank at 448g / min using a peristaltic pump, and continuously add n-heptane into the suspension tank at a flow rate of 818.4g / min using a peristaltic pump, and at the same time, add polystyrene particles with a particle size of 38μm at a flow rate of 50g / min Add it into the suspension tank, adjust t...

Embodiment 3

[0107] Step a:

[0108] Add 2400g of acrylic acid into a small test kettle, add 3500g of 32% NaOH, 4270g of deionized water, 0.6g of ethylene glycol diglycidyl ether, and 22.75g of ammonium persulfate, stir for 15 minutes to neutralize the acid and alkali and mix it evenly , and then cooled to control the temperature to 25°C to obtain an aqueous acrylic acid solution for later use.

[0109] Add 10,000g of cyclohexane into a small test kettle and heat it. After the temperature rises to 50°C, add 60.75g of sucrose fatty acid ester into it, and then control the temperature to 50°C to obtain cyclohexane dissolved in dispersant for use.

[0110] Add acrylic acid aqueous solution into the suspension tank at 448g / min using a peristaltic pump, and continuously add n-heptane into the suspension tank at a flow rate of 818.4g / min using a peristaltic pump. Add it into the suspension tank, adjust the stirring speed of the suspension tank to control the particle size of the suspended parti...

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Abstract

The invention provides a super water-absorbing resin continuously prepared by reversed-phase suspension polymerization. According to the resin, construction of a continuous suspension system and continuous two-section tubular polymerization are adopted to prepare double-shell-layer hollow-structure water-absorbent resin particles. A polymer template is introduced at the early stage of polymerization to form a core-shell structure, then continuous tubular polymerization is carried out to form a double-shell layer, and finally an inner core is removed to obtain the water-absorbing particles withthe double-shell layer hollow structure. The water absorption rate of the water-absorbing resin particles is higher, the liquid absorption rate is higher, and particle size distribution is more centralized.

Description

technical field [0001] The invention belongs to the field of water-absorbent resins, in particular to a superabsorbent resin prepared continuously by reverse-phase suspension polymerization. Background technique [0002] Superabsorbent resin (SAP) is a polymer compound that can absorb hundreds or even thousands of times of its own water. Its moderate cross-linked structure has the ability to absorb water under pressure and retain water under pressure. Due to its excellent water absorption capacity and low production cost, superabsorbent resins are widely used in diapers, sanitary napkins, pet pads, water-blocking materials for cables, and water-retaining agents for agriculture and forestry. [0003] The manufacturing methods of superabsorbent resin mainly include aqueous solution polymerization method and reverse phase suspension polymerization method, among which the aqueous solution polymerization method is divided into belt process and kettle process. Because the superab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/02C08F220/06C08J3/24C08L51/00
CPCC08F265/02C08J3/245C08J2351/00C08F220/06
Inventor 赵帅丁明强马磊纪学顺邓俊英孙家宽
Owner WANHUA CHEM GRP CO LTD
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