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A kind of synthetic method of water-absorbing resin

A technology for a water-absorbent resin and a synthesis method, which is applied to the synthesis field of water-absorbent resin, can solve the problems of low gel strength, water-absorbent resin pressure absorption rate, poor liquid permeability, low molecular cross-linking degree, etc., and achieves high gel strength. , The effect of good water retention capacity and high absorption rate

Active Publication Date: 2018-12-18
SHANDONG NUOER BIOLOGICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Water-absorbent resin is a polymer with a three-dimensional network structure. If the grid is large and the molecular freedom is large, the water absorption ratio will be higher. The pressure absorption rate and liquid permeability will also be relatively poor, so the water absorption rate and gel strength are a pair of contradictions that cannot be achieved at the same time. Most of the water-absorbent resins on the market currently have this problem.

Method used

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preparation example Construction

[0017] A method for synthesizing a water-absorbent resin. The method consists of raw materials in parts by weight: 200-300 parts by weight of acrylic acid, 1-5 parts of a crosslinking agent, 700-800 parts of deionized water, 0.5-2 parts of a redox initiator, and 50-50 parts of octanediol. 80, ethanol 10-80, butanediol diglycidyl ether 5-15, aluminum sulfate 20-40, silicon dioxide 2-5 and sodium hydroxide solution; its preparation method steps are as follows:

[0018] (1) After adding acrylic acid, deionized water and cross-linking agent into the reactor for mixing, pass nitrogen gas to remove oxygen, then add initiator to polymerize at a temperature of 20-25°C and raise the temperature naturally;

[0019] (2) The reaction is over if the temperature does not rise, and then kept at a temperature of 80-90°C for 90-150 minutes, and granulated to obtain resin colloidal particles;

[0020] (3) Resin colloid particles are added to sodium hydroxide solution, dried, crushed, and sieved...

Embodiment 1

[0030] Select the following raw materials in parts by weight: Acrylic acid 220, tetraallyloxyethane 1, deionized water 780, potassium persulfate 0.3, ascorbic acid 0.8, octane glycol 52, ethanol 40, butanediol diglycidyl ether 8, sulfuric acid Aluminum 24, silicon dioxide 2 and 48% sodium hydroxide solution 85.8; the specific preparation process is as follows:

[0031] (1) Add acrylic acid, deionized water, tetraallyloxyethane and blow high-purity nitrogen into the reactor; add potassium persulfate and ascorbic acid to initiate polymerization at 20-25°C and raise the temperature naturally;

[0032] (2) The reaction is considered as the end of the reaction when the temperature no longer rises. The temperature peak is about 85-90°C, and the temperature is kept at 82°C for 90 minutes. The reacted colloid is granulated to obtain resin colloid particles;

[0033] (3) The resin colloidal particles are neutralized by adding sodium hydroxide solution, drying the colloidal particles ne...

Embodiment 2

[0049] Select the following raw materials in parts by weight: Acrylic acid 250, trimethylolpropane triacrylate 1.2, deionized water 750, potassium persulfate 0.34, ascorbic acid 0.9, octane glycol 59, ethanol 40, butanediol diglycidyl ether 9, Aluminum sulfate 27.3, silicon dioxide 2.3 and 48% sodium hydroxide solution 97.5; the specific preparation process is as follows:

[0050] (1) Add acrylic acid, deionized water, trimethylolpropane triacrylate into the reactor and blow high-purity nitrogen gas; add potassium persulfate and ascorbic acid to initiate polymerization at 20-25°C and raise the temperature naturally;

[0051] (2) The reaction is considered as the end of the reaction when the temperature no longer rises. The temperature peak is about 85-90°C, and the temperature is kept at 82°C for 90 minutes. The reacted colloid is granulated to obtain resin colloid particles;

[0052] (3) The resin colloidal particles are neutralized by adding sodium hydroxide solution, drying...

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Abstract

The invention discloses a method for synthesizing a water-absorbing resin, which is characterized in that the method consists of the following parts by weight of raw materials: acrylic acid 200-300, crosslinking agent 1-5, deionized water 700-800, redox initiator 0.5 ‑2, caprylyl glycol 50‑80, ethanol 10‑80, butanediol diglycidyl ether 5‑15, aluminum sulfate 20‑40, silicon dioxide 2‑5 and sodium hydroxide solution. In the present invention, acrylic acid is firstly polymerized at room temperature, then neutralized by sodium hydroxide solution and subjected to surface cross-linking treatment three times to ensure that the water-absorbent resin has high gel strength, high pressure absorption capacity, and good liquid flow. Performance, good water retention capacity, fundamentally solve the contradiction between gel strength and absorption rate, and the synthesized water-absorbent resin performs very well in diapers, not only has a fast infiltration speed but also has ultra-low reflection Penetrating, ultra-dry top layer.

Description

technical field [0001] The invention relates to the field of polymerized functional polymer chemical additives, in particular to a method for synthesizing a water-absorbing resin. Background technique [0002] Water-absorbent resin is a polymer with a three-dimensional network structure. If the grid is large and the molecular freedom is large, the water absorption ratio will be higher. The pressurized absorption rate and liquid permeability will also be relatively poor, so the water absorption rate and gel strength are a pair of contradictions that cannot be achieved at the same time. Most of the water-absorbent resins on the market currently have this problem. At present, when water-absorbent resins are applied to daily hygiene products such as women's sanitary napkins, baby diapers, and adult incontinence diapers, especially when applied to baby diapers, the requirements for surface dryness are getting higher and higher. Contents of the invention [0003] The object of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/02C08K5/053C08K3/36C08F220/06C08F4/40C08J3/24
CPCC08F4/40C08F220/06C08J3/24C08J2333/02C08K3/36C08K5/053C08L33/02
Inventor 荣敏杰李振许永升于庆华荣帅帅
Owner SHANDONG NUOER BIOLOGICAL TECH
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