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Super absorbent resin and preparation method thereof

A super absorbent resin, acrylic technology, applied in the field of water absorbent materials, can solve the problems of reducing the specific surface area and water absorption rate of the water absorbent resin

Pending Publication Date: 2022-01-11
兖矿水煤浆气化及煤化工国家工程研究中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This virtually reduces the specific surface area and water absorption rate of the water-absorbent resin

Method used

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  • Super absorbent resin and preparation method thereof
  • Super absorbent resin and preparation method thereof
  • Super absorbent resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0062] The present invention provides a kind of preparation method of superabsorbent resin, comprises the following steps:

[0063] a) mixing and heating the dispersion medium, the surfactant and the dispersant to obtain the base liquid;

[0064] b) mixing and heating the base liquid with the initiator-based mixed liquid A and the acrylic acid solution A to perform a primary polymerization reaction, and then distilling off part of the water to obtain a primary polymerization reaction liquid;

[0065] c) mixing and heating the initiator-based mixed liquid B and the acrylic acid solution B with the primary polymerization reaction liquid to carry out secondary polymerization reaction; after that, part of the water is distilled off, and then a cross-linking agent is added for post-cross-linking treatment; then, re-distilled processing, solid-liquid separation and drying to obtain spherical resin particles;

[0066] in:

[0067] The initiator-based mixed solution A includes: cros...

Embodiment 1

[0121] 1. Sample preparation

[0122] S1, preparation of acrylic acid solution:

[0123] Weigh 187.34g of analytically pure grade acrylic acid and place it in a 1L double-jacketed beaker, and dilute it with 44.5g of water to obtain 231.84g of acrylic acid aqueous solution with a mass fraction of 80%; slowly add sodium hydroxide solution (30% by mass fraction) The neutralization reaction is carried out in the above-mentioned acrylic acid solution, so that the neutralization degree of acrylic acid reaches 70%, and an acrylic acid solution is obtained. Divide the prepared acrylic acid solution into two parts according to the mass ratio of 1:2, and mark them as acrylic acid solution A and acrylic acid solution B respectively. Acrylic acid solution A and acrylic acid solution B were stored in cold water.

[0124] S2, preparation of base solution:

[0125] Take a 2L double-layer jacketed reactor with a stirring device, a temperature measuring device, a feed port, and an outlet va...

Embodiment 2

[0139] S1, preparation of acrylic acid solution:

[0140] Carry out according to the process of embodiment 1, difference is: adjust the addition amount of sodium hydroxide solution, make the neutralization degree of acrylic acid reach 65%; Acrylic acid solution A and acrylic acid solution B. Acrylic acid solution A and acrylic acid solution B were stored in cold water.

[0141] S2, preparation of base solution:

[0142] Take a 2L double-layer jacketed reactor with a stirring device, a temperature measuring device, a feed port, and an outlet valve outlet, use nitrogen to purge the reactor, and adjust the nitrogen flow rate to 0.1L / min, to ensure that the reactor is in an oxygen-free state.

[0143] Add 450mL of n-heptane dispersion medium, 0.8g of S-370 surfactant, and 1.20g of SDS dispersant into the reaction kettle, stir and mix at 300rpm, heat the material in the system through a circulating heating device, keep it at 50°C, and keep it at a constant temperature After 1....

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Abstract

The invention provides super absorbent resin and a preparation method thereof. The preparation method comprises the steps of: mixing and heating a dispersion medium, a surfactant and a dispersing agent to obtain a substrate solution; mixing the substrate solution with a certain amount of an initiator-based mixed solution A and an acrylic acid solution A, heating, carrying out primary polymerization reaction, and evaporating out part of water; and then mixing the substrate solution with a certain amount of an initiator-based mixed solution B and an acrylic acid solution B to carry out secondary polymerization reaction, then evaporating out part of water, and carrying out post-crosslinking, distillation treatment, solid-liquid separation and drying to obtain spherical resin particles. According to the preparation method, complete interface fusion or partial interface fusion among the spherical resin particles can be avoided, the particle size of the synthesized spherical resin particles can be controlled within a certain distribution range, meanwhile, the synthesized resin does not have a special shape, and the water absorption effect of the resin is improved.

Description

technical field [0001] The invention relates to the field of water-absorbing materials, in particular to a superabsorbent resin and a preparation method thereof. Background technique [0002] As a functional polymer material, superabsorbent resin is widely used in various sectors of the national economy such as baby diapers, sanitary products for women's menstrual period, agriculture, and food industry because of its two remarkable characteristics: high water absorption and high water retention. receive. [0003] Spherical polyacrylic acid resin particles are a widely used water-absorbing resin material. At present, the processes for preparing spherical polyacrylic acid resin particles mainly include water-soluble method and reverse-phase suspension method. Among them, the process of synthesizing polyacrylic acid spherical resin particles by the reverse suspension method has many advantages over the aqueous solution method, such as stable polymerization process, polymerizat...

Claims

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Application Information

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IPC IPC(8): C08F265/02C08F220/06C08L51/00C08K5/1515C08J3/24
CPCC08F265/02C08J3/24C08J2351/00C08K5/1515C08F220/06C08F2500/24
Inventor 张西标杨澜路文学李涛尹洪清刘峰王振华赵梅梅王红星刘莹乔波
Owner 兖矿水煤浆气化及煤化工国家工程研究中心有限公司