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Preparation method of cross-linked polyacrylic acid large-particle-size bead water absorbent resin

A technology of water-absorbent resin and polyacrylic acid, which is applied in the field of preparation of water-absorbent resin, can solve the problems of low water-absorption rate of water-absorbent resin, lack of bead-shaped particles, uncontrollable size, etc., and achieve easy control of reaction temperature, low production cost, The effect of simple preparation method

Inactive Publication Date: 2019-05-21
济南华迪工贸有限公司
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Problems solved by technology

The aqueous solution polymerization method has short process, simple operation and low cost, but the product generally needs to be pulverized and post-processed, and regular bead-shaped particles cannot be obtained; the traditional reversed-phase suspension polymerization method needs mechanical stirring to prevent the monomer from agglomerating, and the obtained product also has The particle size is small, uneven, and the size is uncontrollable, and the water absorption rate of the prepared water-absorbent resin is not high

Method used

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  • Preparation method of cross-linked polyacrylic acid large-particle-size bead water absorbent resin

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Embodiment

[0022] Example: such as figure 1 Shown, the present invention provides a kind of preparation method of crosslinked polyacrylic acid type large particle size bead-shaped water-absorbing resin, it comprises the following steps:

[0023] 1) Preparation of solution A: After adjusting the temperature to 24°C-29°C of an aqueous solution of acrylic acid and / or its salt with a neutralization degree of 60-80% and a mass concentration of 30-45%, add acrylamide, oxidant and Mixing agent, stir and dissolve until the aqueous solution is clear and transparent, adjust the temperature to 8°C-18°C, and obtain solution A for later use; the amount of acrylamide is 100%-350% of the mass of acrylic acid monomer, and the oxidizing agent is ammonium persulfate or persulfate Potassium sulfate, the consumption is 0.10%-0.29% of the mass of the acrylic acid monomer, and the crosslinking agent is N,N-methylenebisacrylamide, the consumption is 0.04%-0.10% of the mass of the acrylic monomer;

[0024] 2) ...

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Abstract

The invention discloses a preparation method of cross-linked polyacrylic acid large-particle-size bead water absorbent resin. The preparation method comprises the following steps: preparing a solutionA, stirring, polymerizing, and obtaining water absorbent resin. The preparation method of the invention is simple, the raw materials are easily available, the production cost is low, the reaction temperature is easy to control, and the residual amount of monomers is low; the water absorption performance of the prepared water absorbent resin is obviously improved; the solvents with low density aremixed to form an organic continuous phase with the density equivalent to that of the monomer solution; and an oxidation-reduction initiation system is adopted for rapid initiation, so that the generated particles can be in a 'natural suspension' state, and the polyacrylic acid large-particle bead water absorbent resin with a particle size of millimeter-level can be synthesized in one step.

Description

technical field [0001] The invention relates to a method for preparing a water-absorbing resin, in particular to a method for preparing a cross-linked polyacrylic acid bead-shaped water-absorbing resin with a large particle size. Background technique [0002] Water-absorbing resin (Super Absorbent Polymer, SAP) is a new type of functional polymer material. It has many unique properties, not only the ability to absorb water hundreds or even thousands of times its own weight, but also fast water absorption, good water retention, large expansion force, strong gelling force, and strong thickening and viscosifying properties. Due to the cross-linked structure of macromolecules, it is difficult to separate water even under pressure, and it is elastic. Therefore, it is widely used in medical and health, industrial and agricultural production, civil construction, food industry, sewage treatment and other fields. [0003] At present, the synthesis methods of polyacrylic acid water-...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F222/38C08F4/40C08F6/00
Inventor 不公告发明人
Owner 济南华迪工贸有限公司
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