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Preparation of high hydroscopic resin by reversed phase microemulsion process

A technology of superabsorbent resin and reverse microemulsion, which is applied in the field of preparation of superabsorbent resin by reverse microemulsion method, can solve the problems of small product particle size, polymer flocculation, high cost, etc., and achieve no flocculation and precipitation, polymerization The effect of stabilizing the process and improving production efficiency

Inactive Publication Date: 2009-07-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product produced by inverse emulsion polymerization has small particle size, large specific surface area, and fast water absorption, but the particles are easy to agglomerate and flocculate, resulting in unstable polymerization
Photopolymerization method to synthesize superabsorbent resin, although it has the characteristics of simple process, short reaction time, can be carried out at room temperature, and no three waste pollution, etc., but the cost is high, special photopolymerization reaction device is required, and it is not easy to promote in a large area
[0005] Compared with the above-mentioned methods, the inverse microemulsion polymerization reaction speed is fast, and the polymerization reaction process is stable, and it is expected to obtain a super absorbent resin with small particle size, large specific surface area, and fast water absorption speed, and can fundamentally solve the problem of general inverse emulsion. The latex in the polymerization method is unstable and prone to polymer flocculation, gel and particle size distribution are too wide, but there are few reports about this method, and the influence of polymerization parameters and polymer structure on the performance of superabsorbent resin little research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] React 30% acrylic acid with 20% NaOH solution in an ice bath for 0.3-2 hours, so that the neutralized acrylic acid accounts for 70% of the added acrylic acid. Then add 20% acrylamide, 0.05% N,N-methylene bisacrylamide and 0.5% ammonium persulfate to the above system, stir and dissolve thoroughly to obtain a transparent solution. In addition, add 100mL cyclohexane, 10g OP-10 and SDS composite surfactant (mass ratio OP-10:SDS=2:1) ​​into the three-necked beaker equipped with condenser tube, stirring paddle and constant pressure dropping funnel Stir well. Add the above transparent solution into a three-necked flask to form a transparent inverse microemulsion with cyclohexane and composite surfactant, then put it into a constant temperature water bath magnetic stirring pot and raise the temperature to 75°C to react for 2-3h, after inverting The microemulsion is copolymerized into a porous micro-crosslinked superabsorbent resin. Filter the synthesized superabsorbent resin,...

Embodiment 2

[0024] React 30% acrylic acid with 20% NaOH solution in an ice bath for 0.3-2 hours, so that the neutralized acrylic acid accounts for 75% of the added acrylic acid. Then, 25% of acrylamide, 0.08% of N,N-methylenebisacrylamide and 0.8% of ammonium persulfate were added to the above system, stirred and dissolved to obtain a transparent solution. In addition, 100mL cyclohexane, the composite surfactant of 15g Span80 and Tween 80 (mass ratio Span80:Tween=3:1) are added in the there-necked flask that condenser tube, stirring paddle and constant pressure dropping funnel are housed, stir evenly . Add the above transparent solution into a three-necked flask to form a transparent inverse microemulsion with cyclohexane and composite surfactant, then put it into a constant temperature water bath magnetic stirring pot and raise the temperature to 75°C to react for 2-3h, after inverting The microemulsion is copolymerized into a porous micro-crosslinked superabsorbent resin. Filter the s...

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Abstract

The invention relates to a method for preparing acrylic acid-acrylamide (PAA-AM) high absorbent resin by synthesis with a reversed-phase micro-emulsion polymerization method; the preparation method comprises the following steps of: taking cyclohexane as a continuous phase, water as a dispersed phase, N, N'-methylene double acrylamide as crosslinker, ammonium persulfate (APS) as initiator, using anionic-non-ionic compound surfactant and non-ionic-non-ionic compound surfactant, acrylic acid and acrylamide as a raw material monomer, and the acrylic acid-acrylamide (PAA-AM) high absorbent resin is synthesized with the reversed-phase micro-emulsion polymerization method. Compared with the conventional reversed-phase suspension polymerization and reversed-phase emulsion polymerization, the method for preparing acrylic acid-acrylamide (PAA-AM) high absorbent resin by synthesis with the reversed-phase micro-emulsion polymerization method has the advantages of steady polymerization process, non-flocculation and precipitation-free generation, high reaction rate, and short reaction time, and can greatly improve the production efficiency. The acrylic acid-acrylamide (PAA-AM) high absorbent resin with the reversed-phase micro-emulsion polymerization method which is prepared by the method is a light yellow gel solid or granular solid, has high water and salt absorption rate, high requirement for the water-holding capacity of the soil, and the pH value of not more than 7 of the obtained high absorbent resin, and can be directly used in industries such as agriculture, forestry, and the like.

Description

1. Technical field [0001] The invention relates to using cyclohexane as the continuous phase, water as the dispersed phase, N, N'-methylenebisacrylamide as the crosslinking agent, ammonium persulfate (APS) as the initiator, and anion-nonion composite surface active Agent and nonionic-nonionic composite surfactant, acrylic acid and acrylamide as raw material monomers, polyacrylic acid-acrylamide (PAA-AM) superabsorbent resin synthesized by inverse microemulsion polymerization. Adding a small amount of the superabsorbent resin prepared by the present invention into the soil can greatly improve the water retention of the soil, so it is suitable for water retention in agriculture, forestry and horticulture, soil improvement, afforestation, transformation of barren hills and desert greening in agriculture, forestry and other industries. 2. Technical background [0002] Super Absorbent Resin (SAR for short) is a new type of functional polymer material widely researched and develop...

Claims

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Application Information

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IPC IPC(8): C08F220/06C08F220/56C08F2/32
Inventor 万涛姚杰马小玲臧天顺
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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