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A kind of preparation method of sodium polyacrylate composite material doped with modified calcium sulfate whiskers

A calcium sulfate whisker and sodium polyacrylate technology, which is applied in the field of composite materials, can solve the problems affecting the adsorption performance and achieve the effects of improving thermal stability, strong water adsorption ability, and enhanced compression resistance

Active Publication Date: 2021-05-14
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gel strength is an important index in the use of composite adsorption materials, which can usually be achieved by appropriately increasing crosslinking agents, introducing interpenetrating network polymers, doping inorganic particles, etc., but this will increase or decrease the crosslinking density of polymers, A tighter polymer network can significantly affect adsorption performance

Method used

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  • A kind of preparation method of sodium polyacrylate composite material doped with modified calcium sulfate whiskers
  • A kind of preparation method of sodium polyacrylate composite material doped with modified calcium sulfate whiskers
  • A kind of preparation method of sodium polyacrylate composite material doped with modified calcium sulfate whiskers

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Effect test

Embodiment 1

[0030] (1) The preparation method of modified calcium sulfate whiskers: Accurately weigh 0.5g of sodium tripolyphosphate, add 500mL of distilled water, and dissolve the solution in a water bath at 80°C to obtain sodium tripolyphosphate solution; accurately weigh Add 10.00g of calcium sulfate hemihydrate whiskers to sodium tripolyphosphate solution, heat in a water bath at 80°C, stir at 300rpm for 30min, then suction filter while hot, wash the filter cake with 80°C distilled water for 3 times, and bake in a microwave oven at high temperature Roast for 10 minutes, pulverize, and pass through an 80-100 mesh sieve to obtain the calcium sulfate whiskers modified by sodium tripolyphosphate;

[0031](2) The total mass of raw materials is 100%, in terms of mass percentage, including 15% of modified calcium sulfate whiskers, 81% of acrylic acid, 2% of initiator ammonium persulfate, and crosslinking agent N,N'-methylenebispropylene Acrylic acid ammonium 2%; Weigh the acrylic acid liquid...

Embodiment 2

[0035] (1) The preparation method of modified calcium sulfate whiskers: Accurately weigh 0.5g of sodium tripolyphosphate, add 500mL of distilled water, and dissolve the solution in a water bath at 80°C to obtain sodium tripolyphosphate solution; accurately weigh Add 10.00g of calcium sulfate hemihydrate whiskers to sodium tripolyphosphate solution, heat in a water bath at 80°C, stir at 300rpm for 30min, then suction filter while hot, wash the filter cake with 80°C distilled water for 3 times, and bake in a microwave oven at high temperature Roast for 10 minutes, pulverize, and pass through an 80-100 mesh sieve to obtain the calcium sulfate whiskers modified by sodium tripolyphosphate;

[0036] (2) The total mass of raw materials is 100%, in terms of mass percentage, including 2.5% to 20% of modified calcium sulfate whiskers, 76% to 93.5% of acrylic acid, 2% of initiator ammonium persulfate, and crosslinking agents N, N' -Methylenebisacrylamide 2%; Weigh the acrylic acid liquid...

Embodiment 3

[0042] Put a small amount of the modified calcium sulfate whisker-doped sodium polyacrylate composite material sample prepared in Implementation 1 into a sample tube and send it to the Analysis and Testing Center of Sichuan University of Light and Chemical Industry for comprehensive thermal analysis. (Integrated Thermal Analyzer: STA409PC from NETZSCH, Germany)

[0043] Figure 4 It is the TGA curve of the composite material. It can be seen from the figure that the weight of sodium polyacrylate decreases slowly from 56.6°C because a small amount of water in the material is losing, which is related to the fact that sodium polyacrylate is easy to absorb moisture in the air. The thermal weight loss was less than 40% before 432.5 ° C, and after 432.8 ° C, rapid decomposition occurred, the thermal weight loss was about 26.63%, and the residual ash at 649.4 ° C was 38.44%; sodium tripolyphosphate modified calcium sulfate whisker / poly Sodium acrylate has a thermal weight loss of l...

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Abstract

The invention discloses a method for preparing a sodium polyacrylate composite material doped with modified calcium sulfate whiskers. Ammonium persulfate 2%, N,N'-methylenebisacrylamide 2%; weigh acrylic acid, add NaOH solution in ice-water bath to neutralize, add N,N'-methylenebisacrylamide, add four In a four-necked flask, stir in a water bath at 55°C for 5-8 minutes; pour the weighed modified calcium sulfate whiskers into a four-necked flask, stir at 300-400rpm for 30-40min, and put the ammonium persulfate solution into the constant pressure funnel Place it on one mouth of a four-neck flask, seal the flask, pass nitrogen gas to drive out the air, drop ammonium persulfate solution into the flask, remove the air, slowly heat up to 65°C, stir for 18-20min, react for 1h, and take out the lump Dried, crushed, and passed through a 60-80 mesh sieve. In the invention, the modified calcium sulfate whiskers are doped into the sodium polyacrylate to increase the compressive modulus of the composite material and have good adsorption performance.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a method for preparing a modified calcium sulfate whisker-doped sodium polyacrylate composite material. Background technique [0002] Sodium polyacrylate (Polyacrylic acid sodium salt, sodium polyacrylate) is one of the acrylic fine chemical products developed at home and abroad in recent years. It has different uses according to the difference in relative molecular weight. It can be divided into low relative molecular weight polymerized sodium acrylate. (about 1000 ~ 5000kDa), mainly for dispersion; medium relative molecular mass (about 10 4 ~10 6 ), mainly plays a thickening role; high relative molecular mass (about 10 6 ~10 7 ), mainly for flocculation; ultra-high molecular weight sodium polyacrylate superabsorbent resin, mainly used as a water-absorbing agent. Sodium polyacrylate is widely used in the field of water-absorbing materials because of its rich network struct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F222/38C08F2/44C08K9/02C08K7/08C08L33/02
Inventor 谢云涛史云霄何萌陈永忠潘中才刘勇
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING