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A kind of sodium polyacrylate/nanocellulose crystal composite superabsorbent resin and its preparation method

A superabsorbent resin and nanocellulose technology, which is applied in the field of superabsorbent resin, can solve the problems that nanocellulose crystals cannot be uniformly and stably dispersed, bacterial cellulose whiskers are prone to agglomeration, and dispersion stability is not very good. , to achieve the effect of increasing the rate of water absorption or saline, easy implementation, and improved salt tolerance

Inactive Publication Date: 2019-05-28
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the nanocellulose crystals are produced by hydrolyzing cellulose with sulfuric acid, and the surface has sulfate groups (-OSO 3 － ), which is conducive to the stable dispersion of nanocellulose crystals in water; but if nanocellulose crystals are added to a strong electrolyte aqueous solution, flocculation may occur and cannot be uniformly and stably dispersed
Huang Yang et al. (Acta Polymer Sinica, 2013, 9:1183–1189) prepared bacterial cellulose whiskers / poly(acrylic acid-acrylic acid-acrylamide) by in-situ polymerization of bacterial cellulose whiskers and sodium acrylate / acrylic acid / acrylamide mixed monomer Amide) composite superabsorbent resin, it is found that only when adding a small amount of (0.05wt%) bacterial cellulose whiskers, the water absorption and saline multiples of the resin can be improved; the reason is mainly because the bacterial cellulose whiskers are added to sodium acrylate / Acrylic acid / acrylamide mixed monomer dispersion stability in the aqueous solution is not very good, bacterial cellulose whiskers tend to agglomerate when the added amount is slightly larger, which reduces the water absorption performance of the resin
It is precisely because nanocellulose crystals cannot be uniformly and stably dispersed in sodium acrylate / acrylic acid mixed monomer aqueous solution (see figure 1 (a)), there is currently no report of in-situ polymerization of nanocellulose crystals or modified nanocellulose crystals with sodium acrylate / acrylic acid mixed monomers to prepare nanocomposite superabsorbent resins

Method used

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  • A kind of sodium polyacrylate/nanocellulose crystal composite superabsorbent resin and its preparation method
  • A kind of sodium polyacrylate/nanocellulose crystal composite superabsorbent resin and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1. Preparation of nanocellulose crystals

[0027] Evenly disperse 7g of microcrystalline cellulose in 100mL of sulfuric acid with a mass concentration of 64%, then stir and react at 45°C for 1.5 hours; After repeated washing with water for 4 times, a paste is obtained, wherein the content of nanocellulose crystals is about 10 wt%.

[0028] 2. Preparation of nanocellulose crystal-g-polyacrylamide

[0029]Disperse an appropriate amount of the above-mentioned nanocellulose crystal paste in deionized water to obtain 100 mL of a solution with a concentration of 1% g / mL, and adjust the pH value of the solution to 2 with nitric acid; then pass nitrogen gas for 30 minutes to discharge the air, and add 0.33g of ammonium cerium nitrate, stirred for 10 minutes, then added 3g of acrylamide, and continued to react for 4 hours under nitrogen atmosphere. After the reaction is complete, put the product into a dialysis bag and dialyze to remove unreacted acrylamide and other substance...

Embodiment 2

[0034] 1. Preparation of nanocellulose crystals

[0035] The preparation of nanocellulose crystals in this example is the same as in Example 1.

[0036] 2. Preparation of nanocellulose crystal-g-polyacrylamide

[0037] The preparation of nanocellulose crystal-g-polyacrylamide in this example is the same as that in Example 1.

[0038] 3. Preparation of sodium polyacrylate / nanocellulose crystal composite superabsorbent resin

[0039] In an ice-water bath, 10 g of acrylic acid was neutralized to a neutralization degree of 60% with an aqueous solution of sodium hydroxide with a concentration of 20% g / mL, and after cooling, an appropriate amount of water was added, and the nanocellulose crystal-g-polymer Acrylamide solution, crosslinking agent N,N'-methylenebisacrylamide, photoinitiator 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone, and stir to form a homogeneous solution , so that the concentration of acrylic acid is 20% g / mL, the mass ratio of acrylic acid, nanocellulos...

Embodiment 3

[0042] 1. Preparation of nanocellulose crystals

[0043] The preparation of nanocellulose crystals in this example is the same as in Example 1.

[0044] 2. Preparation of nanocellulose crystal-g-polyacrylamide

[0045] The preparation of nanocellulose crystal-g-polyacrylamide in this example is the same as that in Example 1.

[0046] 3. Preparation of sodium polyacrylate / nanocellulose crystal composite superabsorbent resin

[0047] In an ice-water bath, 10 g of acrylic acid was neutralized to a neutralization degree of 60% with an aqueous solution of sodium hydroxide with a concentration of 20% g / mL, and after cooling, an appropriate amount of water was added, and the nanocellulose crystal-g-polymer Acrylamide solution, crosslinking agent N,N'-methylenebisacrylamide, photoinitiator 2-hydroxy-4'-(2-hydroxyethoxy)-2-methylpropiophenone, and stir to form a homogeneous solution , so that the concentration of acrylic acid is 20% g / mL, the mass ratio of acrylic acid, nanocellulos...

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Abstract

A sodium polyacrylate / nanocellulose crystal composite super adsorbent polymer is prepared from acrylic acid, nanocellulose crystal-g-polyacrylamide, a crosslinking agent N,N'-methylene bisacrylamide and a photoinitiator 2-hydroxyl-4'-(2-hydroxyethoxy)-2-methylpropiophenone in the mass ratio being 1: (0.005-0.04): (0.0001-0.0005): (0.02-0.04) through photopolymerization. A preparation method of the sodium polyacrylate / nanocellulose crystal composite super adsorbent polymer has the characteristics of being mild in reaction condition, convenient to operate and easy to implement. The sodium polyacrylate / nanocellulose crystal composite super adsorbent polymer has the water absorption capacity up to 1,200-3,000 g / g and normal saline absorption capacity up to 71-139 g / g. Meanwhile, the composite super adsorbent polymer has rich pore structures and contributes to increase of water or normal saline absorption rates. The invention discloses the preparation method of the composite super adsorbent polymer.

Description

technical field [0001] The invention belongs to the technical field of superabsorbent resins, and in particular relates to a sodium polyacrylate / nanocellulose crystal composite superabsorbent resin and a preparation method thereof. Background technique [0002] Superabsorbent resin is a functional polymer material that can absorb and retain hundreds to thousands of times its own mass, and is widely used in fields such as agriculture, forestry, industry, construction and sanitation. Sodium polyacrylate superabsorbent resin is an important synthetic superabsorbent resin, which has the advantages of simple synthesis process, high water absorption, good safety performance, stable product quality and no corruption, etc., and has been widely studied and applied. However, sodium polyacrylate superabsorbent resin also has disadvantages such as poor salt resistance, insufficient water absorption rate, and low strength after water absorption. These shortcomings must be overcome throug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/02C08L51/02C08F251/02C08F220/56
CPCC08F251/02C08L33/02C08L51/02C08F220/56
Inventor 李本刚范玉曼张严丹曹绪芝
Owner NANJING FORESTRY UNIV
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