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Etherified-starch-grafted-copolymer super absorbent resin and preparation method thereof

A technology of superabsorbent resin and graft copolymer, which is applied in the field of preparation of new functional polymer materials to achieve mild reaction, improved salt resistance, and good stability

Active Publication Date: 2014-12-31
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Etherified-starch-grafted-copolymer super absorbent resin and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] 1. The raw material components used in this embodiment are as follows:

[0042] Starch (corn starch): 200 kg

[0043] Cationic etherification agent (3-chloro-2-hydroxypropyl-trimethylammonium chloride) 5 kg

[0044] Anionic etherification agent (chloroacetic acid) 5 kg

[0045] Monomer (acrylic acid / acrylamide, mass ratio 1:1): 186 kg

[0046] Additive (ascorbic acid): 0.2 kg

[0047] Initiator (potassium persulfate): 5 kg

[0048] Cross-linking agent (polypropylene glycol glycidyl ether): 0.8 kg

[0049] Surface treatment agent (sorbitol / magnesium oxide, mass ratio 3:1): 10 kg

[0050] Alkaline conditioner (sodium hydroxide): 30 kg

[0051] Water: 558 kg

[0052] 2. The preparation process steps and process parameters of this embodiment:

[0053] (1) Preparation of etherified starch: 200 kg of cornstarch, 374 kg of water, and 9.2 kg of sodium hydroxide solution with a mass fraction of 20% were added to the reactor, the pH of the system was about 10, and 25 kg o...

Embodiment 2

[0057] 1. The raw material components used in this embodiment are as follows:

[0058] Starch (sweet potato starch): 150 kg

[0059] Cationic etherification agent (N-(2,3-epoxypropyl)diethylamine) 3 kg

[0060] Anionic etherification agent (chloroacetic acid) 8 kg

[0061] Monomer (acrylic acid / 2-acrylamide-2-methylpropanesulfonic acid, mass ratio 3:1): 200 kg

[0062] Additive (sodium formate): 1 kg

[0063] Initiator (ammonium persulfate): 10 kg

[0064] Cross-linking agent (N,N-methylenebisacrylamide): 0.8 kg

[0065] Surface treatment agent (glycerol / silicon dioxide, mass ratio 4:1): 8 kg

[0066] Alkaline conditioner (potassium hydroxide): 50 kg

[0067] Water: 569.2 kg

[0068] 2. The preparation process steps and process parameters of this embodiment:

[0069] (1) Preparation of etherified starch: Add 150 kg of sweet potato starch, 278 kg of water, and 15 kg of potassium hydroxide solution with a mass fraction of 20% into the reactor. N-(2,3-epoxypropyl)diethyl...

Embodiment 3

[0073] 1. The raw material components used in this embodiment are as follows:

[0074] Starch (corn starch): 100 kg

[0075] Cationic etherification agent (N-(2,3-epoxychloropropyl)trimethylammonium chloride) 3 kg

[0076] Anionic etherification agent (chloroacetic acid) 4 kg

[0077] Monomer (ethyl acrylate / acrylamide, mass ratio 1:1): 400 kg

[0078] Additive (sodium D-gluconate): 1 kg

[0079] Initiator (ammonium persulfate): 30 kg

[0080] Cross-linking agent (polyethylene glycol): 3 kg

[0081] Surface treatment agent (polyethylene glycol / alumina, the mass ratio is 3:1): 12 kg

[0082] Alkaline conditioner (lithium hydroxide): 10 kg

[0083] Water: 437 kg

[0084] 2. The preparation process steps and process parameters of this embodiment:

[0085] (1) Preparation of etherified starch: Add 100 kg of cornstarch, 233 kg of water, and 8 kg of lithium hydroxide solution with a mass fraction of 20% to the reactor. The pH of the system is about 11.5. N-(2,3-epoxychlorop...

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Abstract

The invention discloses an etherified-starch-grafted-copolymer super absorbent resin and a preparation method thereof. The preparation method includes: subjecting starch serving as raw materials to double etherification, namely cationization and carboxymethylation under the action of etherifying agents; using prepared etherified starch for graft copolymerization; and washing, drying, crushing and performing surface treatment for an etherified-starch grafted copolymer, so that a white transparent granular product is obtained. A molecular chain of the super absorbent resin includes a carboxylic acid group and a quaternary ammonium group which are synergistic, so that the super absorbent resin is more complete and uniform in structure, an excellent network structure is more easily formed, salt tolerance of the copolymer is improved, and further, the super absorbent resin is superior in application performance. The super absorbent resin has diversified hydrophilic functional groups such as carboxymethyl, sulfonyl, quaternary ammonium group and acylamino, the water absorbency of the super absorbent resin is 700-1400g / g, and the saline water absorbency is 80-170g / g.

Description

technical field [0001] The invention belongs to the field of preparation methods of novel functional polymer materials, and in particular relates to an etherified starch graft copolymer superabsorbent resin and a preparation method thereof. Background technique [0002] Super absorbent polymer (SAP) is a new type of functional polymer material with strong water absorption and water retention. It presents a three-dimensional network in structure and contains strong hydrophilic groups such as carboxyl and hydroxyl groups. It can absorb water equivalent to hundreds or even thousands of times of its own weight, and it is not easy to press out with mechanical pressure, and has good water retention performance. At present, superabsorbent resins have been widely used in many fields such as sanitary materials, agricultural horticulture, industrial dehydrating agents, fresh-keeping agents, anti-fogging agents, and medical materials. There are many kinds of superabsorbent resins. Ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08L51/02C08F220/06C08F220/56C08F220/14C08F220/18C08F220/58C08B31/12
Inventor 刘明华郭佳龚洪秀
Owner FUZHOU UNIV
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