Method of oreparing starch grafting type high water absorption resin by wave polymerization

A super absorbent resin, starch grafting technology, applied in the field of resin preparation, can solve the problems of low monomer concentration, large energy consumption, slow polymerization rate, etc., and achieve the effects of uniform material structure, high monomer conversion rate and energy saving.

Inactive Publication Date: 2005-08-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The disadvantages of the traditional method are low monomer concentration, slow polymerization rate, low equipment utilization and production capacity; long-term feeding of nitrogen and continuous heating lead to high production costs and large energy consumption
[0005] Patents CN1431238A and CN1468866A have improved the traditional method, and prepared superabsorbent resin by high-temperature tunnel film polymerization method and one-step synthesis method respectively. The preparation process does not require nitrogen protection, but continuous heating is still required, and the e

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: a kind of one-end closed metal, plastics or glassy cylindrical container, its internal volume 100 milliliters, this container is used as reactor; Add 40 milliliters of water in 3 grams of dry potato starch, heat on the water bath of 60 ℃ Gelatinization into a transparent paste; 15 grams of acrylic acid monomers are neutralized to pH 7 with 30% (percentage by weight) sodium hydroxide solution, mixed with gelatinized starch, added 5 grams of acrylamide, 1 gram of maleic acid, 0.004 Gram N, N-methylenebisacrylamide, 0.5 gram ammonium persulfate; After stirring and mixing evenly, pour into the reactor, heat at any end of the reactor with a resistance wire to decompose the initiator by heat; after the reaction starts, remove the heat source, The reaction is maintained by the exotherm of polymerization until all monomers throughout the reactor are completely converted to polymer gel. After the reactor was naturally cooled to room temperature, the gel was taken o...

Embodiment 2

[0022] Embodiment 2: same as embodiment 1, add 50 milliliters of water in 4 grams of dry potato starch, gelatinize; Acid, 0.8 gram cerium ammonium nitrate, 0.005 gram polyethylene glycol, the water absorption rate of this product is 630g / g.

Embodiment 3

[0023] Embodiment 3: same as embodiment 1, add 50 milliliters of water in 4 grams of dry potato starch, heat gelatinization; 10 grams of acrylic acid monomers are neutralized to pH 7 with sodium hydroxide, add 3 grams of acrylamide, Lactic acid, 0.4 gram of ammonium persulfate-sodium sulfite redox initiator, 0.025 gram of ethylene glycol, the water absorption rate of this product is 520g / g.

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Abstract

A process for preparing starch grafted high-hydroscopicity resin in liquid phase system by wave polymerizing method includes mixing starch with water, water-bath heating while gelatinizing, neutralizing acrylic acid by sodium hydroxide, mixing it with the gelatinized starch, adding acrylamide, maleic acid, trigger, cross-linking agent, and additive, stirring, loading the mixture in cylindrical reactor, heating to trigger reaction, removing heat source, and polymerizing reaction by automatic transfer of heat waves.

Description

technical field [0001] The invention belongs to the technical field of resin preparation, and in particular provides a method for preparing starch-grafted superabsorbent resin by wave polymerization. The prepared resin has biodegradability and can be used to produce sanitary napkins, paper diapers and agricultural soil conditioners, etc. . Background technique [0002] Water-absorbent resins are widely used in personal hygiene products, soil water-retaining agents, dehydrating agents, sludge coagulants, thickeners, anti-coagulation agents, and release control agents for various chemicals. The raw materials used in the preparation of water-absorbent resins are usually ethylenically unsaturated monomers with hydrophilic groups, such as acrylic acid, acrylamide and the like. Grafting and modifying starch with vinyl monomers to prepare water-absorbent resins can not only reduce the dependence on petroleum products and reduce the cost of raw materials, but also make the prepared...

Claims

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Application Information

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IPC IPC(8): C08F2/46C08F251/00C08K5/06
Inventor 葛昌纯燕青芝
Owner UNIV OF SCI & TECH BEIJING
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