Preparation method of water-absorbing resin

A technology of water-absorbent resin and stearic acid, applied in the field of preparation of water-absorbent resin, can solve the problems of difficult temperature control and high production cost, and achieve the effects of low production cost, improved water absorption performance, and easy control of reaction temperature

Inactive Publication Date: 2015-07-22
广西藤县通轩立信化学有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method of water-absorbent resin, which can solve the problems of difficult temperature control and high production cost in the preparation process of existing water-absorbent resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The water-absorbent resin in this example uses 20 parts of methacrylic acid as a monomer, 30 parts of starch as a substrate, 0.5 parts of azobisisobutyronitrile as an initiator, and 0.2 parts of trimethylolpropane as a crosslinking agent. 35 parts of monoglyceride stearate is a dispersant.

[0014] The preparation method is: dissolve 30 parts by weight of starch with water to form a paste, transfer it to a reaction kettle, and then add 20 parts of methacrylic acid, 0.5 parts of azobisisobutyronitrile, 0.2 parts of trimethylol Propane and 35 parts of monoglyceride stearate were stirred evenly, and high-purity nitrogen gas was passed through, the reaction temperature was controlled at 55°C, the polymerization reaction was carried out for 3 hours, dried, and pulverized to obtain a water-absorbent resin.

[0015] In this example, the residual monomer content is 0.8%, and the tap water absorption capacity of the prepared water-absorbent resin is above 895 ml / g, and the absor...

Embodiment 2

[0017] The water-absorbent resin in this example uses 35 parts of methacrylic acid as a monomer, 10 parts of starch as a substrate, 1 part of azobisisobutyronitrile as an initiator, and 4 parts of trimethylolpropane as a crosslinking agent. 50 parts of stearic acid is a dispersant.

[0018] The preparation method is: dissolve the starch with a weight fraction of 10 in water into a paste, transfer it to the reactor, and then add 35 parts of methacrylic acid, 1 part of azobisisobutyronitrile, 4 parts of trimethylol Propane and 50 parts of stearic acid were stirred evenly, and high-purity nitrogen gas was passed through, the reaction temperature was controlled at 60°C, the polymerization reaction was carried out for 2 hours, dried, and pulverized to obtain a water-absorbent resin.

[0019] In this example, the residual monomer content is 1.2%. The tap water absorption capacity of the prepared water-absorbent resin is above 902 ml / g, and the absorption capacity of physiological sa...

Embodiment 3

[0021] The water-absorbent resin in this example uses 50 parts of methacrylic acid as a monomer, 50 parts of starch as a substrate, 3 parts of azobisisobutyronitrile as an initiator, 2 trimethylolpropane as a crosslinking agent, and 65 parts of Glyceryl tristearate is a dispersant.

[0022] The preparation method is: dissolve 50 parts by weight of starch with water to form a paste, transfer it to the reactor, and then add 50 parts of methacrylic acid, 3 parts of azobisisobutyronitrile, 2 parts of trimethylol Propane and 65 parts of glyceryl tristearate were stirred evenly, and high-purity nitrogen was passed through, the reaction temperature was controlled at 50°C, and the polymerization reaction was carried out for 4 hours, dried and pulverized to obtain a water-absorbent resin.

[0023] In this example, the residual monomer content is 1.3%. The tap water absorption capacity of the prepared water-absorbent resin is above 905 ml / g, and the absorption capacity of physiological ...

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PUM

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Abstract

The invention discloses a preparation method of a water-absorbing resin. The water-absorbing resin is characterized by using 20-50 parts of methylacrylic acid as a monomer, 10-50 parts of starch as a substrate, 0.5-3 parts of azodiisobutyronitrile as an initiator, 0.2-4 parts of trimethylolpropane as a crosslinking agent, and 35-65 parts of a stearic acid compound as a dispersing agent. The preparation method comprises the following steps: adding water into the starch to be dissolved so as to be pasty, transferring the pasty starch into a reaction kettle, adding methylacrylic acid, azodiisobutyronitrile, trimethylolpropane and the stearic acid compound to the reaction kettle, mixing uniformly, introducing high-purity nitrogen, controlling the reaction temperature, performing a polymerization reaction, drying and crushing. The preparation method disclosed by the invention is simple, accessible to raw materials, low in production cost, easy for controlling the reaction temperature, and low in monomer residual quantity; the water absorption capability of the prepared water-absorbing resin is obviously improved; the tap water absorption capability is up to 850 ml/g above, and the normal saline absorption capability is up to 100 ml/g or above.

Description

technical field [0001] The invention relates to the technical field of polymer compounds, in particular to a method for preparing a water-absorbing resin. Background technique [0002] Water-absorbing resin is a new type of functional polymer material. It has a high water-absorbing function of absorbing water hundreds to thousands of times heavier than itself, and has excellent water-retaining performance. The water separates out. Water-absorbent resin is non-toxic, non-irritating to the human body, has no side effects, and does not cause blood coagulation. In recent years, it has been widely used in the field of medicine. For example, it is used for external ointment with high water content and comfortable use; to produce medical bandages and cotton balls that can absorb surgical and traumatic bleeding and secretions, and prevent suppuration; Infectious artificial skin, etc. [0003] Most of the existing water-absorbent resins use cyclohexane as a dispersant. The disadva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08K5/053C08K5/103C08K5/09
Inventor 关炽昌刘涛
Owner 广西藤县通轩立信化学有限公司
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