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Preparation of super absorbent resin

A technology of superabsorbent resin and ice-water bath, which is applied in organic chemistry and other fields, can solve the problems of high product cost, low water absorption multiple, and poor salt resistance, and achieve the effects of increasing farmers' income, increasing water absorption, and reducing consumption

Inactive Publication Date: 2008-11-12
内蒙古永业生物技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although my country has achieved certain results in the research of superabsorbent resins, compared with foreign countries, there is still a considerable gap, such as low water absorption of resins, poor salt resistance, low gel strength after water absorption, complex production processes, high product cost

Method used

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  • Preparation of super absorbent resin
  • Preparation of super absorbent resin
  • Preparation of super absorbent resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: Weigh 5.0g sodium hydroxide, measure 15.0ml deionized water, prepare 25% sodium hydroxide solution, and neutralize 30.0g (28.6ml) acrylic acid under the conditions of ice-water bath cooling and stirring. Weigh 5.0g of potato starch, measure 25.0ml of deionized water, mix well, gelatinize in a water bath at 65°C, cool to room temperature, add 80.4mg of potassium persulfate initiator and a solution of neutralized acrylic acid and its salt , under the protection of nitrogen, stirred at room temperature for half an hour to make it evenly mixed. At the same time, the heating rate was controlled to increase the temperature of the water bath slowly, so that the reaction was fully carried out, and the stirring was stopped when the temperature reached 90°C. Afterwards, gradually increase the temperature and when the temperature of the water bath is 90°C-100°C, continue heating to make it react within this temperature range for 1-2 hours, stop nitrogen flow, and coo...

Embodiment 2

[0021] Example 2: Weigh 8.3g of sodium hydroxide, measure 25.0ml of deionized water, prepare 25% sodium hydroxide solution, and neutralize 30.0g (28.6ml) of acrylic acid under the conditions of ice-water bath cooling and stirring. Weigh 5.0g of potato starch, measure 25.0ml of deionized water, mix well, gelatinize in a water bath at 66°C, cool to room temperature, add 78.6mg of potassium persulfate initiator and a solution of neutralized acrylic acid and its salt , under the protection of nitrogen, stirred at room temperature for half an hour to make it evenly mixed. At the same time, the heating rate was controlled to increase the temperature of the water bath slowly, so that the reaction was fully carried out, and the stirring was stopped when the temperature reached 90°C. Afterwards, gradually increase the temperature and when the temperature of the water bath is 90°C-100°C, continue heating to make it react within this temperature range for 1-2 hours, stop nitrogen flow, a...

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Abstract

The invention discloses a method for making super absorbent resin. The method comprises the following main technological processes that: acrylic acid is adopted to pass through a neutral aluminum oxide chromatographic column so as to remove polymerization inhibitor; sodium hydroxide and acrylic acid undergo neutralization reaction in ice-water bath, and potato starch is mixed with deionized water so as to carry out gelatinization; the neutralized acrylic acid and the salt solution of the acrylic acid are mixed with the gelatinized potato starch, and then initiator potassium persulphate is added in; the mixture is stirred evenly under the protection of nitrogen and then is heated to ensure that potato starch, acrylic acid and the salt of the acrylic acid undergo graft copolymerization reaction under the protection of nitrogen; then, the mixture undergoes heat-preservation reaction and then is dried and crushed so as to obtain the super absorbent resin. The super absorbent resin made by the method has excellent properties as well as greatly increased water-absorbing capacity as compared with similar products; the method takes potato starch as a raw material, thereby opening a path for the deep processing of farm products; moreover, the super absorbent resin can be used in disposable sanitary products, and can also change soil aggregate structure so as to increase soil water permeability and gas permeability; therefore, the super absorbent resin plays an important role in soil water conservation and desert control in arid areas.

Description

technical field [0001] The invention relates to a preparation method of a superabsorbent resin used in agriculture, forestry, animal husbandry, gardening and daily necessities, in particular to a method for synthesizing a superabsorbent resin with potato starch and acrylic acid as main raw materials. Background technique [0002] The excellent water absorption and water retention properties of superabsorbent resin make it widely used in many fields. Disposable diapers and other sanitary products are the earliest application fields for superabsorbent resins, and they are still the largest consumer market for superabsorbent resins. Adding superabsorbent resin to the soil can change the aggregate structure of the soil, increase the water permeability and air permeability of the soil, and store the added water. It has attractive effects in soil moisture retention and desert control in arid areas. prospect. Now Japan and France have used super absorbent resins in the Middle Eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F4/30C07C57/04C07C57/07
Inventor 温国华刘润花张玮琦李佳目仁更
Owner 内蒙古永业生物技术有限责任公司
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