Preparation method of super absorbent polymer (SAP)

A super absorbent resin, the technology of preparation method, applied in chemical instruments and methods, applications, organic fertilizers and other directions, can solve the problems of energy consumption and manufacturing cost, complex manufacturing process, decreased applicability, etc., to achieve the best water absorption properties, increase The effect of simple process technology and production method

Active Publication Date: 2015-06-17
FORMOSA PLASTICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this kind of superabsorbent resin has the disadvantage that it is not easy to decompose in the soil.
[0004] It was once grafted and copolymerized with starch, cellulose derivatives, acrylic acid, acrylamide, and styrene, and then cross-linked with cerium sulfate or ammonium cerium sulfate to obtain a decomposable superabsorbent resin for agriculture and forestry. The disadvantages are that cerium sulfate is toxic, expensive and complicated to manufacture
[0005] Chinese patents CN 1912006A and CN 1912007A disclose a method of using humic acid, acrylic acid, starch and other materials to prepare a superabsorbent resin for agriculture and forestry. If the water absorption rate is too fast, the uniformity of mixing with the soil will decrease, resulting in a decrease in applicability; and the starch needs to be heated and gelatinized before it can be used, which consumes more energy and manufacturing costs
[0006] In addition, Chinese patent CN 101275004A discloses a method for manufacturing a water-retaining agent using attapulgite, humic acid, and acrylic acid as raw materials. Although inorganic soil is used to reduce costs, the overall water absorption rate of the inorganic soil is low due to the low water absorption rate. Poor; and this method requires secondary drying, which consumes more energy

Method used

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  • Preparation method of super absorbent polymer (SAP)
  • Preparation method of super absorbent polymer (SAP)
  • Preparation method of super absorbent polymer (SAP)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of the superabsorbent resin of embodiment 1 comprises the following steps:

[0034] (1) Take 10.42g of 48wt% sodium hydroxide aqueous solution and 0.77g of calcium hydroxide in a 100mL Erlenmeyer flask, then add 3g of starch (purchased from China Taiwan Weidan Enterprise Company) and 10g of deionized water and stir for 30 minutes , after starch gelatinization, add 3g acrylamide (purchased from China Taiwan Jingming Chemical Co., Ltd.) and 22.4g deionized water and stir for 30 minutes, then slowly add 30g acrylic acid (sourced from Taiwan Plastic Industry Co., Ltd. company) to neutralize to obtain a reaction monomer solution; wherein 35mol% of acrylic acid is neutralized into acrylate.

[0035] (2) Add 0.046 g of ethoxylated trimethylolpropane triacrylate (ethoxylated TMPTA) into the above reaction monomer solution and stir to obtain a reaction solution, and maintain its temperature at 20°C.

[0036] (3) Add 0.016g L-ascorbic acid, 0.2g sodium per...

Embodiment 2

[0040] In addition to changing the amount of sodium hydroxide aqueous solution and calcium hydroxide in this step (1) to 17.70g and 2.15g respectively (wherein 65mol% of acrylic acid is neutralized to acrylate), the preparation method of Example 2 and Example 2 1 is the same.

Embodiment 3

[0042] Except that the consumption of aqueous sodium hydroxide solution and calcium hydroxide of this step (1) is changed to 15.63g and 2.32g respectively (wherein the acrylic acid of 60mol% is neutralized as acrylate), and in the starch paste of this step (1) The preparation method of Example 3 was the same as that of Example 1, except that 3 g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS, purchased from Jingming Chemical Company, Taiwan, China) was additionally added after the reaction.

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Abstract

The invention provides a preparation method of a super absorbent polymer (SAP). The preparation method comprises the steps of mixing mixed alkali, water and starch, then mixing the mixture with an unsaturated monomer component to form reaction liquid, subjecting the reaction liquid to polymerization reaction, and drying the reaction liquid, wherein the unsaturated monomer component comprises a carboxyl-containing allyl monomer; the mixed alkali is a composition of an alkali metal compound and an alkaline earth metal compound; and the carboxyl-containing allyl monomer neutralized by the alkaline earth metal compound accounts for 5-15mol% of the carboxyl-containing allyl monomer. The preparation method has the beneficial effects that the water absorbability and degradation rate of the SAP prepared by the preparation method can be effectively increased; and plant growth is promoted.

Description

technical field [0001] The invention relates to a method for preparing a resin, in particular to a method for preparing a superabsorbent resin, which is suitable for technical fields such as agriculture and forestry. Background technique [0002] Superabsorbent resin is a polymer material with high water absorption and water retention. It has been widely used in agriculture, forestry, medical treatment, petroleum, chemical industry, building materials, food and other fields. Resins generally have problems such as high cost and few additional functions. [0003] The production method of superabsorbent resin for agriculture and forestry mostly uses unsaturated ethylenic monomers (such as acrylic acid, acrylamide, etc.) It is obtained after granulation, crushing, surface cross-linking, surface treatment and other procedures. But this kind of superabsorbent resin has the disadvantage that it is not easy to decompose in soil. [0004] It was once grafted and copolymerized with...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F220/58C09K17/40
Inventor 廖启松锺宏宗陈忠毅李政霖林郁珊
Owner FORMOSA PLASTICS CORP
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