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Water-absorbent resin and preparation method thereof

A technology of resin and water absorption, applied in the field of preparation of superabsorbent resin polymer gel, can solve the problems of poor liquid permeability, high content of acrylic acid monomer, and unsatisfactory effect

Active Publication Date: 2015-05-27
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many reports on the polymerization of polymer water-absorbent resins. In order to improve the performance of the final product, major manufacturers have adopted many methods in the core polymerization section, such as increasing the polymerization temperature and increasing the radiation time of the polymerization section. Although It is said that it can achieve the characteristics of high reaction efficiency, but because the temperature is too high and the radiation time is too long, it has a certain negative impact on the product, resulting in reduced water retention and poor liquid permeability of the product.
[0005] For example, Chinese patents CN101050251A and CN101622065A all describe the preparation method of superabsorbent resin polymer gel, and prepare superabsorbent resin according to the conventional process of polymerization, slicing, drying, pulverization, and surface crosslinking, but due to the Imperfection leads to problems such as high residual acrylic acid monomer content and poor liquid permeability in the finished product. Although the product is modified by adding specific functional compounds in the process of polymerization and surface crosslinking, the effect is not very satisfactory

Method used

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  • Water-absorbent resin and preparation method thereof

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preparation example Construction

[0019] The preparation method of the water-absorbing resin of the present invention has the following steps:

[0020] (I) Add crosslinking agent and polymerization initiator to the alkaline aqueous solution of acrylic monomer

[0021] The acrylic monomer of the present invention is not particularly limited, and can be any acrylic monomer known in the art. Non-limiting examples thereof include, for example, acrylic monomer, methacrylic monomer, acrylic C 1-6 Alkyl ester monomers (such as methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, etc., preferably acrylic acid C 1-3 Alkyl ester monomer), methacrylic acid C 1-6 Alkyl ester monomers (such as methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, etc., preferably C methacrylate 1-3 Alkyl ester monomer), or a mixture of two or more of the above monomers.

[0022] The concentration of the acrylic monomer aqueous solution is not particularly limited, and may be any conventional con...

Embodiment 1

[0073] At 1m 3 Add 283kg of sodium hydroxide aqueous solution (32wt%) and 351kg of deionized water to the reaction kettle, turn on the stirring of the reaction kettle, slowly add 225kg acrylic acid dropwise, keep the temperature of the reaction kettle at 20-30°C, add 0.45 kg cross-linking agent polyethylene glycol diacrylate and 0.55 kg cross-linking agent polyethylene glycol glycidyl ether, then add 0.25 kg initiator ammonium persulfate, continue to stir, fill the reactor with nitrogen for 15 minutes, add 0.25 kg Sodium bisulfite, keep the reactor stirred for 5 minutes, keep the temperature of the reactor at 20-30°C, and continuously enter the above-mentioned materials at a flow rate of 34.5kg / hr on a continuous conveyor belt with a length of 6000mm and a width of 500mm for polymerization.

[0074] 1) Aggregation induction segment

[0075] The uniformly mixed polymerization reaction material passes through the microwave generator at the entrance of the polymerization reactor throu...

Embodiment 2

[0086] The preparation of the gel is the same as in Example 1. The difference is that the thickness of the prepared gel is about 30mm by increasing the feed amount of the polymer material, and the prepared gel is broken, dried, pulverized, and surface crosslinked to obtain The performance of the product is: acrylic acid residue is 80ppm, water retention capacity is 37g / g, liquid permeability is 22s.

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Abstract

The invention discloses a water-absorbent resin and a preparation method, the method comprises the following steps: 1)adding a cross-linking agent and a polymerization initiator in an acrylic acid monomer alkaline aqueous solution; 2)applying microwave to initiate a polymerization; 3)performing polymerization for 3-10 minutes at 100-140 DEG C, increasing the temperature of 10-30 DEG C and slaking for 10-20 minutes to obtain a polymer gel; 4)sprinkling water vapor on the surface of the polymer gel to obtain the water-absorbent gel, by metering weight of the polymerization material, wherein the water vapor amount is 1-3weight%; and 5)using microwave for irradiate the water-absorbent gel under temperature which is lower than water boiling temperature.

Description

Technical field [0001] The invention relates to a preparation method of a super absorbent resin polymer gel. The method of the present invention can increase the conversion rate of acrylic acid monomers in the polymerized gel, and improve the dryness of the gel, so that the residual acrylic acid monomers in the final product are reduced, the water retention capacity is improved, and the liquid permeability is improved. The invention also relates to the water-absorbing resin prepared by the method. technical background [0002] In recent years, super absorbent resin (SAP) has been widely used in the daily chemical field and industrial and agricultural fields. The daily chemical field is mainly in the field of sanitary materials, such as baby diapers, women’s sanitary napkins, adult incontinence products, hospital disposable mattresses, etc. Water-absorbing articles; industrial fields are mainly used in water-blocking cables; agricultural fields are mainly used for soil water rete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/28C08J3/24C08J3/075C08F220/06C08F2/46
Inventor 王月珍周柳茵季金华连旭刚马建学蒋兆飞
Owner SHANGHAI HUAYI NEW MATERIAL
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