Method for preparing water-absorbing resin by ultraviolet and gamma-ray radiation ionization technique

A technology of radiation ionization and water-absorbing resin, applied in the field of preparing water-absorbing resin by solution polymerization, can solve the problems of difficult to meet the comprehensive practical performance of the product, poor liquid permeability and dispersibility of the product, difficult to stabilize the product performance, etc. The effect of good sex and strong resistance to salt absorption

Active Publication Date: 2013-07-31
史学明
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Problems solved by technology

[0003] At present, the synthesis of superabsorbent resin mostly adopts the thermal polymerization method of adding initiator and crosslinking agent, and the polymerization of superabsorbent resin is a chemical reaction process from liquid to gel solid state. Due to the difficulty of stirring and heat transfer in the later stage, the product performance is difficult. Stablize
Although there are reports of ind

Method used

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  • Method for preparing water-absorbing resin by ultraviolet and gamma-ray radiation ionization technique
  • Method for preparing water-absorbing resin by ultraviolet and gamma-ray radiation ionization technique

Examples

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Embodiment 1

[0020] Put 30kg of acrylic acid into a neutralization kettle with a stirring and cooling device. The temperature of the cooling medium is controlled at 5-15°C. While stirring, add 23% by weight aqueous sodium hydroxide solution dropwise, and the neutralization temperature is controlled at 25°C. ~35°C, neutralize to pH 7, then add 1kg of methacrylamide, stir well until completely dissolved, then put it into a PE plastic bag, first place it in a UV light with a wavelength of 365nm and an illumination of 4000μw / cm2 Under the light source, irradiate for 60 minutes, the material liquid undergoes polymerization reaction to form an elastic gel, and the elastic gel after ultraviolet light polymerization is placed in a γ-ray nuclear radiation device with a radiation dose rate of 7kGy / h for irradiation, so that the irradiation dose reaches 10kGy. Then the elastic gel is crushed, dried, pulverized, sieved, and then treated with a surface treatment agent to obtain a white powder with high...

Embodiment 2

[0044] Put 30kg of acrylic acid into a neutralization kettle with a stirring and cooling device. The temperature of the cooling medium is controlled at 5-15°C. Under stirring, add a 20% by weight potassium hydroxide aqueous solution dropwise, and the neutralization temperature is controlled at 25°C. ~35°C, neutralize to pH 7, then add 3kg of acrylamide and 1kg of 2-acrylamide-2-methylpropanesulfonic acid, stir well until completely dissolved, then put it into a PE plastic bag, put it in The wavelength is 365nm, and the illumination is 5000μw / cm 2 Under the ultraviolet light source, it is irradiated for 90 minutes, and the material liquid undergoes polymerization reaction to form an elastic gel. The elastic gel after ultraviolet light polymerization is placed in a γ-ray nuclear radiation device with a radiation dose rate of 8kGy / h for irradiation, so that the irradiation The dose reaches 15kGy. Then the elastic gel is crushed, dried, pulverized, sieved, and then treated with a...

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Abstract

The invention relates to a preparation method of a water-absorbing resin, particularly a method for preparing a water-absorbing resin by an ultraviolet and gamma-ray radiation ionization technique. The method comprises the following steps: 1) neutralizing acrylic acid monomer with an alkali solution to a neutralization degree of 60-90%, adding functional monomer which accounts for 0.2-40 wt% of the acrylic acid monomer to prepare a neutralized solution of which the mass percentage of the total monomers is 30-60%, and adding into a transparent reaction vessel; 2) irradiating the neutralized solution in the transparent neutralized solution under an ultraviolet light source so that the neutralized solution is subjected to polymerization reaction to generate an elastogel; 3) putting the elastogel obtained in the step 2) in a gamma-ray nuclear radiation device of which the radiation dose rate is 0.3-10 kGy/h, and carrying out dynamic irradiation with a delivery system until the irradiation dose reaches 3-20 kGy; and 4) after carrying out crushing, drying, pulverization and screening on the elastogel obtained in the step 3), carrying out dispersity and permeability surface treatment with a surface treating agent to obtain the water-absorbing resin.

Description

technical field [0001] The invention relates to a method for preparing a water-absorbing resin, in particular to an aqueous solution of acrylic acid, acrylate, and functional comonomers, which is prepared by solution polymerization under the chemical effects of ultraviolet light source and γ-ray nuclear radiation ionization chemical effect Resin method. Background technique [0002] Superabsorbent resin refers to functional polymer synthetic materials whose water absorption rate is dozens or even thousands of times its own mass. It is because of its excellent water absorption and gel expansion properties that it is widely used in agriculture, forestry and gardening to save water in soil. Water retention and soil conditioning, medical and sanitary products (such as sanitary napkins, diapers, sanitary care mattresses, etc.), flood control and water blocking, building moisturizing and water sealing materials, cable water blocking, food preservation, daily chemicals, fire exting...

Claims

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Application Information

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IPC IPC(8): C08J3/00C08J3/28C08F220/06C08F220/56C08F220/58C08F2/10C08F2/48
Inventor 史学明
Owner 史学明
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