Synthetic method for high-performance water-absorbent resin processed by electron beam irradiation

An electron beam irradiation and synthesis method technology, applied in the field of irradiation processing, can solve problems such as low gamma ray dose rate, product performance impact, safety risks, etc. Simple control, simple way to control the reaction effect

Active Publication Date: 2015-03-25
CGN DASHENG ELECTRON ACCELERATOR TECH
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AI Technical Summary

Problems solved by technology

[0004]The method of reverse suspension solution polymerization produces superabsorbent resin, which can obtain excellent product quality, but there are outstanding problems affecting its development: the use of a large amount of organic solvents , the process must be processed and recycled. Due to the flammability and explosion of the solvent, the operation of the process equipment is required to be very strict, and there is a danger of explosion and pollution to the environment.
The dose rate of γ-rays produced by 60Co is low, and there are also great risks in safety. Therefore, the above disadvantages can be overcome by using high-energy electron beam irradiation
[0018] The radiation of microwave, ultraviolet light, and radioactive source [Co60] triggers the polymerization reaction of free radicals of monomers. Because of the long irradiation time required to reach a certain dose, the reaction efficiency is low, the heat of reaction is low and the polymerization is incomplete, and there are many residual monomers. Poor physical properties
There are also effects of dose rate changes on product performance in the process, etc.
[0019] To sum up, when the above-mentioned polymerization method initiates free radical polymerization of monomers, either a chemical initiator and heating and temperature control are required, or a long period of radiation is required. According to the accumulation of dose, there are many deficiencies in the reaction rate or physical property control

Method used

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  • Synthetic method for high-performance water-absorbent resin processed by electron beam irradiation

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preparation example Construction

[0039] The invention provides a method for synthesizing a high-performance water-absorbing resin processed by electron beam irradiation, comprising the following steps:

[0040](1) Add 20 to 80 parts by weight of polymerized monomers, 0.001 to 1 parts by weight of crosslinking agent, and 0.01 to 5 parts by weight of other additives into the reactor, and mix them uniformly to obtain a liquid to be polymerized, wherein the polymerized monomers It is acrylic acid or methacrylic acid with a neutralization degree of 50-90%. These two monomers have a wide range of sources, low prices, and high liquid absorption ratio; the secondary monomer is 2-acrylamide-2-methylpropanesulfonic acid , one of acrylamide, these two non-ionic double bond-containing monomers can quickly absorb physiological saline and enhance the pressure-resistant liquid absorption after liquid absorption; while the proportion of acrylic acid is higher than 80% is the preferred solution, and more It is beneficial to i...

Embodiment 1

[0068] (1) Put 1,000 parts of acrylic acid into a mixing tank, neutralize with 30% sodium hydroxide solution to a neutralization degree of 77%, add 50 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, add N,N- 2 parts by weight of methylene bis(meth)acrylamide, 1 part by weight of polyethylene glycol diacrylate, 10 parts by weight of sodium dodecylbenzenesulfonate, and 10 parts by weight of ethanol, and stir evenly to obtain a material solution to be polymerized;

[0069] (2) The material liquid prepared in (1) is transported by a chemical pump to the thinner to flow down, and irradiated by an electron beam parallel to the ground, so that the absorbed dose of the material liquid reaches 15kGy, and the gel sheet is obtained;

[0070] (3) Cut the gel plate obtained in (2) into 3mm small rubber particles by a cutting machine; dry at 80-180°C to obtain semi-finished granules.

[0071] (4) Add 100 parts of the semi-finished granules obtained in (3) to 5% surface cross-l...

Embodiment 2

[0073] (1) Put 1,000 parts of acrylic acid into a mixing tank, neutralize with 30% sodium hydroxide solution to a neutralization degree of 77%, add 50 parts by weight of 2-acrylamide-2-methylpropanesulfonic acid, add N,N- 3 parts by weight of methylene bis(meth)acrylamide, 0.3 parts by weight of polyethylene glycol diacrylate, 5 parts by weight of sodium lauryl sulfate, and 8 parts by weight of pentane, stirred evenly to obtain a material solution to be polymerized;

[0074] (2) The material liquid prepared in (1) is transported by a chemical pump to the thinner to flow down, and irradiated by an electron beam parallel to the ground, so that the absorbed dose of the material liquid reaches 12kGy, and the gel sheet is obtained;

[0075] (3) Cut the gel plate obtained in (2) into 3mm small rubber particles by a cutting machine; dry at 80-180°C to obtain semi-finished granules.

[0076] (4) Add 6% of the surface cross-linking solution to the semi-finished granules obtained in (3)...

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Abstract

The invention discloses a synthetic method for high-performance water-absorbent resin processed by electron beam irradiation. The synthetic method comprises the following steps: (1) adding 20-80 parts by weight of polymeric monomers, 0.02-5 parts by weight of monomers, 0.001-1 part by weight of a cross-linking agent and 0.01-5 parts by weight of other additives into a reaction kettle and uniformly mixing to obtain a polymeric feed liquid, wherein the polymeric monomers are acrylic acid with the neutralization of 50-90 percent; (2) placing the flowing polymeric feed liquid under radiation of electron beams emitted by an electron accelerator to obtain a water-absorbent gel; (3) cutting, drying, crushing and screening the water-absorbent gel to obtain semi-finished particles; (4) performing surface crosslinking treatment on the semi-finished particles to obtain the high-performance water-absorbent resin finished product. Electron beams produced by the industrial electron accelerator irradiate acrylic acid monomer solutions to enable the feed liquid to finish polymerization reaction at the flowing instant so as to synthesize the high-performance water-absorbent resin.

Description

technical field [0001] The invention relates to a method for synthesizing high-performance water-absorbing resin processed by electron beam irradiation, and belongs to the technical field of irradiation processing. Background technique [0002] High-performance water-absorbing resin refers to a functional polymer synthetic material whose water absorption rate is dozens or even thousands of times its own mass. Water conservation 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 protection Fire extinguishing and many other fields, and with the development of science and technology, its application range will be wider. [0003] In the polymerization reaction of synthesizing high-performance water-absorbent resins, most of the dominant synthetic routes and prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/58C08F222/38C08F2/46C08J7/12
Inventor 郑庆信肖峰苏春朱南康
Owner CGN DASHENG ELECTRON ACCELERATOR TECH
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