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Method for producing high absorptive resin

A technology of superabsorbent resin and production method, which is applied in the production process field of homopolymer of cross-linked water-soluble polymer monomer and superabsorbent resin, and can solve the problem of low production capacity, time-volume yield and low economy , The conversion rate of polymerization reaction is not high, the residual monomer content is high, etc., to achieve the effect of reducing the residual monomer content, increasing the water absorption rate, and reducing the polymerization temperature

Inactive Publication Date: 2004-10-27
KEYUAN PRODIVE POWER PROMOTION CENT OF PETROCHEM IND SHANDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, since the conveyor belt is flat, and the liquid reaction components have low viscosity and strong fluidity, only a thin layer of reaction material can be formed on the conveyor belt, and the thickness of the reaction material is only 0.5-2cm. The production capacity is limited, and the production capacity, time-volume yield and economy are relatively low
In order to reduce the fluidity of the liquid reaction material and increase its viscosity, U.S. Patent No. 4,857,610 adopts the method of adding a thickener in the liquid reaction material to increase the viscosity, but the addition of the thickener reduces the purity of the product
Moreover, due to the use of a single initiation system in the polymerization reaction in the prior art, the polymerization reaction carried out on the conveyor belt takes a long time and the maximum reaction temperature is high, even reaching above 100°C. The high temperature causes serious volatilization of the components of the monomer mixture. , which affects the operating environment, and the conversion rate of the polymerization reaction is not high, and the residual monomer content in the product is still high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In a container replaced with nitrogen, dissolve 100.0kg of acrylic acid in 150.0kg of deionized water, then add a solution consisting of 13.9kg of NaOH and 50.0kg of deionized water, 1.0kg of 10% N,N'-methylenebisacrylamide Aqueous solution, the air in which was replaced by nitrogen gas for about 30 minutes. The above liquid mixture, initiation system and 10.0kgSi0 2 The fine powder (Φ≤100μm) is continuously fed into the horizontal cylindrical mixing pre-polymerization reactor at a certain flow rate for mixing and pre-polymerization reaction, and the pre-polymerized product is fed into the groove formed by the baffle type conveyor belt at a flow rate of 2.0kg / min The container is further polymerized into a gel-like solid. The initiator system includes a low-temperature initiation redox system composed of 0.4kg dicumyl peroxide, 0.017kg ferrous sulfate, 0.34kg EDTA and 0.102kg sodium formaldehyde sulfoxylate and a 0.15kg azobisisobutyronitrile high-temperature initiator...

Embodiment 2-6

[0042] The operation method is the same as that in Example 1, except that the comonomers acrylamide, styrene, acrylonitrile, vinyl acetate, and hydroxypropyl methacrylate are added in an amount of 10.0 kg.

Embodiment 7-11

[0044] The operation method is the same as in Example 1, except that the alkaline neutralizing agent added is sodium carbonate, sodium bicarbonate, potassium hydroxide, potassium carbonate and ammonium bicarbonate respectively.

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PUM

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Abstract

A process for preparing high-hydroscopicitiy resin includes prepolymerization between monomers to be polymerized, trigger, system and cross-linking agent, and polymerizing to obtain gel-state solid product. Its advantages are high hydroscopicity (500-2000 g / g for deionized water), high water absorbing speed (less than 10 S) and high gel strength after the water is absorbed by it.

Description

technical field [0001] The invention relates to the field of polymer synthesis, in particular to a production process of a superabsorbent resin, in particular to a production method of a homopolymer and / or a copolymer of a cross-linked water-soluble polymerizable monomer. Background technique [0002] Superabsorbent resin is a functional polymer material with a wide range of applications. It can absorb pure water tens to thousands of times its own weight, and will not dehydrate under normal pressure. It has high water absorption rate, fast water absorption rate, and good water retention. , Even under pressure, it is not easy to dehydrate and other properties, so it is widely used in agriculture, forestry, horticulture, medicine, medical treatment, artificial organs, physiological hygiene, petroleum, chemical industry, building materials, environmental protection, food, artificial intelligence materials, sensitive materials, biochemical technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/00C08F2/44C08F4/04C08F4/40
Inventor 李留忠林亲敬于元章朱丽珺卢晓朱素贞
Owner KEYUAN PRODIVE POWER PROMOTION CENT OF PETROCHEM IND SHANDONG
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