Preparation method of white and yellowing resistant water-absorbent resin

A technology of super absorbent resin and yellowing resistance, applied in the field of super absorbent resin, can solve the problems of easily violating the safety of sanitary products, and achieve the effect of improving initial whiteness and enhancing yellowing resistance.

Pending Publication Date: 2018-04-17
刘常红
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But such products are easy to violate the principle of hygiene product safety

Method used

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  • Preparation method of white and yellowing resistant water-absorbent resin
  • Preparation method of white and yellowing resistant water-absorbent resin

Examples

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preparation example Construction

[0073] The preparation method of the present invention is divided into two types: pre-neutralization method and post-neutralization method.

[0074]The pre-neutralization method is to first inject the acrylic acid aqueous solution into the reaction kettle with cooling and stirring devices, turn on the cooling water and the agitator, and slowly add the neutralizing liquid according to the total amount of the final neutralization degree of 70-80mol%, and control the neutralization. And heat release makes the material temperature lower than 40 ℃, the neutralization is carried out first, and then the internal crosslinking agent and reducing agent are added and mixed evenly. The mixed liquid is sent to the mixer to be fully mixed with the oxidant and other additives from another channel, and then flows to the polymerizer. After a few seconds, the free radical polymerization reaction initiated by the redox system occurs on the polymerizer to obtain a hydrogel; Extrusion and granulat...

Embodiment 1

[0078] A preparation method of a white, yellowing-resistant superabsorbent resin, comprising the following steps:

[0079] 1) Prepare polymerization grade refined acrylic acid, the content of polymerization inhibitor MQ is 138ppm; 200g.

[0080] 2) prepare neutralizing agent 45% sodium hydroxide aqueous solution, iron ion (as Fe 2 o 3 Total) content is 1ppm; 180g.

[0081] 3) Add 0.09 g of EDTA to 180 g of the above-mentioned neutralizing agent in a 45% aqueous sodium hydroxide solution, stir evenly, and prepare a neutralizing solution.

[0082] 4) Add the above-mentioned 200g of acrylic acid and 200g of deionized water into a 2000mL reaction flask equipped with a stirrer, a dropping funnel and a thermometer with a four-necked jacket, pass cooling water through the jacket of the flask, turn on the stirrer, and drip Add the above-mentioned neutralizing solution, and neutralize under the condition that the temperature of the material is controlled to be lower than 40°C; after...

Embodiment 2

[0084] With embodiment 1, difference is: acrylic acid polymerization inhibitor MQ content is 160ppm; Neutralizer 45% sodium hydroxide aqueous solution, iron ion (with Fe 2 o 3 meter) content of 2ppm.

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Abstract

The invention discloses a preparation method of a white and yellowing resistant water-absorbent resin. The preparation method is a pre-neutralization method or a post-neutralization method, wherein the pre-neutralization method comprises the following steps: adding acrylic acid into a neutralization solution to be neutralized, carrying out a radical polymerization reaction to obtain sodium polyacrylate and polyacrylic acid hydrogel of a certain neutralization degree, performing squeezing granulation on the hydrogel in the presence of a soluble reducing agent, and performing after-treatment toobtain a super absorbent resin; and the post-neutralization method comprises the following steps: carrying out a radical polymerization reaction on an aqueous solution of acrylic acid so as to obtainpolyacrylic acid gel, and adding a neutralization solution into the polyacrylic acid gel to carry out a neutralization reaction; and adding the soluble reducing agent to perform squeezing granulation,and performing after-treatment, thereby obtaining the super absorbent resin. According to the preparation method disclosed by the invention, the initial whiteness of the product can be effectively improved, and the yellowing resistance of the product can also be effectively enhanced.

Description

technical field [0001] The invention relates to the technical field of superabsorbent resins, in particular to a method for preparing a white and anti-yellowing water-absorbent resin, which can be used in sanitary products such as sanitary napkins, paper diapers, and sanitary napkins. Background technique [0002] Superabsorbent resin is a new type of functional polymer material with a three-dimensional network structure. It can absorb hundreds to thousands of times its own weight in deionized water, and can absorb dozens of times its own weight in 0.9% NaCl aqueous solution. It is swellable, has the ability to maintain a non-flowing state, and has a strong water retention capacity. It is difficult to overflow the absorbed water under certain pressurized conditions. In the field of hygienic materials, it is widely used in hygienic products such as baby diapers, adult incontinence products, women's hygienic products, water-absorbing agents in medical sanitary mattresses, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08F220/06C08F222/38C08F216/00C08F4/40
CPCC08F4/40C08F220/06C08J3/245C08J2333/26C08F222/385C08F216/00
Inventor 江毓铭江悦刘常红
Owner 刘常红
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