Degradation-controllable superabsorbent resin and its preparation method

A technology of superabsorbent resin and polyether polyurethane, applied in chemical instruments and methods, physical/chemical process catalysts, soil conditioning materials, etc., can solve the problems of lack of controllable degradation

Active Publication Date: 2021-03-26
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problem of lack of degradation controllable superabsorbent resin in the prior art, and provide a degradation controllable superabsorbent resin and its preparation method

Method used

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  • Degradation-controllable superabsorbent resin and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation method of solid acid catalyst: firstly ZrOCl 2 ·8H 2 O was dissolved in distilled water, and the concentrated ammonia water with a concentration of 10 mol / L was slowly added under stirring, and the pH value was adjusted to 9 to form a gel, and then aged at room temperature until the upper layer solution was clear, suction filtered, and washed until no Cl - detected as Zr(OH) 4 , followed by Zr(OH) 4 Place in a 105 ℃ oven to dry for 20h, grind into fine powder, pass through a 120 mesh sieve to obtain solid powder, and then use dilute H with a concentration of 1.0mol / L 2 SO 4 After impregnation, suction filtration, drying the filter cake in an oven at 100 °C for 20 hours, and finally calcining at 650 °C for 1 hour, pulverizing it into fine powder, and passing through a 200-mesh sieve to obtain a solid acid catalyst.

Embodiment 2

[0047] The preparation method of solid acid catalyst: firstly ZrOCl 2 ·8H 2Dissolve O in distilled water, slowly add concentrated ammonia water with a concentration of 12 mol / L under stirring, adjust the pH value to 9.5, and form a gel, then age at room temperature until the upper layer solution is clear, filter with suction, and wash until there is no Cl - was detected, and Zr(OH) was obtained 4 , followed by Zr(OH) 4 Dry in an oven at 108°C for 22 hours, grind into a fine powder, pass through a 135-mesh sieve to obtain a solid powder, and then use dilute H with a concentration of 1.2mol / L 2 SO 4 After impregnation, filter with suction, dry the filter cake in an oven at 102°C for 22 hours, and finally roast it at 675°C for 2 hours, grind it into fine powder, and pass it through a 225-mesh sieve to obtain a solid acid catalyst.

Embodiment 3

[0049] The preparation method of solid acid catalyst: first ZrOCl 2 ·8H 2 Dissolve O in distilled water, slowly add concentrated ammonia water with a concentration of 13mol / L under stirring, adjust the pH value to 10, and form a gel, then age at room temperature until the upper layer solution is clear, filter with suction, and wash until there is no Cl - was detected, and Zr(OH) was obtained 4 , followed by Zr(OH) 4 Dry in an oven at 110°C for 24 hours, grind into a fine powder, pass through a 150-mesh sieve to obtain a solid powder, and then use dilute H with a concentration of 1.5mol / L 2 SO 4 After impregnation, filter with suction, dry the filter cake in an oven at 105°C for 24 hours, and finally roast it at 700°C for 3 hours, grind it into fine powder, and pass through a 250-mesh sieve to obtain a solid acid catalyst.

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Abstract

The invention relates to degradation-controllable super absorbent resin and a preparation method thereof. The whole resin is of a three-dimensional network structure, and is composed of a three-dimensional network matrix and slow-release degradation catalyst particles dispersed in the three-dimensional network matrix; a molecular chain of the three-dimensional network matrix is composed of an acrylic acid chain segment, a sodium acrylate chain segment, an acrylic acid-2-ethylhexyl ester chain segment, an acrylamide chain segment and a diacrylamide-terminated polyether polyurethane (cross-linking agent) chain segment; the slow-release degradation catalyst particles are a PBS-coated solid acid catalyst. The preparation method comprises the following steps that: with acrylic acid, sodium acrylate, acrylic acid-2-ethylhexyl ester, and acrylamide adopted as reaction monomers, diacrylamide-terminated polyether polyurethane as a cross-linking agent and slow-release degradation catalyst particles as an additive, polymerization reaction is carried out under the action of an initiator to prepare the degradation-controllable super absorbent resin. The method disclosed by the invention is simple; and the prepared resin is not degraded within 2-3 years and is completely degraded within 6 months after being used.

Description

technical field [0001] The invention relates to a method for preparing a degradable controllable superabsorbent resin, which belongs to the technical field of synthesis of functional polymer materials. Background technique [0002] Superabsorbent resin contains a large number of hydrophilic chemical groups in its molecular structure, such as carboxyl, hydroxyl, amide, sulfonic acid, etc. These groups make it form a three-dimensional network structure with a certain crosslinking density. This endows this kind of polymer material with unique water absorption and water retention characteristics, and it can absorb water equivalent to hundreds or even thousands of times its own weight. Superabsorbent resins are generally polymer electrolytes containing hydrophilic groups and cross-linked structures. Before absorbing water, the polymer chains are entangled with each other and cross-linked to form a network structure, so as to achieve overall fastening. When in contact with water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/06C08F220/56C08F220/18B01J27/053C09K17/40
CPCB01J27/053C08F290/067C08G2230/00C09K17/40C08F220/06C08F220/56C08F220/1808
Inventor 邹黎明许永静李文刚吉汪冲王荣誉冯依呈何钧炜孙晨凯
Owner DONGHUA UNIV
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