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High-strength full-degradable lignin-based super absorbent resin and preparation method thereof

A super absorbent resin, lignin-based technology, applied in the field of high-strength fully degradable lignin-based super absorbent resin and its preparation, can solve the problems of poor mechanical strength, low degradability, high gel strength, etc. The effect of low cost, high toughness and simple process

Active Publication Date: 2020-12-08
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems of low degradability of existing superabsorbent resins and poor mechanical strength after water absorption, the purpose of the present invention is to provide a high-strength fully degradable lignin-based superabsorbent resin, which uses lignin raw materials to prepare high-strength and superabsorbent resins. Resin, degradable, high water absorption and high gel strength

Method used

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  • High-strength full-degradable lignin-based super absorbent resin and preparation method thereof
  • High-strength full-degradable lignin-based super absorbent resin and preparation method thereof
  • High-strength full-degradable lignin-based super absorbent resin and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A polyether-structured aldehyde-terminated hyperbranched crosslinking agent, used to prepare high-strength fully degradable lignin-based superabsorbent resin gel or resin, prepared through the following process:

[0050] (1) Add trimethylolpropane (10mmol), sodium methoxide (10mmol), and methanol (20mL) to a round-bottomed flask, heat and boil to reflux for 2 hours, and remove methanol under reduced pressure to obtain white sodium pentaerythritol powder;

[0051] (2) Add glycidyl alcohol (0.6mol) in the flask of step (1), heat to 110 DEG C under stirring, cationic ring-opening polymerization takes place, obtain glycidyl alcohol hyperbranched prepolymer;

[0052] (3) Add glyoxylic acid (0.5mol) and methanesulfonic acid (0.2g) into the flask of step (2), heat to 90°C, stir for 6 hours, cool down, add carbon tetrachloride for extraction, and depressurize the oil phase The aldehyde-terminated hyperbranched crosslinker is obtained after removing carbon tetrachloride.

[005...

Embodiment 2

[0060] A carboxyl-terminated hyperbranched crosslinking agent with a polyether structure, used to prepare high-strength fully degradable lignin-based superabsorbent resin gel or resin, prepared through the following process:

[0061] (1) Add pentaerythritol (10mmol), sodium methoxide (10mmol), methanol (20mL) into the round bottom flask, heat and boil under reflux for 2h, and remove methanol under reduced pressure to obtain white sodium pentaerythritol powder;

[0062] (2) Add glycidyl alcohol (0.5mol) into the flask, heat to 100°C under stirring, cationic ring-opening polymerization takes place, and obtain glycidol hyperbranched prepolymer;

[0063] (3) Add oxalic acid (0.5mol) methanesulfonic acid (0.2g) into the flask, heat to 60°C, stir for 12 hours, cool down, add carbon tetrachloride for extraction, and remove tetrachloride from the oil phase under reduced pressure After carbon, a carboxyl-terminated hyperbranched crosslinker is obtained.

[0064] A high-strength fully ...

Embodiment 3

[0071] An epoxy-terminated hyperbranched cross-linking agent with a polyether structure, used for the preparation of high-strength fully degradable lignin-based superabsorbent resin gel or resin, prepared through the following process:

[0072] (1) Add pentaerythritol (10mmol), sodium methoxide (10mmol), methanol (20mL) into the round bottom flask, heat and boil under reflux for 2h, and remove methanol under reduced pressure to obtain white sodium pentaerythritol powder;

[0073] (2) Glycidyl alcohol (0.5mol) is added into the flask, heated to 90°C under stirring, cationic ring-opening polymerization occurs, and a glycidol hyperbranched prepolymer is obtained;

[0074] (3) Add epichlorohydrin (0.5mol), tetrabutylammonium bromide (0.2g) into the flask, and add sodium hydroxide solution (0.1mol / L, 100mL) to adjust the alkaline environment, and heat to 70°C , stirring and reacting for 10 hours, cooling, adding carbon tetrachloride for extraction, removing carbon tetrachloride fro...

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Abstract

The invention relates to the technical field of super absorbent resin, and discloses high-strength full-degradable lignin-based super absorbent resin in order to solve the problems that super absorbent resin is low in degradability, poor in mechanical strength after absorbing water and the like. The lignin-based super absorbent resin is prepared from the following components, by weight: 100 partsof a lignin compound, 5-20 parts of a hyperbranched cross-linking agent, 0.01-0.1 part of a surfactant, 2.0-5.0 parts of a primary surface treating agent and 4-6 parts of a secondary surface treatingagent. The hyperbranched cross-linking agent is an aldehyde end group hyperbranched cross-linking agent with a polyether structure as a main chain, a carboxyl end group hyperbranched cross-linking agent, an amino end group hyperbranched cross-linking agent and an epoxy end group hyperbranched cross-linking agent. The resin prepared in the invention has a high swelling rate in pure water and normalsaline, still has high toughness and strength after absorbing water, has excellent degradation performance, and has a 90-day degradation rate of over 80% and a 270-day degradation rate of over 95% under the experimental conditions of simulating the bottom of a refuse landfill.

Description

technical field [0001] The invention relates to the technical field of high-performance hydrogel materials, in particular to a high-strength fully degradable lignin-based superabsorbent resin and a preparation method thereof. Background technique [0002] As a hydrophilic polymer with a three-dimensional cross-linked structure, superabsorbent resin can absorb a large amount of water and keep its original structure from being damaged, so it is widely used in tissue engineering, drug sustained release, personal care, etc. field. According to different sources of raw materials, superabsorbent resins can be divided into three types: starch-based, cellulose-based and synthetic-based. Among them, the synthetic-based superabsorbent resins represented by polyacrylic acid ionomers are the most researched and the most abundant. , a class of super absorbent resin with the largest output and fastest development. However, since its raw materials come from non-renewable petroleum resour...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/12C08J3/075C08J3/24C08L97/00C08L71/02C08G65/28
CPCC08J3/128C08J3/075C08J3/246C08G65/2609C08J2397/00C08J2471/02
Inventor 王旭陈思费俊豪马猛施燕琴何荟文刘文静吴宇晖
Owner ZHEJIANG UNIV OF TECH
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