Temperature-sensitive hydrogel water retaining agent , and preparation method and application thereof

A temperature-sensitive hydrogel and water-retaining agent technology, which can be used in applications, chemical instruments and methods, other chemical processes, etc., can solve the problems of single nature and function of water-retaining agents, difficult to popularize and apply on a large scale, and restricting the application of water-retaining agents. Achieve the effect of being conducive to wide-scale popularization and application, fast water absorption and water release rate, and excellent temperature sensitivity

Inactive Publication Date: 2018-05-11
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The absorption and release of water by the water-retaining agent caused by the change of ambient air pressure is often inconsistent with the law of water demand of plants, thus limiting the application of existing water-retaining agents
[0005] Most of the existing water retaining agents are relatively single in nature and function, and it is difficult to carry out large-scale promotion and application, so as to be suitable for different environments

Method used

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  • Temperature-sensitive hydrogel water retaining agent , and preparation method and application thereof
  • Temperature-sensitive hydrogel water retaining agent , and preparation method and application thereof
  • Temperature-sensitive hydrogel water retaining agent , and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present embodiment provides a kind of preparation method of thermosensitive hydrogel water retaining agent, it comprises the following steps:

[0026] At 20°C, add 3.5720g of 2-methyl-2-acrylic acid-2-(2-methoxyethoxy)ethyl ester and 0.1800g of polyethylene glycol methyl ether methacrylic acid to a 25mL beaker Esters (average molecular weight: 300), 0.0616g N,N'-methylenebisacrylamide and 15mL deionized water, after stirring for 20min with nitrogen gas, add 0.0200g initiator ammonium persulfate, continue stirring with nitrogen gas for 10min, Add 0.0400g of tetramethylethylenediamine to initiate the reaction, leave it sealed at 20°C, and react for 24 hours to fully polymerize; the reaction process for synthesizing the thermosensitive hydrogel is as follows: figure 1 shown;

[0027] Place the obtained white hydrogel polymer in a 50°C water bath to shrink and release water and pour it out, then add excess deionized water, and after fully swelling at 20°C, place it in ...

Embodiment 2

[0040] The present embodiment provides a kind of preparation method of thermosensitive hydrogel water retaining agent, it comprises the following steps:

[0041] At 20°C, add 3.6472g 2-methyl-2-acrylic acid-2-(2-methoxyethoxy)ethyl ester, 0.0600g polyethylene glycol methyl ether methacrylic acid to a 25mL beaker Esters (average molecular weight: 300), 0.0616g N,N'-methylenebisacrylamide and 15mL deionized water, after stirring for 20min with nitrogen gas, add 0.0200g initiator ammonium persulfate, continue stirring with nitrogen gas for 10min, Add 0.0400g of tetramethylethylenediamine to initiate the reaction, leave it sealed at 20°C, and react for 24 hours to fully polymerize;

[0042] Place the obtained white temperature-sensitive hydrogel polymer in a 50°C water bath to make it shrink to release water and pour it out, then add excess deionized water, fully swell at 20°C, place it in a 50°C water bath to make it Shrink again to release water. Repeated washing in this way f...

Embodiment 3

[0045] The present embodiment provides a kind of preparation method of thermosensitive hydrogel water retaining agent, it comprises the following steps:

[0046] At 20°C, 3.6848g of 2-methyl-2-propenoic acid-2-(2-methoxyethoxy)ethyl ester, 0.0616g of N,N'-methylenebis Acrylamide and 15mL deionized water were stirred with nitrogen gas for 20 minutes, then 0.0200 g of initiator ammonium persulfate was added, and after nitrogen gas flow was continued for 10 minutes, 0.0400 g of tetramethylethylenediamine was added to initiate the reaction. Seal and stand still, react for 24h to make it fully polymerized;

[0047] Place the obtained white temperature-sensitive hydrogel polymer in a 50°C water bath to make it shrink to release water and pour it out, then add excess deionized water, fully swell at 20°C, place it in a 50°C water bath to make it Shrink again to release water. Repeated washing in this way for 3 to 5 times to remove impurities such as incompletely reacted monomers and...

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Abstract

The invention discloses a temperature-sensitive hydrogel water retaining agent , and a preparation method and an application thereof. The water retaining agent is obtained through mixing and reactinga temperature-sensitive acrylate water-soluble polymerization monomer, an initiator, a crosslinking agent and / or a copolymerization monomer. The water retaining agent has the advantages of good temperature sensitivity, realization of spontaneous regulation of the water absorption and release behaviors according to the change of the extraneous ambient temperature, fast water absorption and releaserate, saving of a lot of water resources, adjustable properties, and facilitation of large-scale promotion, and is suitable for fields of desertification treatment, gardening, and agriculture and forestry. The preparation method has the advantages of simple flow, low energy consumption, no pollution, and suitableness for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of water-retaining agents, and in particular relates to a temperature-sensitive hydrogel water-retaining agent and its preparation method and application. Background technique [0002] Water retaining agent is a functional polymer material containing hydrophilic groups. It can quickly absorb water several times heavier than itself, and has the function of repeated water absorption. After absorbing water, it can slowly release water for plant absorption and utilization, thereby enhancing Soil water retention performance, improve soil structure, improve water use efficiency. [0003] In recent years, due to factors such as drought, environmental pollution, water shortage and national policy adjustments, water retaining agents have been widely used in many technical fields, especially in desertification control, horticulture, agriculture and forestry and other fields. prospect. [0004] The existing water-ret...

Claims

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Application Information

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IPC IPC(8): C08F220/28C08F222/38C09K17/22C09K105/00
CPCC09K17/22C08F220/28C09K2105/00C08F220/282C08F222/385C08F220/286
Inventor 刘阳张偲瑶张佩杨雯霏莫春香曾晨星袁超史亚娟
Owner NANHUA UNIV
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