Preparation method of temperature-responsive water-absorbing agent with ternary interpenetrating network structure
A technology of interpenetrating network structure and temperature response, which is applied in the field of preparation of temperature-responsive water-absorbing agents, can solve the problems of limited water absorption and dehydration performance, and achieve the effects of fast reaction, wide application prospect and large water absorption capacity.
Active Publication Date: 2017-10-24
BEIJING FORESTRY UNIVERSITY
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AI Technical Summary
Problems solved by technology
[0004] However, the water absorption and dehydration performance of the monomer prepared by a single water-absorbing agent is limited, and the addition of hydrophilic materials can improve the water-absorbing ability and dehydration efficiency of the water-absorbing agent
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0013] Example 1: Add 0.5020g N-isopropylacrylamide and 0.0502g γ-polyglutamic acid into 15mL deionized water, then add 0.0115g cross-linking agent N, N-methylenebisacrylamide, stir well, Add 0.5020g of polyethylene glycol, stir again, pass nitrogen gas for 30min, add 0.0115g of initiator ammonium persulfate and 40μL of accelerator N,N,N,N-tetramethylethylenediamine, and seal. React at room temperature for 2 hours. After the reaction is completely stopped, take out the water-absorbing agent, soak it in deionized water for 5 days, change the water every day, fully wash away unreacted monomers and other impurities, and dry it.
[0014] Soak the completely dried water-absorbing agent in deionized water, and measure its water-absorbing expansion ratio through the mass change of the water-absorbing agent. According to experiments, the temperature-responsive ternary interpenetrating network water-absorbing agent prepared by the technology of the present invention has a maximum water...
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Abstract
The invention relates to a preparation method of a novel temperature-responsive water-absorbing agent with a ternary interpenetrating network structure. The water-absorbing agent is mainly composed of temperature-responsive monomer N-isopropylacrylamide, γ-polyglutamic acid and polyethylene glycol with a molecular weight of about 4000 in an aqueous solution in which a crosslinking agent, an initiator and an accelerator exist. Under the condition of nitrogen protection, it is prepared by reacting at room temperature for 1-2 hours. In the ternary interpenetrating reaction, the mass ratio of N-isopropylacrylamide, γ-polyglutamic acid, and polyethylene glycol is controlled to be 10:1:10, and the addition amount of cross-linking agent and initiator account for a unit 1% to 5% of the total mass of the liquid, and the addition of the accelerator accounts for 0.3% to 1% of the total liquid. The water-absorbing agent prepared according to the present invention has a water absorption multiple of about 100, that is, each g of the water-absorbing agent can absorb 100g of water. The water-absorbing agent can be applied to many fields such as forward osmosis sludge dewatering and material separation.
Description
1. Technical field [0001] The invention relates to a preparation method of a temperature-responsive water-absorbing agent with a ternary interpenetrating network structure. 2. Background technology [0002] Environment-responsive water-absorbing agent is a rapidly developing polymer material. It is generally composed of covalent bonds, hydrogen bonds or van der Waals forces, and has good water absorption, and changes in physical structure and chemical properties may occur due to changes in the external environment after absorbing water. Environment-responsive water-absorbing agents mainly include pH-responsive water-absorbing agents, electric-responsive water-absorbing agents, temperature-responsive water-absorbing agents, etc. Among them, temperature-responsive water-absorbing agents can achieve dehydration performance only through a certain temperature change. Compared with other This type of water-absorbing agent has the advantages of low energy consumption, easy operati...
Claims
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IPC IPC(8): C08L33/24C08L77/04C08L71/02C08F220/54C08F222/38
Inventor 张立秋李菲吴言封莉
Owner BEIJING FORESTRY UNIVERSITY