Degradable gel cool storage agent and preparation method thereof

The technology of a cold storage agent and gel is applied in the field of cold storage agent and its preparation, which can solve the problems of harming the earth environment and non-degradation, and achieve the effects of avoiding thermal damage, maintaining low temperature and convenient operation.

Inactive Publication Date: 2012-06-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But many are non-degradable and endanger the earth's environment

Method used

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  • Degradable gel cool storage agent and preparation method thereof
  • Degradable gel cool storage agent and preparation method thereof
  • Degradable gel cool storage agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Raw materials: dry starch is used to prepare a starch solution with a mass fraction of 11%; the initiator is ammonium persulfate, and the quality is 3% of the dry starch mass, and it is prepared into a 10wt% ammonium persulfate initiator solution; the crosslinking agent is N, N'-methylenebisacrylamide, the quality is 0.5% of the dry starch mass, prepared into 10wt% N,N'-methylenebisacrylamide crosslinking agent solution; use 25% NaOH solution to adjust the pH of acrylic acid To 6, the mass ratio of acrylic acid to dry starch before adjustment is 1.8:1.

[0023] Preparation process: When the temperature of the constant temperature water bath rises to 55°C, add the prepared starch solution into the four-necked flask, add the ammonium persulfate initiator solution, stir for 40 minutes and then add the acrylic acid solution and N, which have adjusted the pH. N'-methylenebisacrylamide cross-linking agent solution, stirring for graft copolymerization for 70 minutes. Dry in a...

Embodiment 2

[0026] Raw materials: dry starch is used to prepare a starch solution with a mass fraction of 11.76%; the initiator is ammonium persulfate, and the quality is 4% of the dry starch mass, and it is prepared into a 10wt% ammonium persulfate initiator solution; the crosslinking agent is N, N'-methylenebisacrylamide, the quality is 0.83% of the dry starch mass, prepared into 10wt% N,N'-methylenebisacrylamide crosslinking agent solution; use 25% NaOH solution to adjust the pH of acrylic acid To 6.5, the mass ratio of acrylic acid to dry starch before adjustment is 2:1.

[0027] Preparation process: When the temperature of the constant temperature water bath rises to 60°C, add the prepared starch solution into the four-neck flask, add the ammonium persulfate initiator solution, stir for 35 minutes and then add acrylic acid and N,N '-methylenebisacrylamide crosslinking agent solution, stirring for graft copolymerization for 1h. Dry in an oven at 60°C until constant weight, and pulver...

Embodiment 3

[0030] Raw materials: dry starch is used to prepare a starch solution with a mass fraction of 13%; the initiator is ammonium persulfate, and the quality is 5% of the dry starch mass, and it is prepared into a 10wt% ammonium persulfate initiator solution; the crosslinking agent is N, N'-methylenebisacrylamide, the quality is 1.5% of the dry starch mass, prepared into 10wt% N,N'-methylenebisacrylamide crosslinking agent solution; adjust the pH of acrylic acid with 25% NaOH solution To 7, the mass ratio of acrylic acid to dry starch before adjustment is 2.3:1.

[0031] Preparation process: When the temperature of the constant temperature water bath rises to 65°C, add the prepared starch solution into the four-neck flask, add the ammonium persulfate initiator solution, stir and initiate for 30 minutes, then add the acrylic acid solution with adjusted pH and N, N'-methylenebisacrylamide cross-linking agent solution, stirring for graft copolymerization for 50 minutes. Dry in an ove...

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Abstract

Provided is a degradable gel cool storage agent. Components of the cool storage agent comprise starch acrylic acid graft copolymer and a phase transition cool storage material. The starch acrylic acid graft copolymer serves as a base material of the cool storage agent, and the phase transition cool storage material is absorbed in the starch acrylic acid graft copolymer so as to prepare the transparent gel cool storage agent. Adjustable phase transition temperature of the cool storage agent ranges from -4 to 0 DEG C. The phase transition cool storage material is water or NaCl water solution with concentration ranging from 0.5 to 5%. The invention further provides a preparation method of the cool storage agent. The cool storage agent is non-toxic, free of smell, non-corrosive, gel-shaped, hard to flow out to contaminate packaged products and capable of being biologically degradable.

Description

technical field [0001] The invention relates to the field of temperature-controlled packaging, in particular to a cold storage agent and a preparation method thereof. Background technique [0002] The current cold storage technology is mainly used in air-conditioning of buildings. With the development of technology, it is expected to expand its application range. The research and development of low-temperature cold storage technology in the application of temperature-controlled packaging has theoretical and practical significance. Traditional cooling agents are mainly wet ice and dry ice, and their phase transition temperatures are 0°C and -78°C, respectively. Their phase transition temperatures are not adjustable, so their applications are limited. Moreover, the melting of wet ice produces water, which requires additional water-absorbing materials; the sublimation of dry ice releases carbon dioxide gas, which will damage the product and packaging if it reaches a certain co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C08L51/02C08F251/00
Inventor 钱静顾正彪张芸李兆丰
Owner JIANGNAN UNIV
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