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SiO2 aerogel/fiber heat-insulation antibacterial composite packaging material and preparation method thereof

A composite packaging material and aerogel technology, applied in the field of packaging materials, can solve the problems of low strength, brittleness, inability to uniformly dope silica aerogel, etc., and achieves low cost, simple preparation process, and broad application prospects. Effect

Active Publication Date: 2021-09-24
福州大学至诚学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, plastic film is a kind of packaging material, and there is no plastic film doped with silica airgel at present. This is because the density of silica airgel powder is very small, and it will float when mixed with any solvent. On the surface of the solvent, the silica airgel cannot be evenly doped into the plastic film; on the other hand, because the silica airgel has low strength and is brittle, and the plastic film is extremely thin, this extremely Thin features can easily destroy the structure of silica airgel

Method used

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  • SiO2 aerogel/fiber heat-insulation antibacterial composite packaging material and preparation method thereof
  • SiO2 aerogel/fiber heat-insulation antibacterial composite packaging material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Step 1, mix tetraethoxysilane, water, absolute ethanol and 0.1mol / L hydrochloric acid in a molar ratio of 1:3:10:0.01, and then add aluminum silicate fibers with 1% tetraethoxysilane mass, Stir at room temperature and fully hydrolyze to obtain Sol A;

[0035] Step 2, put N-methylpyrrolidone and polyvinyl chloride into the reactor at a molar ratio of 1:5, and mix and stir at 170°C and 400r / min for 40min to prepare slurry B;

[0036] Step 3, mix sol A, slurry B and vanillin according to the mass ratio of 1:100:1 and place them in a freeze vacuum dryer, freeze at -10°C for 5 hours, and then freeze at -40°C and 20Pa Freeze for 16 hours to obtain a mixed solid, put the mixed solid into a twin-screw extruder, extrude and granulate it into a single-screw blow molding machine at a temperature of 130°C and a speed of 100r / min, and put it into a single-screw blow molding machine at a temperature of 170°C. Blow molding at a speed of 1000r / min to obtain SiO 2 Airgel / fiber thermal...

Embodiment 2

[0039] Step 1, mix tetraethoxysilane, water, absolute ethanol, and 0.05mol / L hydrochloric acid in a molar ratio of 1:10:50:0.1, and then add aluminum silicate fibers with 5% tetraethoxysilane mass, Stir at room temperature and fully hydrolyze to obtain Sol A;

[0040] Step 2, put N-methylpyrrolidone and polyvinyl chloride into the reactor at a molar ratio of 1:5, and mix and stir for 40 minutes at 180°C and 450r / min to prepare slurry B;

[0041]Step 3, mix sol A, slurry B and vanillin in a mass ratio of 0.5:100:0.5 and place them in a freeze vacuum dryer, freeze at -15°C for 5 hours, and then place them at -45°C and 20Pa Freeze for 16 hours to obtain a mixed solid, put the mixed solid into a twin-screw extruder, extrude and granulate it into a single-screw blow molding machine at a temperature of 150°C and a speed of 130r / min, and put it into a single-screw blow molding machine at a temperature of 180°C. Blow molding at a speed of 1000r / min to obtain SiO 2 Airgel / fiber therm...

Embodiment 3

[0044] Step 1, mix tetraethoxysilane, water, absolute ethanol and 0.08mol / L hydrochloric acid in a molar ratio of 1:7:30:0.05, and then add aluminum silicate fibers with 3% tetraethoxysilane quality, Stir at room temperature and fully hydrolyze to obtain Sol A;

[0045] Step 2, put N-methylpyrrolidone and polyvinyl chloride into the reactor at a molar ratio of 1:5, and mix and stir at 160°C and 350r / min for 40min to prepare slurry B;

[0046] Step 3, mix sol A, slurry B and vanillin according to the mass ratio of 0.7:100:0.7 and place them in a freeze vacuum dryer, freeze at -12°C for 5 hours, and then freeze at -43°C and 20Pa Freeze for 16 hours to obtain a mixed solid, put the mixed solid into a twin-screw extruder, extrude and granulate it into a single-screw blow molding machine at a temperature of 140°C and a speed of 120r / min, and put it into a single-screw blow molding machine at a temperature of 160°C. Blow molding at a speed of 1000r / min to obtain SiO 2 Airgel / fiber...

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Abstract

The invention discloses a SiO2 aerogel / fiber heat-insulation antibacterial composite packaging material and a preparation method thereof, and belongs to the field of packaging materials. The preparation method comprises the following steps: 1, uniformly mixing a silicon source, water, alcohol, an acid solution and fibers to prepare sol; 2, uniformly mixing N-methyl pyrrolidone and polyvinyl chloride to prepare slurry; 3, uniformly mixing the sol, the slurry and an antibacterial component, performing freeze-drying to obtain a mixture, performing granulating, and performing processing to obtain the SiO2 aerogel / fiber heat-insulating antibacterial composite packaging material. The SiO2 aerogel / fiber heat-insulation antibacterial composite packaging material prepared by the invention is a film-shaped material, and the mechanical properties such as tensile strength, breaking strength, low-temperature elongation, right-angle tearing strength and the like of the SiO2 aerogel / fiber heat-insulation antibacterial composite packaging material are equivalent to those of a common plastic film; meanwhile, the heat insulation and bacteriostasis functions are achieved, and wide application prospects are achieved in the fruit, vegetable and food fresh keeping aspect.

Description

technical field [0001] The invention relates to the field of packaging materials, in particular to a SiO 2 Airgel / fiber thermal insulation and antibacterial composite packaging material and preparation method. Background technique [0002] Fruits, vegetables and food are prone to spoilage, so sufficient fresh-keeping measures should be taken during storage, transportation and sale of fruits, vegetables and food. At present, the fresh-keeping measures adopted for fruits, vegetables and food are mostly through cartons, foam boxes or cold storage. The plastic film on the outside of fruits and vegetables and food generally has no fresh-keeping function (although there are currently antibacterial plastic films, they are generally By modifying and grafting plastics to make them have antibacterial function, the process is complicated and expensive, and it is generally used in medical treatment, but not suitable for fruits, vegetables and food). However, the fresh-keeping function...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K7/26C08K7/10C08K5/13C08J5/18
CPCC08J5/18C08J2327/06C08K7/26C08K7/10C08K5/13
Inventor 张帆黄星雨陈亮杨懿汤婧雅
Owner 福州大学至诚学院