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Hydrotalcite/polyalcohol composite self-supporting thin film and manufacture method thereof

A technology of self-supporting film and composite film, which is applied in the field of hydrotalcite/polymer composite self-supporting film and its preparation, which can solve the problems of fragility, difficulty in precise control, and unstable existence of the film

Inactive Publication Date: 2008-08-20
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thin film cannot exist stably in aqueous solution, is brittle, and its thickness is above the micron level and it is difficult to precisely control it, which limits its further application.

Method used

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  • Hydrotalcite/polyalcohol composite self-supporting thin film and manufacture method thereof
  • Hydrotalcite/polyalcohol composite self-supporting thin film and manufacture method thereof
  • Hydrotalcite/polyalcohol composite self-supporting thin film and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 15.384g Mg(NO 3 ) 2 ·6H 2 O and 11.253gAl(NO 3 ) 3 9H 2 O dissolved in 50 mL to remove CO 2 In water, prepare a mixed salt solution, take another 6.84g NaOH and dissolve it in 50mL to remove CO 2 In water, quickly pour the alkali solution and the mixed salt solution into a fully back-mixed rotating liquid film reactor to react for 1 minute, and the obtained slurry was hydrothermally crystallized at 120° C. for 8 hours, and the obtained sample was washed to pH=7. The obtained sample was dried at 60 °C for 24 h and ground to obtain magnesium aluminum hydrotalcite (Mg 2 Al-NO 3 LDHs) powder; take 0.1g Mg 2 Al-NO 3 -Add LDHs powder into 100mL formamide solution, stir and react for 1 hour to obtain a clear and transparent sol with a concentration of 1.0g / L. Get 1 drop of sol to drop on the ground glass slide and carry out X-ray diffraction analysis, XRD spectrogram ( figure 1 ) shows that the (003), (006) and other layered structure characteristic diffractio...

Embodiment 2

[0039] Weigh 23.220g Co(NO 3 ) 2 ·6H 2 O and 10.010g Al(NO 3 ) 3 9H 2 O dissolved in 100mL to remove CO 2 In water, prepare a mixed salt solution, take another 8.117g NaOH and dissolve it in 100mL to remove CO 2 In water, quickly pour the alkali solution and the mixed salt solution into a fully back-mixed rotating liquid film reactor for 1 minute reaction, the resulting slurry was hydrothermally crystallized at 140° C. for 10 hours, and the obtained sample was washed to pH=7.5. The obtained sample was dried at 80 °C for 24 h and ground to obtain cobalt aluminum hydrotalcite (Co 3 Al-NO 3 LDHs) powder; take 0.2g Co 3 Al-NO 3 LDHs powder was added into 100mL formamide solution, stirred and reacted for 2 hours to obtain a clear and transparent sol with a concentration of 2.0g / L. Two drops of the sol were put on a ground glass sheet for X-ray diffraction analysis. The XRD spectrum showed that the (003), (006) and other layered structure characteristic diffraction peaks o...

Embodiment 3

[0044] Weigh 34.896g Ni(NO 3 ) 2 ·6H 2 O and 11.253gAl(NO 3 ) 3 9H 2 O dissolved in 50 mL to remove CO 2 In water, prepare a mixed salt solution, take another 11.410g NaOH and dissolve it in 50mL to remove CO 2 In water, the alkali solution and the mixed salt solution were quickly poured into a fully back-mixed rotating liquid film reactor for 1 minute of reaction, and the obtained slurry was hydrothermally crystallized at 160° C. for 16 hours, and the obtained sample was washed to pH=7. The resulting sample was dried at 70 °C for 20 h and ground to obtain nickel aluminum hydrotalcite (Ni 4 Al-NO 3 LDHs) powder; take 0.3g Ni 4 Al-NO 3 LDHs powder was added into 100mL formamide solution, stirred and reacted for 3 hours to obtain a clear and transparent sol with a concentration of 3.0g / L. Take 1 drop of sol and put it on a ground glass sheet for X-ray diffraction analysis. The XRD spectrum shows that the (003), (006) and other layered structure characteristic diffracti...

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Abstract

A free standing hydrotalcite / polymer composite film and a preparation method thereof pertain to the technical field of hydrotalcite film material. The general chemical formula of the film is PEI / (PAA / PEI / PAA / LDHs)n, wherein PEI is polyethyleneimine, PAA is polyacrylic acid, LDHs are hydrotalcite nano particles or hydrotalcite nano sheets. The preparation is that a hydrotalcite precursor is prepared firstly by nucleation and crystallization, then a nano particle sol which is dispreaded evenly is prepared by solvent dispersing method or a hydrotalcite nano sheet sol is prepared by formamide dissection, then the nano particles or nano sheets and polymer are reassembled on the base glass which is surface treated through electrostatic self-assembly technology, so as to obtain the free standing hydrotalcite / polymer composite film after thermal crosslinking treatment. The free standing hydrotalcite / polymer composite film and the preparation method thereof have the advantages that the film has good toughness, thermal stability and photopermeability and has potential application value in the separation, sensor, nano devices and other fields.

Description

technical field [0001] The invention belongs to the technical field of hydrotalcite film materials and preparation thereof, in particular to a hydrotalcite / polymer composite self-supporting film and a preparation method thereof. Background technique [0002] Layered double hydroxyl composite metal oxides, also known as hydrotalcites (layered double hydroxides, abbreviated as LDHs), is an anionic layered material. The chemical composition of the main layer of hydrotalcite, the type and quantity of interlayer anions, etc. are all adjustable, so it has a variety of physical and chemical properties, and has broad application prospects in catalysis, separation, sensing, and optoelectronic functional devices. In addition, hydrotalcite nanosheets can be prepared by exfoliating the hydrotalcite layer, the thickness of which is generally only one nanometer to several nanometers, and the lateral size can reach tens of nanometers to several microns. Charge, so it has the characteristi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08J3/24C08J5/24C08L79/02C08L33/02C08K9/00C08K3/22
Inventor 陈旭雷雨杨文胜
Owner BEIJING UNIV OF CHEM TECH
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