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Preparation method and application of secondary modified layered double hydroxide

A hydroxide and secondary modification technology, which is applied in the treatment of dyed low-molecular organic compounds, fibrous fillers, etc., can solve the problems of difficult delamination, difficult compatibility of polymers, high charge density of sheets, and achieve large layers. Effects of distance, reduced combustion performance, and high thermal stability

Inactive Publication Date: 2014-08-06
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]However, the charge density of the LDH sheet is high, and the -OH group on the sheet makes the surface of the sheet have a strong polarity, resulting in a direct interaction between the LDH layer and the layer Strong effect, hard to delaminate
Moreover, the interlayer gap of the usual inorganic LDH is very small, which is much smaller than the radius of gyration of the polymer chain, which seriously hinders the intercalation reaction of the polymer chain.
In addition, the strong polar LDH sheet also leads to the strong hydrophilicity of LDH, which is difficult to be compatible with lipophilic polymers

Method used

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  • Preparation method and application of secondary modified layered double hydroxide
  • Preparation method and application of secondary modified layered double hydroxide
  • Preparation method and application of secondary modified layered double hydroxide

Examples

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Embodiment 1

[0040] In this example, cobalt chloride and aluminum chloride were used as reactants, and sodium laurate was used as modifier to prepare a primary modified cobalt-aluminum layered double hydroxide by co-precipitation method. The specific modification process is as follows:

[0041] Prepare an aqueous solution in which 4.44g of sodium laurate is dissolved in advance, and 4.76g of CoCl 2 ·6H 2 O and 2.415g AlCl 3 ·9H 2 O metal salt mixed solution in N 2 It was added dropwise into the vigorously stirred sodium laurate aqueous solution under the atmosphere, during which the co-precipitation reaction temperature of the system was kept at 40°C, and the NaOH solution was continuously added to maintain the pH between 9.0-10.0. The resulting suspension was then placed in N 2 Under the protection of 70 ℃ crystallization 24h. The resulting solid product was washed with boiled deionized water and filtered until the pH of the filtrate was neutral, and the fi...

Embodiment 2

[0043] The primary modified cobalt-aluminum layered double hydroxide obtained in Example 1 is subjected to secondary modification, and dodecyltrimethylammonium bromide is selected as the secondary modifier. The specific modification process is as follows:

[0044] (1) Mix 50ml of ethanol with 50ml of water to prepare ethanol aqueous solution;

[0045] (2) Add 1.5 g of the primary modified cobalt-aluminum layered double hydroxide prepared in Example 1 to the above-mentioned aqueous ethanol solution, and then add 1.82 g of the secondary modifier dodecyltrimethylammonium bromide , stirred to form a mixed solution;

[0046] (3) Heat up the mixed solution obtained in step (2) to 70°C, stir, and react for 24 hours;

[0047] (4) Reflux, crystallize, and filter the reaction solution obtained after the reaction in step (3), and then wash and dry the obtained solid product to obtain red secondary modified cobalt-aluminum layered double hydroxide.

[0048] As can be seen fr...

Embodiment 3

[0051] In the reaction kettle equipped with a stirring and reflux device, add 50ml of deionized water and 50ml of ethanol, after stirring evenly, add 5g of the primary modified CoAl-LDH prepared in Example 1 and 7g of the secondary modifier Tetradecyl Trimethylammonium bromide, heated to 60°C with stirring, reflux crystallization reaction for 12 hours, then lowered the reaction kettle to room temperature, filtered, washed, and dried the filter cake at 60°C to obtain the red powder product secondary Modified CoAl-LDH.

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Abstract

The invention relates to a preparation method and application of secondary modified layered double hydroxide. The preparation method comprises the following steps: performing primary modification on layered double hydroxide by using lauric acid anions, and performing secondary modification on the layered double hydroxide subjected to the primary modification by using aliphatic cationic compounds such as cetyl trimethylammonium bromide and the like. Compared with the layered double hydroxide usually subjected to only one modification process in the prior art, the secondary modified double hydroxide subjected to two modification processes has larger interlayer spacing and higher heat stability, and can be used as reinforcer in a biological polyester poly(3-hydroxybutyrate-co-4-hydroxybutyrate) material.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic compounds, and in particular relates to a preparation method of a twice-modified layered double hydroxide, and the twice-modified layered double hydroxide is used as an enhancer in biological Applications in polyester poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3,4)HB] matrix. Background technique [0002] Layered double hydroxide (LDH) as an additive to polymer-based materials has the following advantages: (1) Environmentally friendly, it does not produce any toxic or corrosive gases during combustion, and does not produce harmful residues; (2) Natural products are easy to obtain and synthesize, with controllable purity and composition, and low cost; (3) the types and quantities of metal cations and interlayer anions are easy to adjust, and can adapt to various requirements; (4) There may be a synergistic effect between them, and each synergistic component has a uniform dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/40C09C3/08C08K9/04C08K7/00C08K3/22C08K3/28C08K3/30C08L67/04
Inventor 张蕤朱清王坚剑
Owner NANJING FORESTRY UNIV
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