In-situ co-precipitation synthesis method for organic silane grafted hydrotalcite with controllable interlayer spacing

A technology of in-situ co-precipitation and synthesis method is applied in the field of preparation of interlayer controllable organosilane-grafted hydrotalcite, which can solve the problems of poor stability, poor stability and secondary pollution of composite materials, and achieves improved dispersibility and improved Dispersibility and homogeneity, the effect of improving affinity

Inactive Publication Date: 2012-08-01
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the surfactant is combined with the mineral surface by electrostatic force, the stability is poor, and it is easy to fall off due to excessive use

Method used

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  • In-situ co-precipitation synthesis method for organic silane grafted hydrotalcite with controllable interlayer spacing
  • In-situ co-precipitation synthesis method for organic silane grafted hydrotalcite with controllable interlayer spacing
  • In-situ co-precipitation synthesis method for organic silane grafted hydrotalcite with controllable interlayer spacing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mg 2+ 、Al 3+ The hydrotalcite is the metal skeleton ion, the lauryl sodium sulfate is the interlayer spacing control agent, and the gamma-aminopropyl triethoxysilane is the organosilane grafted hydrotalcite as the graft modifier.

[0034] Weigh 19.2 g Mg(NO 3 ) 2 ·6H 2 O and 9.4 g Al(NO 3 ) 3 ?9H 2 O co-dissolves in 90 cm 3 deionized water (solution A). 8 g NaOH and 1.4 g sodium lauryl sulfate were dissolved in 50 cm 3 deionized water (solution B). 7.0cm 3 γ-Aminopropyltriethoxysilane dissolved in 50 cm 3 in ethanol (solution C). Add solutions A and B dropwise to 100 cm 3 In deionized water, when precipitation occurs, immediately add solution C dropwise. During the dropwise addition, the mixed solution was stirred rapidly, and the pH value of the mixed solution was controlled to be stable at about 10. After the dropwise addition was completed, stirring was continued for 6h. Wash with deionized water and ethanol three times each. The obtained precipitat...

Embodiment 2

[0037] Mg2+ 、Al 3+ The hydrotalcite is the metal skeleton ion, the lauryl sodium sulfate is the interlayer spacing control agent, and the gamma-aminopropyl triethoxysilane is the organosilane grafted hydrotalcite as the graft modifier.

[0038] Weigh 19.2 g Mg(NO 3 ) 2 ·6H 2 O and 9.4 g Al(NO 3 ) 3 ?9H 2 O co-dissolves in 90 cm 3 deionized water (solution A). 8 g NaOH and 2.2 g sodium lauryl sulfate were dissolved in 50 cm 3 deionized water (solution B). 5.0cm 3 γ-Aminopropyltriethoxysilane dissolved in 50 cm 3 in propanol (Solution C). Add solutions A and B dropwise to 100 cm 3 deionized water. When precipitation occurs, immediately add solution C dropwise. During the dropwise addition, the mixed solution was stirred rapidly, and the pH value of the mixed solution was controlled to be stable at about 10. After the dropwise addition was completed, stirring was continued for 6h. Wash with deionized water and propanol three times each. The obtained precipitate ...

Embodiment 3

[0040] Zn prepared by in situ co-precipitation 2+ 、Al 3+ The hydrotalcite is the metal skeleton ion, the lauryl sodium sulfate is the laminate spacing control agent, and the gamma-aminopropyl trimethoxysilane is the organosilane grafted hydrotalcite as the graft modifier.

[0041] Weigh 22.3 g Zn(NO 3 ) 2 ·6H 2 O and 9.4 g Al(NO 3 ) 3 ?9H 2 O co-dissolves in 90 cm 3 deionized water (solution A). 8 g NaOH and 4.3 g sodium lauryl sulfate were dissolved in 50 cm 3 deionized water (solution B). 5.0cm 3 γ-Aminopropyltrimethoxysilane dissolved in 50 cm 3 in isopropanol (Solution C). Add solutions A and B dropwise to 100 cm 3 deionized water. When precipitation occurs, immediately add solution C dropwise. During the dropwise addition, the mixed solution was stirred rapidly, and the pH value of the mixed solution was controlled to be stable at about 10. After the dropwise addition was completed, stirring was continued for 6h. Wash three times each with deionized wate...

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Abstract

The invention discloses an in-situ co-precipitation synthesis method for organic silane grafted hydrotalcite with a controllable interlayer spacing. Compared with a traditional co-precipitation hydrotalcite synthesis method, the in-situ co-precipitation synthesis method is characterized in that the height of an interlayer space of hydrotalcite is regulated and controlled by the aid of an intercalation effect of surfactant; and the affinity of the surface of minerals is effectively improved by the aid of in-situ condensation of Si-OH generated by hydrolysis of organic silane and hydroxyl on the surface of the clay mineral while hydrotalcite crystal is formed, accordingly, usage of the surfactant is controlled, potential environmental threads including desorption of the surfactant and the like are reduced, reduction of stability and homogeneity of a composite material is also decreased, and the like. Raw materials required by the synthesis method are easily accessible, operation is simple and feasible, and the obtained organic silane grafted hydrotalcite has an important application value in fields such as clay-based nano-composite materials, repair of organic anion environmental pollutant, halogen-free flame retardant and the like.

Description

technical field [0001] The invention belongs to the field of surface reaction properties of inorganic layered materials and clay minerals, and in particular relates to a preparation method of organosilane-grafted hydrotalcite with controllable interlayer spacing. Background technique [0002] Hydrotalcite-like layered compounds, also known as layered doubled hydroxides (LDHs), are the only minerals that exist in nature with anions between layers. Part of the Mg in its brucite-like octahedral laminate 2+ By Al 3+ After the isomorphic replacement of high-valent metals, the excess positive charge is released from the interlayer CO 3 2– Equilibrated by intercalating anions. The typical representative structural formula of hydrotalcite minerals can be expressed as: Mg 6 al 2 (OH) 16 (CO 3 ) xH 2 O. Due to its unique positively charged laminate structure and excellent interlayer anion exchange performance, this type of material is widely used in many fields such as adsor...

Claims

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Application Information

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IPC IPC(8): C01B13/36
Inventor 陶奇何宏平朱建喜袁鹏
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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