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Preparation of attapulgite modified by silane coupling agent

A silane coupling agent, soil silane coupling agent technology, applied in the field of high value-added attapulgite development and utilization, to achieve the effect of expanding the scope of use, expanding the use value and utilization rate, and simple process

Inactive Publication Date: 2009-12-30
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Utilizing the rich hydroxyl structure of attapulgite, using anhydrous system to disperse attapulgite and then modifying it with a silane coupling agent has not been reported.

Method used

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  • Preparation of attapulgite modified by silane coupling agent
  • Preparation of attapulgite modified by silane coupling agent
  • Preparation of attapulgite modified by silane coupling agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The attapulgite used is the attapulgite raw ore collected from Xuyi, Jiangsu.

[0023] Acid treatment of attapulgite: Add 200mL of 2mol / L hydrochloric acid solution to 20g of attapulgite, shake in 60°C water at 120r / min for 120min, filter with suction, wash with deionized water until no chloride ion is detected with 0.1mol / L silver nitrate Afterwards, dry and crush through a 200-mesh sieve.

[0024] KH550 modified attapulgite: Weigh 10g of the above acid-treated attapulgite, add 500mL of dry toluene, stir to disperse the attapulgite evenly, then add 0.35g of coupling agent KH550, fill with nitrogen, heat and reflux for 10h, filter, and fully wash , remove the residual solvent, and pass through a 200-mesh sieve after drying to obtain the KH550 modified attapulgite product. attached by figure 2 It can be seen that the appearance of N element binding energy spectrum indicates that KH550 has condensed with attapulgite.

Embodiment 2

[0026] The attapulgite clay raw material used and the acid treatment of attapulgite are the same as in Example 1.

[0027] KH550 modified attapulgite: Weigh 0.2g coupling agent KH550, add 500mL dry dichloromethane, stir to disperse the attapulgite evenly, then add 10g of the above acid-treated attapulgite, heat and reflux for 30h, filter, wash, vacuum Remove the residual solvent, pass through a 200-mesh sieve after drying, and obtain the KH550 modified attapulgite product. The content changes of some elements in the product are shown in Table 1.

[0028] Table 1 XPS relative content changes of some elements before and after KH550 modification

[0029]

[0030] From the XPS relative content of some elements before and after modification in Table 1, it can be seen that the relative content of C and N elements increased to 29.14% and 3.83% respectively after modification.

Embodiment 3

[0032] The attapulgite clay raw material used and the acid treatment of attapulgite are the same as in Example 1.

[0033] KH550 modified attapulgite: Weigh 10g of acid-treated attapulgite, add 500mL of dry n-hexane, stir to disperse the attapulgite evenly, then add 0.6g of coupling agent KH550, fill with nitrogen, heat and reflux for 24h, filter, wash, Vacuum remove the residual solvent, pass through a 200-mesh sieve after fully drying, and obtain the KH550 modified attapulgite product. CHN elemental analysis was carried out on the product: the N content was 1.912%, and the C content was 6.005%.

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Abstract

The invention discloses a method for preparing attapulgite modified by silane coupling agent, belonging to the technical field of development and utilization of the attapulgite. The method comprises the following steps: properly activating raw ores of the attapulgite with acid; refluxing the mixture of the acid activation attapulgite, the silane coupling agent and an organic solvent for 2-36 hours at the temperature of 50-120 DEG C; and then filtering and washing to obtain the attapulgite modified by silane coupling agent by filtering and washing the mixture. The invention adopts the silane coupling agent for treatment, enhances the interaction force between the attapulgite and organics and has good dispersity among organics. The invention lays the foundation for enlarging the application range of the attapulgite and increasing the added value of the attapulgite.

Description

technical field [0001] A method for preparing attapulgite organically modified by a silane coupling agent belongs to the technical field of development and utilization of attapulgite with high added value. Background technique [0002] Attapulgite is a natural nano-layer chain structure of hydrous magnesium-aluminosilicate clay minerals, which are rich in resources in my country, mainly distributed in Jiangsu, Anhui and other places. Attapulgite clay mineral is a natural nanostructure mineral material with nanochannel structure, and is an ideal reinforcing material for polymer materials. The surface and interior of attapulgite crystals contain a large amount of hydroxyl structures such as silicon hydroxyl, magnesium hydroxyl, and aluminum hydroxyl, and three types of water such as zeolite water, structural water, and crystal water, which make the surface of attapulgite hydrophilic. It is difficult to disperse in organic systems such as chemical fiber and chemical fiber, and...

Claims

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Application Information

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IPC IPC(8): C01B33/40
Inventor 金青哲张丽霞黄健花单良刘元法王兴国
Owner JIANGNAN UNIV
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