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Nano-grade silica modified montmorillonite particle preparation method, and method for applying nano-grade silica modified montmorillonite particles in producing modified aqueous polyurethane resin with in-situ method

A technology of nano-silica and nano-montmorillonite, which is applied in the treatment of dyed organosilicon compounds, fibrous fillers, etc., can solve the problems of nano-particle agglomeration and inability to disperse, and achieve good compatibility, high thermal decomposition temperature, Effect of Tensile Strength Improvement

Active Publication Date: 2012-02-08
徐州光头强木业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is easy to agglomerate a large number of nanoparticles and cannot be well dispersed.

Method used

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  • Nano-grade silica modified montmorillonite particle preparation method, and method for applying nano-grade silica modified montmorillonite particles in producing modified aqueous polyurethane resin with in-situ method
  • Nano-grade silica modified montmorillonite particle preparation method, and method for applying nano-grade silica modified montmorillonite particles in producing modified aqueous polyurethane resin with in-situ method
  • Nano-grade silica modified montmorillonite particle preparation method, and method for applying nano-grade silica modified montmorillonite particles in producing modified aqueous polyurethane resin with in-situ method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Example 1: Weigh 4.0 g of montmorillonite, swell it with distilled water and then disperse it with ultrasound until a uniform suspension is formed. Weigh 2.0 g of ethyl orthosilicate (TEOS), add absolute ethanol and stir for 30 minutes to prepare an alcohol solution of ethyl orthosilicate. The prepared solution is slowly added dropwise to the montmorillonite suspension, stirred vigorously until the solution is uniform, and dispersed by ultrasonic for about 1 hour. Add ammonia water dropwise to the suspension to control the pH value at 9.5, stir at room temperature for 24 hours, after the ethyl orthosilicate is hydrolyzed, the resulting reaction solution is dried in an oven at 60°C, and the resulting powder is ground into a powder, namely The nano-silica modified montmorillonite particles are obtained. Disperse the obtained product in 100mL ethanol / distilled water mixed solution (volume ratio 9:1), slowly add 0.8g γ-aminopropyltriethoxysilane (KH550) dropwise, stir at ro...

example 2

[0020] Example 2: Weigh 4.0 g of montmorillonite, swell it with distilled water and then disperse it with ultrasound until a uniform suspension is formed. Weigh 4.0 g of ethyl orthosilicate (TEOS), add absolute ethanol and stir for 30 min to prepare an alcohol solution of ethyl orthosilicate. The prepared solution is slowly added dropwise to the montmorillonite suspension, stirred vigorously until the solution is uniform, and dispersed by ultrasonic for about 1 hour. Add ammonia water dropwise to the suspension to control the pH value at 10, stir at room temperature for 24 hours, after the ethyl orthosilicate is hydrolyzed, the resulting reaction solution is dried in an oven at 60°C, and the resulting powder is ground into powder, namely The nano-silica modified montmorillonite particles are obtained. The obtained product was fully dispersed in a mixed solution of 100 mL ethanol / distilled water (volume ratio 9:1), 1.2 g of γ-aminopropyltrimethoxysilane was slowly added dropwis...

example 3

[0021] Example 3: Weigh 4.0 g of montmorillonite, swell it with distilled water and then disperse it with ultrasound until a uniform suspension is formed. Weigh 8.0 g of ethyl orthosilicate (TEOS), add absolute ethanol and stir for 30 minutes to prepare an alcohol solution of ethyl orthosilicate. The prepared solution is slowly added dropwise to the montmorillonite suspension, stirred vigorously until the solution is uniform, and dispersed by ultrasonic for about 1 hour. Add ammonia water dropwise to the suspension to control the pH at 10.5, stir at room temperature for 24 hours, after the ethyl orthosilicate is hydrolyzed, the resulting reaction solution is dried in an oven at 60°C, and the resulting powder is ground into powder, namely The nano-silica modified montmorillonite particles are obtained. Fully disperse the obtained product in a mixed solution of 100 mL ethanol / distilled water (volume ratio 9:1), and slowly add 1.6 g N-β (aminoethyl)-γ-aminopropylmethyldimethoxysi...

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Abstract

The invention relates to a nano-grade silica modified montmorillonite particle preparation method, and a method for applying the nano-grade silica modified montmorillonite particles in producing modified aqueous polyurethane resin with an in-situ method. According to the invention, tetraethoxysilane, a silicane coupling agent and montmorillonite are subject to a modification reaction, such that anano-grade silica layer is modified on the surface of montmorillonite, and active amino-groups are modified. Therefore, the compatibility of montmorillonite in aqueous polyurethane resin is better, such that the emulsion can be more stable. According to the invention, silica modified montmorillonite is prepared through an in-situ method, a silica layer comprising a large amount of silanol is modified on the surface of montmorillonite, and lamella parts of montmorillonite are peeled. When the modified particles are positioned in an aqueous polyurethane system, high molecular chains of polyurethane are subject to an intercalation reaction with montmorillonite, such that free movements of polyurethane molecular chains are restricted, and mechanical properties and thermal stability of the material are improved. Compared to simple polyurethane, tensile strength of the material is improved by 1-2 times, and thermal decomposition temperature of the material is improved by 30 to 50 DEG C.

Description

Technical field [0001] The invention belongs to the field of new polymer composite materials; it relates to a method for preparing nano-silica modified montmorillonite particles and applying it to in-situ method to generate modified waterborne polyurethane resin. Background technique [0002] Waterborne polyurethane resin refers to a binary colloidal system formed by dissolving or dispersing polyurethane resin in water. The water-based polyurethane is mainly through the introduction of an emulsifier or the introduction of hydrophilic groups into the polyurethane polymer chain, and the resulting polymer main chain contains multiple structural units with urethane bonds. Waterborne polyurethane not only has the advantages of solvent-based polyurethane such as good wear resistance, corrosion resistance, chemical resistance, high elasticity, and flexible component adjustment, but also has the advantages of non-combustibility and pollution-free. It is widely used in textile, printing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/42C09C3/12C08G18/75C08G18/66C08G18/48C08G18/10
Inventor 许鑫华范海南郭美卿杨治强刘峰
Owner 徐州光头强木业有限公司
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