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 and fibrous fillers, can solve the problems of nano-particle agglomeration and inability to disperse, and achieve good compatibility, high thermal decomposition temperature, Effect of improving mechanical properties and thermal stability

Active Publication Date: 2013-07-10
徐州光头强木业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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
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Effect test

example 1

[0019] Example 1: Weigh 4.0 g of montmorillonite, swell it with distilled water, and disperse it by ultrasonic to form a uniform suspension. Weigh 2.0 g of tetraethyl orthosilicate (TEOS), add absolute ethanol and stir for 30 minutes to prepare an alcohol solution of tetraethyl orthosilicate. Slowly add the prepared solution dropwise into the montmorillonite suspension, stir vigorously until the solution is uniform, and use ultrasonic dispersion 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 hydrolysis of ethyl orthosilicate, dry the obtained reaction solution in an oven at 60°C, and grind the obtained powder into powder, namely The montmorillonite particles modified by nano-silica are obtained. The obtained product was fully dispersed in a mixed solution of 100mL ethanol / distilled water (volume ratio 9:1), and 0.8g γ-aminopropyltriethoxysilane (KH550) was slowly added dropwise, stirr...

example 2

[0020] Example 2: Weigh 4.0 g of montmorillonite, swell it with distilled water, and then disperse it with ultrasound to form a uniform suspension. Weigh 4.0 g of tetraethyl orthosilicate (TEOS), add absolute ethanol and stir for 30 minutes to prepare an alcohol solution of tetraethyl orthosilicate. Slowly add the prepared solution dropwise into the montmorillonite suspension, stir vigorously until the solution is uniform, and use ultrasonic dispersion 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 hydrolysis of ethyl orthosilicate, dry the obtained reaction solution in an oven at 60°C, and grind the obtained powder into powder, namely The montmorillonite particles modified by nano-silica are obtained. Fully disperse the obtained product in a mixed solution of 100mL ethanol / distilled water (volume ratio 9:1), slowly add 1.2g of γ-aminopropyltrimethoxysilane dropwise, stir at room tempe...

example 3

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

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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, and relates to the preparation of nano-silica modified montmorillonite particles and the method for applying in-situ method to generate modified water-based 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 introduced into the polyurethane polymer chain through an emulsifier or a hydrophilic group, and the resulting polymer main chain contains multiple structural units of urethane bonds. Water-based polyurethane not only has the advantages of good wear resistance, corrosion resistance, chemical resistance, high elasticity, and flexible component adjustment of solvent-based polyurethane, but also has the advantages of non-combustibility and pollution-free. Widely used in textile, printing and dyeing, leather processi...

Claims

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Application Information

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Patent Type & Authority Patents(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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