Preparation method and application of modified nano-silicon dioxide toughened epoxy resin

A technology of nano-silica and tough epoxy resin, which is applied in epoxy resin coatings, coatings, anti-corrosion coatings, etc., can solve the problems of toughness enhancement and excellent performance reduction of epoxy resin, and achieve stable resin performance and coating performance. Improved effect

Inactive Publication Date: 2013-05-22
佛山科富科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thereby overcoming the technical problem that the toughness of the epoxy resin itself is enhanced while the exce

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Preparation of modified nano-silica

[0017] First, take 1g of KH-550 and add it to 48g of absolute ethanol, add glacial acetic acid to adjust the pH value to 3.5, and ultrasonically oscillate for 10 minutes to completely dissolve it in absolute ethanol.

[0018] Weigh 5g nano-SiO 2 , put it into a three-necked flask, pour 20g of dispersed KH-550 absolute ethanol solution, ultrasonically disperse for 30min, then put it into a constant temperature water bath, stir at a constant temperature of 75°C for 3.5 hours at a stirring speed of 450r / min. Then cool, centrifuge, and dry at 140° C. for 24 hours to obtain a modified nano-silica powder.

[0019] (2) Preparation of modified nano-silica toughened epoxy resin

[0020] Add 100g of liquid epoxy resin into the reaction vessel, install an electric high-speed mixer, heat to 60°C, add 0.1g of modified nano-silica under stirring, add slowly, and stir evenly after the addition is complete , under the condition of high-s...

Embodiment 2

[0028] (1) Preparation of modified nano-silica

[0029] First, take 1.5g KH-550 and add it to 49g absolute ethanol, then add glacial acetic acid to adjust the pH value to 4, and ultrasonically oscillate for 15 minutes to completely dissolve it in absolute ethanol.

[0030] Weigh 5.5g nano-SiO 2 , put it into a three-necked flask, pour 25g of dispersed KH-550 absolute ethanol solution, ultrasonically disperse for 30min, then put it into a constant temperature water bath, stir at a constant temperature of 75°C for 4 hours at a stirring speed of 450r / min. Then cool, centrifuge, and dry at 140° C. for 24 hours to obtain a modified nano-silica powder.

[0031] (2) Preparation of modified nano-silica toughened epoxy resin

[0032] Add 100g of liquid epoxy resin into the reaction vessel, install an electric high-speed mixer, heat to 60°C, add 0.5g (according to the amount of epoxy resin) of modified nano-silica under stirring, and slowly Add, after the addition is complete, st...

Embodiment 3

[0040] (1) Preparation of modified nano-silica

[0041] First, take 2g of KH-550 and add it to 50g of absolute ethanol, add glacial acetic acid to adjust the pH value to 3.6, and ultrasonically oscillate for 20 minutes to completely dissolve it in absolute ethanol.

[0042] Weigh 6g nano-SiO 2 , put it into a three-necked flask, pour 30g of dispersed KH-550 absolute ethanol solution, ultrasonically disperse for 30min, then put it into a constant temperature water bath, stir at a constant temperature of 75°C for 4.5 hours at a stirring speed of 450r / min. Then cool, centrifuge, and dry at 140° C. for 24 hours to obtain a modified nano-silica powder.

[0043] (2) Preparation of modified nano-silica toughened epoxy resin

[0044]Add 100g of liquid epoxy resin into the reaction vessel, install an electric high-speed mixer, heat to 60°C, add 1g (according to the amount of epoxy resin) of modified nano-silica under stirring, and add it slowly , after the addition is complete, ...

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Abstract

The invention relates to a preparation method of modified nano-silicon dioxide toughened epoxy resin; the preparation method comprises the following steps of: (1), adding 1-2g of amino silane coupling agent into 48-50g of absolute ethyl alcohol firstly, adding glacial acetic acid to adjust the pH (potential of hydrogen) value to be 3-4, shaking by ultrasonic wave in order to fully dissolve the amino silane coupling agent into the absolute ethyl alcohol; (2), putting 5-6g of nano-SiO2 into a flask, pouring 20-30g of the solution obtained in step (1), dispersing by ultrasonic wave for 30min, stirring for 3-5 hours at the constant temperature of 75 DEG C at the stirring speed of 450rpm, cooling, centrifugally separating, and drying for 24 hours at 140 DEG C, so as to obtain modified nano-silicon dioxide; and (3), adding 50-150g of liquid epoxy resin into a reaction container, heating to 60 DEG C, slowly adding 0.1-1% by weight of liquid epoxy resin of modified nano-silicon dioxide prepared by step (2) while stirring, after adding, stirring uniformly, dispersing by high-speed shearing, heating to 90 DEG C within 1 hour, and then reacting for 3-5 hours at a constant temperature, cooling, finally the product is obtained. The resin prepared by the preparation method is stable in property, and the property of the prepared coating is greatly improved.

Description

technical field [0001] The present invention relates to a preparation method of epoxy resin, in particular to a preparation method of modified nano silicon dioxide chemically toughened epoxy resin and environment-friendly protective coating. The environment-friendly coating produced by this method can be widely used Anti-corrosion coating for steel structures. Background technique [0002] Epoxy resin has excellent properties, such as strong adhesion, good processability and low shrinkage, and is currently one of the most widely used thermosetting resins. However, epoxy resins, especially low-molecular-weight epoxy resins with low viscosity, have a large number of epoxy groups in the molecule. When curing, the cross-linking density is very large, the property is very brittle, the fatigue strength and impact toughness are worse, and the heat resistance is poor. , The peel strength is particularly poor, which affects the adhesion and anti-corrosion performance of the epoxy co...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K9/06C08K3/36C09D163/00C09D7/12C09D5/08
Inventor 钟萍渠美丽袁兴
Owner 佛山科富科技有限公司
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