Nano carbon dioxide-phenolic resin composite foam material and preparation method thereof

A technology of nano-silica and phenolic resin, which is applied in the field of composite foam materials and preparation, can solve the problems of mechanical properties, compressive and bending resistance, unsatisfactory slag drop, high application cost, easy slag drop and damage, etc. Achieve the effects of improving mechanical properties and thermal stability, high mechanical properties and thermal stability, and simple preparation methods

Active Publication Date: 2015-01-28
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although thermoplastic resin foam plastics such as polyethylene, polystyrene, and polyurethane have been very mature and have entered the market commercially, they are still not available due to problems such as flammability, high thermal conductivity, and poor water absorption of these insulating materials. can no longer meet people's needs
[0003] Compared with the above thermoplastic resin foam materials, phenolic resin foam materials have the advantages of good flame retardancy, lower thermal conductivity, and good water absorption. Satisfactorily, the following situations often occ

Method used

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  • Nano carbon dioxide-phenolic resin composite foam material and preparation method thereof
  • Nano carbon dioxide-phenolic resin composite foam material and preparation method thereof
  • Nano carbon dioxide-phenolic resin composite foam material and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0045] Example 1

[0046] The specific steps of preparation are:

[0047] Step 1. First, the SiO with a weight percentage of 20wt% and a particle size of 10nm 2 The sol is ultrasonically dispersed into the formaldehyde solution (or the mixed solution of the formaldehyde solution and the paraformaldehyde) in a weight ratio of 1:3 to obtain a mixed solution. After mixing the mixed solution, phenol, and alkaline solution with a concentration of 15% by weight, they are placed for polymerization reaction at 70°C for 4.5 hours; among them, the formaldehyde solution (or the mixed solution of formaldehyde solution and paraformaldehyde) in the mixed solution, phenol and The weight ratio of the alkaline solution is 1.3:1:0.7, and the alkaline solution is a sodium hydroxide solution to obtain a resol phenolic resin in which silica nanoparticles are uniformly dispersed.

[0048] Step 2. Perform acid neutralization and vacuum distillation treatment on the resole phenolic resin in which silica na...

Example Embodiment

[0050] Example 2

[0051] The specific steps of preparation are:

[0052] Step 1. First, the SiO with a weight percentage of 25wt% and a particle size of 20nm 2 The sol is ultrasonically dispersed into the formaldehyde solution (or the mixed solution of the formaldehyde solution and the paraformaldehyde) in a weight ratio of 1:3.5 to obtain a mixed solution. After mixing the mixed solution, phenol and an alkaline solution with a concentration of 18% by weight, they were placed for polymerization at 75°C for 4.3 hours; among them, the formaldehyde solution (or the mixed solution of formaldehyde solution and paraformaldehyde), phenol and The weight ratio of the alkaline solution is 1.4:1:0.6, and the alkaline solution is a sodium hydroxide solution to obtain a resole phenolic resin in which silica nanoparticles are uniformly dispersed.

[0053] Step 2. Perform acid neutralization and vacuum distillation treatment on the resole phenolic resin in which silica nanoparticles are uniformly...

Example Embodiment

[0055] Example 3

[0056] The specific steps of preparation are:

[0057] Step 1. Firstly, SiO with a weight percentage of 30wt% and a particle size of 30nm 2 The sol is ultrasonically dispersed into a formaldehyde solution (or a mixed solution of formaldehyde solution and paraformaldehyde) in a weight ratio of 1:4 to obtain a mixed solution. Then mix the mixed solution, phenol and alkaline solution with a concentration of 20wt%, and place them at 80°C for 4h polymerization reaction; among them, the formaldehyde solution (or the mixed solution of formaldehyde solution and paraformaldehyde), phenol and alkali in the mixed solution The weight ratio of the aqueous solution is 1.5:1:0.5, and the alkaline solution is a sodium hydroxide solution to obtain a resole phenolic resin in which silica nanoparticles are uniformly dispersed.

[0058] Step 2. Perform acid neutralization and vacuum distillation treatment on the resole phenolic resin in which silica nanoparticles are uniformly disper...

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Abstract

The invention discloses a nano silicon dioxide-phenolic resin composite foam material and a preparation method thereof. The composite foam material is prepared from silicon dioxide nanoparticles, free phenol, free formaldehyde, a surfactant, a curing agent and sodium chloride as well as phenolic resin, wherein the silicon dioxide nanoparticles are bonded with phenolic resin by virtue of Si-O-C chemical bonds. The method comprises the following steps: firstly, ultrasonically dispersing a SiO2 sol in a formaldehyde solution or a mixed liquid of formaldehyde solution and paraformaldehyde to obtain a mixed solution; then, after mixing the mixed solution, phenol and an alkaline solution, and carrying out polymerization reaction to obtain resol in which the silicon dioxide nanoparticles are uniformly dispersed; then, firstly, carrying out acid neutralization and reduced pressure distillation on the resol; then, mixing and stirring the resol with a foaming agent and the surfactant to obtain mixed resin; and finally, adding the curing agent into the mixed resin and putting into a die to cure and foam to prepare a targeted product. The nano silicon dioxide-phenolic resin composite foam material disclosed by the invention can be widely applied to the fields such as building, aviation, refrigeration and the like commercially.

Description

Technical field [0001] The invention relates to a composite foam material and a preparation method, in particular to a nano silicon dioxide-phenolic resin composite foam material and a preparation method thereof. Background technique [0002] With the progress of society, after entering the 21st century, a series of fields such as construction, aviation, refrigeration, etc. have increased the requirements for thermal insulation, and the demand for thermal insulation materials has also been continuously increased. At present, although thermoplastic resin foams such as polyethylene, polystyrene, and polyurethane have been mature and have entered the market commercially, these thermal insulation materials have problems such as flammability, high thermal conductivity, and poor water absorption. It can no longer meet people's needs. [0003] Compared with the above thermoplastic resin foam materials, phenolic resin foam materials have the advantages of good flame retardancy, lower ther...

Claims

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Application Information

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IPC IPC(8): C08G8/10C08K13/02C08K3/36C08K3/16C08K5/42C08J9/14
Inventor 李秋龙陈林郑康张献林永兴刘香兰张金金方飞崔中越田兴友
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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