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Low-water-absorption heat-preservation hard melamine foam and preparation method thereof

A technology with low water absorption rate and water absorption rate, applied in the field of polymer materials, can solve the problems of increased thermal conductivity, low closed cell rate of melamine foam, and inability to effectively prevent water penetration.

Active Publication Date: 2021-09-10
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the closed cell rate of melamine foam is low, and the open cell foam structure cannot effectively prevent water from penetrating into the cells.
If the insulation material is permeated by water for a long time, its thermal conductivity will increase, the mechanical properties of the foam will deteriorate and the service life will be shortened

Method used

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  • Low-water-absorption heat-preservation hard melamine foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation operation steps of a kind of low water absorption thermal insulation rigid melamine foam are as follows:

[0023] (1) Add 176.7g of distilled water, 112.7g of paraformaldehyde, and 150g of melamine to a three-necked flask in sequence, and mix and stir for 10 minutes at 85°C to obtain a clear solution;

[0024] (2) Add 18g of n-butanol and 1.2g of hexamethylenetetramine to the clear solution, and continue the reaction for 2.40h. After the reaction is completed, use a cold water bath to quickly cool to 30°C to obtain the modified melamine resin prepolymer solution;

[0025] (3) When the viscosity of the modified melamine resin prepolymerization liquid reaches 30Pa s, add 2g of nano-silica (100nm), 4g of dimethyl silicone oil, and 10g of n-pentyl to 200g of the modified melamine resin prepolymerization liquid Alkanes and 1.5g of dodecylbenzenesulfonic acid, stirred at 1300r / min for 2min at high speed, then added 1.4g of hydrochloric acid and stirred for 30s...

Embodiment 2

[0028] The preparation operation steps of a kind of low water absorption thermal insulation rigid melamine foam are as follows:

[0029] (1) Add 176.7g of distilled water, 112.7g of paraformaldehyde, and 150g of melamine to a three-necked flask in sequence, and mix and stir for 10 minutes at 85°C to obtain a clear solution;

[0030] (2) Add 9g of n-butanol and 1.1g of hexamethylenetetramine to the clear solution, and continue the reaction for 2.30h. After the reaction is completed, use a cold water bath to quickly cool to 30°C to obtain the modified melamine resin prepolymer solution;

[0031] (3) When the viscosity of the modified melamine resin prepolymerization liquid reaches 40Pa s, add 4g nanometer white carbon black (100nm), 4.2g dimethyl silicone oil, 11g positive Pentane and 1g of dodecylbenzenesulfonic acid, stirred at 1300r / min for 2.5min at high speed, then added 1.3g of hydrochloric acid and stirred at high speed for 35s; foamed in an oven at 80°C for 35min, mature...

Embodiment 3

[0034] The preparation operation steps of a kind of low water absorption thermal insulation rigid melamine foam are as follows;

[0035] (1) Add 176.7g of distilled water, 112.7g of paraformaldehyde, and 150g of melamine to a three-necked flask in sequence, and mix and stir for 10 minutes at 80°C to obtain a clear solution;

[0036] (2) Add 18g of n-butanol and 1.3g of hexamethylenetetramine to the clear solution, and continue the reaction for 2.50h. After the reaction, use a cold water bath to quickly cool to 25°C to obtain the modified melamine resin prepolymer solution ;

[0037] (3) When the viscosity of the modified melamine resin prepolymerization liquid reaches 35Pa·s, add 2g of micron silica (5um), 4g of dimethyl silicone oil, 10g of n-pentane and 1.4g of ten Dialkylbenzenesulfonic acid, stirred at high speed of 1300r / min for 2min, then added 1.4g of oxalic acid and stirred at high speed for 25s; foamed in an oven at a temperature of 80°C for 40min, and matured to obt...

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Abstract

The invention relates to low-water-absorption heat-preservation hard melamine foam and a preparation method thereof, and belongs to the technical field of high polymer materials. According to the low-water-absorption heat-preservation hard melamine foam, the density is smaller than 53 kg / m<3>, the water absorption is as low as 6.7%, the heat conductivity coefficient is as low as 0.034 W / m.K, the percentage of closed area reaches 80%, the compression strength reaches 300 kPa, and the limit oxygen index reaches up to 35%. In the preparation process, short-chain hydrophobic alcohol micromolecules and solid filler are added; a 'suspended' short-chain hydrophobic alkyl group is introduced into a side group of a molecular chain of a melamine resin prepolymer modified by short-chain hydrophobic alcohol micromolecules, so that the hydrophobicity of the resin is effectively improved, and meanwhile, the content of the 'suspended' short chain with relatively good flexibility is increased, so that the toughness of the resin can be improved, and the foam pulverization rate is reduced. In the preparation stage of the modified hydrophobic melamine prepolymer foaming liquid, a solid filler is added as a nucleating agent to adjust a foam structure, and free energy barriers for growth of bubble nuclei can be effectively reduced to promote heterogeneous nucleation, so that the low-water-absorption heat-preservation hard melamine foam which is small in foam size and uniform in distribution is prepared.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a preparation method of a low water absorption thermal insulation rigid melamine foam. Background technique [0002] Rigid melamine foam, also known as rigid melamine formaldehyde foam, is a foam material prepared from melamine resin through a certain foaming process. Due to its special triazine ring structure, a dense carbon layer can be quickly formed on the surface of the foam during combustion to isolate oxygen and generate a large amount of N 2 , so that the foam has intrinsic flame retardancy and is widely used in building fireproof materials. Since there are still unreacted hydrophilic groups (-NH-, -OH) in the melamine foam matrix, they are easy to form hydrogen bonds with water molecules in the air, increasing the hydrophilicity of the foam matrix. Moreover, the closed cell rate of melamine foam is low, and the open cell foam structure cannot effectively preven...

Claims

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Application Information

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IPC IPC(8): C08L61/32C08K7/26C08K9/06C08J9/14C08G12/42
CPCC08J9/141C08J9/0071C08J9/009C08G12/427C08J2361/32C08K2201/011C08K7/26C08K9/06C08J2203/14
Inventor 马海红杨心愿李春晖任凤梅周正发徐卫兵
Owner HEFEI UNIV OF TECH
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