Preparation method and application of low formaldehyde-emission soft melamine formaldehyde foam

A melamine formaldehyde, low formaldehyde release technology, applied in mechanical equipment, internal combustion piston engines, combustion engines, etc., can solve the problems of foam mechanical properties, low formaldehyde release, poor mechanical properties and other problems, achieve excellent mechanical properties, reduce free Formaldehyde content, the effect of increasing mechanical properties

Active Publication Date: 2018-01-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Melamine formaldehyde foam also has some shortcomings and deficiencies, such as poor mechanical properties, mainly in terms of compression resilience, tear performance and elongation at break; it also has higher formaldehyde release
However, this small molecule formaldehyde scavenger is easy to be inactivated under high temperature conditions during the foam preparation process. At the same time, a certain amount of addition is necessary to achieve a certain low formaldehyde emission, which also has a great impact on the mechanical properties of the foam.

Method used

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  • Preparation method and application of low formaldehyde-emission soft melamine formaldehyde foam
  • Preparation method and application of low formaldehyde-emission soft melamine formaldehyde foam
  • Preparation method and application of low formaldehyde-emission soft melamine formaldehyde foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add melamine and solid paraformaldehyde into the reaction kettle at a molar ratio of 1:2, raise the temperature to 60°C, add catalyst sodium hydroxide aqueous solution to adjust the pH of the system to 8.5 after the solid paraformaldehyde is dissolved, and then raise the temperature to 85 ℃, add 4 parts of polyethylenimine after reacting for 35min, and discharge after the cloud point occurs in the reaction to obtain the modified melamine formaldehyde resin prepolymerization solution; then the modified resin solution obtained (modified melamine formaldehyde resin prepolymerization solution ) into a water bath at 25°C for cooling.

[0039] Add 6 parts of TW-20, 22 parts of n-pentane, and 8 parts of ammonium chloride to 100 parts of the modified melamine formaldehyde resin prepolymerization solution obtained by the above method, and then emulsify for 2 minutes under a high-speed emulsifier, and then pour the emulsion Put it into a mold, place it in a microwave device to fo...

Embodiment 2

[0042] Add melamine and solid paraformaldehyde into the reaction kettle at a molar ratio of 1:2.5, raise the temperature to 60°C, add catalyst sodium hydroxide aqueous solution to adjust the pH of the system to 8.5 after the solid paraformaldehyde is dissolved, then raise the temperature to 85°C , add 10 parts of polyethylenimine after reacting for 40min, when the cloud point occurs in the reaction, the material is discharged to obtain the modified melamine formaldehyde resin prepolymerization liquid; then the modified resin liquid (modified melamine formaldehyde resin prepolymerization liquid) obtained Cool in a water bath at 25°C.

[0043] Add 6 parts of TW-80, 22 parts of isopentane, and 10 parts of hydrochloric acid to 100 parts of the modified melamine-formaldehyde resin prepolymerization solution obtained by the above method, and then emulsify for 2 minutes under the high-speed emulsifier, and then pour the emulsion into the mold placed in a microwave device for foaming ...

Embodiment 3

[0046] Add melamine and solid paraformaldehyde into the reaction kettle at a molar ratio of 1:3, raise the temperature to 60°C, add catalyst sodium hydroxide aqueous solution to adjust the pH of the system to 8.5 after the solid paraformaldehyde is dissolved, then raise the temperature to 85°C , add 15 parts of polyethylenimine after reacting for 40min, when the cloud point occurs in the reaction, the material is discharged to obtain the modified melamine formaldehyde resin prepolymerization liquid; then the modified resin liquid (modified melamine formaldehyde resin prepolymerization liquid) obtained Cool in a water bath at 25°C.

[0047] Add 8 parts of TW-40, 23 parts of petroleum ether, and 12 parts of sulfuric acid to 100 parts of the modified melamine-formaldehyde resin prepolymerization solution obtained by the above method, and then emulsify for 2 minutes under the high-speed emulsifier, and then pour the emulsion into the mold , placed in a microwave device for foaming...

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Abstract

The invention discloses a preparation method and an application of low formaldehyde-emission soft melamine formaldehyde foam. The preparation method comprises the following steps: adding melamine andformaldehyde into a reaction kettle in a certain molar ratio, and adding a modifying agent to synthesize a modified melamine formaldehyde resin prepolymerized solution; emulsifying the modified melamine formaldehyde resin prepolymerized solution, foaming, curing and quenching the foam to obtain a foam primary product; and washing and drying the foam primary product to obtain low formaldehyde-emission soft melamine formaldehyde foam. The low formaldehyde-emission soft melamine formaldehyde foam can be used as a cushioning material, a filter material, a sound-isolating material, a fireproof material, an insulating material, a vibration-proof material, a decorating material, a packaging material, a filling material and a cleaning material, can overcome the defects of poor mechanical performance, high formaldehyde release amount and the like of existing melamine formaldehyde foam, and provides a macromolecular compound modified melamine formaldehyde resin solution containing amino and imino.

Description

technical field [0001] The invention relates to the field of modification of melamine-formaldehyde resins, in particular to a modified melamine-formaldehyde foam with low formaldehyde release and high flexibility. Specifically, a preparation method and application of low formaldehyde-releasing soft melamine-formaldehyde foam. Background technique [0002] Melamine foam is an intrinsic flame retardant foam material made of melamine formaldehyde resin through a special foaming process. Melamine, also known as melamine, has a nitrogen content of up to 66%. It is an extremely versatile nitrogen-heterocyclic organic chemical intermediate product. The melamine-formaldehyde foam prepared from melamine has excellent flame-retardant properties. When the foam contacts the flame, it will form The dense coke layer will automatically extinguish after the open flame leaves; no toxic and harmful gases and droplets will be produced; it can meet the UL-94-V0 high flame retardant material st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/32C08G12/40C08J9/40
CPCY02T10/12
Inventor 王玉忠汪婷郭德明廖望赵海波徐世美王水秀魏文超
Owner SICHUAN UNIV
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