Special resin liquid for hydrophobic melamine foams, and preparation method thereof, and foaming liquid prepared from special resin liquid

Abstract

The invention discloses a special resin liquid for hydrophobic melamine foams, and a preparation method thereof, and a foaming liquid prepared from the special resin liquid, wherein the special resinliquid is prepared by polymerizing the following raw materials by weight: 100 parts of melamine, 40-100 parts of formaldehyde, more than 0-10 parts of a modified monomer and / or a functional compound,1-3 parts of a catalyst, and 50-80 parts of water. According to the present invention, with the special resin liquid, the soft, semi-rigid and rigid hydrophobic melamine foams with the controlled andregulated density of 6-100 kg / m<3> can be prepared, wherein the soft melamine foam with the density of less than 20 kg / m<3> has the water absorption rate of less than 10% and the contact angle of morethan 120 DEG, and the semi-rigid and rigid melamine foams with the density of more than 25 kg / m<3> has the water absorption rate of less than 5%, the contact angle of more than 130 DEG, and the tensile strength of more than 120 kPa.

Description

technical field [0001] The invention relates to the field of melamine foam plastics, and furthermore, relates to a special resin liquid for hydrophobic melamine foam, a preparation method and a foaming liquid prepared therefrom. Background technique [0002] Melamine foam is an intrinsically high flame-retardant foam material, because of its excellent sound absorption, noise reduction, heat insulation, high temperature resistance, low smoke rate, chemical corrosion resistance, convenient post-processing, etc. Its performance makes it widely used in more and more fields such as architectural decoration, public places, electromechanical equipment, and transportation vehicles. [0003] At present, the commonly used foam materials (such as polyurethane, polystyrene, etc.) not only have poor flame retardancy, but also produce a lot of smoke and toxic gases in a fire. According to statistics, more than 80% of fire deaths are related to inhalation of toxic fumes. Melamine foam ca...

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Problems solved by technology

[0010] Although the above-mentioned patents or published technologies have proposed methods for preparing hydrophobic melamine foams, the preparation of hydrophobic soft melamine is all methods of dipping or spraying. These methods are complicated in process, high in production cost, and the product is only surface-repellent, and the product quality is not stable. Only the surface layer is hydrophobic, once the product is damaged or after a long period of time, its hydrophobic performance will decrease or even disappear completely; melamine rigid foam can be prepared by modifying melamine formaldehyde resin, but only with a volume density of 22-50g.cm -3 The rigid foam and the bulk density range is only 35 ~ 40g.cm -3 The maximum tensile strength of the hard foam is 0.063Mpa, and the water absorption rate is 6%. Other hard foams have poor performance and cannot meet the requirements of construction, transportation (such as seats and parts of automobiles, aircraft, etc.) and other fields.

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