A special resin liquid for hydrophobic melamine foam, preparation method and foaming liquid prepared therefrom

Abstract

The invention discloses a special resin liquid for hydrophobic melamine foam, a preparation method and a foaming liquid prepared therefrom. The special resin liquid is obtained by polymerizing raw materials including the following components: 100 parts by weight of melamine; 40-100 parts by weight of formaldehyde; more than 0-10 parts by weight of modified monomers and / or functional compounds; 1-3 parts by weight of catalyst; 50-80 parts by weight of water. The present invention can prepare the density in 6~100kg / m 3 Controllable and adjustable soft, semi-rigid and rigid hydrophobic melamine foam, density <20kg / m 3 The water absorption rate of soft melamine foam is less than 10%, the contact angle is more than 120 (°), and the density is more than 25kg / m 3 The semi-rigid and rigid melamine foam has a water absorption rate of <5%, a contact angle of >130 (°), and a tensile strength of >120kpa.

Description

technical field [0001] The invention relates to the field of melamine foamed plastics, and further 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 a natural and highly flame-retardant foam material with intrinsic type, because of its excellent sound absorption, noise reduction, heat insulation, high temperature resistance, low smoke rate, chemical resistance, convenient post-processing, etc. Its performance makes it widely used in more and more fields such as architectural decoration, public places, mechanical and electrical equipment, and transportation vehicles. [0003] At present, the commonly used foam materials (such as polyurethane, polystyrene, etc.) in addition to their poor flame retardant properties, produce a lot of smoke and toxic gases in fires. Statistics show that more than 80% of fire deaths are related to inhalation of toxic fumes. ...

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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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