Melamine nano aerogel/CO2 foamed composite incombustible closed-pore rigid foam heat insulation board and preparation method thereof
A nano-airgel and melamine technology, which is applied to chemical instruments and methods, hydraulically coagulable material layered products, synthetic resin layered products, etc., can solve the problems of poor mechanical properties, high foam brittleness, high water absorption, etc., to achieve The effect of good product performance, low production cost and high mechanical strength
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Embodiment 1
[0032] (1) Preparation of hydrogel: Add 895g of melamine (M), 630g of paraformaldehyde (F), 500g of pure water, and 3g of catalyst NaOH into the reactor. The pH value is about 7-8, stir and heat up to 85-90°C, add 10g of stabilizer diethylene glycol, after the melamine is completely dissolved, add 90g of modifier p-toluenesulfonamide, emulsifier dodecylbenzenesulfonic acid React with 60g of sodium for 0.5 hours, adjust the pH value of the system to 1.5-2.0 with HCI, continue the reaction for 2 hours, lower the temperature below 60°C, put the reaction solution in a closed container, and age the gel at 50°C for about 7 hours. Trifluoroacetic acid solution was treated for 3 hours. In order to better replace it with carbon dioxide, the treated gel was replaced with absolute ethanol or acetone for 2 days, and the surface was modified with silicone water repellent to obtain a hydrophobic surface, and then replaced with absolute ethanol for 2 days , that is, a hydrophobic surface ge...
Embodiment 2
[0035](1) Add 1000g of distilled water into the reactor, and then sequentially add 5g of catalyst sodium hydroxide, 10g of buffer agent potassium dihydrogen phosphate, 20g of methenamine, 10g of stabilizer diethylene glycol, and the pH value is about 7-8, Stir and heat up to about 95°C, add melamine (M) 1790g, paraformaldehyde (F) 1260g, benzomelamine 250g, keep the temperature at 90-95°C, react for 2 hours, cool down to 50°C, add emulsifier α-ene Sodium sulfonate 120g, after reaction emulsification, add plasticizer dioctyl sebacate 60g, silicone water repellent 20g, after stirring evenly, use formic acid to adjust the pH value to about 2, then the material can be discharged, put the sol Subcritical drying can be carried out after aging in an environment of 50-60°C for 7 hours.
[0036] (2) Subcritical drying: Place the aged gel in an autoclave, immerse it in absolute ethanol, and close the autoclave. Slowly raise the temperature of the autoclave to 190°C while maintaining the...
Embodiment 3
[0038] Embodiment 3: foaming resin emulsion preparation process
[0039] 750g of melamine formaldehyde (MF) airgel powder prepared by the above process, 250g of distilled water, 75% of the solid content of the emulsion, 50g of emulsifier Tween-80, 10g of special dispersant, 10g of silicone water repellent, smoke suppressant Fumaric acid 50g, foaming agent carbon dioxide 80g, curing agent formic acid 10g, the above components are added in turn, high shear emulsification disperser, emulsified evenly, measured by single-screw extruder extruder, extruded by twin-screw extruder Exit and mix to obtain a highly uniform foaming resin emulsion. High-speed mixing and pouring head, high-speed mixing and foaming.
[0040] The foamed resin emulsion is processed through a polyurethane and phenolic foam composite insulation board continuous processing production line double crawler lamination molding device, at a temperature of 120-160 ° C, foamed for 10-15 minutes, cross-linked and formed,...
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