Preparation method of metal modified phenolic aldehyde based polyurethane foam
A phenolic-based polyurethane and metal modification technology, applied in the field of metal-modified phenolic-based polyurethane foam, can solve the problems of the influence of polyurethane strength, difficult to control the degree of crosslinking, uncontrollable structure of thermosetting phenolic polyol, etc. The effect of shortening the test cycle and improving thermal and mechanical properties
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Embodiment 1
[0021] Heat phenol and molybdic acid to 50°C under the action of hydrochloric acid, and react for 0.5h to generate phenyl molybdate, wherein the mass ratio of phenol:molybdic acid is 100:1, and the mass ratio of phenol:hydrochloric acid is 100:0.2; molybdenum Phenyl acetate and formaldehyde (the mass ratio of phenol to formaldehyde is 100:20) reacted under the catalysis of zinc acetate (phenol is calculated as 100, zinc acetate is 0.2) for 1 hour, and then hydrochloric acid (phenol is calculated as 100, hydrochloric acid is 0.3 ) reaction for 0.2h, then dehydration under reduced pressure, the temperature dropped to 30°C within 0.3h, then raised to 50°C within 0.1h, kept at constant temperature for 0.1h, and the vacuum degree was 8000Pa to obtain low molecular weight molybdenum modified molybdenum with a molecular weight of 340 High ortho thermoplastic phenolic polyol.
[0022] The obtained molybdenum-modified phenolic polyol and catalyst N,N-dimethylcyclohexylamine, foaming ag...
Embodiment 2
[0025] Heat phenol and molybdenum trichloride to 100°C under the action of sulfuric acid, and react for 6 hours to generate molybdate, wherein the mass fraction ratio of phenol to molybdenum trichloride is 100:40, and the mass ratio of phenol to sulfuric acid is 100: 2. Molybdate and formaldehyde (the mass ratio of phenol and formaldehyde is 100:40) are reacted for 6 hours under the catalysis of calcium oxide (phenol is calculated as 100, and calcium oxide is 1), and then concentrated sulfuric acid is added (phenol is calculated as 100, Concentrated sulfuric acid is 2) react for 5 hours, then dehydrate under reduced pressure, the temperature drops to 60°C within 1 hour, then rises to 90°C within 2 hours, keeps the temperature for 2 hours, and the vacuum degree is 400Pa to obtain low molecular weight molybdenum modification with a molecular weight of 840 High ortho thermoplastic phenolic polyol.
[0026] The obtained molybdenum-modified phenolic polyol, catalyst stannous octoat...
Embodiment 3
[0029] Heat m-cresol and tetramethyl titanium oxide under the action of phosphoric acid to 100°C and react for 6 hours to generate a titanium modified product. The mass fraction ratio of m-cresol and tetramethyl titanium oxide is 100:40, m-cresol The mass ratio of phenol and phosphoric acid is 100:2; the titanium modified product reacts with formaldehyde (the mass ratio of m-cresol and formaldehyde is 100:30) under the catalysis of oxalic acid (m-cresol is calculated as 100, and oxalic acid is 3) 6h, then dehydration under reduced pressure, the temperature dropped to 60°C within 1h, then raised to 90°C within 2h, kept at a constant temperature for 2h, and the vacuum degree was 400Pa, to obtain titanium-modified high-ortho thermoplastic phenolics with a molecular weight of 740 Polyol.
[0030] The obtained titanium modified phenolic polyol and catalyst dibutyltin dilaurate, blowing agent hydrofluorocarbon HFC S , Silicone oil foam stabilizer as component A and PAPI of componen...
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