A kind of toughened flame-retardant phenolic resin, phenolic foam material and preparation method thereof
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A technology of phenolic foam material and phenolic resin, which is applied in the field of polymer chemical industry to achieve the effects of improving toughness, improving drawing resistance, and promoting crosslinking density
Active Publication Date: 2020-08-21
XINJIANG MAX TECH DEV
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It can be seen that toughening and flame retardancy are often difficult to have at the same time. At present, there is no A-grade phenolic foam material available
Method used
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preparation example Construction
[0060] According to the preparation method of the present invention, the main performance indicators that the phenolic foam material reaches are as follows:
[0061]
[0062]
Embodiment 1
[0065] The specific operation steps are as follows:
[0066] (1) Synthesis of expandable phenolic resin:
[0068] Weigh 2kg of phenol, put it into the reaction kettle, heat up to 65°C to melt, while stirring, add 1kg of paraformaldehyde at a certain speed, and stir at 35°C for 35min;
[0069] Then add 0.05kg of potassiumhydroxide solution with a mass fraction of 20%, stir at 65°C for 2.5h, and stir evenly;
[0070] Finally, 0.01kg of deep eutectic solvent was added, and the temperature in the reaction kettle was increased to 80°C, and stirred for 1.5h to obtain the expandable phenolic resin, that is, the phenolic resin described above. The phenolic resin was viscous, and at 25°C , the viscosity is 3000Pa·S.
[0071] (2) Foaming and curing expandable phenolic resin: ...
Embodiment 2
[0076] The specific operation steps are as follows:
[0077] (1) Synthesis of expandable phenolic resin:
[0079] Weigh 6kg of phenol, put it into the reaction kettle, heat up to 75°C to melt, while stirring, add 3kg of paraformaldehyde at a certain speed, and stir at 50°C for 25min;
[0080] Then add 0.5kg of 20% sodiumhydroxide solution and 0.5kg of 20% bariumhydroxide solution, stir at 75°C for 1.5h, and stir evenly;
[0081] Finally, 1 kg of deep eutectic solvent was added, and the temperature in the reactor was raised to 100° C., and stirred for 2.5 hours to obtain a expandable phenolic resin, that is, the phenolic resin. At 25° C., the viscosity of the phenolic resin was 5000 Pa·S.
[0082] (2) Foaming and curing expandable phenolic resin:
[0083]Add 7kg of phe...
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Abstract
The invention relates to toughened flame-retardant phenolic resin, a toughened flame-retardant phenolic foam material and preparation methods of the toughened flame-retardant phenolic resin and toughened flame-retardant phenolic foam material. The preparation method of the toughened flame-retardant phenolic resin comprises the steps: compounding metalhalide with organic polyol so as to obtain a eutectic solvent, adding the eutectic solvent at the synthesis stage of expandable phenolic resin, and performing modification so as to obtain the expandable phenolic resin which is the toughened flame-retardant phenolic resin under the action of a basic catalyst. The invention also discloses the toughened flame-retardant phenolic foam material and preparation method thereof. According to the toughened flame-retardant phenolic resin, toughened flame-retardant phenolic foam material and preparation method thereof, the eutectic solvent formed by the metalhalide and polyol is adopted as a modifier so as to modify the phenolic foam material, so that the toughness of the product is improved, the oxygen index of the foam material is increased significantly, and two properties of flame retardanceand toughening of the phenolic foam material are improved.
Description
technical field [0001] The invention belongs to the field of polymerchemical industry, and in particular relates to a toughened and flame-retardant phenolic resin, a phenolic foam material and a preparation method thereof. Background technique [0002] Fires frequently occur in high-rise buildings in my country, causing huge property losses and casualties. At present, the flame retardancy of building materials has become a hot spot at home and abroad. With the further improvement of my country's building materials for energy-saving / insulation and flame-retardant performance requirements, the demand for flame-retardant exterior wall insulation materials will further increase. Phenolic resin foam insulation material has excellent properties such as flame retardancy, light weight, and safety. It is a kind of high-quality and low-cost self-flame-retardant foam plastic. With the advantages of high thermal stability, low smoke density and low toxicity, low thermal conductivity,...
Claims
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