Preparation method for nitrogen-containing silica sol synergistic phosphorus flame-retardant epoxy acrylate coating layer

Abstract

The invention discloses a preparation method for a nitrogen-containing silica sol synergistic phosphorus flame-retardant epoxy acrylate coating layer. The method uses glycidyl methacrylate, phosphoricacid, KH-570 and KH-550 as raw materials to prepare a phosphorus-containing substance TGMAP and a nitrogen-containing silica sol; and the phosphorus-containing substance TGMAP, the nitrogen-containing silica sol and epoxy acrylate are mixed, ultraviolet light curing is performed, and therefore the epoxy acrylate coating layer containing P-N-Si is prepared. The structure, thermal stability and flame retardance of the composite EA coating layer provided by the invention are characterized by an infrared spectrometer, a limiting oxygen index meter and a vertical burning tester, and results show that in the epoxy acrylate coating layer prepared by the method provided by the invention, the nitrogen-containing silica sol is not changed, and as the TGMAP increases, a carbon residual rate and an expansion multiple are increased significantly, after flame time becomes shorter obviously, and an LOI value is increased obviously; and the results indicate that the N-containing silica sol and the TGMAP have a good synergistic flame-retardant effect.

Description

technical field [0001] The invention relates to the technical field of flame retardant materials, in particular to a method for preparing a nitrogen-containing silicon sol in conjunction with a phosphorus flame retardant epoxy acrylate coating. Background technique [0002] Flame-retardant coatings can be applied to the surface of materials that are relatively easy to burn, such as wood, plastics, and cables. It can not only retain the properties of the material itself, but also provide fire protection for the material. The flame retardant mechanism of flame retardant coatings is generally divided into the following categories: (1) Endothermic effect: when an object is burned, a flame retardant with a high ignition point will undergo endothermic decomposition reactions such as dehydration, phase change, or dehalogenated oxygen during the combustion process. , causing the heat on the surface of the coating and the heat in the flame area to be absorbed, thus reducing the rate ...

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Problems solved by technology

Halogenated flame retardants, although their flame retardant effect is remarkable, the dosage is small, and the cost is low, but halogen-containing flame retardants will produce a large amount of toxic gases at high temperatures, which not only damages the environment, but also poses a threat to human safety

Phosphorus-based flame retardants do not produce toxic gases, and phosphorus elements have a good synergistic effect with nitrogen and silicon elements. The compounded phosphorus-nitrogen and nitrogen-silicon flame retardant EA has the characteristics of low smoke and non-toxicity, but adding Type phosphorus-containing flame retardants usually need to be added in large amounts (20%-40%)

Nitrogen-based flame retardants release a large amount of non-combustible gases at high temperatures, such as carbon dioxide, ammonia, nitrogen monoxide, nitrogen dioxide, nitrogen, etc., and have a good intumescent flame-retardant effect, but because nitrogen dioxide easily forms nitric acid when it meets water, Ammonia gas is easy to form ammonia water when it meets water, which has a certain impact on some materials that are not resistant to acid and alkali.

Silicon-based flame retardants form a stable silica carbonized layer at high temperature, which has the characteristics of low burning rate, low heat release, low smoke, and non-toxicity, but the compatibility between inorganic silicon flame retardants and substrates is poor

At present, flame retardant EA coatings are only prepared based on phosphorus, nitrogen, and silicon flame retardants, but few people have studied flame retardants that use the three elements at the same time.

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