Intumescent flame-retardant coating for cables and preparation method of intumescent flame-retardant coating

Abstract

The invention discloses an intumescent flame-retardant coating for cables and a preparation method of the intumescent flame-retardant coating. The intumescent flame-retardant coating for cables comprises the following raw materials: a component A including a base material, namely, 20.0-25.0 parts by weight of silicone acrylic emulsion; a component B including an acid source, namely, 25.0-27.5 parts by weight of ammonium polyphosphate, a carbonizing agent, namely, 15.0-16.5 parts by weight of pentaerythritol, a foaming agent, namely, 15.0-16.5 parts by weight of melamine, and auxiliaries, namely, 3.0-5.0 parts by weight of expandable graphite, 6.0-8.0 parts by weight of phthalocyanine and 12.0-16.0 parts by weight of silane coupling agent modified Fe2O3; and a component C including 4.0-6.0 parts by weight of a curing agent. The preparation method of theintumescent flame-retardant coating for cables comprises the steps of a, preparing silane coupling agent modified Fe2O3; b, uniformly mixing silane coupling agent modified Fe2O3, expandable graphite, phthalocyanine, ammonium polyphosphate, pentaerythritol and melamine to obtain a component B; c, adding the component B into the component A, uniformly stirring to obtain a component A and component B mixture, and sealing; d, sealing the component C; and e, mixing the mixture of the component A and the component B with the component C during use to obtain the intumescent flame-retardant coating for cables.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant coatings for cables, and in particular relates to a flame-retardant coating for intumescent cables and a preparation method thereof. Background technique [0002] Cable trenches are underground pipelines used to lay and replace power or telecommunication cable facilities. Fires in cable trenches often cause huge economic losses and even casualties. [0003] There are two reasons for cable trench fire accidents. One is the fire caused by the cable itself. ditch fire, external factors include construction sparks, poor ventilation, etc. Generally speaking, after the cable laying in the cable trench is completed, we focus on prevention of external factors, and it is difficult for us to avoid the fire caused by the cable itself by controlling the external factors. Therefore, it is necessary to strengthen the protection of the cable itself. fire resistance. [0004] Cable fireproof coating is...

AI Technical Summary

Problems solved by technology

[0017] We can see that with Fe 2 o 3 As the dosage increases, the foaming ratio of the paint will gradually decrease, because it will react with the acid source, which makes it difficult for the acid source to react with the carbonizing agent to dehydrate, so that the foaming ratio of the paint will decrease. The reason why the fire resistance limit rises first and then falls is because it can increase the strength of the foam layer while reducing the foaming ratio of the coating, ensuring the stable existence of the foam layer and ensuring the fire resistance effect. When ensuring the stable existence of the foam layer, the positive income When it is higher than the negative income brought by the decrease of the expansion ratio, the fire resistance limit increases. When the positive income of ensuring the stable existence of the foam layer is lower than the negative income brought about by the decrease of the expansion ratio, the fire resistance limit shows a downward trend, thus , the optimal solution is 6% addition, but this is the optimal solution under the limitation of the current technical solution

In fact, generally speaking, the existing intumescent fire retardant coatings still avoid the choice of Fe 2 o 3 Series of pigments and fillers, because with and without Fe 2 o 3 Compared with intumescent fireproof coatings with series of pigments and fillers, adding Fe 2 o 3 Series of pigments and fillers will indeed reduce its fire resistance to a certain extent