A kind of flame retardant foaming agent and its preparation method and application

Abstract

The invention discloses a flame-retardant foaming agent and a preparation method thereof. The preparation method includes evenly mixing a two-dimensional nano material with polyhydric alcohol, reacting the two at 80-120 DEG C for 2-4 hours, adding a solubilizing aid and hydroxy silica gel, and evenly mixing to obtain the flame-retardant foaming agent. The flame-retardant foaming agent comprises, by mass, 0.1-1% of the two-dimensional nano material, 30-60% of the polyhydric alcohol, 0.1-1% of the solubilizing aid and 30-70% of the hydroxy silica gel. The invention also discloses a flame-retardant silicone rubber foam material. The flame-retardant foaming agent serves as a foaming aid for the flame-retardant silicone rubber foam material. The flame-retardant silicone rubber foam material comprises, by mass, 5-25% of hydrogen-containing silicone oil, 10-65% of the hydroxy silica gel, 0.1-10% of the foaming aid, 0.001-4% of inhibitors, 5-50% of vinyl silicone oil and 0.1-3% of catalysts. The flame-retardant foaming agent is green and environmentally friendly, the preparation process is simple, and the obtained flame-retardant silicone rubber foam material has a good application prospect in the fields such as aerospace, rail traffic, automobiles, and electronic and electrical appliances.

Description

technical field [0001] The invention relates to the field of silicone foam materials, in particular to a flame retardant foaming agent and its preparation method and application. Background technique [0002] In recent years, with the rapid development of the aviation field and the frequent occurrence of fire accidents in aircraft and buildings, it is urgent to develop a multifunctional material with good mechanical properties, high and low temperature resistance and flame retardancy. Foam materials (such as polyurethane, polystyrene foam, melamine foam, etc.) have the advantages of light weight, good elasticity, and low price. They are ideal filling materials, but they have certain shortcomings and limitations, such as poor high and low temperature resistance. , easy to burn and produce toxic substances after burning, endangering human health, etc. [0003] Silicone rubber material is composed of "Si-O-Si" structure as the main skeleton. Due to the large bond energy betwee...

AI Technical Summary

Problems solved by technology

[0004] 1. Physically blending and adding inorganic or organic flame retardants in the silicone rubber matrix: the patent specification with the publication number CN 106589956 A discloses a low-density flame-retardant silicone rubber foam material and its preparation method. In the silicone rubber foam matrix Add 10-50 parts of aluminum hydroxide and 10-50 parts of ammonium polyphosphate organic flame-retardant filler. Although the flame-retardant effect is good, high content filling will cause density increase and strength deterioration, which is not conducive to the demand for light weight and high strength.

However, the filling of nano fillers will greatly increase the viscosity of the system, making the processing more difficult, and it is difficult to obtain excellent flame retardant effects.

[0005] 2. Realize the intrinsic flame retardancy of materials by chemical methods: the patent specification with publication number CN 107141806 A discloses a preparation method of intrinsic flame retardant silicone rubber foam material, which is modified by bromination of silicone oil, The intrinsic flame retardancy of materials is realized by chemical methods. Although this invention can effectively improve the flame retardancy effect of silicone rubber foam materials, the existence of halogens has a potential hazard to the environment, and a toxic substance will be released after burning to endanger the human body. Health and Environmental Safety

[0006] 3. Apply one or more layers of flame retardant coating on the surface of the material by using layer by layer self-assembly technology: Wang Yuzhong and others assembled multi-layer chitosan on silicone rubber foam by layer by layer self-assembly technology / ammonium polyphosphate and chitosan / montmorillonite nano-coating, prepared a flame-retardant silicone rubber foam material (DOI: 10.1021 / acs.iecr.6b00532), but the preparation process is more complicated, difficult to scale, and coating at the same time The coating content is still high, and there are also disadvantages such as poor reliability of the interface between multi-layer coatings and the substrate.

[0008] It can be seen from the above prior art that most of the existing silicone rubber foam materials are added with a large amount of inorganic or organic flame retardants, which destroy the cell structure, affect the resilience and density of the material, or use chemical modification elements that are not friendly to the environment such as halogens. to achieve effective flame retardant

However, how to prepare a silicone rubber foam material with excellent flame retardancy and excellent mechanical properties through ultra-low addition of flame retardants is still an important challenge.

Images