Fiber-reinforced pure inorganic flame retardant foam composite and preparation method thereof

Abstract

The invention belongs to the technical field of composite preparation, and relates to a method for preparing a fiber-reinforced pure inorganic flame retardant foam composite. A glass fiber mat, a basalt fiber mat, an aluminum silicate fiber mat, an alumina fiber mat or a mullite fiber mat is used as a reinforcement, inorganic sol or solution, such as silica sol, alumina sol, water glass or an aluminum dihydrogen phosphate solution is used as an impregnating agent, and a microcapsule foaming method is used to prepare a low-density pure inorganic flame retardant foam composite plate. The method avoids the defects that the fiber content is low, the fiber dispersion is uneven, and the mechanical properties resulting therefrom are poor; the fiber in the composite is uniformly arranged, and the fiber mass content can reach 40-60%; the composite is good in mechanical property and formability; the density of the foam composite can be flexibly adjusted through adjusting the proportion of a microcapsule inflating agent added; the combustion level can reach the DIN5510 S5 grade.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and relates to a preparation method of a fiber-reinforced pure inorganic flame-retardant foam composite material. Background technique [0002] Due to the low relative density, high specific strength, high specific stiffness, good energy absorption, heat insulation, excellent damping and vibration reduction and noise reduction performance of foam materials, it is easy to realize lightweight and multi-functional structural materials. In engineering applications, it is often used as a sandwich material to reduce the weight of parts, and it is very suitable for the interior of railways, ships and luxury yachts. However, due to the low mechanical properties of pure foam, fiber reinforcement is often used to improve its mechanical properties in practical applications. [0003] The traditional fiber-reinforced foam composite is to mix a certain proportion of chopped fibers into ...

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this method is that it is limited by the viscosity of the components. The amount of fiber added cannot be too large, generally not more than 15% by mass, otherwise the viscosity of the components is too high, and the process operability will deteriorate, resulting in a decline in the final foam quality.

Secondly, the length of the fiber is limited, because the longer the fiber, the less likely it is to disperse evenly during the stirring process, and the easier it is to wrap around the stirring rod, causing difficulty in dispersing, making it difficult to ensure the uniformity of dispersion.

Third, in this method, the chopped fibers are distributed in a disordered state in the system, and the foam boards produced are all the same, which cannot take advantage of the strong designability of composite materials

[0005] The common feature of the above-mentioned patents is that organic polymers are used as adhesives. The presence of organic polymers makes the use temperature of this type of board lower (less than 500 ° C), and the flame retardancy level is lower (the highest can only reach S4 of DIN5110 standard. level, that is, self-extinguishing from the fire), which greatly limits the scope of use of this type of foam board

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