Application of Boehmite in flame Retardant and heat conduction industry
the role of Boehstone BG can play a strengthening role in the polymer, can improve the flame retardant, thermal deformation temperature, thermal conductivity of the composite.PA6/BG nanocomposites were prepared by in-situ polymers. When the BG mass fraction was 15%, the tensile elastic modulus of the materials was up to 4230MPa, almost twice that of pure PA6. The thermal deformation temperature (HDT) of the composites increased from 67℃ to 155℃ of pure PA6.
In the silica gel system, the thermal conductivity of silicone rubber is 0.85W(mK) when the BG is filled with 200 parts, while the BG with mohs hardness is only 3.5 can overcome the disadvantage that alumina is easy to wear screws.
As AIOOH is the main component of blomite, it has good thermal stability. In the process of heating, on the one hand, it will decompose to produce water vapor, absorb a lot of heat, and dilute the flammable gas.On the other hand, Al203 can be produced to cover the surface of the material to play the role of heat insulation and oxygen isolation.
1. The limit oxygen index (LO1) can be increased to 30% by using 37.5% of One-stone-BG Boomstone in PVAL.One Stone BG Boomer stone can enhance the carbonization of PVAL and improve the flame retardant of solid phase.
2. The thermal stability of the material and the LOI of the material can be significantly improved by introducing 10% brumstone into the epoxy resin.
3. PA6 / Boehstone composites with 2% mass fraction were prepared by melt extrusion in nylon system, and the LOI of the materials increased by 7.0%
4. The PA66 system is filled with 50% Boehstone, which can improve the thermal conductivity of the material to 0.75w/(m-K), and the flame retardant level of the material reaches V-0.
5. The tensile strength and bending strength of the material are basically unchanged when boomerstone and MPP AIPi flame retardant PA66 /GF are used.
6, boehmite and MPP according to the proportion of 1:1 constitute a binary association effect, coordinated effect AIPi flame retardant PA66 / GF, compared to all adopt the MPP system, carbon layer density significantly increased, material pHRR from 279.4 kw to 158.6 kw/m2 / m2 decreased while the unit mass loss material amount of smoke from 105.9 g - lower compared to 87.1 g - 1 shows that boehmite MPP has better smoke suppression effect.
7. Under the premise of constant vertical combustion grade, boomerstone and MPP can reduce the dosage of AIPi and MPP.
8. Partial replacement of MPP with boehmite has no effect on the precipitation of AlPi flame retardants, but it can effectively reduce the precipitation amount of MPP flame retardants in the process of wet and hot aging, which is of great significance for improving the stability of the material and extending the service life of the material.
