Polyamide composite material with high thermal conductivity and high heat resistance and preparation method thereof
A composite material and polyamide technology, which is applied in the field of high thermal conductivity and high heat resistance polyamide composite materials and their preparation, can solve the problems of low thermal conductivity of thermally conductive PA and insufficient heat resistance, and achieve good thermal conductivity and improved thermal conductivity. The effect of low thermal conductivity and filler cost
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Embodiment 1-6
[0034] A polyamide composite material formula with high thermal conductivity and high heat resistance and a preparation method thereof, comprising the following steps:
[0035] (1) Prepare materials according to the components and contents in Table 1. The halogen-free flame retardants are red phosphorus and phosphorus-based composite flame retardants; boron nitride is hexagonal boron nitride with a size of 5 microns; alumina It is thermally conductive spherical alumina with a size of 50 microns; the graphite is flake graphite with a size of 104 microns; the coupling agent is a silane coupling agent; the antioxidant is a composite system of hindered phenolic antioxidant and phosphite antioxidant ; The lubricating dispersant is a BAB type copolymer containing polar groups prepared from ethylene bis fatty acid amide (EBS) as the base material.
[0036] (2) Put the above raw materials into the high-mixer and mix them for 3-5 minutes, then discharge to obtain the mixture, then cont...
Embodiment 1
[0042] Example 1 is to add more polymer matrix and less flake graphite. According to the test results, we can see that the thermal conductivity of the material is low, but the surface resistance is high and the insulation is good. Embodiment 4 adds more flake graphite, and there is a suitable ratio between hexagonal boron nitride, spherical alumina and flake graphite flakes, the addition amount is suitable, can be processed easily, has very high thermal conductivity, and surface resistance It meets the insulation requirements, and the flame retardant performance reaches V0, and the high temperature resistance performance is good.
[0043] At the same time, we used no flame retardant system, a system filled with PA46 with boron nitride single thermal conductive filler and boron nitride and alumina binary composite thermal conductive filler, and a system with PA66 instead of PA46 polyamide as the matrix resin for comparison. , which shows the comprehensive advantages of the pres...
Embodiment 7
[0051] No flame retardant is added in Example 7, so the flame retardant performance of the composite material is greatly reduced and only reaches the V2 level; Example 8 adds less polymer matrix and single thermally conductive filler boron nitride, although there are many fillers added , but according to the test results, we can see that the thermal conductivity of the material is low; Example 9 uses binary composite thermal conductive fillers boron nitride and aluminum oxide to fill less PA46 matrix resin, and its thermal conductivity is also relatively low. Low. Compared with Example 4 with the same formulation, Example 10, which uses PA66 instead of PA46, has lower thermal conductivity and a greater drop in heat resistance.
[0052] It can be drawn from the above examples that the performance of the flame-retardant insulating heat-conducting plastic of the present invention is excellent, the flame-retardant performance can reach V0, and the surface resistance is between 10 ...
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