Preparation method for composite polymer film with high thermal conductivity

[0022] With reference to accompanying drawing, a kind of preparation method of high thermal conductivity composite polyethylene film comprises the following steps:

[0023] 1) Mix high thermal conductivity particles and polymer particles at a mass ratio of 1:10, and use an injection molding process to obtain the first polymer film 3 containing high thermal conductivity particles or fibers, the high thermal conductivity particles are Ag particles, and the polymer particles are polyethylene PE;

[0024] 2) Place the first polymer film 3 prepared in step 1) on the porous template 4, then put the porous template 4 into the vacuum heating box 1, and the vacuum heating box 1 keeps 130 0 constant temperature;

[0025] 3) After the first polymer film 3 is melted, the porous template 4 is filled under the joint action of capillary force and the external pressure provided by the pressurizing device 2 to form a second polymer film;

[0026] 4) After 30 minutes, the obtained porous templat

[0032] With reference to accompanying drawing, a kind of preparation method of high thermal conductivity composite polyethylene film comprises the following steps:

[0033] 1) Mix high thermal conductivity fibers and polymer particles in a ratio of 1:5, and use a compression molding process to obtain the first polymer film 3 containing high thermal conductivity particles or fibers, the high thermal conductivity fibers are carbon fibers, and the polymer particles are polyethylene PE;

[0034] 2) Place the first polymer film 3 prepared in step 1) on the porous template 4, then put the porous template 4 into the vacuum heating box 1, and keep the vacuum heating box 1 at a constant temperature of 150°C;

[0035] 3) After the first polymer film 3 is melted, the porous template 4 is filled under the joint action of capillary force and the external pressure provided by the pressurizing device 2 to form a second polymer film;

[0036] 4) After 60 minutes, the obtained porous template 4 c

[0042] With reference to accompanying drawing, a kind of preparation method of high thermal conductivity composite polypropylene film comprises the following steps:

[0043] 1) Mix high thermal conductivity fibers and polymer particles in a mass ratio of 1:1, and use an injection molding process to obtain the first polymer film 3 containing high thermal conductivity particles or fibers. The high thermal conductivity fibers are AIN whiskers, and the polymer particles are Polypropylene PP;

[0044] 2) Place the first polymer film 3 prepared in step 1) on the porous template 4, then put the porous template 4 into the vacuum heating box 1, and keep the vacuum heating box 1 at a constant temperature of 180°C;

[0045] 3) After the first polymer film 3 is melted, the porous template 4 is filled under the joint action of capillary force and the external pressure provided by the pressurizing device 2 to form a second polymer film;

[0046] 4) After 90 minutes, the obtained porous templa