Preparation method of para-aramid and meta-aramid electrical insulation paper
A technology of electrical insulation and para-aramid, which is applied in the field of preparation of para-aramid electrical insulating paper, which can solve the problems of poor mechanical strength performance, poor paper dielectric performance, and poor insulation performance of aramid paper. Achieve the effects of regular and orderly arrangement of molecular chains, improved paper tightness, and improved strength properties
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[0029] A preparation method of the para-meta-aramid electrical insulating paper of the present invention specifically comprises the following steps:
[0030] Step 1, pretreating the para-aramid chopped fibers for subsequent use;
[0031] The pretreatment process of para-aramid chopped fibers is as follows: the para-aramid chopped fibers are mixed at a molar concentration of 1.0×10 - 3 mol / L~3×10 -3 mol / L, soak in sodium dodecylbenzenesulfonate solution at 40°C-60°C for 0.5h-1h, then wash with water for 3-5 times, and finally dry in a vacuum drying oven at 100°C-105°C until absolutely dry .
[0032] Step 2, pretreating the meta-aramid chopped fibers;
[0033] The pretreatment process of meta-aramid chopped fibers is as follows: the molar concentration of meta-aramid chopped fibers is 1.0×10 - 3 mol / L~3×10 -3 mol / L, soak in sodium dodecylbenzenesulfonate solution at 40°C-60°C for 0.5h-1h, then wash with water for 3-5 times, and finally dry in a vacuum drying oven at 100°C...
Embodiment 1
[0045] The para-aramid chopped fiber is pretreated, and the pretreatment process is: the para-aramid chopped fiber is prepared at a molar concentration of 1.0×10 -3 mol / L, soaked in sodium dodecylbenzenesulfonate solution at 40°C for 0.5h, then washed 3 times with water, and finally dried in a vacuum oven at 100°C to dryness for later use; The fiber is pretreated, and the pretreatment process is as follows: the meta-aramid chopped fiber is mixed at a molar concentration of 1.0×10 -3 mol / L, temperature of 40 ℃ sodium dodecylbenzene sulfonate solution soaked for 0.5h, then washed 3 times, and finally dried in a vacuum oven at 100 ℃ to absolute dryness; weighed 1.27g pretreated absolute Dry para-aramid chopped strands and meta-aramid chopped fibers are deflagged for 15000r in a deflagging machine, and the deflaking concentration is controlled at 0.3% by mass (absolutely dry para-aramid chopped fibers and meta-aramid chopped fibers The total mass is 1.27g), wherein the mass ratio...
Embodiment 2
[0047] The para-aramid chopped fiber is pretreated, and the pretreatment process is: the para-aramid chopped fiber has a molar concentration of 3.0×10 -3 mol / L, soaked in sodium dodecylbenzenesulfonate solution at 60°C for 1 hour, then washed with water for 5 times, and finally dried in a vacuum oven at 105°C until absolutely dry, and set aside; para-aramid chopped fibers Perform pretreatment, the pretreatment process is: the molar concentration of meta-aramid chopped fibers is 3.0×10 -3 mol / L, soaked in sodium dodecylbenzenesulfonate solution at 60°C for 1 hour, then washed with water for 5 times, and finally dried in a vacuum oven at 105°C to absolute dryness; weighed 1.27g of pretreated absolute dryness Para-aramid chopped fibers and meta-aramid chopped fibers are deflagged for 25000r in a deflagging machine, and the deflaking concentration is controlled at 0.3% by mass (the absolute dry para-aramid chopped fibers and meta-aramid chopped fibers Gross mass is 1.27g), wherei...
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