Polyurethane synthetic leather for high-grade electronic packages and certificates

[0026] 1) Mix 40 parts of silicone-modified polyurethane prepolymer, 10 parts of polyisocyanate and 1.5 parts of accelerator triethylenediamine and stir evenly to obtain a colorless and transparent slurry with a viscosity of 500CPS / 25°C;

[0027] 2) the above-mentioned colorless transparent slurry is coated on the outer surface of the polyurethane synthetic leather base with 140 purpose printing rollers;

[0028] 3) Then dry it at 80°C and then cure it at 130°C for 5 minutes to obtain polyurethane synthetic leather.

[0029]

[0031] 1) Mix 80 parts of silicone-modified polyurethane prepolymer, 15 parts of polyisocyanate and 1.0 parts of accelerator dibutyltin dilaurate and stir evenly to obtain a colorless and transparent slurry with a viscosity of 800CPS / 25°C;

[0032] 2) the above-mentioned colorless transparent slurry is coated on the outer surface of the polyurethane synthetic leather base with 160 purpose printing rollers;

[0033] 3) Then dry it at 100°C and then cure it at 150°C for 3 minutes to obtain polyurethane synthetic leather.

[0034]

[0036] 1) Mix 100 parts of silicone-modified polyurethane prepolymer, 20 parts of polyisocyanate and 2 parts of accelerator stannous octoate and stir evenly to obtain a colorless and transparent slurry with a viscosity of 200CPS / 25°C;

[0037] 2) the above-mentioned colorless transparent slurry is coated on the outer surface of the polyurethane synthetic leather base with 120 purpose printing rollers;

[0038] 3) Then dry it at 90°C and then cure it at 140°C for 4 minutes to obtain polyurethane synthetic leather.

[0039] The performance indexes of the polyurethane synthetic leather prepared in the above examples 1-3 are compared with the existing polyurethane synthetic leather as shown in the following table:

[0040]

[0041] As can be seen from the above table, the polyurethane synthetic leather for high-grade electronic packaging and certificates of the present invention has excellent touch, yellowing resistance, and wear resistance compared with ordinary packaging leat...