A kind of high-hardness metal temporary protective film and preparation method thereof
A protective film, high hardness technology, used in coatings, polyurea/polyurethane coatings, etc., can solve the problems of inability to suppress burrs, weak adhesion, etc. Effect
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Embodiment 1
[0071] In parts by weight, weigh 2000 parts of polyether diol, 1500 parts of diisocyanate (MDI), 1 part of dibutyltin dilaurate, stir at 90°C for 1 hour at low speed, and then add 30 parts of 1,4-butanediol , stirred at a low speed at 80°C for 1 hour, then added 5 parts of ethylenediaminopropanesulfonic acid and 500 parts of DMF, stirred at a low speed of 80°C for 4 hours, and made a prepolymer; then added 4500 parts of purified water and 30 parts of n-butyl Amine, stirred at 50°C for 2h (stirring rate is 3000r / min), static defoaming to obtain polyurethane resin; then add 1000 parts of aluminum hydroxide powder and 5 parts of associative thickener and stir at 1000r / min for 0.5h to obtain a composite polyurethane resin with a viscosity of 10,000 cps, and then spray the composite polyurethane resin on the surface of the metal plate with a thickness of 100 μm, bake at 60°C for 10 minutes, and then bake at 150°C for 5 minutes to prepare a high-hardness Metal temporary protective f...
Embodiment 2
[0074] In parts by weight, weigh 2000 parts of polyether diol, 1500 parts of diisocyanate (MDI), 1 part of dibutyltin dilaurate, stir at 90°C for 1 hour at low speed, and then add 30 parts of 1,4-butanediol , stirred at a low speed of 80°C for 1 hour, then added 5 parts of ethylenediaminopropanesulfonic acid and 500 parts of DMF, stirred at a low speed of 80°C for 4 hours, and made a prepolymer; then added 4500 parts of purified water and 50 parts of triethylene Amine, stirred at 50°C for 2h (stirring rate is 3000r / min), static defoaming, to obtain polyurethane resin; then add 1000 parts of silica powder and 5 parts of associative thickener and stir at 1000r / min for 1h, Obtain a composite polyurethane resin with a viscosity of 10,000 cps, and then spray the composite polyurethane resin on the surface of the metal plate with a thickness of 100 μm, bake at 60°C for 10 minutes, and then bake at 150°C for 5 minutes.
[0075] The high-hardness metal temporary protective film prepar...
Embodiment 3
[0077] In parts by weight, weigh and select 1500 parts of polyether diol, 2000 parts of diisocyanate (MDI), 1 part of dibutyltin dilaurate, stir at 90°C for 1 hour, and then add 32 parts of 1,4-butanediol , stirred at a low speed at 80°C for 1h, then added 3 parts of ethylenediaminopropanesulfonic acid and 500 parts of DMF, stirred at 80°C for 3h to make a prepolymer; then added 4500 parts of purified water and 40 parts of NaOH, in Stir at 500°C for 2h (stirring rate is 3000r / min), static defoaming, to obtain polyurethane resin; then add 1000 parts of silica powder and 5 parts of associative thickener and stir at 2000r / min for 0.5h to obtain the viscosity 10000cps composite polyurethane resin, and then spray the composite polyurethane resin on the surface of the metal plate, the thickness is controlled at 100μm, bake at 60°C for 10min, and then bake at 150°C for 5min.
[0078] The high-hardness metal temporary protective film prepared in this example is tested and found that t...
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