3 lines
1.7 KiB
JSON
3 lines
1.7 KiB
JSON
{
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"protocol": "步骤一，按质量份称取亲水环状聚硅氧烷、聚硅氮烷、固化剂、流平剂、溶剂；步骤二，在容器中加入溶剂，然后在搅拌状态下依次加入亲水环状聚硅氧烷、聚硅氮烷、流平剂和固化剂混合均匀即得所述防雾涂料。步骤一，按质量组分称取亲水环状聚硅氧烷、聚硅氮烷、固化剂、流平剂、溶剂；步骤二，在容器中加入溶剂，然后在搅拌状态下依次加入亲水环状聚硅氧烷、聚硅氮烷、流平剂和固化剂混合均匀即得所述防雾涂料。(a) Hydrophilic cyclic polysiloxane synthesis: In a 250 mL three-necked flask, add 69.7 g (0.1 mol) of glycerol ether propylene cyclic siloxane and start stirring; then add 21.0 g (0.2 mol) of diethanolamine to the above flask, and react at 80 degrees for 3 hours until the pH is neutral, yielding prepolymer 1. Another 1000 mL three-necked flask is taken, and 133.3 g (0.6 mol) of isophorone diisocyanate and 0.2 g (0.05 wt%) of dibutyltin dilaurate are added while stirring; then, mix 300.0 g (0.6 mol) of polyethylene glycol monomethyl ether 500 until fully dissolved, transfer to a constant pressure drop funnel, and slowly add to the flask at room temperature (the reaction is highly exothermic, control the drop rate to avoid local overheating). After the addition is complete, continue reacting at room temperature for 30 minutes, then raise to 70 degrees Celsius and react until the isocyanate (-NCO) content of the mixture reaches the theoretical value (measured by hydrochloric acid dibutylamine method) to obtain prepolymer 2. Add prepolymer 1 and continue the reaction until the isocyanate (-NCO) content is zero to obtain hydrophilic cyclic polysiloxane, then cool, dry, and store sealed."
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