Durable fluoride-free waterproof agent and preparation method thereof
A fluorine-free water repellent, durable technology, applied in the field of textile auxiliaries, can solve the problems of increasing the amount of paraffin compound water repellent, difficult to achieve the ideal washing resistance effect, paraffin wax does not have reactive groups, etc., to improve the bonding strength. degree, reduced dosage, and obvious waterproof effect
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Embodiment 1
[0026] Preparation of blocked isocyanate condensate aqueous dispersion:
[0027] Take 67.64 parts of toluene diisocyanate (TDI), 14.84 parts of trimethylolpropane, feed nitrogen, react at 80-90°C for 1.5h, take samples to measure the content of free isocyanate, then add 19.8 parts of tartaric acid to the system, and react at 90°C Carry out the chain extension reaction for 2 hours, then add 10.75 parts of methyldiethanolamine, and continue the chain extension reaction at 80°C for 2 hours to obtain a polyurethane prepolymer. The free isocyanate content f-NCO% of the prepolymer is 4~15%. Then 8.96g of methyl ethyl ketone oxime was added and reacted at 80°C for 2.5h to obtain a blocked isocyanate condensate. Cool down to 60°C, add 5 g of glacial acetic acid into the reactor and stir evenly, then add 228.5 parts of deionized water for high-speed, high-shear emulsification for 40 minutes to obtain a blocked isocyanate condensate dispersion.
[0028] Preparation of Hydrophobic Compo...
Embodiment 2
[0032] The preparation of the aqueous dispersion of blocked isocyanate condensate is the same as in Example 1.
[0033] Preparation of Hydrophobic Compound Emulsions Containing Reactive Functional Groups:
[0034] 8 parts of octadecylamine, 20 parts of stearyl glycidyl ether, 2 parts of ethoxylated tallow quaternary ammonium salt, 1.5 parts of Tween 80, heated to 60 °C and mixed evenly, added 2 g of glacial acetic acid, added 60 °C heat 61 parts of deionized water were emulsified for 1 hour, cooled rapidly and homogenized by a high-pressure homogenizer to obtain a hydrophobic compound emulsion containing reactive functional groups.
[0035] Preparation of fluorine-free water repellent: Take 30% of the above-mentioned blocked isocyanate condensate dispersion, 50% of the hydrophobic compound emulsion containing reactive functional groups, and 20% of deionized water to obtain a permanent fluorine-free water repellent.
Embodiment 3
[0037] The preparation of the aqueous dispersion of blocked isocyanate condensate is the same as in Example 1.
[0038] Preparation of Hydrophobic Compound Emulsions Containing Reactive Functional Groups:
[0039] 8 parts of octadecyl alcohol, 20 parts of N-methylol stearamide, 2 parts of ethoxylated tallow quaternary ammonium salt, 1.5 parts of Tween 80, put into the autoclave, heat to 120 ° C and mix well, gradually add 98 61 parts of hot deionized water at 100°C for 1 hour, and the product was rapidly cooled and homogenized by a high-pressure homogenizer to obtain a hydrophobic compound emulsion containing reactive functional groups.
[0040] Preparation of fluorine-free water repellent: take 30% of the above-mentioned blocked isocyanate condensate dispersion, 50% of hydrophobic compound emulsion containing reactive functional groups, and 20% of deionized water, and compound to obtain a permanent fluorine-free water repellent sample.
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