Compound water repellent containing tertiary amine polymer brush grafted nano silicon dioxide
A nano-silica, polymer brush technology, applied in the direction of repelling fiber, plant fiber, fiber treatment, etc. to liquid, can solve the problem of affecting the dispersion of latex particles, affecting the stability of water repellent, affecting the stability of emulsion, etc. problems, to achieve excellent comprehensive properties, overcome poor fastness, and improve the effect of dispersion stability
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Embodiment 1
[0051] Follow the steps below to prepare polymer brush grafted nano-silica for cationic water repellent compounding
[0052] (1) Nano silica double bond modification:
[0053] Preparation of nano silicon dioxide: under magnetic stirring, tetraethyl orthosilicate was added dropwise into a round bottom flask containing a mixed solution of ammonia water and ethanol with a constant pressure funnel, and the stirring reaction was continued at room temperature, and the reaction system became White, centrifuge the reacted silicon dioxide dispersion, get silica gel at the bottom of the centrifuge tube, add an appropriate amount of absolute ethanol again, ultrasonically disperse, centrifuge again, repeat 3 times, and vacuum dry to get nano silicon dioxide. Among them, the volume ratio of tetraethyl orthosilicate, ethanol, and ammonia water is controlled to be 1:34:2.5, and the reaction temperature is 30°C, so that nano-silica with a uniform particle size distribution of 100 nm can be ob...
Embodiment 2
[0065] (1) Nano silica double bond modification:
[0066] With reference to the method in embodiment 1, silicon dioxide dispersion liquid is obtained;
[0067] Heat the 100nm silica dispersion to 80°C, add the double bond modifier γ-methacryloxypropyl trimethoxysilane under stirring, the dosage is 20g / L, react for 6h, centrifuge at 10000rpm for 10min, wash with ethanol , and vacuum-dried to obtain nano silicon dioxide after double bond modification.
[0068] (2) Polymer brush grafted nano-silica:
[0069] Double-bond modified nano-silica is ultrasonically dispersed in deionized water at a concentration of 30g / L, and the cationic tertiary amine monomer diethylaminoethyl methacrylate is added under stirring, the mass of the cationic tertiary amine monomer and nano-silica The ratio is 1:0.5. Nitrogen was passed for 30 minutes to remove the air. After heating to 75°C, 1.0% cationic monomer mass of water-soluble initiator potassium persulfate was added, and the reaction was carr...
Embodiment 3
[0075] (1) Nano silica double bond modification:
[0076] Referring to the method in Example 1, a silicon dioxide dispersion was prepared.
[0077] Heat the 100nm silica dispersion to 60°C, add the double bond modifier methacryloxypropyl triethoxysilane under stirring, the dosage is 10g / L, react for 8h, centrifuge at 10000rpm for 10min, wash with ethanol, vacuum After drying, the nano silicon dioxide modified by the double bond can be obtained.
[0078] (2) Polymer brush grafted nano-silica:
[0079] The double-bond modified nano-silica is ultrasonically dispersed in deionized water at a concentration of 20g / L, and the cationic tertiary amine monomer dimethylaminoethyl acrylate is added under stirring. The mass ratio of the cationic tertiary amine monomer to nano-silica is 1:0.6. Nitrogen was passed for 30 minutes to remove the air. After heating to 75°C, 1.5% cationic monomer mass of water-soluble initiator ammonium persulfate was added, and the reaction was carried out at...
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