Slow-fragrance type high-strength nano-composite colored pencil lead and preparation method thereof
A nano-composite, high-strength technology, applied in pencil lead, household utensils, applications, etc., can solve the problems of insufficient flexural strength and poor writing lubricity, so as to improve writing lubricity, performance, flexural strength and The effect of toughness
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[0038] The present invention provides a slow fragrance type, high-strength nano-composite colored lead core and a preparation method thereof, comprising the following steps:
[0039] 1) The hollow nanoparticles are first activated with a dilute hydrochloric acid solution with a mass concentration of 5% to 20% for 0.5 to 12 hours, then directly added to the solution system containing essence, and then subjected to high temperature and high pressure treatment at 100 to 160°C for 0.5 to 6 hours , filtered and dried to obtain slow fragrance microcapsules. Wherein, the mass-number ratio of hollow nanoparticles: essence: solvent is 1-10:5-100:50-5000;
[0040]Among them, the hollow nano-particles can be hollow silicon dioxide, hollow zinc oxide, hollow titanium dioxide, hollow iron ferric oxide or hollow tin oxide, or a compound of two or more; the flavor can be apple flavor, almond essence, peach essence, grape essence, cherry essence, strawberry essence, apricot essence, coconut ...
Embodiment 1
[0055] 1) After activating 5 parts of hollow nano-silica with 40 parts of dilute hydrochloric acid solution with a concentration of 15%, directly add it to 2000 parts of aqueous solution containing 75 parts of apple essence, and then carry out high-temperature and high-pressure treatment at 130° C. for 4 hours, Suction-filtered and dried to obtain slow-apple-scented-slow-scent microcapsules;
[0056] 2) First, weigh 10 parts of paraffin wax, 10 parts of hydroxypropyl methylcellulose, 65 parts of kaolin, 12 parts of red pigment and 12 parts of slow fragrance microcapsules and carry out high-speed stirring and blending for 1 hour to make the materials evenly mixed. Secondly, after raising the temperature to 130°C, continue high-speed stirring for 1 hour to melt the paraffin wax and hydroxypropyl methylcellulose and infiltrate other fillers to form lumps. Next, the mixed material is extruded on an extruder to obtain a colored lead core with a diameter of 0.5 mm. Finally, put the...
Embodiment 2
[0060] 1) 1 part of hollow nano-zinc oxide was first activated with 40 parts of 5% dilute hydrochloric acid solution for 0.5h, and then directly added to 50 parts of ethyl acetate solution containing 5 parts of cherry essence, and then subjected to high temperature at 100 ° C. High-pressure treatment for 0.5h, suction filtration and drying to obtain slow cherry-flavored microcapsules.
[0061] 2) First, weigh 5 parts of beeswax, 15 parts of polyethylene glycol, 50 parts of mica powder, 10 parts of yellow pigment and 5 parts of fragrance-sustaining microcapsules and carry out high-speed stirring and blending for 0.5 hours to make the materials evenly mixed. Next, after raising the temperature to 130°C, continue high-speed stirring for 0.1 hour to melt the beeswax and polyvinyl alcohol and infiltrate other fillers to form lumps. Next, the mixture was extruded on an extruder to obtain a yellow lead core with a diameter of 0.7 mm. Finally, put the obtained colored lead cores into...
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