Preparation method of anti-reflective coating material composition containing silica hollow particles
A hollow particle and silica technology, which is applied in the field of coating substrates and the preparation of anti-reflection coating compositions, can solve the problems of staying, unable to obtain anti-reflection coatings, unable to effectively control particle size and morphology, etc. Operation, avoid particle agglomeration, expand the effect of application field
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Embodiment 1
[0077] Silica hollow particles are prepared by using the method of the invention. 1) Mix 208 grams of tetraethyl orthosilicate, 50 grams of ethanol, and 15 grams of polyethylene glycol (average molecular weight 750) until transparent, then add 15 grams of concentrated hydrochloric acid (37% by mass) and 10 grams of Mix the ionic water evenly, after stirring for 5 minutes, raise the temperature to 80°C and continue the reaction for 2 hours, and quickly rotate and distill off the solvent and low molecular weight compounds in the system under reduced pressure to obtain a flowable, transparent polyalkoxysiloxane with a certain viscosity alkane precursor; 2) Take 100 grams of polyalkoxysiloxane precursor and add it to 350 grams of deionized water, stir rapidly to obtain a white dispersion; 3) Add 25 grams of concentrated ammonia water (mass fraction: 25%), and continue to stir for 5 hours to obtain a translucent dispersion; 4) Centrifuge the dispersion to remove the supernatant, wa...
Embodiment 2
[0080] The difference between Example 2 and Example 1 is that 208 grams of tetraethyl orthosilicate in step 1) is replaced with 146 grams of silicon 40 commonly used in the silicone industry, and polyethylene glycol (average molecular weight 750) is replaced For polyvinyl alcohol (average molecular weight 500), reduce the amount of concentrated hydrochloric acid and deionized water to 7.5 grams and 5 grams respectively, replace the centrifugal-water washing operation in step 4) with dialysis, and the molecular weight cut-off of the selected dialysis bag is 14000 .
[0081] The transmission electron microscope photograph of gained silicon dioxide hollow particle is as follows image 3 The dynamic light scattering diagram of the dispersion is shown as Figure 4 shown. It can be seen that the size distribution of the hollow particles is uniform, the average size is 70-80 nanometers, the wall thickness is 7-8 nanometers, the spherical structure is complete, the cavity structure ...
Embodiment 3
[0083] The difference between embodiment 3 and embodiment 1 is that in step 1), 208 grams of tetraethyl orthosilicate is replaced by 152 grams of tetramethyl orthosilicate, ethanol is replaced by isopropanol, and polyethylene glycol is replaced by Polyethylene glycol monomethyl ether (average molecular weight 500), replace 15 grams of concentrated hydrochloric acid (mass fraction 37%) with 14 grams of concentrated nitric acid (mass fraction 68%), replace 350 grams of deionized water in step 2) with 300 1 g of deionized water and 50 g of ethanol as a mixed solvent, and replace 25 g of concentrated ammonia water in step 3) with 25 g of sodium hydroxide aqueous solution (0.1M).
[0084] The transmission electron microscope photograph of gained silicon dioxide hollow particle is as follows Figure 5 The dynamic light scattering diagram of the dispersion is shown as Figure 6 shown. The size distribution of the hollow particles is uniform, the average size is about 100 nanometers...
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