Preparation method of modified nano-silica monomer dispersion liquid
A technology of nano-silica and dispersion liquid, which is applied in the treatment of dyed organic silicon compounds and fibrous fillers. Wetting and dispersion stability, avoiding the possibility of agglomeration, and strong operability
Inactive Publication Date: 2011-12-21
杭州鑫至投资管理有限公司
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Problems solved by technology
However, the above-mentioned nano-silica itself still has strong hydrophilicity and self-aggregation, so in the process of heating and drying to obtain silica powder for the preparation of monomer dispersion, it is very easy to produce large amounts of water with the volatilization of the medium. The tight combination and serious agglomeration of the scale, and these agglomerates are difficult to be completely deagglomerated even through strong dispersion methods such as ultrasonic dispersion or high-speed shearing, so a large number of monomers are often observed in the final monomer dispersion. Silica Large Particle Aggregates
Therefore, so far, there have been no reports of nano-silica monomer dispersions that can be highly uniformly dispersed in the form of primary particles in the monomer medium and can be stored stably for a long time.
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[0030] According to the feeding amount shown in Table 1, after mixing the nano silicon dioxide ethanol dispersion liquid and the silane coupling agent, under the state of magnetic stirring, carry out coupling modification to the nano silicon dioxide therein at the temperature shown in Table 1, The modification time is shown in Table 1. Then add the monomers described in Table 1 to the above-mentioned modified dispersion, mix them uniformly and put them into the RE52CS-1 rotary evaporator (the speed is 15 revolutions per minute), under the conditions of temperature and absolute pressure shown in Table 1 Carry out rotary evaporation under reduced pressure (always keep the monomer under the condition of existing, and supplement the monomer as needed), until no gas can be condensed and collected. According to requirements, finally add an appropriate amount of monomer to the concentrated solution to prepare a modified nano-silica monomer dispersion, and the total mass of the modifi...
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Abstract
The invention discloses a preparation method of modified nano-silica monomer dispersion liquid, comprising the following steps of: firstly, adding silane coupling agent into nano-silica alcohol dispersion liquid, and obtaining corresponding modified nano-silica alcohol dispersion liquid by carrying out coupling modification for 6-24h in a stirring state at the temperature of 25-40 DEG C; secondly, adding a monomer into the modified nano-silica alcohol dispersion liquid, uniformly mixing, and removing alcohol under the condition of the temperature lower than 600 DEG C and absolute pressure lower than 0.10MPa in the presence of the monomer to obtain the modified nano-silica monomer dispersion liquid, wherein the mass proportion of modified nano-silica in the monomer dispersion liquid is 10-30 percent. The preparation method has the advantages of simple technological process, mild process conditions and high production efficiency and is suitable for industrial production. The prepared modified nano-silica monomer dispersion liquid can be applied to preparation of high dispersity composite materials and composite microspheres with a special morphological structure.
Description
technical field [0001] The invention relates to the field of preparation of inorganic particle dispersion liquid, in particular to a preparation method of modified nano silicon dioxide monomer dispersion liquid characterized by high dispersibility and high inorganic content. Background technique [0002] As a typical inorganic nanoparticle, nano-silica (SiO 2 ) has been widely used in rubber, plastics, coatings, paints, electronics, medicine, biology, ceramics, textiles, cosmetics and many other industries. However, due to its extremely fine particles, high surface atomic ratio, large specific surface area, unsaturated residual bonds on the surface, and high content of hydroxyl groups in different bonding states, the surface coordination is seriously insufficient, and many active centers appear. Therefore, nano-silica particles tend to attract each other through van der Waals force, hydrogen bond and some covalent bonds, and then large-scale agglomeration and adhesion are v...
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IPC IPC(8): C08F292/00C09C1/28C09C3/12
Inventor 戚栋明袁艳张睿申兴丛吴明华
Owner 杭州鑫至投资管理有限公司