High performance nanocomposite latex
A technology for compounding surfactants and colloids, applied in the field of nanocomposite membranes
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example 1
[0035] SiO via coupling agent 2 Nanoparticles for Modification
[0036] GPTMS was pre-hydrolyzed in aqueous solution for 3 h to prepare a 60 wt% GPTMS solution, which was then mixed with SiO at ambient temperature under vigorous mechanical stirring. 2 The sol was mixed for 0.5 h, followed by another 24 h reaction at 70 °C to obtain GPTMS-modified SiO 2 , whose zeta potential is -39mV, which is almost the same as that of the unmodified one. GPTMS and SiO 2 A typical weight ratio of nanoparticles is 1:10.
example 2
[0038] SiO 2 / Synthesis of Acrylic Copolymer Nanocomposite Latex
[0039] SiO was synthesized by emulsion polymerization as follows 2 / P(MMA-BA) nanocomposite latex: at a vigorous stirring rate of 1,500 rpm, a mixture of BA (8 g), MMA (7.5 g), HEMA (2.0 g) and MAA (0.5 g) was added to the SDS solution ( 0.24gSDS dissolved in 5g H 2 O), and pre-emulsified for 0.5 hours. Under machine stirring, the following typical synthesis formula was charged into the four-necked flask: 64g GPTMS modified SiO 2 Sol (SiO 2 The mass of nanoparticles is 24g), CO-977 (0.48g), AIBA (0.16g) and H 2 O (14.12 g) and heated to 70 °C under nitrogen atmosphere. Then, 21.24 g of pre-emulsion was added dropwise to the mixture over 2 hours, and polymerization was allowed to proceed for 8 hours. pure Acrylic Copolymer Latex is by the same method but using water instead of SiO 2 Nanoparticle sols were prepared.
example 3
[0041] Preparation of nanocomposite latex films
[0042] SiO was fabricated by pouring the resulting latex onto a clean glass dish and allowing the water to evaporate 2 / poly Acrylate nanocomposite film. SiO in the nanocomposite films thus obtained 2 The content varies between 25 and 60 wt%. Pure polyacrylate films were prepared by the same method. For comparison, a conventional physical mixing method was used to replace the above-mentioned emulsion polymerization method to produce a compound containing 25wt% SiO 2 nanocomposite membranes.
[0043] Examples 1 to 8 listed in Table 1 below and Comparative Examples 1 to 7 listed in Table 2 below were prepared according to the methods exemplified in the above process examples. It can be found that the nanocomposite latex prepared by the method of the present invention has better dispersibility, and has higher SiO 2 In the case of content, the obtained film still has considerable transparency and uniformity.
[0044] ...
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