Synthesis and Characterization of Nano-TiO<sub>2</sub>/SiO<sub>2</sub>-Acrylic Composite Resin

Du, Bin; Chen, Feng; Luo, Rubai; Zhou, Shisheng; Wu, Zhengneng

doi:https://doi.org/10.1155/2019/6318623

Advances in Materials Science and Engineering

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Abstract Introduction Experimental Results and Discussion Conclusions Data Availability Conflicts of Interest Acknowledgments References Copyright Related Articles

Research Article | Open Access

Volume 2019 | Article ID 6318623 | https://doi.org/10.1155/2019/6318623

Synthesis and Characterization of Nano-TiO₂/SiO₂-Acrylic Composite Resin

Bin Du,^1,2Feng Chen,¹Rubai Luo,^1,2Shisheng Zhou,^1,2and Zhengneng Wu¹

Academic Editor: Luigi Nicolais

Received03 Aug 2018

Revised06 Nov 2018

Accepted13 Dec 2018

Published03 Jan 2019

Abstract

Waterborne acrylic resin is widely used as a binder of waterborne printing ink because of its excellent comprehensive properties. However, its further developments and applications are hindered by its poor UV resistance and water resistance. Therefore, an approach to prepare acrylic resin with excellent UV resistance and water resistance is described in this present study. The nano-TiO₂/SiO₂ composite particles were first modified with a silane coupling agent (KH-570) and a titanate coupling agent (NDZ-101) and then embedded into acrylic resin via a blending method. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and thermogravimetry analysis (TGA) were applied to investigate the structure and morphology of the modified nano-TiO₂/SiO₂ composite particles. The effects of the modified nano-TiO₂/SiO₂ composite particles on the UV and water resistance of the acrylic resin were investigated by UV spectroscopy and water resistance analysis. The weight loss of modified nano-TiO₂/SiO₂ was about 20% when heated to 600°C, which indicated that the nano-TiO₂/SiO₂ composite particles were modified by the coupling agents successfully. The UV-Vis spectra of acrylic resin showed that the UV resistance was improved upon the addition of nano-TiO₂/SiO₂. The water absorption of the nano-TiO₂/SiO₂-acrylic resin was less than 5%, indicating that the water resistance of the material was improved.

1. Introduction

Acrylic resin as a binder of waterborne printing ink has the advantages of printing adaptability and ink stability. It has been widely used in the printing industry due to its excellent properties such as good hardness, luster, acid and alkali resistance, weather and pollution resistance, and nontoxicity [1]. The relatively poor ultraviolet (UV) and water resistance of acrylic resin due to the introduction of hydrophilic carboxyl groups, however, restrain it from further developments and applications [2–5]. To achieve good UV and water resistance for acrylic resin, it is necessary and significant to prepare a modified waterborne acrylic resin [6].

There are four main popular methods that are widely applied to modify acrylic resin: monomer modification, compound modification, process modification, and nanomodification [7, 8], to be widely applied to modify acrylic resin. Since titanium dioxide (TiO₂) nanoparticles are widely used because of their good UV absorbance and photocatalytic activity, low cost, and nontoxicity as inorganic materials, the nanomodification was adopted as a more effective method to improve the UV and water resistance of the acrylic resin. The composite particles formed by coating silica (SiO₂) nanoparticles on the surface of nano-TiO₂ particles may obtain excellent UV absorption properties. In addition, the photocatalytic activity of the nano-TiO₂ particles can be reduced, allowing the wide use of nanoparticles. The nano-TiO₂/SiO₂ composite particles, combined with low surface energy materials, may be incorporated into the acrylic resin to enhance UV resistance and hydrophobic properties, simultaneously. Thus, nano-TiO₂ particles have been widely introduced into polymers to improve the heat resistance, UV resistance, and photocatalytic performance of polymer materials in the past several years [9–11]. Duan et al. [12] presented a novel approach to synthesize acrylic resin used as a binder of waterborne printing ink on plastic film with excellent adhesion and water resistance. Liu et al. [13] suggested a two-step esterification process to prepare epoxy-acrylic-graft-copolymer waterborne resins used in anticorrosion coatings on metal substrates. Zhang et al. [14] studied the properties of acrylic emulsion with 2-acrylamido-2-methylpropane sulfonic acid (AMPS) as a reactive comonomer and methyl methacrylate (MMA), n-butyl acrylate (BA), and 2-hydroxyethyl acrylate (HEA) as a copolymerization system. Viornery et al. [15] used phosphoric acid to modify the surface of nano-TiO₂. Cheng et al. [16] synthesized acrylic resin with high gloss and strong water resistance by introducing nonionic groups.

In this study, a new, low cost, and easily industrialized technique was used to modify the UV and water resistance of acrylic resin. The nano-TiO₂/SiO₂ composite particles were first modified by γ-methacryloxypropyltrimethoxysilane (KH-570) and isopropyl dioleic acyloxy (dioctylphosphate) titanate (NDZ-101) [17, 18]. Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA) were applied to study the morphology of the modified nano-TiO₂/SiO₂ composite particles. In fact, the method of using these two coupling agents to reduce the problem of easy agglomeration of nanomaterials in resins and improve their UV and water resistance has rarely been reported. A waterborne acrylic resin with excellent UV and water resistance was prepared by introducing modified nano-TiO₂/SiO₂ composite particles. We further investigated the effects of the modified nano-TiO₂/SiO₂ composite particles on the UV and water resistance of the acrylic resin. The experimental data in this paper show that the UV and water resistance of the acrylic resin were all improved with this method. In this way, the ink coating can simultaneously obtain anti-ultraviolet and superhydrophobic properties and can be applied not only to areas such as umbrellas, sun protection clothes, waterproof packaging bags, food and medicine packaging materials, but also to aviation, the aerospace industry, medical treatment, and military fields. This work has the potential to expand the application fields of resin nanomaterials and has broad application prospects.

2. Experimental

2.1. Materials

Nano-TiO₂/SiO₂ composite particles were fabricated by our laboratory. Butanol was purchased from Shanpu Chemical Co., Ltd., Shanghai, China. Benzoyl peroxide (BPO) and 95% ethanol were obtained from Kemiou Chemical Reagent Co., Ltd., Tianjin, China. Ammonia and absolute ethanol were bought from Tianli Chemical Reagent Co., Ltd., Tianjin, China. Methyl methacrylate (MMA), butyl acrylate (BA), acrylic acid (AA), KH-570, NDZ-101, and glacial acetic acid were all purchased from Ivkeyan Chemical Reagent Co., Ltd., Shanghai, China. All of the purchased reagents were used without further purification.

2.2. Preparation of Modified Nano-TiO₂/SiO₂ Composite Particles

KH-570 (98%, 2wt.%) was added to 95% ethanol, with glacial acetic acid added dropwise into the solution under magnetic stirring to adjust the pH value to 3‐4. The mixture was stirred for 30 min (Scheme 1). Briefly, NDZ-101 (reagent grade, 98%, 3 wt.%) was added to absolute ethanol and distilled water (Scheme 2) [19]. The nano-TiO₂/SiO₂ powder was dissolved in 95% ethanol via an ultrasonic process for 20 min. The above KH-570 and NDZ-101 were added to this solution in a constant temperature water bath at 65°C. The reaction was carried out under ultrasonic dispersion for 1 h. After the reaction, the samples were washed by centrifugation, dried, and ground to obtain the modified nano-TiO₂/SiO₂ composite particles.

2.3. Synthesis of Acrylic Resin

The acrylic resin was prepared by solution polymerization of MMA (99%), BA (99%), and AA (98%, 12.5 wt.%) as monomers and BPO (98%) as initiator. The ratios of the soft monomer to hard monomer and the solvent to monomers were all 1 : 1. A half of butanol (99.5%), a third of monomers, and a quarter of initiator were added to a dropping funnel (250 ml) equipped with a stirrer and a thermometer. The mixture was stirred at 100°C for 30 min. Then, the mixture of remaining monomers, initiator, and butanol was added dropwise into the dropping funnel within 2 h. The polymerization was carried out for another 3 h. Subsequently, the dropping funnel was naturally cooled down to 35°C, and ammonia (25%) was added under stirring to adjust the pH value to 8‐9. After 0.5 h, the obtained product was waterborne acrylic resin.

2.4. Preparation of Nano-TiO₂/SiO₂-Acrylic Composite Resin

The basic preparation procedure is shown in Scheme 3. The nano-TiO₂/SiO₂-acrylic composite resin was prepared via a blending method. The modified nano-TiO₂/SiO₂ composite particles at mass ratios of 1%, 5%, and 10% were added into the acrylic resin solution. The reaction was carried out under ultrasonic dispersion for 30 min. Finally, the product was placed on a glass dish and dried at room temperature for several hours.

2.5. Characterization

The surface morphologies of the modified nano-TiO₂/SiO₂ composite particles were observed by SEM (SU-8010, Hitachi, Japan). FT-IR was used to characterize various functional groups of the composite particles using KBr tablets for samples. TGA (Q600SDT, TA Instruments, USA) was performed on the nano-TiO₂/SiO₂ composite particles before and after modification under nitrogen gas with a heating rate of 10°C/min to determine their thermal stability. In the TGA experiment, the scanned temperature ranged from ambient temperature to 600°C. The acrylic resins with nano-TiO₂/SiO₂ composite particles before and after modification at mass ratios of 1%, 5%, and 10% were cut into 2 cm × 2 cm × 2 mm dimensions after being allowed to stand for 7 days. Absorbance was obtained by a UV spectrophotometer at 200–800 nm. The absorbance of acrylic resin both with and without nano-TiO₂/SiO₂ composite particles at 200–800 nm was measured and compared. The cut films were washed by distilled water and placed on a glass dish. After being dried in an oven under 50°C for 1 h, the films were cooled down to room temperature and weighed (M_W1). Then, the coating films were soaked in distilled water for 24 h. The weights of both applied films and adsorbed water (M_W2) were used to calculate the water absorption by the following formula:where is the weight of the applied films cooled to room temperature and is the weight of the coating films soaked in distilled water for 24 h.

3. Results and Discussion

3.1. Morphological Analysis

As seen in Figures 1(b), 1(d), and 1(f), the nano-TiO₂/SiO₂ composites without modification were completely precipitated in acetone [20, 21]

In comparison, the modified nano-TiO₂/SiO₂ composite particles were preferably dispersed in acetone as shown in Figures 1(a), 1(c), and 1(e), which exhibit good lipophilicity. As can be seen from the figures of modified nano-TiO₂/SiO₂ composite particles, the dispersion effect of Sample 3 was inferior to that of Samples 1 and 2.

3.2. SEM Analysis

The surface morphologies of the modified nano-TiO₂/SiO₂ composite particles were observed by SEM. As a reference, the SEM images of nano-TiO₂/SiO₂ composite particles without the modification of coupling agents are marked as “none” in Figures 2(a) and 2(e). It can be seen that the agglomeration of nano-TiO₂ particles is of considerable amounts. There were many free nano-SiO₂ particles that could not be formed and coated well on the surface of the nano-TiO₂ particles.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

As shown in Figures 2(b)–2(d), the surface of the nano-TiO₂/SiO₂ particles is covered with a rounded organic layer. It can be seen clearly in Figures 2(f)–2(h) that the organic coating is dense, while the coating effect is quiet clear under a magnification of 130,000. There is still a little agglomeration in the modified nano-TiO₂/SiO₂ composite particles, which may be due to the insufficient grinding of the composite particles or the poor dispersion effect of the powder in the preliminary experiment [22, 23]. The SEM images of modified nano-TiO₂/SiO₂ particles combined with the figures of nano-TiO₂/SiO₂ composite particles before and after modification in acetone indicate that the coating effect of Sample 1 and Sample 2 is better than that of Sample 3.

3.3. FT-IR Analysis

The FT-IR spectra of the nano-TiO₂/SiO₂ composite particles before and after modification are shown in Figure 3. The peak at 3500 cm⁻¹ in Figures 3(a)–3(c) is the bending vibration peak of –OH in the absorbed water of nano-TiO₂ particles, while abroad absorption band at 3460 cm⁻¹ in Figures 3(d)–3(f) may be attributed to an –OH group of absorbed water in the nano-TiO₂/SiO₂ particles. The stretching vibration of C=O in KH-570 is also observed at 1650 cm⁻¹, while the absorption peak at 1880 cm⁻¹ can be attributed to C=O groups in NDZ-101 [24, 25]. The asymmetric stretching vibration of Si–O–Si near 1080 cm⁻¹ can be attributed to a change in the chemical state, which is ascribed to the chemical reaction of KH-570 with nano-SiO₂ particles. At the same time, the spectrum clearly illustrates the absorption peak of Si–O–Ti at 975 cm⁻¹ due to the chemical reaction of NDZ-101 with nano-SiO₂ particles on the nano-TiO₂ [22]. These results indicate the presence of KH-570 and NDZ-201 on the surface of the nanoparticles, and the coupling agents are grafted onto the surface of the nanoparticles through chemical changes rather than a simple physical coating.

3.4. TG Analysis

Figure 4 shows the TGA curves of nano-TiO₂/SiO₂ composite particles both before and after modification with the coupling agents (KH-570 and NDZ-101). All the samples were dried in a vacuum oven for 24 h before being tested. The small mass loss observed for nano-TiO₂/SiO₂ composite particles between 0°C and 200°C is probably due to the evaporation of water vapor adsorbed on the surface of the samples at high temperatures. The temperature at which 20% mass loss occurs is about 600°C for modified nano-TiO₂/SiO₂ composite particles. The appearance of the Tg indicates that nano-TiO₂/SiO₂ composite particles have been modified by coupling agents successfully. A sharp transition occurs at about 450°C corresponding to the thermal decomposition of the coupling agents, while the weight loss in the temperature range of 500°C–600°C is due to the thermal decomposition of grafted coupling agents at high temperatures [26].

3.5. UV Resistance Properties Analysis

The UV resistance characteristic of nano-TiO₂/SiO₂-acrylic composite resin was investigated by UV-Vis absorption spectra shown in Figure 5. The UV resistance characteristic is only discussed in the UVA band (320–400 nm) and the UVB band (280–320 nm) [27]. Figure 5 shows the UV-Vis spectra of acrylic resin before and after adding modified nano-TiO₂/SiO₂ composite particles. The absorbance of acrylic resin without nano-TiO₂/SiO₂ composite particles is always lower than 2 in the wavelength range of 200–800 nm, while the absorbance of nano-TiO₂/SiO₂-acrylic composite resin reaches about 4 in the wavelength range of 200–320 nm. There is a high absorption at 280–320 nm, that is, a low transmittance. The same phenomenon occurs at 320–400 nm. The enhancement of UV resistance can be ascribed to the production of electron-hole pairs caused by the nano-TiO₂ particles being irradiated by the light whose energy greater than the forbidden bandwidth [28, 29].

The effects of the content of modified nano-TiO₂/SiO₂ composite particles on the UV resistance of modified acrylic resin are shown Figure 6. It can be seen that the UV absorbance improves as the content of nano-TiO₂/SiO₂ composite particles increases. As the content of nano-TiO₂/SiO₂ composite particles increases from 1% to 10%, the UV wavelengths were completely shielded by the composite acrylic coating when the range was from 310 nm to 350 nm, while the transparency was still maintained above 90%. The UV transmittance of the composite particles is below 30% when the mass ratio of nano-TiO₂/SiO₂ composite particles is 10%. The result indicates that the UV resistance and transparency of modified acrylic resin are all improved and the effect of nano-TiO₂/SiO₂-acrylic composite resin with 10% nano-TiO₂/SiO₂ composite particles is better than the others.

3.6. Effects of Modified Nanocomposite Particles Ratio on Water Resistance

The water resistance of acrylic resin is its capacity to absorb water. It is a property that mainly depends on the ratio of hydrophilic/hydrophobic functional groups and on the nature of these groups as well [30]. As waterborne acrylic resin contains a lot of hydrophilic carboxyl groups, they generally have an ability to absorb considerable amounts of water. Thus, water-resistant modifications must be applied to the surface of the nanoparticles. The effects of altering the modified nanocomposite particles ratio (1%, 5%, and 10%) on water resistance of acrylic resin were investigated. As a reference, a pure acrylic resin was prepared. The test values of water absorption are listed in Table 1. It was determined that the water absorption decreases when the mass ratio changes from 1% to 5%. The result may be due to the formation of micro- and nanoconvex structures on the surface of the acrylic resin coating caused by the addition of nano-TiO₂/SiO₂ composite particles and the hydrophobic treatment by coupling agents. However, the water absorption increases when the ratio changes from 5% to 10%. The reason is the agglomeration of excess SiO₂ molecules due to interactions between hydroxyl hydrogen bonds, which results in a reduction in the length of the movable segment unit and a weakening of the bonding force between the material and the substrate so that the water resistance is reduced. As shown in Table 1, the water absorption of the acrylic resin with modified nano-TiO₂/SiO₂ particles is less than 5% for all three contents, indicating that the water resistance of composite acrylic resins is improved compared with pure acrylic resin [31].

4. Conclusions

A novel preparation method was developed to prepare nano-TiO₂/SiO₂-acrylic composite resin with excellent UV and water resistance. The main purpose of this study is to investigate the methodology of improving the properties of acrylic resin as a binder of waterborne printing ink. Through TGA curves, it can be shown that the nano-TiO₂/SiO₂ composite particles were modified by the coupling agents successfully. FT-IR confirms that KH-570 and NDZ-101 were grafted on the surface of nanocomposite particles in a bonding form. According to UV-Vis absorption spectra, it was observed that, after introducing modified nano-TiO₂/SiO₂ composite particles into acrylic resin, the UV resistance and transparency of modified acrylic resin were all improved. The water absorption of the nano-TiO₂/SiO₂-acrylic resin, which was less than 5%, indicates that the water resistance of these materials is enhanced by the modified nano-TiO₂/SiO₂ composite particles. In summary, the results show that the UV and water resistance of acrylic resin modified with nano-TiO₂/SiO₂ composite particles by a blending method are improved. The experiment data indicate that the nano-TiO₂/SiO₂-acrylic composite resin synthesized in this study can be hopeful candidates for environmentally waterborne printing ink to be used in printing and related industries.

Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this paper.

Acknowledgments

This work was supported in part by NSF of the Science and Technology Department of Shaanxi Province under Grant nos. 2016JM5068 and 2018JQ5100, NSF of the Key Laboratory of Shaanxi Provincial Department of Education under Grant no. 15JS075, and Shaanxi Collaborative Innovation Center of Green Intelligent Printing and Packaging.

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Copyright © 2019 Bin Du et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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