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Aolic acid resins are polymerized with polyols and polyic acids, and the main chain contains a large amount of ester base. Aliclicic resins can be synthesized from vegetable oil as the main raw material, or by renewable resources as the main raw material. Among them, vegetable oil includes soybean oil, flax oil, seed oil, oil and so on. Renewable resources include trench oil, the production of edible vegetable oil, such as the lower part of the material. NanoTiO2 has a good function of absorbing ultraviolet light, but also reflects and scatters ultraviolet light. Adding a small amount of nanoTiO2 particles can significantly improve the performance of the
coating
, but because the nanoparticles are larger than the surface area, easy to reunite, directly added to the coating, uneven dispersion, so it should be modified. How to prevent nanoTiO2 reunion is the primary problem to be solved. Aolic acid resin-based coating contains hydroxyl and carboxyl, so the paint film has better adhesion. However, the raw materials of synthetic aliclicic acid resin are different, the process is different, its relative molecular quality is also different, the paint film performance of aolic acid resin also has an impact. In this paper, the nanoTiO2 is modified with the silane coupled agent KH-570, and then the alkyd resin from three different sources is prepared into a coating to improve the performance of the alkyd resin-based coating.
1. Test part
1.1 Raw materials
commercially available aolic acid resin (1) (Shuanghu
Coatings Company
), eucalyptus oil, glyceroid, LiOH, shoals, phthalates, legumes, gluten, Shunyu, benzoic acid, 200 solvent gasoline, Aladdin reagents, sharp titanium-type nanoTiO2 (5 to 10nm), silane coupled agent KH-570 (Hubei Wuda Silicone New Materials Co., Ltd.), deionized water, ordol, sulfate, sodium hydroxide.
1.2 instruments and
using Fourier infrared spectrometer (FTIR) to visually correct the structural changes of nanoTiO2 before and after. The dispersion effect of nanoTiO2 particles in aolic acid resin before and after transmission mirror (TEM) sterile correction was used, and the adhesion, impact resistance, flexibility, hardness, wear resistance and acid resistance test were carried out on the coating film of alicic acid resin.
1.3 Test process
1.3.1 oil preparation alicic acid resin (2 s)
50.0g steroid oil, 10.0g glycelycero, 0.05gLiOH in a four-mouth bottle, At 230 degrees C alcohol solution 30min, cool down to 180 degrees C, access to the water dispifier, add 19.0g phthalates, 0.05g diazole, react at 190 degrees C 2h, cool down, with 200 s gasoline thinning.
1.3.2 Soybean oil lower-foot preparation aolic acid resin (3 s)
said to take 26.0g soybean oil fatty acids, 9.0g glycerol, 2.0g glycelycerin in a four-mouth bottle, heated, heated to 180 to 180 190 degrees C insulation 1h, access to the water substation, add 13.0g phthalates, 0.3g shunned, 1.9g benzoic acid, water heating up to 240 degrees C, insulation 5h, cooling, with 200 .
1.3.3 nanometer TiO2 modified
1g nano TiO2 (sharp titanium type 5 to 10nm), moderate amount of butanol into four bottles, ultrasound mixed 30min, Add the silane coupled agent KH-570 with nanoTiO2 content of 10%, a small amount of deionized water, stirring reaction 2h under alkaline conditions around 85 degrees C, and drying 24h at 80 degrees C after centrifugal separation.
1.3.4 Modified NanoTiO2 Test
performed infrared spectroscopy on modified nanoTiO2 to analyze the adhesion of the modified nanoTiO2 surface to the silane coupled agent KH-570.
1.3.5 coating film preparation
with 3 kinds of alicyl acid resin as the base material, added a total of 0.5%, 1.0%, 3.0% of the modified nanoTiO2, ultrasonic co-dispersion 1h, prepared with 3 different proportions of modified nanoTiO2 particles of aolic acid resin-based coating. According to GB1727-1979, the composite resin brush is applied to the iron plate of the horse mouth, ready for testing.
1.3.6 coating test
the coating film on the iron plate of the horse mouth is based on GB1720-1989, GB1732-1993, GB1731-1993 GB6739-1986, GB1768-1989, GB9274-1988 detect coating adhesion, impact resistance, flexibility, hardness, wear resistance, acid resistance.
2 results and discussion
2.1 Two kinds of homemade aliclicide resin infrared analysis
two kinds of homemade aliclicide resin infrared analysis see Figure 1, Figure 2.
Figure 1 Infrared spectrogram of alfalic acid resin
Figure 2 Infrared spectrogram of soy oil in the lower foot of soybean oil
As can be seen from Figure 1, there are obvious absorption peaks in 1600 to 1580cm-1, indicating that benzene rings are connected to the molecule, 3437cm There are hydroxyl characteristic absorption peaks near -1, 2927cm-1 is methyl absorption peak, 1734cm-1 is the telescopic vibration absorption peak in the polymer, 1286cm-1 is the vibration absorption peak of carbon-oxygen bonds, indicating the synthesis of aolic acid resin with oil.
As can be seen from Figure 2, 3437cm-1 is the hydroxyl characteristic absorption peak, 2937cm-1 is the methyl, medehye characteristic absorption peak (weaker), 1730cm-1 is the telescopic absorption vibration peak in the polymer, 1243cm-1 is the retractable vibration absorption peak of the carbon-oxygen bond, indicating that the acid resin is synthesized with the lower foot of soybean oil.
2.2 KH-570, Nano TiO2, modified NanoTiO2 infrared spectroscopy
KH-570, NanoTiO2, modified NanoTiO2 infrared test spectra are shown in Figure 3.
3 KH-570 modified before and after nanoTI02 infrared spectral map
from Figure 3 analysis, (a) 2840cm-1 and 2944cm-1 absorption peak corresponding to C-H key telescopic vibration peak, (b) also in 2840cm-1 and 2944cm-1 there is a corresponding C-H key telescopic vibration peak, (c) 3430cm-1 absorption peak corresponding to nanoTiO2 hydroxyl telescopic vibration peak, (b) can also be found in 3438cm-1 hydroxyl telescopic peak vibration, but the absorption peak significantly decreased, indicating that the number of modified nanoTiO2 hydroxyl has decreased. At the same time, the Si-O-C key in KH-570 has two strong absorption peaks at wave numbers 1088cm-1 and 1166cm-1, while (b) there are absorption peaks at 1176cm-1, indicating that the modified nanoTiO2 surface has Si-O-C key. The above results show that KH-570 has made organic changes to nanoTiO2.
2.3 modified nanoTiO2 subsidon test analysis
before and after the modified nanoTiO2 subsidon effect in water is compared to Figure 4.
Figure 4 before and after the modified nanoTiO2 in the water subsidion effect comparison
From Figure 4, it can be seen that the nanoTiO2 particles suspended in the water is milky white, there is obvious hydrophobic, and the modified nanoTiO2 only a small amount of suspension in the water, most concentrated in the upper layer, not in contact with water, hydrophobic obvious. This is due to the nanoTiO2 surface contains a large number of hydroxyl groups, has a strong hydrophobic, and by KH-570 modified, the surface is connected with organic groups, so that the modified nanoTiO2 hydrophobic.
2.4 transmission mirror analysis
transmission mirror analysis as shown in Figure 5.
figure 5 before and after the change nanoTIO2 dispersion in alicyl resin
from Figure 5, it can be seen that (b) the transparency of the figure is significantly better than (a) figure, (a) the figure has a larger amount of nanoTiO2 reunion, and (b) the graph modified nanoTiO2 almost no reunion. This is due to the KH-570 modified nanoTiO2 surface has organic groups, with a strong affinity with alicic acid resin, can be evenly dispersed in aolic acid resin.
2.5 coating acid resistance test analysis
the coating film after 10% sulphuric acid immersion over time corrosion is compared to Table 1.
1 paint film acid resistance test analysis
by Table 1 can be known, added modified nano TiO2 aliclicide resin is stronger than the acid resistance of antholate varnish. This is due to the modified nanoTiO2 surface containing KH-570 organic group and organic alcoholic acid resin compatible is better, can be evenly dispersed in the aliclicylic resin, the formation of aolic acid resin-based coating surface is denser, enhance the resistance to acidic media, so that the acid resistance of aolic acid resin-based coating film enhanced.
2.6 Coating mechanical performance test analysis
aolic acid resin modified nanoTiO2 addition ratio, impact resistance, flexibility, hardness, adhesion see Table 2.
2 paint film mechanical performance test analysis
by Table 2, the addition of modified TiO2 nanoparticles can improve the adhesion and hardness of the coating film to a certain extent. This is due to the addition of modified nanoTiO2 particles, improve the denseness of the coating film, so that the adhesion of the coating film, hardness have a certain degree of improvement.
2.7 paint film wear resistance test analysis
different proportions of modified nanoTiO2 particles alicic resin coating film (thickness 60 m) wear resistance can be seen in Table 3.Table
3 Paint film wear resistance test analysis
by Table 3, the addition of 3.0% modified nanoTiO2 aliclicyl resin-based coating wear resistance is optimal, because with the increase in the amount of modified nanoTiO2, modified nano-TiO2 nano-size effect appears.
3. Conclusion
1) using KH-570 modified nanoTiO2, so that it has a good dispersion effect in the alicic acid resin, with the use of oil, soybean oil under the foot material made of aolic acid resin composite, can form a good combination with the modified nanoTiO2 particles of aolic acid resin coating.
2) with 0.5%, 1.0%, 3.0% ratio of modified nanoTiO2, and mineral-type, oil synthesis, soybean oil foot synthetic alicic acid resin prepared paint, its acid resistance, wear resistance, mechanical properties have been improved.
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