Research on New High-efficiency Antibacterial Powder Coating

In accordance with the requirements of antibacterial coatings in different use environments and high-efficiency antibacterial properties, starting from the mechanism of antibacterial powder coatings, the antibacterial effects of antibacterial powder coatings prepared by different antibacterial agents under different processes have been studied;

The effects of different antibacterial agents on the antibacterial effect, gloss and color difference of powder coatings under water washing resistance, boiling resistance, high temperature resistance, and ultraviolet light resistance tests were studied.

The results showed that the antibacterial effect of the antibacterial agent compounded with silver ions and zinc ions with a glass network structure is the best; the powder coating with internal extrusion and external mixing has excellent antibacterial performance; the obtained coating is treated at high temperature and washed with water.

Choose an antibacterial agent containing silver ions with a glass network structure.

Preface

With the gradual expansion of the application range of powder coatings in recent years, and the increasing requirements for the content of volatile organic compounds (VOC) in the coatings industry, the use of antibacterial powder coatings on the surfaces of various appliances and daily necessities is increasing.

For example, higher requirements are put forward for the antibacterial effect of the equipment used in hospitals and their surface coatings, and the demand for antibacterial coatings is gradually increasing.

Silver ions can absorb microorganisms in the water, so that the enzymes on which the microorganisms breathe are ineffective, thereby killing the microorganisms.

In recent years, many commercial brands of silver ion antibacterial agents have appeared, such as the silver ion antibacterial agent IONPUREIPL of Japan's Ishizuka Glass, Hangzhou Henner HN-T07P, and Dow SILVADUR of the United States.

However, it is difficult to directly apply ordinary silver ions in powder coatings, because the temperature during melt extrusion and spray baking curing of powder coatings is relatively high, up to 200°C, and the silver ions at high temperatures are easily destroyed.

This will not only cause the silver ions to be oxidized, but also make the resulting coating prone to yellowing during the baking process.
Because the silver ions are partially oxidized, the release rate of silver ions in the coating cannot be controlled, and the antibacterial durability of the coating is relatively poor.
After being washed with water for several times, the silver ions on the surface are cleaned, and the antibacterial performance is reduced.

Therefore, it is necessary to select a suitable antibacterial agent with silver ion carrier to ensure the antibacterial performance of the coating while maintaining long-term antibacterial performance under the condition of washing with detergent and washing by rain.

Generally speaking, antibacterial agents are divided into two categories: organic and inorganic.
The safety of organic antibacterial agents is still under research.
Inorganic antibacterial agents are safer and more practical for the human body.

The antibacterial mechanism of the contact reaction of the antibacterial agent is the silver ion contact reaction, which causes damage to the common components of microorganisms or dysfunction;

When a small amount of silver ions reach the microbial cell membrane, because the latter is negatively charged, relying on Coulomb's gravity, the two are firmly adsorbed.
The silver ions penetrate the cell wall and enter the cell, and react with the sulfhydryl group to solidify the protein and destroy the cell synthetase.
Active, cells lose their ability to divide and proliferate and die.

Silver ions can also destroy the microbial electronic transmission system, respiratory system and material transmission system, thereby playing a role in killing bacteria.

This study compared the effects of different addition methods and different treatment methods (water washing, boiling water treatment, high temperature treatment, light, etc.
) of antibacterial agents on the antibacterial properties of powder coatings, in order to obtain a better antibacterial effect and under various conditions of use.
High-efficiency antibacterial powder coating with excellent antibacterial properties.

1 Test part

1.
1 Test materials

Epoxy resin (two-step method, E-12): Nanya; Titanium Dioxide: Zhongnuo Titanium Dioxide; Barium Sulfate: Xinmei Chemical; Polyester Resin: DynaSky; Acrylic Polymer: Nanhai Chemical; Leveling Agent: Ace Tren/BASF; antibacterial agent: Henner/IONPUREIPL; general additives for coatings: commercially available.
The above raw materials are all industrial grade.

1.
2 Test equipment

SLJ-30AF、ACM：；500g：DFY-500C，；：QCJ，；：PHH-201，；：QNIX-4500，；：CM-3600d，；：QUV-Spray（UVB-313），Q-lab。

1.
3

1。

1，，，，180，。

（75mm×150mm），，，180℃/10min，24h，。

1.
4

1.
4.
1

。：50mL，5g，5N50，50mL，50。

1.
4.
2

100℃2h，1h。

1.
4.
3

UVB-313，24h、48h。

1.
4.
4

200℃1h，。

1.
5

2。

2

2.
1

4：1#、2#、3#、4#；

，2%，、（1.
5%，0.
5%）、3，3~5。

3，；1#97%，，；

2#、3#、4#，99%，2#，3#，，；

4#，，。

，，。

34，，1#97.
72%98.
52%，3，，。

5，2%，1#、2#、3#，，；

1#、2#、3#2；4#，。

，，，。

，2%。

2.
2

2.
2.
1

2#、3#，，6。

6，3#，2#。

3#，，，，。

2#，，。

2.
2.
2

，7。

7，2h，2#12h99.
99%95.
43%，2#，。

3#12h98.
67%，，3#，，。

2.
2.
3

，8。

8，24h，2#3#。

48h，2#95.
63%，，3#97.
52%。

2#，3#，，。

2.
2.
4

9。

9，2#3#，，3#。

3#，，，，。

，3#，1。

In the boiling water resistance test and the high temperature baking test, the antibacterial properties of the coating decreased to a certain extent, mainly because the structure of the antibacterial agent may be affected at high temperature, and at the same time, some antibacterial agents are oxidized, but different antibacterial agents are affected.
The impact is inconsistent.

Antibacterial agent 1# and 2# (products that cannot be used in direct contact with the human body) can meet the antibacterial performance under ordinary conditions of use, while the performance of antibacterial agent 3# is relatively excellent, suitable for use in environments with high temperatures and frequent washing.
.

2.
3 The influence of the amount of antibacterial agent on the antibacterial performance of the coating

The test selected antibacterial agent 3# to investigate the influence of its different dosages on the antibacterial performance of the powder coating.
The results are shown in Table 10.

It can be seen from Table 10 that with the increase in the amount of internal antibacterial agent, the antibacterial property of the 12h coating is basically above 99.
99%.
The yellowing resistance of the coating is getting worse and worse, and the color difference value changes from 0.
2 to 0.
5.

With the increase in the amount of antibacterial agent, the antibacterial effect of the coating for 6 hours has gradually increased, and the antibacterial effect has increased from 96.
72% to 99.
99%.

When the amount of antibacterial agent is 5%, the surface of the coating will have a foggy effect, the surface will lose gloss slightly, and the appearance of the coating will be poor.
It means that adding too much high-efficiency antibacterial agent will affect the gloss of the coating, and the yellowing resistance of the coating will be affected.
Decline.

When the amount of antibacterial agent is 2%~3%, the antibacterial effect of the coating is the best, and the overall performance is the best.
Select 2% antibacterial agent 3# and add it to the powder coating to test the performance of the coating.
The results are shown in Table 11 and Table 12.

Combining the results in Table 11 and Table 12, it can be seen that the coating performance and antibacterial performance of the antibacterial powder coating prepared in this study can meet the requirements of daily use under different environmental impacts.

3 Conclusion

In the process of selecting the antibacterial agent of the antibacterial powder coating, it was found that the antibacterial properties of the coating after the addition of different antibacterial agents were inconsistent, and the antibacterial effect of the silver ion antibacterial agent with the glass network structure was the best.

Using internal extrusion and external mixing to add 2% antibacterial agent 3#, the prepared powder coating has excellent physical properties and excellent antibacterial properties.
The coating still has excellent antibacterial properties after washing, boiling, high temperature, and ultraviolet light treatment.
which performed.

This product can be applied to the surface coating of metal structural parts, and the coated workpieces are suitable for use in different antibacterial environments.
It can be applied to daily necessities, home appliances (refrigerators, freezers, air conditioners, washing machines, etc.
), auto parts, construction materials, medical materials, food industry supplies, etc.
; it can effectively protect the surface of the material, reduce the growth of bacteria, and prevent the spread of diseases .