Evaluation of the Oxidation Resistance of Plastic Products by Ozone Test Chamber and Its Application Prospect

The ozone aging test chamber can be used for rubber products such as vulcanized rubber, thermoplastic rubber, cable insulation sheath and other products. Under static tensile deformation, they are exposed to air with constant ozone concentration and constant temperature in a closed and dark test chamber.

Time to test the sample, from the degree of cracking or other performance changes on the surface of the sample, use the ozone aging test chamber to scientifically and reasonably realize the aging cracking test of non-metallic materials and rubber products. To evaluate the ozone resistance of rubber Aging performance.

When plastics are exposed to natural or artificial environments during processing, storage, and use, their properties will gradually deteriorate and deteriorate, which is plastic aging.

Plastic aging resistance testing is mainly a high-intensity test that simulates various harsh conditions of plastic products in the actual environment, and reasonably predicts the service life of plastic products according to actual requirements.

The principle of plastic ozone aging test box corrosion:
Oxidation by ozone results in the breakdown of unsaturated organic molecules. Ozone molecules are combined on the double bonds of organic molecules to form ozonides. Spontaneous cleavage of ozonide produces a carboxyl compound and zwitterions with acidic and basic groups, the latter being unstable and decomposing into acids and aldehydes.

At the same time, ozone itself is not very stable, and it will spontaneously become oxygen and active oxygen atoms. Among them, active oxygen atoms are very easy to combine with organic matter and cause damage.
Ozone is present in very small amounts in the air, but it is a major cause of cracking in plastic products:
Plastic products are mainly composed of alkenes, alkynes and hydrocarbons. What they have in common is that they contain C=C bonds. Generally, the C=C bond is stable, but ozone in the air can cause the C=C bond to break because of its strong oxidizing properties. Cracking of rubber and plastic products.

Ozone aging test method:
Ozone is an extremely rare gas in the atmosphere, but it is extremely destructive to plastic materials. Ozone can irreversibly react with unsaturated bonds and reducing groups in the chemical structure of plastic materials, resulting in oxidative degradation of plastic materials , thus losing the value of use.

The ozone aging test of plastic materials is usually carried out in an ozone aging test chamber. The ozone required for the test is provided by an ozone generator, and its concentration can be adjusted by mixing with air through a mixer. The concentration of ozone is generally based on the environment where the material is actually used. conditions to determine.

In addition, the temperature, humidity and other factors in the ozone aging chamber can also be adjusted to achieve the purpose of the test, and then obtain the ozone aging resistance of the material and the behavior and law of ozone aging.

The operation method of the ozone aging test chamber is as follows:
1. Before operating the ozone aging test chamber, it is necessary to turn on its power supply and follow its heating button, and set the temperature according to its requirements. If the test temperature is lower than its ambient temperature, its refrigeration switch should be turned on;
2. If humidity treatment is required, the humidification switch should be turned on to set the humidity value according to the standard requirements;

3. During the ozone treatment work, first press the ozone button to adjust the air intake on the ozone generator to 1-2 liters per minute, so that the switch is turned to its automatic state, and the ozone aging test chamber begins to generate its ozone , and thereby control its concentration;
4. If you want to clearly observe the working conditions in the test chamber, you need to turn on the light switch;

5. When performing a static ozone aging test, the sample should be fixed on the sample rack and hung on the turntable to start, and the speed should be adjusted on the governor; if the dynamic ozone aging test is to be performed, it should be based on its The size of the sample adjusts the distance of the dynamic turntable and the stretching frequency, so as to remove all the static sample racks, so that when the stretching switch is turned on, the sample rack starts to stretch, and when the turntable switch is turned on, the sample price thus starting to rotate;

The application prospect of ozone aging test chamber:
The ozone aging test chamber is used for rubber products such as vulcanized rubber, thermoplastic rubber, cable insulation sheath and other products. Under static tensile deformation, they are exposed to airtight and dark air containing constant ozone concentration and constant temperature. The sample is tested at a predetermined time, and the degree of cracking or other performance changes on the surface of the sample is used to evaluate the ozone aging resistance of the rubber.

In recent years, the rubber industry has achieved a lot of development. The existing sub-sectors have grown steadily, while the new rubber sub-sectors have developed rapidly. However, at the same time, the rubber industry also has problems such as the environment, resources, disasters, and innovation. It is one of the important basic industries of the national economy.

It not only provides daily and medical light industrial rubber products that are indispensable for people’s daily life, but also provides various rubber production equipment or rubber parts for mining, transportation, construction, machinery, electronics and other heavy industries and emerging industries. Visible, There are many kinds of products in the rubber industry, and the backward industry is very broad.

The development of the ozone aging test chamber is attached to the rubber industry. According to data, from January to October 2012, the industrial output value of China’s rubber products industry increased by 6.47% year-on-year, and the output of comprehensive tires increased by 2.59% year-on-year. Among them, the output of radial tires increased by 3.13% year-on-year. %, the output of all-steel radial tires increased by 6.55% year-on-year, and the radialization rate reached 87.23%, an increase of 0.46 percentage points year-on-year. From this situation, the future development prospects of ozone aging test chambers are very broad.

Ozone test purpose:
Ozone Test Chamber (or called Ozone Aging Chamber and Ozone Aging Test Chamber) is design according to rubber being sensitive characteristic of to ozone, it simulate the environmental to accelerate the rubber aging process by ozone. It compared to different products(test sample) aging result each other according to the same ozone aging test conditions/standards, and get to comparable aging resistance performance.

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