Relationship between rubber storage and temperature and humidity

Rubber is an important strategic material. It has a very close relationship with the development of production in various sectors of the national economy. With the development of China's economic construction, the demand for rubber is increasing, and the number of rubber products in stock is increasing day by day. In the storage of inventory rubber products, the main forms of rubber damage are aging, swelling, mildew, deformation and so on. Among them, aging and mildew of rubber products are closely related to temperature and humidity. When the temperature exceeds 35°C, oxygen and ozone in the air chemically react with the rubber, which makes the rubber product sticky and its strength decreases. When the air is too dry and the temperature is too high, the anti-aging agent in the rubber product will accelerate the volatilization and reduce the anti-aging properties of the rubber product. When the humidity is too high, brown or dark green spots will appear on the surface of the rubber product. This phenomenon is also known as mildew. The reason that rubber products are contaminated is that rubber products contain proteins (natural rubber), stearic acid esters (synthetic rubber) and other substances, which are suitable for the growth of molds. When the mold is suitable for growing temperature and humidity (temperature above 30°C and relative humidity above 75%), it will multiply, causing moldy rubber, resulting in decreased performance of rubber products. Therefore, the warehouse where rubber products are stored must have suitable temperature and humidity. Suitable temperature and humidity conditions for rubber products are: temperature -10 ~ 25 °C, relative humidity 50-70%.

The environmental conditions in which the rubber product is located, which causes cracking or hardening and degradation of the rubber properties over time, are called rubber aging phenomena. The main causes of aging are: oxidation, ozone cracking, thermal oxygen aging, optical spallation, mechanical stress, moisture, and other chemical media, variable metal ions, high-energy radiation, electricity and biology. The prevention of aging is focused on the right choice of rubber species and formula design, plus rigorous production concepts and proper storage methods. This will increase the lifespan of the finished rubber product and give it special functions it deserves. Icebird rubber dehumidifier adopts international advanced technology and selects world-class runner products. It has large dehumidification capacity and high efficiency.

The protein contained in rubber can promote the vulcanization of rubber and delay aging. However, the protein has strong water absorption, and it can introduce rubber to absorb moisture, mold, and reduce the insulation. Therefore, a rubber dehumidifier is needed. Proteins also have the disadvantage of increasing thermogenesis. Rubber dehumidifier can reduce indoor humidity. Makes the protein unable to absorb excess moisture. The moisture in the rubber does not exceed 1%. It can be volatilized during processing. However, when the moisture content is too high, it will not only make moldy during storage, but also affect the processing of rubber. The rubber dehumidifier can precisely control the indoor humidity. For example, the compounding agent tends to agglomerate when mixing; bubbles are easily generated during the rolling and extrusion process, and bubbles or sponges are generated during the vulcanization process.

Application of Rubber Dehumidifier in Rubber Industry

In order to improve the reproducibility and reproducibility of the rubber test results, the rubber was directly exposed to the prescribed temperature and humidity for a predetermined period of time before the test. Usually when the rubber needs to control the temperature and humidity, the standard temperature is (23±2)°C, and the standard humidity is relative humidity of 60% to 70%. When both temperature and humidity need to be controlled, the standard adjustment time is at least 16h. In the case where the control temperature is only 23°C or 27°C, the shortest adjustment time is 3h. When testing below room temperature or high temperature, the adjustment time should be sufficient to balance the sample with the environment.

Rubber products contain volatile substances that reduce their lifespan, whether in a humid environment or in a dry environment. The use of a rubber dehumidifier allows the humidity to be controlled in an optimal range to extend the life of the rubber.

Conventional dehumidifiers and large-scale dehumidifiers have three types of temperature-raising, temperature-adjusting, and temperature-reducing types. Temperature-enhanced dehumidifiers are mainly used for dehumidification and have no cooling function, so they are suitable for dehumidification sites without temperature requirements; thermostats and dehumidifiers. With a dehumidifying and cooling function and adjustable cooling capacity, it is particularly suitable for dehumidification sites where the heat load varies greatly. The cooling dehumidifier has a cooling function while dehumidifying, but the cooling capacity is not adjustable, so it is suitable for dehumidification occasions where the heat load is relatively large and there is no requirement for relative humidity.

The condenser of the rubber dehumidifier adopts air-cooling and water-cooling. The water-cooled large-scale dehumidifier adopts condensed water from the cooling tower or deep water introduced into the water cooler such as a reservoir to dissipate the refrigerant. Since the flow direction of the refrigerant in the closed inner sleeve is opposite to the flow direction of the cooling water in the outer sleeve water cooler, the specific heat of the cooling water flowing between the two concentric sleeves of the water cooler is several times higher than the specific heat of air (standard state). Therefore, water-cooled large dehumidifiers are more effective than air-cooled large-scale dehumidifier dehumidifiers with the same dehumidification capacity, and the energy-saving efficiency is increased by about 28%.