The ratio of refrigerator foaming materials should be formulated according to factors such as the type, density, and hardness of the foaming materials. The commonly used ratio is polyurethane: Freon: catalyst = 100:65:3. Pay attention to uniform stirring when mixing.
1.Types of foaming materials
The foaming materials used in refrigerators are generally a mixture of polyurethane foam and Freon. Polyurethane foam has a fast foaming speed and high hardness, and Freon has good thermal insulation performance. Therefore, their mixing ratio is very important, which not only determines the thermal insulation effect of the refrigerator, but also affects the foaming effect and the improvement of refrigeration efficiency.
2.Ratio
Generally speaking, the ratio of refrigerator foaming materials is polyurethane: Freon: catalyst = 100:65:3, and there are also cases where appropriate adjustments are made according to different needs. It should be noted that the ratio of foaming materials produced by different manufacturers may be different, so when choosing foaming materials, you should understand their detailed information.
The formula ratio of polyurethane foam is usually A material (combined polyether) B material (isocyanate) = 1: (1-1.1). The actual formula ratio may be adjusted depending on the specific application scenario and the required performance. The standard formula ratio of polyurethane foam is 1:1 to 1:1.1 of material A (combined polyether) and material B (isocyanate). This ratio is suitable for most general scenarios, but the actual ratio needs to be adjusted according to the performance requirements of the product density, hardness, etc. For example, high-density rigid foam may need to increase the isocyanate ratio to 1.1, while soft foam or low thermal conductivity materials need to be precisely controlled at 1:1 to ensure the uniformity of the foam cells.
3. Mixing method
Special attention should be paid when mixing refrigerator foam materials, because it will affect the realization of cooling and insulation effects. When mixing, polyurethane foam, freon and catalyst should be mixed together according to the ratio and stirred thoroughly to ensure uniform mixing. Under normal circumstances, a stirrer can be used for mixing for about 3-5 minutes to achieve a uniform mixing state. It should be noted that if the mixing time is too long or the foaming amount is too large, bubbles will be generated inside the refrigerator, affecting its service life and insulation effect.
Summary
The mixing ratio of refrigerator foaming materials is a highly technical issue, which requires certain professional knowledge to mix. When mixing, you need to pay attention to the type of foaming materials, the ratio and the mixing method to ensure that the quality and performance of the refrigerator foaming materials can meet the requirements. In order to obtain better results, you also need to choose a reliable foaming material manufacturer and suitable supporting equipment, and operate under the guidance of professionals.