Raw material requirements for PVC foam board

PVC foam board, also known as Chevron board, has good heat insulation, heat preservation, sound insulation, light load-bearing properties, etc., due to other heat preservation materials, and is easy to operate, highly mechanized, time-saving, and labor-saving. What are the raw material requirements for PVC foam board? Let's take a look together.

　　Resin: PVC generally uses Type 8 resin, which has fast gelation speed during processing, relatively low processing temperature, stable product quality, and easy control of density. In recent years, many manufacturers have switched to Type 5 resin.

　　Stabilizer: The choice of stabilizer takes into account the environmental protection and good effect of rare earth stabilizers, but due to the relatively high price, they have not been promoted. In the future, as environmental protection requirements increase, the market for rare earth stabilizers will usher in a bright prospect . Calcium-zinc stabilizer has the problem of zinc burning and the stabilizing effect is slightly worse, and the dosage is small. At present, lead salt stabilizers are more commonly used. Due to the wide cross-section of the mold, the long flow channel and the high heat generation of yellow foaming, the stabilizer requires a high lead content and good stabilization effect, otherwise the products are prone to various types problem.

　　Foaming agent: the choice of foaming agent. The foaming agent AC releases a lot of heat during the decomposition process, which is likely to cause yellowing in the middle of the section. This requires a certain amount of white foaming agent to decompose to absorb excess heat. , The foaming agent is required to have a large mesh in order to achieve uniform foaming without large cells.

　　Conditioner: Foaming regulator. Through years of research and development and improvement, the process technology of foaming regulator ACR is becoming more and more sophisticated, and its performance and quality are becoming more and more stable. The board should use a foaming regulator with a strong plasticized slow melt.

　　Lubricants: The selection of lubricants follows the principle of giving consideration to lubrication in the early, mid- and late-stages, so that the materials are protected by lubricants at all stages, and adhere to long-term stable production without precipitation and scaling.

　　Foaming aid: In order to improve the foaming quality and foam structure, a small amount of zinc oxide can be added as a foaming assistant, and a small amount of aluminum silicate can be added to reduce precipitation.

　　Pigment: In order to achieve a more beautiful effect, titanium dioxide and fluorescent whitening agent can be added, and antioxidants and ultraviolet absorbers can be added to improve weather resistance.

　　Filler: select light calcium carbonate instead of active calcium, and use high mesh number as the main choice.