The reason why PVC foam board can have good performance is inseparable from the raw materials used in its production. The more obvious the effect of the raw materials it uses, the more obvious the effect of the product after the production is. Product. Of course, the quality of any materials used is different, so different quality levels have been formed for the products after production. Let's take a look at the requirements for the use of its raw materials.
1. The use of pigment is mainly to make the PVC foam board more beautiful. Titanium dioxide and fluorescent whitening agent can be added. To improve the weather resistance, antioxidants and ultraviolet absorbers can be added.
2. Resin materials Generally, type 8 resin is used for PVC. The gelation speed is fast during processing, the processing temperature is relatively low, the product quality is stable, and the density is easy to control. In recent years, many manufacturers have switched to Type 5 resin.
3. The choice of stabilizer is to take into account the environmental protection and good effect of rare earth stabilizer, but because the price is relatively high, it has not been promoted. However, with the increase in environmental protection requirements in the future, the market for rare earth stabilizers will usher in a bright future. Calcium-zinc stabilizers have problems with zinc burning and slightly less stabilizing effect. Currently, most of them are lead salt stabilizers. Foamed boards have a wide cross-section of the mold, long runners, and yellow foaming to generate more heat. The stabilizer is required to have a high lead content and a good stabilizing effect, otherwise the product is prone to various problems. .
4. The selection of foaming agent for PVC foaming board, because the foaming agent AC emits a lot of heat during the decomposition process, which easily causes yellowing in the middle of the section. This requires a certain amount of white foaming agent to be decomposed to absorb excess. The effect of thermal energy requires a large number of foaming agents to achieve uniform foaming without large cells.
5. Foaming regulator. Through years of research and development, the process technology of foaming regulator ACR is becoming more and more sophisticated, and the performance and quality is more and more stable. According to the thickness of the foamed board, the thin board should be selected to be plasticized quickly. A foaming regulator with high strength of plasticized slow solution should be selected.
6. The selection of lubricants follows the principle of taking into account the lubrication in the early, middle, and later stages, so that the materials are protected by lubricants at all stages, and adhere to stable production for a long time without precipitation.
Foaming assistant: In order to improve the foaming quality and foam structure, a small amount of foaming assistant zinc oxide can be added, and a small amount of aluminum silicate can be added to reduce precipitation.
7. The choice of filler is light calcium carbonate, and no active calcium is needed.
The above is the introduction of the raw materials used in the PVC foam board. We can see that the better the quality of its raw materials, the better the quality of the products produced. Therefore, we must go through a strict control of raw materials when producing.
