Recently, we often receive calls from peers from all over the country asking about various technical problems that occur during the production of slow rebound sponge, in fact, these problems are encountered in the actual production process, including my own, why?
After all, polyurethane is also a chemical industry, these problems actually involve each raw material problems. Every raw material that participates in the chemical reaction is very important, whether it is the main material or a small material has its unique effect, so if one of the raw materials in the chemical reaction has a change, then it will naturally be reflected in the foaming process from the foam of the sponge, which is a basic principle, the reflected problem is a revelation if it is not a disease; if it is a disease, then If it is a pathology, then we should consider what to do to solve it; if it is a revelation to us, then we should consider how to use it or perfect it, to know that many evolution and invention are developed in the revelation.
For example: we all know that the current domestic slow rebound polyether manufacturers have Shanghai High Bridge’s 2000, Nanjing Jinpu’s 1070, on the two slow rebound polyether, although its hydroxyl value is 240, but in the actual production of their chemical activity is very different from each other, a few years ago, 2000 and 1070 without adjusting other raw materials can be used in place of each other, however A few years ago, 2000 and 1070 can be used in place of each other without making adjustments in other raw materials, but today, a few years later, they have formed their own characteristics, and can no longer be used in place of each other.
Of course, the current domestic production of slow rebound polyether is far more than these two manufacturers, so each slow rebound sponge manufacturers use raw materials is difficult to unify, which also includes a variety of small materials. This has formed each enterprise has its own formula, in terms of slow rebound polyether has a better open-hole and stability. Slow rebound polyether with better porosity is a little less in the production process, the amount of porosity-opening agent, and the amount of silicone oil (stabilizer) compared to its dosage should be increased appropriately; conversely, if you use a slow rebound polyether more stable or more closed gas type, then the amount of porosity-opening agent in the production process should be a little more, and the amount of silicone oil should be slightly lower.
So how can we determine the amount of opening agent and silicone oil to add? In the polyurethane industry due to the slow rebound sponge and other sponges are different, such as ordinary cotton high resilience sponge no matter how many manufacturers, but their production formulas can be said to be similar, and can even be said to be basically the same, while the slow rebound sponge is different its formula is ever-changing, so to pattern positioning openings and silicone oil dosage is absolutely impossible thing, but no matter how the basic principle or not away from Among them, no matter how to change as long as the familiar refinement to master its laws of operation can also be handy, the amount of opening agent regardless of the slow rebound sponge density you are issued, as long as the sponge issued at the end of the reaction can see the level of a little gas can be put, but the bubbles put must not be too large, the larger the bubble pore will be coarse, which also indicates two problems, a silicone oil additive is not enough, need to increase a certain percentage of Second, if you cut open the body to see the stomata normal, then it means that the amount of porosity-opening agent added is high, should reduce the amount of porosity-opening agent added.
