| 摘要 |
<p>PURPOSE:To provide a foaming flame retarder which is inexpensive and has high transparency and excellent stability and coating workability, prepd. by reacting a phosphorus-contg. inorganic acid directly with polyhydric alcohol. CONSTITUTION:A phosphorus-contg. inorganic acid (e.g. phosphoric or tripolyphosphoric acid) and a polyhydric alcohol (e.g. pentaerythritol or sorbitol) in a molar ratio of 1 : about 0.5-4 are heated at about 10-200 deg.C for about 10min- 48hr under agitation for interaction. The reaction product is cooled to obtain the foaming flame retarder in transparent liquid. Unlike conventional halogen-contg. flame retarders, the flame retarder generates no toxic gas and, as compared with known flame retarder consisting of phosphate, polyhydric alcohol or amino resin, it is low in material cost, has good storage stability and coating workability and forms a coating film with high transparency.</p> |
