CHARACTERISTICS OF THE MICROSTRUCTURE OF A GYPSUM WALL PLATE WITH A HIGH STARCH LEVEL AND A HIGH DISPERSANTER LEVEL

摘要

1. A gypsum wallboard, comprising: a hardened gypsum aggregate formed between two substantially parallel coating sheets, wherein the hardened gypsum aggregate has voids generally distributed throughout the hardened gypsum aggregate, the voids have walls with an average thickness of from about 30 to about 200 microns . ! 2. The gypsum wall plate according to claim 1, where the walls of the voids have an average thickness of from about 50 to about 200 microns. ! 3. The gypsum wall plate according to claim 1, where the walls of the voids have reinforced sealed surfaces. ! 4. The gypsum wall plate according to claim 3, in which the hardened gypsum aggregate is made of a gypsum-containing suspension, including: water, gypsum, gelatinized starch, present in an amount of from about 0.5% by weight to about 10% by weight based gypsum mass; naphthalene sulfonate dispersant present in an amount of from about 0.2% by weight to about 2% by weight based on the weight of gypsum; sodium trimethaphosphate present in an amount of from about 0.1% by weight all to about 0.4% by weight based on the weight of the building gypsum, and fiberglass present in an amount of from 0 to about 0.2% by weight based on the weight of the building gypsum. ! 5. The gypsum wallboard of claim 4, wherein the gelatinized starch is present in an amount of from about 0.5% by weight to about 4% by weight based on the weight of the building gypsum. ! 6. Gypsum wallboard according to claim 4, where the ratio of water / building gypsum is from about 0.7 to about 1.3. ! 7. G