Saint-Gobain Placo

Hao Song

Ke Zhang

Huifen Li

Xiaotong Gao

Kane Ironside

Dongxiao Shao

The present invention provides a composition, a gypsum board and their preparation method and the use of ascorbic acid as an anti-sagging additive in a gypsum board. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises hemi-hydrate gypsum, water and a compound comprising group and no carboxylate groups. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum board of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum board to meet the demands of the customer.

Anti-sagging gypsum product and a method to manufacture

A gypsum board composition was disclosed which comprises stucco, adhesive, water and additive for improving bonding, wherein the additive for improving bonding is shown in chemical formula as MM(OH)(A).mHO, wherein Mis a divalent metal ion, Mis a trivalent metal ion, and Ais an interlayer anion, and wherein Mand Mare different metals. Also, a gypsum board made with the composition of the above and a method for using a compound shown in the aforesaid chemical formula were disclosed.

Gypsum product composition, gypsum products, and a method for using a compound in gypsum board

The present invention provides a gypsum composition, a gypsum board and their preparation method and the use of DHA as an anti-sagging additive in a gypsum product. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises gypsum, and an anti-deformation additive, wherein the anti-deformation additive comprises at least one selected from a group consisting of dehydroascorbic acid, dehydroascorbate and semidehydroascorbic acid. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum product of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum product to meet the demands of the customer.

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Shanghai, China

Hao Song