SU1217838A1 - Method of manufacturing gypsum-paperboard sheets - Google Patents

Description

one

The invention relates to building materials and can be used in enterprises producing lightweight gypsum products, mainly gypsum plasterboards.

The aim of the invention is to increase strength, improve nailing, decrease thermal conductivity, increase sound absorption of finished products and increase adhesion of cardboard to the gypsum core.

The method is carried out as follows.

A sulphite-yeast mash (SMB) liquid concentrate and iron sulphate are introduced into the container, the mixture is heated to a predetermined temperature (60-100 s) and held for 5-30 minutes. The mixture is then mixed with water and a solution of hydrated lime or caustic soda, the amount; which is adjusted so that the pH of the mixture is 5.6-7.4. In a gypsum blender, the gypsum is mixed into the hoop (its prepared mixture, glass fiber and pre-foamed foaming agent. The resulting gypsum composition is fed to the molding of the products with their subsequent day,

In the process of mixing the SDB with the gum sulfate, when heated, the hydrolysis of the latter occurs with the release of sulfuric acid, under the action of which, as well as under the influence of

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0.080.030.03

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at elevated temperatures in lignosulfonates, active functional groups appear that enhance the adhesion properties of the RRT.

When diluted with water in a mixture of SDB with iron sulphate of a saturated solution of lime or 10% solution of caustic soda to a pH in the range from 5.6 to 7.4, a highly dispersed gel of iron oxide hydrate and iron oxide hydrate is formed, which adsorb polymer molecules of lignosulfonates significantly strengthen their adhesive ability to plaster and a cardboard. colmatization temporarily occurs. gypsum material with finely dispersed nitrate hydrate and iron oxide hydrate, which increases the strength of products and improves their portability. Hydrate of nitrous oxide and iron oxide, filling the pores in the material, reduces the number of open pores and their size, as a result of which the heat transfer slows down, i.e., the coefficient of thermal conductivity decreases and the degree of sound absorption increases.

The compositions of gypsum compositions and the mode of their preparation are given in table. one.

Comparative data of the physicomechanical properties of samples of 14 mm thick gypsum board sheets, obtained by the proposed method are presented in Table. 2

Table 1

5.6 6.7 7.4 5.6 6.7 7.4

Note. In examples 1, 3 and 6 used a saturated solution

lime, in the remaining 10% solution of caustic soda.

table 2

The long table.

Claims (1)

METHOD FOR PRODUCING GYPSUM CARDBOARD SHEETS, including mixing technical lignosulfonates with water, a gypsum binder, a fibrous filler and a foaming agent, molding and drying of articles, characterized in that, in order to increase strength, improve nails, reduce thermal conductivity, increase the degree of sound absorption adhesion of cardboard to a gypsum core, technical lignosulfonates in an amount of 0.25-1.4% by weight of a binder are pre-mixed with iron sulfate in a quantity 0.1-0.48% by weight of the binder; heated to 60,000 ° C with exposure for 5-30 min, the resulting mixture was dissolved _with ryayut in water, a saturated ® 'lime solution or 10% caustic soda solution in an amount to provide a mixture pH 5,6-7,4, and then introduced into the remaining components of the gypsum mixture. SUn .. 1217838