Gypsum retarder capable of improving strength and binding strength of gypsum base material

Abstract

The invention provides a gypsum retarder capable of prolonging coagulation time of the gypsum base building material and improving strength and binding strength of the gypsum base material. The gypsum retarder comprises following components by weight percent: 20-45% of organic binding agent, 10-25% of animal albumen glue, 7-15% of sugar calcium, 0.5-1% of cellulose ether and 14-64.5% of caking inhibitor, wherein the animal albumen glue is one or more than one of blood albumen glue, fish skin glue, bone glue, lac or jelly glue which have the fineness of 200-300 meshes, and sugar calcium is a product prepared from waste molasses (which is a byproduct of sugar industry) and lime through emulsification. The gypsum retarder has advantages of simple formula, low cost, simple preparation method and strong adaptability to gypsum, and can be used for adjusting coagulation time of gypsum for building, phosphorus gypsum and desulphurized gypsum.

Description

technical field [0001] The invention relates to a regulator for building materials, in particular to a setting time regulator for gypsum-based building materials, and more particularly to a regulator that can prolong the setting time of gypsum-based building materials and simultaneously improve the strength and bonding strength of gypsum-based building materials. Gypsum retarder. Background technique [0002] Hemihydrate gypsum is an inorganic cementitious material, which can be used in the production of gypsum blocks, gypsum plastering mortar, gypsum decorative boards, gypsum putty, etc. Gypsum building materials have the characteristics of light weight, small deformation, low production energy consumption, and good dimensional stability , no cracking when dry and harmless to the human body, etc., but the early strength development of gypsum materials is fast, the setting and hardening time is short, and it usually loses fluidity in 5min-30min, while most gypsum products re...

AI Technical Summary

Problems solved by technology

[0002] Hemihydrate gypsum is an inorganic cementitious material, which can be used in the production of gypsum blocks, gypsum plastering mortar, gypsum decorative boards, gypsum putty, etc. Gypsum building materials have the characteristics of light weight, small deformation, low production energy consumption, and good dimensional stability , no cracking when dry and harmless to the human body, etc., but the early strength development of gypsum materials is fast, the setting and hardening time is short, and it usually loses fluidity in 5min-30min, while most gypsum products require an operable time of 90min Therefore, it is necessary to delay the operable time of gypsum-based materials by adding a certain amount of retarder, but the retarder will have a greater impact on the strength and bond strength of gypsum while retarding.

Commonly used gypsum retarders are inorganic acids or organic acids. Such retarders usually cause serious loss of strength and bond strength of gypsum products, thus limiting the popularization and application of gypsum building materials to a certain extent.

[0003] Because animal protein glue has the effect of prolonging the hydration process of hemihydrate gypsum, and animal protein glue has a strong bonding ability, in recent years, people's research on bone glue protein gypsum retarder has become increasingly active. From the current research situation, it can be concluded that It can be seen that the retarding effect of bone glue protein gypsum retarder is good, and the setting time of gypsum can be obviously prolonged at a lower dosage, and the strength loss rate of gypsum products is much smaller than that of inorganic acid or organic acid retarder. However, the strength and bond strength loss rate of gypsum products will still increase with the prolongation of retarding time, which still limits the use of gypsum-based materials that require a long operating time. In addition, only bone glue protein is used as retarder , the cost is also higher

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