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

A gypsum retarder and bond strength technology, applied in the field of gypsum retarder, can solve the problems of gypsum product strength and bond strength loss, increase in strength and bond strength loss rate, gypsum strength and bond strength influence and other issues , to achieve the effect of strong adaptability of gypsum, improved strength and bond strength, and low cost

Active Publication Date: 2014-10-08
广东龙湖科技股份有限公司
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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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Formula

[0022] Polyvinyl alcohol 35%

[0023] Bone glue with a fineness of 250 mesh 10%

[0024] Sugar Calcium 15%

[0025] Instant Methyl Hydroxypropyl Cellulose Ether 1%

[0026] Fineness of 300 mesh heavy calcium powder 39%

[0027] 2. Preparation

[0028] Weigh raw materials according to the above ratio, stir in a dry powder mixer for 15 minutes, and pack.

[0029] 3. Performance test

[0030] Get three parts of Sichuan Longyuan brand building gypsum with the same specifications, one part does not add retarder, one part adds the retarder prepared in Example 1 of 0.2% of building gypsum weight, one part adds 0.2% of building gypsum weight Citric acid, according to GB / T 17669.4-1999 "Determination of Physical Properties of Building Gypsum Plaster" and GB / T 17669.3-1999 "Determination of Mechanical Properties of Building Gypsum" standards, the various properties of building gypsum are tested, and the results are as follows:

[0031]

Embodiment 2

[0033] 1. Formula

[0034] Polyvinyl alcohol 25%

[0035] 300 mesh blood protein glue 20%

[0036] Sugar Calcium 10%

[0037] Instant Methyl Hydroxypropyl Cellulose Ether 0.5%

[0038] Dolomite powder with a fineness of 350 mesh 44.5%

[0039] 2. Preparation

[0040] Weigh the raw materials according to the ratio in the above table, stir in a dry powder mixer for 15 minutes, and pack.

[0041] 3. Performance test

[0042] Take three parts of Sichuan Hongda Group industrial by-product gypsum-phosphogypsum with the same specifications, one part does not add retarder, one part adds the retarder prepared in Example 2 with 0.2% by weight of phosphogypsum, and one part adds 0.2% citric acid by weight of phosphogypsum, according to GB / T 17669.4-1999 "Determination of physical properties of building gypsum paste" and GB / T 17669.3-1999 "Determination of mechanical properties of building gypsum" to test the various properties of phosphogypsum , the result is as follows:

[0043]...

Embodiment 3

[0045] 1. Formula

[0046] Polyvinyl alcohol 35%

[0047] 300 mesh blood protein glue 25%

[0048] Sugar Calcium 15%

[0049] Instant Methyl Hydroxypropyl Cellulose Ether 0.7%

[0050] Fineness of 300 mesh heavy calcium powder 24.3%

[0051] 2. Preparation

[0052] Weigh the raw materials according to the ratio in the above table, stir in a dry powder mixer for 15 minutes, and pack.

[0053] 3. Performance test

[0054] Take three parts of Chongqing Luohuang Power Plant's by-product gypsum with the same specifications - desulfurization gypsum, one part does not add retarder, one part adds the retarder prepared in Example 3 with 0.2% by weight of desulfurization gypsum, and one part adds phosphorus Gypsum weight 0.2% citric acid, in accordance with GB / T 17669.4-1999 "Determination of Physical Properties of Building Gypsum Plaster" and GB / T 17669.3-1999 "Determination of Mechanical Properties of Building Gypsum" to test the various properties of desulfurized gypsum, The r...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38
Inventor 李英丁洪永顺
Owner 广东龙湖科技股份有限公司
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