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Modified additive for overburnt gypsum and preparation method of modified additive

An additive, gypsum technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as taking 14 days or more, and achieve improved cracking problems, consistency between inside and outside, surface strength improved effect

Pending Publication Date: 2022-07-12
SUZHOU XINGBANG CHEM BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For burnt building gypsum, that is, when the content of type III anhydrite phase is relatively high, aging treatment can be carried out to convert the anhydrite phase into hemihydrate gypsum, but aging generally takes 14 days or longer. make improvements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A modified additive for calcined gypsum and a preparation method thereof, comprising the following steps:

[0019] S1, first put the quick-hardening 42.5 grade sulfoaluminate cement of 500 parts by weight and the melamine water-reducing agent of 94 parts by weight into the mixer, stir and mix, and obtain the mixture, wherein, the melamine water-reducing agent adopts Suzhou Xingbang Chemical SM melamine water reducing agent produced by Building Materials Co., Ltd.;

[0020] S2, add 400 parts by weight of ash calcium, 5 parts by weight of suspension stabilizer and 1 part by weight of hydroxyethyl cellulose whose viscosity specification is 100000 Pa s in the mixer and stir to obtain modified additive for calcined gypsum , among which, the suspension stabilizer adopts ST-1001 suspension stabilizer produced by Suzhou Xingbang Chemical Building Materials Co., Ltd.;

Embodiment 2

[0022] A preparation method of modified additive for calcined gypsum, comprising the following steps:

[0023] S1, first drop into the mixer with the quick-hardening 42.5 grade sulfoaluminate cement of 400 parts by weight and the melamine water-reducing agent of 80 parts by weight, stir and mix to obtain a mixture;

[0024] S2, add 510 parts by weight of ash calcium, 5 parts by weight of ST-1001 suspension stabilizer and 5 parts by weight of hydroxypropyl methylcellulose whose viscosity specification is 40000 Pa s in the mixer and stir to obtain overburned Modified additives for gypsum;

Embodiment 3

[0026] A preparation method of modified additive for calcined gypsum, comprising the following steps:

[0027] S1, first drop into mixer with the quick-hardening 42.5 grade sulfoaluminate cement of 350 parts by weight and the melamine water-reducing agent of 60 parts by weight, stir and mix, obtain mixture;

[0028] S2, add 575 parts by weight of ash calcium, 5 parts by weight of ST-1001 suspension stabilizer and 10 parts by weight of hydroxypropyl methylcellulose with a viscosity specification of 400Pa s in the mixer and stir to obtain over-calcined gypsum with modified additives;

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PUM

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Abstract

The invention discloses a modified additive for overburnt gypsum and a preparation method thereof.The preparation method comprises the following steps that S1, 200-500 parts by weight of sulphoaluminate cement and 10-100 parts by weight of a water reducing agent are put into a mixer to be stirred and mixed, and a mixture is obtained; and S2, adding 350-650 parts by weight of ash calcium, 5-10 parts by weight of a suspension stabilizer and 1-30 parts by weight of cellulose ether into the mixer, and stirring to obtain the modified additive for overburnt gypsum. Through the mode, the modified additive for the overburnt gypsum and the preparation method of the modified additive can be added in practical application of various gypsum mortars, and the water consumption is reduced, the surface strength is improved and the cracking problem is improved while the same construction performance is maintained.

Description

technical field [0001] The invention relates to the field of modified additives for gypsum, in particular to a modified additive for calcined gypsum and a preparation method thereof. Background technique [0002] Gypsum used as a building material has many excellent properties such as light weight, fire resistance and sound absorption, and gypsum mortar has the characteristics of micro-expansion during the hydration and hardening process, which can avoid problems such as cracking. [0003] When gypsum is used as a cementitious material to produce gypsum board, gypsum mortar, etc., it needs to be calcined first to form a building gypsum with beta calcium sulfate hemihydrate as the main phase. According to the provisions of GB / T 9776 "Gypsum of Construction", the content of hemihydrate gypsum phase in calcined gypsum plaster should not be less than 75%, the content of type III anhydrite phase should not be more than 8%, and the content of dihydrate gypsum phase should not be m...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B28/14C04B111/34
CPCC04B40/0039C04B28/144C04B28/143C04B28/142C04B2201/50C04B2111/343C04B22/14C04B2103/302C04B22/064C04B24/383C04B2103/0068Y02W30/91
Inventor 钱佳佳苏新禄毛荣良时磊
Owner SUZHOU XINGBANG CHEM BUILDING MATERIALS