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Whitewashing gypsum and preparing method thereof

A technology for plastering gypsum and gypsum powder, which is used in construction, building structure, covering/lining, etc., can solve the problems of short condensation of hemihydrate gypsum, low water resistance of products, and high energy consumption, and achieves reduction of dosage, improvement of water resistance, Simple preparation method

Inactive Publication Date: 2004-09-15
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the short setting of hemihydrate gypsum and poor water retention, it is necessary to add expensive water retention agents and retarders in production, accounting for about 40-50% of the product cost. Calcined hemihydrate gypsum and anhydrous gypsum are used to produce stucco gypsum. The shortcomings of high energy consumption and low water resistance of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Surface plaster plaster: Percentage by weight, anhydrite powder 86, hemihydrate gypsum 3, cement 9.35, potassium salt series activator 1.5, methyl cellulose (MC) water retaining agent 0.15.

[0017] The preparation method is: 1). The natural anhydrite is ground by an industrial ball mill, the fineness is controlled at 200 mesh, the sieve balance is 2.5%, and the specific surface area is 6000cm 2 / g. 2). Preparation of raw materials: Percentage by weight, anhydrite powder 86, hemihydrate gypsum 3, cement 9.35, potassium salt series activator 1.5, methyl cellulose (MC) water retaining agent 0.15. 3). The above raw materials were respectively Measuring and fully mixing in the mixer, it becomes plaster surface layer powder.

[0018] The construction water consumption is calculated according to the standard water consumption with a slurry diffusion diameter of 165±5mm. After 24 hours of construction, it is advisable to spray water at intervals for maintenance to fully hydra...

Embodiment 2

[0020] Bottom stucco gypsum: Percentage by weight, anhydrite powder 85, hemihydrate gypsum 3, cement 9.35, calcined alunite mineral powder 2.5, hydroxypropyl methylcellulose (HPMC) 0.15, the above mixture and fine sand less than 5mm The weight ratio is 1:1.5.

[0021] Its preparation method is: 1). Utilize the industrial ball mill to grind the natural anhydrite, the fineness is controlled at 200 mesh sieve balance less than 2.5%, and the specific surface area is at 6000cm 2 / g. 2). Preparation of raw materials: Percentage by weight, anhydrite powder 85, hemihydrate gypsum 3, cement 9.35, calcined alunite mineral powder 2.5, hydroxypropyl methylcellulose (HPMC) 0.15, the above-mentioned mixed material and less than 5mm The weight ratio of fine sand is 1:1.5. 3). The above-mentioned raw materials are measured separately and fully mixed in the mixer to form the plaster base material.

[0022] The construction water consumption is calculated according to the standard water consu...

Embodiment 3

[0024] Surface plaster plaster: by weight percentage, anhydrite powder 88.8, hemihydrate gypsum 8, calcined industrial alunite 3, hydroxyethyl methylcellulose (HEMC) 0.2.

[0025] Its preparation method is: 1). Utilize the industrial ball mill to grind the natural anhydrite, the fineness is controlled at 200 mesh, the sieve balance is 2.6%, and the specific surface area is 5000cm 2 / g; 2). Raw material preparation: by weight percentage, anhydrite powder 88.8, hemihydrate gypsum 8, calcined industrial alunite 3, hydroxyethyl methylcellulose (HEMC) 0.2; 3). The above-mentioned raw materials were respectively Measuring and fully mixing in the mixer, it becomes plaster surface layer powder.

[0026] initial setting

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Abstract

The invention relates to a building brushing plaster and preparing method, including semiwater plaster and water retention agent, its character: also anhydrite powder and exciter is added to it, where wt% of each component: anhydrite powder 80-90, semwater plaster 3-13, exciter 1-7 and water retention agent 0.1-0.3. its preparing method: 1), milling natural anhydrite into powders by industrial ball mill, where the particle size is that the rest is less than 3% by 200 eye screen and the specific surface area is 4500-7000 sq cm / g; 2), preparing raw material: according to the demand, additionally adds in hydraulic cementitous material, which accounts for 0-15% of total weight; 3) weighing all the raw materials, mixing in the mixer to make the brushing plaster powder at once. The fine sand less than 5 mm can be added to mixed raw materials according to the demand to make the bushing substrate. It has water proofness.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a building plaster plaster and a preparation method thereof. Background technique [0002] The plastering project is an important part of construction engineering. So far, most of the plastering materials used in my country are cement mortar, cement mixed mortar and lime. The disadvantages of these traditional plastering materials are large dry shrinkage and poor cohesive force. Therefore, hollowing, cracking and other disadvantages are unavoidable, which affects the quality of decoration projects. Plastering gypsum has the characteristics of fast setting and hardening, light weight, energy saving, fineness, high bonding strength, no hollowing and cracking, and good fire resistance. It is a new type of plastering material with superior performance. It has developed rapidly in industrially developed countries and has become the mainstream of wall plastering. Our countr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/05C04B11/28C04B22/14C04B24/38C04B28/14C04B28/16E04F13/02
CPCC04B2111/00482C04B28/16
Inventor 杨新亚岳文海王锦华
Owner WUHAN UNIV OF TECH
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