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A special water reducer for gypsum and its preparation method

A technology of water reducing agent and gypsum, applied in the field of chemical materials for construction, can solve problems such as complicated operation, and achieve the effects of long setting retardation time, good dispersing ability and high water reducing rate

Active Publication Date: 2015-08-12
YUEYANG ORIENTAL YUHONG WATERPROOF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They are all formed by free radical polymerization of compounds containing carboxylic acid groups, sulfonic acids, and amides. However, this process requires the use of dispersants and auxiliary dispersants in the application process, and the operation is cumbersome.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Allyl polyether TPEG: acrylic acid: water: dimethyl allyl phosphonate: acryloyl dimethylaminoethyl ester: initiator: sodium hydroxide = 1: 4: 200: 1.5: 1.2: 0.6: 0.55: (Each component is in molar ratio) Feed, heat up to 45 ° C, undergo copolymerization reaction, after 4 hours of reaction, a light yellow viscous transparent liquid is obtained, and a special water reducer for gypsum with a solid content of 40% is obtained.

Embodiment 2

[0026] Allyl polyether TPEG: acrylic acid: water: diethyl allyl phosphonate: acrylamide: initiator: potassium hydroxide = 1: 4: 200: 2.0: 1.2: 0.6: 0.45 (each component is massaged Raise the temperature to 45°C, and undergo copolymerization reaction. After 4 hours of reaction, a light yellow viscous transparent liquid is obtained, and a special water reducer for gypsum with a solid content of 40% is obtained.

Embodiment 3

[0028] Allyl polyether TPEG: acrylic acid: water: 2-propenyl phosphonic acid diethyl ester: dipropylene dimethylamine: initiator: ethylenediamine=1: 4: 200: 1.5: 1.5: 0.6: 0.25 ( Each component is fed in a molar ratio), heated to 45°C, undergoes a copolymerization reaction, and after 4 hours of reaction, a light yellow viscous transparent liquid is obtained, and a special water reducer for gypsum with a solid content of 40% is obtained.

[0029] In order to evaluate the dispersion performance of the special water reducer for gypsum of the present invention on cement, the fluidity and standard consistency of building gypsum are measured with reference to GB9776-88 "Building Gypsum".

[0030] The fluidity test follows the following method: pour 125g of water and a certain amount of water reducer into the mixer and mix evenly, add 200g of construction gypsum within 5s, and mix and stir for 35s to obtain a gypsum slurry. Then quickly pour it into the ring mold cylinder, scrape off...

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PUM

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Abstract

The invention discloses a special water reducing agent for gypsum. The special water reducing agent is prepared from allyl ether, acrylic acid and allyl phosphonate which are used as monomers as well as a cationic monomer, an alkali neutralizer and an initiator through copolymerization reaction. The special water reducing agent for the gypsum is high in water reducing rate, strong in delayed coagulation and good in adaptability to the gypsum, avoids formaldehyde pollution in the production process, and is particularly adaptive to building gypsum and other gypsum products.

Description

technical field [0001] The invention relates to a special water reducer for gypsum, which belongs to the field of chemical materials for construction. Background technique [0002] Gypsum is a rich non-mineral resource and a prosperous material with good technological performance. It is easy to process, low in energy consumption, and has excellent properties such as light weight, fast condensation, low radioactivity, sound insulation, heat insulation, and good fire resistance. [0003] However, research on gypsum superplasticizers obviously lags behind the development of concrete superplasticizers. The existing polycarboxylate superplasticizers are suitable for high water reducing rate, good slump retention performance, fast strength growth and good appearance quality. Prepare high-strength, ultra-high-strength concrete, high fluidity and self-compacting concrete. However, gypsum is different from cement, and the relevant research on polycarboxylate superplasticizers cannot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F230/02C08F216/20C04B24/26C04B103/30
Inventor 王虎群熊卫锋段文锋
Owner YUEYANG ORIENTAL YUHONG WATERPROOF TECH
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