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Gypsum water-reducing agent

A technology of water reducing agent and gypsum, applied in the field of gypsum water reducing agent, can solve the problems of large gas content, poor applicability, low water reduction rate, etc.

Inactive Publication Date: 2018-10-19
徐州市贾汪区怀强工贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, commercially available gypsum water reducers mainly include lignin sulfonates, naphthalenesulfonic acid formaldehyde condensation products, sulfonated melamines, polycarboxylic acid series, etc. Polymer and sulfonated melamine high-efficiency water-reducing agents generally have defects such as poor applicability, low water-reducing rate, large air content, insignificant reinforcement effect, serious retardation, and damaged strength.

Method used

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Embodiment Construction

[0013] A gypsum water reducer, characterized in that it comprises the following raw materials in parts by weight: 300-350 parts of polyoxyethylene ether, 20-30 parts of acrylic acid, 10-20 parts of styrene, 5-10 parts of vinyl phosphate, 2 - 1-5 parts of acrylamide-2-methylpropanesulfonic acid, 580-650 parts of water, 1-5 parts of initiator, 1-3 parts of molecular weight regulator; also includes 10-30 parts of emulsion, the emulsion preparation steps are as follows:

[0014] (1) Preparation of poly(butyl acrylate-styrene) seed emulsion:

[0015] Weigh butyl acrylate, styrene, sodium lauryl sulfate, OP-10, ethylene di Add alcohol dimethacrylate, propyl methacrylate and deionized water to the reaction bottle, heat up to 80°C while stirring, stir at constant temperature for 20-30min, weigh the initiator potassium persulfate KPS, the amount of KPS is 0.006 of water ~0.008 times, add to the reaction bottle, stir at 80°C for 10-15min to obtain the seed emulsion;

[0016] (2) prepa...

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Abstract

The invention relates to a gypsum water-reducing agent which is prepared from the following raw materials in parts by weight: 300 to 350 parts of polyoxyethylene ether, 20 to 30 parts of acrylic acid,10 to 20 parts of styrene, 5 to 10 parts of ethylenephosphonic acid, 1 to 5 parts of 2-acrylamide-2-methyl propane sulfonic acid, 580 to 650 parts of water, 1 to 5 parts of initiator, 1 to 3 parts ofmolecular weight modifier, and 10 to 30 parts of emulsion. According to the water-reducing agent, the water absorption rate of gypsum at the later period can be effectively reduced, and the long-timeperformance is improved.

Description

technical field [0001] The invention relates to the field of gypsum additives, in particular to a gypsum water reducer. Background technique [0002] Gypsum has the advantages of thermal insulation, sound absorption, fire prevention, decoration and environmental protection, and is more and more favored by the construction industry. With the promotion of national energy conservation and emission reduction policies, the application of gypsum products will be more extensive. The theoretical water consumption of gypsum is 18.6%, but the actual mixing water consumption reaches 60%-80%, which makes the porosity of gypsum products reach 40%-55% and the strength is low after hardening. Another disadvantage of gypsum is that the setting time is short. For the convenience of construction, retarders are added to prolong the setting time of gypsum, but the hardening strength will be greatly reduced. The water-plast ratio is the main factor affecting the porosity and hardening strength...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F212/08C08F220/58C08F230/02C08F220/18C08F222/14C04B24/26C04B103/30
CPCC04B24/246C04B2103/302C08F220/18C08F220/1804C08F283/06C08F220/585C08F220/1803C08F212/08C08F222/102
Inventor 庄怀强
Owner 徐州市贾汪区怀强工贸有限公司
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