Preparation method of powder modified protein gypsum retarder

A gypsum retarder and powder modification technology, applied in the field of building materials, can solve the problems of low retardation efficiency, reduced strength, and high cost, and achieve high content of effective protein components, delayed setting time, and reduced centralized heat generation. Effect

Active Publication Date: 2021-01-05
JIANGSU NIGAO SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Gypsum retarders are mainly divided into organic acids and their soluble salts, alkaline phosphate, proteins, organic acids and their soluble salts retarders mainly include citric acid, sodium citrate, tartaric acid, potassium tartrate, etc. The best effect is citric acid and its salt, but it will significantly reduce the strength of building gypsum. The larger the dosage, the more obvious the strength reduction
Phosphate retarders mainly include sodium hexametaphosphate, sodium polyphosphate, sodium tripolyphosphate, sodium pyrophosphate, etc., but their retarding efficiency is low, the dosage is high, and the impact on strength is also great
Protein retarders include bone glue, peptone, etc., which have relatively little effect on t

Method used

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  • Preparation method of powder modified protein gypsum retarder
  • Preparation method of powder modified protein gypsum retarder
  • Preparation method of powder modified protein gypsum retarder

Examples

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Embodiment 1

[0023] A preparation method of powder modified opal plaster retarder, comprising the following steps:

[0024] a. Acid hydrolysis: put 30 parts by mass of protein material, 10 parts by mass of 31% hydrochloric acid and 40 parts by mass of water into the reactor, and carry out the hydrolysis reaction for 3-4 hours at a temperature of 85-90° C. to obtain solid Acid hydrolyzed protein solution with a content of 35-40%;

[0025] b. Modification: Leave 60 mass parts of the acid hydrolyzed protein solution obtained in step a in the reactor, then add 25 mass parts of diethylenetriaminepentamethylene phosphonic acid, 1 mass part of styrenesulfonic acid, 4 mass parts Parts of hydroxyethyl acrylate are kept at a temperature of 55-60°C for 1-1.5 hours to obtain a mixture;

[0026] c. Neutralization: cool down the mixture obtained in step b to 35-45°C, then add 3 parts by mass of potassium tartrate and 5 parts by mass of calcium hydroxide, and neutralize the pH value to 7-9 to obtain mod...

Embodiment 2

[0035] A preparation method of powder modified opal plaster retarder, comprising the following steps:

[0036] a. Acid hydrolysis: put 35 parts by mass of protein material, 18 parts by mass of 31% hydrochloric acid and 45 parts by mass of water into the reactor, and carry out the hydrolysis reaction at a temperature of 85-90° C. for 3-4 hours to obtain solid Acid hydrolyzed protein solution with a content of 35-40%;

[0037] b. Modification: Leave 60 mass parts of the acid hydrolyzed protein solution obtained in step a in the reactor, then add 25 mass parts of diethylenetriaminepentamethylene phosphonic acid, 1 mass part of styrenesulfonic acid, 4 mass parts Parts of hydroxyethyl acrylate are kept at a temperature of 55-60°C for 1-1.5 hours to obtain a mixture;

[0038] c. Neutralization: cool down the mixture obtained in step b to 35-45°C, then add 3 parts by mass of potassium tartrate and 5 parts by mass of calcium hydroxide, and neutralize the pH value to 7-9 to obtain mod...

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Abstract

The invention relates to the field of building materials, in particular to a preparation method of a powder modified protein gypsum retarder for gypsum building materials. The preparation method comprises the steps of protein acidolysis, organic phosphonic acid, styrene sulfonic acid and hydroxyethyl acrylate modification, potassium tartrate and alkali substance neutralization, perlite adsorption,drying, grinding and the like. The prepared powder modified protein gypsum retarder is high in effective protein component content and good in retarding effect, the coagulation time of gypsum can beremarkably prolonged due to the low doping amount, and the powder modified protein gypsum retarder has a good retarding effect in both neutral and alkaline environments; the powder modified protein gypsum retarder can be widely applied to gypsum self-leveling, plastering gypsum and other dry powder gypsum products, the interval between the initial setting time and the final setting time is effectively prolonged, and centralized heating in the gypsum hardening process is reduced; according to the preparation method of the powder modified protein gypsum retarder, no waste water, waste gas or solid waste is generated in the whole process, and the whole technological process can be subjected to line production.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing a powder-modified protein gypsum retarder for gypsum building materials. Background technique [0002] Gypsum is a green building material with excellent performance and can be recycled. my country's natural gypsum reserves rank first in the world. At the same time, the comprehensive utilization rate of industrial by-products is low. The cumulative stock of industrial by-product gypsum has exceeded 300 million tons. Gypsum can be widely used In plastering gypsum, self-leveling gypsum, gypsum board, GRC gypsum components and other products. Gypsum sets and hardens quickly, and requires prolonged operation time before it can be used. Gypsum retarder is an indispensable part of gypsum building materials. [0003] Gypsum retarders are mainly divided into organic acids and their soluble salts, alkaline phosphate, proteins, organic acids and their soluble salts ...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B14/48C04B103/22
CPCC04B24/003C04B40/0046C04B40/0042C04B2103/22C04B14/18
Inventor 吴开胜张朝辉王道正钱中秋徐建军
Owner JIANGSU NIGAO SCI & TECH
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