Polycarboxylic acid water reducing agent preparation method, and retarder and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in retarder and its preparation, and in the field of preparing polycarboxylate superplasticizer, which can solve the problems of serious retarding effect and affecting the strength of gypsum, and achieve good retarding effect and prolong The effect of retarding time and strength loss is small

Inactive Publication Date: 2018-10-16
BEIJING NEW BUILDING MATERIALS PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, although there are many polycarboxylate superplasticizers used in gypsum building materials, most of the polycarboxylate macromolecules have serious retarding effects and affect the strength of gypsum to a large extent. Therefore, a single polycarboxylate additive Often cannot meet the actual production needs

Method used

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  • Polycarboxylic acid water reducing agent preparation method, and retarder and preparation method thereof
  • Polycarboxylic acid water reducing agent preparation method, and retarder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of polycarboxylate water reducer: Add 395g of water, 27g of acrylic acid, 240g of isobutylene alcohol polyoxyethylene ether with a molecular weight of 2400, 2g of ammonium persulfate and 1.6g of thioglycolic acid into a 1000ml four-necked flask, heat up to 60°C, Stir the reaction for 4h, stop stirring, keep warm for 1h, and cool. After the reaction solution was cooled to a temperature lower than 30°C, it was neutralized to a pH of 7 with a 30% NaOH aqueous solution. The prepared polycarboxylate water reducer has a solid content of about 40 wt%.

[0036] The preparation of retarder: take by weighing 5g sodium tripolyphosphate, 10g citric acid and 5g calcium enhancer (the weight ratio of calcium hydroxide, calcium oxide, calcium carbonate is 35:45:10) and put into the mixer, through fully Mix well and pour out. Slowly add the above mixture into 200 g of the prepared polycarboxylate superplasticizer with a solid content of 40 wt%, and stir evenly until there ...

Embodiment 2

[0038] Weigh 7g of sodium tripolyphosphate, 10g of citric acid and 7g of calcium enhancer (the weight ratio of calcium hydroxide, calcium oxide, and calcium carbonate is 35:45:10) and put them into a mixer, mix well and pour out. Slowly add the above mixture into 190 g of the polycarboxylate superplasticizer with a solid content of 40 wt% prepared in Example 1, stir evenly until there is no powdery material in the slurry, and let it stand for 10 minutes.

Embodiment 3

[0040] Weigh 5g of sodium tripolyphosphate, 12g of citric acid and 5g of calcium enhancer (the weight ratio of calcium hydroxide, calcium oxide, and calcium carbonate is 35:45:10) and put them into a mixer, mix well and pour out. Slowly add the above mixture into 195g of the polycarboxylate superplasticizer with a solid content of 40wt% prepared in Example 1, stir evenly until there is no powdery material in the slurry, and let it stand for 10 minutes.

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Abstract

The present invention discloses a polycarboxylic acid water reducing agent preparation method, and a retarder compounded with the prepared polycarboxylic acid water reducing agent. According to the method, a water phase free radical copolymerization reaction is performed in water by using acrylic acid and other unsaturated acids as a small monomer, using isobutylene alcohol polyoxyethylene ether as a large monomer, using persulfate as an initiator, and using thioglycolic acid and/or mercaptopropionic acid as a chain transfer agent. According to the present invention, the retarder comprises, byweight, 75-90 parts of the polycarboxylic acid water reducing agent (calculated as the weight of the effective component), 1-10 parts of sodium tripolyphosphate, 10-25 parts of citric acid, and 1-10parts of a calcium increasing agent, has good retarding effect, and can significantly prolong the retarding time of desulfurized building gypsum, such that the desulfurized gypsum can overcome the drawbacks that the construction requirement cannot be met due to the rapid solidification, and the strength loss of the desulfurized gypsum after solidification is low.

Description

technical field [0001] The present application relates to but not limited to the field of building materials, in particular but not limited to a method for preparing polycarboxylate water reducer and a retarder and its preparation method. Background technique [0002] In the building materials industry, a large amount of gypsum needs to be consumed. Using desulfurized gypsum instead of natural gypsum as a gypsum building material can not only make full use of desulfurized gypsum, solve the problem of solid waste storage, but also effectively reduce production costs, effectively utilize resources and protect the environment. are of great significance. Desulfurized gypsum is dehydrated and calcined to make building gypsum, and all technical indicators can meet the requirements of national standards, and can be used as raw materials for various gypsum products. [0003] However, the early strength of gypsum materials develops rapidly, and the setting and hardening time is shor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/02C04B24/26C04B103/30C04B103/22
CPCC04B24/2605C04B24/267C04B40/0039C04B2103/22C04B2103/302C08F2/38C08F4/30C08F283/065C04B22/16C04B24/06C04B22/064C04B22/10C08F220/06C08F222/02
Inventor 尹东杰何亮王鹏起谭丹君王莹
Owner BEIJING NEW BUILDING MATERIALS PLC
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