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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 preparation of polycarboxylate superplasticizer, which can solve the problems of strength loss, strength reduction of gypsum products, reduction of retarder, etc., and achieve strength loss Small, good retarding effect, prolonging the effect of retarding time

Pending Publication Date: 2018-10-16
BEIJING NEW BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Small amounts of organic acids and their salts have a good retarding effect, but it will lead to a sharp decrease in the strength of gypsum products; phosphate retarders also have the problem of serious strength loss
The choice of retarder limits the promotion and application of gypsum building materials to a certain extent
Although there have been some studies on reducing the adverse effects of retarders on the strength of gypsum, they have not fundamentally solved the problem

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of polycarboxylate superplasticizer: add 410g water, 30g acrylic acid, 240g molecular weight is the isobutylene alcohol polyoxyethylene ether of 2400, 4.5g mass fraction is 27.5% hydrogen peroxide, 0.75g L-ascorbic acid in 1000 milliliter four-neck flask and 2.5g of mercaptopropionic acid, heated to 50°C, stirred and reacted for 4h, stopped stirring, kept warm for 1h, and cooled. The reaction solution was cooled to a temperature lower than 30° C., and neutralized to pH 7 with 30% NaOH by mass fraction. The solid content of the prepared polycarboxylate water reducer is about 40%.

[0032] The preparation of retarder: take by weighing 5g sodium tripolyphosphate, 10g citric acid and 4g 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 202 g of the prepared polycarboxylate superplasticizer with a solid content ...

Embodiment 2

[0034] Weigh 5g 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 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.

Embodiment 3

[0036] Weigh 5g of sodium tripolyphosphate, 10g 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 200g 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 hydrogen peroxide and L-ascorbic acid as an initiation system, and using thioglycolic acid and / or mercaptopropionic acid as a chain transfer agent. According to the present invention, the retarder comprises, by weight, 75-90 parts of the polycarboxylic acid water reducing agent, 1-10 parts of sodium tripolyphosphate, 10-25 parts of citric acid, and 1-10 parts of a calciumincreasing 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] Desulfurization gypsum is industrial waste produced after desulfurization of flue gas in power plants. The annual discharge of desulfurized gypsum in my country is more than 50 million tons, about 40% of which are piled up in large quantities in the form of waste, which covers a large area and causes serious pollution, causing great harm to the climate, soil, plants and human health. imminent. [0003] 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, effectivel...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F222/02C04B24/26C04B103/30C04B103/22
CPCC04B24/2605C04B40/0039C04B2103/22C04B2103/302C08F283/065C08F220/06C08F222/02C04B22/16C04B24/06C04B22/064C04B22/10
Inventor 尹东杰王鹏起何亮谭丹君王莹
Owner BEIJING NEW BUILDING MATERIAL
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