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Preparation method of polycarboxylic acid grafted slump retaining agent

A technology of slump-retaining agent and polycarboxylic acid, applied in the field of building materials, can solve the problems of difficult to control the slump loss of concrete, lack of slump-retaining agent, etc., and achieve the effect of good slump-retaining performance and performance improvement.

Inactive Publication Date: 2016-06-01
西安优信机电工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, judging from the current situation in our country, although polycarboxylic acid admixtures have obvious advantages, there is still no good slump protection for those concretes that require long-distance transportation or construction operations under high temperature conditions, and the slump loss is difficult to control. agent

Method used

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Examples

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Effect test

preparation example Construction

[0014] A kind of preparation method of polycarboxylate graft slump-retaining agent of the present invention, specifically implement according to the following steps:

[0015] Step 1, measure ethylene glycol, acrylic acid, catalyst p-toluenesulfonic acid, water-carrying agent benzene and polymerization inhibitor hydroquinone according to the volume ratio of 10:3-5:0.5-1:1-2:0.5-1 , put it into a three-neck flask equipped with a water separator, agitator, and a thermometer, and stir rapidly at 60°C to 65°C until no water comes out, steam the benzene, and use 10% NaHCO for the crude product 3 After washing, distill under reduced pressure to obtain the crosslinking agent ethylene glycol diacrylate.

[0016] Step 2, measure allyl polyoxyethylene ether, maleic anhydride, cross-linking agent ethylene glycol diacrylate and deionized water at a volume ratio of 7-10:3:2-3:10, add In a four-necked bottle with a thermometer and an agitator, heat up to 70°C to 75°C. Drop 50% acrylamide s...

Embodiment 1

[0019] A kind of preparation method of polycarboxylate graft slump-retaining agent of the present invention, specifically implement according to the following steps:

[0020] Step 1, measure 20ml of ethylene glycol, 6ml of acrylic acid, 1ml of p-toluenesulfonic acid, 2ml of benzene with water agent and 1ml of hydroquinone as a polymerization inhibitor, and add them to a three-necked bottle equipped with a water separator, agitator and a thermometer. Stir rapidly at 60°C until no water comes out, distill the benzene, and use 10% NaHCO for the crude product 3 After washing, distill under reduced pressure to obtain the crosslinking agent ethylene glycol diacrylate.

[0021] Step 2, measure 14ml of allyl polyoxyethylene ether, 6ml of maleic anhydride, 4ml of crosslinking agent ethylene glycol diacrylate and 20ml of deionized water, add them to a four-necked bottle equipped with a thermometer and a stirrer, and heat up To 70°C, add dropwise 140ml of 50% acrylamide solution and 98m...

Embodiment 2

[0023] A kind of preparation method of polycarboxylate graft slump-retaining agent of the present invention, specifically implement according to the following steps:

[0024] Step 1, measure 20ml of ethylene glycol, 8ml of acrylic acid, 1.5ml of p-toluenesulfonic acid, 3ml of benzene with water agent and 1.5ml of hydroquinone as a polymerization inhibitor, and add them to a three-necked bottle equipped with a water separator, agitator and a thermometer medium, stir rapidly at 63°C until no water comes out, distill the benzene, and use 10% NaHCO for the crude product 3 After washing, distill under reduced pressure to obtain the crosslinking agent ethylene glycol diacrylate.

[0025] Step 2, measure 16ml of allyl polyoxyethylene ether, 6ml of maleic anhydride, 5ml of crosslinking agent ethylene glycol diacrylate and 20ml of deionized water, add them to a four-necked bottle equipped with a thermometer and a stirrer, and heat up To 73°C, drop 140ml of 50% acrylamide solution and ...

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Abstract

The invention discloses a preparation method of a polycarboxylic acid grafted slump retaining agent. The preparation method comprises the following specific steps: adding glycol, acrylic acid, a catalyst, a water carrying agent and a polymerization inhibitor according to a certain ratio into a three-necked bottle, carrying out water separation, carrying out evaporation of benzene, washing, and carrying out reduced pressure distillation to obtain a cross-linking agent; adding allylpolyoxyethylene ether, maleic anhydride, a cross-linking agent ethylene glycol diacrylate and deionized water according to a certain ratio into a four-necked bottle, heating, dropwise adding 50% acrylamide solution and an initiator, carrying out thermal insulation for 0.5-1h after dropwise adding, and adjusting pH value by using 40% NaOH solution so as to obtain a yellow transparent liquid, namely the polycarboxylic acid grafted slump retaining agent with solid content being 30%. The polycarboxylic acid grafted slump retaining agent prepared by the method can endow concrete with good slump retaining performance, and compressive strength is increased with increasing of mixing amount. Meanwhile, performance of fresh concrete can be greatly improved by using the polycarboxylic acid grafted slump retaining agent along with an existing water reducer.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a preparation method of polycarboxylic acid grafted slump retaining agent. Background technique [0002] In today's world, the social economy is booming, and urban construction is advancing by leaps and bounds, followed by the rapid rise of construction related to transportation, hydropower, municipal and other related projects. The market orientation of high standards, high quality, low carbon and environmental protection determines the concrete used in construction. It must keep improving and constantly improve its performance to meet the new needs of the ever-changing urban changes. But for a long time, the use of concrete has been troubled by how to effectively control the slump loss. To this end, experts and scholars in the field of architecture in various countries have done a lot of research work. At present, the methods used to reduce slump loss mainly include:...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F222/06C08F222/14C08F220/56C04B24/26
Inventor 程阴
Owner 西安优信机电工程有限公司
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