Polycarboxyliy water reducer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, applied in the field of polycarboxylate water reducing agent and its preparation, can solve the problem that shrinkage reduction performance and water reduction performance cannot be taken into account at the same time, achieve easy control of reaction conditions, enhance impact resistance, Simple production process

Inactive Publication Date: 2017-02-08
ANHUI XIN SOLID ENVIRONMENTAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, polycarboxylate water reducers such as CN103193410A, CN104262545A, CN105622863A, etc. have the problem that the shrinkage reduction performance and the water reduction performance cannot be taken into account at the same time

Method used

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  • Polycarboxyliy water reducer and preparation method thereof
  • Polycarboxyliy water reducer and preparation method thereof
  • Polycarboxyliy water reducer and preparation method thereof

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preparation example Construction

[0034] The present invention provides a method for preparing a water reducer with a structure represented by formula I described in the above technical solution, comprising the following steps:

[0035] In the presence of an initiator and a molecular weight regulator, polyoxyethylene ether, acrylate, allyl alcohol, acrylic acid and allyl sulfonate are subjected to a copolymerization reaction in water to obtain a water reducer with the structure shown in formula I.

[0036] In the present invention, the mass ratio of polyoxyethylene ether, acrylate, allyl alcohol, acrylic acid, and allyl sulfonate is preferably (270-380): (2-15): (3-9): (20~60): (1~9), more preferably (300~360): (4~12): (4~8): (30~50): (3~8), most preferably (320 ~350): (6~9): (5~7): (35~45): (4~6).

[0037] In the present invention, the mass ratio of the polyoxyethylene ether, initiator, molecular weight regulator and water is preferably (270-380): (1-8): (1-7): (580-660), more preferably Preferably (300~360...

Embodiment 1

[0052] The raw material is calculated in parts by mass, and its preparation method comprises the steps:

[0053] Under normal temperature conditions, add 270 parts of isobutylene alcohol polyoxyethylene ether polyoxyethylene ether with a number average molecular weight of 2699, 2 parts of propyl acrylate, 3 parts of allyl alcohol, and 580 parts of water into the reactor, stir and dissolve, and respectively Add dropwise 20 parts of acrylic acid, 1 part of sodium allyl sulfonate, 1 part of hydrogen peroxide and ascorbic acid, and 1 part of 3-mercaptopropionic acid molecular weight regulator, and carry out free radical copolymerization at 20 ° C for 3 hours. Insulate at 20° C. for 1 hour to obtain a polycarboxylate water reducer with the structure shown in formula I.

[0054] figure 1 The infrared spectrogram of the polycarboxylate water-reducer with structure shown in formula I that embodiment 1 makes, as can be seen from the figure, at 3424cm -1 There is an absorption peak on...

Embodiment 2

[0057] The raw material is calculated in parts by mass, and its preparation method comprises the steps:

[0058] Under normal temperature conditions, add 380 parts of isopentenol polyoxyethylene ether polyoxyethylene ether with a number average molecular weight of 3100, 15 parts of ethyl acrylate, 9 parts of allyl alcohol, and 660 parts of water into the reactor, and stir to dissolve , add dropwise 60 parts of acrylic acid, 9 parts of allyl potassium sulfonate, 8 parts of hydrogen peroxide and ascorbic acid, and 7 parts of azobisisobutyronitrile molecular weight regulator, and carry out free radical copolymerization at 35 ° C for 10 h , after completion, keep it warm at 35° C. for 5 hours to obtain a polycarboxylate water reducer with the structure shown in formula I.

[0059] According to the relevant standards of cement concrete, the polycarboxylate water reducer with the structure shown in formula I prepared in Example 2 was tested for relevant performance, and the results ...

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Abstract

The invention provides a polycarboxyliy water reducer and belongs to the technical field of concrete water reducers. According to the technical scheme of the invention, not only the polycarboxyliy water reducer is provided with high-performance water-reducing type carboxyls, sulfonic acid groups, poly(ethylene oxide)graft chains and other groups, but also acrylic esters, allyl alcohols and other small monomers, having the reduction function, are grafted onto the polycarboxyliy water reducer. Therefore, the polycarboxyliy water reducer is high in water-reducing rate and crack resistance, and good in reduction effect at the same time. The shrinkage stress of the concrete during different periods of the formation process is avoided, so that the generation and development of cracks is avoided. The impact resistance of the concrete/mortar is significantly enhanced. The polycarboxyliy water reducer can be applied to the engineering fields of waterproof projects, highways, ports, tunnels, reservoir dams, special impervious and antiknock projects and the like. Especially, the polycarboxyliy water reducer is especially applicable to the seamless design and the construction of expansive concretes, mass concretes and super-length reinforced concretes. Therefore, the polycarboxyliy water reducer has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of concrete water reducers, in particular to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete is a commonly used material in bridges, roads, construction and other projects. With the rapid development of construction industry and water conservancy projects, higher requirements are put forward for the performance of concrete. Adding water reducing agent is one of the means to improve the performance of concrete. The development of water reducing agent has a long history. From the early lignosulfonate to the successful development of β-naphthalenesulfonic acid formaldehyde condensate sodium salt (SNF) and sulfonated melamine formaldehyde condensate (SMF) in the 1960s, two high-efficiency water reducers , so that the development of concrete technology rose to a stage. Since the mid-1980s, a new generation of polymer water reducers has been developed, su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/18C08F216/08C08F220/06C08F228/02C04B24/16C04B103/30
CPCC04B24/165C08F283/065C04B2103/30C08F220/1803C08F220/1802C08F216/08C08F220/1804
Inventor 刘景相马丽涛
Owner ANHUI XIN SOLID ENVIRONMENTAL CO LTD
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