A mud-resistant polycarboxylate water reducer, its preparation method and use method

A technology of polycarboxylate and water reducer, which is applied in the field of mud-resistant polycarboxylate water reducer, which can solve the problems of high sensitivity to aggregate mud content, reduced strength of hardened concrete, and reduced water-reducing and dispersing ability. , to achieve the effects of avoiding adverse effects, convenient operation, and low raw material cost

Active Publication Date: 2017-09-19
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the high sensitivity of the existing polycarboxylate water reducer to aggregate mud content, resulting in a serious decline in the water reducing and dispersing ability of the existing polycarboxylate water reducer, Poor slump-preserving effect leads to defects such as reduced strength of hardened concrete, and a mud-resistant polycarboxylate water reducer, its preparation method and use method are provided

Method used

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  • A mud-resistant polycarboxylate water reducer, its preparation method and use method
  • A mud-resistant polycarboxylate water reducer, its preparation method and use method

Examples

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Embodiment 1

[0029] Accurately weigh 155 parts by weight of water for use in the following steps;

[0030] a: Preparation of Solution A

[0031] Accurately weigh 9 parts by weight of acrylic acid, 6 parts by weight of hydroxypropyl acrylate, 2 parts by weight of methyl acrylate, 2 parts by weight of aminotrimethylene phosphonic acid, 2 parts by weight of maleic anhydride, 1.25 parts by weight of sodium methacrylate and 44 parts by weight of water, stirred and mixed evenly, pumped into the high-level tank A, ready to add dropwise;

[0032] b: Preparation of Solution B

[0033] Accurately weigh 0.6 parts by weight of mercaptoacetic acid, 0.4 parts by weight of mercaptopropionic acid and 56 parts by weight of water, stir and mix evenly, pump into the high level tank B, and prepare dropwise;

[0034] c: Preparation of Solution C

[0035] Accurately weigh 100 parts by weight of isopentenol polyoxyethylene ether (DD-524) with a number average molecular weight of 1200, 1.5 parts by weight of a...

Embodiment 2～ Embodiment 5

[0039] According to the method and steps of Example 1, the anti-mud type polycarboxylate superplasticizer of the present invention was prepared according to the formula in Table 1. According to the addition amount shown in Table 1, the anti-mud type polycarboxylate water-reducer obtained in Examples 1-5 (abbreviated as S1-S5) of the present invention was added to cement slurry and concrete with different mud contents, and the obtained cement The performance data of paste and concrete are also shown in Table 1.

[0040] Among them, the commercially available mud-resistant polycarboxylate superplasticizer was purchased from Wuhan Jincarbox Technology Co., Ltd., the model is JS-900, referred to as D1.

[0041] Among them, the type of cement used in cement slurry and concrete in Table 1 is P.O.42.5, and the manufacturer is Shanghai Jinshan Cement Factory.

[0042] Among them, the slurry test is carried out according to the standard of GB / T 8077-2000 "Concrete Admixture Homogeneit...

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Abstract

The invention discloses a mud-resistant polycarboxylate water reducer, a preparation method and a use method thereof. The anti-mud type polycarboxylate water reducer is made of the following raw materials: 100 parts of isopentenol polyoxyethylene ether, 9 to 13 parts of monomer A, 0 to 6 parts of monomer B, 0 parts of monomer C ~4 parts, 0~2 parts of amino trimethylene phosphonic acid, 1~3 parts of maleic anhydride, 1~2 parts of monomer D, 1~2 parts of initiator, 0~1 part of sodium hypophosphite, 0.4 parts of chain transfer agent ~1.6 parts, 3~7 parts of pH regulator and 140~160 parts of water. The anti-mud type polycarboxylate water reducer prepared by the preparation method of the present invention can be used when the aggregate mud content is high, avoiding the adverse effect of the aggregate mud content on the polycarboxylate water reducer in ready-mixed concrete. Impact; raw material cost is low, performance is good; at the same time, the preparation method and use method of the anti-mud type polycarboxylate superplasticizer of the present invention, the process is simple, the operation is convenient, and the application range is wide.

Description

technical field [0001] The invention relates to a mud-resistant polycarboxylate water reducer, a preparation method and a use method thereof. Background technique [0002] Concrete water reducer is the most important additive in the concrete industry, and its development history can be divided into three generations: the first generation of water reducer (1930s): lignosulfonate and sodium rosinate, stearic acid soap class and other water reducing agents. Its water reducing rate is low, and it has a certain retarding and air-entraining effect. Excessive dosage will seriously affect the performance of concrete. The second generation of water reducer (1960s): naphthalene, melamine and other water reducers. It has high water-reducing rate, no air-entrainment, no retardation, and good reinforcement effect. Excessive dosage has little effect on concrete performance. , melamine and other raw materials are harmful to human body and environment. The third generation of water redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B103/30
Inventor 徐军李亚杰罗琼杜辉王振波董建国
Owner SHANGHAI DONGDA CHEM
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