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Novel polycarboxylic acid type cement additive and synthesis method thereof

A technology of cement admixture and polycarboxylic acid, which is applied in the field of new polycarboxylic acid type cement admixture and its synthesis, can solve the problem of low molecular weight distribution, and achieves difficult hydrolysis, stable product performance, excellent water reduction and plasticity retention. Effect

Active Publication Date: 2015-04-22
北京厚德交通科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been a large number of literatures on the influence of monomer types, ratios, polymerization conditions, etc. on the molecular structure and performance of polycarboxylic acid admixtures, but there are few reports on the influence of monomer molecular weight distribution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Harmonize the large monomer:

[0030] Stir and mix 50g of prenyl polyoxyethylene ether with a molecular weight of 500 and 250g of a molecular weight of 2200.

[0031] (2) Deploying polymerization additives:

[0032] Mix and dissolve 1.75g ​​ammonium persulfate, 1.6g mercaptopropionic acid, 20g acrylic acid, and 100g deionized water evenly.

[0033] (3) Aggregation:

[0034] Add 150 g of deionized water into the reaction kettle, then stir and heat up to 60°C. After the temperature is constant, the polymerization additive is added to the reactor at a constant speed by a drop-adding system composed of a pump and a flow meter. The dropwise addition was completed within 3h. After the dropwise addition was completed, the reaction was maintained for 1 h. Then cool down to stop the reaction.

[0035] (4) Post-processing:

[0036] After the reaction was completed, the solution in the reactor was neutralized to pH=7 with 30% sodium hydroxide solution.

[0037] (5) Det...

Embodiment 2

[0043] (1) Blending the macromonomer: Stir and mix 50 g of prenol-based polyoxyethylene ether with a molecular weight of 800 and 250 g of a molecular weight of 2200.

[0044] (2) Deploying polymerization additives:

[0045] Mix and dissolve 2.0g potassium persulfate, 1.8g mercaptoethanol, 45g methacrylic acid, and 100g deionized water evenly.

[0046] (3) Aggregation:

[0047] Add 150 g of deionized water into the reaction kettle, then stir and heat up to 60°C. After the temperature is constant, the polymerization additive is added to the reactor at a constant speed by a drop-adding system composed of a pump and a flow meter. The dropwise addition was completed within 3h. After the dropwise addition was completed, the reaction was maintained for 1 h. Then cool down to stop the reaction.

[0048] (4) Post-processing:

[0049] After the reaction was completed, the solution in the reactor was neutralized to pH=7 with 30% sodium hydroxide solution.

[0050] (5) Determinatio...

Embodiment 3

[0053] (1) Harmonize the large monomer:

[0054] Stir and mix 50g of prenyl polyoxyethylene ether with a molecular weight of 500 and 250g of a molecular weight of 3000.

[0055] (2) Deploying polymerization additives:

[0056] A mixture of 3.0g hydrogen peroxide (30wt%) / 0.1g vitamin E, 1.8g mercaptoacetic acid, 45g acrylic acid and 100g deionized water were mixed and dissolved evenly.

[0057] (3) Aggregation:

[0058] Add 150 g of deionized water into the reaction kettle, then stir and heat up to 40°C. After the temperature is constant, the polymerization additive is added to the reactor at a constant speed by a drop-adding system composed of a pump and a flow meter. The dropwise addition was completed within 3h. After the dropwise addition was completed, the reaction was maintained for 1 h. Then cool down to stop the reaction.

[0059] (4) Post-processing:

[0060] After the reaction was completed, the solution in the reactor was neutralized to pH=7 with 30% sodium hydr...

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Abstract

The invention provides a novel polycarboxylic acid type cement additive. The novel polycarboxylic acid type cement additive is formed by copolymerization of macromonomers containing polyoxyethylene ether groups and polymerization additives. The macromonomers contain the polyoxyethylene ether groups, and the molecular weight of the macromonomers is within 500-3000. The polymerization additives comprise comonomers, initiators, molecular weight modifiers and deionized water. The invention further provides a synthesis method of the novel polycarboxylic acid type cement additive. The method includes the steps of firstly, conditioning the macromonomers; secondly, blending the polymerization additives; thirdly, performing polymerization; fourthly, performing postprocessing. According to the novel polycarboxylic acid type cement additive, macromonomers with different molecular weights are mixed to obtain the macromonomers with wide molecular weight distribution to combine with proper polymerization technologies, and therefore the synthesized polymer can be better dispersed and extended structurally; accordingly, functions of all units in the polymer can be developed to the maximum degree, and the novel polycarboxylic acid type cement additive is excellent in performance especially in plasticity-maintaining performance and water reducing performance.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a novel polycarboxylate cement admixture used for mixing cement, mortar and concrete and a synthesis method thereof. Background technique [0002] Cement is one of the main building materials currently used. With the development of my country's economy and the improvement of industrial level, the requirements for its performance are getting higher and higher. The performance of cement can be effectively improved by adding suitable admixtures, so as to meet the needs of construction in many fields such as roads and bridges, high-rise buildings, dams and power stations. Polycarboxylate cement admixture is an important cement admixture widely used at present. For example, polycarboxylate-based water-reducers have higher water-reducing efficiency than naphthalene-based water-reducers, and at the same time make up for the shortcomings of naphthalene-based water-reducers in the rapid lo...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F220/58C08F222/02C08F222/06C04B24/26C04B24/16C04B103/44
Inventor 刘小龙胡影刘丙振崔雅歌刘小凤王慧崔建平
Owner 北京厚德交通科技股份有限公司
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