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Method for preparing polyester polycarboxylic acid early-strength water reducing agent

A polyester-based polycarboxylic acid and early-strength superplasticizer technology, which is applied in the field of retarding superplasticizers, can solve the problems of not considering the influence of concrete thixotropy, shortening of setting time, and single early-strength method

Inactive Publication Date: 2018-10-02
芜湖恒固混凝土材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the traditional polycarboxylate-based water reducer will delay the hydration of cement, the early strength of concrete will develop slowly, which limits its use in precast concrete and cold climates.
Patent application number 201310346345.8 discloses a high early strength polycarboxylate water reducer and its preparation method. The water reducer is made of methallyl polyoxyethylene ether, acrylamide, sodium methacrylate, Acrylic acid and acrylated alkanolamine and other monomers are polymerized under the action of initiators and chain transfer agents. This water reducer has problems such as single early strength mode, limited shortening of setting time, and no consideration of the impact on concrete thixotropy.

Method used

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  • Method for preparing polyester polycarboxylic acid early-strength water reducing agent
  • Method for preparing polyester polycarboxylic acid early-strength water reducing agent

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preparation example Construction

[0017] The present invention also provides a preparation method of the polyester polycarboxylate early-strength water reducer, the steps are as follows:

[0018] (1) Mixing sepiolite fiber, hexamethylolmelamine hexamethyl ether and pentaerythritol oleate in an aqueous medium at 120-150° C. for 0.5-1 hour to obtain modified sepiolite fiber;

[0019] (2) Mix methallyl alcohol polyoxyethylene ether, mono(meth)acrylate monomer, N-methylolacrylamide and unsaturated acid in a mixed solution of water and glycerin, and then add chain transfer agent, stirred at 70-110°C for 1.5-5h to obtain polyester polycarboxylic acid mother liquor;

[0020] (3) Add nano-titanium dioxide and modified sepiolite fiber to polyester polycarboxylic acid mother liquor, mix thoroughly, then add alkyl organic amine, sodium nitrite, defoamer, mix evenly, and obtain polyester polycarboxylate Carboxylic acid early strength superplasticizer.

[0021] The invention uses methallyl alcohol polyoxyethylene ether, ...

Embodiment 1

[0023] (1) Mix 2 g of sepiolite fiber, 1.5 g of hexamethylolmelamine hexamethyl ether and 1 g of pentaerythritol oleate in water for 1 hour at 125° C., centrifugally wash and dry to obtain modified sepiolite fiber;

[0024] (2) 60g methallyl alcohol polyoxyethylene ether, 25g polyethylene glycol polytetramethylene glycol mono(meth)acrylate, 5g N-methylolacrylamide and 1.5g maleic acid in 100g water and 25g Mix evenly in the mixed solution of glycerin, then add 0.5g of mercaptoacetic acid, and stir at 80°C for 2.5h to obtain a polyester polycarboxylic acid mother liquor;

[0025] (3) Mix 5 g of nano-silica and silane coupling agent KH550 in toluene evenly, and then reflux at 100° C. for 8 hours to obtain amino-modified silica with a surface amino content of 0.45 mmol / g;

[0026] (4) Add amino-modified silica and modified sepiolite fiber to the polyester polycarboxylic acid mother liquor, mix well, then add 6g triisopropanolamine, 15g sodium nitrite, 0.5g organosilicon disinfect...

Embodiment 2

[0028] (1) Mix 1g of sepiolite fiber, 1g of hexamethylolmelamine hexamethyl ether and 2g of pentaerythritol oleate in an aqueous medium at 150°C for 0.5h, centrifuge, wash and dry to obtain modified sepiolite fiber;

[0029] (2) Mix 20g methallyl alcohol polyoxyethylene ether, 28g propoxypolyethylene glycol polypropylene glycol mono(meth)acrylate, 6g N-methylolacrylamide and 1g maleic acid in water and 30g Mix evenly in the mixed solution of glycerin, then add 0.2g of mercaptoethanol, and stir at 110°C for 1.5h to obtain a polyester polycarboxylic acid mother liquor;

[0030](3) Mix 6 g of nano-silica and silane coupling agent KH550 in toluene evenly, and then reflux at 100° C. for 8 hours to obtain amino-modified silica with a surface amino content of 0.45 mmol / g;

[0031] (4) Add amino-modified silica and modified sepiolite fiber to polyester polycarboxylic acid mother liquor, mix well, then add 10g triethanolamine, 12g sodium nitrite, 1g polyether modified silicon defoamin...

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Abstract

The invention relates to the technical field of early-strength water reducing agent, in particular to a method for preparing a polyester polycarboxylic acid early-strength water reducing agent. The method comprises the following steps: (1) uniformly mixing methyl allyl alcohol polyoxyethylene ether, a mono(methyl)acrylate monomer, N-hydroxymethyl acrylamide and unsaturated acid with a mixed solution of water and glycerinum, adding a chain transferring agent, and stirring for 1.5-5 hours at 70-110 DEG C, so as to obtain a polyester type polycarboxylic acid mother liquid; (2) putting nano titanium dioxide and a modified sepiolite fiber into the polyester type polycarboxylic acid mother liquid, sufficiently mixing, further adding alkyl organic amine, sodium nitrite and a defoaming agent, anduniformly mixing, thereby obtaining the polyester polycarboxylic acid early-strength water reducing agent. By adopting the early-strength water reducing agent, the gas content of the concrete is greatly reduced, the initial setting time and the final setting time of the concrete are shortened, and the durability can be improved.

Description

technical field [0001] The invention relates to the technical field of retarding water reducing agents, in particular to a preparation method of polyester polycarboxylate early strength water reducing agents. Background technique [0002] Water reducing agent is an admixture that can reduce water consumption under the condition that the concrete slump is basically the same. In order to shorten the construction period, adding enhanced water reducer to concrete can not only improve the performance of concrete but also increase the early strength of concrete. Water reducers are divided into two types: organic and inorganic. Organic water reducers are in the category of water surface active agents. They have a better water reducing effect and can well reduce the interfacial energy between water, gas and solid, and play a role in lubrication and dispersion. However, it is weak to change the hydration reaction process of cement concrete; the inorganic water reducing agent mainly ...

Claims

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Application Information

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IPC IPC(8): C04B24/28C08F283/06C08F220/58C08F222/02C04B103/30
CPCC04B40/0039C04B2103/302C08F283/065C08F220/58C04B24/283C04B14/4643C04B24/121C04B22/085C04B2103/50
Inventor 承忠富
Owner 芜湖恒固混凝土材料有限公司