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A kind of hydration control type cement dispersion polymer and preparation method thereof

A polymer and dispersion technology, applied in the field of construction admixtures, can solve problems such as high viscosity, and achieve the effects of poor compactness, cost reduction, and high water-reducing rate

Active Publication Date: 2022-04-22
SHAANXI KZJ NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the problem mentioned in the above background technology that the viscosity of the existing starch-based substances is too high when introduced into the polycarboxylate superplasticizer, the present invention provides a hydration-regulating cement dispersion polymer, the hydration-regulating Type cement dispersion polymer contains:

Method used

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Examples

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preparation example Construction

[0040] The invention provides a method for preparing a hydration-regulated cement dispersion polymer, which specifically comprises the following steps:

[0041]Add the ester group-containing polymer into the reaction kettle, raise the temperature to 60°C, add maltodextrin at the same time, raise the reaction temperature to 90-120°C, and continue to feed nitrogen gas until all the water is distilled, add the catalyst, and pump Vacuum to make it react under a vacuum of 40-80mbar for 2-4 hours. The polymer in the molten state can be sliced, or cooled to below 70°C, and a certain amount of water and sodium hydroxide with a mass concentration of 30% are added. Neutralize to make the pH = 6-7, that is, to prepare a cement-dispersed polymer with a mass concentration of 50% and a molecular weight of 40,000-100,000.

[0042] Wherein, the preparation method of the polymer containing ester group comprises the following steps:

[0043] 1) Add 10-30 parts of unsaturated sulfonate monomer ...

Embodiment 1

[0048] 1) 20g of sodium methallyl sulfonate and 50g of deionized water are added to the reactor;

[0049] 2) When the temperature rises to 35°C, add 15g of hydrogen peroxide aqueous solution A with a mass concentration of 10%, and 20g with a mass concentration of 5% sodium formaldehyde sulfoxylate aqueous solution B. After 10min, add dropwise a mixture of 35g of methyl acrylate, The mixed solution C of 45g 4-vinylbenzoic acid and 30g deionized water is dripped within 120min;

[0050] 3) After the dropwise addition, add 5g of 10% hydrogen peroxide aqueous solution A and drop it within 20 minutes, and ripen for 0.5 hour to obtain a solid content of 45.5%, a viscosity of 400cps and a weight-average molecular weight of 5700. base polymer solution.

[0051] 4) Add 200g of ester group-containing polymer solution into the reaction kettle, raise the temperature to 60°C, add 50g of maltodextrin at the same time, raise the reaction temperature to 120°C, and continue to feed nitrogen ga...

Embodiment 2

[0053] 1) 15g of sodium styrene sulfonate and 50g of deionized water are added to the reactor;

[0054] 2) When the temperature rises to 30°C, add dropwise 25g of potassium persulfate aqueous solution A with a mass concentration of 10%, and 25g of a sodium hypophosphite aqueous solution with a mass concentration of 5%. After 10 minutes, dropwise add 50g of ethyl acrylate, The mixed solution C of 35g 4-vinylphenylacetic acid and 30g deionized water was dripped within 120min;

[0055] 3) after the dropwise addition, add 5g mass concentration of 10% potassium persulfate aqueous solution A and drop it in 20min, and ripen for 0.5 hour to obtain a solid content of 42.6%, a viscosity of 400cps and a weight average molecular weight of 6800 Polymer solutions containing ester groups;

[0056] 4) Add 200g of ester group-containing polymer solution into the reaction kettle, raise the temperature to 60°C, add 30g of maltodextrin at the same time, raise the reaction temperature to 110°C, a...

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Abstract

The present invention relates to the technical field of building admixtures, in particular to a hydration-regulating cement dispersion polymer and a preparation method thereof, wherein the hydration-regulating cement dispersion polymer comprises: a) a polymer containing an ester group, the The ester group-containing polymers comprise polymers or copolymers derived from monomers comprising: 1) unsaturated carboxylate monomers; and 2) unsaturated acid monomers, unsaturated sulfonate monomers at least one of the body; and b) maltodextrin. The hydration-regulating cement dispersion polymer provided by the invention adopts the method of low-temperature copolymerization first and then high-temperature esterification, which reduces the destruction of the double bond of the reaction monomer, improves the degree of copolymerization, and produces a high water-reducing rate of the cement dispersion polymer, which can Improve the workability of concrete and reduce the heat release rate of cement hydration, delay the appearance of the peak temperature of concrete, thereby improving the compactness of concrete and reducing the risk of cracking of concrete, the operation process is simple, and it is conducive to large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of building admixtures, in particular to a hydration-regulating cement dispersion polymer and a preparation method thereof. Background technique [0002] With the continuous promotion of national key engineering projects, as well as the complexity of the structure of the structure and the harsh conditions, it poses a greater challenge to the quality and durability of the concrete structure, and due to the large amount of hydration heat generated by cement hydration , so that the temperature inside the concrete rises, and the heat of hydration accumulates inside the concrete and is not easy to dissipate. When the tensile stress generated by the temperature difference between the inside and outside of the concrete exceeds the compressive strength of the concrete at the initial stage of concrete setting, it will cause cracks in the concrete, which seriously affects the concrete. strength and durability. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02C08F212/14C08F220/14C08F228/02C08F220/18C08F220/58C04B24/38C04B24/16C04B103/40
CPCC08G81/02C08F212/22C08F220/1802C08F220/14C04B24/383C04B24/161C04B2103/408C08F228/02C08F212/30C08F220/585
Inventor 柯余良杨颖刚杨浩张小芳苗东辉
Owner SHAANXI KZJ NEW MATERIALS
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