CN111943563A

CN111943563A - High-performance compound cement retarder and preparation method thereof

Info

Publication number: CN111943563A
Application number: CN201910402372.XA
Authority: CN
Inventors: 董秋霞; 谢璞
Original assignee: Nanjing Tengheng New Materials Co ltd
Current assignee: Nanjing Tengheng New Materials Co ltd
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2020-11-17

Abstract

The invention discloses a high-performance compound cement retarder and a preparation method thereof, wherein a silane coupling agent, an organic solvent and deionized water are added into a reaction kettle to form a hydrolysis system of the silane coupling agent, hydrolysis reaction of the silane coupling agent is carried out at the temperature of 40-120 ℃ to obtain silane coupling agent hydrolysate, and a cationic surfactant, glucose, deionized water and the silane coupling agent hydrolysate are added into a stirring kettle and stirred to be homogeneous, so that the high-performance cement retarder can be prepared. The cement retarder has excellent retarding effect, is low in mixing amount, has a certain grinding aiding effect on cement, and can improve early and later strength of the cement.

Description

High-performance compound cement retarder and preparation method thereof

Technical Field

The invention relates to the technical field of cement additives, in particular to a high-performance compound cement retarder and a preparation method thereof.

Background

Because the road construction process is complex and the time is long, in order to ensure the construction operation time and the base quality, a cement retarder is required to be applied in the road construction process. In current practical applications, cement retarders are mainly classified into the following categories: monohydric alcohols such as methanol, ethanol and the like have short retardation time and cannot meet the operation requirement of road construction; polyhydric alcohols such as ethylene glycol, glycerol and the like have good retardation effect, but the mixing amount is high and is generally 0.1-0.5%; sugars such as glucose, sucrose, etc., which have both retarding and thickening effects; carboxylic acids such as citric acid, tartaric acid, salicylic acid and the like have the effects of retarding coagulation and inhibiting slump loss, but have a certain crumpling effect on the early strength of concrete and mortar; the hydroxyl/amino carboxylate such as sodium gluconate, the mixing amount of which is generally between 0.02 and 0.15 percent, has good retarding effect and water reducing effect, and is not beneficial to the later preparation of concrete; phosphate/phosphogypsum, which is generally used as an additive in solid form, is added in a large amount and is not beneficial to transportation and cement production. There are currently some cement retarders reported: the invention patent with the application number of CN201610480811.5 and the name of retarding cement grinding aid uses triethanolamine, diethanol monoisopropanolamine, sodium tartrate, coconut diethanolamide, sodium gluconate, polyaspartic acid and water to prepare the retarding cement grinding aid, and has good retarding effect. The retarder prepared by the method has high cost and is not beneficial to popularization. The invention patent with the application number of CN201810629761.1 and the name of cement retarder, the preparation method and the application thereof uses phosphogypsum, desulfurized fly ash, mineral powder and limestone powder to prepare the solid cement retarder, effectively provides a comprehensive treatment scheme of the phosphogypsum and the desulfurized fly ash, and the prepared retarder has good retarding effect, but the method requires the mineral powder with higher specific surface area to be used, and the mixing amount of the solid retarder is larger, thereby being not beneficial to industrial production.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a high-performance compound cement retarder and a preparation method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

a high-performance compound cement retarder and a preparation method thereof are characterized by comprising the following components: cationic surfactant, silane coupling agent, glacial acetic acid, glucose, organic solvent and deionized water.

Preferably, the mass fractions of the components are as follows: cationic surfactant: 5% -15%; silane coupling agent: 2% -5%; glacial acetic acid: 2% -8%; organic solvent: 5% -25%; glucose: 15% -60%; deionized water: 10 to 70 percent.

Preferably, the cationic surfactant comprises one or more of an amine salt type cationic surfactant, a quaternary ammonium salt type cationic surfactant and a heterocyclic type cationic surfactant.

Preferably, the silane coupling agent comprises one or more of aminopropyltriethoxysilane (KH550), glycidoxypropyltrimethoxysilane (KH560), methacryloxypropyltrimethoxysilane (KH570), mercaptopropyltrimethoxysilane (KH580), mercaptopropyltriethoxysilane (KH590), ethylenediamine propyltriethoxysilane (KH792), ethylenediamine propylmethyldimethoxysilane (KBM602), vinyltriethoxysilane (A151), and vinyltrimethoxysilane (A171).

Preferably, the organic solvent is methanol, ethanol, isopropanol, allyl alcohol, ethylene glycol, diethylene glycol or glycerol.

Preferably, the pH value range of the high-performance compound cement retarder is 2-7.

Preferably, the high-performance compound cement retarder can be applied to portland cement, ordinary portland cement, portland slag cement, pozzolanic portland cement and portland fly ash cement.

Preferably, the method comprises the following process steps:

(1) adding a silane coupling agent, an organic solvent and deionized water into a reaction kettle to form a hydrolysis system of the silane coupling agent, wherein the mass ratio of the silane coupling agent to the organic solvent is 0.1-1.0, and the mass ratio of the silane coupling agent to the deionized water is 0.1-1.0.

(2) And carrying out hydrolysis reaction of the silane coupling agent at the temperature of 40-120 ℃, wherein the hydrolysis time is 0.5-4 h.

(3) And after the hydrolysis reaction of the silane coupling agent is finished, adding glacial acetic acid to adjust the pH of the hydrolysate to 3-6, thus obtaining the silane coupling agent hydrolysate.

(4) And (3) adding the cationic surfactant, glucose and deionized water into a stirring kettle according to corresponding mass percent, stirring to a homogeneous phase, adding the silane coupling agent hydrolysate in the step (3), and stirring for 0.5-3 h to prepare the high-performance cement retarder.

Preferably, the mixing amount of the high-performance compound cement retarder is 0.01-1% of the mass of the cement. .

The invention has the beneficial effects that:

the invention has the following advantages: the preparation process is simple, green and environment-friendly; the prepared retarder has less mixing amount and obvious retarding effect, and is favorable for improving the early and later strength of cement.

The silane coupling agent can form bonding on the surface of an inorganic substance, the cationic surfactant can be adsorbed on the surface of a solid in an electrostatic action mode, and the silane coupling agent and the cationic surfactant have a synergistic effect to block the hydration process of cement, so that the setting time of the cement is prolonged

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.

A high-performance compound cement retarder and a preparation method thereof comprise the following components: cationic surfactant, silane coupling agent, glacial acetic acid, glucose, organic solvent and deionized water.

The preparation method of the high-performance compound cement retarder comprises the following process steps:

Preferably, the organic solvent is methanol, ethanol, isopropanol, allyl alcohol, formaldehyde, acetaldehyde, ethylene glycol, diethylene glycol, and glycerol.

Preferably, the mixing amount of the high-performance compound cement retarder is 0.01-1% of the mass of the cement.

Implementation scheme one

The preparation method of the high-performance compound cement retarder comprises the following process steps of (1) adding 50 parts of silane coupling agent KH570, 50 parts of isopropanol and 150 parts of water into a reaction kettle, carrying out hydrolysis reaction on the silane coupling agent at 80 ℃, wherein the hydrolysis time is 40min, and adding glacial acetic acid to adjust the pH value of hydrolysate to 3-6 to obtain silane coupling agent hydrolysate. Adding 80 parts of dodecyl trimethyl ammonium bromide, 500 parts of glucose and 165 parts of deionized water into a stirring kettle, stirring to be homogeneous, adding silane coupling agent hydrolysate, and stirring for 30min to prepare the high-performance cement retarder A.

(2) The high-performance cement retarder A is doped into the ordinary portland cement by 0.05 percent of the mass of the cement, compared with the ordinary commercially available cement retarder, the high-performance cement retarder A has the advantages of reduced doping amount, better retarding effect and contribution to improving the early and later strength of the cement. See table 1 for specific effects.

TABLE 1

Example two

The preparation method of the high-performance compound cement retarder comprises the following process steps

(1) Adding 50 parts of silane coupling agent KH570, 50 parts of isopropanol and 150 parts of water into a reaction kettle, carrying out hydrolysis reaction on the silane coupling agent at 80 ℃, wherein the hydrolysis time is 40min, and adding glacial acetic acid to adjust the pH value of the hydrolysate to 3-6 to obtain the silane coupling agent hydrolysate. Adding 50 parts of N-methyl-N-decaalkyl amino ethyl trimethyl ammonium bromide, 500 parts of glucose and 195 parts of deionized water into a stirring kettle, stirring to be homogeneous, adding silane coupling agent hydrolysate, and stirring for 30min to prepare the high-performance cement retarder B.

(2) The high-performance cement retarder B is doped into the portland slag cement in an amount which is 0.04% of the mass of the cement, compared with the common cement retarder sold in the market, the high-performance cement retarder B has the advantages of reduced doping amount, better retarding effect and contribution to improving the early and later strength of the cement. See table 2 for specific effects.

TABLE 2

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A high-performance compound cement retarder and a preparation method thereof are characterized by comprising the following components: cationic surfactant, silane coupling agent, glacial acetic acid, glucose, organic solvent and deionized water.

2. The high-performance compound cement retarder according to claim 1, characterized in that the mass fractions of the components are as follows: cationic surfactant: 5% -15%; silane coupling agent: 2% -5%; glacial acetic acid: 2% -8%; organic solvent: 5% -25%; glucose: 15% -60%; deionized water: 10% -70%.

3. The high performance compound cement retarder according to claim 1, wherein the cationic surfactant comprises one or more of an amine salt type cationic surfactant, a quaternary ammonium salt type cationic surfactant and a heterocyclic type cationic surfactant.

4. The high performance compounded cement retarder according to claim 1, wherein the silane coupling agent comprises one or more of aminopropyltriethoxysilane (KH550), glycidoxypropyltrimethoxysilane (KH560), methacryloxypropyltrimethoxysilane (KH570), mercaptopropyltrimethoxysilane (KH580), mercaptopropyltriethoxysilane (KH590), ethylenediamine propyltriethoxysilane (KH792), ethylenediamine propylmethyldimethoxysilane (KBM602), vinyltriethoxysilane (A151), and vinyltrimethoxysilane (A171).

5. The high performance compound cement retarder of claim 1, wherein the organic solvent is methanol, ethanol, isopropanol, propylene glycol, ethylene glycol, diethylene glycol, or glycerol.

6. The high-performance compound cement retarder according to claim 1, wherein the pH value of the high-performance compound cement retarder is 2-7.

7. The high performance compound cement retarder according to claim 1, wherein the high performance compound cement retarder can be applied to portland cement, ordinary portland cement, portland slag cement, portland pozzolan cement, and portland fly ash cement.

8. The preparation method of the high-performance compound cement retarder according to claim 1, characterized by comprising the following process steps:

(1) adding a silane coupling agent, an organic solvent and deionized water into a reaction kettle to form a hydrolysis system of the silane coupling agent, wherein the mass ratio of the silane coupling agent to the organic solvent is 0.1-1.0, and the mass ratio of the silane coupling agent to the deionized water is 0.1-1.0;

(2) carrying out hydrolysis reaction of the silane coupling agent at the temperature of 40-120 ℃, wherein the hydrolysis time is 0.5-4 h;

(3) after the hydrolysis reaction of the silane coupling agent is finished, adding glacial acetic acid to adjust the pH of the hydrolysate to 3-6, and obtaining silane coupling agent hydrolysate;

9. The high-performance compound cement retarder according to claim 1, wherein the mixing amount of the high-performance compound cement retarder is 0.01-1% of the mass of cement.