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Preparation method of novel phosphate group-containing melamine-formaldehyde oligomer type migratory steel bar corrosion inhibitor

A technology of steel rust inhibitor and melamine, which is applied in the field of preparation of melamine-formaldehyde oligomer-type migratory steel rust inhibitor, can solve the problem of the surrounding environment and human health harmful industrial waste gas, and the limited source of raw materials for migratory rust inhibitors , expensive materials and other issues, to achieve the effect of improving long-term resistance to chloride ion erosion, good protection, and low price

Active Publication Date: 2020-06-05
JINLING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw materials for the preparation of traditional migratory rust inhibitors are imidazole, pyrimidine, pyridine, five-membered or six-membered heterocyclic synthetic chemicals, which lead to limited sources of raw materials for migratory rust inhibitors and expensive materials
More importantly, the production process of this migratory rust inhibitor is complicated, and industrial waste gas harmful to the surrounding environment and human health will be generated during production, which hinders the application of this migratory rust inhibitor in reinforced concrete materials. widely used

Method used

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  • Preparation method of novel phosphate group-containing melamine-formaldehyde oligomer type migratory steel bar corrosion inhibitor
  • Preparation method of novel phosphate group-containing melamine-formaldehyde oligomer type migratory steel bar corrosion inhibitor
  • Preparation method of novel phosphate group-containing melamine-formaldehyde oligomer type migratory steel bar corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1.1. Preparation of melamine solution

[0044] Weigh 400kg of solid melamine and 550kg of water and put it into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel and a reflux condenser. The mixture was continuously stirred to make melamine completely dissolved in water to form a homogeneous and clear solution, and then acetic acid with a concentration of 36% by weight was added to adjust the pH of the solution to 2.

[0045] 1.2. Preparation of phosphoric acid-containing melamine monomers

[0046] 145kg of white crystalline phosphoric acid was dissolved in 218kg of water to form a phosphoric acid solution with a concentration of 40% by weight. Slowly add 363kg phosphoric acid solution dropwise to the melamine solution of 517kg, keep stirring the solution, control the temperature of the system not to exceed 50°C, add about 60min, raise the mixed solution temperature to 75°C after adding, and react at this temperature for 2 hours, Finally, a ho...

Embodiment 2

[0052] 1.1. Preparation of melamine solution

[0053] Weigh 450kg of solid melamine and 600kg of water and put them into a reaction vessel equipped with a stirrer, a thermometer, a dropping funnel and a reflux condenser. The mixture was continuously stirred to make melamine completely dissolved in water to form a homogeneous and clear solution, and then acetic acid with a concentration of 38% by weight was added to adjust the pH of the solution to 3.

[0054] 1.2. Preparation of phosphoric acid-containing melamine monomers

[0055] Dissolve 146 kg of white crystalline phosphoric acid in 220 kg of water to form a phosphoric acid solution with a concentration of 40% by weight. Slowly add 366kg phosphoric acid solution dropwise to the melamine solution of 519kg, keep stirring the solution, control the temperature of the system not to exceed 50 ° C, add about 90 min, increase the temperature of the mixed solution to 80 ° C after adding, and react at this temperature for 3 hours, ...

experiment example 1

[0061] Determination of rust-inhibiting effect of simulated concrete hole solution of phosphoric acid group-containing melamine-formaldehyde oligomer type migratory steel bar rust inhibitor with different dosages

[0062] 2.1. Preparation of steel bar samples

[0063] Referring to the test method of ASTM G3172, the diameter of Φ6mm and the length of 100mm is used to process the Q235 round steel bar for construction into a steel bar with a diameter of Φ6mm and a length of about 90mm, and the surface of the steel bar is removed by grinding with 100-1000 mesh SiC water sandpaper and 200 mesh metallographic sandpaper. After the oxide skin, it becomes a steel bar with a smooth surface for use.

[0064]2.2. To study the rust-inhibiting effect of the phosphoric acid group-containing melamine-formaldehyde oligomer type migratory steel bar rust inhibitor in the simulated concrete pore solution. The simulated concrete pore solution used in this study was 3.0% NaCl and (saturated Ca(OH)...

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Abstract

The invention provides a preparation method of a novel phosphate group-containing melamine-formaldehyde oligomer type migratory steel bar corrosion inhibitor. The preparation method comprises the following steps: firstly, modifying melamine into a melamine monomer containing hydroxymethyl and phosphate groups by utilizing amino groups on melamine; and carrying out intramolecular dehydration on melamine molecules containing hydroxymethyl and phosphate groups to obtain the straight-chain melamine-formaldehyde oligomer type migratory steel bar corrosion inhibitor. The melamine is used for preparing the migratory steel bar corrosion inhibitor, and the molecular configuration and molecular weight of the steel bar corrosion inhibitor can be adjusted to meet the requirements of different ocean engineering. The application field of melamine monomers is widened, and the production cost of the migratory steel bar corrosion inhibitor is reduced. Meanwhile, the problems that the process for preparing the steel bar corrosion inhibitor from imidazole, pyrimidine, pyridine, five-membered and six-membered heterocyclic chemicals is complex, and highly toxic waste gas is generated in the productionprocess are solved. The prepared migratory corrosion inhibitor has a good corrosion inhibition effect on reinforcing steel bars, realizes the high performance of the reinforcing steel bar corrosion inhibitor, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of building material preparation, and in particular relates to a preparation method of a novel phosphoric acid group-containing melamine-formaldehyde oligomer type migratory steel bar rust inhibitor. Background technique [0002] It is well known that the ocean covers 71% of the total area of ​​the entire earth. In recent years, with the increasing awareness of the ocean in countries around the world, the number of new marine structures such as coastal railways, cross-sea bridges, submarine tunnels, deep-sea ports and wharves, offshore oil platforms, and artificial islands has continued to increase. play an increasingly important role. Generally speaking, marine structures adopt reinforced concrete structures, and the construction cost and investment are huge, which puts forward high requirements on the durability of reinforced concrete structures. Generally, the service life of ordinary marine structures ...

Claims

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Application Information

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IPC IPC(8): C08G12/32C04B24/30C04B103/61
CPCC08G12/32C04B24/305C04B2103/61C04B24/24
Inventor 赵晖陈达廖迎娣欧阳峰宣卫红徐海生
Owner JINLING INST OF TECH
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