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A kind of corrosion inhibitor for pickling and its synthesis method

A synthesis method and corrosion inhibitor technology, which is applied in the field of water treatment chemicals, can solve the problems of corrosion inhibitors, poor compatibility between acids and surfactants, troublesome use process, and unsatisfactory allyl water solubility, etc. Achieve the effect of good dispersion and solubility performance

Active Publication Date: 2018-03-30
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Qi Honghua and others studied the corrosion inhibition performance of allyl thiourea in metal hydrochloric acid pickling, but the unsatisfactory water solubility of allyl makes it more troublesome in the process of use, and it is not suitable for slowing the surface of metal substrates with oil stains. The erosion effect is greatly affected by
[0005] Pickling liquid can be used to wash off the rust and scale on the surface of some industrial equipment such as reactors, air conditioners, and refinery cooling pipes, but it has no effect on cleaning the oil on the surface, so solvents must be added to wash or surface In the process of active agent washing, in order to shorten the process, surfactants are also added to the pickling solution, but sometimes the compatibility of corrosion inhibitors, acids and surfactants is not very good, which affects its treatment effect

Method used

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  • A kind of corrosion inhibitor for pickling and its synthesis method
  • A kind of corrosion inhibitor for pickling and its synthesis method
  • A kind of corrosion inhibitor for pickling and its synthesis method

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Experimental program
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Effect test

Embodiment 1

[0026] A corrosion inhibitor for pickling of the present invention is a terpolymer formed by copolymerization of allyl thiourea, fatty alcohol polyoxyethylene ether acrylate, and p-styrenesulfonic acid, wherein fatty alcohol polyoxyethylene ether Acrylates have the formula where R is C 12 h 21 —, n is 9.

[0027] The copolymer synthesis method is as follows:

[0028] (1) Allyl thiourea, fatty alcohol polyoxyethylene ether acrylate and p-styrenesulfonic acid are added to the reactor according to the mass ratio of 1:0.5:1, and methanol with a total monomer mass of 100% is added, and stir to dissolve;

[0029] (2) Turn on and heat to 55°C, weigh the initiator azobisisobutyronitrile of 0.5% of the total monomer mass, dissolve it in methanol, and control the dropwise addition for 1 hour;

[0030] (3) After the dropwise addition, raise the temperature to 85°C and continue the reaction for 6 hours to obtain a terpolymer with an average molecular weight of 865, which is diluted ...

Embodiment 2

[0032] A corrosion inhibitor for pickling of the present invention is a terpolymer formed by copolymerization of allyl thiourea, fatty alcohol polyoxyethylene ether acrylate, and p-styrenesulfonic acid, wherein fatty alcohol polyoxyethylene ether Acrylates have the formula where R is C 8 h 17 —, n is 6.

[0033] The copolymer synthesis method is as follows:

[0034] (1) Allyl thiourea, fatty alcohol polyoxyethylene ether acrylate and p-styrenesulfonic acid are added to the reactor according to the mass ratio of 1:0.3:0.7, and 30% ethanol of the total monomer mass is added, and stir to dissolve;

[0035] (2) Turn on and heat to 60°C, weigh 1% of the total monomer mass of benzoyl peroxide / sodium bisulfite (molar ratio 2:1) and dissolve it in ethanol, and control the dropwise addition for 0.5 hours;

[0036] (3) After the dropwise addition, raise the temperature to 90°C and continue the reaction for 3 hours to obtain a terpolymer with an average molecular weight of 480, whi...

Embodiment 3

[0038] A corrosion inhibitor for pickling of the present invention is a terpolymer formed by copolymerization of allyl thiourea, fatty alcohol polyoxyethylene ether acrylate, and p-styrenesulfonic acid, wherein fatty alcohol polyoxyethylene ether Acrylates have the formula where R is C 6 h 13 —, n is 10.

[0039] The copolymer synthesis method is as follows:

[0040] (1) Add allyl thiourea, fatty alcohol polyoxyethylene ether acrylate and p-styrenesulfonic acid into the reactor according to the mass ratio of 1:0.2:1.2, and add 80% of the total monomer mass isopropyl Alcohol, and stir to dissolve;

[0041] (2) Turn on and heat to 60°C, weigh 3% of the total monomer mass of benzoyl peroxide / sodium bisulfite (molar ratio 2:1) and dissolve it in isopropanol, and control the dropwise addition for 1.5 hours;

[0042] (3) After the dropwise addition, raise the temperature to 90°C and continue the reaction for 5 hours to obtain a terpolymer with an average molecular weight of 10...

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Abstract

The invention discloses a corrosion inhibitor used for pickling and a synthetic method of the corrosion inhibitor. The corrosion inhibitor used for pickling is a terpolymer prepared by taking allyl thiourea, fatty alcohol-polyoxyethylene ether acrylate and styryl sulphonic acid as comonomers, the mass ratio of allyl thiourea to fatty alcohol-polyoxyethylene ether acrylate to styryl sulphonic acid is 1:0.2-1:0.5-1.5, the average molecular weight of the terpolymer is 300-1500, and the structural formula of fatty alcohol-polyoxyethylene ether acrylate is as shown in the specification, wherein R is C(6-18), and n is 6-20. The copolymer can achieve the inhibition efficiency of more than 90% during pickling of industrial equipment, can clear away grease dirt attached to the wall of an apparatus, and achieves the dual effects of pickling and solvent washing at the same time, thus being an efficient pickling corrosion inhibitor which can save labor and lower expenses during washing of industrial equipment.

Description

technical field [0001] The invention belongs to the field of water treatment chemicals, and in particular relates to a corrosion inhibitor for pickling and a synthesis method thereof. Background technique [0002] Using hydrochloric acid, sulfuric acid, citric acid and other inorganic organic acids to clean and descale the surface of metal material equipment and pipelines, it is widely used in metal processing, machinery, metallurgy, electric power, chemical industry and other industries. Due to acidic corrosion, the phenomenon of "over corrosion" often occurs in the pickling process, that is, the cleaning process not only removes the rust and dirt on the surface, but also corrodes a part of the metal substrate. Therefore, the loss of metal materials and the waste of pickling liquid in the pickling process are caused, and a large amount of pickling waste liquid is produced at the same time, causing environmental pollution. [0003] In order to avoid the "overcorrosion" phen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/06
CPCC23G1/068
Inventor 王东宇程终发刘强赵开源张秀华
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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