Modified macromolecular combined corrosion inhibitor and preparation method and application thereof

A polymer and corrosion inhibitor technology, applied in the chemical industry, can solve the problems of environmental pollution, high price, high toxicity, etc., and achieve the effect of easy storage, low cost and safe use

Active Publication Date: 2016-04-13
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the corrosion inhibitors currently on the market are expensive, highly toxic, pollute the environment, and cannot meet social needs

Method used

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  • Modified macromolecular combined corrosion inhibitor and preparation method and application thereof
  • Modified macromolecular combined corrosion inhibitor and preparation method and application thereof
  • Modified macromolecular combined corrosion inhibitor and preparation method and application thereof

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preparation example Construction

[0024] The preparation method of the modified polymer composite corrosion inhibitor of the present invention comprises the following specific steps:

[0025] A, raw material preparation: prepare cassava starch-vinyl acetate-styrene graft copolymer for subsequent use, prepare pickling solution, sodium lignosulfonate, potassium sorbate, ethylene glycol for subsequent use;

[0026] B. Preparation: Add tapioca starch-vinyl acetate-styrene graft copolymer, sodium lignosulfonate, potassium sorbate, and ethylene glycol into the pickling solution according to the ratio of raw materials, stir and mix evenly to obtain the target product.

[0027] The specific implementation method is as follows:

[0028] A. Add a certain amount of tapioca starch into a 250mL three-necked flask, add 100mL distilled water, and pass N in a constant temperature water bath. 2 Stir and gelatinize for 0.5h, the gelatinization temperature is 70-80°C, cool;

[0029] B. Add vinyl acetate and styrene in the mete...

Embodiment 1

[0033] Embodiment 1——The preparation of tapioca starch-vinyl acetate-styrene graft copolymer

[0034] The tapioca starch-vinyl acetate-styrene graft copolymer is composed of Ce(SO 4 ) 2 As an initiator with vinyl acetate and styrene, where:

[0035] a. Add 10g of tapioca starch into a 250mL three-neck flask, add 100mL of distilled water, and pass N in a constant temperature water bath at 75°C 2 Stir and gelatinize for 0.5h, the gelatinization temperature is 70~80°C, cool;

[0036] b. Add 1:2 vinyl acetate and styrene, stir for 20min, then add 10gCe(SO 4 ) 2 , slowly drop 20ml of 1.5mol / L NaHSO 3 solution, and continued to stir for 250 min. After the reaction was terminated, the reaction solution was cooled to room temperature and washed with anhydrous C 2 h 5 OH precipitates the product. After filtering and washing, dry in a vacuum oven at 50°C to constant weight to obtain the grafted crude product.

[0037] c. Weigh 16.5 g of the grafted crude product, use a Soxhlet...

Embodiment 2

[0038] Embodiment 2——The preparation of tapioca starch-vinyl acetate-styrene graft copolymer

[0039] The tapioca starch-vinyl acetate-styrene graft copolymer is composed of (NH 4 ) 2 S 2 o 8 As an initiator with vinyl acetate and styrene, where:

[0040] a. Add 15g of tapioca starch into a 250mL three-neck flask, add 100mL of distilled water, and pass N in a constant temperature water bath at 80°C 2 Stir and gelatinize for 0.6h, the gelatinization temperature is 70~80°C, cool;

[0041] b. Add 1:2 vinyl acetate and styrene, stir for 20min, then add 15gCe(SO 4) 2 , slowly drop 25ml of 2.0mol / L NaHSO 3 solution, and continued to stir for 300 min. After the reaction was terminated, the reaction solution was cooled to room temperature and washed with anhydrous C 2 h 5 OH precipitates the product. After filtering and washing, dry in a vacuum oven at 50°C to constant weight to obtain the grafted crude product.

[0042] c. Weigh 22 g of the grafted crude product, use a So...

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Abstract

The invention discloses a modified macromolecular combined corrosion inhibitor and a preparation method and application thereof. The modified macromolecular combined corrosion inhibitor comprises cassava starch-vinyl acetate-styrene grafted copolymer of 0.1-1.0 g/L, sodium lignin sulfonate of 0.05-0.1 g/L, potassium sorbate of 0.05-0.1 g/L, glycol of 0.01-0.1 g/L and the balance pickling solutions. The preparation method comprises the steps of raw material preparation and preparation. According to the application, the modified macromolecular combined corrosion inhibitor can be applied to preparation of cleaning agents for steel, aluminum, petrochemical equipment, boilers and pipelines. The modified macromolecular combined corrosion inhibitor has the advantages of being free of poisons, low in cost and high in adaptability, obviously inhibiting the corrosion effect of various kinds of organic acid and inorganic acid to metal material, being suitable for acid pickling of the steel and the aluminum in the organic acid and the inorganic acid, being suitable for cleaning of the petrochemical equipment, the boilers and the pipelines, being free of pollution after being used and being safe and convenient to use.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a modified polymer composite corrosion inhibitor and its preparation method and application. Background technique [0002] English professional name of corrosion inhibitor: anti-corrosive.corrosioninhibitor. Also known as a corrosion inhibitor. Its dosage is very small (0.1% to 1%), but the effect is remarkable. Mainly used in neutral medium (boiler water, circulating cooling water), acidic medium (hydrochloric acid for removing scale, acid leaching solution for rust removal of plated parts before electroplating) and gaseous medium (gas phase corrosion inhibitor). The greater the corrosion inhibition efficiency, the better the corrosion inhibition effect. Sometimes lower doses of several different types of corrosion inhibitors can be used in combination to obtain better corrosion inhibition effects, which is called a synergistic effect; on the contrary, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/10C23G1/06
CPCC23F11/10C23G1/065C23G1/068
Inventor 李向红邓书端杜官本李云仙付惠
Owner SOUTHWEST FORESTRY UNIVERSITY
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