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Tannic acid/eleostearic acid toughened shellac resin anti-corrosion coating and preparation method thereof

A technology of shellac resin and anti-corrosion coating, which is applied in the direction of shellac coating, anti-corrosion coating, coating, etc., can solve the problems of poor anti-corrosion performance, and achieve the effect of high use value, good anti-corrosion and moisture-proof, and good adhesion

Active Publication Date: 2022-07-26
WUFENG CHICHENG BIOTECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The anti-corrosion performance of single shellac resin coating or tungoleic acid toughened shellac resin coating is not good

Method used

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  • Tannic acid/eleostearic acid toughened shellac resin anti-corrosion coating and preparation method thereof
  • Tannic acid/eleostearic acid toughened shellac resin anti-corrosion coating and preparation method thereof
  • Tannic acid/eleostearic acid toughened shellac resin anti-corrosion coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 1. Tung oleic acid toughening modification treatment

[0057] Diels-Alder addition was performed between the double bond in the shellac resin and the conjugated double bond of eleostearic acid, and the eleostearic acid was introduced into the structure of the shellac resin.

[0058] 1-1. Diels-Alder addition reaction

[0059] Accurately weighed shellac resin 12g and eleuic acid 2g were placed in a clean 250mL single-necked flask, and a diluent DMF (3mL) was added (the diluent is used to reduce the viscosity of the system); then the flask was placed in a metal bath, heated and heated. , carry out a metal bath to completely melt the reactants in the flask, reflux and stir under the condition that the temperature of the metal bath reaction system is kept at 110 ° C (usually 100-130 ° C), and carry out toughening modification treatment, toughening modification treatment process Diels-Alder addition reaction occurs between shellac resin and tauoleic acid, that is, the shell...

Embodiment 1A

[0072] In addition to step 2) in the process of compounding tannic acid, weigh the eleostearic acid toughened shellac resin (MS-1) prepared in step 1) and place it in a clean beaker, and then inject an appropriate amount of 0.3M NH 3 The solution (aqueous ammonia solution) was stirred and dissolved to obtain the tauoleic acid toughened shellac resin-ammonia water system, and the rest were the same as in Example 1, namely, 10 mL of the tauoleic acid toughened shellac resin-ammonia water system was obtained, and the tauoleic acid toughened shellac resin-aqueous ammonia system was obtained. The solid content of the shellac resin-ammonia system is 15wt.% (usually 8-25wt.%), that is, a coating liquid with a solid content of 15wt.% (usually 8-25wt.%) is prepared;

[0073]In the present embodiment, the ammonia solution with a concentration of 0.3M is used to dissolve the shellac resin and the tauoleic acid toughened shellac resin, and the ammonia solution with other concentrations (fo...

Embodiment 2

[0076] 1. Tung oleic acid toughening modification treatment

[0077] Except that the quality of the accurately weighed eleostearic acid is 4g, the mass ratio of shellac resin and eleostearic acid is 3:1; the consumption of diluent DMF is to dilute every 6g of shellac resin with 1mL DMF; the temperature of Diels-Alder addition reaction The temperature is 100° C. and the reaction time is 4h, the rest is the same as that in Example 1, and the eleostearic acid toughened shellac resin (MS-2) is obtained.

[0078] 2. Tannin compound treatment

[0079] Except that the solid content of the eleostearic acid toughened shellac resin-ethanol system is 15wt.%; the ratio of the added mass of tannic acid to the mass of the eleostearic acid toughened shellac resin-ethanol system is 0.5 : 100; except that the stirring reaction time was 30 min, the rest were the same as in Example 1.

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Abstract

The invention discloses a tannic acid / eleostearic acid toughened shellac resin anti-corrosion coating and a preparation method thereof. The preparation method comprises the following steps: toughening modified shellac resin by using eleostearic acid, and compounding the modified shellac resin with tannic acid. A coating film of the tannic acid / eleostearic acid toughened shellac resin is long in neutral salt mist resistance and neutral salt water resistance time, good in toughness, good in hydrophobicity and high in adhesive force, and can be used as a protective film of a metal device in a humid environment or used for anti-corrosion protection of a metal structure, equipment, a pipeline and a cable working in a multi-deformation environment. The coating prepared from natural products (eleostearic acid, shellac resin and tannic acid) is good in toughness, the characteristic of high brittleness of shellac resin is overcome, the prepared tannic acid / eleostearic acid toughened shellac resin coating can be used as an insulating coating of a plurality of electronic devices and metal parts, corrosion of the metal parts is effectively prevented, and the service life of the metal parts is prolonged. The release of harmful volatile organic compounds (VOCs) in the construction process of the organic coating is avoided, and the organic coating can be applied to an anti-corrosion environment with relatively high requirements on environmental protection and safety.

Description

technical field [0001] The invention relates to a method for modifying natural products, in particular to a method for chemically modifying and treating shellac resin and the tungoleic acid toughening shellac resin prepared by the method, and belongs to the technical field of natural products. Background technique [0002] Nowadays, people's awareness of environmental protection is gradually increasing, and more and more attention is paid to "green" and "sustainable" development. This new development concept has also prompted all walks of life to actively carry out technological innovation, and the field of coatings is no exception. [0003] Shellac resin is a natural resin with both thermoplastic and thermosetting properties. Because of its good wear resistance, oil resistance, hydrophobicity, insulation and film-forming properties, it is used in food, medicine, military industry, coatings and other fields. In the food field, shellac resin is used as a film preservative fo...

Claims

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Application Information

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IPC IPC(8): C09D193/02C09D5/08C09D7/63
CPCC09D193/02C09D5/08C09D7/63C08K5/1545
Inventor 陈赤清李坤张弘李春吟张雯雯毛业富刘义稳陈清龙
Owner WUFENG CHICHENG BIOTECH
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