Corrosion-inhibiting primer for structural bonding and preparation method of corrosion-inhibiting primer

A corrosion-inhibiting, structural adhesive technology, applied in the direction of adhesives, epoxy resin adhesives, non-polymer adhesive additives, etc., can solve the short-term as long as 10 days, the longest is only 20 days, the epoxy resin system primer is durable Poor damp and heat performance, affecting the bonding of large metal parts, etc., achieves the effect of improving storage stability, good corrosion inhibition performance, and meeting the needs of corrosion inhibition primers

Active Publication Date: 2022-07-22
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are two main problems in corrosion-inhibiting primers used for structural bonding of metal substrates: first, the storage period at room temperature is short. The storage period of primer products at home and abroad is only 10 days at the shortest and 20 days at the longest First, it affects the bonding of large metal parts; second, the primers produced by domestic and foreign companies can only match certain grades of adhesive films and other materials in the company, and are not compatible with other grades or various grades of other companies. Poor matching of materials such as membranes, which makes it narrow in applicability
Third, the moisture and heat resistance of the epoxy resin system primer is poor, which limits its application range

Method used

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  • Corrosion-inhibiting primer for structural bonding and preparation method of corrosion-inhibiting primer
  • Corrosion-inhibiting primer for structural bonding and preparation method of corrosion-inhibiting primer
  • Corrosion-inhibiting primer for structural bonding and preparation method of corrosion-inhibiting primer

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preparation example Construction

[0024] A preparation method of a corrosion-inhibiting primer for structural bonding, comprising the following steps:

[0025] ①Weigh chromate raw material, accelerator and graphene oxide by weight; mix graphene oxide and deionized water, and ultrasonically treat for 30 minutes to obtain a uniformly dispersed graphene oxide aqueous solution; add chromate raw material and make it Completely dissolve; add the mixed solution to the reaction kettle, heat up to 100°C to 120°C, and stir for 30 minutes; reduce the temperature of the reaction kettle to 30°C to 60°C, add accelerator, and stir for 30 minutes; filter the product, vacuum drying to obtain accelerator / chromate / graphene composite;

[0026] ②Weigh epoxy resin, curing agent, toughening agent and accelerator / chromate / graphene composite by weight;

[0027] ③Add epoxy resin, curing agent, toughening agent and accelerator / chromate / graphene composite into the reaction kettle, and add solvent, and the rotating speed is 200-600 rev / m...

Embodiment 1

[0029] ①Weigh 70.8g sodium dichromate, 28.8g sodium carbonate, 15g 2,4-bis(N,N-dimethyl)urea toluene accelerator and 120g graphene oxide; mix graphene oxide and deionized water, ultrasonically Treat for 30 minutes to obtain a uniformly dispersed graphene oxide aqueous solution; add sodium dichromate and sodium carbonate, and dissolve them completely; add the mixed solution to the reaction kettle, heat up to 120 ° C, and stir for 30 minutes; The temperature dropped to 50°C, 2,4-bis(N,N-dimethyl)urea toluene was added, and stirred for 30 minutes; the product was filtered and vacuum-dried to obtain accelerator / chromate / graphene composite;

[0030] ②Weigh 100g E-44 epoxy resin, 180g 0194 epoxy resin, 10g dicyandiamide curing agent, 50g carboxyl-terminated polybutadiene rubber toughener and 120g accelerator / chromate / graphene composite;

[0031] ③Add E-44 epoxy resin, 0194 epoxy resin, dicyandiamide curing agent, carboxyl-terminated polybutadiene rubber toughening agent and accelera...

Embodiment 2

[0033]①Weigh 64.9g of sodium dichromate, 26.4g of sodium carbonate, 12g of 3-(3,4-dichlorophenyl)-1,1-dimethylurea accelerator and 105g of graphene oxide; Ionized water was mixed, and ultrasonically treated for 30 minutes to obtain a uniformly dispersed graphene oxide aqueous solution; sodium dichromate and sodium carbonate were added, and the two were completely dissolved; the mixed solution was added to the reaction kettle, heated to 120 ° C, and stirred for 30 minutes; the temperature of the reactor was lowered to 40° C., 3-(3,4-dichlorophenyl)-1,1-dimethylurea was added, and stirred for 30 minutes; the product was filtered and vacuum-dried to obtain accelerator / chromium salt / graphene composite;

[0034] ②Weigh 75g E-51 epoxy resin, 200g 0191 epoxy resin, 12g dicyandiamide curing agent, 60g carboxyl-terminated nitrile rubber toughening agent and 110g accelerator / chromate / graphene composite;

[0035] ③Add E-51 epoxy resin, 0191 epoxy resin, dicyandiamide curing agent, carbo...

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Abstract

The invention belongs to the technical field of adhesives, and particularly relates to a corrosion-inhibiting primer for structural bonding and a preparation method of the corrosion-inhibiting primer. The corrosion-inhibiting primer is prepared by uniformly mixing epoxy resin, a toughening agent, a curing agent, an accelerant/chromate/graphene compound, a solvent and the like. In an accelerant/chromate/graphene compound, an accelerant and chromate are simultaneously loaded on a graphene sheet layer through a hydrothermal reaction. On the premise of not influencing other properties, water molecules are prevented from invading epoxy resin and corrosion of a metal substrate is inhibited by utilizing a lamellar structure of graphene and chromate on the surface of a lamellar layer; the reaction activity of the substituted urea accelerant is reduced by utilizing the steric effect and ionic bond complexing action of graphene. The corrosion-inhibiting primer solves the problems that the primer of an epoxy resin system is poor in humidity and heat resistance and short in storage period, also has good corrosion resistance and applicability, meets the requirements of large aviation aircrafts on corrosion-inhibiting primers, and is suitable for cementing of medium-temperature curing metal bearing structures.

Description

technical field [0001] The invention belongs to the technical field of adhesives, and particularly relates to a corrosion-inhibiting primer for structural adhesive bonding and a preparation method thereof. Background technique [0002] When bonding the metal substrate structure, it is necessary to first clean the metal substrate with a solvent such as acetone to remove grease, dust and dirt on the surface; Anodized film with good adhesion. However, in order to avoid contamination of the anodic oxide film and ensure the bonding quality, the treated metal substrate needs to be bonded within 4 hours, which greatly limits its application. Therefore, it is necessary to spray a layer of corrosion-inhibiting primer for structural bonding on the surface of the treated metal substrate. On the premise of not affecting the bonding performance between the metal substrate and the adhesive film, on the one hand, the primer can greatly prolong the bonding time (20-30 days) of the treated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J163/00C09J11/08C09J11/04C09J11/06
CPCC09J163/00C09J11/08C09J11/04C09J11/06C08L13/00C08K3/042C08K3/24C08K9/12C08K5/21
Inventor 陈宇赵升龙刘清方
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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