阅读说明：本技术 一种耐腐蚀吸波腻子及其制备方法 (Corrosion-resistant wave-absorbing putty and preparation method thereof ) 是由 王建国 王浩继 魏凌云 程文 罗振涛 于 2019-11-28 设计创作，主要内容包括：本发明属于吸波材料技术领域,公开了一种耐腐蚀吸波腻子及其制备方法,耐腐蚀吸波腻子包括甲、乙两种组分,甲组分由以下质量分数的原料组成：吸波填料4～14％、基体树脂70～90％、稀释剂2～10％、分散剂0.5～3％、消泡剂0.5～3％,乙组分由胺固化剂组成；使用前将甲乙两种组分按100：2～6的质量配比混合均匀。本发明提供的吸波腻子可用于修补吸波结构件、吸波贴片、吸波涂层等的裂缝、凹孔等缺陷,也可直接刮涂于有吸波需求的装备部位表面,固化后具有较好的吸波性能和力学性能,同时具备很好的耐腐蚀能力,特别适用于高湿、高盐雾的气候环境下使用；本发明制备方法简单、原料来源广泛、适合大规模生产。(The invention belongs to the technical field of wave-absorbing materials, and discloses corrosion-resistant wave-absorbing putty and a preparation method thereof, wherein the corrosion-resistant wave-absorbing putty comprises a component A and a component B, wherein the component A comprises the following raw materials in percentage by mass: 4-14% of wave-absorbing filler, 70-90% of matrix resin, 2-10% of diluent, 0.5-3% of dispersing agent, 0.5-3% of defoaming agent, and the component B is composed of amine curing agent; before use, the two components of A and B are mixed according to the proportion of 100: 2-6, and mixing uniformly. The wave-absorbing putty provided by the invention can be used for repairing the defects of cracks, concave holes and the like of wave-absorbing structural parts, wave-absorbing patches, wave-absorbing coatings and the like, can also be directly coated on the surface of equipment parts with wave-absorbing requirements in a scraping manner, has better wave-absorbing performance and mechanical property after being cured, has good corrosion resistance, and is particularly suitable for being used in high-humidity and high-salt-fog climatic environments; the preparation method is simple, has wide raw material sources and is suitable for large-scale production.)

1. The corrosion-resistant wave-absorbing putty is characterized by comprising a component A and a component B, wherein the component A and the component B are 100: 2-6 of mixing in a mass ratio;

the component A comprises the following raw materials in parts by mass: 4-14% of wave-absorbing filler, 70-90% of matrix resin, 2-10% of diluent, 0.5-3% of dispersing agent and 0.5-3% of defoaming agent;

the component B consists of amine curing agent.

2. The microwave absorbing putty according to claim 1 characterised in that the microwave absorbing filler is acetylene black.

3. The microwave absorbing putty as claimed in claim 1 wherein the matrix resin is at least one of bisphenol a epoxy resin, bisphenol F epoxy resin and polyurethane modified epoxy resin.

4. The microwave absorbing putty as set forth in claim 1 wherein the diluent is at least one of xylene, cyclohexanone, n-butanol and butyl acetate.

5. The microwave absorbing putty as claimed in claim 1 wherein the amine curing agent is at least one of phenolic amine, aromatic amine, polyether amine and aliphatic amine.

6. The preparation method of the wave-absorbing putty as claimed in claim 1, which is characterized by comprising the following steps:

weighing the matrix resin, the diluent, the dispersing agent and the defoaming agent according to mass percentage, adding the weighed matrix resin, the diluent, the dispersing agent and the defoaming agent into a stirring tank, and stirring for 5-40 min at the rotating speed of 500-1200 rpm;

adding the wave-absorbing filler, and continuously stirring in a high-viscosity material stirring and dispersing device for 60-120 min to prepare a wave-absorbing putty component A;

and step three, directly weighing the corresponding amine curing agent from the putty component B. The component A and the component B are separately packaged and are mixed uniformly according to the proportion before use.

7. The wave-absorbing putty according to claim 1, which is used for repairing wave-absorbing structural parts, wave-absorbing patches and cracks and concave hole defects generated by wave-absorbing coatings in the field of aviation.

8. The wave-absorbing putty according to claim 1, which is used for repairing wave-absorbing structural parts, wave-absorbing patches and cracks and concave hole defects generated by wave-absorbing coatings in the field of electromagnetic protection.

9. The wave-absorbing putty according to claim 1, which is used for repairing wave-absorbing structural parts, wave-absorbing patches and cracks and concave hole defects generated by wave-absorbing coatings in the field of electromagnetic shielding.

10. The wave-absorbing putty according to claim 1 is applied to the surface of a part with wave-absorbing requirements to realize the wave-absorbing function.

Technical Field

The invention belongs to the technical field of wave-absorbing materials, and particularly relates to corrosion-resistant wave-absorbing putty and a preparation method thereof.

Background

Currently, the closest prior art: the wave-absorbing material technology is a technology for weakening, inhibiting, absorbing and deflecting target electromagnetic waves by designing and using certain specific materials, and along with the development of avionics technology and modern material technology, the wave-absorbing material technology is more and more widely applied to military and civil use. Many works are done in this respect in all countries of the world, and the wave-absorbing material technology is successfully applied to the fields of aviation, aerospace, electromagnetic protection, electromagnetic shielding and the like. The wave-absorbing putty is used as a wave-absorbing material, is mainly used for repairing the defects of cracks, concave holes and the like generated in the construction or application process of materials such as wave-absorbing structural parts, wave-absorbing patches, wave-absorbing coatings and the like, and can also be directly coated on the surface of a part with wave-absorbing requirements to realize the wave-absorbing function.

The wave-absorbing putty is a convenient, fast and good-adaptability wave-absorbing material, is originally developed for radar wave-absorbing requirements of aerospace aircrafts, but with technological progress and industrial development, the wave-absorbing putty also starts to be popularized and applied to ground equipment, ocean equipment and civil equipment, and particularly has higher requirements on the corrosion resistance of the wave-absorbing putty when being applied to high-humidity and high-salt-fog regional climatic environments.

In summary, the problems of the prior art are as follows: (1) the existing wave-absorbing putty mostly adopts magnetic metal wave-absorbing fillers such as ferrite, carbonyl iron powder, ferrum-silicon-aluminum, ferrum-silicon-chromium and the like, and the magnetic metal fillers are easy to oxidize in high-humidity and high-salt-spray climatic environments, so that the corrosion resistance is poor, the performance attenuation is fast, the service life is short, and the wave-absorbing putty becomes a great problem restricting the popularization and the application.

(2) The existing wave-absorbing putty mostly adopts magnetic metal wave-absorbing filler, has high product density and large weight gain after construction, is not beneficial to being used on weight-sensitive equipment such as aircrafts, vehicles and the like, and does not meet the development trend of light weight of wave-absorbing materials.

(3) The existing wave-absorbing putty adopts magnetic metal wave-absorbing filler, so that the cost is high and the resource consumption is large.

The difficulty of solving the technical problems is as follows: in order to solve the problems, part of the existing methods are used for improving the corrosion resistance of the wave-absorbing putty and mainly comprise the following steps:

(1) and carrying out surface modification treatment on the magnetic metal wave-absorbing filler. An inert oxide layer or an organic isolating layer is formed on the surface of the alloy by a chemical or physical method so as to achieve the purpose of corrosion resistance. However, such methods have complex processes, high manufacturing cost and poor performance controllability, and are not suitable for large-scale production and application.

(2) And coating an anticorrosive finish paint on the surface of the wave-absorbing putty. However, the anticorrosive finish paint is generally required to have larger thickness in high-humidity and high-salt-spray climatic environments, the thickness increase of the finish paint is not beneficial to the electromagnetic waves to be injected into the wave-absorbing putty and absorbed in the wave-absorbing putty layer, and the overall wave-absorbing performance is influenced. When the anti-corrosion finish paint is damaged to a limited extent by scraping and the like, the wave-absorbing putty is corroded in a large area due to the failure of local protection, and the maintenance cost is high.

(3) The wave-absorbing putty is prepared by adopting a plurality of dielectric loss type wave-absorbing fillers. For example, graphene, carbon fiber, carbon nanotube, carbon black and the like are used as wave-absorbing fillers to prepare the wave-absorbing putty. However, the material has high difficulty in regulating and controlling the wave-absorbing performance, has high requirements on the dielectric parameters, morphology, size, filling concentration, dispersion state and the like of the filler, and can generate obvious dielectric dispersion only by meeting certain conditions simultaneously so as to achieve better wave-absorbing effect. The design and manufacture difficulty is high, and the large-scale production and application are not facilitated.

The significance of solving the technical problems is as follows: the problem of poor corrosion resistance of the existing wave-absorbing putty can be solved, the application range of the wave-absorbing putty is enlarged, and the wave-absorbing putty is especially applied to regional climate environments with high humidity and high salt fog. Meanwhile, the weight of the equipment after construction is increased a little, and the manufacturing and construction cost is low.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides corrosion-resistant wave-absorbing putty and a preparation method thereof.

The corrosion-resistant wave-absorbing putty comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by mass: 4-14% of wave-absorbing filler, 70-90% of matrix resin, 2-10% of diluent, 0.5-3% of dispersing agent and 0.5-3% of defoaming agent; the component B consists of an amine curing agent; before use, the two components of A and B are mixed according to the proportion of 100: 2-6 by mass.

Further, the wave-absorbing filler is acetylene black.

Further, the matrix resin is selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin and polyurethane modified epoxy resin.

Further, the diluent is selected from at least one of xylene, cyclohexanone, n-butanol and butyl acetate.

Further, the dispersant and the defoaming agent are selected from commercially available common dispersant and defoaming agent for solvent-based coating.

Further, the amine curing agent is selected from at least one of phenolic amine, aromatic amine, polyether amine and aliphatic amine.

The invention also aims to provide a preparation method of the wave-absorbing putty, which comprises the following steps:

weighing the matrix resin, the diluent, the dispersing agent and the defoaming agent according to mass percentage, adding the matrix resin, the diluent, the dispersing agent and the defoaming agent into a stirring tank, stirring for 5-40 min at the rotating speed of 500-1200 rpm, then adding the wave-absorbing filler, and continuously stirring for 60-120 min in high-viscosity material stirring and dispersing equipment to obtain a wave-absorbing putty component A;

and directly weighing the corresponding amine curing agent from the putty component B. The component A and the component B are separately packaged and are mixed uniformly according to the proportion before use.

The invention also aims to provide application of the wave-absorbing putty in repairing wave-absorbing structural parts, wave-absorbing patches and cracks and concave hole defects generated by wave-absorbing coatings in the field of aviation.

The invention also aims to provide application of the wave-absorbing putty in repairing wave-absorbing structural parts, wave-absorbing patches and cracks and concave hole defects generated by wave-absorbing coatings in the field of electromagnetic protection.

The invention also aims to provide application of the wave-absorbing putty in repairing wave-absorbing structural parts, wave-absorbing patches and cracks and concave hole defects generated by wave-absorbing coatings in the field of electromagnetic shielding.

The invention also aims to provide the application of the wave-absorbing putty in the realization of the wave-absorbing function by directly coating the surface of a part with wave-absorbing requirements.

In summary, the advantages and positive effects of the invention are:

the corrosion-resistant wave-absorbing putty provided by the invention can solve the problem that the traditional wave-absorbing putty is limited in application in regional climate environments with high humidity and high salt fog, and can improve the weather resistance and prolong the service life of the wave-absorbing putty. Meanwhile, the putty has good mechanical property and wave-absorbing property.

The corrosion-resistant wave-absorbing putty provided by the invention has the advantages of small product density and light weight, is beneficial to being used on various equipment such as aircrafts, vehicles, ships and the like, and accords with the development trend of light weight of wave-absorbing materials.

The preparation method of the corrosion-resistant wave-absorbing putty provided by the invention has the characteristics of simple process, easiness in implementation, wide raw material source and suitability for large-scale production.

Compared with the prior art, the invention has the advantages that: the corrosion-resistant wave-absorbing putty provided by the invention adopts the dielectric loss type wave-absorbing agent acetylene carbon black as a filler, and is compounded with the epoxy resin with a lower dielectric constant, so that the corrosion-resistant wave-absorbing putty has better wave-absorbing performance within a certain filling concentration range, and the carbon black has stable chemical performance and excellent corrosion resistance. The epoxy resin is used as matrix resin, and forms a stable cross-linked structure after being mixed and cured with the amine curing agent, has better environmental resistance and mechanical property, can repair various metal and nonmetal base materials, and meets the actual application requirements of equipment. The putty provided by the invention has good weather resistance and can be stably used for a long time in a high-humidity and high-salt-mist environment. Meanwhile, the preparation method is simple, easy to implement, wide in raw material source and suitable for large-scale production.

Drawings

FIG. 1 is a flow chart of a preparation method of the corrosion-resistant wave-absorbing putty provided by the embodiment of the invention.

FIG. 2 shows the results of a sample reflectivity test provided in example 1 of the present invention.

FIG. 3 shows the results of the reflectivity test of the sample plate in example 2 of the present invention.

FIG. 4 shows the results of the reflectivity test of the sample in example 3 of the present invention.

FIG. 5 is a graph showing the change in appearance before and after 240h of a salt spray test of the prior art.

FIG. 6 shows the appearance change of the salt spray test of the embodiment of the present invention after 2000 h.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The existing wave-absorbing putty mostly adopts magnetic metal wave-absorbing fillers such as ferrite, carbonyl iron powder, ferrum-silicon-aluminum, ferrum-silicon-chromium and the like, the magnetic metal fillers are easy to oxidize in high-humidity and high-salt-spray climatic environments, the corrosion resistance is poor, the service life is short, and the wave-absorbing putty becomes a great problem which restricts the popularization and the application.

Aiming at the problems in the prior art, the invention provides corrosion-resistant wave-absorbing putty and a preparation method thereof, and the invention is described in detail with reference to the attached drawings.

The corrosion-resistant wave-absorbing putty provided by the embodiment of the invention comprises a component A and a component B, wherein the component A comprises the following raw materials in percentage by mass: 4-14% of wave-absorbing filler, 70-90% of matrix resin, 2-10% of diluent, 0.5-3% of dispersing agent and 0.5-3% of defoaming agent; the component B consists of an amine curing agent; before use, the two components of A and B are mixed according to the proportion of 100: 2-6 by mass.

Wherein the wave-absorbing filler is acetylene black.

The matrix resin is selected from at least one of bisphenol A epoxy resin, bisphenol F epoxy resin and polyurethane modified epoxy resin.

The diluent is at least one selected from xylene, cyclohexanone, n-butanol and butyl acetate.

The dispersant and the defoamer are selected from common commercial dispersant and defoamer for solvent-based coatings.

The amine curing agent is at least one selected from phenolic amine, aromatic amine, polyether amine and fatty amine.

As shown in fig. 1, the preparation method of the corrosion-resistant wave-absorbing putty provided by the embodiment of the invention comprises the following steps:

s101, weighing the matrix resin, the diluent, the dispersing agent and the defoaming agent according to mass percentage, adding the mixture into a stirring tank, and stirring for 5-40 min at the rotating speed of 500-1200 rpm.

S102, adding the wave-absorbing filler, and continuously stirring in a high-viscosity material stirring and dispersing device for 60-120 min to obtain the wave-absorbing putty component A.

S103, directly weighing the corresponding amine curing agent from the putty component B. The component A and the component B are separately packaged and are mixed uniformly according to the proportion before use.

The present invention will be further described with reference to the following specific examples.