What is epoxy resin?
Epoxy resin is an organic compound which generally contains two or more epoxy groups in the molecule, and their relative molecular mass is not high except for a few. The molecular structure of the epoxy resin is characterized by the presence of an active epoxy group in the molecular chain, and the epoxy group may be located at the end, in the middle or in a ring structure of the molecular chain. Since the molecular structure contains an active epoxy group, they can be cross-linked with various types of curing agents to form an insoluble polymer having a three-dimensional network structure. A polymer compound containing an epoxy group in a molecular structure is collectively referred to as an epoxy resin. The cured epoxy resin has good physical and chemical properties. It has excellent bonding strength to the surface of metal and non-metal materials, good dielectric properties, small deformation shrinkage, good dimensional stability, high hardness and flexibility. It has good properties and is stable to alkali and most solvents. It is widely used in various departments of national defense and national economy for casting, dipping, laminating, bonding, coating and other purposes.
The excellent physical and mechanical properties of epoxy resins, the bonding properties with various materials, and the flexibility of their use are not available in other thermoset plastics. Therefore, it can be used in coatings, composites, castings, adhesives, molded materials and injection molding materials, and is widely used in various fields of the national economy.
Epoxy resin use
1, paint
The application of epoxy resin in coatings accounts for a large proportion, and it can be made into various varieties with different characteristics and uses. Commonality:
(1) Excellent chemical resistance, especially alkali resistance;
(2) The paint film has strong adhesion, especially to metal;
(3) It has good heat resistance and electrical insulation;
(4) The paint film has good color retention.
However, the bisphenol a-type epoxy resin coating has poor weather resistance, and the paint film is easy to be powdered and lost in the outdoor, and is not suitable for outdoor coatings and high decorative coatings. Therefore, epoxy resin coatings are mainly used as anticorrosive paints, metal primers, and insulating paints, but coatings made of heterocyclic and cycloaliphatic epoxy resins can be used outdoors.
2, adhesive
In addition to poor adhesion to non-polar plastics such as polyolefins, epoxy resins are used for various metal materials such as aluminum, steel, iron, copper; non-metallic materials such as glass, wood, concrete, etc.; and thermosetting plastics such as phenolic , amino, unsaturated polyester, etc. have excellent bonding properties, so it is called universal adhesive. Epoxy adhesives are an important variety of structural adhesives.
3. Electronic and electrical materials
Due to its many unique advantages, such as high insulation performance, high structural strength and good sealing performance, epoxy resin has been widely used in the insulation and packaging of high and low voltage electrical appliances, motors and electronic components, and has developed rapidly. Mainly used:
(1) Casting of electrical and motor insulation packages. The manufacture of integral fully sealed and insulated packages for high and low voltage electrical appliances such as electromagnets, contactor coils, transformers, dry transformers, etc. It has developed rapidly in the electrical industry. From atmospheric casting, vacuum casting has been developed to automatic pressure gel molding.
(2) Widely used for potting insulation of devices equipped with electronic components and wiring. Has become an indispensable important insulation material for the electronics industry.
(3) Electronic grade epoxy molding compound is used for plastic sealing of semiconductor components. It has developed very fast in recent years. Due to its superior performance, it has a tendency to replace traditional metal, ceramic and glass packaging.
(4) Epoxy laminated plastics are widely used in electronics and electrical appliances. Among them, the development of epoxy copper clad laminates is particularly rapid and has become one of the basic materials for the electronics industry.
In addition, epoxy insulating coatings, insulating adhesives and electrical adhesives are also used in a large number of applications.
4. Engineering plastics and composite materials
Epoxy engineering plastics mainly include epoxy molding compounds and epoxy laminated plastics for high pressure molding, as well as epoxy foam plastics. Epoxy engineering plastics can also be considered as a generalized epoxy composite. Epoxy composites are mainly epoxy glass reinforced plastic (universal composite materials) and epoxy structural composite materials, such as pultrusion epoxy profiles, wound-formed hollow rotor products and high-performance composite materials. Epoxy composite materials are an important structural and functional material in the high-tech fields of chemical engineering, aerospace, military and military.
5, civil construction materials
Mainly used as anti-corrosion floor, epoxy mortar and concrete products, high-grade pavement and airport runway, quick repair materials, grouting materials for reinforcing foundation foundation, construction adhesives and coatings.
Anodizing treatment is a surface finishing process for aluminum that forms a protective oxide layer on the surface of the metal. The process involves immersing the aluminum material in an electrolytic solution and passing an electric current through it. This creates a uniform and durable oxide coating that enhances the corrosion resistance and aesthetic appeal of the metal.
There are two main types of anodizing treatment: sulfuric acid anodizing and hard anodizing. Sulfuric acid anodizing is the most common type and produces a thinner, more decorative layer of oxide coating, while hard anodizing results in a thicker, harder, and corrosion-resistant layer that is ideal for industrial and automotive applications.
Anodizing treatment provides numerous benefits to aluminum products. It increases their resistance to corrosion and wear and tear, making them suitable for use in harsh environmental conditions. The process also enhances the strength and durability of the metal, extending its lifespan and reducing the need for maintenance.
Another advantage of anodizing treatment is its ability to add color and texture to aluminum products. Different dyes can be added to the electrolyte solution to produce a range of colors, from bright and vibrant to more subdued tones. Additionally, different textures and finishes can be achieved through specialized anodizing processes, such as matte anodizing or brushed anodizing.
Anodizing treatment is commonly used in various industries, including aerospace, automotive, construction, and consumer goods. It is an eco-friendly process as it uses no hazardous materials and produces minimal waste. However, it is important to note that anodizing treatment may affect the dimensional accuracy of the product and may mask defects that are present on the surface of the material.
Overall, anodizing treatment provides an effective way to enhance the functionality and appearance of aluminum products. As research and innovation continue to advance, even more advanced and innovative applications of anodized aluminum are expected to emerge.
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