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Coatings and Coatings for Plastic Enclosures of Home Appliances

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Coatings and Coatings for Plastic Enclosures of Home Appliances

Categories:News Center
Time of issue:2022-04-13 10:27
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(Summary description)Parts made of plastic compounds containing anisotropic thermal conductive fillers represent directional thermal conductivity and anisotropic material properties. Innovative processes help improve the thermal conductivity of components and optimize their performance by changing the direction of the filler. Why is it difficult for plastic phone shells to dissipate heat? How to improve?

Due to the increasing demand for electromechanical systems in the industry, especially the trend towards miniaturization, people are beginning to explore new concepts of thermal management. Due to the impact of miniaturization, the available space and air in the modules are reduced, and active cooling components such as ventilators are also being scrapped. One way to meet these new requirements is to use plastic component shells to eliminate heat.

Firstly, plastic shell manufacturers believe that the more thermal conductive fillers, the worse.

Plastic itself has low thermal conductivity, so it is often necessary to use thermal additives to make thermal materials. In addition to functional integration, thermal conductive plastics also have special properties - electrical insulation, without metal materials (although their thermal conductivity and energy are very good). The combination of these advantages and the high design freedom of plastic components provide new methods for thermal management of technical components.

In addition, plastic shell manufacturers believe that thermal conductive plastics can be obtained from multiple suppliers in the market, mostly between 1-20W/mK. The investigation shows that the thermal conductivity of thermal conductive plastics is only 3-5 W/mK, which can improve the heat management of electronic modules. As is well known, the thermal conductivity mainly depends on:

1. Thermal conductivity of plastic

2. Packaging type

3. Filler shape (spherical, sheetlike, or fibrous)

4. Filler size

5. Charging capacity

However, the amount of filler used not only has a significant impact on thermal conductivity, but also on other properties. The higher the filler content, the more the thermal conductivity does not increase proportionally, and the processing performance of thermal conductive plastics significantly decreases. In addition, thermal conductive fillers are generally more expensive than engineering plastics, so as the content of the filler increases, the material cost will significantly increase. When selecting thermal conductive plastics, the relationship between thermal conductivity, processing performance, and material cost should be evaluated. For thermal conductive plastics, the principle of 'more is better' does not apply.

2、 The thermal conductivity of the formed flow direction product is relatively good

The research results of both thermal conductive plastics and fiber reinforced plastics show that the use of unequal axis filling materials can exhibit anisotropic material properties in components. Therefore, this anisotropy depends on the value of the processing. The fluid dynamics acting on the fillers during the processing have a significant impact on their taste. Due to the fact that the thermal conductivity of unequal axis fillers is mainly reflected in the preferred direction (such as the fiber length direction), the direction of the filler will have a significant impact on the anisotropic thermal conductivity of the finished component.

When using traditional processing methods to produce flat or frame components, the filling material mainly follows the flow direction and width direction. Especially in thin-walled components, the filling material is rarely aligned with the thickness direction. Therefore, good thermal conductivity mainly occurs in the flow direction and width direction. However, these filling directions are not applicable to all application fields. For structural components, internal heat loss is mainly eliminated on the shell wall (thickness direction). From this perspective, high thermal conductivity in the thickness direction is very important. Unfortunately, the orientation of fillers achieved using traditional processing methods is not ideal for this application. As the filling content increases, only the thermal conductivity in the thickness direction will slightly increase, but the other performance of the component will decrease.

3、 Plastic shell manufacturers believe that the new process can improve the thermal conductivity in the thickness direction

As mentioned by the plastic shell manufacturer, the anisotropy of thermal conductive plastics, which is not dominant, is mainly affected by the flow behavior during the processing. This directional adjustment is achieved by improving the melt flow inside the mold, while causing changes in shear flow and tensile flow.

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Coatings and Coatings for Plastic Enclosures of Home Appliances

Categories:News Center
Time of issue:2022-04-13 10:27
Views:

Information

Plastic materials have become increasingly widely used due to their advantages such as light weight, cheap price, convenient manufacturing, and excellent performance. The proportion of engineering plastics replacing other materials can also be used as a measure of a country's level of technological development. Below, plastic shell manufacturers will discuss the coatings and coatings used for plastic shells of household appliances.

Plastic surface coatings and coating technology have rapidly developed into an emerging industry. From ordinary decorative properties to special functional properties, and from solvent based to water-based.

Plastic shell manufacturers believe that in the field of household appliances, plastic materials can be used as shells for almost all household appliances such as mobile phones, computers, televisions, washing machines, audio equipment, cameras, air conditioners, etc.

When molding plastic products, there may be defects such as uneven color, monotonous color, stains and defects, and problems such as aging, brittleness, scratches, stains, and static electricity are prone to occur. Paint can avoid these shortcomings and problems.

The task of applying plastic paint to plastic shell manufacturers has the following effects.

Cover up defects in processing and forming. Improve the decorative appearance and excellent texture, such as gloss, printed matter, patterns, metal or wood texture.

Add basic protective functions such as wear resistance, scratch resistance, weather resistance, light resistance, flame retardancy, content control, and drug resistance to improve the service life of plastic products.

Electrical insulation, conductivity, electromagnetic shielding, anti-static, anti-corrosion, mold proof, sterilization, insect killing, high temperature, insulation, temperature display, insulation elimination, infrared reflection, solar absorption, luminescence, high light display, anti slip, lubrication.

Plastic shell manufacturers trust the surface characteristics and adhesion mechanism of plastic

Plastic is a special device that belongs to surfaces with low polarity and surface free energy, making it difficult to adhere.

Diffusion theory, solubility parameter theory; Electrostatic theory; Chemical bond theory; Adsorption and mechanical bite theory, etc.

Plastic shell manufacturers talk about the influencing factors of plastic coating adhesion:

The influence of basic materials in paint

The Effect of Solvents on Coatings

The influence of various additives

The Effect of Internal Stress on Plastic Substrates

Plastic shell coatings and coatings for household appliances

The commonly used materials for plastic shells of household appliances are ABS and HIPS. PVC, PP, HIPP, PE, PC, PMMA, AS, etc. are also used as electrical enclosures for writers. PVC, PC, PMMA, and AS mainly use transparent materials made by writers.

There are mainly thermoplastic acrylic resin paint, thermosetting acrylic polyurethane resin paint, chlorinated polyolefin modified paint, modified polyurethane resin paint, fluorocarbon resin paint, chloroacetic resin paint, nitro resin paint, modified epoxy resin paint, alkyd resin paint, etc.

Acrylic coatings are commonly used, while fluorocarbon resin coatings have developed rapidly in recent years.

The selection of paint shared by plastic shell manufacturers should follow the following principles:

According to the characteristics of the base material plastics, select the appropriate film forming resin system and solvent system.

Coatings need to meet performance requirements under specific usage conditions such as physical, chemical, and photoelectric properties. Select coatings based on coating method and coating process.

Excellent cost-effectiveness: In compliance with environmental protection requirements.

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Previous: What are acrylic lenses? What are the advantages?

Next: Why is it difficult for plastic phone shells to dissipate heat? How to improve?

Previous: What are acrylic lenses? What are the advantages?

Next: Why is it difficult for plastic phone shells to dissipate heat? How to improve?

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