Alexei Volkov
Plastics are prone to UV damage, just like human skin. UV radiation can cause discoloration, fading, cracking, and brittleness in plastic products, impacting their functionality and durability. This is because UV light can break down the pigments and dyes used in the plastic, resulting in a yellowing or browning effect. To prevent this, plastics can be treated with UV-resistant additives or stabilizers, or manufactured with UV-resistant materials, to increase their longevity and performance.
| Characteristics | Values |
|---|---|
| Plastic's vulnerability to UV damage | Just like human skin, plastics are prone to UV damage. |
| Plastic products designed for outdoor use | Should be manufactured using UV-resistant plastics. |
| Plastic's reaction to UV radiation | Plastics either absorb UV radiation or produce free radicals that negatively affect the material’s mechanical properties. |
| Effect of UV radiation on plastic | Discoloration, reduced impact and tensile strength, and deformation of the material. |
| UV-resistant plastics | Acrylic, HDPE, Polycarbonate, PVDF, Polyphenylene sulfide (PPS), Nylon 6 or Nylon 12. |
| Additives to improve UV resistance | Blockers, absorbers, and stabilizers. |
| Blockers | Carbon black, titanium dioxide, titanium oxide. |
| Absorbers | Benzophenones, benzotriazoles, Hindered Amine Light Stabilizers (HALS). |
| Stabilizers | UV-resistant caps, UV stabilizers. |
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What You'll Learn
Plastic is prone to UV damage
Just like human skin, plastics are prone to UV damage. When plastics are exposed to ultraviolet radiation from the sun, they either absorb it or produce free radicals that negatively affect the material’s mechanical properties. Long-term exposure to UV radiation can lead to discoloration, reduced impact and tensile strength, and overall deformation of the material.
UV-resistant plastics are ideal for outdoor use. Acrylic, HDPE, and Polycarbonate are some of the top options for UV-resistant plastics. Acrylic is a popular choice for outdoor signs and displays, light fixtures, decorative panels, and colored lenses. It is a transparent plastic that suffers as little as 3% degradation over a 10-year period when used in outdoor applications. Acrylic also offers good scratch resistance, making it an excellent choice for long-term use. However, it is not very strong and is so rigid and brittle that it is rarely used for any load-bearing parts.
HDPE is a durable plastic when hardened, but its nature makes it easy to melt and mold into unique shapes. It is often used in playground equipment because it doesn't create sharp edges when it breaks. It is also resistant to alcohols, bases, and acids and doesn't accept graffiti easily. It holds its color well when used outdoors as well. Polycarbonate is another good option for windows and signage, offering similar transparency to acrylic. It is also strong, making it suitable for safety goggles and shields. It is more costly, but its durability and UV resistance make it worth the price for certain components.
To make plastics UV resistant, additives or stabilizers are added to the basic plastic material. There are three main kinds of UV-resistant additives: blockers, absorbers, and stabilizers. Blockers coat plastics with a protective layer, keeping them safe from UV radiation. Carbon black is a common and effective blocker for outdoor applications, blocking UV rays at a rate of about 2%. Titanium dioxide, a pigment, is also an effective blocking solution. Absorbers are usually organic compounds designed to absorb UV light and emit less harmful energy, such as heat, instead. Benzophenones and benzotriazoles are common absorbers.
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UV-resistant additives
Plastics are prone to degradation when exposed to UV light, which can occur during processing or once the product is in use. This degradation can lead to a reduction in the lifespan of the plastic, with symptoms such as brittleness, discolouration, and loss of physical properties such as impact strength and tensile strength.
There are three main types of UV-resistant additives: blockers, absorbers, and stabilizers. Blockers coat plastics with a protective layer, shielding them from UV radiation. Carbon black is a common and effective blocker, blocking UV rays at a rate of about 2%. Titanium dioxide is another blocker that is used as a pigment.
Absorbers are typically organic compounds designed to absorb UV light and emit less harmful energy, such as heat, instead. Benzophenones and benzotriazoles are common absorbers, with the latter having a low colour influence over materials and being used at low dose rates.
Stabilizers such as hindered amine light stabilizers (HALS) are also used to prevent degradation. They target and trap the free radicals produced during photo oxidation, preventing them from reacting with the polymer structure.
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Plastic products for outdoor use
Plastics are prone to UV damage, which can lead to discoloration, reduced strength, and deformation. Therefore, plastic products designed for outdoor use should be manufactured using UV-resistant plastics.
UV-resistant plastics are essential for outdoor applications as they can withstand exposure to sunlight and maintain their appearance and functionality for longer. There are two types of UV-resistant plastics: those that are naturally resistant to UV degradation, and those that do not naturally resist degradation but require additives to improve their UV resistance.
Some examples of UV-resistant plastics include:
- Acrylic: This plastic is resistant to UV radiation and is often used in signs, windows, and skylights due to its clarity.
- Polycarbonate: This plastic is commonly used in outdoor signage, protective eyewear, and greenhouse panels where UV resistance is critical.
- Polyphenylene sulfide (PPS): A high-performance engineering plastic with excellent UV resistance, making it popular for outdoor goods and devices.
- PVDF: A UV-light-resistant plastic that offers thermal stability, abrasion shielding, and protection against chemicals and UV radiation.
- HDPE: A durable plastic that is easy to melt and mold into unique shapes. It is often used in playground equipment and is resistant to alcohols, bases, acids, and graffiti.
To enhance the UV resistance of plastics, additives or stabilizers can be added. These additives can be blockers, absorbers, or stabilizers. Blockers coat plastics with a protective layer to keep them safe from UV radiation. Carbon black and titanium dioxide are common and effective blockers. Absorbers, such as benzophenones and benzotriazoles, absorb UV light and emit less harmful wavelengths like heat. Stabilizers, such as hindered amine light stabilizers (HALS), turn excited UV reactions into stable chemical reactions.
By selecting the appropriate UV-resistant plastic and considering additives, manufacturers can create plastic products that are well-suited for outdoor use and can withstand the damaging effects of UV radiation.
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UV radiation's effects on plastic
Plastics are prone to UV damage, much like human skin. When exposed to ultraviolet radiation, plastics absorb it or produce free radicals that negatively affect the material's mechanical properties. This can lead to a reduction in mechanical strength, discoloration, reduced impact and tensile strength, and overall deformation of the material.
Some plastics, such as polypropylene and nylon, are highly susceptible to degradation by UV radiation and can become brittle after prolonged exposure, making them unsuitable for prolonged exposure to sunlight. To prevent this, additives such as stabilizers, absorbers, or blockers can be added to increase their UV resistance.
There are three main types of UV-resistant additives: blockers, absorbers, and stabilizers. Blockers coat plastics with a protective layer, preventing UV rays from reaching the plastic's polymers. Carbon black and titanium dioxide are common and effective blockers. Absorbers, such as benzophenones and benzotriazoles, absorb UV radiation and convert it into less harmful wavelengths, such as heat. Stabilizers, such as Hindered Amine Light Stabilizers (HALS), turn excited UV reactions into stable chemical reactions.
UV-resistant plastics, such as acrylic, HDPE, and polycarbonate, are ideal for outdoor use as they offer excellent UV resistance, increasing the lifespan of the product and preventing the effects of photodegradation. These plastics can also be used in combination with absorbers to maintain transparency. Additionally, protective seals or caps can be added to limit the effects of photodegradation and improve the longevity and aesthetics of the product.
Overall, while no plastic is entirely protected against UV rays, the use of UV-resistant plastics and additives can significantly increase their resistance and prevent the negative effects of UV radiation on the material.
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UV-resistant plastic applications
Plastics are prone to UV damage, which can lead to discoloration, reduced strength, and deformation of the material. Therefore, it is imperative to choose UV-resistant plastics for outdoor applications.
There are three main categories of UV-resistant additives: blockers, absorbers, and stabilizers. Blockers, such as carbon black and titanium dioxide, create a protective layer that shields plastics from UV rays. Absorbers, including benzophenones and benzotriazoles, absorb UV light and convert it into less harmful forms like heat. Stabilizers, such as hindered amine light stabilizers (HALS), help prevent photodegradation and its negative effects.
Some commonly used UV-resistant plastics include:
- Acrylic: Acrylic is inherently UV-resistant, with minimal degradation of around 3% over ten years. It is transparent, scratch-resistant, and popular for signage, displays, light fixtures, and replacements for glass. However, it is not very strong and is brittle, limiting its use in load-bearing applications.
- HDPE (High-Density Polyethylene): HDPE is a durable and versatile plastic that is easy to melt and mold. It is resistant to acids, alcohols, and bases, making it suitable for outdoor furniture, playground equipment, containers, and pipes.
- Polycarbonate: Polycarbonate is a strong and impact-resistant plastic, making it ideal for safety equipment like goggles, shields, and windows. It is also used in outdoor piping, fittings, seals, and gaskets.
- PTFE: PTFE is a fluoropolymer that combines carbon and fluorine, offering low friction and flexibility. It is commonly used in bearings, non-stick surfaces, and gaskets, often in outdoor applications.
- Polyetherimide (PEI): PEI is a UV-resistant plastic used in industrial and automotive applications. It is flexible, rigid, and has a high deflection temperature, and can be made transparent or translucent.
These UV-resistant plastics are used in a wide range of industries, including transportation, agriculture, construction, science, recreation, and consumer goods. When selecting a UV-resistant plastic, it is important to consider factors such as impact resistance, strength, transparency, weather resistance, and chemical resistance, depending on the specific application.
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Frequently asked questions
Plastics can be made UV resistant by adding UV stabilizers or UV-resistant caps to protect the base polymer. This prevents UV radiation from reaching the plastic's surface and causing damage such as discolouration, reduced strength, and overall deformation of the material.
Some plastics that are UV resistant include Acrylic, HDPE, Polycarbonate, PVDF, and PPS.
UV-protective plastics are used in a variety of settings, including outdoor furniture, automotive parts, medical equipment, and solar panels.
You can apply UV protection to plastic surfaces by using a UV protectant spray. These sprays form a protective barrier that blocks harmful UV rays, preventing discolouration, chalking, and brittleness.
