광학 액상 실리콘 고무:몰딩의 새로운 고정 장치
프로토타입 및 생산 부품을 위한 많은 제조 공정과 재료를 제공합니다. 그러나 하나의 공정에는 광학 액상 실리콘 고무와 같이 나머지 공정과 분리되는 재료가 있습니다. (OLSR). OLSR은 조명 및 광학 부품용으로 폴리카보네이트(PC) 및 아크릴(PMMA)보다 선호되는 소재로 만드는 많은 특성을 가진 고급 소재입니다. 다음은 OLSR이 제공하는 몇 가지 이점입니다.
광선 투과
빛이 물질을 통과할 때 빛 투과율이 손실됩니다. PC, PMMA 및 유리조차도 유리가 최대 95%, PMMA가 약 93%, PC가 88~90%인 광 손실이 있습니다. 제품에 투명 PC 또는 PMMA 부품이 필요한 경우 최대 94%의 광 투과율을 유지하는 OLSR을 사용하여 광 투과율을 개선할 수 있습니다. 굴절률은 어떻습니까? OLSR은 각각 1.58 및 1.49인 PC 및 PMMA와 비교할 때 1.42의 낮은 굴절률을 가집니다.
| | 실리콘 | PC | PMMA | 유리 |
|---|
| 광선 투과 | 94% | 88-90% | 93% |
95% |
| 굴절률 | 1.42 | 1.58 | 1.49 |
1.52 |
| 자외선 저항 | 높음 | 낮음 | 보통 |
높음 |
| 내화학성 | 높음 | 보통 | 낮음 |
높음 |
| 온도 | >150°C | 120°C | 90°C |
>200°C |
| 노란색 | 아니오 | 예 | 예 |
아니요 |
| 마이크로 디테일 | 예 | 아니오 | 아니오 |
아니요 |
| 두꺼운 부분 | 예>1인치 | 아니요 | >PC |
예 |
| Minimum Part Thickness | <0.020 in. | 0.040 in | 0.040 in |
- |
Still another advantage is the non-yellowing factor. Thermoplastics without additives are not UV resistant, which means the parts could yellow and degrade over long exposures to lights and sunlight. OLSR is non-yellowing so it’s great for outdoor fixtures exposed to harsh environments. Heat and Chemical Resistance Because OLSR is durable under temperatures that may be close to exceeding 300°F (150°C), and able to withstand many chemicals that may break down thermoplastics, you can use OLSR in high-power light fixtures, solar power, outdoor fixtures, LED lighting, cleaning fixtures, and many other environments where PC and PMMA may fail.
Injection Molding Resilience
In plastic design, thick and thin parts are not easily achieved without sacrifice. That doesn’t necessarily ring true with OLSR design. You can achieve thick and thin geometries that oftentimes can be as thin as 0.010 in. (0.25mm) and as thick as 2 in. (50mm), all within the same part geometry because you don’t have issues with material flow, sink, or voids.
OLSR is extremely resilient against the molding issue that frequently create problems with thermoplastics, including the ability to create micro details. You also can design in negative draft angles without the need for expensive tooling that normally requires lifters, collapsible cores, and side-actions.
When to Use
As you learn about the benefits of OLSR, the applications where you can use OLSR are numerous:
- Reducing part count in your design with built-in gaskets
- Lenses of all types
- Lightpipes or guides
- Marine and wet environments
- Outdoor and indoor light fixtures
- Low- and high-heat environments
- High impact parts
To learn more about optical liquid silicone molding and other molding, machining, and 3D printing services at Protolabs, visit protolabs.com . You can also contact us at [email protected] or 877.479.7541 to speak with one of our knowledgeable applications engineers.
