瓦克液体硅胶LSR在消费电子产品和可穿戴设备、AR/VR中的应用


近年来,以手机、平板和可穿戴设备为代表的消费电子产品进入了发展快车道,产品创新水平和供给质量不断提升,成为消费领域持续增长的重要热点。随着产品功能和性能的不断升级,以及消费者对外观、手感、体验等品质的要求越来越高,消费电子产品对材料的性能和加工便利性要求也日益提高。

液体硅胶由于其固有的出色防水性能以及优异的弹性、抗老化性、生物相容、生产效率高、可实现复杂形状产品的制造等众多优势,一直以来被作为一种防水材料广泛用于消费电子产品领域。近年来,随着更多功能性液体硅胶产品的开发,其在消费电子产品中的应用也越来越多。

自粘型液体硅胶助力紧凑化设计

消费电子产品的紧凑化设计对产品尺寸精度的要求越来越高,宽幅越来越窄,使得单个元件材料成本压力相对减小,MIPG(2K LSR)技术运用于塑料及金属壳体密封逐渐取代传统的FIPG 和CIPG,通过单次注胶成型实现多元化功能的设计构想。

针对这一趋势,全球第二大有机硅制造商瓦克化学致力于提供配套的自粘型硅胶材料,使得硅胶固化成型时也与基材实现可靠的粘接。瓦克的自粘型硅胶材料能粘接大部分热塑性材料和金属基材,例如PA、PBT、PET、PMMA、PEEK、PC以及金属Al件等,且不粘附常规模具内表面的硬化钢模,能够通过共注射成型进行加工,非常适合于硬/软型复合材料应用,可广泛用于消费电子产品的防水密封及结构部件,实现精准成型,无须底涂处理,简化工序,提高生产效率和产品可靠度。

瓦克自粘型硅胶材料家族成员众多,包括通用型工业级、食品级以及医疗级系列,适用于针对PC、PA、PBT、PET、PMMA、PEEK的粘接。此外,还有特殊的阻燃、渗油、耐冷冻、耐油等产品,用于满足不同环境的应用需求。

根据ISO813标准进行严苛的90度直角剥离测试,粘接面达到内聚破坏的级别,从而长期保持可靠粘接强度。

低摩擦材料实现舒适手感

3C及可穿戴设备的外观手感也对实际使用体验带来较大影响,手感爽滑、易清洁除尘的结构件材料也日益受到市场的欢迎。瓦克针对这一市场需求,提供特殊的低摩擦系数液体硅胶材料,可广泛用于腕带、耳机护套以及外壳包覆等应用,在让消费者佩戴更为舒适、轻便的同时,也使得装配更为快捷方便

ELASTOSIL LR 3065是低摩擦系数等级材料的代表性工业级液体硅胶,其成型部件的显著特点是一经制成表面便具有低摩擦性。与标准液体有机硅相比,此产品的摩擦系数低50-70%,且其低摩擦效果并非由硅油从橡胶表面渗出而实现。ELASTOSIL LR 3065的成型部件无硅油渗出,无须手感油处理,同时可保持长期持久的表面爽滑,具有优异的触感,兼具防污防尘,便于清洁,且具有优异的机械性能,是兼具强韧物性以及低摩擦系数的理想选择。

除了以上工业级材料之外,瓦克针对食品接触以及医疗应用的产品,同样具有优异的触感和较低的滑动摩擦系数,为各种创新型产品设计提供丰富的材料选择。


瓦克低摩擦系数等级材料在让消费者佩戴更为舒适、轻便的同时,也使得装配更为快捷方便。

高透硅胶呈现出色的光学效果

VR终端头盔等可穿戴设备中对用户沉浸感影响最大的部件是光学镜片。目前此部件普遍使用PMMA材料注塑成型,但存在透光率稍低、易黄变、耐候性和耐辐射性较差、内部应力较大等问题,镜片使用寿命较短,且影响VR效果,易造成视觉疲劳。

LUMISIL LR 7601是瓦克专为光学产品开发的高透明液体硅胶,其透光率高达96%, 远超PC的87%和PMMA的92%,可在很大程度上减少光学镜片在使用过程中的因透明度引起的色彩失真度、反光性和清晰度对视觉感受的影响。此产品的折光率低,色散也低于PC和PMMA,可获得高清晰度的成效效果,不容易引起视觉疲劳。

同时,由于硅胶对氧气/臭氧的耐抗性极高,长期暴露在可见光和紫外线辐射环境中也不会受到影响,不会向PC和PMMA那样遇热或受光源/紫外线辐射变黄,因此用LUMISIL LR 7601即使长期承受负荷,也能保持水晶般的透明。此外,其固化成型过程中基本无残留应力发生,不易引起镜片变形与破裂,使用更为安全。由此,LUMISIL LR 7601是消费电子产品和可穿戴设备呈现出色光学效果的理想选择。


用瓦克高透硅胶制成的杯子

https://new.qq.com/omn/20201020/20201020A01GUD00.html

https://www.abvr360.com/a/1727

Properties

The products can be used at temperatures down to -55 °C and even above +150 °C. The outstanding optical transparency extends over a broad range of the visible spectrum and exceeds the transparency of polycarbonate or polymethylmethacrylate. The refractive index nD₂₅ is in the range of 1.41. LUMISIL® LR 7601/70 A/B is optimized for state-of-the-art requirements of optical parts. In contrast to standard ELASTOSIL® LR grades, the hardness in the product name of LUMISIL® LR 7601/70 A/B reflects the hardness of vulcanized articles in the non-post cured state. Depending on the injection molding parameters, the geometry of the final parts and the post curing conditions, hardness increases after post curing in the range of 5 to 8 points. In addition LUMISIL® LR 7601/70 A/B is listed in various UL (Underwriter Laboratory) standards including f1 rating, i. e. suitable for outdoor use with respect to exposure to Ultraviolet Light, Water Exposure and Immersion in accordance with UL 746C.

LUMISIL®LR 7601/70 A/B meets selected test requirements of ISO 10993 and United States Pharmacopoeia (USP) Class VI. It is designed for medical applications in compliance with the WACKER SILICONES HEALTH CARE POLICY.

 Specific features of LUMISIL® LR 7601/70 A/B

  • Food-contact
  • Highly transparent
  • Low volatile
  • Reduced volatile content

 


Secondary Optics

Highly transparent LUMISIL® liquid silicone rubber is used in lighting technology to produce optical lenses, sensors and optical coupling elements. LUMISIL® products for secondary optics can be processed economically by injection molding and so support low-cost mass-production of complex optical components.

Highly transparent, room-temperature-curing ELASTOSIL® RTV silicone rubber compounds serve as optical encapsulants for, e.g., LED strips while special ELASTOSIL® grades are used for SOG (silicone on glass) applications.

Advantages of LUMISIL® in Secondary Optics:

  • Highly heat resistant - up to 180 °C
  • Great low-temperature flexibility - down to -50 °C
  • Excellent weathering and UV resistance
  • Very good chemical resistance
  • Outstanding dielectric properties that remain largely constant over a wide range of temperatures and frequencies
  • Water-repellent surfaces and low moisture absorption
  • Low modulus of elasticity
  • High chemical purity

Advantages of Injection Molding

  • Greater productivity - highly automated, no assembly required
  • Efficient process - short cycle times, no secondary finishing of parts, highly reliable
  • Maximum quality - less risk of damage during production
  • Simplified logistics - one article drawing, one processor, one quality control, one article number

https://www.wacker.com/cms/en-us/products/applications/electrics/lighting/lighting.html

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