瓦克液體硅膠LSR在消費(fèi)電子產(chǎn)品和可穿戴設(shè)備、AR/VR中的應(yīng)用
近年來,以手機(jī)、平板和可穿戴設(shè)備為代表的消費(fèi)電子產(chǎn)品進(jìn)入了發(fā)展快車道,產(chǎn)品創(chuàng)新水平和供給質(zhì)量不斷提升,成為消費(fèi)領(lǐng)域持續(xù)增長(zhǎng)的重要熱點(diǎn)。隨著產(chǎn)品功能和性能的不斷升級(jí),以及消費(fèi)者對(duì)外觀、手感、體驗(yàn)等品質(zhì)的要求越來越高,消費(fèi)電子產(chǎn)品對(duì)材料的性能和加工便利性要求也日益提高。
液體硅膠由于其固有的出色防水性能以及優(yōu)異的彈性、抗老化性、生物相容、生產(chǎn)效率高、可實(shí)現(xiàn)復(fù)雜形狀產(chǎn)品的制造等眾多優(yōu)勢(shì),一直以來被作為一種防水材料廣泛用于消費(fèi)電子產(chǎn)品領(lǐng)域。近年來,隨著更多功能性液體硅膠產(chǎn)品的開發(fā),其在消費(fèi)電子產(chǎn)品中的應(yīng)用也越來越多。
自粘型液體硅膠助力緊湊化設(shè)計(jì)
消費(fèi)電子產(chǎn)品的緊湊化設(shè)計(jì)對(duì)產(chǎn)品尺寸精度的要求越來越高,寬幅越來越窄,使得單個(gè)元件材料成本壓力相對(duì)減小,MIPG(2K LSR)技術(shù)運(yùn)用于塑料及金屬殼體密封逐漸取代傳統(tǒng)的FIPG 和CIPG,通過單次注膠成型實(shí)現(xiàn)多元化功能的設(shè)計(jì)構(gòu)想。
針對(duì)這一趨勢(shì),全球第二大有機(jī)硅制造商瓦克化學(xué)致力于提供配套的自粘型硅膠材料,使得硅膠固化成型時(shí)也與基材實(shí)現(xiàn)可靠的粘接。瓦克的自粘型硅膠材料能粘接大部分熱塑性材料和金屬基材,例如PA、PBT、PET、PMMA、PEEK、PC以及金屬Al件等,且不粘附常規(guī)模具內(nèi)表面的硬化鋼模,能夠通過共注射成型進(jìn)行加工,非常適合于硬/軟型復(fù)合材料應(yīng)用,可廣泛用于消費(fèi)電子產(chǎn)品的防水密封及結(jié)構(gòu)部件,實(shí)現(xiàn)精準(zhǔn)成型,無(wú)須底涂處理,簡(jiǎn)化工序,提高生產(chǎn)效率和產(chǎn)品可靠度。
瓦克自粘型硅膠材料家族成員眾多,包括通用型工業(yè)級(jí)、食品級(jí)以及醫(yī)療級(jí)系列,適用于針對(duì)PC、PA、PBT、PET、PMMA、PEEK的粘接。此外,還有特殊的阻燃、滲油、耐冷凍、耐油等產(chǎn)品,用于滿足不同環(huán)境的應(yīng)用需求。
根據(jù)ISO813標(biāo)準(zhǔn)進(jìn)行嚴(yán)苛的90度直角剝離測(cè)試,粘接面達(dá)到內(nèi)聚破壞的級(jí)別,從而長(zhǎng)期保持可靠粘接強(qiáng)度。
低摩擦材料實(shí)現(xiàn)舒適手感
3C及可穿戴設(shè)備的外觀手感也對(duì)實(shí)際使用體驗(yàn)帶來較大影響,手感爽滑、易清潔除塵的結(jié)構(gòu)件材料也日益受到市場(chǎng)的歡迎。瓦克針對(duì)這一市場(chǎng)需求,提供特殊的低摩擦系數(shù)液體硅膠材料,可廣泛用于腕帶、耳機(jī)護(hù)套以及外殼包覆等應(yīng)用,在讓消費(fèi)者佩戴更為舒適、輕便的同時(shí),也使得裝配更為快捷方便。
ELASTOSIL LR 3065是低摩擦系數(shù)等級(jí)材料的代表性工業(yè)級(jí)液體硅膠,其成型部件的顯著特點(diǎn)是一經(jīng)制成表面便具有低摩擦性。與標(biāo)準(zhǔn)液體有機(jī)硅相比,此產(chǎn)品的摩擦系數(shù)低50-70%,且其低摩擦效果并非由硅油從橡膠表面滲出而實(shí)現(xiàn)。ELASTOSIL LR 3065的成型部件無(wú)硅油滲出,無(wú)須手感油處理,同時(shí)可保持長(zhǎng)期持久的表面爽滑,具有優(yōu)異的觸感,兼具防污防塵,便于清潔,且具有優(yōu)異的機(jī)械性能,是兼具強(qiáng)韌物性以及低摩擦系數(shù)的理想選擇。
除了以上工業(yè)級(jí)材料之外,瓦克針對(duì)食品接觸以及醫(yī)療應(yīng)用的產(chǎn)品,同樣具有優(yōu)異的觸感和較低的滑動(dòng)摩擦系數(shù),為各種創(chuàng)新型產(chǎn)品設(shè)計(jì)提供豐富的材料選擇。
瓦克低摩擦系數(shù)等級(jí)材料在讓消費(fèi)者佩戴更為舒適、輕便的同時(shí),也使得裝配更為快捷方便。
高透硅膠呈現(xiàn)出色的光學(xué)效果
VR終端頭盔等可穿戴設(shè)備中對(duì)用戶沉浸感影響最大的部件是光學(xué)鏡片。目前此部件普遍使用PMMA材料注塑成型,但存在透光率稍低、易黃變、耐候性和耐輻射性較差、內(nèi)部應(yīng)力較大等問題,鏡片使用壽命較短,且影響VR效果,易造成視覺疲勞。
LUMISIL LR 7601是瓦克專為光學(xué)產(chǎn)品開發(fā)的高透明液體硅膠,其透光率高達(dá)96%, 遠(yuǎn)超PC的87%和PMMA的92%,可在很大程度上減少光學(xué)鏡片在使用過程中的因透明度引起的色彩失真度、反光性和清晰度對(duì)視覺感受的影響。此產(chǎn)品的折光率低,色散也低于PC和PMMA,可獲得高清晰度的成效效果,不容易引起視覺疲勞。
同時(shí),由于硅膠對(duì)氧氣/臭氧的耐抗性極高,長(zhǎng)期暴露在可見光和紫外線輻射環(huán)境中也不會(huì)受到影響,不會(huì)向PC和PMMA那樣遇熱或受光源/紫外線輻射變黃,因此用LUMISIL LR 7601即使長(zhǎng)期承受負(fù)荷,也能保持水晶般的透明。此外,其固化成型過程中基本無(wú)殘留應(yīng)力發(fā)生,不易引起鏡片變形與破裂,使用更為安全。由此,LUMISIL LR 7601是消費(fèi)電子產(chǎn)品和可穿戴設(shè)備呈現(xiàn)出色光學(xué)效果的理想選擇。
用瓦克高透硅膠制成的杯子
https://new.qq.com/omn/20201020/20201020A01GUD00.html
https://www.abvr360.com/a/1727
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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 nD?? 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.
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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
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https://www.wacker.com/cms/en-us/products/applications/electrics/lighting/lighting.html
