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  • 玻璃态转换温度, Glas transition temperature

    玻璃态转换温度(TG) 是胶水变脆时的温度。应用温度显然要高于胶水的玻璃态转换温度 (如 可重复揭开的袋子存储在冰箱里,可以防止袋子的重新闭合)

     

    The glass transition temperature (TG) is the temperature at which the adhesive becomes brittle. It is important that the application temperature is distinctly above the TG of the adhesive (e.g. resealable bags that are stored in the fridge or freezer as it can prevent a safe reclosure of the bag).


  • 硬胶, Hard adhesive

    通常用来描述高内聚力的压敏胶带。

    优点(相比软胶):

    高的保持力

    承受较高的重量

    好的耐温性

    较少的溢边

    有助于提高模切性能

     

    缺点:

    低初粘性和粘接力

    需要更高的压力

    不适合粗糙表面

     

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    Term usually used to characterize highly cohesive PSA tapes.

    Advantages (compared to soft adhesives):

    higher holding power withstands

    higher sustained loads good temperature resistance

    less edge picking

    improved die cuttability

     

    Disadvantages:

    low initial tack and adhesion;

    requires higher contact pressure

    not suited for rough surfaces


  • 热熔压敏胶, Hot melt pressure-sensitive adhesive

    可以不使用溶剂或水涂布的压敏胶水的类型。现在合成橡胶和丙烯酸的压敏胶可以做热熔涂布。

    Types of pressure sensitive adhesive that can be coated without use of solvents or water. Today PSA tapes based on synthetic rubber as well as acrylics are available for hot melt coating.


  • 耐湿性, Humidity resistance

    水气甚至是湿气可以影响胶水的性能。尤其应用于有水或者潮湿的环境中,胶水会吸潮,将导致粘接效果降低。这样的影响尤其会发生在水性丙烯酸胶水,此类胶水不适合在潮湿的环境中使用。

    Moisture or even humidity can affect the performance of an adhesive. Especially if applied under wet or very humid conditions the adhesive absorbs the humidity, which leads to reduced adhesion performance. This effect occurs especially with water-based acrylics, which should not be used under those conditions.

    总体来说压敏胶具有耐湿性,可以抵抗接触到的潮湿的空气或甚至是水而不会对粘接效果有负面影响。

    In general a PSA tape is humidity resistant when it resists contact with humid air or even water without negative effects on the adhesion properties 

    所有的丙烯酸具有很好的耐湿性。潮湿可以影响纸质离型纸并导致胶带表面起泡。基本上,塑料薄膜离型纸相比纸质的尺寸稳定。

    All acrylics have a good humidity resistance. Humidity can damage paper liners and lead to “bubbles” on the surface of the tape. Basically, filmic liners are more dimensionally stable than paper ones.

     

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  • 离型纸, liner

    不容易粘接的材料覆盖在大多数的双面胶带和一些单面胶带上,保护胶带不会自身粘在一起。离型纸在操作/制程和存储中被用于保护层。最常用的离型纸的类型有:

    1. 纸质离型纸(如 格拉辛纸, PE涂层纸, 粘土涂层纸)

    2. 塑料薄膜离型纸(如 聚丙烯,聚酯,聚乙烯) 硅被用作离型剂避免离型纸与胶水粘接在一起。

     

    Anti-adhesive material which covers the adhesive on almost all d/s and some s/s tapes and prevents the adhesive from sticking to itself. The liner is used as a protection aid during handling/processing and storage. Most commonly used liner types are

    1. Paper liners (e.g. Glassine paper, PE-coated paper, Clay-coated paper)

    2. Film liners (e.g. PP, PET, PE) Silicone is used as release system to avoid adhesion between liner material and adhesive.

     

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  • 转移, migration

    当两个表面接触在一起,一种组分从一个表面转移到另一个表面长期的分子运动。转移可能发生在胶带与被应用的表面之间。某些塑料薄膜(如PVC)包含增塑剂,可能转移到胶带胶水上,引发胶水变软。其他的成分例如发泡剂,硫化剂,应用于柔软的封条上的抗老化剂可以转移到胶带上危害粘接效果。

     

    The molecular movement over a long period of time of an ingredient from one surface to another when both are in contact. Migration may occur between tape components and the surface to which applied. Some plastic films (e.g. PVC) contain plasticizers which are apt to migrate into the tape adhesive, causing the adhesive to soften. Other ingredients like foaming, vulcanisation, age-resistant agents used for flexible seals migrate into the tape and can compromise the bond.


  • 非极性材料, Non-polar substrates

    因为低表面能而难以粘接的表面。较低的表面能,较低的分子吸引力。典型的材料是聚烯烃,如聚丙烯和聚乙烯,聚苯烯,乙烯-乙烯乙酯共聚物和很多粉末喷涂表面。通过表面处理(如光晕处理),极性可以被改变至较高的表面能,提高粘接效果。使用底涂剂也可以作为粘接助剂。

    Critical surfaces to adhere to due to low surface energy. The lower the surface energy the lower the molecular attraction to the adhesive (adhesion). Typical materials are polyolefins such as PP and PE, but also PS, EVA and many powder painted surfaces. By surface pretreatment (e.g. corona treatment) the polarity can be modified to achieve higher surface energy and improved adhesion. Use of primers will also act as adhesion promoters.


  • 挥发性, Outgassing

    化学成分从胶水中挥发出来(如单体残余物, 溶剂等)尤其在高温情况下。化学残余物可能出现的影响在汽车,航空和电子行业中经常是一个问题。 

    Amount of chemical ingredients evaporating from adhesives (e. g. monomer residues, solvents, etc.) especially under elevated temperature conditions. Often a concern in the Automotive, Aerospace and Electronics industries, where chemical residues could affect e. g. electric circuits.

     

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  • 极性材料, Polar substrates

    因为高的表面能而相对容易粘接的表面。在这些被粘物上,在胶水和被粘物中间高的分子吸引力会增加粘接强度。最常见的材料有PET, PC, PVC, ABS,钢板,铝,玻璃等。

    Uncritical surfaces to adhere to due to high surface energy. On these substrates the high molecular attraction between adhesive and substrate leads to increased adhesion. Most common materials are PET, PC, PVC, ABS, steel, aluminum, glass etc.


  • 底涂剂, Primer

    一种涂层先于胶水使用前应用于表面(如基材或者被粘物表面),提高基材和胶水或者胶带和被粘物表面之间的粘接效果。

    A coating applied to a surface (e. g. backing or a substrate) prior to the application of an adhesive, improving bond performance between backing and adhesive or between tape and substrate


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