按标签归档 Adhesive

胶黏剂开发设计的基础知识

胶黏剂开发设计的基础知识 胶黏剂的定义：通过界面的粘附和物质的内聚等作用，能使两种或两种以上的制件或材料连接在一起的天然的或合成的、有机的或无机的一类物质，统称为胶黏剂（adhesive）又叫粘合剂，习惯上称为胶。（通过黏合作用。能使被粘物结合在一起的物质） 粘结（粘合）：指两个表面靠化学力、物理力或者两者兼有的力使之结合在一起的状态。 胶黏剂首先必须在被粘物表面粘附，这是由于两相之间产生粘合力，该力来源于次价键力或主价键力。 内聚：即单一物质内部各粒子靠主价键力（包括离子键、共价键、配位键、金属键等）、次价键力（包括范德华力、氢键）结合在一起的状态。胶黏剂的内聚力与分子间力、相对分子质量、交联程度、结晶和分子缠绕等因素有关。

松香

一 按松树品种分： 马尾松：以福建、两广居多。主要应用于松香树脂、热熔胶、造纸、油漆等行业，马尾松松香是目前产量最多的松香。 湿地松： 主要分布在江西。透明度较好，颜色较浅，与马尾松松香相比，颜色有点泛青。价格相对便宜，内销较多，油漆油墨、蜡染等行业较喜欢。 南亚松：主产地在海南，可惜产量少，每年只有2000多吨，畅销日本。 思茅松：集中分成在云南思茅。松香颜色有些泛红，但β-蒎烯含量比较高。 其它采脂树种：云南松、加勒比松、红松、油松，华山松、樟子松、落叶松等。

Adhesive Terminology – Z

Z (Impedance) – Variable for Electrical Impedance (The opposition a circuit offers to the flow of alternating current) expressed in ohms

Adhesive Terminology – Y

Yield – The percent of usable, defect-free lumber that can be cut from a rough cutting, board, or bundle of lumber. Yield value – The stress (either normal or shear) at which a marked increase in deformation occurs without an increase in load.

Adhesive Terminology – X

X (Reactance) – Variable for Electrical Reactance (Opposition to the flow of alternating current).

Adhesive Terminology – W

Warp – A significant variation from the original, true, or plane surface. Watt – A unit of electric power. The product of a volt times an ampere. Webbing – Filaments or threads that may form when adhesive transfer surfaces are separated. Wood failure – The rupturing of wood fibers in strength tests on bonded specimens, [...]

Adhesive Terminology – V

V-joint – A glue joint in which one side is thicker than the other as a result of poor machining or uneven application of pressure. Vacuum Press – A press designed for laminating or veneering in which the panel is placed inside of a flexible bag connected to a vacuum pump. Vapor Density – The [...]

Adhesive Terminology – U

Ultimate elongation – Elongation at failure. Ultraviolet light – Part of the light spectrum. Ultraviolet rays can cause chemical changes in rubbery materials. Urethane – A family of polymers ranging from rubbery to brittle. Usually formed by the reaction of a di-isocynate with a hydroxyl. UV – Ultraviolet Light.

Adhesive Terminology – T

Tack – The property of an adhesive that enables it to form a bond of measurable strength immediately after adhesive and substrate are brought into contact under low pressure. Same as aggressive tack. Tack range – The period of time in which an adhesive will remain in the tacky-dry condition after application to a substrate, [...]

Adhesive Terminology – S

Sandability – Sandability is a relative term used to explain the performance of dried glue when sanded. Good sandabilty is achieved when glue that has been sanded does not gum up the sanding belt. SARA – Superfund Amendments and Reauthorization Act. Saw Kerf – The saw blade thickness taken out by the saw as it [...]

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