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密封胶形态分类

(2009-04-15 09:20:45)
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杂谈

    (1)膏状密封胶
  此类密封胶基本上用于静态接缝中,使用期一般为2年或2年以上。通常采用3种主体材料:油和树脂、聚丁烯、沥青。
  (2)液态弹性体密封胶
  此类密封胶包括经硫化可形成真正弹性状态的液体聚合物,它们具有承受重复的接缝变形能力。弹性体密封胶所使用的聚合物弹性体包括液体聚硫橡胶、巯端基聚丙烯醚、液体聚氨酯、室温硫化硅橡胶和低分子丁基橡胶等。该类密封胶通常配合成两个组分,使用时将两个组分混合。
  (3)热熔密封胶
  热熔密封胶又叫热施工型密封胶。指以弹性体同热塑性树脂掺合物为基料的密封胶。这类密封胶通常在加热(150~200℃)情况下经一定口型模型直接挤出到接缝中。热施工可改进密封胶对被粘基料的湿润能力,因此对大多数被粘基料具有良好的粘接力。一经放入适当位置,就冷却成型或成膜,成为收缩性很小的坚固的弹性体。热施工密封胶的主体材料主要是异丁烯类聚合物、三元乙丙橡胶和热塑性的苯乙烯嵌段共聚物。它们通常同热塑性树脂如EVA、EEA、聚乙烯、聚酰胺、聚酯等掺合。
  (4)液体密封胶
  该类密封胶主要用于机械接合面的密封,用以代替固体密封材料即固体垫圈以防止机械内部流体从接合面泄漏。该类密封胶通常以高分子材料例如橡胶、树脂等为主体材料,再配以填料及其它组分制成。液体密封胶通常分不干性粘着型、半干性粘弹性、干性附着型和干性可剥型等4类。根据具体使用部位及要求选择。

(1) sealant paste
Basically, such a sealant for static joints in general use for 2 years or 2 years. Used three kinds of main materials: oil and resin, polybutylene, asphalt.
(2) liquid elastomer sealant
Such sealants include the formation of sulfide can be really flexible polymer liquid state, they have to bear the ability to repeat the joint deformation. Elastomer sealant polymer used in elastomers, including liquid polysulfide rubber, thiol-terminated polypropylene ether, liquid polyurethane, RTV silicone rubber and butyl rubber, such as low molecular weight. Often with the kind of sealant into two components, using the two-component mixture.
(3) hot-melt sealant
Also known as hot-melt sealant sealant construction type. Refers to the elastomer Blends with the thermoplastic resin-based sealant material. This type of sealant often heated (150 ~ 200 ℃) under a certain population model by direct extrusion of the joints. Construction could be improved heat sealant viscosity on the sub base material, and therefore the majority of base material was sticky adhesive has good power. Add the appropriate place once, on cooling forming or film-forming, becoming a very small contraction of the solid elastomer. Heat of the main construction material sealant mainly isobutene polymer, EPDM rubber and thermoplastic styrene block copolymer. They are often the same thermoplastic resin such as EVA, EEA, polyethylene, polyamide, polyester and other admixtures.
(4) Liquid Sealant
Type of sealant used to seal mechanical joints used to replace the solid material or solid gasket sealed to prevent the machinery of internal fluid leakage from the joints. Type of sealant such as polymer materials are usually rubber, resin, such as the main material, together with fillers and other components made of. Liquid sealant is usually non-drying adhesive type of visco-elastic semi-arid, dry and dry adhesive peelable type 4. According to the specific use of the site and asked to select.


 

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