Master Bond manufactures a wide range of compounds for plastic bonding

Master Bond manufactures a wide range of adhesives for bonding plastics, as well as plastics to other substrates. Surface preparation plays a key role in ensuring that good bond strength is achieved. The following techniques are typically used as practices for good surface preparation:

脱脂

进行脱脂以从表面上除去任何松散的污垢或其他污染物。使用挥发性溶剂如甲苯,丙酮,甲基乙基酮,甲醇,异丙醇和三氯乙烯,表面可以脱脂。但是,请确保在选择溶剂之前满足所有环境,健康和安全法规。使用的最常用方法通常包括三个主要步骤:

  1. Vapor degrease/ clean/rinse the parts with the appropriate solvents
  2. 将衬底浸入溶剂的新鲜浴中进行洗涤,并在第二罐中浸入第二罐中进行冲洗
  3. 清洁和干燥基材柱后脱脂

磨损

The surfaces need to be degreased and cleaned before as well as after abrasion to remove any pre-existing contaminants on the surface. Once the surfaces have been abraded, they need to be degreased to remove the debris from abrasion. Depending on the exact plastic being used, the abrasion technique that is eventually employed might vary. Please note caution must be exercised based on the exact material used regarding the feasibility of this technique.
用砂纸粗糙化表面可以成功地用于许多塑料,例如PEEK,尼龙,聚烯烃等。以下是为粘接准备的Peek优惠券的照片。


粗糙化之前和之后的基质,放大以显示细节。

在表面粗糙度之前和之后的Peek优惠券,具有60个砂纸伴随部分粗糙的表面的放大图像。


Physical Methods

这些技术利用塑料的表面反应性并改变表面化学以实现更好的粘合性,而不是利用危险化学品。一些最常见的物理方法包括:

  1. Corona Discharge: The ionized air generated by a corona discharge, reacts with the surface of the substrate to form free radicals. They react with oxygen in the atmosphere and increase the surface energy of the substrate to be bonded.
  2. 火焰处理:火焰处理涉及将表面暴露于气体火焰待粘合几秒钟。火焰通过形成​​较高的表面能官能团来氧化待粘合的表面并增加表面能。使用此方法处理时,翘曲可能是潜在的障碍。
  3. Plasma Treatment: Plasma treatment differs from corona discharge and flame treatments in a sense that plasma treatment is typically carried out under partial vacuum. In plasma treatment, gas plasma is activated by the appropriate techniques to produce excited species that react with the plastic substrate. Often plasma treatment tends to provide substrates with better stability as compared to corona discharge, chemical treatment or flame treatment.
Since the shelf life of such surface treatment procedures can be short lived based on the substrate being treated, it might be a good processing procedure to treat the parts in line.

化学处理

已经开发了用于治疗不同底物的具体化学技术。这些处理改变了表面的物理和化学性质,以改善粘附性。betway必威登陆为此目的使用各种酸和碱。通常,将特定的化学物质或化学物质的混合物置于化学抗性容器中。然后将化学浴加热至适当的温度,将塑料浸入化学浴中以进行所需的时间。在化学处理表面之后,重要的是在用二水处冲洗表面并在进行进一步使用之前彻底干燥表面。处理化学品时应该特别小心。处理这些化学品时应该使用良好的实验室技能。人员应该穿着适当的个人防护装备,应该在处理这些化学品的情况下训练有素。

下表列出了通常用于一些最常用的塑料基材的化学处理:

基质 Etching Solution Composition (Wt%) 预处理条件
聚苯
Sulfide (PPS)
浓。Chromic Acid 100. Immersion: 2 min. @ 71°C
冲洗:自来水,然后是DI水
蒸发干燥
缩醛(Delrin) 浓。Chromic Acid (69%)
钠铬酸钠
Distilled Water
84.2
0.6
15.2
浸没:5分钟。@ 20°C
冲洗:自来水,然后是DI水
暖气
Nylon Aq. Phenol (80%) 100. Immersion: 15 - 20 min. @ 70°C - 90°C
冲洗:自来水,然后是DI水
Air Dry @ 60°C - 70°C
Acrylonitrile
Butadiene
苯乙烯(ABS)
浓。硫酸(69%)
钠铬酸钠
Distilled Water
84.2
0.6
15.2
浸没:20分钟。@ 60°C
冲洗:自来水,然后是DI水
暖气
Polytettra-
fluoroethylene
(PTFE)
Tetrahydrofuran
Naphthalene
Sodium
85.5
12.3
2.2
浸泡:1 - 2分钟。@ 70°C - 90°C
Rinse: Ketone followed by DI water
在温暖的空气中干燥65°C
聚乙烯
(PE)或
Polypropylene
(PP)
Plasma or Corona treatment
Alternatively, useX21.底漆
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A combination of degreasing, abrasion, and chemical treatment techniques can be employed for preparing plastic surfaces.

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