最近经常碰到很多客户咨询常温固化的胶水，其实如果需要常温固化有要求很快速的话，UV胶是一个好选择，但是需要添加专门的设备而且要求粘接物至少要一边是透明以便紫外线的照射。另外比较多的可以用瞬干胶或者厌氧胶产品，当然对粘接方式也同样提出了一些要求。再其次是使用一些溶剂胶水（一般在电子行业不多见，在包装、制鞋等行业非常普遍），但必须要考虑通风以及溶剂的挥发性毒性等问题。以上很多都应该属于非结构性的粘接。而现实中最常用的应该是双组分的粘接剂了，也就是俗称的AB胶，以环氧体系和丙烯酸体系为主，而且这类胶水往往能起到结构粘接的作用（参看《关于结构胶粘剂和非结构胶粘剂》）。而电子行业比较常见的有DEVCON的14167系列，以及3M公司的DP810系列等。最近有个客户咨询3M DP420系列的结构胶粘剂，下载相关TDS资料学习了一下(这里面重点强调了各种粘接材料的表面处理问题），有兴趣的朋友可以下载附件查看：
Technical Data September, 1997
(Supersedes December, 1994)
Product Description Scotch-Weld™ DP-460 and Scotch-Weld™ DP-420 Epoxy Adhesives are high performance, two-part epoxy adhesives offering outstanding shear and peel adhesion, and very high levels of durability.
| Features | • High shear strength | • Controlled flow |
| • High peel strength | • 60 minute worklife (DP-460 Adhesive) | |
| • Outstanding environmental performance | or | |
| • Easy mixing | • 20 minute worklife (DP-420 Adhesive) |
Typical Uncured
Physical Properties
Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes.
| Product | DP-460Adhesive | DP-420Adhesive |
| Viscosity (approx..) Base@ 73°F (23°C) Accelerator | 80,000 cps10,000 cps | 80,000 cps10,000 cps |
| Base Resin Base
Accelerator |
epoxy amine |
epoxy amine |
| Color Base
Accelerator |
white amber |
white amber |
| Net Weight BaseLbs./Gallon Accelerator |
9.4 9.0 |
9.4 9.2 |
|
Mix Ratio (B:A) Volume Weight |
2:1 2:0.96 |
2:1 2:0.98 |
|
Worklife, 73°F (23°C) 20 g mixed 10 g mixed 5 g mixed |
60 minutes75 minutes
90 minutes |
15 minutes20 minutes
30 minutes |
Typical Cured
Thermal Properties
Note: The following technical information and data should be considered representative or typical only and should not be used for specification purposes.
| Product | DP-460Adhesive |
DP-420 Adhesive |
| PhysicalColor | Opaque, off-white | Opaque, off-white |
| Shore D Hardness |
75-80 |
75-80 |
| ThermalCoefficient of Thermal Below Tg Expansion Above Tg (in./in./°C) | 59 x 10-6
159 x 10-6 |
85 x 10-6
147 x 10-6 |
| Thermal Conductivity(btu – ft./ft.2 – hr. – °F) @ 45°C |
0.104 |
0.104 |
| ElectricalDielectric Strength (ASTM D 149) | 1100 volts/mil | 690 volts/mil |
| Volume Resistivity (ASTM D 257) | 2.4 x 1014 ohm-cm | 1.3 x 1014 ohm-cm |
Handling/Application
Information
Directions for Use
Scotch-Weld™ DP-460 and DP-420 Epoxy Adhesives are supplied in dual syringe plastic Duo-Pak cartridges as part of the 3M EPX™ Applicator System. The Duo-Pak cartridges are supplied in 37 ml, 200 ml and 400 ml configurations. To use the 37 ml cartridge simply insert the Duo-Pak cartridge into the EPX Applicator and start the plunger into the cylinders using light pressure on the trigger. Next, remove the Duo- Pak cartridge cap and expel a small amount of adhesive to be sure both sides of the Duo-Pak cartridge are flowing evenly and freely. If simultaneous mixing of Part A and Part B is desired, attach the EPX mixing nozzle to the Duo-Pak cartridge and begin dispensing the adhesive.
With the 200 ml and 400 ml cartridges the nozzle must be attached before dispensing any material to prevent unmixed adhesive from getting into the applicator cartridge holder. A small quantity of material should be discarded until uniform color, consistency of product and even flow is evident.
When mixing Part A and Part B manually (Scotch-Weld 460 B/A Epoxy Adhesive or Scotch-Weld 420 B/A Epoxy Adhesive), the components must be mixed in the ratio indicated in the Typical Uncured Properties Section of this Technical Data Sheet (page
1). Complete mixing of the two components is required to obtain optimum properties.
Two-part mixing/proportioning/dispensing equipment is available for intermittent or production line use. These systems are ideal for line uses because of their variable shot size and flow rate characteristics and are adaptable to most applications.
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