Comprehensive knowledge of the use of adhesive II

3. Surface preparation

The strength of the adhesive joint is determined by the following factors
- Viscosity of solidified adhesives
- Viscosity between the adhesive and the surface to be bonded

Adhesion depends on the type of adhesive used. Adhesion is affected by electrostatic and chemical effects and depends greatly on surface preparation.

Appropriate preparation of the surface of the joint can obtain a good adhesion effect. Poor preparation or unprepared results can result in weak joints and even failure. It is best to start the bonding work after surface preparation as much as possible.

Surface preparation can be performed by one of the following pre-processing programs. (In order to increase the strength of the joint)

(1) Cleaning and degreasing, dust, butter, and lacquer spots have a good effect on adhesion.
(2) Cleaning, degreasing, and mechanical wear; mechanical wear increases and activates the contact surface of the engaging member.
(3) Cleaning, degreasing, and chemical pretreatment; chemical etching greatly improves the cohesion of the adhesive surface of the adhesive.

In addition to chemical etching, it is also possible to activate the surface with flame, electrical (discharge) or plasma pretreatment.

Depending on the properties of the joint material and the requirements of the joint, the pretreatment includes cleaning, degreasing and sanding. (See 3.1.1)

For the highest performance bonding, chemical, thermal, electrical or plasma pretreatments are performed.

If solvent bonding is required (see 4.1), no chemical corrosion is required, then clean, degrease, and fully sand with medium-grained sandpaper.

The programming for the surface preparation of Quadrant Engineering Plastics' materials and several other common materials is detailed below:

PS It goes without saying that when using chemicals, the operation must be careful. See Chapter 6 for safety measures.

3.1 General Engineering Plastics

3.1.1 ERTALON/NYLATRON and ERTALYTE
Hertlen, Nylph and Herterite

Clean the adhesive surfaces with isopropyl alcohol or any other suitable and effective “Oxido-Oxygen-Depleting Chemicals” cleaner.
Grind with medium grain (80-150) sandpaper.
Carefully remove oil again and remove loose particles with a clean soft brush.

3.1.2 ERTACETAL

Hersett

Method I

Clean the adhesive surfaces with isopropyl alcohol or any other suitable and effective “Oxido-Oxygen-Depleting Chemicals” cleaner.
Grind with medium grain (80-150) sandpaper.
Carefully remove oil again and remove loose particles with a clean soft brush.

Method II

Clean the adhesive surfaces with isopropyl alcohol or any other suitable and effective “Oxido-Oxygen-Depleting Chemicals” cleaner.
Soak in the following solvents for 5 minutes at room temperature
- Water
- Concentrated sulfuric acid* (density 1.849/CM)
- Potassium or sodium bicarbonate* 330pbw
184pbw
2pbw
Pbw = weight of the part or corrosion in 50°C acid * (85%) for 5 to 20 seconds Wash with cold cold running water, followed by running hot water.
Dry with hot air

Method III

Clean the adhesive surfaces with isopropyl alcohol or any other suitable and effective “Oxido-Oxygen-Depleting Chemicals” cleaner.
Dip for 10 to 20 seconds at 90-100°C in the following solvents
- Total Chlorine Dioxide*
- Dioxane*
- p - toluenesulfonic acid * 96pbw
3.7pbw
0.3pbw
Pbw = part weight

Place in a hot oven at 100 to 120°C for 30-60 seconds. Immediately after removing from the oven, rinse with hot (about 60°C) running water. Dry with hot air (to be continued)