Frequently Asked Questions and Answers for Instant Dry Adhesive on Chinese Glue Website 123
Firstly, explain the principle of instant dry adhesive curing:
The curing process of instant adhesive:
1. Acidic stabilizers prevent molecular reactions, thereby keeping the adhesive liquid. 2. Weak alkaline ions of surface moisture neutralize the acidic stabilizer. 3. Aggregation begins. 4. Many interwoven polymer chains are formed, which are weakly alkaline anion curing
DM Adhesive Warm Reminder:
The humidity of the environment and the substrate used for bonding can have an impact on the instant drying adhesive; At the same temperature, different substrates will have different fixation times, and accelerators can be used to improve the fixation time of different substrates; The gap between adhesives can affect the curing speed, and the use of accelerators can accelerate curing, allow for larger gaps, and facilitate deep curing;
Some common questions about instant glue have been summarized:
1. What is glue whitening problem?
After the partial evaporation of cyanoacrylate molecules, they react with the surrounding water and fall, leaving behind white powdery residues that are whitened or frosted. There are multiple methods to avoid whitening, such as ensuring sufficient air flow in the assembly area, using less adhesive, or accelerating the curing speed.
2. Why is the surface insensitive when using quick drying glue?
Quick drying glue is acid stable and requires weak alkalinity (such as water) to react. So acidic substrates (such as paper and zinc dichromate steel) or residues (such as vinegar) can slow down or even inhibit the curing of quick drying adhesives.
3. Can some solvents/chemicals affect instant glue?
In general, cyanoacrylate adhesives have excellent resistance to non-polar solutions such as engine oil, ether, and toluene, but their resistance to strongly polar solutions such as caustic soda, acetic acid, acetone, etc. is very poor.
4. When should instant dry adhesive primer be used?
Instant dry adhesive primer is a solvent based product that can be applied to “inactive” surfaces before using adhesives to promote bonding strength (not curing speed). It is necessary to give the primer a period of time for the solvent carrier to evaporate from the substrate before using the cyanoacrylate adhesive (usually<1 minute).
5. When should I use instant glue accelerator?
Instant dry adhesive promoter is a solvent based product used before and after the use of adhesives to improve the curing speed and void filling ability of cyanoacrylate adhesives. They are very useful in extremely cold and dry winters.
6. What is stress cracking and what are the causes?
Untreated liquid instant dry adhesive residue on some plastic substrates (such as polycarbonate, acrylic ester, and polysulfone) may cause cracks to form on the plastic under pressure. Some measures to avoid/reduce stress cracking include quickly completing bonding, using reinforced grade plastics, reinforcing plastics, using accelerators or light (only applicable to Flashcure products) to accelerate curing speed.
7. Why is it not recommended to use instant glue on glass?
When using instant adhesive to bond glass, the initial strength is very high, but the strength will significantly decrease over time. Due to the characteristics of glass, it has a very fast curing speed and immediately forms huge stresses on the adjacent glass at the molecular level. This high stress causes the cured polymer around the bonding line to undergo chemical and physical damage or moisture damage due to temperature changes after a period of time, resulting in shrinkage and expansion. When the substrate is glass, permanent bonding cannot be achieved.
Application of instant dry adhesive:
Adhesive bonding of plastics and rubber, metal to metal bonding, medical applications, and electronic product components; It can also be used for bonding instruments, instrument parts, making arts and crafts, bonding rubber seals and frames, such as refrigerators and freezers; Temporary processing is used for fixing and positioning, such as cutting crystals, bonding medical equipment, electronic product parts, etc
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This article is included in Baidu Wenku
