1. Dens

Formation reason: resin mixed such as oil or other insoluble liquid impurities.

Solution: Oil insoluble in resin, strict control of each link. Tools must be kept clean

Formation reason: the substrate is not dry enough or the surface of the substrate contains oily substances.

Solution: The substrate is not dry enough, will affect the uniform distribution of resin on its surface, so do a good job of baking the substrate. Surface cleaning can be used acetone or other volatile solvent appropriate wipe.

Causes: Environmental influences, such as air humidity.

Solution: Keep your work environment as dry as possible.

2. Eye of needle

Formation reason: gelation time is too fast.

Solution: Reduce the amount of accelerant and curing agent.

Cause: Too many solvents (including styrene) are added to the resin.

Solution: The resin can be diluted by styrene, and the amount is generally about 2%. Try not to add other solvents.

Formation reason: the substrate material is loose, the surface is rough.

Solution: pay attention to the selection of substrate and surface treatment.

Formation reason: exothermic peak is too low, resulting in bubbles not eliminated.

Solution: increase the proportion of curing agent appropriately.

3. Bubble

Formation reason: substrate is not dry enough. If the substrate is not dry enough, for a long time, water will precipitate, break through the binding force of the resin on the substrate, forming bubbling.

Solution: Bake as low as possible, bake enough time, minimize moisture content.

Formation reason: substrate surface is not treated clean, affecting the bonding force between resin and substrate. Local separation is easy.

Solution: After grinding the surface, use acetone or other volatile solvent appropriate wipe.

Formation reason: resin added does not participate in the reaction of solvent. After curing, the solvent remains in the resin, and then vaporized to separate the resin layer from the substrate.

Solution: The resin can be diluted by styrene, and the amount is generally about 2%. Try not to add other solvents.

Formation reason: grinding, polishing too early. The resin is not fully cured, which is easy to destroy the binding force between the resin and the substrate.

Solution: Resin polishing should be carried out 24 hours after curing.

4. Separation layer

Formation reason: gelation time is too fast, coating surface is too brittle, easy to fall off.

Solution: Adjust the dosage of accelerators and curing agents, and the gelling time is generally 30 minutes.

Formation reason: substrate surface is not treated clean.

Solution: After grinding the surface, use acetone or other volatile solvent appropriate wipe.

Formation reason: substrate humidity is high.

Solution: If the substrate is not dry enough, for a long time, water will precipitate through the capillary, break through the bonding force between the resin and the substrate, and separate the resin.

Formation reason: grinding, polishing too early, destroy the adhesion of resin to the substrate.

Solution: Resin polishing should be carried out 24 hours after curing.

5. Burst

Formation reasons: too fast gelation time, coating surface is too brittle, poor toughness.

Solution: Adjust the dosage of accelerators and curing agents, and the gelling time is generally 30 minutes.

Formation reason: temperature influence.

Solution: If the weather is cold, antifreeze resin should be used, such as 399, 399A.

6. Leveling difference

Formation reason: gelation time is too fast.

Solution: reduce the curing ratio.

Formation reason: substrate rough, grinding is not enough.

Solution: When making, the surface must be polished flat and treated clean.

7, the surface hardness is poor

Formation reason: curing agent dosage is not enough. The dosage of curing agent should not be too small, easy to cause poor curing, poor hardness, no wear-resisting phenomenon.

Solution: Use more accurate measuring tools, curing agent is generally kept above 1%.

Formation reason: curing agent quality is poor. The poor quality of curing agent will cause poor curing, poor hardness, no wear-resisting phenomenon.

Solution: Surface coating resin should use good quality curing agent, the use of auxiliary materials should be some basic performance tests to measure the quality of the material.

8, high viscosity

Formation reason: storage time is too long

Solution: Mix in 2% styrene or use as soon as possible.