1.Optimize quartz surface pre-treatment
Fully dry quartz powder to remove surface free moisture, remove dust and impurity ions, expose sufficient active hydroxyl groups, lay foundation for chemical bonding with resin.
2.Use matched silane coupling agents
– Epoxy resin: adopt amino silane / epoxy silane
– Unsaturated resin: use vinyl silane
– Silicone resin: choose methyl silane
Coupling agent forms Si-O-Si bond with quartz and organic chain bond with resin, build firm molecular bridge.
3.Control reasonable modifier dosage
Best dosage: 1.0%–2.5% of quartz weight. Too little causes weak bonding; excess leads to interface separation and lower strength.
4.Standardize modification reaction conditions
Control mixing temperature 80–120℃ and reaction time 30–60 min, ensure uniform coating and complete reaction on quartz surface.
5.Optimize quartz particle gradation
Mix coarse and fine quartz powder reasonably to reduce internal gaps, increase contact area between filler and resin, enhance physical filling bonding.
6.Eliminate powder agglomeration
Adopt high-speed dispersion or mechanochemical treatment to disperse ultrafine quartz evenly, avoid agglomeration causing poor resin infiltration.
7.Improve mixing uniformity
Adopt segmental feeding and high-shear stirring, make quartz fully infiltrated and wetted by resin, no dry powder inside the compound system.
8.Adjust resin curing process
Control slow heating curing speed, reduce internal shrinkage stress, avoid interface cracking, keep stable bonding strength.
9.Reduce quartz surface inert impurities
Remove free silica ash and inert mineral impurities, reduce isolation layer between quartz and resin interface.
