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Sep 14, 2021
Silicone epoxy resin is made by condensation of low molecular weight polymethylphenylsiloxane and bisphenol A epoxy resin in the presence of a catalyst.
Light yellow to yellow uniform liquid, epoxy value 0.01～0.03mol/100g, solid content 50%. Viscosity (coating 4 cups, 25℃)≤30s. There are also solid organic silicon epoxy resins, yellow to brown solid, with a softening point of 60-80°C. The epoxy value is 0.25～0.35mol/100g. The epoxy resin adhesive is formulated with silicone epoxy resin, which not only has the heat resistance and water resistance of silicone polymer, but also maintains the high bonding strength of epoxy resin. It can be used in the temperature range of 250~300℃ .
Silicone modified epoxy resin is an effective way that has been developed in recent years to reduce the internal stress of epoxy resin, but also increase the toughness and high temperature resistance of epoxy resin. The compatibility of the two is the silicone modified ring The key to oxygen resin.
Basic classification
Classification standard
The classification of epoxy resin has not yet been unified. Generally, it is classified according to strength, heat resistance grade and characteristics. There are 16 main types of epoxy resin, including general-purpose adhesives, structural adhesives, high temperature resistant adhesives, low temperature resistant adhesives, water and wet surfaces. There are 16 types of glue, conductive glue, optical glue, spot welding glue, epoxy resin film, styrofoam, strain glue, soft material bonding glue, sealant, special glue, latent curing glue, and civil construction glue.
The classification of epoxy resin adhesives is divided into the following methods in the industry:
1. According to its main composition, it is divided into pure epoxy resin adhesive and modified epoxy resin adhesive;
2. According to its professional use, it is divided into epoxy resin adhesives for machinery, epoxy resin adhesives for construction, electronic epoxy resin adhesives, epoxy resin adhesives for repairs, and adhesives for traffic and ships. Wait;
3. According to its construction conditions, it is divided into normal temperature curing glue, low temperature curing glue and other curing glues;
4. According to its packaging form, it can be divided into single-component glue, two-component glue and multi-component glue, etc.;
There are other sub-methods, such as solvent-free glue, solvent-based glue and water-based glue. However, there are many applications based on component classification.
The excellent physical mechanical and electrical insulation properties of epoxy resin, the bonding properties with various materials, and the flexibility of its use process are not available in other thermosetting plastics. Therefore, it can be made into coatings, composite materials, casting materials, adhesives, molding materials and injection molding materials, and is widely used in various fields of the national economy.
Coating use
The application of epoxy resin in coatings accounts for a large proportion, and it can be made into varieties with various characteristics and uses. Its commonality:
1. Excellent chemical resistance, especially alkali resistance.
2. The paint film has strong adhesion, especially to metal.
3. Has good heat resistance and electrical insulation.
4. The paint film has better color retention.
However, the bisphenol A epoxy resin coating has poor weather resistance, and the paint film is easy to powder and lose gloss in the outdoor, and it is not suitable for outdoor coatings and high-decorative coatings. Therefore, epoxy resin coatings are mainly used as anti-corrosion paints, metal primers, and insulating paints, but coatings made of heterocyclic and cycloaliphatic epoxy resins can be used outdoors.