Do you know the classification of silicone pressure-sensitive adhesive? Silicone pressure-sensitive adhesive has good bonding strength and initial viscosity of general pressure-sensitive adhesive. Although it has a small share in the whole market, it is an irreplaceable adhesive in many special applications. Do you know the application classification of silicone pressure-sensitive adhesive?
There are four main types of silicone pressure sensitive adhesive, including solvent type, high solid content type, solvent-free type, hot-melt type and lotion type silicone pressure sensitive adhesive.
1. Solvent based silicone pressure-sensitive adhesive
The solvent silicone pressure-sensitive adhesive is the most developed, which can meet many practical needs and has excellent performance. The solvents used are toluene, xylene and petroleum ether. Although the performance of solvent based silicone pressure-sensitive adhesive is excellent, its further development is limited due to its low solid content, the need to use a lot of solvents, consuming a lot of raw materials and energy and causing environmental pollution.
2. High solid content and solvent-free silicone pressure sensitive adhesive
In order to meet the requirements of environmental protection and reduce the use and emission of volatile organic compounds (VOC) that pollute the air, high solid content and solvent-free silicone pressure-sensitive adhesives are gradually developed. The remarkable advantage of high solid content system is that it only requires a small amount of or no solvent dilution, has extensive performance, is easy to mix, and requires simple production equipment. It can also be well coated and cured on the traditional low solid content adhesive coater, and is convenient to handle and store.
3. Hot melt silicone pressure-sensitive adhesive
The advantages of hot-melt silicone pressure sensitive adhesive are: no organic solvent, safety, environmental protection, convenient construction, and can be coated with traditional equipment, low cost, no pollution.
4. Lotion silicone pressure sensitive adhesive
There are few reports on pure lotion silicone pressure-sensitive adhesive, because organic surfactant needs to be added when preparing silicone pressure-sensitive adhesive lotion, which will have adverse effects on many properties of pressure-sensitive adhesive.
The application of silicone pressure-sensitive adhesive is mainly in the following two aspects:
1. Industrial applications
The silicone pressure-sensitive adhesive tape is widely used in industrial production in the form of splicing tape, electrical tape, plasma spraying tape, machining tape, etc. because of its good high and low temperature resistance, chemical resistance and low dielectric properties, and its ability to bond low surface energy surfaces. The surface of many substrates is difficult to bond, such as polyester, polyimide and polytetrafluoroethylene. Before the application of pressure-sensitive adhesive, the substrate surface needs to be treated by chemical, electrical or plasma methods or a layer of primer is coated on the substrate surface to make the silicone pressure-sensitive adhesive bond with the substrate more firmly.
2. Applications in Electronics
In electronics, silicone pressure-sensitive adhesive and its tape are generally used in the production and assembly of printed circuit boards (PCB). This requires pressure-sensitive adhesive not only to withstand high temperature (270 ℃ for a short time), bonding wet low surface energy interface, but also to have low dielectric properties. The silicone pressure-sensitive adhesive is also widely used in the protective coatings of electronic components. These protective coatings are composed of multi-layer structures, and each layer endows the protective coatings with unique properties.
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