New application directions and characteristics of adhesives(1)
New Applications for Adhesives
- 1. Anti-corrosion of mechanical equipment
At present, the steam pipes of equipments are mostly insulated with aluminum silicate and asbestos. However, due to leakage or alternating hot and cold, condensed water is generated and gathered on the outer wall of the steam pipe at the bottom layer. In addition, the steam pipe is subjected to high temperature and soluble salt for a long time, and the outer wall is seriously corroded. For this reason, a water glass series adhesive can be used as a coating material on the bottom layer of aluminum silicate to form a coating with an enamel-like structure. Its thermal expansion coefficient is similar to that of the pipe, with small thermal stress and no cracking. In mechanical installation, components are often fixed with bolts.
Components fixed by bolts will be exposed to air for a long time, which will cause crevice corrosion. During the operation of the machine, the bolts may sometimes loosen due to severe vibration. To solve this problem, the connecting components can be bonded with inorganic adhesives before connecting with bolts during mechanical installation. This can not only play a role in reinforcement, but also have an anti-corrosion effect.
- 2. Used for biomedical purposes
The composition of the material hydroxyapatite Ca10(PO4)6(OH)2 (HA for short) bioceramic is close to the inorganic components of human bone, has good biocompatibility, can form a strong chemical bond with bone, and is an ideal hard tissue replacement material. However, the HA implants currently prepared generally have a high elastic modulus and low strength, and the activity is not ideal. Phosphate glass adhesive is used to bond the HA raw material powder together at a temperature lower than the traditional sintering temperature, thereby reducing the elastic modulus and ensuring the activity of the material.
The application of adhesives in medicine is hailed as a new growth point for the adhesive industry. Structural adhesives composed of epoxy resin or unsaturated polyester.
Post time: 2025-05-30 11:13:34