Organosilicon crosslinking agent is a widely used chemical in polymer materials, which forms chemical crosslinking structures between polymer molecular chains, thereby enhancing the physical and chemical properties of the material. The following is a detailed introduction about organosilicon crosslinking agents:
definition
Organic silicon crosslinking agent is a compound or oligomer that can generate a three-dimensional structure in polymers. Many polymers can only become processable materials after adding crosslinking agents, and therefore have better physical and mechanical properties, heat resistance, solvent resistance, etc.
type
There are various types of organosilicon crosslinking agents, including but not limited to the following:
R-Si-R/3R=Me, Et, Ar and other hydrocarbon groups :This type of organosilicon crosslinking agent has different alkyl substituents, which affect its interaction and crosslinking effect with polymers.
Si (OR/) 4 R=CH3, C2H5, etc: This is another common type of organosilicon crosslinking agent, in which the OR group is easily hydrolyzed and reacts with the polymer.
silane coupling agent: For example, Q (CH) n-Si (OR/) 3 (Q is an organic functional group; n=1,3), silane coupling agents are commonly used to improve the interfacial properties between inorganic and organic compounds.
Hydrogen containing silicone oil and other oligomers: This is also a type of organosilicon crosslinking agent with specific chemical structure and properties.
Chemical properties and reactions
The chemical properties of organosilicon crosslinking agents mainly involve hydrolysis reactions, condensation reactions of different functional groups, and crosslinking reactions. These reactions enable the organic silicon crosslinking agent to interact with polymer molecular chains, forming a stable crosslinked structure.
Main applications
Organic silicone crosslinking agents have a wide range of applications in various fields, including:
Improve the physical properties of materials： By adding organosilicon crosslinking agents to polymers, the tensile strength and heat resistance of materials can be significantly improved. The cross-linking structure enables the polymer molecular chains to form a tighter structure, thereby making the material more solid and stable.
Waterborne coatings, adhesives, and ink wash： Organic silicone crosslinking agents such as Silicone-9301 are widely used in water-based coatings, adhesives, and ink wash due to their environmentally friendly and non-toxic properties, easy to use single component distribution, and significantly improved adhesion.
Other polymer materials： Organic silicon crosslinking agents are also used to improve the properties of other polymer materials, such as silane coupling agents used for crosslinking and curing of room temperature vulcanized silicone rubber.
Typical physical properties and formula usage
Taking Silicone-9301 as an example, it is a silane with a cyclic oxygen reactive group. It appears as a transparent liquid, with a specific gravity of 1.06 at 25 ℃, a flash point of 110 ℃, and a boiling point (at 760mmHg) of 290 ℃. In formula use, the recommended dosage is between 15-30 for resin acid value when undergoing cross-linking reaction with carboxyl group; The typical range of addition is 0.5-3% of the resin solid content.
summary
Organic silicon crosslinking agents form stable crosslinking structures in polymer materials through their unique chemical structure and properties, significantly enhancing the physical and chemical properties of the materials. It plays an important role in improving the tensile strength and heat resistance of materials, enhancing the adhesion and water resistance of coatings, and has a wide range of applications in water-based coatings, adhesives, and ink wash.
