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Dec 3, 2021
According to the chemical structure and composition of the coupling agent, it is divided into four categories: organic chromium complexes, silanes, titanates and aluminates:
Folded chromium complex coupling
Agent Chromium complex coupling agent was developed in the early 1950s. The metal chromium complex formed by unsaturated organic acid and trivalent chromium ion has mature synthesis and application technology and low cost, but the variety is relatively single.
Folding titanate coupling agent
According to their unique molecular structure, titanate coupling agents include four basic types: ①Single alkoxy type coupling agents are suitable for a variety of resin-based composite material systems, especially suitable for no free water, only containing Chemically bonded water or physical water filling system; ②Monoalkoxy pyrophosphate type coupling agent is suitable for various resin-based composite material systems, especially suitable for filler systems with high moisture content; ③Chelating type This type of coupling agent is suitable for a variety of resin-based composite material systems. Because of their very good hydrolytic stability, this type of coupling agent is particularly suitable for water-containing polymer systems; ④The ligand type of this type of coupling agent is used in a variety of Both resin-based or rubber-based composite systems have good coupling effects, which overcome the shortcomings of common titanate coupling agents used in resin-based composite systems.
Folding other coupling agents
The zirconium coupling agent is a low molecular weight inorganic polymer containing zirconium aluminate. It can not only promote the adhesion between different substances, but also improve the performance of the composite material system, especially the rheological properties. This type of coupling agent is not only suitable for a variety of thermosetting resins, but also for a variety of thermoplastic resins. In addition, there are magnesium coupling agents and tin coupling agents.
Among the reinforced plastics, a chemical substance that can improve the bonding force between the resin and the reinforced material.
A substance that promotes or establishes a strong bond at the interface between the resin matrix and the reinforcing material.
Note: The coupling agent can be applied to the reinforcing material or added to the resin, or a combination of both.
Application area
Main functions
Glass fiber, glass fiber reinforced plastic: improve the wet physical and mechanical strength and wet electrical properties of composite materials, and improve the bundling, protection and processing technology of glass fiber.
Adhesives and coatings: improve the wet adhesion, weather resistance, improve pigment dispersion, improve wear resistance and resin crosslinking.
Casting: Improve the strength of resin sand. In order to achieve high height and low gassing.
Rubber: Improve the mechanical strength, wear resistance, wet electrical properties and rheology of products.
Sealant: Improve wet adhesion, improve filler dispersion, and product wear resistance.
Textile: Make textile soft and plump, improve its water resistance, and its adhesion to dyes.
Printing ink: Improve the wettability of adhesion.
Filler surface treatment: Improve the compatibility, wettability and dispersibility of the filler and resin in the resin.
Cross-linked polyethylene: used to increase the strength of cross-linked polyethylene cables and hot water pipes. Durability and service life.
The main purpose of this paragraph
Among the reinforced plastics, a chemical substance that can improve the bonding force between the resin and the reinforced material.
A substance that promotes or establishes a strong bond at the interface between the resin matrix and the reinforcing material.
Note: The coupling agent can be applied to the reinforcing material or added to the resin, or a combination of both.
Application areas, main functions:
Glass fiber, glass fiber reinforced plastic: improve the wet physical and mechanical strength and wet electrical properties of composite materials, and improve the bundling, protection and processing technology of glass fiber.
Adhesives and coatings: improve the wet adhesion, weather resistance, improve pigment dispersion, improve wear resistance and resin crosslinking.
Casting: Improve the strength of resin sand. In order to achieve high height and low gassing.
Rubber: Improve the mechanical strength, wear resistance, wet electrical properties and rheology of products.
Sealant: Improve wet adhesion, improve filler dispersion, and product wear resistance.
Textile: Make textile soft and plump, improve its water resistance, and its adhesion to dyes.
Printing ink: Improve the wettability of adhesion.
Filler surface treatment: Improve the compatibility, wettability and dispersibility of the filler and resin in the resin.
Cross-linked polyethylene: used to increase the strength of cross-linked polyethylene cables and hot water pipes. Durability and service life.
Mechanism of action
Understanding the relationship between the structure and performance of titanate can help you choose various varieties correctly.
Tetravalent elements are the best molecular builders, such as tetravalent titanium carbon --- constitute the basis of life. Similarly, titanium chemistry shows that tetravalent titanium can enable chemists to synthesize various molecular types of titanates as coupling agents. In addition to providing good coupling effects for different fillers and polymer systems, they also show Various other functions.
Titanate does not undergo transesterification reaction in thermoplastic polymers such as polyolefins, but in polyester, epoxy resin or soft polyvinyl chloride plastics with ester plasticizers, transesterification reaction does not occur. have a great impact. Too high activity of the transesterification reaction will cause adverse consequences. For example, titanate like KR-9S, when added to the polymer, the transesterification reaction can occur quickly, the initial viscosity rises sharply, and the filling volume is greatly reduced. However, titanate esters such as KR-12 have low activity in transesterification reaction and no initial viscosity effect, but the transesterification reaction can gradually proceed over time, so that not only the initial dispersibility is good, but the filling amount can be greatly increased.
Functional area long-chain entangled group of thermoplastic polymer, organic skeleton in titanate molecule.
Due to the existence of a large number of long-chain carbon atoms, the compatibility with the polymer system is improved, which causes the change of the surface energy at the interface of the inorganic substance, has the function of flexibility and stress transfer, and produces self-lubricating effect, resulting in a substantial decrease in viscosity and improvement The processing technology increases the elongation and tear strength of the product, and improves the impact performance. If R is an aromatic group, the compatibility of titanate and aromatic polymer can be improved.
From the functions of the above six functional areas, it can be seen that the titanate coupling agent has great flexibility and versatility. It is not only a coupling agent, but also a dispersant, wetting agent, adhesive, and Coupling agents, catalysts, etc., can also have multiple functions such as anti-rust, anti-oxidation, and flame retardant, so it has a wide range of applications and is better than other coupling agents.