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The use and types of toughening agents
2023/4/20
In daily life, toughening agents can be used in many aspects, such as making household container products, trash cans, plastic benches, etc. They can increase product toughness, improve impact resistance, tensile strength, and do not affect other properties. They are a very practical type of additive. Due to the brittleness of many polymers at room temperature, which greatly reduces the product's value in use, toughening agents can effectively solve this problem and enhance the product's value in use.
Introduction to toughening agents:
The so-called toughening agent refers to a substance that can increase the flexibility of the adhesive film. Some thermosetting resin adhesives, such as epoxy resin, phenolic resin, and unsaturated polyester resin adhesives, have low elongation and high brittleness after curing. When the bonding area is subjected to external forces, it is easy to produce cracks and rapidly expand, leading to the cracking of the adhesive layer. They are not fatigue resistant and cannot be used for structural bonding. Therefore, efforts must be made to reduce brittleness, increase toughness, and improve bearing strength. Any substance that can reduce brittleness and increase toughness without affecting the other main properties of the adhesive is called a toughening agent.
The main uses of toughening agents:
Toughening agents are a type of additive that can reduce the brittleness of composite materials and improve their impact resistance. It can be divided into two types: active toughening agents and non active toughening agents. Active toughening agents refer to the active groups on their molecular chains that can react with the matrix resin. They can form a network structure, add a part of the flexible chain, and thus improve the impact resistance of composite materials. Non active toughening agents are a type of toughening agent that is well soluble with the matrix resin but does not participate in chemical reactions.
According to their properties, they can be divided into three categories:
(1) Rubber type toughening agents: The main varieties of this type of toughening agent include liquid polysulfide rubber, liquid polybutadiene rubber, nitrile rubber, ethylene propylene rubber, and styrene butadiene rubber.
(2) Thermoplastic elastomer: Thermoplastic elastomer is a type of synthetic material that exhibits rubber elasticity at room temperature and can be plasticized at high temperatures. Therefore, this type of polymer combines the characteristics of rubber and thermoplastic, and can serve as both a toughening agent for composite materials and a matrix material for composite materials. This type of material mainly includes products such as polyurethane, styrene, polyolefins, polyester, syndiotactic 1,2-polybutadiene, and polyamide. Currently, styrene and polyolefins are commonly used as toughening agents for composite materials.
(3) Other toughening agents: Other toughening agents suitable for composite materials include low molecular polyamides and low molecular non active toughening agents, such as phthalates. Non active toughening agents can also be referred to as plasticizers, which do not participate in the curing reaction of the resin.
In summary, toughening agents have great applications in many aspects, whether in industrial or household products, they can play a significant role and are currently widely used in various polymers. There are many different types of toughening agents on the market, and the prices are also different. Therefore, choosing a good toughening agent can greatly improve the product's value. At the same time, different types of toughening agents need to be selected according to different uses in order to achieve their effects.
Introduction to toughening agents:
The so-called toughening agent refers to a substance that can increase the flexibility of the adhesive film. Some thermosetting resin adhesives, such as epoxy resin, phenolic resin, and unsaturated polyester resin adhesives, have low elongation and high brittleness after curing. When the bonding area is subjected to external forces, it is easy to produce cracks and rapidly expand, leading to the cracking of the adhesive layer. They are not fatigue resistant and cannot be used for structural bonding. Therefore, efforts must be made to reduce brittleness, increase toughness, and improve bearing strength. Any substance that can reduce brittleness and increase toughness without affecting the other main properties of the adhesive is called a toughening agent.
The main uses of toughening agents:
Toughening agents are a type of additive that can reduce the brittleness of composite materials and improve their impact resistance. It can be divided into two types: active toughening agents and non active toughening agents. Active toughening agents refer to the active groups on their molecular chains that can react with the matrix resin. They can form a network structure, add a part of the flexible chain, and thus improve the impact resistance of composite materials. Non active toughening agents are a type of toughening agent that is well soluble with the matrix resin but does not participate in chemical reactions.
According to their properties, they can be divided into three categories:
(1) Rubber type toughening agents: The main varieties of this type of toughening agent include liquid polysulfide rubber, liquid polybutadiene rubber, nitrile rubber, ethylene propylene rubber, and styrene butadiene rubber.
(2) Thermoplastic elastomer: Thermoplastic elastomer is a type of synthetic material that exhibits rubber elasticity at room temperature and can be plasticized at high temperatures. Therefore, this type of polymer combines the characteristics of rubber and thermoplastic, and can serve as both a toughening agent for composite materials and a matrix material for composite materials. This type of material mainly includes products such as polyurethane, styrene, polyolefins, polyester, syndiotactic 1,2-polybutadiene, and polyamide. Currently, styrene and polyolefins are commonly used as toughening agents for composite materials.
(3) Other toughening agents: Other toughening agents suitable for composite materials include low molecular polyamides and low molecular non active toughening agents, such as phthalates. Non active toughening agents can also be referred to as plasticizers, which do not participate in the curing reaction of the resin.
In summary, toughening agents have great applications in many aspects, whether in industrial or household products, they can play a significant role and are currently widely used in various polymers. There are many different types of toughening agents on the market, and the prices are also different. Therefore, choosing a good toughening agent can greatly improve the product's value. At the same time, different types of toughening agents need to be selected according to different uses in order to achieve their effects.
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