增韧剂，是指能增加胶黏剂膜层柔韧性的物质。某些热固性树脂胶黏剂，如环氧树脂、酚醛树脂和不饱和聚酯树脂胶黏剂固化后伸长率低，脆性较大，当粘接部位承受外力时很容易产生裂纹，并迅速扩展，导致胶层开裂，不耐疲劳，不能作为结构粘接之用。因此，必须设法降低脆性，增大韧性，提高承载强度。凡能减低脆性，增加韧性，而又不影响胶黏剂其他主要性能的物质即为增韧剂。可分为橡胶类增韧剂和热塑性弹性体类增韧剂。不同类型的增韧剂，有着不同的增韧机理。液体聚硫橡胶可与环氧树脂反应，引入一部分柔性链段，降低环氧树脂模量，提高了韧性，却牺牲了耐热性。液体丁腈橡胶作为环氧树脂的增韧剂，室温固化时几乎无增韧效果，粘接强度反而下降；只有中高温固化体系，增韧与粘接效果较明显。端羧基液体丁腈橡胶增韧环氧树脂，固化前相容，固化后分相，形成“海岛结构”，既能吸收冲击能量，又基本不降低耐热性。T-99多功能环氧固化剂固化环氧树脂使交联结构中引进了柔性链段，不产生分相结构，在提高韧性的同时基本不降低耐热性。热塑性树脂连续贯穿于环氧树脂网络中，形成半互穿网络型聚合物，致使环氧树脂固化物韧性提高。
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. It can be divided into rubber type toughening agents and thermoplastic elastomer type toughening agents. Different types of toughening agents have different toughening mechanisms. Liquid polysulfide rubber can react with epoxy resin, introducing a portion of flexible chain segments to reduce the modulus of epoxy resin and improve toughness, but sacrificing heat resistance. Liquid nitrile rubber, as a toughening agent for epoxy resin, has almost no toughening effect when cured at room temperature, but the bonding strength decreases; Only the medium to high temperature curing system has significant toughening and bonding effects. Carboxyl terminated liquid nitrile rubber toughened epoxy resin, compatible before curing, separated into phases after curing, forming an "island structure" that can absorb impact energy without reducing heat resistance. The T-99 multifunctional epoxy curing agent solidifies epoxy resin by introducing flexible chain segments into the cross-linked structure, without generating a phase separation structure, which improves toughness while basically not reducing heat resistance. Thermoplastic resin continuously penetrates the epoxy resin network, forming a semi interpenetrating network type polymer, resulting in an increase in the toughness of the cured epoxy resin.
纳米粒子尺寸为1-100nm，具有极大的比表面积，表面原子又有极高的不饱和性，因此表面活性非常大。环氧基团在界面上与纳米粒子形成远大于范德华力的作用，能很好地引发微裂纹，吸收能量。纳米SiO2和纳米黏土既能引发银纹，又型线  流水槽模具 景观石 检查井钢模具 保定通风管道 隔离墩模具 保定保洁公司能终止裂纹。同时，纳米粒子具有很强的刚性，裂纹在扩展时遇到纳米粒子发生箨向或偏转，吸收能量而达到增韧目的。另外，纳米粒子与树脂具有良好的相容性，使基体对冲击能量的分散能力和吸收能力提高，导致韧性增大
Nanoparticles are 1-100nm in size, have a large specific surface area, and the surface atoms are highly unsaturated, so the surface activity is very large. The formation of epoxy groups on the interface with nanoparticles is far greater than the van der Waals force, which can well initiate microcracks and absorb energy. Nano SiO2 and nano clay can both initiate silver lines and terminate cracks. At the same time, the nano particles have strong rigidity. When the crack grows, the nano particles will deflect or deflect towards the sheath, absorbing energy and achieving the purpose of toughening. In addition, the nano particles have good compatibility with the resin, which improves the dispersion and absorption ability of the matrix to impact energy, leading to increased toughness