Epoxy Resin

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Epoxy Resin
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Epoxy resin is a generic term for a class of polymers containing two or more epoxy groups in a molecule. It is a polycondensation product of epichlorohydrin with bisphenol A or a polyol. Due to the chemical activity of the epoxy group, a variety of active hydrogen-containing compounds can be used to ring-open, cure and crosslink to form a network structure, and thus it is a thermosetting resin. Bisphenol A epoxy resin not only has the largest output, but also the most complete variety, and the new modified varieties are still increasing, and the quality is constantly improving.

Fnuction and Features:

As an anti-corrosion material, epoxy resin not only has the characteristics of compactness, water resistance, good leakage resistance and high strength, but also has good workability such as strong adhesion, normal temperature operation and simple construction, and the price is moderate. Anti-corrosion engineering using such materials generally includes: FRP integral facing and barrier layer reinforced by resin compound, block layer of resin mortar and mortar paving, block surface of resin cement joint and joint, resin Single and composite integral facing and isolating layers made of thin clay or mortar, plexiglass scale clay surface and so on. Different types of materials are selected, and the final product function and scope of application of the anti-corrosion engineering will be very different. Experts said that the epoxy resin commonly used in anti-corrosion engineering can be used in combination with unsaturated polyester resin, vinyl ester resin, phenolic resin and furan resin to form a composite structure to fully utilize their respective Strengths, cost reduction, product quality improvement and construction. It can also be modified with other resins to form modified resins. The methods of modification include physical methods and chemical methods. Epoxy coal tar is a typical physical modification product of epoxy resin, which makes its performance between epoxy resin and coal tar. The secondary resin in the physical modified resin generally accounts for 30-50% of the total amount; the performance of the product after the chemical modification of the resin has undergone a fundamental change, and the vinyl ester resin is the most typical epoxy chemically modified resin. In some cases, two or more kinds of resin materials with better comprehensive performances may be produced in sequence according to their respective characteristics in different parts of different parts of the project, and a significant effect that is difficult to achieve with a single material may be produced.

Epoxy resin material:

The first is epoxy resin, which refers to the general name of the epoxy-containing polymer. It is mainly used for media with less corrosiveness. It has outstanding alkali resistance and can withstand general acid (except hydrofluoric acid) corrosion. The demand for epoxy resin has been greatly reduced, mainly because the unsaturated polyester resin has been rapidly developed and has many varieties. In the domestic market, since the unsaturated polyester resin started late, the epoxy resin is still One of the main resin varieties in the field of corrosion protection. The main characteristics of epoxy resin are high bonding strength, low shrinkage, high brittleness and high price. The temperature of resin cured at room temperature does not exceed 80 °C;

The second is the curing agent of epoxy resin, which has several major varieties such as amines, acid anhydrides and resin compounds. Among them, amine compounds are most commonly used, and they can be divided into fatty amines, aromatic amines and modified amines. Ethylenediamine, m-phenylenediamine, xylylenediamine, polyamide, diethylenetriamine and other compounds have high toxicity and odor, so they are gradually being non-toxic and low-toxic new curing agents (eg T31.590, C20). Etc.), such curing agents can also be cured on wet base or even underwater, so it has attracted more and more people's attention and praise;

The third is thinner, epoxy resin is usually diluted with non-reactive diluents such as: ethanol, acetone, benzene, toluene, xylene, etc., two kinds of non-reactive diluents can be mixed, sometimes in order to reduce the shrinkage rate of the cured product, reduce Porosity and cracking also use reactive diluents, such as propylene oxide butyl ether, propylene oxide phenyl ether, polyglycidyl ether, etc.; four are plasticizers, toughening agents, simple epoxy resin is more brittle after curing , impact toughness, flexural strength and heat resistance are poor, commonly used plasticizers, tougheners to increase the plasticity of the resin, improve toughness, improve the bending strength and impact toughness; five is filler, powder, fine Aggregate, coarse aggregate and glass scale are collectively referred to as filler. Adding appropriate filler can reduce the cost and improve the performance of the product. The amount of filler in the glue is generally 20-40% by weight of the resin. When adding putty, the amount of addition can be more, generally 2 to 4 times of the amount of resin. The commonly used powder is quartz powder, porcelain powder, in addition to graphite powder, diabase powder, talcum powder, mica powder and the like.

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