Many people are only aware of the many uses of epoxy resins, but do not understand some of the characteristics of epoxy resins, especially the corrosion resistance of epoxy resin accelerators, etc., do not understand, the following is analyzed by Kebao to everyone: epoxy The reason why the resin accelerator can resist corrosion;
As an anti-corrosion material, epoxy resin not only has the characteristics of compactness, water resistance, good leakage resistance, high strength, etc., but also has strong adhesion, normal temperature operation, cumbersome construction and other good manufacturability, and the price is moderate. The anti-corrosion projects using this kind of data generally include: FRP sub-layer and isolation layer lined with resin rubber material, block surface layer paved with resin cement and mortar, block surface layer for resin cement plaster jointing and grouting, resin Single and composite whole surface sub-layer and isolation layer made of thin glue or mortar, Plexiglas flake glue surface layer, etc. Different types of materials are used, and the final product function and applicable scope of anti-corrosion engineering will be very different.
Experts said that in addition to the separate use of epoxy resins commonly used in anti-corrosion engineering, they can also be used in combination with unsaturated polyester resins, vinyl ester resins, phenolic resins and furan resins to form a composite structure to give full play to their respective Advantages, reduce costs, improve production quality, easy construction. It can also be modified with other resins to form modified resins. The methods of modification include physical and chemical methods. Epoxy coal tar is a typical physical modification product of epoxy resin, and its performance is between epoxy resin and coal tar. Physically modified resins generally account for 30 to 50% of the total amount of resins; after the resin has stopped chemical modification, the performance of its products has undergone basic changes. Vinyl ester resins are the most typical epoxy chemically modified resins. Sometimes using two or more types of resin materials with better comprehensive performance, according to their characteristics, different structures in different parts of the project, and stopping the construction in sequence can produce a significant effect that is difficult to reach with a single data.
The epoxy resin anti-corrosion data mainly consists of the following data. One is epoxy resin, which is a general term for polymers containing epoxy groups. It is mainly suitable for mediums with less corrosiveness. It has excellent alkali resistance and can resist common acids (except hydrofluoric acid). The demand for epoxy resin in the market has been greatly reduced, mainly due to the rapid development of unsaturated polyester resins and many types of corrosion-resistant resins. Since the unsaturated polyester resin started late in the domestic market, epoxy resins It is still one of the main types of resin in the field of anti-corrosion.
The main characteristics of epoxy resin are high bonding strength, low shrinkage, high brittleness, and high price. The operating temperature of resin cured at room temperature does not exceed 80 ℃; the second is the curing agent of epoxy resin, including amines and anhydrides , Resin compounds and other major categories, of which amine compounds are the most commonly used, it can be divided into fatty amines, aromatic amines and modified amines and other categories, due to ethylenediamine, m-phenylenediamine, xylylenediamine, poly Compounds such as amide and diethylenetriamine are more toxic and breathable, so they are gradually replaced by new non-toxic and low-toxic curing agents (such as: T31.590, C20, etc.). These curing agents are also effective for wet bases and even underwater. It can be cured, so it has increasingly attracted people's attention and praise; the third is a thinner. Epoxy resin is usually diluted with non-reactive diluents such as ethanol, acetone, benzene, toluene, xylene, etc. 2 kinds of non-reactive diluents can be mixed Use, sometimes in order to reduce the shrinkage rate of solidified waste products, reduce pores and cracks, also use reactive diluents, such as propylene oxide butyl ether, propylene oxide phenyl ether, polyglycidyl ether, etc.; fourth is plasticizer, Toughener, pure epoxy resin is relatively brittle after curing, impact toughness, bending strength and heat resistance are poor, commonly used plasticizers and tougheners to increase the plasticity of the resin, improve toughness, improve bending strength and impact Toughness; Fifth, fillers, powders, fine aggregates, coarse aggregates, and glass flakes are collectively called fillers. Participating in appropriate fillers can reduce the cost of the product and improve its performance. The amount of fillers in the glue is common It is 20-40% by weight of the resin dosage. It can be more involved in the preparation of putty. Generally it can be 2 to 4 times of the resin dosage. Commonly used powders are quartz powder, porcelain powder, and graphite powder. Diabase powder, talc powder, mica powder, etc.