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Reasons For The Strong Corrosion Resistance Of Epoxy Resin

Aug 03, 2020

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 manufacturability such as strong adhesion, normal temperature operation, and simple construction, and the price is moderate. Anti-corrosion projects using this kind of materials generally include: resin sizing material auxiliary lining glass fiber reinforced plastic integral surface layer and isolation layer, resin mortar and mortar paving block material surface layer, resin mortar jointing and grouting block material surface layer, resin Single and composite integral surface layer and isolation layer made of thin cement or mortar, resin glass flake cement surface layer, etc. Depending on the variety of materials selected, the final product function and scope of application of the anti-corrosion project will be very different.

Experts said that in addition to being used alone, epoxy resins commonly used in anti-corrosion projects 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 Strengths, reduce costs, improve product quality, and facilitate 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. The secondary resin in the physical modified resin generally accounts for 30-50% of the total; after the chemical modification of the resin, the properties of the product have undergone a fundamental change. The vinyl ester resin is essentially the most typical epoxy chemically modified resin. Sometimes two or more resin materials with better comprehensive performance are used. According to their characteristics, the different structures of different parts of the project are unified, and the sequential construction can produce significant effects that are difficult to achieve with a single material.

The epoxy resin anticorrosive material is mainly composed of the following materials. One is epoxy resin, which refers to a general term for polymers containing epoxy groups. It is mainly suitable for media that is not very corrosive. It has outstanding alkali resistance and can withstand general acid (except hydrofluoric acid) corrosion. At present, it is anti-corrosion abroad. The market’s demand for epoxy resins has been greatly reduced, mainly due to the rapid development of unsaturated polyester resins in corrosion-resistant resins, and there are many varieties. In the domestic market, since unsaturated polyester resins started late, epoxy resins are still It is one of the main resin varieties in the field of anti-corrosion.

The main characteristics of epoxy resin are high bonding strength, low shrinkage, high product brittleness, and high price. The use temperature of resin cured at room temperature does not exceed 80℃; the second is the curing agent of epoxy resin, including amines and acid anhydrides. Among them, amine compounds are the most commonly used. They can be divided into aliphatic amines, aromatic amines and modified amines. Due to ethylenediamine, m-phenylenediamine, xylylenediamine, poly Compounds such as amides and diethylenetriamine are more toxic and odorous, so they are gradually being replaced by non-toxic and low-toxic new curing agents (such as: T31.590, C20, etc.). Such curing agents can also affect wet bases and even underwater. It can be cured, so it has attracted more and more attention and praise. The third is thinner. The epoxy resin is usually diluted with inactive diluents such as ethanol, acetone, benzene, toluene, xylene, etc., and two inactive diluents can be mixed Used, sometimes in order to reduce the shrinkage of cured products, reduce pores and cracks, reactive diluents are also used, such as propylene oxide butyl ether, propylene oxide phenyl ether, polyglycidyl ether, etc.; the fourth is plasticizer, increase Toughening agent, simple epoxy resin is more brittle after curing, and has poor impact toughness, bending strength and heat resistance. Plasticizers and tougheners are commonly used to increase plasticity, improve toughness, and increase bending strength and impact of resin Toughness; Fifth, filler, powder, fine aggregate, coarse aggregate, and glass flakes are collectively referred to as filler. Adding appropriate filler can reduce the cost of the product and improve its performance. The amount of filler in the glue is generally It is 20-40% (weight) of the amount of resin. When preparing putty, the amount added can be more, generally 2 to 4 times of the amount of resin. Commonly used powders are quartz powder, porcelain powder, and graphite powder, Diabase powder, talc powder, mica powder, etc.