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 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: a FRP integral facing and a barrier layer reinforced by a resin compound, a resin cement and a mortar paved block surface layer, a resin cement joint joint and a potting block surface layer, a resin Single and composite integral facing and insulation 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 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 chemical 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.
The epoxy resin anticorrosive material is mainly composed of the following materials. One is epoxy resin, which is a general term for polymers containing epoxy groups. It is mainly used for media with less corrosiveness. It has outstanding alkali resistance and can withstand general acid (except hydrofluoric acid) corrosion. The market 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, the unsaturated polyester resin started late, so the epoxy resin is still It is one of the main resin varieties in the field of corrosion protection.
The main characteristics of epoxy resin are high bond strength, low shrinkage, high brittleness and high price. The temperature of the resin cured at room temperature does not exceed 80 °C. The second is the curing agent of epoxy resin, which has amines and acid anhydrides. , resin compounds and other major varieties, of which amine compounds are most commonly used, it can be divided into fatty amines, aromatic amines and modified amines, etc., due to ethylene diamine, m-phenylenediamine, xylylenediamine, poly Compounds such as amide and diethylenetriamine have higher toxicity and odor, 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 suitable for wet base and even underwater. Can be cured, so it has attracted people's attention and praise; Third, thinner, epoxy resin is usually diluted with non-reactive diluents such as: ethanol, acetone, benzene, toluene, xylene, etc., two kinds of inactive diluent can be mixed Use, sometimes in order to reduce the shrinkage 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.; Fourth, plasticizer, increase Toughener, simple After curing, the epoxy resin is brittle, impact toughness, flexural strength and heat resistance. Plasticizers and toughening agents are commonly used to increase the plasticity, improve the toughness, and improve the flexural strength and impact toughness. Filling materials, powders, fine aggregates, coarse aggregates, and glass scales are collectively referred to as fillers. Adding appropriate fillers can reduce the cost of the products and improve their performance. The amount of fillers in the glue is generally 20% of the amount of resin. ~40% (weight), when adding putty, the amount can be added more, generally 2 to 4 times the amount of resin, the commonly used powder is quartz powder, porcelain powder, in addition to graphite powder, diabase powder, Talc powder, mica powder, etc.
Mini Cotton Picker,Cotton Plucking Machine,Portable Cotton Picker
Other Fertilizer And Chemicals,Pharmaceutical Machinery Co., Ltd. , http://www.nsfertilizers.com