The recent anti-corrosion epoxy powder coating to study the modification. According to experts, industry associations epoxy, epoxy powder coating is a solid composition containing 100% "green paint", with its excellent adhesion, flexibility and excellent corrosion resistance, and corrosion by the anti-life corrosion coatings industry workers of all ages; but the acid and organic solvent resistance is poor, with high water absorption, and poor resistance to boiling water vulnerability greatly limits its application, the study of the epoxy resin system was modified to improve its physical mechanical properties and chemical resistance.glue stick The researchers prepared epoxy powder coating, the experimental process, to set in a more uniform mixture of raw materials, materials used first before using coarse grinding to 50 mesh, and then, to weigh ingredients, mix well and melt mixing 70 ~ 80 ℃ After 20min, cooled to room temperature and then crushed to 180 mesh sieve, which are finished backup. Experiment by adding phenolic resin, epoxy resin matrix was modified; phenolic resin was added to make two kinds of active groups resin crosslinking reaction between the produced, modified from the existing epoxy coating adhesion and flexibility, large, anti- basic good advantage, but also has water resistance of phenolic resin, solvent resistance and excellent acid resistance characteristics. In epoxy resin powder coatings based on the basic recipe, add the adjustment epoxy resin, and phenolic resin and the amount of curing agent.
Modification of epoxy resin powder coating formulations circumstances, according to Chinese experts for the epoxy resin industry associations 100, phenolic resin 0 30 filler, plasticizer 3, 4, curing agent, leveling agent 0.5, curing accelerator Agent 0.5; B: 98 epoxy resin, phenolic resin, 2, filler 30,, 4 curing agent, leveling agent 0.5, 0.5 epoxy resin curing accelerator 95, phenolic resin, 5, toughening agents 3, 4, curing agent, curing accelerator 0.5; D: epoxy resin 90, 10, phenolic resin, plasticizer 3, 4, curing agent, leveling agent 0.5 0.5 curing accelerator. Then carried out a detailed tests, performance tests, including powder coating - Appearance: visual method to observe the epoxy powder coating, paint color is observed uniformly, whether there is caking, etc.; glue time: the light of determination; Powder Coatings tests include - Appearance: visual method to score 10 points, scoring the light of the U.S. 3M, the coating epoxy powder coating performance measurement; Shock: The film was used to determine impact resistance; water absorption, the coating made of thickness of 300 ~ 400μm of free films, immersed in distilled water in a certain temperature, a certain time, press-type water absorption were measured.
Another pencil hardness measured according to determination of film hardness, bending strength according to the determination of chemical corrosion resistance according to the determination of salt spray test according to the determination of adhesion determination of the oil ministry standard SY/T0315-2005 determination; differential scanning calorimetry used to analyze the company's comprehensive thermal analyzer test, the sample is about the quality of 5mg, under the specified heating rate, atmosphere, high purity nitrogen; infrared spectrometry: A U.S. company Intelligent FTIR Spectrometer, KBr and KBr pressed chip film sample preparation. Not increase by phenolic resin phenolic resin formula A formula with added C, the membrane made of epoxy free water absorption in distilled water at 100 ℃ for comparison, one can see the same time: adding epoxy resin free of water uptake, always better than no increase of epoxy resin with low water absorption free films, which joined the epoxy resin can reduce the free film after water absorption; also see growth in the water absorption tends to change over time, that water absorption has been saturated. China Epoxy Resin Industry Association of expert analysis, two kinds of resin crosslinking increased the crosslinking density and more uniform distribution of cross-linked bond, thereby increasing resistance of the film medium permeability. Both SEM images from two observations, adding after the phenolic resin system to improve the homogeneity of
From the bonding adhesive formulations major role in the material, such as resin, rubber, plastics, metal oxides, silicates and so can be used as adhesive material.
Resin secreted by trees of lipid named, is a semi-solid, solid, or pseudo-solid, fluid dynamics of transparent or translucent amorphous organic polymer material. There is no fixed melting point, only softening temperature or melting temperature range, heating soft, melt sticky, soluble in organic solvents, natural resins and synthetic resin are divided.
Rubber, also known as elastomers, high temperature, high elasticity, the force generated when large deformation, in addition to restitution force can after a class of polymers, including natural rubber and synthetic rubber.
Plastics, synthetic or natural polymers as the basic ingredient, add or without additives, at a certain temperature and pressure can be made of plastic type, and maintain the same shape of solid materials. Thermoplastic plastic box can be divided into two major categories of thermosetting plastics.
Thermoplastic elastomer, is a kind of performance of vulcanized rubber, thermoplastic molding methods may also use the new elastomer materials processing.
Curing agent, joined the adhesive directly involved in chemical reactions, so that occurrence of curing adhesive material.
Crosslinking agent, and macromolecules through the main chain or side chain groups on the reaction, the molecules form a chemical bridge between the keys, but does not melt into insoluble mesh or size structure of unsaturated bond or functional group substances, some of the curing agent or curing agent is sometimes cross-linking agent.
Modifier added adhesive formulations to improve the performance of its various components are all modifiers, such as plasticizers, plasticizer, coupling agent and other substances.
Plasticizer, adding adhesives to improve flexibility, mixed coating of high boiling point liquids or low melting solids.
By soft drugs, with active groups, and miscible with the adhesive resin, and can participate in reactions, the introduction of a flexible segment, thereby increasing the flexibility of the pre-polymer, such as liquid rubber, such as low molecular weight polyamide.
Toughening agent for reducing brittleness and improve impact strength and flexural strength, and adding organic or polymer material. Not completely miscible, phase separation can participate or not participate in the reaction resin adhesive, such as nitrile rubber.