Coating formulation: preparation of new multifunctional epoxy anticorrosive coating

Abstract: a new multi-functional epoxy anticorrosive coating has been developed, which has good storage stability and workability It has the characteristics of bottom in one, rust proof, damp coating, low temperature curing and long-term anticorrosion Key words: multi-functional epoxy anticorrosive paint; bottom surface integrated paint; rust paint Chinese Library Classification No.: tq630.7 document identification code: a Article No.: 1009-1696 (2014) 02-0024-03 0 Introduction As a simple and effective method of material protection and decoration, coating has been widely used Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Abstract: a new multi-functional epoxy anticorrosive coating is developed, which has excellent storage stability and construction performance It has the characteristics of bottom integration, rust prevention, moisture coating, low-temperature curing and long-term anticorrosion Key words: multi-functional epoxy anticorrosive coating; bottom in one paint; Chinese painting with rust classification number: tq630.7 document identification code: a article number: 1009-1696 (2014) 02-0024-03 0 · introduction coating, as a simple and effective material protection and decoration method, has been widely used With the development of modern society, higher requirements are put forward for the anticorrosion of coatings, especially for the steel structure workshop, large machinery and chemical equipment In order to obtain good anti-corrosion effect, it is necessary to carry out strict surface treatment on the base material before coating, and generally it is necessary to use primer, intermediate paint, finish paint matching, or primer, finish paint matching coating system, which requires a large amount of coating, complicated process and long interval time In addition, most of the traditional coatings are added with toxic pigments, fillers, organic solvents, etc., which not only damage the environment, but also pose a threat to personal safety In order to meet the needs of social development, coatings are developing towards environmental protection, functional and comprehensive According to the new requirements, new standards and market demands of current coating development, we have developed an epoxy anticorrosive coating with multi-function (including rust and rust prevention, coating with moisture, low-temperature curing, bottom surface integration and long-term anticorrosion) based on practical operation experience and a large number of documents 1 Experimental part 1.1 raw materials E-44 epoxy resin, Sanmu, Jiangsu Province; E-20 epoxy resin, Wujiang Heli; duomeentdo, Akzo Nobel; organic bentonite, Fenghong, Zhejiang Province; polyamide wax, Shanghai Xinli titanium; titanium dioxide, winit Group Hong Kong Co., Ltd.; carbon black, Shanghai Aihui; sericite, Wanqiao, Chuzhou; zinc phosphate, Shanghai Jinghua; aluminum tripolyphosphate, Xinchang, Guangxi Province; n X-2015 curing agent, cardley; curing accelerator, Shanghai dulle 1.2 epoxy resin is one of the most widely used film-forming materials in heavy-duty anticorrosive coatings Epoxy resin contains hydroxyl group, ether group and epoxy group, which has excellent adhesion to metal, wood, concrete and other base materials; the volume shrinkage of epoxy resin is low, and the coating film is applied in large area The cured epoxy resin has good physical and chemical properties, high hardness, good flexibility, excellent chemical resistance, stable for most solvents, excellent acid, alkali, salt and other properties E-44 is a low molecular weight liquid bisphenol A epoxy resin, which has stable chemical properties, strong adhesion, small shrinkage, high crosslinking density, good water resistance and solvent resistance It is suitable for preparing high solid epoxy coating, but the film is brittle E-20 is a solid epoxy resin with strong adhesion, good bending resistance, impact resistance, chemical corrosion resistance and solvent resistance, but low crosslinking density The combination of E-44 epoxy resin and E-20 epoxy resin can obtain excellent comprehensive properties It was found that when the solid content ratio of E-44 epoxy resin to E-20 epoxy resin was about 1 / 2, i.e m (E-44) / M (E-20) (65%) = 1 / 3, the performance of the film was excellent 1.3 selection of antirust pigments zinc phosphate and aluminum tripolyphosphate are efficient, non-toxic and environmentally friendly antirust pigments, which play an important role in anticorrosive coatings Zinc phosphate slowly dissociates into phosphate ion in the coating, which reacts with Fe3 + (rust) on the metal surface, forming a solid complex precipitation layer to inhibit the anode reaction Aluminum tripolyphosphate is a typical representative product of polyphosphate antirust pigments Its environmental protection and excellent antirust effect make it an ideal substitute for red lead, zinc chrome yellow and other harmful antirust pigments Aluminum tripolyphosphate can dissociate the tripolyphosphate ion p3o105 - with strong chelating ability in the coating, form insoluble complex with a variety of metal ions, and form a complex protective film When zinc phosphate and aluminum tripolyphosphate are used together, the long-term and high-efficiency anticorrosion of the system can be realized It is found that when m (zinc phosphate) / M (aluminum tripolyphosphate) is 1 / 2 ~ 1 / 3, the anticorrosion effect is excellent In addition, adding proper amount of Sericite in the formulation can effectively improve the impermeability and corrosion resistance of the coating 1.4 selection of curing agent cashew oil modified phenolic amine epoxy curing agent has the properties of general phenolic amine and low molecular polyamide, with excellent comprehensive performance The polyaniline group introduced by the reaction and the adjacent weak acid phenolic hydroxyl group are the catalyst of the curing reaction of epoxy resin, so that the epoxy resin can also be cured rapidly at low temperature At the same time, the polar hydroxyl group increases the polarity of the curing agent, enhances the wettability and adhesion to the substrate In order to achieve the goal of low temperature curing, a proper amount of low temperature curing accelerator can also be added 1.5 the selection of solvent is the key step in the preparation of coatings The key to the selection of solvent is the dissolving power of the solvent, the evaporation rate and reactivity of the solvent, etc Esters and ketones should not be used as solvents in epoxy resin The toxic side effects of glycol ether solvents are large In actual production, the mixed solvents composed of alcohol and aromatics are generally used in epoxy resin The results show that the mixed solvent of M (S-100 aromatics solvent): m (butanol): m (propylene glycol methyl ether) = 70:20:10 can make the epoxy system have good storage stability and workability 1.6 after repeated parallel experiment screening and orthogonal experiment comparison, the basic formula is determined as shown in Table 1 Table 1 basic formula of paint 1.7 component a of paint making process: put the epoxy resin, auxiliary agent and solvent in the formula into the mixing tank to mix evenly; then put the pigment and filler into it to mix evenly; then sand it to the specified fineness; finally adjust the viscosity according to the technical index Component B: input raw materials according to formula amount, and mix evenly When the coating is used, components a and B are mixed evenly according to the ratio of 100:20 1.8 see Table 2 for coating performance index and test results Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,