Paint formulation: comparison of heavy duty anticorrosive paint formulations at home and abroad

Core tip: at present, the market of heavy-duty anticorrosive coatings is mainly dominated by foreign brands, such as Hempel, Jotun, IP, sigma Kalon, Kansai, Nippon, Ameron, Chugoku, etc the product formulas of these companies have many common features, basically all of which are available With alternative varieties, but each company also has its own special products, such as super weather resistant engineering siloxane, fluorocarbon, high solid content and low Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Home of coatings: At present, the market of heavy-duty anticorrosive coatings is mainly monopolized by foreign brands, such as Hempel, Jotun, IP, sigma Kalon, Kansai, Nippon, Ameron, Chugoku, etc the product formulas of these companies have many similarities and can basically be replaced by each other But each company also has its own special products, such as super weather resistant engineering siloxane, fluorocarbon, high solid content and low surface treatment coating, high solid content and high photopolymer, underwater coating, Wuxi self polishing coating, etc Through the data integration of many years' formulation analysis by microspectrum technology, and by analyzing these formulation principles in this paper, we can enlighten our colleagues to analyze other varieties of heavy-duty anticorrosive coatings, such as acrylic acid, chlorinated rubber, ethylene, alkyd, etc The traditional epoxy heavy-duty anticorrosive coating has two main mechanisms: conversion type and stability type Chromate, phosphate, phosphoric acid, potassium ferrocyanide and stable rust pigment are added to the formula For example, transforming rust into iron compound with stable structure, and then adhering the transformed rust layer to the surface of steel by film-forming liquid The stable rust coating uses a variety of stabilizers to complexate with rust, which makes the rust passivation inactive and turns into the filler in the coating The main disadvantage is that the coating is acid, which has a destructive effect on the matching paint behind it The ratio of conversion solution and film-forming solution should be adjusted at any time In fact, it is difficult to grasp and achieve a better coordination The amount of residual rust on the surface of steel makes the conversion effect different, while the amount of rust leaves residual rust; If there is less rust, there will be residual liquid, which will corrode the base material The coating contains heavy metals, which is harmful to environmental protection The anti-corrosion grade of the film-forming liquid is not high, and the stability, compactness and corrosion resistance of the final coating are not high The formulation analysis of a new heavy-duty anticorrosive coating in China in the past few years, a domestic manufacturer has introduced the so-called labor-saving heavy-duty anticorrosive coating, which has certain technical content and good practical application effect Now, the formulation mechanism is briefly introduced: this kind of paint is actually a modified epoxy paint, first of all, formaldehyde, phenol and tannin are used for dehydration reaction under the catalysis of oxalic acid to form a medium Then the resin reacts with bisphenol A epoxy resin and dimeric acid to synthesize modified epoxy resin as a component resin The basic formula is as follows: raw material name and mass ratio of component A: phenol-100; 37% formaldehyde-150; industrial tannin-100; oxalic acid-1; solvent-150; epoxy resin-400; dimeric acid-55; solvent-300 curing agent: nonylphenol and polyformaldehyde are used to modify polyamide resin with amine value of about 400 The basic formula is as follows: raw material name and mass ratio of component B: Polyamide resin-250; polyketone-90; nonylphenol-180; polyformaldehyde-48; mixed solvent-400 are also obtained by reflux reaction and vacuum It can be seen from the chemical modification I of the above resin that component A has the function of dissolving rust, while component B has the function of moisture In the production of paint, by selectively adding inert pigments and fillers that can eliminate stray current, the paint produced has excellent performance After adding ultra-fine zinc powder, the primer containing zinc can be made It is said that the paint can withstand smoke for up to 10000h, and has been used in Navy, Gezhouba and other important projects with good effect But the paint can not be made into light color paint, the production process is relatively complex, and there are waste gas and sewage discharge, there are certain limitations Formulation analysis of foreign brand heavy duty anticorrosive coatings One of the obvious characteristics of foreign paint manufacturers is the specialization of formula and production process Specifically, the paint manufacturers only produce paint, but not resin There are two advantages One is to greatly simplify the production process of paint manufacturers, reduce the investment of expensive resin synthesis equipment, and enable small-scale factories to produce high output The other is to widely screen Excellent raw materials, such as resin, can also be customized by resin manufacturers if the output is large I have studied some famous brands of similar heavy-duty anticorrosive coatings, which are characterized by low VOC, high solid content, and volume solid content of more than 85% The base material (component a) is basically bisphenol A epoxy resin with low molecular weight Most of them have been modified on curing agent or added with its latest developed rust penetrating agent The following formula is a brand formula: Component a raw material name: bisphenol a epoxy-38; silica-0.6; assistant-0.3; surface untreated titanium dioxide-4; fibrous talcum powder-22; Bian alcohol-2; solvent-5.2 component B raw material name: hydrocarbon plasticizer-13; fatty amine-4; polyether amine-19; fibrous talcum powder-22; nonylphenol-12; Bian alcohol-4.5; solvent-15; rust penetration assistant-2.5 The components of a and B are mixed by volume ratio of 1:1 It should be noted that rutile titanium dioxide without surface treatment is used in the formula of component A according to the test, adding conventional rutile titanium dioxide with surface treatment to the epoxy resin will increase the epoxy equivalent and have a negative impact on the film-forming in the future if the storage time is long Fiber like talcum powder will improve the water and chemical resistance of the film, improve the impact resistance and softness of the film Toughness and so on Polyether amine used in component B has the function of moisture tolerance Nonylphenol and Bian alcohol in the formula act as accelerants and participate in the reaction, which are quite different from the formula design of domestic epoxy paint The volume solid content of the paint is 85%, the VOC content meets the environmental protection requirements, and the dry film of single layer construction can reach 125um Because of its low solvent content, the possibility of residual solvent between pinhole and coating is greatly reduced This is a common problem in the use of ordinary epoxy coating, which eventually leads to coating failure It can be bottomed on a variety of coatings, and is compatible with the treated wet surface and the treated rust spots with good adhesion However, the surface treatment only needs to reach ST2, and accelerant can be added during construction at low temperature 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,