The national standard GB/T27051992 classifies coatings according to the main film-forming substances. Compared with the 1992 version, the new coating product classification, naming and model standards (GB/T 2705-2003) have greatly improved difference. The notable change is that the 2003 version of the standard cancels the model of paint products. The 2003 version of the new standard puts forward two classification methods, adding the main line of coating product use and supplementing the classification method of the main film-forming substances; supplementing and improving the classification method based on the main film-forming substances, supplementing the main film-forming substances of the product as appropriate Use, and highlight architectural coatings.
Due to the great influence of GB/T2705-1992 over the years, the vast majority of paint companies in my country have consistent specifications on paint models and naming. At present, the vast majority of paint workers who carry out anti-corrosion coatings have deep impressions and habits on the models and names of these coatings. The new standards have not yet been widely applied. It is necessary to summarize the old standards here, so as to Coating knowledge can connect the past and the future.
There are two methods in GB/T 2705-2003 "Classification and Naming of Coating Products".
The first is divided by the use of coatings (classification method 1)' divides coatings into three main categories: architectural coatings, industrial coatings and general coatings and auxiliary materials.
In addition to architectural coatings, the second type takes the main film-forming substances of coating products as the main line, and appropriately supplements the main uses of the products to divide (classification method 2' Table 2-2), and divides coating products into two main categories: architectural coatings Coatings, other coatings and auxiliary materials.
The main varieties of auxiliary materials for coatings include thinners, moisture-proof agents, drier, paint removers, curing agents and other auxiliary materials.
The nomenclature of coatings generally consists of the name of the color or pigment plus the name of the film-forming substance, followed by the basic name (property or professional use). For non-pigmented varnishes, the full name generally consists of the name of the film-forming substance plus the basic name.
Color names usually include red, yellow, blue, white, black, green, purple, brown, gray, etc., sometimes combined with words such as deep, medium, and light (light). If the pigment has a significant effect on the performance of the paint film, the name of the pigment can be used instead of the name of the color, such as iron red, zinc yellow, red lead, etc.
The names of film-forming substances can be appropriately simplified, for example, polyurethane can be simplified as polyurethane, epoxy resin can be simplified as epoxy, and nitrocellulose can be simplified as nitro, etc.
The basic name indicates the basic variety, characteristics and professional use of the paint, such as varnish, enamel paint, primer, hammer paint, can paint, deck paint, automotive refinish paint, etc., and is only used as an informative material in the standard for reference.
Between the name of the film-forming substance and the basic name, if necessary, appropriate words can be inserted to indicate professional use and characteristics, such as white nitro ball table paint, iron red epoxy polyacrylphenol aldehyde dryingInsulating paint. In addition to thinners, individually packaged products that produce chemical reactions or do not produce chemical reactions after mixing can be considered as one of the coating components.
The classification of coating products in GB/T 2705-1992 is mainly divided into 17 categories based on film-forming substances, as shown in Table 2-3. If the main film former is a mixed resin, it is based on the one resin that plays a major role in the paint film.
The name of the paint consists of three parts, namely the name of the color or pigment, the name of the film-forming substance and the basic name, which can be expressed by the following simple formula:
Full name of coating = pigment or color name + main film former + basic name
However, manufacturers seem to prefer to call it this way: main film former + pigment or color + basic name
For example, alkyd red lead antirust paint, chlorinated rubber mica iron antirust paint, epoxy iron red shop primer
When there are multiple film-forming substances in the base material, choose a main film-forming substance to name it. Sometimes two main film-forming substances can also be named to clearly illustrate their characteristics. Such as epoxy coal tar pitch paint, epoxy phenol acetate paint, etc. The basic name adopts the name that has been widely used, such as varnish, enamel, acid-resistant paint, fire-resistant paint, etc. In order to distinguish different products of the same paint, each paint has a model number, and different models represent different basic products.
Codes of basic names related to anti-corrosion coatings for steel structures: 03 Blending paint, 04 Enamel paint, 05 Powder coating, 06 Primer, 40 Antifouling paint, 41 Waterline paint, 42 Deck paint, 52 Anti-corrosion paint, 53 Anti-rust paint wait.
In order to distinguish various paints of the same type, there is a model number before the name to show the distinction. It uses pinyin letters to indicate the paint category to indicate the paint category, the first and second Arabic numerals indicate the model, and the third and fourth digits after the dash Indicates the product serial number.
