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GB/T 9271-2008: Paints and varnishes standard panels for testing
Status: Valid GB/T 9271: Evolution and historical versions
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| GB/T 9271-2008 | English | 349 |
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Paints and varnishes standard panels for testing
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GB/T 9271-2008
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| GB/T 9271-1988 | English | 319 |
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Paints and varnishes--Standard panels for testing
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PDF similar to GB/T 9271-2008
Basic data | Standard ID | GB/T 9271-2008 (GB/T9271-2008) | | Description (Translated English) | Paints and varnishes standard panels for testing | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G50 | | Classification of International Standard | 87-010 | | Word Count Estimation | 15,188 | | Date of Issue | 2008-06-04 | | Date of Implementation | 2008-12-01 | | Older Standard (superseded by this standard) | GB/T 9271-1988 | | Quoted Standard | GB/T 700-2006; GB/T 2520-2000; GB/T 3880.1-2006; GB/T 6682; GB 12626.2-1990; JC/T 412.1-2006; ISO 10546-1993 | | Adopted Standard | ISO 1514-2004, MOD | | Regulation (derived from) | Announcement of Newly Approved National Standards No. 9, 2008 (No. 122 overall) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies several different types of standard test panels, and provides treatment before painting methods, these standard test panels for Paints, varnishes and related products Common test methods. | GB/T 9271-2008: Paints and varnishes standard panels for testing---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Paints and varnishes standard panels for testing
ICS 87-010
G50
National Standards of People's Republic of China
Replace GB/T 9271-1988
Paint and varnish standard test panels
(ISO 1514.2004, MOD)
Released on.2008-06-04
2008-12-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Foreword
This standard is modified to adopt ISO 1514.2004 "Standard Test Plate for Paints and Varnishes" (English version).
This standard has been redrafted in accordance with ISO 1514.2004 Standard Test Panel for Paints and Varnishes.
This standard has been modified in the context of the adoption of international standards, which are identified by vertical single lines on the pages of the terms they relate to.
Blank space. A list of technical differences and their causes is given in Appendix C for reference.
The main technical differences between this standard and ISO 1514.2004 are.
--- Removed the preface to international standards;
--- Most of the standards in the cited documents use the current national standards and industry standards, some of which are developed by China.
standard;
--- In the provisions of steel plates, tinplate, aluminum, hardboard and fiber-reinforced cement board materials, they are required to comply with China.
Requirements of current standards;
--- The sandpaper used in the method of grinding the sample processing method is changed to sandpaper that is required to conform to the industry in China.
This standard replaces GB/T 9271-1988 "Standard Test Plate for Paints and Varnishes".
Compared with GB/T 9271-1988, the main technical differences between this standard are.
--- Added introduction;
--- Changed the regulations on steel sheet materials;
--- In the method of treating the steel plate, a method of treating the test plate and the phosphating test plate with an aqueous cleaning agent cleaning method is added;
--- Added a method of circular mechanical grinding and linear grinding in the method of grinding steel plate;
--- In the regulations of the tinplate iron material, the nominal thickness is changed from 0.30mm to 0.20mm~0.30mm, and the tin plating is cancelled.
Quantity regulation;
--- In the method of treating tinplate, a method of treating the test plate by using an aqueous cleaning agent cleaning method is added;
--- Increased regulations for galvanized and zinc alloy sheet materials and treatment methods;
---In the method of processing aluminum plate, the water-based cleaning agent cleaning method is used to treat the test plate, the chromate conversion film is used to treat the test plate, and the non-chromium is treated.
a method for treating a test plate with a salt conversion film;
--- Change asbestos cement board to fiber reinforced cement board, and stipulate the use of non-asbestos fiber cement slab;
--- Deleted the contents of the original Appendix A, and changed the general description of the original Appendix B using the spray cleaning method to prepare the steel test plate to the current one.
Record A general instructions for the treatment of steel plates by jet cleaning method and the contents are more detailed;
--- Change the content of Appendix B to the characteristics of zinc and zinc alloy coatings;
--- Change the content of Appendix C to the technical difference between this standard and ISO 1514.2004 and its reasons;
--- Added references.
Appendix A, Appendix B and Appendix C of this standard are informative annexes.
This standard was proposed by the China Petroleum and Chemical Industry Association.
This standard is under the jurisdiction of the National Coatings and Pigments Standardization Technical Committee (SAC/TC5).
This standard was drafted. CNOOC Changzhou Coating Chemical Research Institute.
The main drafters of this standard. Wu Hao, Tang Yu.
This standard was first published in 1988.
Introduction
For many of the most widely used test methods in the field of paints and varnishes, the type of test panels used and the type of test panels used
Specific methods can greatly affect the test results. Therefore, the test panels and the pre-painting test panels are processed as finely as possible.
Standardization of the line is very important. It is also desirable to minimize the number of different "standard panels" required for coating laboratories.
It is impossible to include all types of test panels required for coating testing in a standard, and in the selection of this standard.
There are three different situations when specifying the test panel and its processing method.
In the first case, paints, varnishes, or other products are tested for a specific industrial application. This test is most convenient.
Is a test plate or substrate that is very consistent with the actual industrial application (optional materials, cleaning operations and subsequent surface treatments such as spraying)
Sand or chemical pretreatment). In this case, the selection of the board only needs to explain the following.
a) that the parties concerned should agree in advance on the substrate material and the method used to treat the substrate;
b) The above should be stated in the test report.
The second case is for the test. The test method requires the use of a special test plate specially designed for this test, for example,
Gloss requires an optical planar test panel. In this case, the detailed provisions of the test panels and their treatment methods shall be in the relevant test side.
Explain in the law.
The third case is different from the above two cases. In this case, the product needs to be tested on an agreed surface with good reproducibility.
test. The materials used are preferably of a quality standard and can be easily cleaned or otherwise treated so that
Provide a consistent surface. This surface may not necessarily be the type of surface used in the actual application of the product.
This standard is for the third case, which has developed a test plate processing method that is considered to be reproducible, and because of the lack of international
Additional explanations are given for questions that may exist in a unified approach.
Paint and varnish standard test panels
1 Scope
This standard specifies several different types of standard test panels, and specifies the treatment methods before painting. These standard test panels are used for color paint and clearing.
In the general test method for paints and related products.
The following standard test boards are specified.
a) Steel plates can be treated as follows.
1) Wash with solvent;
2) Wash with an aqueous cleaning agent;
3) sanding;
4) Phosphating treatment;
5) Jet cleaning (for instructions only).
b) Tinplate can be treated as follows.
1) Wash with solvent;
2) Wash with an aqueous cleaning agent;
3) Use sanding (buffing).
c) Galvanized sheet can be treated as follows.
1) Wash with solvent;
2) Wash with an aqueous cleaning agent;
3) sanding;
4) Chemical treatment.
d) Aluminum panels can be treated as follows.
1) Wash with solvent;
2) Wash with an aqueous cleaning agent;
3) sanding (buffing);
4) Chromate conversion film.
e) Glass plates can be processed as follows.
1) Wash with solvent;
2) Wash with a cleaning agent.
f) Hardboard.
g) Gypsum board.
h) Fiber reinforced cement board.
Note. It has been agreed that the test product may also be provided using test panels made of other materials or otherwise treated.
2 Normative references
The terms in the following documents become the terms of this standard by reference to this standard. All dated references, followed by all
Modifications (not including errata content) or revisions do not apply to this standard, however, parties to agreements based on this standard are encouraged to study
Is it possible to use the latest version of these files? For undated references, the latest edition applies to this standard.
GB/T 700-2006 Carbon structural steel (ISO 630.1995, NEQ)
GB/T 2520-2000 cold rolled electroplated tin steel sheet (eqv ISO 11949..1995)
GB/T 3880.1-2006 Aluminium and aluminium alloy sheets and strips for general use - Part 1 . General requirements
GB/T 6682 Analytical laboratory water specifications and test methods (GB/T 6682-2008, ISO 3696.1987, MOD)
GB 12626.2-1990 Technical requirements for hardboard (neq ISO 2695.1976)
JC/T 412.1-2006 Fiber cement slabs - Part 1. Non-asbestos fibre cement slabs
ISO 10546.1993 Chemical conversion coatings - leaching and non-rinsing chromate conversion coatings on aluminium and aluminium alloys
3 steel plates
3.1 Materials
The steel plate to be used for the general test (for the steel plate required for the test for special construction and use) shall be a flat low carbon steel plate.
Or steel bars are cut. The steel plate shall be free from rust, scratches, stains, discoloration and other surface defects. The size of the steel plate should be tested
The provisions of the law may be agreed upon separately. Unless otherwise agreed, the steel plate may be of the grade Q195 or Q215 specified in GB/T 700-2006.
Cold-rolled steel sheet; or cold-rolled steel sheet with tensile strength not less than 270 MPa and elongation after fracture of not less than 31%.
Note. If the steel plate requires blast cleaning, the instructional instructions for blast cleaning are given in Appendix A (see 3.7).
3.2 Storage before test plate processing
The test panels should be stored in a non-corrosive environment prior to disposal. A suitable method is to wrap the test board in a paper treated with a gas phase rust inhibitor.
Or the test panels are stored in an appropriate manner in an additive-free, light neutral mineral oil or hydrocarbon solvent to prevent rust.
Note. For example, each test piece is individually immersed in oil or coated with oil and then wrapped with oil-impregnated paper to wrap each sample separately. Another storage method is to store the test board.
In a desiccator containing some effective desiccant (eg silica gel).
3.3 Cleaning the test plate with solvent
Wipe off excess oil on the test panel first, then thoroughly wash the test plate with a suitable solvent to remove all traces of oil.
Note. Solvents that are more volatile can be used as long as they are neither acidic nor alkaline and can avoid toxicity hazards.
Make sure to remove any fine fibers left in the cleaning cloth during the cleaning process and replace the cleaning cloth at regular intervals to
Avoid distributing oil to the sample again. Do not contaminate the cleaned test panels. The cleaned sample is dried as follows. Let the wash solvent
Volatilize; lightly dry with a clean linen cloth, or dry the test plate with a stream of hot air; if necessary, gently heat the test plate to remove traces
Condensate marks.
If you are handling a large number of test panels, you should carefully check the cleanliness for every 20 test panels. a recommendation for checking cleanliness
Method. Wipe the test board with a clean white paper towel. If there is no stain on the paper towel, the cleaning operation is considered to be satisfactory. If you check the test board
If there is any stain on it, all the test panels after the last wipe test should be cleaned again.
If the clean test panel cannot be painted immediately, store it in a dry and clean environment, such as a desiccator with an effective desiccant.
Until used. It is also possible to wrap the test panel in a paper treated with a vapor phase rust inhibitor.
3.4 Cleaning the test plate with an aqueous cleaning agent (spray or soak operation)
The test panels are cleaned with a commercially available aqueous alkaline cleaner. It is recommended to use a spray operation or a soaking operation. And follow
The detergent manufacturer's requirements adjust the concentration and temperature of the cleaning agent.
Cleaning with the spray method requires the following 4 steps.
a) Clean each side of the test panel for a period of not less than 10 s. Adjust the temperature and spray of the cleaning agent according to the requirements of the cleaning agent manufacturer
pressure.
b) Rinse each side of the test plate with tap water and take measures to ensure that there is no significant contamination of the water during the flushing process. Put clean tap water
It can be achieved by entering the reservoir and then allowing the water to overflow continuously or intermittently from the pool.
c) Rinse each side of the test plate with deionized water with a conductivity not exceeding 20 μS/cm.
d) Immediately after rinsing, place the test panels in an oven or hot air stream for forced drying.
If handling large quantities of test panels, the cleanliness of the test panels should be carefully checked periodically. In addition to the method specified in 3.3, use clean
A white paper towel wipes the test panel, and the test panel washed with the aqueous cleaning agent can also be subjected to a water drop test. Water droplets are not suspended on the surface of a clean test panel.
Soak the test plate in distilled water or deionized water for a while, and take out the test plate. The surface of the cleaned test plate will form a continuous unbroken water film.
It does not shrink into discrete water droplets or water droplets.
3.5 grinding method
3.5.1 General
Some test lacquers need to be carried out on a more uniform and more reproducible surface than machine-rolled steel sheets. In this kind of
In the case, the surface roughness and surface dirt must be removed by mechanical grinding. To ensure complete removal of dirt and surface irregularities,
The original surface layer must be completely removed. The amount of surface layer that needs to be removed depends to some extent on the initial surface finish, but in general
In case, it should not be less than 0.7μm, which can be determined by the reduction of the quality of the test plate (the mass loss per unit area is 5g/m).
2~6g/m2
At the time, it is approximately equal to the thickness reduction of 0.7 μm).
Prior to sanding, clean each test panel as specified in 3.3 or 3.4. Unless otherwise agreed, in accordance with the provisions of 3.5.2 to 3.5.4
Clear the surface layer.
Note. Mineral solvents can also be used as lubricants for grinding operations, as previously agreed.
3.5.2 Manual sanding
The manual dry grinding operation is carried out with 400 water sandpaper, and the suitable operation sequence for manual sanding is as follows.
a) smooth and evenly sand the test plate in a direction parallel to either side;
b) grinding in a direction perpendicular to the first grinding until the original wear scar is worn away;
c) Grinding in a circular motion with a diameter of 80mm to 100mm until the resulting wear scars are just overlapping circles.
3.5.3 Circular mechanical grinding
The mechanical sanding operation was carried out on a mechanical device using a No. 400 water sandpaper. When using this method, the diameter is about 80mm ~ 100mm
The circular motion method is used to polish the test panel. When the trace of the original surface or any unevenness is not visible, the sanding operation is considered complete.
3.5.4 Straight grinding
The original surface layer is removed by a transfer system that secures the belt to the vertical sanding head to obtain a linear sanding surface. Abrasive belt
The surface is sanded to remove surface contaminants and provide a more uniform, reproducible surface than typical rolled surfaces. Polished test panel
The surface roughness (R犪) should be between 0.50 μm and 1.14 μm. P100 alumina abrasive belt is suitable for this operation.
3.5.5 Inspection and cleaning
Inspect the polished test panels to ensure that the original surface layer is completely removed. Thoroughly cleaned in accordance with the method specified in 3.3 or 3.4
The test panels are ground to ensure that any loose sand, steel scrap and other contaminants are removed. Do not stain the cleaned test panels.
If it is not possible to paint immediately, store the cleaned test panels in a dry, clean environment. In a desiccator with an effective desiccant,
Until used. The test panels can also be wrapped in paper that has been infiltrated with a gas phase rust inhibitor.
3.6 Phosphating treatment test board
3.6.1 General
As a patented compound or process, the phosphoric acid conversion coating can be obtained from a number of sources, either by spraying or impregnation. By production
The quotient describes the phosphating process. The treatment of the test panel may consist of one or more steps in the conditioning of the surface state before washing, rinsing and phosphating.
Additional rinsing is usually carried out after the phosphating treatment. If a phosphating test panel is to be used, it can be obtained by one of the following treatment methods.
3.6.2 Crystalline zinc phosphate treatment
The conversion membrane treatment involves reacting a steel surface with an acid zinc phosphate solution containing an oxidizing agent and a catalytic salt. Conversion of steel surface to crystalline phosphorus
An acid salt conversion film which suppresses corrosion and increases the adhesion and durability of the subsequently applied paint film. Spray, impregnation or soft
Brush or nylon brush treatment. The temperature and concentration of the solution and the time of contact with it vary with the method of treatment and should be based on
Learn from the reagent manufacturer's recommendations to maintain the specified values. The color range of the zinc phosphate conversion film is usually from gray to grayish white.
3.6.3 Amorphous iron phosphate treatment
The conversion membrane process involves reacting a steel surface with an acid phosphate solution containing an oxidizing agent and a catalytic salt. Conversion of steel surface to amorphous phosphoric acid
The iron conversion film, which can improve the adhesion of the subsequently applied coating, but has a lower effect of inhibiting corrosion than the crystalline zinc phosphate conversion film. Available
It is treated by spraying and dipping. The temperature and concentration of the solution and the time of contact with it vary with the method of treatment and should be based on chemical testing
The manufacturer's recommendations are to maintain the specified values. The color range of the iron phosphate conversion film is usually from yellowish blue to purple.
3.7 Spray cleaning method
Prior to blast cleaning, the test panels are cleaned as specified in 3.3 or 3.4.
A general guidance note on the treatment of steel sheets by blast cleaning is given in Appendix A.
Note. However, it should be emphasized here that the test plate treated by the jet cleaning method is not suitable for the general-purpose cold rolled steel sheets specified in 3.1.
4 horse mouth iron plate
4.1 Materials
The test plate shall be a tinplate with a surface quality of Class I, which meets the requirements of GB/T 2520-2000. The nominal thickness is 0.20mm~
0.30mm, hardness value T52 (double-sided uniform tin plating). The main techniques for the tinplate used can be recorded in the test report when needed.
parameter.
4.2 Cleaning the test plate with solvent or aqueous cleaning agent
When the tinplate is stored, it does not have to be specially protected like a bare steel plate. However, the surface of the test panel may be due to processing
It is contaminated with a lubricant. Therefore, it is recommended that the test panels should be cleaned by the method specified in 3.3 or 3.4 before use.
Note. Although solvent cleaning and aqueous cleaning agent cleaning cannot remove all organic matter after tin plating, it has been found that this residue is accurate to the test results.
The degree has little effect.
4.3 grinding method processing test board
If it is required to use a test surface that is more uniform than the test plate after solvent cleaning or aqueous cleaning, it is recommended to use the grinding method.
Tinplate, this grinding operation is carried out like a steel plate (see 3.5), the difference is that the grinding action should be much lighter, so as not to embed the sand powder into the table.
Face and avoid grinding all tin plating at any point. Therefore, it is recommended to use high quality fine sandpaper, such as No. 500 water sandpaper.
The sanding operation is carried out until the entire surface of the test plate is covered with a plurality of polished circle marks superimposed on each other, and the original surface is shaped like meat.
The eyes are no longer visible.
Thoroughly clean the polished test panels in accordance with the method specified in 3.3 or 3.4 before use to ensure that all loose ones are removed.
Sand, tin shavings and other dirt, do not stain the cleaned test panels.
If it is not possible to paint immediately, store the cleaned test panels in a dry, clean environment. In a desiccator with an effective desiccant,
It is also possible to wrap the test panel in a paper treated with a vapor phase rust inhibitor until use.
5 galvanized and zinc alloy plates
5.1 Materials
The test panel is a cold rolled carbon steel plate coated with zinc or a zinc alloy. The special type of zinc or zinc alloy coating, the thickness and size of the board should be both
Agreed. Different types of zinc and zinc alloy coatings are described in Appendix B.
There should be no chemical passivation film on these plates as this treatment film will affect the adhesion of the subsequently applied coating.
To prevent wet storage rust (or white rust) on the galvanized surface during storage, the plate is usually applied in the factory as a sodium dichromate solution.
A passivating agent present in the form. If the passivation film is not removed, it will affect the adhesion of the coating applied later. To obtain unpassivated plating
Zinc steel sheets usually need to be ordered from the factory. If this is not possible, the passivation film can be removed by sanding as specified in 4.3.
5.2 Solvent cleaning treatment
If you need to use a clean test plate but do not need further processing, you can follow the cleaning method specified in 3.3.
5.3 Aqueous cleaning agent cleaning treatment
If a clean test panel is required but no further processing is required, it can be cleaned as specified in 3.4. Usually cleaning galvanized
When the steel plate is used, the concentration and temperature of the cleaning agent should be lower, and the contact time should be shorter. Because the high concentration alkaline cleaner will erode the galvanized layer, it is used to clear
The pH of the alkaline solution of the galvanized steel sheet should be between 11 and 12, and should not exceed 13.
5.4 Chemical treatment method test board
5.4.1 General
If a chemically treated test panel is required, the test panel may be treated in one of the methods given in 5.4.2 to 5.4.4.
5.4.2 Crystalline zinc phosphate treatment
The conversion membrane process involves reacting a zinc surface with an acid zinc phosphate solution containing an oxidizing agent and a catalytic salt. Conversion of zinc surface to crystalline phosphate
A conversion film that inhibits corrosion and increases the adhesion and durability of the subsequently applied paint film. Spray, dipping or soft brush
Or a nylon brush.
5.4.3 Chromate treatment
WARNING. Chromium trioxide is classified as a carcinogen (see EU Directive 67/548/EEC) and may cause cancer by inhalation. To soak the solution or
Spraying the use of chromium trioxide can cause harm to workers. Therefore, take appropriate safety measures when using, most
Use alternative methods or alternatives.
This treatment is carried out by impregnation or spraying using a proprietary dilute solution containing chromium trioxide, other acids and a suitable catalyst.
Composition. This treatment forms a thin amorphous chromium chromate conversion coating on the surface that improves corrosion resistance and film resistance.
Adhesion. This conversion film is different from the film obtained by passivation treatment.
5.4.4 Waterborne organic chromium treatment
Some water-soluble resins, when properly formulated with chromium-containing compounds, can be applied by roller coating or other means such as dip coating or roller coating with a rubber roller.
The way is applied to the zinc surface. This operation can be carried out over a wide temperature range as long as the coating can be carried out according to the requirements of the coating system to be applied.
Bake or cure properly or both. The resulting coating is a corrosion resistant film that enhances the adhesion of the subsequently applied paint film.
6 aluminum plate
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