This standard is applicable to the sampling of raw materials for paints and varnishes. It proposes applicable methods for sampling vegetable oils and other non-volatile liquids, dry powders such as pigments and extenders, and introduces and illustrates the methods used to accurately collect representative samples. Tool of. In special cases, certain modifications to the prescribed methods may be made, provided that the samples obtained accurately represent the batch of product. GB 9285-1988 Sampling of raw materials for paints and varnishes GB9285-1988 Standard download and decompression password: www.bzxz.net

National Standard of the People's Republic of China
Sampling of raw materials for paints and varnishes
Raw materials for paints and varnishes ---Sampling This standard is equivalent to ISO842-1984 "Raw materials for paints and varnishes--Sampling" 》. 1Subject content and scope of application
UDC 667.62: 667
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GB.9285—88
This standard is applicable to the sampling of raw materials for paints and varnishes. Applicable methods for sampling vegetable oils and other non-volatile liquids, dry powders such as pigments and body paint are proposed, and the tools used to accurately collect representative samples are introduced and illustrated. In special cases, some modifications can be made to the prescribed methods, but the samples obtained must accurately represent the batch of products 1. 2 Reference standards
GB37231 General Safety Principles for Sampling of Industrial Chemical Products GB46501 Industrial Chemistry Product Sampling Vocabulary
(GB4756 Petroleum and Liquid Petroleum Products Sampling Method (Manual L Method) 3 Definition
3.1 Production, commodity batch: a certain quantity of materials produced under the same conditions. 3.2 Delivery batch: A certain quantity of material specified by a specific shipping notice or shipping document. 3.3 Sample: A certain quantity of material taken from a batch or delivery that is necessary to measure the performance of the batch or delivery. Data i shall be used.
3.4 ??Large sample and total sample: All materials obtained according to the sampling method. 3.5 Reduced sample: The sample obtained by reducing the sampling method without changing its composition. 3.6. Upper sample: sample taken at a depth of approximately 1/10 below the upper surface of the material in the container. 3.7 Middle sample: sample taken at approximately half the depth of the material in the container. 3.8 Lower sample: approximately above the lowest part of the material in the container. Sample taken at 1/10 depth. 3.9 Bottom sample: Sample taken at the lowest level of the container. 3.10 Weighted sample: A mixed sample in which each sample is mixed in proportion to the amount of material they represent. Note: Meishi. The terminology of Xiangli noodles can refer to GB4650. 4 Safety Measures
4.1 Some raw materials may cause different degrees of danger when sampling, such as flammability and toxicity, so the dangers of certain substances must be referenced. The relevant safety protection should be carried out in accordance with the relevant chapters of GB3723. 4.2 Two people must be present when sampling
4.3 Before taking samples from the railway tanker, it must be ensured that there is no shunting operation and the safety of the vehicle must be ensured. Parking and safety braking. 4.4 In order to avoid the expansion and overflow of certain products with large expansion coefficients and the need for shaking during sampling, and to avoid the adverse effects of excessive space on the upper floor on most categories, the loading volume of the sample should be the container. 80% to 90% of the content. It must be noted that when taking samples, contact with skin and clothing should be avoided as much as possible. The correct handling methods for any toxic substances should be understood in advance, and appropriate antidote should be on hand. 4.5 Ensure that it is necessary. The tank and sampler are well grounded. Approved by the Ministry of Chemical Industry of the People's Republic of China on 1988-04-19
Implemented on 1989-01-01
GB 9285-88
4.6 for flammable powders Do not allow it to remain in the air to avoid explosion and spontaneous combustion. 5 Cleaning and maintenance measures wwW.bzxz.Net
It is necessary to note that all sampling equipment should be clean and dry. Clean the sampling tools with solvent first, and then wash them with soapy water. Rinse with hot water until clean, and finally dry the sampling equipment completely. During the entire sampling process, the operator must ensure that the materials, sampling equipment, sampling containers and samples are free from rain, dust and other external contamination. Materials outside the sampler should be removed before the sampler is discharged. After taking the sample, the sampler should be drained and cleaned immediately.
6 Sample Container
For liquid samples, the sample container used should be a clean and dry colorless or brown glass bottle or metal can. For slurry materials, mixtures of liquid and peripheral materials or solid peripheral materials, wide-mouth bottles or wide-mouth metal cans should be used. And ensure that the sampling container and lid (plug) are made of materials that do not contaminate the sample.
The advantage of colorless glass bottles is that their cleanliness can be visually inspected and the water content or impurities of the sample can be easily observed. Light-sensitive materials can be stored in brown glass bottles. Materials that are particularly sensitive to light should also be protected by placing the brown bottle in a box or wrapping it in black paper. Galvanized or aluminum cans and lids should not be used for alcoholic materials. Rubber stoppers should no longer be used on bottles containing solvent products. Before use, the cork should be wrapped in a protective film such as tin foil or aluminum foil. Make sure the cork, aluminum foil, and tin foil are intact. Avoid contact of cork with sample. If the bottle uses a ground glass stopper, you need to check whether the bottle will leak after the stopper. If a screw cap is used, it is better to wrap the inner log gasket with a protective film such as tin or aluminum foil. Aluminum foil should not be used for alcoholic substances.
Sampling equipment
7.1 Type and structure
To ensure that the sampling equipment is not corroded by the product and is easy to clean, it can be made of stainless steel, brass or glass. Metal products containing copper should not be used when dispensing vegetable oils. The surface of the sampler should be smooth with no scratches or grooves. Several sampling equipment are described below. The liquid sampler is shown in Figures 1 to 10, and the body powder sampler is shown in Figure 11. 7.2 Oil and volatile liquid sampler | Liquids are made in various sizes. The samplers described in 7.2.6 to 7.2.9 are manufactured in a wide range of sizes. 7.2.1 Sampling bottle (see Figure 1)
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Figure 1
Sampling bottle
This type of sampling The bottle is a weighted glass bottle with a capacity of 300 to 500 mL, a detachable stainless steel or brass sampling jar, and the bottle or jar has a removable stopper or lid connected with a suitable chain, rod or rope. The device can be lowered to various depths as required, at which point the plug is removed to allow the container to be filled with liquid sample. This device is suitable for sampling large tanks. 7.2.2 Flip-type sampling tube (see Figure 2)
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(a) 'Down position
GB 9285-88
Figure 2 Flip-type sampling tube|| tt||(b) Filling position
This device is...a cylinder with a length of 150mm and a diameter of 50mm. It has an extended part at the closed end and a strong wire handle at the open end. With a small metal hook and a rope, invert the cylinder to the position shown in Figure 2(a) and insert the hook into the hole to maintain that position. Then it sank into the liquid armor in the tank, and at the required depth, the rope was pulled sharply. The round slip returns to its normal upright position, and the tube is filled with liquid [Figure 2(b)]. 7.2.3 Sampling cylinder (see Figure 3)
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Figure 3 Sampling cylinder
Enlarged cross-section of the valve
This device is a A cylinder with an open top and a valve at the bottom. As the sampling cylinder descends through the liquid, the valve remains open to ensure a steady flow of liquid through the cylinder.
When the descent stops, the valve is closed, and the sampling tube takes out the liquid sample that has reached the depth. 7.2.4 "Godevil" (see Figure 4) This instrument is a bottle with a special weight at the bottom. Its length is 300mm, the diameter of the body is 75mm, and the diameter of the neck is 25mm. There is a chain attached to it. Attached to the handle in the middle of the bottle. When it is placed in a liquid in a tank, it falls so fast that it does not start filling with liquid until it reaches a certain fixed position. 420
7.2.5 Bottom or area sampling bottle (see Figure 5) GB 9285-88
Figure 4 "Ghost style" sampling bottle
The capacity of this sampling bottle is 300~500mL , made of stainless steel or brass. Samples can be taken from any horizontal surface in ground storage tanks and tank trucks. There is a feed port at the bottom of the sampling bottle, and the central axis has a central pull rod with a bottom valve. The sampling bottle and the central pull rod are respectively tied by two distinguishable stainless steel chains of sufficient length.
When taking the bottom sample, the sampling bottle is lowered to the bottom of the storage tank, the center lever bottom valve can be automatically opened, and the liquid enters the sampling bottle from the feed port under the sampling bottle. When the sampling bottle is lifted, the bottom valve automatically closes. When taking a liquid sample at any depth, the sampling bottle is lowered to the required depth, and then the center rod chain is pulled to open the valve. After the liquid is filled with the sampling bottle, the center rod chain is released, the bottom valve is closed, and the upper bottle chain is lifted out. Sampling bottle. 421
7.2.6 Sampling tube (see Figure 6 and Figure 7)
GB9285-88
Figure 5 Bottom or area sampler (section view) The sampling tube shown in Figure 6 is two concentric metal tubes. The two fit closely throughout their length, and one tube can rotate within the other. Both tubes have a long longitudinal opening or a series of openings cut into a width of about one-third of the circumference. Short opening. The tube is opened at a certain position and liquid is injected. By rotating the inner tube, it becomes a closed container. The diameter of the inner tube is 20~40mm, and the entire tube can be completely connected. In this case, the two tubes form a V-shaped opening at the bottom end, so that when the longitudinal opening is opened, the liquid contained in the sampler can pass through V-shaped opening release. Or the inner tube is also cross-sectioned into 3 to 10 sections, so that the bottom does not need to be open. This arrangement can separate liquid samples taken out at different depths in the container.
The sampling tube should be of sufficient length to reach the bottom of the barrel or container. It should be closed when inserted, then opened to allow liquid to enter, and finally closed again to remove it.
The sampling tube shown in Figure 7 is used to select liquid samples with known uniformity. It is composed of a metal tube or a thick-walled glass tube. Its diameter can range from 20 to 40mm, and its length varies from 400 to 800mm. Its upper and lower ends are conical and gradually shrink to about 5 to 10mm downwards. , there are two rings on the upper end used as handles. When selecting a single sample, first block the top of the tube with a thumb or plug and lower it to the required depth, then open it for a while to allow liquid to enter, and finally block the tube and remove it. 422
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Figure 6 Sampling pipe composed of two concentric pipes 423
7.2.7 valve sampling pipe (see Figure 8)
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Figure 7 Single-tube sampling pipe
This is a metal pipe with a valve at the bottom and connected to the top spiral handle through a central rod. When the handle is turned downward, the valve remains closed. The difference between it and the sampling tube mentioned above is that it is inserted into the liquid with the valve open. When the sampling tube sinks below the liquid level, liquid is allowed to enter, and the displaced air is discharged through the air hole at the top of the tube. This valve automatically closes when the bottom end of the tube touches the bottom of the container. The handle is then tightened so that the valve remains closed and the tube containing the sample is removed. If the cleaning device is not used (as described in 7.2.9), the outside of the pipe shall be wiped clean. For different situations, different lengths of sampling tubes can be used. A 2m long aluminum pipe is convenient for tank truck sampling. This instrument is not suitable for sampling products with accumulated sediment. 424
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