Some standard content:
1 Scope
Chemical Industry Standard of the People's Republic of China
Fluorescent whitening agent CXT
Fluorescent whitening agent CXTHG/T 3675—2000
This standard specifies the requirements, sampling, test methods, inspection rules, and marking, labeling, packaging, transportation and storage of fluorescent whitening agent CXT (C.1 fluorescent whitening agent 71).
This standard applies to fluorescent whitening agent CXT synthesized by condensation of cyanuric chloride, 4,4-diaminobenzyl-2,2'-disulfonic acid, aniline and morpholine. This product is mainly used for whitening synthetic detergents, cotton fibers and their fabrics. Structural formula:
Molecular formula: C4o H: N12 O. S2 Na2-HN
-CH-CH
Relative molecular mass: 924.93 (according to the 1997 international relative atomic mass) Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 2374- -1994
GB/T 2381--1994
GB/T2383---1980
GB/T 2386--1980
GB/T1250—1989
GB/T 6682—1992
3 Requirements
General conditions for dyeing determination
Determination method for insoluble matter content in dyes
Determination method for sieving fineness of dyes
Determination method for water content in dyes and dye intermediates Expression and judgment method of limit values
Specifications and test methods for water used in analytical laboratories (negISO3696:1987) The quality of fluorescent whitening agent CXT shall comply with the requirements of Table 1. Table 1 Quality requirements for fluorescent brightener CXT
Ultraviolet absorption (expressed by E\)
Brightening intensity (for standard product), points
Approved by the State Administration of Petroleum and Chemical Industry on June 5, 2000 400
For detergents
For textiles
White or light yellow uniform powder
Implementation on March 1, 2001
Color (with standard product)
Moisture content, %
Content of impurities insoluble in water, %
Fineness (content of residue passing through 425um aperture sieve), % Note:
1) Converted to absorbance value with a concentration of 10g/L. 4 Sampling
HG/T 3675-2000
Table 1 (end)
For detergents
For textiles
Approximately ~ micro
Sampling is done in batches. The manufacturer takes the products that are mixed evenly at one time as a batch. The number of sampling barrels in each batch shall not be less than 10%, and the sampling of small batch products shall not be less than 3 barrels. The packaging of the products must be intact. When sampling, do not allow foreign impurities to fall into the products. Use a probe to sample from the upper, middle and lower parts of the barrel. The total amount of samples taken shall not be less than 200g. After the samples are fully mixed, they are placed in two clean and dry brown ground-mouth bottles, sealed with paraffin, and labels are attached to the bottles, indicating the manufacturer name, product name, batch number, sampling date and location. One bottle is used for inspection and one bottle is kept for reference.
5 Test methods
Unless otherwise specified, the reagents used in this standard are analytically pure reagents. The test water should meet the third-grade water specification in GB/T6682. The test results are determined according to the rounded value comparison method in GB/T1250-1989. 5.1 Appearance determination
Visual determination is adopted.
5.2 Determination of ultraviolet absorption
5.2.1 Principle of the method
According to the Lambert-Beer law, when the sample thickness (optical path) is fixed, the incident light wavelength and other conditions remain unchanged, then the absorbance measured within a certain concentration range is proportional to the concentration of the substance to be tested in the solution. 5.2.2 Instruments and reagents
Spectrophotometer: Domestic 751G visible ultraviolet spectrophotometer or other models of instruments with the same performance and accuracy. Balance: Sensitivity 0.0001g.
Volume flask: brown, 1000mL, 100mL. Colorimetric III: quartz, 10mm.
Dimethylformamide (DMF).
Sodium hydroxide solution: 0.4g/L.
5.2.3 Determination methodbzxZ.net
Weigh about 0.15g (accurate to 0.0001g) of fluorescent whitening agent CXT sample, place it in a beaker, add 3mL DMF to dissolve it, transfer it to a 1000mL volumetric flask, dilute it to the scale with sodium hydroxide solution, shake it well; then use a pipette to draw 10mL of the solution and place it in a 100mL volumetric flask, dilute it to the scale with sodium hydroxide solution, shake it well, and immediately use a 10mm quartz colorimetric III with sodium hydroxide solution as the reference solution at a temperature of (25±5)℃ and outside the maximum absorption wavelength (350nm) to determine the absorbance A of the sample solution. Note: 1 During the determination process, from weighing, dissolving, diluting to measuring absorbance, the operation must be continuous and should not be left for too long to avoid the sample being exposed to light and affecting the determination result.
2 When weighing, preparing and measuring samples, the room should be properly protected from light and sunlight. 5.2.4 Expression of analysis results
HG/T 3675-2000
Ultraviolet absorption is represented by E, which is the absorbance value measured by 10 mm colorimetric blood after conversion to a concentration of 10 g/L. The ultraviolet absorption E of fluorescent whitening agent CXT is calculated according to formula (1): E
Where: A—absorbance value when the test solution concentration is c; test solution concentration, g/L.
The difference between the two parallel determination results of E is not greater than 10. The arithmetic mean is taken as the measurement result. 5.3 Determination of whitening intensity and color light
5.3.1 Reagents and materials
Standard bleached cotton cloth or cotton yarn for dye test. Anhydrous sodium sulfate solution: 100 g/L.
Dimethylformamide (DMF).
5.3.2 Fabric pretreatment
Put cotton cloth or cotton yarn in water and boil for 15 min, take it out, rinse it with water, squeeze it dry and set aside. 5.3.3 Preparation of dye bath
. (1)
Weigh 0.5g (accurate to 0.0005g) of fluorescent whitening agent CXT standard sample and test sample and put them into a beaker, add 10mL DMF to dissolve them respectively, transfer them to a 1000mL volumetric flask, dilute to the mark with water, take 50mL of the solution, transfer it to a 500mL volumetric flask, dilute to the mark with water, shake well and set aside.
Prepare dye bath according to Table 2, the dyeing depth is 0.05%, use 5g cotton cloth or cotton yarn for dyeing, and the bath ratio is 1:40. Table 2 Preparation of dye bath
Dyeing vat number
0.025g/500mL Standard dye solution
0.025g/500ml. Sample dye solution
100g/L Anhydrous sodium sulfate solution
Add distilled water to
5.3.4 Dyeing operation
After the dye bath is prepared, place the dye vat in a water bath to prepare for dyeing. Dye the cotton cloth (or cotton yarn) in the order of the dye vat number and keep turning it over. Raise the temperature to 80℃ within 30min, continue dyeing at this temperature for 30min, and take out in the order of dyeing after dyeing, wash with water, and dry. 5.3.5 Evaluation of whitening intensity and color light
Carry out according to the relevant provisions in GB/T2374. 5.4 Determination of moisture content
According to the relevant provisions of "drying method" in GB/T2386-1980. 5.5 Determination of impurity content not bathed in water
According to the relevant provisions in GB/T2381. 5.6 Determination of fineness
According to the provisions in GB/T2383, the aperture of the standard sieve is 425um. 6 Inspection rules
6.1 Factory inspection
Fluorescent brightener CXT products should be inspected by the quality inspection department of the manufacturer. The manufacturer should ensure that all products shipped meet the requirements of this standard, and each batch of products shipped should be accompanied by a quality certificate in a certain format. 6.2 Re-test
HG/T3675—2000
If one of the indicators in the test results does not meet the requirements of this standard, samples should be taken from the double amount of packaging for re-testing. Even if only one indicator in the re-test results does not meet the requirements of this standard, the entire batch of fluorescent brightener CXT products cannot be accepted. 6.3 User Inspection
The user unit has the right to inspect and accept the fluorescent whitening agent CXT products received in accordance with the provisions of this standard to check whether they meet the requirements of this standard.
7 Marking, labeling, packaging, transportation and storage 7.1 Marking, labeling
The packaging barrels of fluorescent whitening agent CXT products should be painted with firm and clear markings, indicating the manufacturer's name, factory address, product name, registered trademark, standard number, batch number, production date, gross weight and net weight. Each package of the product should be accompanied by a label of a certain format, indicating the product name, manufacturer's name, registered trademark, proof that the product meets the requirements of this standard and the standard number. 7.2 Packaging
Fluorescent whitening agent CXT products are packaged in iron barrels or paper barrels lined with plastic bags, with a net weight of 25kg per barrel. Other packaging can be negotiated and determined with the user.
7.3 Transportation and Storage
During transportation, the fluorescent brightener CXT products should be kept away from collision and exposure to sunlight, and should be stored in a cool, dry and ventilated warehouse. The shelf life is years. Products that are over one year old should be re-inspected before leaving the factory. 403 | | tt | 5
GB/T 1665--1995
GB/T 1668-
—1995
GB/T 1669--2001
GB/T 1670--1988
GB/T 1671—1988
GB/T 1672—1988
GB/T 1676--1981
GB/T 1677--1981
GB/T 1678---1981
GB/T 5543--1985
GB/T 5544—1985
GB/T 554 5-—1985
GB/T5546—1985
GB/T 5547—1985
GB/T 5548-1985
GB/T 6489.1—2001
GB/T6489.2—2001
GB/T 6489.3--2001
GB/T 6489. 4—2001
GB/T 6691-1986
GB/T 6692--1986
GB/T 8826—1988
GB/T 8827--1988
GB/T 8828—1988
GB/T 8829--1988
GB/T 9338—1988
GB/T 9340—1988
GB/T 10661—1996
List of chemical additives standards and replacement information Replaced standard number
GB 1658—1979
GB 1659—1979
GB1660—1979
GB1661—1979
GB/T 1663-1982
GB/T 1662—1981
GB1664—1981
GB 1 673—-1981
GB1665—1981
GB 1668-1981
GB 1674—1981
GB 1675—1981
GB/T 1669-1988
GB 1670—1981
32 |GB GB 1671--1981
37GB1672—1981
40GB 1676--1979
GB1677—1979
GB 1678—1979
Current standard number
GB/T 11405--1989
GB/T 11406-
GB/T 11407—1989
GB/T11408—1989
GB/T 11409. 1--1995
GB/T 11409.2--1995
GB/T11409.3—2003
GB/T 11409. 4---1989
GB/T 11409.5—1989
GB/T 11409.6-2003
GB/T 11409.7--1989
GB/T 11409.8—1989
GB/T 11409.9— 2003
GB/T 12028—1989
GB/T 12029. 1—1989
GB/T 12029.2—1989
GB/T 12029.3-1989
GB/T 12029, 4--1989
GB/T12029.5-1989
GB/T 12029. 6—1989
GB/T 18951-2003
GB/T 18952—2003
GB/T 18953--2003
HG/T 2074—1991
HG/T 2091---1991
GB/T 6489.1—1986
HG/T 2092—1991
GB/T 6489.2-1986
GB/T6489.3—1986
GB/T 6489.4-1986
219GB/T10661-1989
HG/T 2093---1991
HG/T 2094--1991
HG/T 2096--1991
HG/T 2097--1991
HG/ T 2281--1992
HG/T 2334--1992
HG/T 2337—1992
HG/T 2338-1992
HG/T 2339—-1992
HG/T 2340—1992
HG/T 2341--1992
HG/T 2342--1992
Replaced standard number
GB/T11406-—1989
GB/T 11409.1—1995
GB/T 11409.2--1995
GB/T 11409.3---1989
97 |GB/T 11409.6--1989
104/GB/T 11409.9-—1989
Current standard number
HG/T 2343—1992
HG/T2344
—1992
HG/T 2345--1992
HG/T 2423—1993
HG/T 2424—1993
HG/T 2425--1993
HG/T 2426—1993
HG/T 2554-1993
HG/T 2555--1993
HG/T2556—1993
HG/T 2564-1994
HG/T 2590—2000
HG/T 2591—1994
HG/T 2670--1995
HG/T 2671—1995|| tt||HG/T 2688—1995
Replaced standard number
348HG2-379-—1980
Current standard number
HG/T 2689—1995|| tt||HG/T 2744--1996
HG/T2862—1997
HG/T 2994—1987(1997)
HG/T2995—1987(1997)
HG/T2996-1987(1997)
HG/T 3017—1988(1997)||tt| |HG/T 3018—1988(1997)
HG/T 3502—1989
HG/T 3503—1989
HG/T 3504—1990
HG/ T 3643-1999
HG/T 3644—1999
HG/T 2-316--1982HG/T 3667--2000352
HG/T 2-381—1982
HG/T3675—2000
HG 2-528-1983
Replaced by the standard push number|| tt||HG 2-529---1967
GB 7768--1987
GB 7769—1987
GB 7770-1987
GB 1679-1988|| tt||GB 1680—1988
ZB G71 006—1989
380ZBG71005-1989
ZB G71 008—1989
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.