This standard is developed in accordance with the regulations given in GB/T 1.1-2009.
This standard replaces GB/T 13174-2008 "Determination of detergency and cycle of washing property for laundry detergents". The following main technical changes have been made with respect to GB/T 13174-2008:
-- Refined the type requirements of whiteness meter;
-- Modified the used reagents, materials and preparation process of JB-03;
-- Deleted JB-04 and JB-05;
-- Modified the reference washing powder formula;
-- Merged the contents of Annex A to Annex D in the original standard into Annex A, added Annex B "Types and Production Requirements of Reference Detergents", revised Annex G and Annex H in the original standard into Annex D and Annex E respectively, and added Annex C "Technical Parameters of Rinse Controller", while deleted Annex E and Annex F in the original standard.
This standard was proposed by China National Light Industry Council.
This standard is under the jurisdiction of the National Technical Committee on Surfactant Soap and Detergent of Standardization Administration of China (SAC/TC 272).
The previous editions of the standards replaced by this standard are as:
--GB/T 13174-1991, GB/T 13174-2003, GB/T 13174-2008;
--GB/T 15815-1995.
Introduction
In the revision of this standard, the relevant contents in ISO 2267:1986 and ISO 4312:1989 were referred, considering the actual conditions and industrial characteristics of the state, some specific procedures in the testing were completed and detailed, and some principal requirements in ISO 2267:1986 and ISO 4312:1989 were simplified, as well as the matters hardly used in practical situations and hard to be uniformly grasped. Since the detergent performance evaluation results are subject to the influence of such factors as instruments, equipment, test methods, test materials, reagents and ambient conditions and some factors cannot be repeated, the test results are difficult to reappear and their test errors relative to conventional analysis methods are relatively larger. Users of this standard shall further explore and coordinate the consistency of determination conditions and try to ensure the consistency of actual determination (test) results.
On the basis of unifying conventional testing conditions such as type of detergency testing machine, wash temperature and time and hardness of water, this standard only gives guiding opinions without explicit restrictions on the use concentration of the tested detergent products under the test conditions, the types and concentrations of reference detergents, and the quantity and varieties of JB series test cloth, which should be specified when cited by specific product standards.
Determination of detergency and cycle of washing property for laundry detergents
1 Scope
This standard specifies the method of detergent detergency evaluation by detergency test with artificial test cloths and detergent anti-soil-redeposition property evaluation by comparing cycle washing with unsoiled cotton cloth.
This standard is applicable to the detergency and anti-soil-redeposition property evaluation for laundry detergents products.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document (including any amendments) referred to applies.
GB/T 210.1-2004 Specification and determination methods of sodium carbonate for industrial use-Part 1: sodium carbonate for industrial use
GB/T 4209-2008 Sodium carbonate for industrial use
GB/T 6009-2014 Anhydrous sodium sulfate for industrial use
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 25812 Standard bleached cotton fabric use for dyeing test
HG/T 3268-2002 Triethanolamine for industrial use
JJG 512 Whiteness meter
QB/T 1806-1993 Alkaline proteinase for detergent
QB/T 5481-2019 Detergent builder-Sodium polyacrylate
Pharmacopoeia of the People's Republic of China (Edition 2005)
3 Terms and Definitions, Symbols and Codes
3. 1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
test cloths
they refer to the artificially-soiled cloth pieces, made of white cloths with specified types of stain through certain treatment procedures, used for determining the detergency of detergent
Note: The types of test cloths are determined by the types of stains.
3.1.2
pieces of test cloths
they refer to blocks of test cloths, cut into a certain size round or square as required, used in the detergency test
3.1.3
whiteness index
it refers to the reflectivity of test cloths or test cloth pieces to light wave under the specified wave length, read at 457 nm with a whiteness meter
3.1.4
whiteness index before washing
it refers to the whiteness index of pieces of test cloths before washing with detergent
3.1.5
whiteness index after washing
it refers to the whiteness index of pieces of test cloths after washing with detergent
3.1.6
difference of the whiteness index
it refers to the difference between whiteness index after washing and whiteness index before washing
3.1.7
detergency
it refers to stain-removing ability of a detergent
Note: It is one of the indexes representing the washing property of detergent.
3.1.8
value of detergency
it refers to the digitization representation of detergent detergency
Note: It is represented by difference of the whiteness index.
3.1.9
rate of the value of detergency
it refers to the rate of sample detergent detergency value to reference detergent detergency value
3.1.10
anti-soil-redeposition property
it refers to the ability to inhibit stain in the detergent suspension water from being absorbed on the surface of fabric during the washing process
Note: It is an index representing the washing property of a detergent and may be comprehensively evaluated by two indexes - whiteness preserved and ash deposition.
3.1.11
whiteness preserved
it refers to the whiteness falling conditions of white fabric after washed in the contaminated washing liquid, which represents the stain suspension ability of detergent during the washing process
3.1.12
value of whiteness preserved
it refers to the digitization representation of detergent washing whiteness preserved
Note: It is represented by rate of whiteness before and after washing.
3.1.13
rate of the value of whiteness preserved
it refers to the rate of the washing whiteness preserved values of the sample detergent to the reference detergent
3.1.14
ash deposition
it refers to inorganic solid material absorbed on the fabric after washing for several times. It represents the stain suspension ability of detergent during the washing process
3.1.15
rate of ash deposition
it refers to the rate of sample detergent ash deposition to reference detergent ash deposition
3.1.16
cycle of washing property
it refers to the integral effect conditions of detergent on fabrics after repetitive cycle washing for several times
Note: It may be evaluated comprehensively by whiteness preserved, ash deposition and sense judgment.
3.1.17
reference detergent
it refers to the detergent of specific formulation prepared by the raw materials of certain specification
Note: It is commonly used as the comparison reference to compare and test the washing property of other detergents.
3.1.18
reference proteases
they refer to the proteases of specific specification, which are added into reference detergent in the determination of detergent detergency to increase its detergency to JB-02 (an albumen test cloth)
3.2 Symbols and codes
For the purposes of this document, the following symbols and codes apply.
B: Rate of the value of whiteness preserved
F1: whiteness value of test piece before washing
F2: Whiteness value of the test piece after washing
H: Rate of ash deposition
P: Rate of the value of detergency
R: Value of detergency
S: Ash deposition
T: Whiteness preserved value
JB-00: Unsoiled cotton cloth
JB-01: Carbon black oil test cloths
JB-02: Albumen test cloths
JB-03: Sebum test cloths
4 Test Principle
In the detergency testing machine within prescribed temperature and wash time, prepare detergent solutions of certain concentration with water of certain hardness, wash various pieces of soiled test cloths, determine the whiteness indexes before and after washing pieces of test cloths at selected wave length. The detergency of detergent is evaluated by the difference of the whiteness index.
In the detergency testing machine within prescribed temperature and wash time, prepare detergent solutions of certain concentration with water of certain hardness, prepare and add a given amount of soiled solution, and wash a certain amount of white cloth pieces; Take them out and dry them in the air, repeat the washing process at the specified times (generally above 20 times), sensorially evaluate appearance (roughness), softness and sense whiteness of white cloth pieces after washing, and determine ash deposition (ignition method) and whiteness preserved (calculated by the whiteness before and after washing); Compare these criteria to evaluate the anti-soil-redeposition property of detergent.
5 Reagents and Materials
Unless otherwise specified, during the analysis, only confirmed analytical reagent and Grade 3 water complying with GB/T 6682 are used.
5.1 Calcium chloride CaCl2
Note: calcium chloride including a certain hydration number may be used, but it shall be converted in the actual usage according to the CaCl2 dosage specified in 7.1.
5.2 Magnesium chloride (MgCl2·6H2O)
Note: anhydrous magnesium chloride or magnesium chloride including a certain hydration number may be used, but it shall be converted in the actual usage according to the MgCI2·6H2O dosage specified in 7.1.
5.3 Test cloths: JB series
According to the test purpose, select one or several JB series test cloths listed in Annex A to test the detergency or cycle of washing property. Before using, a test cloth is cut into a round or square with a certain size (for example, a round with diameter of φ6 cm for JB-01/JB-02/JB-03 and a square with diameter of 8 cm×8 cm for JB-00), which is called a piece of test cloth. In order to ensure the consistency and comparability of test results, test cloths in Annex A may be uniformly produced and provided by relevant units.
Note: Uneven edges around each test cloth may be cut off. In order to avoid a large number of off-line during washing, test cloth that needs to be washed and test repeatedly shall be pre-hemmed with full cotton thread if necessary.
5.4 Reference detergent
Reference detergent formula and preparation method are listed in Annex B. Reference detergents are processed and produced with raw materials and technology of unified specifications, and customized uniformly when necessary. In use, it shall be prepared into the specified concentration according to the requirements of this standard or product standard.
Note: Differences in raw materials and processing techniques may cause inconsistent detergency effects of reference detergents.
5.5 Reference protease
Specification of reference protease: the reference protease should be produced with raw materials and technology of unified specifications, need to be with the same activity and specific warranty period. The technical requirements of the product are shown in the excellent product index of QB/T 1806-1993, and the enzyme activity shall be identified as necessary.
Preparation and use of reference protease solution: if the reference protease needs to be added in the detergency test of the sample, a certain amount of the protease shall be weighed (based on the identified enzyme activity, the added activity unit is converted into the use quality according to the product test requirements), and a small amount of water shall be added, then, stir and disintegrate under electromagnetic stirring for 10 min shall be done, and finally the volume shall be made to 100 mL with water. 1 mL of it shall be taken to the detergency bathtub containing with 1 L reference detergent solution, and the rest shall be discarded.
Foreword III
Introduction IV
1 Scope
2 Normative references
3 Terms and Definitions, Symbols and Codes
4 Test Principle
5 Reagents and Materials
6 Instruments and Equipment
7 Test Procedure
8 Result Calculation and Judgment
9 Test Report
Annex A (Normative) Types and Preparation of JB Series Test Cloth
Annex B (Normative) Types and Preparation Requirements of Reference Detergent
Annex C (Normative) Technical Parameters of Rinse Controller
Annex D (Informative) Q Value Inspection Method
Annex E (Normative) Inspection and Determination for Tested Rate of the Value of Detergency
Bibliography
