QB/T 4671-2014 Test method for synthetic leather/artificial leather - Resistance to hydrolysis
1 Scope
This standard specifies the test methods for determining the resistance to hydrolysis of synthetic leather/artificial leather, including the hydrolysis resistance method at constant temperature and humidity (method A), the alkali accelerated method at normal temperature (method B) and the alkali accelerated method at high temperature (method C).
This standard is applicable to the resistance-to-hydrolysis test of polyurethane artificial leather and polyurethane synthetic leather.
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 referenced document (including any amendments) applies.
GB/T 629-1997 Chemical reagent - Sodium hydroxide
GB/T 2918-1998 Plastics - Standard atmospheres for conditioning and testing
GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods
GB/T 8949-2008 Polyurethane dry-processing artificial leather
QB/T 2714-2005 Leather - Physical and mechanical tests - Determination of flex resistance
3 Principle
The resistance to hydrolysis of the sample is evaluated by the change in the surface state and the change in the mechanical properties of the sample in the environment with a certain temperature and humidity or with a certain temperature and a certain concentration of lye solution for a specified time.
4 Test equipment and materials
4.1 Test equipment
4.1.1 Constant temperature and humidity tester
The parameters shall meet the following requirements:
——Temperature: 0°C to 100°C; with an accuracy of ±0.5°C;
——Humidity: 30%RH to 95%RH; with an accuracy of ±3%RH.
4.1.2 Oven
Temperature: 0°C to 200°C; with an accuracy of ±1°C.
4.2 Test materials
4.2.1 NaOH with analytical reagent grade
It shall meet the requirements of GB/T 629-1997.
4.2.2 Distilled water
It shall be Grade 3 as specified in GB/T 6682-2008.
4.2.3 Container with lids and resistant to 100°C
The container shall not react with NaOH solution.
4.2.4 Container without lids and resistant to 100°C
Beaker, weighing paper, measuring cylinder, glass rod.
5 Specimen preparation
Foreword i
1 Scope
2 Normative references
3 Principle
4 Test equipment and materials
5 Specimen preparation
6 Test procedures
7 Test report
