SN/T 5230-2019Test method for weather resistance of automobile leather interior (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

Please note that certain contents of this document may involve patents. Publication of this document the agency is not responsible for identifying these patents.

This standard was proposed and managed by the General Administration of Customs of the People's Republic of China.

Drafting organizations of this standard. Chengdu Customs of the People's Republic of China, Fuzhou Customs of the People's Republic of China, Natural Environment of Turpan, Xinjiang Experimental Research Center, Tianjin Customs of the People's Republic of China, Sichuan University.

1 Scope

This standard specifies the method of exposure test to fluorescent ultraviolet light source for leather, artificial leather and synthetic leather used in automotive interiors and before and after aging Determination of changes in performance.

This standard is applicable to weather resistance testing of various automotive interior leather, artificial leather and synthetic leather.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 250 Gray Sample Card for Textile Color Fastness Test to Evaluate Discoloration QB/T 2710 Determination of tensile strength and elongation of leather physical and mechanical test

3 Terms and definitions

The following terms and definitions apply to this document.

Fluorescent UV lamp

Fluorescent lamps that generate no less than 80% of the total light energy output in the ultraviolet region of the spectrum (such as below 400 nm).

Irradiance

The radiant flux per unit area of the specified wavelength range, in watts per square meter (W/m2).

Radiant energy

The time integral of irradiance in Joules per square meter (J/m2).

Spectral energy distribution the absolute or relative radiant energy emitted by a light source or received by an object is a function of wavelength.

Weather resistance

The material is exposed to certain climatic conditions (such as sunlight, rain, humidity, temperature and other factors), and its ability to resist performance deterioration.

4 Principle

The samples are subjected to a laboratory fluorescent UV lamp exposure test under controlled environmental conditions to compare the performance of the exposed samples with the original samples Variety.

5 Apparatus and equipment

6 Sample preparation

The number and size of the samples should meet the requirements in the post-exposure performance test method. Sampling should be at least 5 cm from the edge of the sample.

Note. Due to the performance of the test sample after exposure, a large standard deviation will be generated. In order to avoid unforeseen circumstances (such as testing the force after exposure) when learning performance, the sample is prematurely broken or damaged, etc.), the recommended number of samples is twice the number specified in the relevant performance test method standards.

7 Test conditions

7.1 The ambient temperature of the test room should be within the range of 20 °C to 30 °C.

7.2 Environmental test conditions. use fluorescent ultraviolet lamp at 340 nm with an irradiance of 0.89 W/m2 and the temperature of the blackboard is 70 °C Expose for 8 hours, and then condense at a blackboard temperature of 50 °C for 4 hours, which is a cycle. According to the characteristics of the sample and the final use environment, select Choose the appropriate number of cycles.

8 Test procedure

8.1 Install the sample on the sample holder so that the exposure surface of the sample faces the light source and ensure that the surface of the sample is flat.

8.2 To ensure consistent cycle conditions, the exposure area should be filled with samples. When the sample is not full, a blank sample holder should be used.

8.3 Before placing the sample in the test box, the test equipment should be adjusted and set up to meet the required test conditions and then the test should be started. The test should be kept in the whole Continue to run within a cycle.

8.4 During the sample exposure process, the irradiance should be monitored regularly to ensure that the sample is evenly exposed.

8.5 When necessary, conduct regular inspections on the samples during the cycle, and take out the samples after the cycle is over.

9 Performance measurement

9.1 Before the performance test, the sample should be kept in a dry state.

9.2 Determine the strength of the original sample and the sample after the cycle in accordance with QB/T 2710 related performance test method standards, and calculate the relevant strength retention rate.

9.3 Use a gray sample card conforming to GB/T 250 to evaluate the color change of the sample after the cycle.

9.4 Other performance changes before and after the cycle, such as appearance changes, can be measured and compared according to needs or agreement between the supplier and the buyer.

10 Test results

10.1 Calculate the strength retention rate according to formula (1), and keep the result to one decimal place.

Where.

R-strong hold, %;

F-the maximum force value after the sample is cycled, the unit is Newton (N);

F0-the maximum force value before the sample cycle, the unit is Newton (N).

10.2 Other performance changes shall be implemented in accordance with the relevant performance test method standards.

11 Test report

The test report should include the following.

a) Indicate the number of this standard;

b) Environmental test conditions and total test time (number of cycles);

c) Periodic inspection records of cycle test date and cycle period (sample, equipment);

d) Performance test method standards and test results;

e) Deviate from the description of this method standard.