New Standard For Microfiber Leather Industry

From October 1, 2010, the general standard of safety technology for polyurethane microfiber synthetic leather, QB/T 4046-2010, will be implemented by the Ministry of industry and information technology, approved by Shandong new island Limited by Share Ltd.

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Shandong Tonghai island new material Limited by Share Ltd is the most advanced technology enterprise with the strongest technical strength, the largest variety of products and the largest market share in China.

In September 2006, we held a task meeting on the "general safety and technical conditions of polyurethane superfine fiber synthetic leather" at Tongdao Island company. We made preliminary arrangements for the plan, progress and division of labor for the standard drafting work, and set up a working group for drafting standards.

The group is made up of Tongdao Island company and Weifang product quality supervision and Inspection Institute.

The standard drafting group has consulted a large number of domestic and foreign information about relevant products, and selected samples of various specifications and uses for production level to be tested and verified in Tongdao Island company and Weifang product quality supervision and Inspection Institute. On this basis, the draft standard has been completed.

In December 2006, the standard drafting group sent the draft standard draft (standard draft) to the relevant units for comments and final completion of the standard.

In April 22, 2010, the Ministry of industry and information technology formally approved the standard.

The release and implementation of the standard solved the standard technical bottlenecks in the development of industry standards, and broke the monopoly of foreign technology and trade barriers, which is conducive to standardizing the production and process control of enterprises, and improving the quality, competitiveness and standardized management level of products.

This standard mainly stipulated the safety grade, safety technology condition and test method of polyurethane superfine fiber synthetic leather.

Polyurethane superfine fiber synthetic leather products are classified into three categories according to their safety level.

The standard proposes 11 safety technical conditions and experimental methods:

1. pH value: pH value is determined by GB/T7573.

A sample of 2 + 0.05g was selected, and three samples were cut into 1cm * 1cm sample. 100ml distilled water or deionized water were added to the oscillating machine for 1 hours. The average value of pH measured by second and third aqueous extracts was taken as the final result, and the result was accurate to 0.05.

2. formaldehyde content: formaldehyde content is carried out according to GB/T2912.1.

It is used to simulate the quantitative determination of formaldehyde released from fabric during the wearing process.

After accurate weighing of the sample, the water was extracted at 40 degree water bath for a period of time. The formaldehyde extracted from the fabric was absorbed by water, then the extract was coloured with acetylacetone, and the color of the solution was determined by spectrophotometer colorimetry.

3. extractable heavy metals: extractable heavy metals are executed according to GB/T17593, and heavy metals are extracted by artificial acid sweat, of which six valent chromium is executed according to SN 0704.

The heavy metals used in the standard are antimony, arsenic, lead, cadmium, chromium, chromium (six valence), cobalt, copper, nickel and mercury. Once absorbed by heavy metals, these heavy metals will be toxic to the skin, liver, kidney, heart, brain, skeleton, nervous system and endocrine system, and will cause great harm to human health.

Especially for infants, the absorption capacity of heavy metals is greater than that of adults.

4. decomposable aromatic amine dyes: decomposable aromatic amine dyes (azo dyes) are executed according to GB/T19942, and carcinogenic dyes are executed according to GB/T20382, and sensitized dyes are carried out according to GB/T20383.

Azo dyes are dyes that contain at least one azo group in the chemical structure.

When textiles are banned from azo dyes, dyes can be absorbed by the skin and spread in the human body in long-term contact with the human body.

These dyes can be reduced to produce carcinogenic aromatic amines under the biochemical reaction of normal metabolism of human body. After a series of activation, the DNA structure and function of human cells are changed, causing human diseases or inducing carcinogenesis.

Carcinogenic dyes are dyes that can induce cancer in human body without chemical changes such as reduction.

Sensitizing dye means that some dyestuffs are easy to swim and remove fibers after dyeing, causing skin damage and causing skin allergy.

5. water fastness: water fastness is performed according to GB/T5713.

The textile samples are bonded together with one or two specified adhesive fabrics, immersed in water, squeezed out of water, and placed in the middle of the two plates of the test device to withstand the prescribed pressure.

Dry sample and lining fabric are evaluated with grey card to evaluate the color change of the sample and the stain of the lining fabric.

6. color fastness to acid and alkali perspiration: color fastness to acid and alkali perspiration is performed according to GB/T3922.

The textile samples were bonded together with one or two specified adhesive fabrics and placed in acid and alkaline simulated sweat respectively. The test solution was removed and placed in the middle of the two plates of the test device to withstand the prescribed pressure.

Dry sample and lining fabric are evaluated with grey card to evaluate the color change of the sample and the stain of the lining fabric.

7. color fastness to dry and wet rubbing: color fastness to dry and wet rubbing is carried out according to GB/T3920.

The samples were respectively rubbed with dry and wet rubbing cloth and evaluated with grey card.

8. color fastness to saliva: saliva color fastness is performed according to GB/T18886.

The textile samples were put together with one or two specified adhesive fabrics and placed in artificial saliva. The test solution was removed and placed in the middle of the two plates of the test device to withstand the prescribed pressure.

Dry sample and lining fabric are evaluated with grey card to evaluate the color change of the sample and the stain of the lining fabric.

9. the determination of abnormal odor: put the sample in a clean and unscent test environment, so that trained professionals can judge the smell. The test should be completed within 24 hours after the sample is obtained.

10. determination of Flame Retardants: the purpose of flame retardant finishing is to protect the safety of human body, but some flame retardants are harmful to human body, such as PBB, TRIS, TEPA and so on. SN/T 1851-2006 can be used to detect the use of flame retardants to determine whether the use of flame retardants meets the requirements of standards.

11. determination of harmful surfactants (APEO): samples were extracted by Soxhlet extractor, concentrated and determined by gas chromatography-mass spectrometry. External standard method was used to quantify the retention time and characteristic ions of samples and standard samples.