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Your location: Home > Related Articles > Car interiors are low-VOC, making the air in the car fresher.

Car interiors are low-VOC, making the air in the car fresher.

Author:QINSUN Released in:2023-09 Click:94

Car interiors are low in VOCs, making the air in the car fresher.

In the past two years, the odor inside new cars has been the most serious automobile quality problem reported by domestic consumers. In the same survey of American consumers, new car interior odors weren\'t even among the top 20 complaints. The ambient air inside the car depends to a large extent on the materials used inside the car as well as their bonding and fixing. Therefore, when selecting spare part suppliers, automobile manufacturers should focus on the low VOC performance of corresponding products.

Volatile organic compounds (VOCs) refer to organic compounds that can volatilize at room temperature, including alkanes, aromatic hydrocarbonsues, esters, aldehydes, etc. Textiles, leather, plastic parts, rubber, etc. Automotive interiors and adhesives used for bonding and securing can produce volatile organic compounds. As we all know, VOCs such as toluene, formaldehyde and other substances are present, which seriously harm human health. In the relatively closed environment of a car cabin, harmful gases that are difficult to emit will pose a greater threat to human health.

With this in mind, in early 2016, China revised the national standards for volatile organic compound (VOC) emission values ​​in cars to improve the common problem of odors in new cars. As one of the industry leaders in bonding solutions, tesa has developed a series of adhesive tape products that meet the revised national standards for organic compounds(VOC) based on its expertise and rich experience in the field of automotive interior bonding. this application.

The content of volatile substances in the passenger compartment of a car is an important factor affecting the internal environment of the car and driving visibility. In the process of production and functional improvement of automobile interior products, small molecular substances are likely to be introduced into them, and these introduced substances are volatile, especially when the internal temperature of the car is high, these substances are more volatile. Small molecular substances emitted from the car interior can float in the air, pollute the ambient air inside the car, endanger human health when inhaled, or condense on car windows. the car, negatively affect driving visibility and threaten driving safety. . Thereforent, how to test the content of volatile substances in automobile interior parts is a common concern in the automobile industry.

At present, the content of volatile substances in automobile interior parts is characterized by atomization performance and verified by atomization tests. It mainly includes three testing methods, gloss method, haze method and weighing method. , the first two focus on assessing the impact of volatile substances on driving visibility, while the second focuses on testing the content of volatile substances in the sample. Among the three methods, the weighing method and the gloss method are widely used.

Standards that can be referred to for atomization testing include QB/T 2728-2005 “Determination of atomization performance of physical and mechanical tests of leather” and DIN 75201-1992 “Determination of atomization performance of automobile interior materials”. \", BS EN 14288-2003 \"Leather - Physical and mechanical tests - Determination of fogging properties\", etc.

Principle of the test:

The test consists of accelerating the volatilization of small molecular substances in automobile interior parts by increasing the temperature to shorten the volatilization time.During the test, the sample is placed in the misting cup and an aluminum foil or glass plate is placed on the -above the misting cup. The misting cup is placed in the heating tank of the misting tester for heating, and the aluminum foil or glass plate above passes through the cooling device. Leave cool. The volatilized gas in the sample will condense on the surface of the coolerd aluminum foil or glass plate. By testing thes optical properties of the glass plate or the weight change of the aluminum foil before and after condensation, the atomization performance of the sample can be obtained.

Testing process:

(1) Turn on the atomization tester and adjust the temperature parameters to control the temperature of the high temperature tank at 100°C.

(2) Cut 3 specimens with a diameter of 80 mm from the specimen surface and place them in a desiccator to dry for at least 2 days under environmental conditions of 23 ± 2℃.

(3) Clean the misting cup thoroughly and dry it completely.

  (4) Accurately weigh the weight of the aluminum foil and record it.

(5) Place the samples in three nebulizer cups respectively, take another nebulizer cup and add 10 ± 0.1 g of dioct phthalate standard materialyle (DOP) as a control. To test, place a sealing ring. , weighed aluminum foil, glass and filter paper on the top of the misting cup.

(6) Place the misting cup into the high temperature tank of the atomization tester which has been at constant temperature at 100°C. Place the cooling plate on the filter paper. The cooling water temperature is 21°C. Heating for 16 hours.

(7) Remove the aluminum foil, place it in a desiccator with the atomized side up, dry it for 3.5-4 hours and weigh it accurately. The difference in weight of the aluminum foil before and after the test corresponds to the atomization value of the sample.

Through the atomization test, the control of volatile substances can be achieved to effectively reduce environmental pollution in the car. It has become an important means for auto manufacturersbiles to control the quality of their products. At present, there are many international and national testing standards for atomization performance, involving three main testing methods: gloss method, gravimetric method and mist method.

Germany DIN 75201 Determination of haze properties of materials used in automobile interior equipment (gloss method, gravimetric method)

United States SAE J1756 Test for determine haze properties of automobile interior parts Methods (gloss method, gravimetric method)

China QB/T 2728 Determination of atomization properties of leather for physical and mechanical testing (gloss method , gravimetric method)

Volkswagen PV3920 Interior parts non-metallic materialsDetermination of the haze value of materials (haze method)

Mitsubishi ES-X83231 Formatting propertiesn of mist of interior materials (mist method, gravimetric method)

International ISO 6452 Rubber or Determination of atomization characteristics of plastic coated fabrics automobile interior decoration materials (gloss method, gravimetric method )

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