The quality supervision and spot checks of rubber products recently announced by the Quality Supervision Bureau of Gansu Province showed that the sampling inspection rate of products was 70%.
This time spotted 40 batches of products from 34 companies. The main product categories involved were rubber sheets for industrial use, general V-belts for general transmission, tires for electric vehicles, inner tubes for electric vehicles, and rubber hoses for general water transport fabrics. Products.
The results showed that 28 batches of products from 22 companies were qualified, the qualification rate of the company was 64.7%, and the sampling inspection pass rate was 70%. The overall quality levels of the three products of Lifan tires, inner tubes for power trains, and ordinary V-belts were used. Stability, high pass rate, and poor quality of general-purpose water delivery fabric reinforced rubber hoses.
The main quality problems discovered by the spot inspection were: the tensile strength of the rubber hose, the inner and outer adhesive layers, the elongation at break, the inner and outer adhesive layers, the heat aging properties, the rate of change in tensile strength, the inner and outer layers, The thermal aging performance, the rate of change in the elongation at break, the internal and external adhesive layers are unqualified, and the indicators such as tensile strength, thickness deviation, and elongation at break of industrial rubber sheets are unqualified; The adhesive strength of the rope is not qualified.
Many industries have begun to use optical brighteners, such as paper, plastics, leather, and detergents. At the same time, fluorescent whitening agents are also used in many high-tech fields, such as fluorescence detection, dye lasers, anti-counterfeiting printing, etc., and even high-sensitivity films for high-altitude photography. In order to improve the sensitivity of photosensitive latexes, fluorescence is also used. Brightener.
In China, optical brighteners were first classified as printing and dyeing auxiliary products, and then classified as dye products. Due to its unique properties and large amount of demand, it has been separated from the above two industries and has become a separate class of fine chemical products. The first largest user of domestic fluorescent whitening agents is detergents, the second largest user is paper, and textiles are the third largest user.
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