Misunderstanding of washing powder: washing powder that is clean without soaking

In the supermarket, there are more than ten kinds of washing powder shelves in various colors. If you look carefully at the prices, you can find cheap ones of six or seven yuan and expensive ones of more than 20 yuan. I believe that most people choose washing powder based on life experience or advertisements. Some people think that you get what you pay for, and some people just look for cheap ones. How much does the poor money have to do with the effect? We asked the experts in the industry to introduce it. The effect of washing powder is similar. In the first scene of the advertisement, the child soiled the clothes; Can it really achieve such an effect? The staff bought washing powder at 9 yuan, 11.2 yuan, and 16.09 yuan per kilogram, took 1 scoop of each and poured it into three water basins, then dripped ink on 3 white towels, soaked the towels in the washing powder water and rubbed them 15 strokes. It turned out that the washing powders at these three prices have similar washing effects, so there is really no washing powder that can be taken out after soaking it in the advertisement, and it will be very clean. Does the more expensive laundry detergent have poorer detergency? The most important raw material in washing powder is called surfactant, which is the key substance for decontamination. In theory, the more expensive the detergent, the higher the surfactant content, but in reality, this is not entirely the case. The washing powder at three prices was taken to the Beijing Washing Products Quality Monitoring Station for testing. After weighing, suction filtration, evaporation in a water bath, high temperature baking (105°C), cooling at room temperature, and finally through color titration, the test results are as follows: The surfactant content of 9 yuan washing powder is 20.5, the surfactant content of 11.2 yuan washing powder is 17.1, and the surfactant content of 16.09 yuan washing powder is 14.3. The test results show that the more expensive laundry detergent has lower surfactant content, what is going on? Teacher Ji said: 'Expensive laundry detergent may be compounded and contains a variety of surfactants, but only one can be detected. Expensive laundry detergent contains not only surfactants, but also many additives and additives. , There are more ingredients in the washing powder, and the price will naturally be more expensive.' But it cannot be understood that the washing effect of expensive washing powder is not good. The reasonable price of washing powder is about 10 yuan per kilogram. According to Mr. Ji, the country has standards for the formula of washing powder, and everyone makes reference to this standard, so the price will not vary too much. For the same weight of washing powder, it is normal for the price to fluctuate by 20%, and the washing effect is similar. Now the more reasonable price of 1 kg of washing powder should be about 10 yuan. Therefore, washing powder of 12 yuan or 8 yuan per kilogram will do. Does cheap washing powder hurt your hands? Take the washing powder at three prices to the laboratory to test the pH value. The pH value test is based on the content of alkaline substances in the washing powder. Whether it hurts your hands or not depends on the alkalinity of the washing powder. The pH value of 9 yuan laundry detergent is 10.6, 11.2 yuan is 10.7, and 16.09 yuan is 10.8. So it's not that cheap washing powder hurts your hands. It can be said that allergy to washing powder is a matter of individual differences, and has nothing to do with washing powder itself. Laundry powder contains alkali, and it should be said that it is a normal phenomenon that the hands and hands feel dry and astringent after washing the clothes. It is recommended to wear rubber gloves when washing clothes. Multi-foaming and low-foaming laundry detergent has the same washing effect Teacher Ji also pointed out that the fragrance of laundry detergent has no effect on the human body. The discomfort caused by the fragrance of washing powder is a matter of individual physical differences, and has nothing to do with the washing powder itself. In addition, the red, green and green dots in the washing powder are just an additive and have no substantial effect. The foamy and low-foaming detergents have the same washing effect.
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