Rumors: [dry cleaning shady] washing and pretending to dry cleaning, toxic chemical products... Recently, after investigation, it was found that xxx and xxx two laundry clothes are almost all washed; professional laundry detergent is actually cheap detergent; dry cleaning agent is toxic The chemical product, tetrachloroethylene, is faded and dyed, and the cost per item is ten times that of washing.
Truth: Recently, a number of media have exposed the “shadow†of the laundry industry. The fraudulent behavior and reasonable price involved are beyond the scope of scientific discussion. However, it is worthwhile to justify the “dry cleaning agent to make clothes poisonousâ€. Discuss it.
What is dry cleaning?
Dry cleaning is a concept relative to washing. Most of our daily cleaning is done with water as a solvent, while dry cleaning uses organic solvents instead of water to clean the fabric.
If the stains on the fabric are classified according to their solubility, they can be roughly classified into two categories: fat-soluble and water-soluble. Most of the stains, especially those that are difficult to clean like blood, milk stains, oil stains, etc., are fat-soluble substances. They are not easy to combine with water. The conventional washing process is inferior in cleaning ability. It is easier to use a fat-soluble organic solvent to clean such substances. This is the same as the early years when the working people thought of using kerosene to clean the oil on clothes. reason.
Another benefit of using organic solvents is that they have less fiber damage to certain fabrics than water. In addition, organic solvents can kill more microorganisms during the cleaning process.
Is tetrachloroethylene a dry cleaning agent that should not be used?
Because of these characteristics of dry cleaning, when choosing which organic solvent (or combination of several chemicals) as a dry cleaning agent, the key indicators are the ability to dissolve fat-soluble substances, the damage of the dry cleaning agent to fibers and chromaticity, and its Sterilization ability. In addition, from a practical point of view, it is also necessary to see whether the dry cleaning agent can be removed from the clothes as easily as possible after the cleaning, and the cost, toxicity and the like of the dry cleaning agent.
Compared with petroleum hydrocarbon solvents such as kerosene and gasoline, tetrachloroethylene is indeed more toxic, but because it has obvious advantages in other aspects, it is still the dry cleaning agent used by most dry cleaners until now. Dry cleaning agent used.
Although it is permitted, the problem of toxicity is the most important concern for consumers.
How to make tetrachloroethylene safe
In fact, consumers don't need to worry about security. The dose of tetrachloroethylene exposed to clothing after dry cleaning is extremely limited, far enough to cause symptoms such as allergies, anesthesia, etc., and it does not cause liver toxicity, carcinogenicity and other poisons that require more doses for longer-term exposure. This can be understood from the dry cleaning steps.
Similar to daily washing, the dry cleaning of clothes is roughly divided into three steps: soaking the clothes in a solvent, making the stains in full contact with the solvent by rolling, and being carried away from the fabric (in the water wash, because most of the stains are insoluble in water, This process requires the aid of detergents; centrifugation removes the dry cleaning agent (because there is no need to add detergent, there is no step of rinsing in the water wash); heating further removes the dry cleaning agent on the fabric (the organic solvent is more volatile than water) This is easy to remove from the fabric, but the drying process will still raise the temperature to about 80 ° C, stay for 15 minutes to ensure that the dry cleaning agent is removed as much as possible.
If the consumer is still not comfortable with the clothing that has undergone such a harsh drying process, you can also dry the clothes that have just been retrieved from the dry cleaners for a day or two before entering the cabinet.
The amount of residual tetrachloroethylene on the fabric after dry cleaning is tested using the most sophisticated instrumental analysis method. The content is also very low. If it is left for a few more days, even if it is not ventilated, the residual tetrachloroethylene on the fabric will also be Basically unable to check out. It is also considered that the clothes sent for dry cleaning are usually not worn close to the body, and the possibility of contact is even less. Consumers don't need to worry about their own safety.
What really needs to be worried is actually the environment of the dry cleaners and the operators there.
Hybrid Fabric,Mixed Fabric,Hybrid Textiles,Carbon Kevlar Hybrid Fabric
Jiangyin Phecda New Material Technology Co., Ltd , https://www.phecdacomposite.com