Camphor moth repellant
Camphor moth repellent is based on synthetic camphor or natural camphor as the basic raw material, and a certain proportion of functional additives such as pigments, essences or spices are added when necessary. , deworming, antiseptic, incense and other camphor products. Camphor is a colorless or white crystal, translucent block or powder, flammable, has a strong camphor wood and spicy taste, can be slowly volatilized at room temperature, and its vapor can kill insects, sparrows and other birds. Camphor has been used for nearly a hundred years as a moth repellant for clothing and books. Natural camphor exists in the camphor tree, the raw material is steam distilled to obtain camphor oil, and then fractionated under reduced pressure to obtain camphor, which is purified by sublimation to obtain refined camphor. Due to the scarcity of raw materials, the production of natural camphor is limited. Natural camphor is optically active (rotates the vibration plane of polarized light), while synthetic camphor is not optically active. Synthesis of camphor consists of a series of chemical reactions such as isomerization of pinene in turpentine, addition and esterification of camphene followed by saponification (or direct hydration of camphene), dehydrogenation of isoborneol, and a series of rectification, crystallization and sublimation. A product obtained during a chemical unit operation. It is a white powder crystal, without optical activity, with aromatic smell and cool feeling. Daily camphor refers to synthetic camphor or natural camphor as the basic raw material, if necessary, a certain proportion of functional additives such as pigments, essences or spices can be added, and then through the process of stamping and forming, it has various shapes and sizes. , mainly used for moth-proof, insect-repellent, anti-corrosion, incense and other camphor products for clothes, fabrics, books, archives, paper, wood and other items.
Camphor is not suitable for chemical fiber clothing. In light cases, the fibers will swell, the fastness will be reduced, and in heavy cases, the fabric will be melted. Especially acrylic fabrics melt faster. Holes can appear after camphor has been in contact with acrylic clothing for a few hours. In addition, mothballs placed on silk fabrics will also cause yellowing, and the anti-moth effect is poor. Camphor is volatile at room temperature, and heating can accelerate volatilization. Camphor has poor anti-moth effect and is easy to deliquescence. Excessive inhalation of camphor vapor can cause acute poisoning with neurological symptoms. On March 23, 1999, the State Environmental Protection Administration approved, issued and implemented the technical requirements for environmental labeling products of safe insect repellents. p-dichlorobenzene.
Moth repellent with naphthalene as the main raw material
Naphthalene is a product derived from petroleum or coal tar mixed with naphthol derivatives. Naphthalene has a strong camphor odor, is easily volatile and sublimated, can be ignited, and has a lot of smoke in weak light. Its vapor has an anesthetic effect, and the maximum allowable concentration is 10mg/cm. Naphthalene is mildly irritating to the skin and is produced by high temperature fractionation of coal tar. The repellent effect is better than camphor. Both naphthalene and naphthol are highly toxic. In mild cases, they can irritate human skin, or cause headache, nausea, loss of appetite and other reactions; in severe cases, they can cause kidney damage and hemolytic anemia, especially those with inherited erythrocyte enzyme defects. Sick children are more prone to hemolytic anemia. Naphthalene is listed as a possible human carcinogen by the World Health Organization and the International Center for Research on Cancer, and regular exposure to naphthalene has a certain risk of cancer. As early as 1992, the State Administration for Industry and Commerce has clearly banned the use of naphthalene pills as mothballs, but sanitary balls and mothballs produced with naphthalene as raw materials can still be seen on the market. The naphthalene pill of the sanitary ball, commonly known as the stinky pill, is an effective moth-proof and mildew-proof agent. Since it has been proven to cause cancer, as early as 1993, my country has explicitly banned the production, sale and use of it. But there are still "mothballs" made of refined naphthalene on the market
Moth repellent with p-dichlorobenzene as main raw material
In the late 1940s, foreign countries began to conduct a large number of experimental studies on "para-dichlorobenzene", which was believed to be toxic to the liver and kidneys, as well as to the thyroid gland. Large doses have certain carcinogenicity to animals and are harmful to humans. are suspected carcinogens. Since the International Agency for Research on Cancer listed p-dichlorobenzene as a possible human carcinogen, there are almost no moth repellants using p-dichlorobenzene as raw materials in the markets of developed countries such as Europe, America and Japan. Para-dichlorobenzene is made by chlorination of benzene, with low melting point, fast sublimation, strong odor, and better anti-moth effect than camphor and tea. Besides being used as moth repellant, it can also be used as air deodorant with a maximum allowable concentration of 75 mg/cm, and has an anti-mildew effect. Its density is high, and it is easy to identify with camphor. The source of p-dichlorobenzene is abundant, and the industrial product is usually 100% crystalline. The acute toxicity is close to the slightly toxic level, but it has an inhibitory effect on the central nervous system of animals. It is irritating to eyes and upper respiratory tract, but non-irritating to skin. It is a moth-proof drug popularized in China after the ban on naphthalene pills. The United States has used it to replace the possible carcinogen "refined naphthalene" since the 1970s. Paradichlorobenzene has been used in industry and consumer products in the United States for at least 70 years, and in addition to its full approval as an industrial space deodorant, paradichlorobenzene is a lot of it due to its ability to prevent borers from damaging fibers.
The main component of moth-proof ball and moth-proof sheet products. In Canada, paradichlorobenzene is used as an air freshener, urinal deodorizer and moth repellant. In 2005, the State Environmental Protection Administration re-revised the standards for insect repellents issued in 1999, and the new "Technical Requirements for Environmental Labeling Products Safety Insect Repellents" once again clarified that insect repellants "should not use naphthalene and naphthalene in the production process of products. p-dichlorobenzene". However, "Technical Requirements for Environmental Labeling Products Safe Moth Moth Repellents" is a recommended standard and is applicable to China's environmental labeling product certification. Therefore, "paradichlorobenzene" is a sanitary insecticide and can be used in mothballs. However, the word "low toxicity" should be marked on the conspicuous position of the product packaging
