What Is Formaldehyde Glue?

formaldehyde

(Chemical material)

Formaldehyde, colorless and irritating gas, chemical formula HCHO or CHO, molecular weight 30.00, also known as

Pure formaldehyde has a strong reducing effect, especially in alkaline solutions. Formaldehyde itself can proceed slowly

Formaldehyde has a wide range of uses and is a popular chemical product with simple production process and sufficient raw material supply. It is the backbone of the methanol downstream product tree. About 30% of the world's methanol is used to produce formaldehyde, with an annual output of about 25 million tons. Formaldehyde solution is a low-concentration aqueous solution, which is not convenient for long-distance transportation from the economic point of view, so generally set up factories near the main consumer market. Import and export trade is also very small. The industry mainly uses methanol oxidation and natural gas direct oxidation ^[4]

Formaldehyde, which causes harm to the human body in life, can be said to be everywhere. The items involved include furniture, wooden floors; children's clothing, non-iron shirts; fast-food noodles, rice noodles; blister squid, sea cucumber, beef louver, shrimp; and even cars. It is not difficult to see that clothing, food, housing, and transportation-the four most important things in our lives, formaldehyde is all dyed, and the ubiquitous formaldehyde is worrying.

Formaldehyde in textiles <br /> Formaldehyde is mainly used in fiber products as a dyeing aid and as a resin finishing agent to improve the anti-wrinkle and anti-shrinkage effects. Formaldehyde can make textiles bright and bright, maintain the durability of printing and dyeing, and can make cotton fabrics crease-proof, shrink-proof, and flame-retardant. Therefore, formaldehyde is widely used in the textile industry. Formaldehyde dyeing aids are mostly cotton textiles, commercially available "cotton anti-wrinkle" clothing or non-iron shirts, most of which use formaldehyde-containing additives, which may release formaldehyde when worn. Formaldehyde in children's clothing mainly comes from the bright and beautiful dyes and auxiliary products that maintain the color of children's clothing, as well as the adhesives used in clothing printing. Therefore, strong and printed clothing generally has a high formaldehyde content, while plain clothing and unprinted children's clothing have a lower formaldehyde content. These formaldehyde-containing clothing will release formaldehyde during storage and wearing, especially the formaldehyde released by children's clothing and underwear is the most harmful.
Formaldehyde in food

Formaldehyde is an additive banned from use in foods as stipulated by the state. It cannot be detected in foods, but the presence of formaldehyde has been detected in many foods to varying degrees. Radon is found in water-fat foods. Formaldehyde can keep the surface color of water-eating foods bright, can increase toughness and crispness, improve the taste, and can also preserve rot. If you use it to soak seafood, it can fix the shape of seafood and maintain the color of fish. Therefore, formaldehyde has been widely used by illegal traders to foam various aquatic products. The water-based foods that have detected formaldehyde in the market are: duck paw, beef louver, shrimp, sea cucumber, fish maw, catfish, octopus, cuttlefish, banded fish, squid head, hoof tendon, jellyfish, field snail meat, cuttlefish, etc. Shrimp, sea cucumber and squid are high in formaldehyde. Ravioli is found in pasta, mushrooms, or soy products. Formaldehyde can whiten and change color. Therefore, formaldehyde is often used by foul sellers to fumigate or directly add to pasta, mushrooms, or soy products. When illegal merchants use "hanging white blocks" to fumigate related foods, they can also remain in food. formaldehyde. Related foods that have been detected for formaldehyde include: shiitake mushrooms, shiitake mushrooms, rice noodles, vermicelli, yuba, etc.
Formaldehyde in indoor air

Formaldehyde in indoor air has become a major pollutant affecting human health,

Indoor air quality standards (implemented in GB / T 18883-2002 2003-03-01)

In order to protect human health, prevent and control indoor air pollution, this standard has been formulated. This standard specifies indoor air quality parameters and inspection methods. This standard applies to residential and office buildings. Other indoor environments can be implemented with reference to this standard. ^[6]

1. The problem of formaldehyde pollution is mainly concentrated in homes, textiles and food. Plywood, fiberboard, particleboard, etc. in room decoration materials and furniture

Formaldehyde ventilation method

Through the circulation of indoor air, the content of harmful substances in the indoor air can be reduced, thereby reducing the harm of such substances to the human body. In winter, people often close doors and windows, and indoor and outdoor air cannot circulate. Not only the formaldehyde content in indoor air will increase, but radon will continue to accumulate, even reaching high concentrations.

Advantages: good effect, no cost.

Disadvantages: It takes a long time, and it usually takes more than three years to remove formaldehyde.

Formaldehyde deodorization method

Formaldehyde deodorant can capture and decompose harmful pollutants such as formaldehyde, benzene and ammonia, kill harmful bacteria and harmful microorganisms of mites, purify the air, and eliminate odors ^[7] .

Misunderstanding of formaldehyde management

1.Remove formaldehyde with water, vinegar, and black tea

Many people on Amethyst said that because formaldehyde is soluble in water, you can put more water basins at home to absorb formaldehyde, or use vinegar or black tea to soak water. It is a fact that formaldehyde is easily soluble in water, alcohol and ether. Free formaldehyde in the air will dissolve into water when it encounters water during exercise, which is similar to the adsorption principle of activated carbon. The contact area of a basin of water and air is only the size of a basin, and the specific surface area of a gram of activated carbon can reach as large as a football field. Even if you put a hundred pots of water in the room, the adsorption effect will not be much stronger than a small bag of activated carbon. So using water, black tea, vinegar and other methods to adsorb formaldehyde is obviously unrealistic. The release of formaldehyde is closely related to the indoor temperature and humidity. As the temperature in the air increases, the amount of formaldehyde release will increase greatly. The experimental results show that when the relative humidity in the air increases by 10%, the indoor formaldehyde emission will increase by about 5%.

2.Purify the air with plants

During this process, the plants themselves will be injured, and many plants will be injured in severe environments with formaldehyde, and they may even die. Among them, safflower sorrel is particularly sensitive. As long as it is thrown in an environment with a formaldehyde concentration of 0.1 mg / m3 and left for 3 hours, 95% of the leaves will be injured (based on area ratio). And, as the formaldehyde concentration increases, the rate of injury is faster. They can only last for 3 hours in an environment with a formaldehyde concentration of 0.4 mg / m3, and then the entire leaf turns yellow-brown and loses water and wilts, becoming hay.

3.Adsorb formaldehyde with fruits such as oranges and pineapples

This is a method that many people like to use in the past, it can be said that it is a folk soil method. Many folk methods are a summary of long-term living experience and truths that have been tested over time and practice. But this method is completely ridiculous. CCTV's "Is it Real" column of the financial channel once broadcast a program that removes formaldehyde from grapefruit peels and pineapples? The experiment was performed deliberately in the program. The experimental results show that in the same sealed bin, the formaldehyde content of the experimental bin where the grapefruit peel is placed is ten times that of the blank bin. After the grapefruit husk was put in, the temperature of the experimental chamber increased, and the amount of formaldehyde released increased greatly. Grapefruit peel, pineapple, etc. not only cannot remove formaldehyde, but also increase the indoor formaldehyde content. In the past, the reason why many people think that after using grapefruit peels and pineapples, the interior decoration tastes less, because the taste of fruit masks the smell of formaldehyde. ^[8]