化工10ChemIntroduction

What is HIV? Human immunodeficiency virus 1 (HIV) is a virus that attacks the immune system by destroying CD4+ T cells (a type of white blood cell that fights infection). If HIV is not treated, it can develop into acquired immune deficiency syndrome (AIDS). HIV is transmitted through certain body fluids (blood, semen, pre-seminal fluid, rectal fluid, vaginal fluid and breast milk). What do HIV drugs do? The body is unable to clear the HIV virus and there is no effective treatment. However, with proper medical care, it can be controlled with HIV medicines. HIV medication prevents HIV from multiplying in the body and reduces the amount of virus in the body. The immune system can recover because there is less virus in the body. Although HIV remains in the body, the immune system is strong enough to fight off other infections. By reducing the amount of HIV in the body, HIV drugs can also reduce the risk of transmitting HIV to sexual partners. Treatment with HIV drugs is called antiretrovir

  Basic introduction: Waterproof mortar is made of cement mortar mixed with what kind of waterproofing agent. Common cement mortars with waterproofing agent include: chloride metal salt waterproofing agent cement mortar, inorganic aluminum salt  waterproofing agent cement mortar , metal soap salt waterproofing agent cement mortar, silicon waterproofing agent cement mortar, etc.     Advantages of waterproof mortar It can be constructed on the wet surface, which is difficult for general solvent waterproof and anticorrosive materials in China. Construction can be carried out in mixed concrete. Because the object has an impact on the construction base surface, the adhesion of the coating to the concrete is increased. At the same time, the cationic neoprene latex material fills the pores and fine cracks in the mortar, so that the coating has Good impermeability. The bonding force is 3 to 4 times higher than that of ordinary cement mortar, and the flexural strength is more than 3 times highe

  Methyl acetate , also known as MeOAc, acetic acid methyl ester or methyl ethanoate, is a carboxylate ester with the formula CH3COOCH3, is a clear, colorless liquid with a fruity, sweet smell. It is a versatile chemical that has a number of different uses. It is a flammable liquid with a characteristically pleasant smell reminiscent of some glues and nail polish removers. Methyl acetate is occasionally used as a solvent, being weakly polar and lipophilic, but its close relative ethyl acetate is a more common solvent being less toxic and less soluble in water. Methyl acetate has a solubility of 25% in water at room temperature. At elevated temperature its solubility in water is much higher.  Main Applications Solvent One of the most common uses of methyl acetate is as a solvent. It is a good solvent for many plastics, resins, and cellulose esters, and is often used as a replacement for other, more toxic solvents such as acetone and methyl ethyl ketone (MEK). Methyl acetate is also used