Crystal infiltration waterproof coating (Crystal infiltration activity of parent material) is an active substance with a molecular structure of active silicon. It has a small molecular weight and contains both hydrophobic groups and hydrophilic groups. It is more hydrophilic than hydrophobic, soluble in water, and will not undergo polycondensation crystallization in a dry environment, but will occur in a humid environment. It is made of active silicon, cement, active inorganic mixture, etc. Chinese name: Crystal infiltration activity of parent material. Foreign name: Crystal infiltration activity of parent material. Applied disciplines: water conservancy, science and technology, engineering mechanics and other executive standards. GB18445-2001 National standard science and technology term: infiltration crystal waterproof coating. Definition: It is developed by high technology from active silicon, cement, active inorganic mixtures, etc. The waterproof coating with self-repairing waterproofing definition is specially used as the core raw material of cement-based penetrating crystallized waterproof coating. Crystal formation 1) Crystal formation process Penetration crystal waterproof coating is an active material with a molecular structure of (Ca(O-R-OH)2), a small molecular weight, and contains both hydrophobic groups (-R-) and hydrophilic groups ( -OH), its hydrophilicity is greater than hydrophobicity, and it is soluble in water. In a dry environment, polycondensation crystallization does not occur, but in a humid environment, polycondensation crystallization occurs, forming a water-insoluble crystal [(-O-R-)( -2n] reaction formula is as follows: nCa(O-R-OH)2+nCa(O-R-OH)2—→ 2(-O-R-)2n+2nCa(OH)2 Ca(OH)2+CO2—→ CaCO3+ H2O It can be seen that as n increases, the molecular weight of the crystal [(-O-R-)?2n] increases, the hydrophilic group decreases, the hydrophobicity is greater than the hydrophilicity, and it is insoluble in water. The test shows that the active substance powder is pungent and its pH value is ≥12. The active substance powder has good stability in a dry alkaline (PH value>7) environment and does not undergo polycondensation reaction. Formation conditions The concentration of the aqueous solution of active substances increases and polycondensation crystallization occurs. The active substances of the crystallized active masterbatch are dissolved in water during the hydration process of cement or when construction on the wet surface of wet cement products, and are dispersed in the cement products with the water. However, as time goes by, the alkalinity decreases (that is, the pH value decreases) and polycondensation crystallization occurs. During the coating construction process, the active substance micro-solution absorbs CO2 in the air and acidity in the surrounding environment 3) The formation speed of crystals penetrates crystalline waterproofing The crystallization process of materials is a complex chemical process, so there is a problem of how fast the reaction speed is. For materials with fast crystallization speed 4) The stability of crystals The stability of crystals is determined by the degree of polymerization n. When the alkalinity of the active substance solution environment decreases, the acidity increases (that is, the pH value decreases