What is the practical significance of the hydrophilicity and hydrophobicity of building materials in

1. The hydrophilicity of building materials can help other materials enhance the fusion of water in construction projects, for example, there is a kind of superplasticizer in the additives of concrete, which can help enhance the workability of concrete, reduce water, and configure concrete of the same strength to reduce the amount of cement.

2. Similarly, the hydrophobicity of the material can also play an important role in construction projects by taking advantage of its hydrophobic properties. For example, water-repellent materials such as asphalt are commonly used in waterproofing materials.

When a material comes into contact with water, some materials can be wetted by water, while others cannot be wetted by water, the former is hydrophilic and the latter is hydrophobic. To further illustrate the hydrophilic and hydrophobic properties of the material, let's talk about the concept of wetting angle.

At the intersection of liquid, solid and gas of water, material and air, the tangent line of the surface of the droplet is made, and the angle between the tangent line and the surface of the material is called the wetting angle of the material. If the wetting angle is 90 degrees, it means that the force between the material and the water is greater than the force between the water, so the material can be wetted by water, and the material is said to be hydrophilic. On the contrary, if the wetting angle is 90 degrees, it means that the force between the material and the water is less than the force between the water, so the material can not be wetted by water, and the material is said to be hydrophobic.

Water can be spread on the surface of hydrophilic materials, and water can be automatically sucked into the material through capillary action, water can not be spread on the surface of hydrophobic materials, and water does not penetrate into the capillary of the material.

Most of the building materials are hydrophilic materials, such as cement, concrete, sand, stone, brick, wood, etc., and only a few materials such as asphalt, paraffin and some plastics are hydrophobic materials.

So what are the uses of hydrophilic and hydrophobic materials? Hydrophilic materials can be used in more designs that need to be bonded, which can make buildings more stable; Hydrophobic materials are often used as moisture-proof, waterproof and anti-corrosion materials, and hydrophilic materials can also be surface treated to reduce their water absorption.

First, the nature is different.

1. Hydrophilic materials: The properties of materials that can be wetted by water when they are in contact with water are called hydrophilic materials.

2. Hydrophobic materials: the property that the material cannot be wetted by water when it is in contact with water, and when the wetting angle of the material is greater than 90, it is called a hydrophobic material.

Second, the characteristics are different.

1. Hydrophilic materials: molecules with polar groups have a large affinity for water, which can attract water molecules or dissolve in water. These molecules form a solid material surface that is easily wetted by water.

2. Hydrophobic materials: In the composite insulator industry, hydrophobicity is also known as wettability, which is determined by the surface tension of the outer insulation (silicone rubber) of the composite insulator, and characterizes the wetting ability of moisture to the outer insulation of the composite insulator.

Third, the judgment method is different.

1. Hydrophilic material: When the wetting angle is less than or equal to 90°, the cohesion between the moisture is less than the mutual attraction between the water molecules and the molecules on the surface of the material, which is a hydrophilic material.

2. Hydrophobic materials: When the wetting angle is greater than or equal to 90°, the cohesion between the water molecules and the molecules on the surface of the material is greater than the mutual attraction between the water molecules and the molecules on the surface of the material, which is a hydrophobic material.

The material is easy to combine with water, reacts after drying, and the material that has a waterproof effect is a hydrophilic material; The material does not tolerate water, and the material that can have a water-repelling effect is a water-repellent material.

It is usually divided by the size of the wetting angle. The wetting angle is the angle formed by the tangent line of the water droplet surface and the contact surface of water and solid at the intersection of material, water and air. The smaller the wetting angle, the easier it is for the material to be wetted by water.

When the wetting angle of the material is 90", it is a hydrophilic material; When the wetting angle of the material is 0 90', it is a hydrophobic material. Water can be spread on the surface of hydrophilic materials, and water can be automatically sucked into the material through capillary action; Not only can water not spread on the surface of hydrophobic materials, but also water cannot penetrate into the capillaries of the material.

Principle of hydrophilicity.

The property that is easy to bond with water into hydrogen bonds is called hydrophilicity. Many hydrophilic groups, such as hydroxyl groups, carboxyl groups, amino groups, sulfonic acid groups, etc., are easily combined with hydrogen bonds, so they are hydrophilic.

Hydrophilicity: The property of wetting the surface of a material with moisture. It is an interfacial phenomenon, and the essence of the wetting process is the change of properties and energy of the material interface. When the cohesion between water molecules is less than the mutual attraction between water molecules and solid material molecules, the material is wetted by water, and this material is hydrophilic, which is called hydrophilic material; When the cohesion between water molecules is greater than the attraction between water molecules and material molecules, the surface of the material cannot be wetted by water, and this material is hydrophobic (or hydrophobic), which is called hydrophobic material.

If the wetting angle of the material is less than 90 degrees, it is a hydrophilic material, and if it is greater than that, it is hydrophobic.

Definition of hydrophilicity.

hydrophilic property; Hydrophilicity is a molecule with a polar group that has a large affinity for water and can attract water molecules, or dissolve in water. These molecules form a solid material surface that is easily wetted by water. Having this property is the hydrophilicity of the substance.

Hydrophilicity refers to the physical property of a molecule that forms a transient bond with water through hydrogen bonds. Because it is thermodynamically suitable, this molecule can be dissolved not only in water, but also in other polar solutions. A hydrophilic molecule, or hydrophilic part of a molecule, is the ability to polarize to the point where hydrogen bonds can be formed and make it easier to dissolve in water in oil or other hydrophobic solutions.

Hydrophilic and hydrophobic molecules can also be referred to as polar and non-polar molecules, respectively. Soap has both hydrophilic and hydrophobic ends, allowing it to dissolve in water as well as in oil. As a result, soap removes the interface between water and oil.

The material has the property of affinity for water. Sheet metal such as chromium, aluminum, zinc and the hydroxides they produce as well as substances with capillary phenomena have a good hydrophilic effect.

Hydrophilic spine deficiency material refers to a material that can be moistened by water when in contact with water. Whereas, hydrophobic materials refer to materials with a wetting angle greater than 90.

1. Hydrophilic materials.

Hydrophilic material molecules have polar groups that have a great affinity for water and can attract water molecules.

Or dissolve in the high water infiltration. The surface of the solid material formed by these molecules is easily wetted by water.

2. Water-repellent materials.

In the composite insulator industry, hydrophobicity, also known as wettability, is made up of composite insulators (silicone rubber.

Outer insulating surface tension.

Decision, which indicates the wettability of water to the outer insulation of the composite insulator.

First, the nature is different.

1. Hydrophilicity.

Material: The property of a material that can be wetted by water when it comes into contact with water is called a hydrophilic material.

2. Hydrophobicity.

Material: The material has the property that it cannot be wetted with water, and when the wetting angle of the material is greater than 90, it is called a hydrophobic material.

Second, the characteristics are different.

1. Hydrophilic materials: molecules have polar or cherry group, and have a great affinity for water.

It attracts water molecules.

or soluble in water. The surface of the solid material formed by these molecules is easily wetted by water.

2. Hydrophobicity: In the composite insulator industry, hydrophobicity, also known as wettability, is determined by composite insulators (silicone rubber.

Outer insulating surface tension.

It was decided that the wettability of water on the outer insulation of the composite insulator was demonstrated.

Third, the judgment method is different.

1. Hydrophilic materials: when the wetting angle is less than or equal to 90 degrees, the cohesion between water molecules is less than the mutual attraction between water molecules on the surface of the material. It is a hydrophilic material.

2. Hydrophobic materials: When the wetting angle of Runsong is greater than or equal to 90°, the cohesion between water molecules on the surface of the material is greater than the mutual attraction between water molecules, which is a hydrophobic material.

Hello, dear, refers to: "When in contact with water, some materials can be wetted by water, while others cannot be wetted by water, for both phenomena, the former is hydrophilic and the latter is hydrophobic. Most of the civil engineering materials, such as bricks, concrete, wood and steel, are hydrophilic materials, while hydrophobic materials mainly include asphalt and paraffin.

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Hydrophilic and hydrophobic materials refer to the following: hydrophilic substances: alcohol, glycerin, starch, cellulose, protein, hydrophobic substances: edible oil, gasoline, diesel, lubricating oil

Hydrophilic materials indicate the affinity of the material with water. At the junction of water, material and air liquid, solid and gas, the tangent line of the surface of the droplet is made, and the tangent line passes through the angle between the water and the surface of the material is called the wetting angle of the material, which is represented. If the wetting angle is 90°, it means that the force between the material and the water is greater than the force between the water molecules, so the material can be wetted by water, and the material is hydrophilic.

Conversely, when the wetting angle is 90°, it means that the force between the material and the water is less than the force between the molecules of the water wheel, then the material cannot be wetted by water, and the material is said to be hydrophobic. Hydrophilic materials (most inorganic silicate materials, gypsum, lime, etc.) have more capillary pores, they have a strong adsorption effect on water. Water-repellent materials such as asphalt have a repelling effect on water, so they are often used as waterproofing materials.

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When hydrophilic and hydrophobic come into contact with water, some materials can be wetted by water, while others cannot be wetted by water, and for these two phenomena, the former is hydrophilic and the latter is hydrophobic. The fundamental reason why a material is hydrophilic or hydrophobic lies in its molecular structure. The molecular affinity between hydrophilic materials and water molecules is greater than the cohesive force between water molecules themselves. Hydrophobic, on the contrary.