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What is a blowing agent

wallpapers Industry 2020-04-16

Whether it is our daily life or industrial production, a large number of various foam products are used. The use of these foam products can achieve the purposes of heat insulation, sound insulation, lightweight, increased elasticity, and shock absorption. The performance of these foam products has benefited to a certain extent from the choice of blowing agents.

Blowing agent concept

The foaming agent is also known as a foaming agent, which can not only reduce the surface tension of the liquid but also have better-foaming performance. Under certain conditions, the foaming agent can form closed cells inside the fluid, such as cement paste, asphalt, gypsum paste, etc., thereby improving its performance.

Classification of blowing agent

When preparing foam with a foaming agent, the foaming agent includes a physical foaming agent, chemical foaming agent, and surfactant foaming agent according to the difference in the manner of forming pores. The physical foaming agent achieves the foaming purpose due to the change of its physical state; the chemical foaming agent produces the gas due to the chemical change; the surfactant foaming agent is due to the liquid during the stirring process The reduction in surface tension then foams to form microcellular foam.

Application of blowing agent

The blowing agent is widely used in industry because of its good performance in food, aerated candies, cakes, and other commonly used egg whites and gelatin as foaming agents. Egg protein is fermented by egg white to obtain a dried product; gelatin refers to the protein extracted from the animal's bones, fur, and raw gums inside the connective tissue. The use of the foaming agent in the cake can significantly improve its tissue state, prevent the aging of starch, and make it fluffier and more tasteful. In terms of daily chemicals, sodium lauryl sulfate is commonly used as a foaming agent in toothpaste; the amount of foam generated by the foaming agent is usually used in laundry detergent to measure its performance. In terms of plastics, gas is generated by the reaction of isocyanate and water, or HCFC gasification and foaming to make polyurethane foam. Because of its low thermal conductivity and lightweight, it is widely used as thermal insulation material; The foaming agent is foamed in polystyrene, and the lightweight plastic board is used for heat insulation and heat insulation of buildings. It is characterized by low density, strong earthquake resistance, strong heat insulation ability, and low project cost. In terms of materials, the use of protein foaming agents to prepare foamed ceramics, due to its advantages of large specific surface area, low density, good chemical stability, thermal stability, and dimensional stability, etc. Constant temperature, medical materials, etc. are widely used. In terms of construction, the global energy consumption of buildings has always been high, and building energy conservation has been paid more and more attention. Organic insulation materials have poor durability, reduced strength, flammability, and easy to produce poisonous smoke, resulting in casualties. The use of foam is limited; foam concrete made with the foaming agent has the advantages of sound absorption, heat insulation, fire resistance, and earthquake resistance, easy pouring molding, and adhesion to the wall and its application in construction is more and more widely.

Since 1938. when the United States introduced the world's first concrete foaming agent, visual, people have been devoted to the research of foaming agents, and its application effect is very significant. In the same period, Japan, Italy, the Soviet Union, etc. also began the development of blowing agents, and their technology and testing standards were gradually improved. A. Romania and others use recycled polyethylene terephthalate waste as raw materials and animal protein as a foaming agent to make cement-based foam concrete cementing materials, which not only solves the difficulty of degradation due to plastic bottles and plastic bags As a result of the white pollution, a new type of lightweight building material has been obtained, which reduces production costs and saves energy. The research results show that: the use of waste. It can significantly improve the fluidity of the slurry, improve the mechanical properties of foam concrete, reduce its bulk density, and increase the heat capacity.

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