Refrigerator insulation material are what materials made?

The insulation material of refrigerator is polyurethane foam, a kind of foamed plastic; rigid polyurethane foam is a microcellular foam body with dense structure made by polymerization of isocyanate and polyalcohol as the basic raw material, which has the excellent performance of light weight, high specific strength, impermeable to water, non-hygroscopic, insulating, shock-proof, sound-absorbing, oil-resistant, chemical-resistant and so on.

Extended information

Features

Insulation materials industrial equipment and pipeline insulation, the use of insulation measures and materials aerogel was first used in the United States in the development of NASA's space suits insulating lining. Has a low thermal conductivity, low density, high flexibility, fire and water resistance and other characteristics. Its room temperature thermal conductivity of 0.018W / (K-m) and absolute waterproof, thermal insulation performance is the traditional material 3 to 8 times.

The thermal insulation lining has low thermal conductivity, low density, high flexibility, fire and waterproof properties.

Light weight, generally 10-96kg/m3, 20kg/m3 or less felt, 24-48kg/m3 for the medium hardboard, 48-96kg/m3 for hardboard, of which 48kg/m?can be made ceiling, softening point of about 500°C, insulation 300°C, the United States with a large amount of k = 0.9.

Development space

"In December 2012, the Ministry of Public Security, "on further clarification of the relevant requirements for the supervision and management of the fire of the external thermal insulation materials of civil buildings," referred to as No. 65 is no longer enforced, polyurethane thermal insulation materials to 'proper name '.

As the key insulation material for refrigerator freezers, solar water heaters, energy-saving plants, building exterior walls, cold storage, etc., the polyurethane foam insulation market has ushered in a huge development space. In January this year, the polyurethane foam insulation industry is encouraged by favorable policies to achieve rapid growth, production increased by more than 10% year-on-year."

It is reported that in 2011, the Ministry of Public Security issued No. 65, the civil building exterior insulation materials should be used for combustion performance of Class A materials, mainly inorganic materials. Polyurethane foam belongs to the B1 level of flame retardant insulation materials, and its application in the market of external building insulation is restricted. With the lifting of the restrictive policy, polyurethane insulation material enterprises have undoubtedly become the biggest beneficiary.

Flame-retardant principle

Polyurethane foam generally through the addition of flame-retardant agent to improve the flame retardancy of the foam, in order to slow down the combustion, smoke and even make the fire part of the self-extinguishing. Polyol containing flame retardant elements (i.e. reactive flame retardant) can also be used as raw material for foam.

References:

Baidu Encyclopedia-Polyurethane Foam