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(White material): Pre-combined by polyether, catalyst, foam stabilizer, flame retardant, etc. We usually use polyurethane sandwich double-sided color steel cold storage insulation board or directly make polyurethane vertical surface coating on the wall. Do insulation. In the southeastern part of China, polyurethane sandwiched double-sided color steel cold storage insulation boards are mostly; in the northwest, polyurethane facades are used for thermal insulation. So what are the advantages and disadvantages of polyurethane facade spraying for insulation?
1. Thermal insulation and energy conservation. Polyurethane rigid foam has a very low thermal conductivity, which is unmatched by other materials, and is considered to be inexpensive.
2, excellent performance, a wide range of applications. Due to various engineering, there are various mechanical properties and thermal conductivity requirements for thermal insulation materials, while rigid foam plastics have the characteristics of light weight and high strength, and according to the different requirements of the project, the formula is adjusted to obtain the machinery that meets the engineering requirements. Performance, and thus the quality requirements of the product.
3. Advanced technology and convenient construction. Polyurethane rigid foam processing technology is simple, can be prefabricated, but also can be foamed on-site, can be poured and sprayed, change the processing technology according to the needs of the project, and engage in various constructions. Especially on-site spraying, not only can save manpower, material resources, but also can spray complex shapes, without any processing, with self-adhesive properties of metal, wood, cement and other non-metallic materials. The degree of bonding generally reaches or exceeds the breaking strength of the foam itself.
4. Chemical mechanism of polyurethane rigid foam formation: The formation process of polyurethane rigid foam is complicated. In the presence of catalysts, foam stabilizers, foaming agents and other additives, polyethers and isocyanates pass complex chemical reactions (exothermic) and physics. The changes formed mainly include chain growth reaction, gas generation reaction and cross chain reaction.
5, the production of polyurethane rigid foam raw materials: the production of polyurethane rigid foam raw materials are: isocyanate, polyether, catalyst, foam stabilizer, flame retardant and so on. At present, hard foam production is often divided into two groups:
1), (white material): pre-combined by polyether, catalyst, foam stabilizer, flame retardant, etc., so the white material is usually called a combined polyether,
2), (black): aggregate MDI
6, service life: the hard foam industry from the initial period to the present 30-40 years of age has passed, practice has proved that hard foam is able to withstand the test of time, its performance is almost unchanged. With the development of food processing industries such as marine fisheries and meat, the production areas often process, freeze and refrigerate these foods in order to reduce spoilage and improve resource utilization. Traditional foods from all over the world are exported to other countries. Cold storage, freezing and cold storage rooms have become indispensable facilities for economic development and can bring considerable economic benefits.
This article is organized by Shandong Dingsheng Refrigeration Equipment Co., Ltd.! If you have any enquiries, please pay attention to the WeChat public number "Dingsheng Refrigeration" or call 15725158383! ! !
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