Halogen-free flame-retardant polyurethane hard bubble heat preserving material and preparation method thereof

Abstract

The invention relates to a halogen-free flame-retardant polyurethane hard bubble heat preserving material and a preparation method thereof. The heat preserving material consists of a component A and a component B, wherein the weight ratio of the component A to the component B is 1:(1.0-1.3); the component A consists of 75-90 parts by weight of polyether polyol, 0.5-5 parts by weight of a catalyst, 1-5 parts by weight of cyclopentane serving as a foaming agent, 0.5-3 parts by weight of a foam stabilizer and 10-40 parts by weight of a halogen-free flame retardant; and the component B is polymerized polyisocyanate. The preparation method comprises the following steps of: uniformly mixing an expansion flame retardant, an inorganic hydroxide and a polymer / inorganic nanomaterial to obtain a halogen-free flame retardant component; uniformly mixing the polyether polyol, catalyst, foaming agent and foam stabilizer, adding the halogen-free flame retardant component, and continually mixing uniformly at the normal temperature to obtain a component A; and mixing the component A with a component B by stirring, and foaming to obtain the halogen-free flame-retardant polyurethane hard bubble heat preserving material. The method is simple and convenient, and has high practicability; the obtained flame-retardant heat preserving material has a high fireproof level; and the heat preserving material is environment-friendly, and is superior to the conventional organic flame-retardant heat preserving material in the market.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant polyurethane rigid foam insulation material and a preparation method thereof. Background technique [0002] Polyurethane foam material is currently recognized as the best thermal insulation material in the world. It has the advantages of small thermal conductivity, high compressive strength, good adhesion, and easy processing. It is widely used in electrical appliances, refrigerators and freezers, building walls, industrial pipelines and transportation. The thermal insulation of refrigerated vehicles is a new growth point of application demand in recent years. However, compared with traditional inorganic heat insulation materials, non-flame retardant polymer foam materials including polyurethane foam materials have disadvantages such as flammability and fast flame propagation speed, especially the problem of large smoke production is very prominent, and has been It has aroused the attention of th...

AI Technical Summary

Problems solved by technology

However, the cost of the flame-retardant polyurethane insulation material prepared by the above method is relatively high, and it is difficult to popularize it on a large scale. In addition, halogen groups are generally introduced, which is difficult to solve for environmental protection.

[0005] Additive flame retardants are mostly used in polyether polyol systems, introducing liquid phosphate, melamine, ammonium polyphosphate (APP), red phosphorus, nanoclay, flame retardants containing elements such as chlorine, bromine, and phosphorus. Form a stable thixotropic dispersion or microcapsule dispersion in alcohol, such as CN200810071439.8, but the flame retardant effect is not very good

Especially the most widely used liquid phosphate ester in the market is easy to precipitate and bloom from the polyurethane matrix, and the flame retardant effect is also affected to a certain extent