Polyurethane composition for glass fiber reinforced honeycomb sandwich panels and application method of polyurethane composition

Abstract

The invention discloses a polyurethane composition for glass fiber reinforced honeycomb sandwich panels and an application method of the polyurethane composition. The polyurethane composition comprises a component A and a component B; the component A comprises 40-70% of polyether polyol 1, 5-10% of polyether polyol 2, 5-10% of polyether polyol 3, 0-10% of polyester polyol 1, 4-10% of crosslinkingagents, 5-15% of chain extenders, 0.2-2% of foam stabilizers, 0.2-1.5% of catalysts, 5-10% of flame retardants, 0.2-1% of water, 0.2-2% of internal releasing agents and 0.2-1% of other additive; the component B comprises polyaryl polymethylene isocyanate; the polyether polyol 1 is prepared by taking D-glucitol as an initiator and alkali metal hydroxide as a catalyst, performing anionic polymerization on 1,2-propylene oxide and adding ethylene oxide for terminating; the polyether polyol 2 is propylene oxide polyether polyol with the functionality being 2, and is prepared by taking bisphenol A as an initiator; the polyether polyol 3 is prepared by taking glycerol as an initiator and is terminated by ethylene oxide; the polyester polyol 1 is obtained by polycondensation reaction between terephthalic acid and ethylene glycol.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a polyurethane material for glass fiber reinforced honeycomb sandwich panels and a preparation method for glass fiber reinforced honeycomb sandwich panels. Background technique [0002] With the rapid development of the automobile industry, the lightweight and flame retardancy of automotive interior materials have become the focus of the auto parts industry. The overall density of polyurethane materials for glass fiber reinforced honeycomb sandwich panels can be as low as 0.3-0.5g / cm 3 , and has the characteristics of high strength, light weight, sound insulation, heat insulation, etc., and is more suitable for use on auto parts such as car sunroofs, spare tire covers, and coat racks. However, due to its low density and poor dimensional stability, good flame retardancy and dimensional stability have become urgent problems to be solved for automotive glass fiber reinforced honeycomb s...

AI Technical Summary

Problems solved by technology

However, the dimensional stability of this material is poor, especially when preparing products with arc angles such as skylights, and the flame retardancy is difficult to meet the flame retardancy requirements of automotive interior materials.

[0006] The patent document CN 107512057A discloses a polyurethane laminated molded product, which uses vegetable oil-based polyol or its derivatives and modified products to improve the release property, and the polyurethane laminated molded product provided by it has good release properties. moldability and productivity, but the flame retardancy is difficult to meet the flame retardancy requirements of automotive interior materials

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