Polyurethane combined material, method for preparing polyurethane composite through polyurethane combined material, and application of prepared product

Abstract

The invention discloses a polyurethane combined material. The polyurethane combined material is prepared from an isocyanate reactivity component A and an isocyanate component B. The component A is prepared from combined polyether polyol, chain extender, surface active agents, internal releasing agents, catalysts and foaming agents. The component B is prepared from at least one of polyaryl polymethylene isocyanate, methylene diphenyl diisocyanate and isocyanate prepolymers. The weight ratio of the component A to the component B is 100 to 130-180. The combined material has excellent storage stability and can be used for preparing a polyurethane composite. The prepared composite has high strength, high temperature-resistant performance and a larger mold release time number, and the prepared composite can be used for automobile skylights, automobile spare wheel cover plates, building decoration and furniture.

Description

technical field [0001] The invention relates to the field of polyurethane, in particular to a polyurethane composite material, and in addition to a polyurethane composite material. Background technique [0002] Polyurethane polymers are very good adhesives in composite materials, and release agents are used in the processing and production of composite materials, so that parts can be easily demolded and taken out of the mold. The processing temperature of polyurethane reinforced paper honeycomb composite material is usually 90-120°C, and the demoulding time is about 70-100s. When using a waxy or water-based external mold release agent, it usually takes about 30-60 seconds to spray the mold. If the external mold release agent is sprayed after each demoulding, the operation time will increase by 25-70% each time, which will Affect production processing efficiency and production cost. [0003] Therefore, adding an internal release agent to the polyurethane composite material ...

AI Technical Summary

Problems solved by technology

[0008] Chinese patent CN1204346 discloses a self-releasing dense or porous molded body containing optional reinforcing materials, polyisocyanate-polymerized addition products and an internal release agent, the internal release agent being an alkyl succinimide , the processing method is more complex and the storage stability in the composite material is poor

[0009] Chinese patent CN101874051A discloses a polyurethane foam containing dialkyl cyclohexanedicarboxylates as an internal release agent. This patent shows that the number of demoulding times can be increased to about 4 times when using the internal release agent, although it can increase its The number of demoulding times, but the increased demoulding times are not many, adding this internal release agent is of little significance in actual operation

Adding a large amount of internal release agent and mineral oil to the composite material not only increases the instability of the system, but also easily reduces the final mechanical properties of the product

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