Composite material for preparing polyimide-polyvinyl chloride composite foam material and polyimide-polyvinyl chloride composite foam material

Abstract

The invention relates to a nontoxic environment-friendly stable-foaming ultralow-density composite material for producing a polyimide-polyvinyl chloride composite foam material, a method for producing the polyimide-polyvinyl chloride composite foam material from the composite material and a polyimide-polyvinyl chloride composite foam material produced by the method. The minimum density of the prepared foam is 30 kg/m<3>, the compression strength is greater than 0.7 MPa, the tensile strength is greater than 1.7 MPa, the heat conductivity coefficient is less than 0.033 w/m.k, the oxygen index is greater than 28%, the water absorptivity is less than 10%, the closed-cell ratio is greater than 80%, the 70-DEG C relative humidity is 95%, and the foam does not shrink after being placed for more than 96 hours. The preparation process is safe and nontoxic, does not use any chemical foaming agent, and prepares the foam under ordinary pressure. Compared with the traditional formula, the tensile strength and compression strength of the foam are obviously enhanced, and the foam density is obviously lowered.

Description

technical field [0001] The invention relates to a composite material for polyimide polyvinyl chloride composite foam material which is non-toxic, environment-friendly, stable in foaming and ultra-low density, and a method for producing polyimide polyvinyl chloride composite foam material by using the composite material. The invention also relates to the polyimide polyvinyl chloride composite foam material produced from the combined material. Background technique [0002] Structural foam materials are based on plastics (PVC, PET, etc.), and are modified through the penetrating aromatic amide polymerization network. They have the same density as soft foam materials, but they have high strength and are suitable for High-end fields that require light materials and high strength are mainly used in wind power generation, rail transit, yachts, aerospace, building energy conservation and other industries. [0003] The production process of cross-linked foamed polyvinyl chloride foa...

AI Technical Summary

Problems solved by technology

The foaming process needs to be carried out in a high-pressure closed mold, which requires extremely high equipment and is prone to dangers such as leakage and explosion

The foam itself has poor toughness and is easy to crack. After modification with polyether polyol, although the toughness of the foam has been improved, the strength has decreased to a certain extent.

Because the foaming process is difficult to control, the density of the prepared foam is relatively high, the minimum is 50kg / m 3 Left and right, the cost is high, which limits the application field of foam

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