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Method for preparing netted urethane foam

A technology of polyurethane foam and polyurethane, applied in the field of preparation of reticulated polyurethane foam, can solve the problems of large loss of foam strength, limited foam size, long processing time, etc.

Inactive Publication Date: 2005-12-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical corrosion method requires a long processing time, has certain pollution, and the strength loss of the foam is large and the cost is high
Although the explosion method can prepare reticulated foam with high strength and smooth surface, it requires special equipment, and the size of the foam is limited, and the cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: According to formula 1, the raw materials are divided into two components, A and B: component A is all components except isocyanate, including polyether polyol, water, catalyst, foaming agent, and foam stabilizer.

[0031] The B component is isocyanate: toluene diisocyanate TDI (80 / 20): index 1.1~1.2

[0032] A, B material ratio (mass ratio) 100: 110

[0033] Component C: Polystyrene foam microspheres, with an average diameter of about 3mm.

[0034] After mixing component A evenly, add component C, stir and mix well. Then mix with component B evenly, put it into the mold and close the mold for foaming. Ambient temperature: 20°C, raw material temperature 22°C, stirring time 7S, milk time: 8S, drawing time: 45S, non-stick time: 64S, rise time: 30S. The obtained composite foam was cured at 80°C for 2 hours and then demolded.

[0035] The prepared composite foam is immersed in a sufficient xylene solution, immersed at room temperature for 30 minutes, taken out and ri...

Embodiment 2

[0036] Example 2: The composite foam of Example 1 was immersed in an acetone solution at room temperature for 30 minutes, and after washing, a reticulated polyurethane foam was also obtained.

Embodiment 3

[0037] Example 3: The composite foam of Example 1 was immersed in a chloroform solution at room temperature for 30 minutes, and after washing, a reticulated polyurethane foam was also obtained.

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PUM

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Abstract

The invention provides a method for preparing reticular polyurethane foam. The method adopts the mixing of soluble foam microspheres and polyurethane raw materials, and solidifies and shapes them at normal temperature or under heating. The polyurethane foam body containing the soluble foam microspheres is formed by using the microspheres as the support, and then the soluble foam microspheres are dissolved with a solvent to obtain a reticular polyurethane foam material.

Description

Technical field [0001] The invention relates to a method for preparing a reticulated polyurethane foam. Background technique [0002] Reticulated polyurethane foam was first successfully studied by the American Scott Paper Company in the early 1960s. It is made of flexible polyurethane foam through net treatment. It is characterized by low density and an open cell structure. The shape is a pentagonal dodecahedron. The intersection of the face and the face is called the meridian, and the face or wall film formed between the meridians disappears after the netting treatment. Therefore, the wall shell of the reticulated foam is a three-dimensional skeleton, and it is a flexible open-cell foam, which contains more than 97% of the void volume. [0003] Reticulated polyurethane foam was first used as a filling material in military aircraft fuel tanks, which has anti-explosion and self-sealing effects. When the aircraft is turning or doing other actions, it can reduce fuel sloshing and a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/38C08L75/04
Inventor 王翔王钧杨小利段华军
Owner WUHAN UNIV OF TECH