A spray-molded high-density polyurethane foam and its preparation method

A polyurethane foam and high-density technology, which is applied in the fields of box and pipeline insulation, interlayer filling, and buffer layer. It can solve the problems of foam heat dissipation, fast accumulation of reaction heat and slow transfer, foam prone to core burning, etc., to achieve excellent heat preservation Performance and mechanical strength, density and total thickness can be adjusted, and the effect of good thermal insulation performance

Active Publication Date: 2020-10-23
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The difficulty of high-density polyurethane foam spray molding is that as the density increases, the viscosity of the foaming material increases, the heat of reaction accumulates quickly and transfers slowly, and the spraying pressure is difficult to control, which makes the final formed foam prone to defects such as core burning, cracking, and delamination. ; and due to the difficulty of heat dissipation inside the foam, it is difficult to form a thicker foam layer

Method used

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  • A spray-molded high-density polyurethane foam and its preparation method
  • A spray-molded high-density polyurethane foam and its preparation method
  • A spray-molded high-density polyurethane foam and its preparation method

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preparation example Construction

[0038] The preparation method of above-mentioned spray molding high-density polyurethane foam comprises the following steps:

[0039] (1) To prepare component A, take 100 parts of polyether polyol I, 100 parts of polyether polyol II, 40 parts of flame retardant, 15-50 parts of blowing agent, 0.8-2.0 parts of catalyst I, 1.5-4.0 parts of catalyst Ⅱ. 6~10 parts of foam stabilizer, placed in a mechanical mixing tank and stirred for 20~30 minutes, poured into the material tank of component A for spraying, and the pump of component A is submerged in the material.

[0040] (2) Component B material distribution Put plastic gauze on the mouth of component B material barrel for spraying, take 280-395 parts of polymethylene polyphenyl isocyanate, filter through plastic gauze, and remove the crystal particles that may exist in it , Pour it into the material barrel, and the component B lifting pump is submerged in the material.

[0041] (3) Temperature and humidity control of the spray b...

Embodiment 1

[0047] A spray-molded high-density polyurethane foam and a preparation method thereof, comprising the steps of:

[0048] (1) Take 10kg polyether polyol Ⅰ, 10kg polyether polyol Ⅱ, 4kg flame retardant, 4kg foaming agent, 0.15kg catalyst Ⅰ, 0.35kg part catalyst Ⅱ, 0.8kg foam stabilizer, and place them in a mechanical mixing tank Stir inside for 20-30 minutes, then pour into the component A bucket for spraying, and the component A pump is submerged in the material.

[0049] (2) Lay plastic gauze on the mouth of component B material barrel for spraying, take 30kg polymethylene polyphenyl isocyanate, filter it through plastic gauze, pour it into the material barrel, and put the material pump of component B into the material .

[0050] (3) The temperature of the spray booth is 26°C, and the relative humidity is ≤57%.

[0051] (4) Set the feed volume ratio A:B=1.0:1.0, the feed pump pressure is 0.3MPa, the motor frequency is 36Hz, and the feed temperature is 45°C.

[0052] (5) Pro...

Embodiment 2

[0056] A spray-molded high-density polyurethane foam and a preparation method thereof, comprising the steps of:

[0057] (1) Take 10kg polyether polyol Ⅰ, 10kg polyether polyol Ⅱ, 4kg flame retardant, 3kg foaming agent, 0.15kg catalyst Ⅰ, 0.35kg part catalyst Ⅱ, 0.8kg foam stabilizer, and place it in a mechanical mixing tank Stir inside for 20-30 minutes, then pour into the component A bucket for spraying, and the component A pump is submerged in the material.

[0058] (2) Lay plastic gauze on the mouth of component B material barrel for spraying, take 30kg polymethylene polyphenyl isocyanate, filter it through plastic gauze, pour it into the material barrel, and put the material pump of component B into the material .

[0059] (3) The temperature of the spray booth is 25.3°C, and the relative humidity is ≤45%.

[0060] (4) Set the feed volume ratio A:B=1.0:1.0, the feed pump pressure is 0.3MPa, the motor frequency is 40Hz, and the feed temperature is 45°C.

[0061] (5) Pro...

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Abstract

The invention relates to a spray molding high-density polyurethane foam and a preparation method thereof. The preparation method comprises: uniformly mixing polyether polyol, a flame retardant agent,a foaming agent, a catalyst, a foam stabilizing agent and polymethylene polyphenyl isocyanate according to a certain ratio, and carrying out high pressure atomization spray molding through a spray foaming machine, wherein the total thickness of the foam layer can be controlled through layered spraying. According to the present invention, the limitation in the casting molding of the high-density polyurethane foam is broken through, the spray molding of the high-density polyurethane foam is achieved, the technical difficulties that the interior of the foam easily produces foam heartburn, cracking and layering along with the increase of the density of the foam can be overcome, and the convenient and continuous construction of the foam layer on the large-area surface within the short period can be achieved; and the spray molding high-density polyurethane foam has the density of 60-250 kg / m<3>, and has advantages of uniform texture, controlled thickness, excellent thermal insulation property, and excellent mechanical property.

Description

technical field [0001] The invention relates to a spray-molded high-density polyurethane foam and a preparation method thereof, belonging to the fields of interlayer filling, buffer layer, box body and pipeline insulation, etc. Background technique [0002] High-density polyurethane foam is usually prepared by casting method, and the increase of density can be realized by closed mold pressurization. At present, the casting method for preparing high-density polyurethane foam is mature and can be mass-produced. However, this method has a high investment cost in the mold, and the shape that the foam can cover is very limited, generally a continuous flat plane or an arc surface. Once the shape changes, even the foam poured with the same formula needs to redesign the mold. In mass production, multiple sets of molds need to be invested. The manual disassembly and assembly of the molds is time-consuming and labor-intensive, and subsequent processes such as processing, splicing, as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/48C08J9/14C08K5/521B29C44/50B29C44/60C08G101/00
Inventor 王方颉赵一搏马晶晶马晓静申雄刚许小强
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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