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Low-smoke low-toxicity flame-retardation hard polyurethane foam plastics and preparation method thereof

A technology of rigid polyurethane and foamed plastics, which is applied in the field of foaming materials, can solve the problems of increased smoke production and toxicity, and achieve the effects of reducing the production amount, reducing the total heat release amount, and reducing the heat release rate.

Inactive Publication Date: 2016-05-25
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the flame retardant treatment of polyurethane foam is mainly to add flame retardants. Although its flame retardant performance has been improved, the smoke production and toxicity of the system often increase a lot during combustion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) 100 parts of polypropylene oxide diol with a hydroxyl value of 450mgKOH / g, 2 parts of cuprous oxide, 1 part of zirconium phosphate, and 2 parts of attapulgite were stirred and mixed at a frequency of 200 kHz and a temperature of 60 ° C. Process for 30 minutes;

[0036] (2) Then add 15 parts of expandable graphite, 3 parts of purified water, 3 parts of polysiloxane, 5 parts of dibutyltin dilaurate, triethylenediamine and triethanolamine, at room temperature at a speed of 3000r / min Stir evenly to obtain polyol mixture;

[0037] (3) Add 150 parts of isocyanate, stir evenly at 25°C, pour into the mold for foaming, and release the mold after aging at 80°C to obtain rigid polyurethane foam.

Embodiment 2

[0052] (1) Mix 100 parts of polyethylene oxide glycol, 2 parts of nano-iron oxide, 1 part of cobalt phosphate, and 1 part of attapulgite with a hydroxyl value of 500 mgKOH / g at a frequency of 200 kHz and a temperature of 80 ° C. Sonicate for 30 minutes;

[0053] (2) Then add 18 parts of expandable graphite, 3 parts of purified water, 3 parts of polysiloxane, 5 parts of dibutyltin dilaurate, triethylenediamine and triethanolamine, at room temperature at a speed of 3000r / min Stir evenly to obtain polyol mixture;

[0054] (3) Add 150 parts of isocyanate, stir evenly at 25°C, pour into the mold for foaming, and release the mold after aging at 80°C to obtain rigid polyurethane foam.

[0055] The performance of the rigid polyurethane foam is shown in Table 2. It can reach the V-0 level in the UL-94 vertical burning test, its limiting oxygen index value reaches 34%, and its maximum heat release rate is 115KW / m 2 , 71.5% lower than pure polyurethane foam, the total heat release is 1...

Embodiment 3

[0057] (1) Mix 100 parts of polytetrahydrofuran diol, 1 part of ferrous oxide, 2 parts of tin phosphate, and 2 parts of attapulgite with a hydroxyl value of 200 mgKOH / g, and then perform sonication at a frequency of 200 kHz and a temperature of 40 ° C. 60 minutes;

[0058] (2) Then add 15 parts of expandable graphite, 5 parts of pentane, 4 parts of polysiloxane, 6 parts of dibutyltin dilaurate, triethylenediamine and triethanolamine, at room temperature at a speed of 2800r / min Stir evenly to obtain polyol mixture;

[0059] (3) Add 130 parts of isocyanate, stir evenly at 25°C, pour into the mold for foaming, and release the mold after aging at 80°C to obtain rigid polyurethane foam.

[0060] The performance of the rigid polyurethane foam is shown in Table 2. It can reach the V-0 level in the UL-94 vertical burning test, its limiting oxygen index value reaches 32%, and its maximum heat release rate is 167KW / m 2 , 58.7% lower than pure polyurethane foam, the total heat release ...

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Abstract

The invention discloses low-smoke low-toxicity flame-retardation hard polyurethane foam plastics and a preparation method thereof. The low-smoke low-toxicity flame-retardation hard polyurethane foam plastics comprise the following raw materials: 100 parts of polyether polyol, 120-150 parts of isocyanate, 10-20 parts of an intumescent flame retardant, 1-3 parts of a metallic compound, 0.5-2 parts of attapulgite, 1-5 parts of a foaming agent, 1-4 parts of a foaming stabilizer, and 3-6 parts of a foaming catalyst. The preparation method comprises the following steps: mixing, casting and foaming. The low-smoke low-toxicity flame-retardation hard polyurethane foam plastics have good flame resistance, and achieve a V-0 grade in an UL94 vertical combustion test. At the same time, an expandable charcoal layer formed after combustion of the fire retardant, and the added metallic compound and the attapulgite are capable of absorbing and catalyzing toxic gas, effectively reduce heat release rate and total heat release rate of the materials, and can solve the problem of large flue gas generation amount of the foam plastics prepared by the additive-type flame retardant.

Description

technical field [0001] The invention belongs to the technical field of foaming materials, and in particular relates to a low-smoke, low-toxicity, flame-retardant rigid polyurethane foam and a preparation method thereof. Background technique [0002] Rigid polyurethane foam (RPUF) is a new type of building insulation material. Compared with traditional building insulation materials, it has the characteristics of small thermal conductivity, high compressive strength, good adhesion and easy processing. However, because polyurethane foam is extremely flammable, and the oxygen index in the air is only 20.0%, fire accidents caused by polyurethane wall insulation materials have occurred frequently in recent years. The pyrolysis reaction of polyurethane is mainly random chain breakage and depolymerization of the main chain, generating a large number of simple structure hydrocarbons and isocyanates, carbon monoxide, carbon dioxide, hydrogen cyanide, acrylonitrile and other toxic sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08K13/02C08K3/32C08K3/04C08K5/053C08K3/34C08K3/22C08J9/08C08J9/14C08G101/00
Inventor 杨桂生袁海霞
Owner HEFEI GENIUS NEW MATERIALS
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