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Process for producing flexible polyurethane foam

A technology for elastic polyurethane and foam materials, applied in the field of elastic polyurethane foam materials, can solve the problems of inability to effectively reduce foaming and curing exothermic temperature, physical properties such as compressive residual strain damage, and lower calorific value.

Active Publication Date: 2009-09-30
INOAC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above prior art of adding polyolefin powder, although the effect on reducing the exothermic temperature of foaming and curing is observed, it is necessary to provide the amount of polyolefin powder to effectively reduce the calorific value
In this case, an increase in the amount of polyolefin powder results in too high a density of the resulting elastic polyurethane, and deterioration of physical properties such as compressive residual strain
Since the polyolefin powder cannot be blended in a sufficient amount in order to prevent the destruction of these physical properties, there is a problem that the exothermic temperature of foaming and curing cannot be effectively lowered, and as a result, the coloring caused by scorch cannot be reduced

Method used

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  • Process for producing flexible polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 9 and comparative Embodiment 1 to 3

[0043] First, hydrates of inorganic compounds having a specific gravity of 1.5 to 4.0 used in Examples and Comparative Examples are shown below.

[0044] Dihydrate gypsum: the specific gravity of dihydrate gypsum is 2.32, and the average particle size is 40μm

[0045] Ferrous sulfate hydrate: a mixture of ferrous sulfate monohydrate to pentahydrate, with a specific gravity of 2.97 and an average particle size of 40 μm

[0046] Magnesium sulfate hydrate: Magnesium sulfate heptahydrate, specific gravity 1.68, average particle size 50μm

[0047] Polyethylene powder: Low-density polyethylene powder with a specific gravity of 0.93 and an average particle diameter of 40 μm, produced by Mitsui Chemicals Inc

[0048] Incidentally, the heat of vaporization of water is 2259 J / g, and the latent heat of fusion of polyethylene powder is 198 J / g. Then the heat absorption effect of water is obviously superior to that of polyethylene powder.

[0049] A mixture is prepared by mixing polyure...

Embodiment 1

[0067] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6

[0068] Polyol GP3000 100 100 100 100 100 100

[0069] Water 7.0 7.0 7.0 5.0 7.0 5.0

[0070] Amine catalyst LV33 0.4 0.4 0.4 0.4 0.4 0.4

[0071] Silica foam stabilizer

[0072] B8110 1.0 1.0 1.0 1.0 1.0 1.0

[0073] Stannous octoate MRH110 84.1 84.1 84.1 62.8 84.1 62.8

[0074] Polyisocyanate T-80 110 110 110 110 110 110

[0075] Isocyanate Index 30 - 100 30 - 50

[0076] Ferrous sulfate hydrate - 30 - - 100 -

[0077] Density (kg / m 3 ) 17.6 17.3 21.0 22.4 20.6 24.8

[0078] Hardness (N) 114 111 142 131 141 144

[0079] Tension (1Pa) 130 135 105 145 123 108

[0080] Extension (%) 170 173 105 203 118 105

[0081] Compressive residual strain (%) 4.5 4.3 4.8 3.1 4.1 4.7

[0082] Maximum exothermic temperature (°C) 141 145 105 132 112 102

[0083] drop from maximum exothermic temperature

[0084] Time required for 10°C (minutes) 9 10 8 7 9 7

[0085] Color Difference (ΔYI) ...

Embodiment 7

[0087] Example 7 Example 8 Example 9

[0088] Polyol GP3000 100 100 100

[0089] water 7.0 7.0 7.0

[0090] Amine catalyst LV33 0.4 0.4 0.4

[0091] Silica foam stabilizer

[0092] 1.0 1.0 1.0

[0093] B8110

[0094] Stannous octoate MRH110 0.2 0.2 0.2

[0095] Polyisocyanate T-80 84.1 84.1 84.1

[0096] Isocyanate Index 110 110 110

[0097] Magnesium sulfate hydrate 10 100 10

[0098] Dihydrate gypsum - - 10

[0099] Density (kg / m 3 ) 17.1 20.8 17.6

[0100] Hardness (N) 114 141 121

[0101] Tension (kPa) 130 103 123

[0102] Extension (%) 170 107 143

[0103] Compressive residual strain (%) 4.5 4.8 4.7

[0104] Maximum exothermic temperature (°C) 137 118 127

[0105] drop from maximum exothermic temperature

[0106] 9 7 8

[0107] Time required for 10°C (minutes)

[0108] Color difference (ΔYI) 3 1.2 2.1

[0109] table 3

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Abstract

Elastic polyurethane foam prepared by mixing polyurethane raw materials containing polyol, polyisocyanate, blowing agent and catalyst with inorganic compound hydrate having a specific gravity of 1.5 to 4.0 and subjecting the above polyurethane raw materials to foaming and curing reactions . The inorganic compound hydrate is preferably ferrous sulfate hydrate, calcium sulfate hydrate or magnesium sulfate hydrate. The preferable decomposition temperature of the above-mentioned inorganic compound hydrate is from 100 to 170°C. Then, the increase in exothermic temperature caused by foaming and curing is reduced by the evaporation of water formed by the decomposition of the above-mentioned inorganic compound hydrate.

Description

field of invention [0001] The present invention relates to a method of producing resilient polyurethane foam for use as a cushion material, which can be made into furniture, bedding, car seats, and the like. Background technique [0002] So far, the production density is 25kg / m 3 In the case of using only water as a blowing agent, or lower elastic polyurethane foam, the foaming and curing exothermic temperature reaches 170°C or higher due to the increase in the amount of water to be added. Therefore, there is a possibility of spontaneous combustion due to oxidative degradation (scorching) of polyurethane and coloring of the resulting elastic polyurethane foam due to scorching. In order to avoid these situations, it is known to add dichloromethane or liquid carbon dioxide as a blowing aid without changing the amount of water added conventionally. [0003] However, dichloromethane is a substance that has a bad influence on the environment, etc., so its use is regulated. On ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/06C08G101/00
Inventor 矢野忠史
Owner INOAC CORP