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A kind of isocyanate composite material of polyurethane foam and preparation method thereof

A polyurethane foam and isocyanate technology, applied in the foaming field, can solve the problems of high harm to operators, high toxicity, low foam density, etc., and achieve the effects of strong versatility, high compressive strength and elongation

Active Publication Date: 2022-07-22
WUXI GISSING AUTO PARTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the foam density used for wet roofs is usually low, for which toluene diisocyanate is usually used, and this isocyanate is highly toxic, and the production process is very harmful to operators

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An isocyanate composite material for polyurethane foam, in parts by mass, comprises 60 parts of polymethylene polyphenyl polyisocyanate, 25 parts of diphenylmethane diisocyanate and 15 parts of liquefied modified diphenylmethane diisocyanate.

[0018] The polymethylene polyphenyl polyisocyanate is polymerized MDI, the NCO content is 30%, the MDI content is 45, the viscosity is 100 cP, and the acidity is 50 mg / kg;

[0019] The MDI content of the diphenylmethane diisocyanate is 99.0%, the 2,4' isomer content is 45%, and the melting point is 10°C.

[0020] The liquefied modified diphenylmethane diisocyanate is modified by carbodiimide, the NCO content is 28%, the acidity is 5mg / kg, the viscosity is 30cP, and the melting point is 10°C.

[0021] The preparation method of the isocyanate composition material of described polyurethane foam, comprises the following steps:

[0022] Put 600kg of polymerized polymethylene polyphenyl polyisocyanate, 250kg of diphenylmethane diisocy...

Embodiment 2

[0026] An isocyanate composite material for polyurethane foam, in parts by mass, comprises 75 parts of polymethylene polyphenyl polyisocyanate, 15 parts of diphenylmethane diisocyanate and 10 parts of liquefied modified diphenylmethane diisocyanate.

[0027] The polymethylene polyphenyl polyisocyanate is polymerized MDI, the NCO content is 31%, the MDI content is 55, the viscosity is 200 cP, and the acidity is 100 mg / kg;

[0028] The MDI content of the diphenylmethane diisocyanate is 99.4%, the 2,4' isomer content is 50%, and the melting point is 15°C.

[0029] The liquefied modified diphenylmethane diisocyanate is modified by carbodiimide, the NCO content is 29%, the acidity is 20 mg / kg, the viscosity is 50 cP, and the melting point is 12°C.

[0030] The preparation method of the isocyanate composition material of described polyurethane foam, comprises the following steps:

[0031] Put 1500kg of polymeric polymethylene polyphenyl polyisocyanate, 300kg of diphenylmethane diis...

Embodiment 3

[0035] An isocyanate composite material for polyurethane foam comprises, in parts by mass, 90 parts of polymethylene polyphenyl polyisocyanate, 5 parts of diphenylmethane diisocyanate and 5 parts of liquefied modified diphenylmethane diisocyanate.

[0036] The polymethylene polyphenyl polyisocyanate is polymerized MDI, the NCO content is 32%, the MDI content is 60, the viscosity is 300 cP, and the acidity is 200 mg / kg;

[0037] The MDI content of the diphenylmethane diisocyanate is 99.8%, the 2,4' isomer content is 55%, and the melting point is 20°C.

[0038] The liquefied modified diphenylmethane diisocyanate is modified by carbodiimide, the NCO content is 30%, the acidity is 40 mg / kg, the viscosity is 100 cP, and the melting point is 15°C.

[0039] The preparation method of the isocyanate composition material of described polyurethane foam, comprises the following steps:

[0040] Put 4500kg of polymerized polymethylene polyphenyl polyisocyanate, 250kg of diphenylmethane dii...

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Abstract

The invention belongs to the technical field of foaming, and in particular relates to an isocyanate composition of polyurethane foam and a preparation method thereof. The isocyanate composite material of the polyurethane foam of the present invention, in parts by mass, comprises 60-90 parts of polymethylene polyphenyl polyisocyanate, 5-25 parts of diphenylmethane diisocyanate and liquefaction modified diphenylmethane diisocyanate 5-15 parts of isocyanate. Compared with the conventional isocyanate composite materials on the market, the isocyanate composite material prepared by the invention has obvious price advantage, and at the same time, it can be combined with more than 80% of the roof polyol composite materials on the market for foaming, and can be made into high-strength and high-elongation composite materials. Wet-laid canopy semi-rigid polyurethane foam.

Description

technical field [0001] The invention belongs to the technical field of foaming, and in particular relates to an isocyanate composition of polyurethane foam and a preparation method thereof. Background technique [0002] The wet-process polyurethane canopy formed by semi-rigid polyurethane foam has many advantages such as light weight, high strength, good rigidity and good sound absorption effect. However, with the development of automobile industrial design, the shape of automobiles has become more and more peculiar, and the local cavity of the roof tends to be sharp or steep, which also puts forward higher requirements for the performance of semi-rigid polyurethane foam core materials, including strength and extension. The rate is the two performances that need to be focused on. [0003] Usually, the main materials of the semi-rigid foam of the wet roof are divided into isocyanate component and polyol component, and the isocyanate component accounts for more than 50%, usua...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/79C08G18/72C08G101/00
CPCC08G18/7664C08G18/7671C08G18/797C08G18/725C08G2101/00
Inventor 史旭明
Owner WUXI GISSING AUTO PARTS CO LTD