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A kind of modified MDI, polyurethane foam and preparation method thereof

A modified, isocyanate technology, applied in the field of modified MDI, polyurethane foam and its preparation, can solve the problems of poor heat resistance of polyurethane rigid foam, and achieve the effect of improving heat resistance

Active Publication Date: 2019-06-25
SHANGHAI DONGDA POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of poor heat resistance of rigid polyurethane foam in the prior art, and provides a modified MDI, polyurethane foam and a preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment provides a kind of modified MDI, and the raw material of described modified MDI comprises the following components in parts by weight: 2541 parts of PM-200, 96 parts (2.5mol) of trimellitic anhydride, 850 parts of (0.5mol) ethyl Diol diglycidyl ether.

[0042] The preparation method of the modified MDI comprises the following steps: take PM-200 and place it in a three-necked flask, heat it to 140°C, stir at a speed of 4000-5000r / min, and then divide the trimellitic anhydride into 5 times successively, and ethylene glycol dishrinks Glyceryl ether was added into the three-necked flask five times, and after reacting for 1 hour, the -NCO content was measured. When the -NCO content was 15%, the reaction was stopped to obtain the modified MDI.

[0043] This embodiment also provides a high temperature-resistant rigid polyurethane foam, the preparation method of which includes the following steps: mix the combined polyether and the modified MDI prepared b...

Embodiment 2

[0047]This embodiment provides a kind of modified MDI, the raw material of described modified MDI comprises the following components by weight parts: 2610 parts of PM-200, 192 parts (1mol) trimellitic anhydride, 340 parts (1mol) bisphenol A diglycidyl ether.

[0048] The preparation method of the modified MDI includes the following steps: take PM-200 and place it in a three-necked flask, heat it to 140°C, stir at a speed of 4000-5000r / min, and then divide the trimellitic anhydride into 3 times successively, bisphenol A dishrinks Glyceryl ether was added into the three-necked flask three times. After reacting for 1 hour, the -NCO content was measured. When the -NCO content was 20%, the reaction was stopped to obtain the modified MDI.

[0049] This embodiment also provides a high temperature-resistant rigid polyurethane foam, the preparation method of which includes the following steps: mixing the combined polyether and the modified MDI prepared by the above method according to ...

Embodiment 3

[0053] This embodiment provides a kind of modified MDI, the raw material of described modified MDI comprises the following components by weight: 7536 parts of PM-200, 480 parts (2.5mol) trimellitic anhydride, 170 parts (0.5mol) bis Phenol A diglycidyl ether.

[0054] The preparation method of the modified MDI includes the following steps: take PM-200 and place it in a three-necked flask, heat it to 140°C, stir at a speed of 4000-5000r / min, and then divide the trimellitic anhydride into 8 times successively, and bisphenol A dishrinks Glyceryl ether was added into the three-necked flask in 8 times. After reacting for 1 hour, the -NCO content was measured. When the -NCO content was 25%, the reaction was stopped to obtain the modified MDI.

[0055] This embodiment also provides a high temperature-resistant rigid polyurethane foam, the preparation method of which includes the following steps: mixing the combined polyether and the modified MDI prepared by the above method according ...

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Abstract

The invention discloses modified MDI (Methane Diphenyl Diisocyanate), polyurethane foam and preparation methods of the modified MDI and the polyurethane foam. The preparation method of the modified MDI comprises the following steps: after heating isocyanate to certain temperature, sequentially adding anhydride and epoxide, and reacting until the content of -NCO meets the requirement. The preparation method of the polyurethane foam using the modified MDI comprises the following step: curing premixed polyether and the modified MDI for a certain time after uniformly mixing the premixed polyether with the modified MDI. According to the preparation methods disclosed by the invention, by introducing the structures of polyimide and oxazolidinone to the isocyanate, the heat resistance of rigid polyurethane foam which is finally prepared is greatly increased, and an obtained rigid polyurethane foam product can be used for a long time in a 200-DEG environment, and has a wide application prospect.

Description

technical field [0001] The invention relates to a modified MDI, polyurethane foam and a preparation method thereof. Background technique [0002] Polyurethane rigid foam is a kind of organic insulation material that has been widely used in recent years. It is light in weight, heat-insulating and heat-preserving, but its disadvantages are poor heat resistance, easy combustion, easy aging, poor fire safety, and it will A large amount of toxic gas and smoke are released, which poses a serious threat to production safety. [0003] In the prior art, the operating temperature range of ordinary polyurethane rigid foam is generally below 120°C. When the temperature exceeds 120°C, the carbamate and other structures in the foam structure will decompose; and if it is used for a long time above 80°C, then Serious performance degradation will occur. Although the modified polyisocyanurate rigid foam has improved heat resistance, it will decompose above 150°C. In some fields that requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/80C08G18/48
CPCC08G18/4816C08G18/80C08G2110/0025C08G2110/0083
Inventor 冯文君王光辉信延垒任丽
Owner SHANGHAI DONGDA POLYURETHANE