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Polyurethane prepolymer, preparation method thereof and polyurethane product

A polyurethane prepolymer and diisocyanate technology, which is applied in the field of polymer material preparation, can solve the problem of high content of free diphenylmethane diisocyanate, and achieve the effects of excellent environmental protection performance, clear process, and prevention of cost increase and deterioration risk.

Active Publication Date: 2022-03-18
JIHUA LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to propose a polyurethane prepolymer and its preparation method, and polyurethane products, aiming to solve the problem of high content of free diphenylmethane diisocyanate in high-viscosity polyurethane prepolymers

Method used

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  • Polyurethane prepolymer, preparation method thereof and polyurethane product
  • Polyurethane prepolymer, preparation method thereof and polyurethane product
  • Polyurethane prepolymer, preparation method thereof and polyurethane product

Examples

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Effect test

preparation example Construction

[0035] Please refer to figure 1 , the preparation method of low free diphenylmethane diisocyanate polyurethane prepolymer comprises the following steps:

[0036] Step S10, dissolving diphenylmethane diisocyanate in the compounding solvent, adding anhydrous polyol, layering after reaction, and removing the lower layer to obtain a high-free diphenylmethane diisocyanate polyurethane prepolymer.

[0037] It should be noted that diphenylmethane diisocyanate, the molecular formula is C 15 h 10 N 2 o 2 , molecular weight 250.25, including 4,4'-MDI, 2,4'-MDI and 2,2'-MDI three isomers, of which 4,4'-MDI has the most content.

[0038] The dehydrated polyols include long-chain polyester polyols or long-chain polyether polyols, long-chain polyester polyols include conventional polyester polyols, polycaprolactone polyols or polycarbonate diols, conventional polyester polyols Alcohols are mainly composed of polyhydric alcohols including ethylene glycol, diethylene glycol, 1,2-propylen...

Embodiment 1

[0062] (1) Add dehydrated polyol dropwise to the compound solvent in which diphenylmethane diisocyanate is dissolved at 100°C under stirring condition for 2.5 hours, and continue stirring after dropping until no more deposits are added , Remove the layer to get high free diphenylmethane diisocyanate polyurethane prepolymer.

[0063] (2) Collect the upper layer solution in step (1), and distill and separate the upper layer solution to obtain the compound solvent and diphenylmethane diisocyanate, and the distillation temperature is 85°C.

[0064] (3) At 60°C, inject the high free diphenylmethane diisocyanate polyurethane prepolymer into the tower from the top of the extraction tower, inject the compound solvent into the tower from the bottom of the extraction tower, stir and mix, and remove the extracted liquid to obtain a mixture, and the mixture is distilled and separated to obtain a low-free diphenylmethane diisocyanate polyurethane prepolymer and a compound solvent respectiv...

Embodiment 2

[0068] (1) Add dehydrated polyol dropwise to the compound solvent in which diphenylmethane diisocyanate is dissolved at 60°C under stirring conditions for 3 hours, and continue stirring after dropping until no more deposits are added. Take off the layer to get high free diphenylmethane diisocyanate polyurethane prepolymer.

[0069] (2) Collect the upper layer solution in step (1), and distill and separate the upper layer solution to obtain the compound solvent and diphenylmethane diisocyanate, and the distillation temperature is 80°C.

[0070] (3) At 100°C, inject the high free diphenylmethane diisocyanate polyurethane prepolymer into the tower from the top of the extraction tower, inject the compound solvent into the tower from the bottom of the extraction tower, stir and mix, and remove the extracted liquid to obtain a mixture, and the mixture is distilled and separated to obtain a low-free diphenylmethane diisocyanate polyurethane prepolymer and a compound solvent respectiv...

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Abstract

The invention discloses a polyurethane prepolymer, a preparation method thereof and a polyurethane product, and the preparation method of the polyurethane prepolymer comprises the following steps: dissolving diphenylmethane diisocyanate in a compound solvent, then adding dehydrated polyol, layering after reaction, and taking the lower layer to obtain a high free diphenylmethane diisocyanate polyurethane prepolymer; and extracting the high-free diphenylmethane diisocyanate polyurethane prepolymer by using a compound solvent, then removing extract liquor to obtain a mixture, and distilling and separating the mixture to respectively obtain a low-free diphenylmethane diisocyanate polyurethane prepolymer and the compound solvent. The low-free diphenylmethane diisocyanate polyurethane prepolymer obtained by the invention is low in content of the free diphenylmethane diisocyanate, the content of the free diphenylmethane diisocyanate is 0.01-1wt%, the risks of cost increase and deterioration caused by storage and transfer of the polyurethane prepolymer are effectively prevented, and the low-free diphenylmethane diisocyanate polyurethane prepolymer is excellent in environmental protection performance and has an application prospect of continuous production.

Description

technical field [0001] The invention relates to the technical field of polymer material preparation, in particular to a polyurethane prepolymer, a preparation method thereof, and a polyurethane product. Background technique [0002] Polyurethane products usually exist in the form of foam plastics, elastomers, coatings, adhesives, fibers, synthetic leather, waterproof materials, etc., and are widely used in transportation, construction, machinery, water conservancy, national defense, medical and other fields. Polyurethane products are produced by the reaction of polyurethane prepolymers with curing agents or chain extenders, and polyurethane prepolymers are the key components. The preparation method of existing polyurethane prepolymer adopts stoichiometric excess of diisocyanate to react with oligomer polyols such as polyester or polyether, and the polyurethane prepolymer prepared in this way inevitably contains more free diisocyanate. isocyanate. [0003] At present, in or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42C08G18/10C08G18/08
CPCC08G18/4277C08G18/10C08G18/0842
Inventor 徐婷杨文刚邓明虓
Owner JIHUA LAB
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