Polyether polyol for polyurethane foam plastic as well as preparation method and application of polyether polyol

A technology of polyether polyol and foam plastics, applied in the field of modified polyether polyol, can solve the problems of limited application range, poor solvent resistance, poor flame retardancy, etc., and achieve simple preparation process conditions and solvent resistance The effect of improving and relaxing process conditions

Active Publication Date: 2021-12-28
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary polyurethane foam has defects such as poor mechanical properties, poor dimensional stability, easy moisture absorption, poor solvent resistance, and poor flame retardancy. Dimensional shrinkage occurs; when encountering rainy weather, moisture absorption will also occur, which greatly limits its application range
CN1515602A discloses a kind of asphalt polyurethane rigid foam, adopts potassium alkoxide composite catalyst to improve the dimensional stability of the rigid foam, but because the amount of catalyst used in the system is very small, the two main raw materials of polyether and isocyanate have not changed, resulting in The improvement in dimensional stability is very limited
CN102924692A uses epoxy resin blending to modify polyurethane to prepare an epoxy resin-polyurethane interpenetrating network material, but due to the different solubility of epoxy resin and polyurethane, the two phases in the system are separated to a certain extent, and the performance is improved The effect is greatly reduced
CN111269647A uses epoxy resin to chemically modify polyurethane coating to enhance its wear resistance, moisture permeability and oxidation resistance, but its chemical modification principle is very vague, and it has not discussed the mechanical strength and other properties of the modified coating changes in

Method used

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  • Polyether polyol for polyurethane foam plastic as well as preparation method and application of polyether polyol
  • Polyether polyol for polyurethane foam plastic as well as preparation method and application of polyether polyol
  • Polyether polyol for polyurethane foam plastic as well as preparation method and application of polyether polyol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Prepare polyether polyol 1# for polyurethane foam according to the following method:

[0086] Get 169g polyphosphoric acid and dissolve it in 169g dehydrated alcohol to prepare the dehydrated alcohol solution of polyphosphoric acid, then add dropwise to 300g polyether polyol in 3 batches In R2403 (to ensure that the molar ratio of the phosphorus atom of polyphosphoric acid to the hydroxyl group in the polyether polyol raw material is 1:2), the temperature of the reaction system is preheated to between 50-60°C, and the temperature of the system is stabilized at 55°C. Then the temperature was raised to 80° C., and the reaction was carried out for 4 hours. The product was extracted with ethyl acetate (the volume ratio of the extractant to the extracted liquid was 1:1), the organic phase was retained, and then the organic phase was washed with deionized water, extracted and washed 3 times until the aqueous phase was added dropwise to CaCl 2 There is no precipitation in th...

Embodiment 2

[0089] Prepare polyether polyol 2# for polyurethane foam according to the following method:

[0090] Get 169g polyphosphoric acid and dissolve in 135g methylene chloride to prepare the dehydrated alcohol solution of polyphosphoric acid, then add dropwise to 270g polyether polyol in 3 batches In R2403 (to ensure that the molar ratio of the phosphorus atom of polyphosphoric acid to the hydroxyl group in the polyether polyol raw material is 1:1.8), the temperature of the reaction system is preheated to between 50-60°C, and the temperature of the system is stabilized at 50°C. Then the temperature was raised to 75° C., and the reaction was carried out for 6 hours. The product was extracted with ethyl acetate (the volume ratio of the extractant to the extracted liquid was 1:1), the organic phase was retained, and then the organic phase was washed with deionized water, extracted and washed 3 times until the aqueous phase was added dropwise to CaCl 2 There is no precipitation in the...

Embodiment 3

[0093] Prepare polyether polyol 3# for polyurethane foam according to the following method:

[0094] Get 169g polyphosphoric acid and dissolve it in 152g dimethyl carbonate to prepare the absolute ethanol solution of polyphosphoric acid, then add dropwise to 330g polyether polyol in 3 batches In R2403 (to ensure that the molar ratio of the phosphorus atom of polyphosphoric acid to the hydroxyl group in the polyether polyol raw material is 1:2.2), the temperature of the reaction system is preheated to between 50-60°C, and the temperature of the system is stabilized at 60°C. Then the temperature was raised to 85° C., and the reaction was carried out for 2 hours. The product was extracted with ethyl acetate (the volume ratio of the extractant to the extracted liquid was 1:1), the organic phase was retained, and then the organic phase was washed with deionized water, extracted and washed 3 times until the aqueous phase was added dropwise to CaCl 2 There is no precipitation in th...

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Abstract

The invention provides polyether polyol for polyurethane foam plastic as well as a preparation method and application of the polyether polyol. The polyurethane foam plastic prepared on the basis of the polyether polyol obtained by the invention is not only high in compression strength, good in dimensional stability and few in moisture absorption and swelling problems in rainy days, but also excellent in solvent resistance and flame retardant property, and the application requirements of polyurethane spraying can be well met. The preparation method provided by the invention of the polyether polyol for the polyurethane foam plastic comprises the steps of S1, carrying out phosphate esterification modification on the polyether polyol by adopting polyphosphoric acid to generate polyether polyol phosphate, and enabling the polyether polyol phosphate to contain part of hydroxyl groups; and S2, conducting epoxidation modification on the polyether polyol phosphate obtained in the step S1 by adopting epoxy resin, and generating polyether polyol for the polyurethane foam plastic, wherein the molecular structure of the epoxy resin contains benzene rings.

Description

technical field [0001] The invention relates to a modified polyether polyol, in particular to a polyether polyol for polyurethane foam plastics and its preparation method and application. Background technique [0002] Polyurethane is a kind of polymer material containing urethane repeating structural units, which can be made into various products, such as foam plastics, elastomers, adhesives, synthetic leather coating resins, etc. It has a wide range of applications in transportation, medical and other fields. Polyurethane materials have various performance advantages, such as spraying a layer of polyurethane rigid foam on the surface of the inner wall of the cold storage, which has the advantages of thermal insulation, waterproof and energy saving. However, ordinary polyurethane foam has defects such as poor mechanical properties, poor dimensional stability, easy moisture absorption, poor solvent resistance, and poor flame retardancy. Dimensional shrinkage occurs; when en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/50C08G101/00
CPCC08G18/5084C08G2101/00
Inventor 张文清刘赵兴周萌
Owner WANHUA CHEM GRP CO LTD
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