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Polymethylene polyphenyl polyisocyanate composition and preparation method thereof

A technology for polymethylene polyphenyl and polyisocyanate is applied in the field of preparing polymethylene polyphenyl polyisocyanate and can solve the problems of high operating cost, entrainment, complicated maintenance and the like

Active Publication Date: 2020-11-20
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The same DE1107218 and SU1811161 both absorb phosgene in HCl by using different solvents, but the disadvantage is also obvious, part of the solvent will be entrained in the HCl gas flow after absorption
[0012] The published patents DE2143994 and GB737442 have also proposed methods for separating HCl and phosgene by means of condensation, but both require a lower temperature to control the phosgene content in HCl at a lower level, so the operation and equipment costs are relatively high. complicated maintenance
[0013] Although the separation of HCl and phosgene in the above patents also has a certain removal effect on MDI and PI in HCl, especially the method of solvent absorption, there are certain shortcomings, such as high energy consumption, high operating costs, and complicated process flow. Difficult to operate etc.

Method used

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  • Polymethylene polyphenyl polyisocyanate composition and preparation method thereof
  • Polymethylene polyphenyl polyisocyanate composition and preparation method thereof
  • Polymethylene polyphenyl polyisocyanate composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Take 100g of N,N-dimethylformamide, add 100g of polyimide, mix and dissolve completely, add 3g of SiC and 0.3g of Pd nanoparticles to the polyimide solution to obtain a mixed solution, and then use the rotating The coating equipment is evenly coated on the treated ceramic substrate. The ceramic substrate should be polished and cleaned with solvent before use, and dried for later use. Then place the ceramic substrate in the oven, set a gradient heating program, start from room temperature, first raise the temperature to 80°C for 1 hour, then heat up to 300°C after 200 minutes, and hold the temperature for 2 hours, and then place the ceramic substrate Place in boiling water for defilming.

[0079] The obtained polyimide composite carbon film is neatly trimmed and placed in two superimposed quartz sheets, and then placed in a vacuum tube sintering furnace, and nitrogen is introduced into the vacuum tube sintering furnace, and the nitrogen gas is controlled by a gas flow me...

Embodiment 2

[0081] Take 100g of N,N-dimethylformamide, add 100g of polyimide, mix and dissolve completely, add 2g of SiC and 0.1g of Pd nanoparticles to the polyimide solution to obtain a mixed solution, and then use the rotating The coating equipment is evenly coated on the treated ceramic substrate. The ceramic substrate should be polished and cleaned with solvent before use, and dried for later use. Then place the ceramic substrate in the oven, set a gradient heating program, start from room temperature, first raise the temperature to 60°C for 2 hours, then heat up to 250°C after 150 minutes, and keep the temperature for 3 hours, and then place the ceramic substrate Place in boiling water for defilming.

[0082] The obtained polyimide composite carbon film is neatly trimmed and placed in two superimposed quartz sheets, and then placed in a vacuum tube sintering furnace, and nitrogen is introduced into the vacuum tube sintering furnace, and the nitrogen gas is controlled by a gas flow m...

Embodiment 3

[0087] use figure 1 As shown in the process flow, the prepared reaction solution is fed to the bottom of the dephosphorization tower A, and heat-treated at normal pressure and 140°C for 1 hour, and the phosgene content in the treated reaction solution 2 is reduced to below 100ppm . Then, the dephosgenated reaction solution 2 is sent to the top of the HCl stripping column B. The overhead gas stream 3 of the dephosphorization tower A mainly contains phosgene, HCl and solvent.

[0088] The HCl gas stream 4 that will contain the material 10000ppm that influences phosgene adduct content is sent into membrane separation device C, HCl gas stream pressure 3bar (gauge pressure), the membrane separation unit of selection contains 3 separation pieces, adopts the gained in the preparation in the embodiment 1 Polyimide composite carbon membrane, after three-stage membrane separation, the purified HCl gas flow 7 enters the gas-liquid separation tank D1, and the gas phase 8 above the gas-l...

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PUM

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Abstract

The invention provides a polymethylene polyphenyl polyisocyanate composition and a preparation method thereof. An HCl steam stripping process is adopted in the preparation process; by controlling thecontent of impurities (including COCl2, PI (phenyl isocyanate), MDI (diphenyl methane diisocyanate) and other substances potentially influencing the content of phosgene adducts) in HCl; the phosgene adduct content in the reaction solution after HCl steam stripping can be effectively controlled, and the curing rate of the polymethylene polyphenyl polyisocyanate composition in the production processand the compression strength of the foam, which is obtained by foaming between the composition and polyether, are improved. The HCl steam stripping process is simple, low in operation cost and convenient to operate, and has certain effects of improving the production efficiency and the application performance of the products.

Description

technical field [0001] The invention belongs to the field of isocyanate production, and relates to a method for preparing polymethylene polyphenyl polyisocyanate (methylene crosslinked polyphenylmethane polyisocyanate). Background technique [0002] Polymethylene polyphenyl polyisocyanate is mainly used in the production of polyurethane rigid foam, mainly used in home appliances, and other cold storage, containers, building insulation materials, etc. In the existing poly-MDI application process, the mechanical properties of the foam after foaming are poor, especially the compressive strength of the hard foam is low, which cannot meet the use requirements. [0003] The production of polymethylene polyphenyl polyisocyanates is well known in the art. The main industrial preparation method is: condensing aniline and formaldehyde in the presence of a solvent to form a polyamine mixture, which is further reacted with phosgene to form a polyisocyanate mixture, and then the solvent...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/78C08G18/48B01D67/00B01D71/02B01D69/02B01D69/12B01D53/22C08G101/00
CPCC08G18/7664C08G18/7812C08G18/725C08G18/48B01D71/021B01D71/022B01D71/02B01D69/02B01D69/12B01D67/0039B01D67/0067B01D53/228C08G2101/00
Inventor 黄荐文放赵东科张宏科吴雪峰
Owner WANHUA CHEM GRP CO LTD
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