Process for preparing polyurea polyol

A technology of polyurea polyol and polyether polyol, which is applied in the field of polyurethane foam, can solve the problems of low investment, large investment in continuous process equipment, high viscosity, etc., and achieve low product viscosity, high load-carrying capacity, and good flame retardancy. Effect

Inactive Publication Date: 2003-10-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the generation of a large number of urea bonds during the synthesis of polyurea polyols, it is easy to aggregate to form large particles, and it is easy to form hydrogen bond compounds with small molecules of water, which affects the viscosity and stability of the system and inhibits its development. In the reported patent And in the literature, the equipment investment of laboratory dripping method is less, but the polyurea polyol solid content of preparation is generally 10%, and viscosity is above 10000mPa s / 25 ℃ (German patent 1,260,142), and viscosity is too high; The solid content is generally 20%. U.S. Patent No. 4,089,835 discloses the continuous production of polyurea polyols with a solid content of 10%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 360g polyether polyol (domestic 330N) and 11.1g hydrazine hydrate (80% hydrazine hydrate content) to a four-necked flask equipped with a thermometer, condensing reflux pipe, nitrogen conduit, dropping funnel and mechanical stirring, and replace with nitrogen Air in the bottle for 10 minutes, then close the system, and stir the premixed base material at high speed for 10 minutes. And under vigorous stirring, 34.3g TDI (80 / 20) was gradually added dropwise into the polyol / polyamine system. Control the temperature at about 40±2°C, continue to react for 0.5 to 1 hour after adding the isocyanate, and then vacuumize for 2.5 to 3 hours at a temperature lower than -0.095MPa and 120±5°C to remove water and residual monomers. body, the milky white polyurea polyol product with a solid content of 10%, a viscosity of 8300mPa·s / 25°C and relatively coarse particles can be obtained.

Embodiment 2

[0017] Add 360g polyether polyol (domestic 330N), 11.1g hydrazine hydrate (hydrazine hydrate content is 80%) and 10g toluene ( Analytical purity), replace the air in the bottle with nitrogen for 10 minutes, then close the system, and stir the premixed bottom material at high speed for 10 minutes. And under vigorous stirring, 34.3g TDI (80 / 20) was gradually added dropwise into the polyol / polyamine / solvent system. Control the temperature at around 40±2°C, continue to react for 0.5 to 1 hour after adding the isocyanate, and then vacuumize for 2.5 to 3 hours at a temperature lower than -0.095MPa and 120±5°C to remove solvent, water and Residual monomers can be obtained as a milky white polyurea polyol product with a solid content of 10%, a viscosity of 5850mPa·s / 25°C, and uniform particle dispersion.

Embodiment 3

[0019] Add 340g polyether polyol (domestic 330N), 16.8g hydrazine hydrate (hydrazine hydrate content is 80%) and 15g toluene ( Analytical purity), replace the air in the bottle with nitrogen for 10 minutes, then close the system, and stir the premixed bottom material at high speed for 10 minutes. And under vigorous stirring, 51.4g of TDI (80 / 20) was gradually added dropwise into the polyol / polyamine / solvent system. Control the temperature at around 40±2°C, continue to react for 0.5 to 1 hour after adding the isocyanate, and then vacuumize for 2.5 to 3 hours at a temperature lower than -0.095MPa and 120±5°C to remove solvent, water and Residual monomers can be obtained as a milky white polyurea polyol product with a solid content of 15%, a viscosity of 11500mPa·s / 25°C, and uniform particle dispersion.

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Abstract

A polyurea polyol is prepared through mixing polyether polyol, polyamine and solvent, stirring while adding aliphatic or aromatic polyisocyanate or the mixture of said polyisocyanate and polyol, reaction, and vacuum separation. Its advantages are high dispersity and good granular shape. The foam polyurethane plastics made of it has high load-bearing power and better flame-retarding nature.

Description

(1) Technical field [0001] The invention relates to the field of polyurethane foam plastics, in particular to a preparation method of polyurea polyol. (2) Background technology [0002] Since the industrialization of polyurethane, due to its many advantages, it has developed extremely rapidly, and as an important component of polyurethane, polyol has also developed rapidly, and new varieties have emerged continuously, which are used in different fields. Polyurethane foams are prepared by reacting polyols and polyisocyanates in the presence of various additives. Polyols used for foams are usually made of active hydrogen-containing initiators and oxyalkylene compound monomers under the action of ion catalysts. The polyol molecular weight obtained is generally between 500 and 8000, and the functional group is between 2 and 5. In order to improve the load-carrying properties and flame retardancy of foams, polyols need to be modified, and filling modification is one of the main ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/325
Inventor 修玉英郑旭生
Owner SOUTH CHINA UNIV OF TECH
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