Internal crosslinking polypropylene carbonate waterborne polyurethane emulsion and preparation method and application thereof

A polypropylene carbonate and water-based polyurethane technology, applied in the field of water-based polyurethane, can solve the problems of poor emulsification effect and uneven distribution of ion groups, and achieve the effects of good emulsification effect, good transparency and improved addition steps.

Inactive Publication Date: 2013-11-27
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the application number 201010565904.0 discloses a water-based polyurethane coating with polypropylene carbonate polyol as raw material and its preparation method. In this preparation m

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Each component was operated according to the following steps: 60 parts by mass of polypropylene carbonate polyol and 30 parts by mass of IPDI were added into a three-necked flask equipped with an electric stirring device and mixed, the temperature was raised to 60° C., and 0.5 parts by mass of DBTDL was added. Gradually raise the temperature to 90° C., keep the reaction for 2 hours, then add 5.5 parts by mass of DMPA, and add a small amount of acetone to dilute, and keep the reaction for 3 hours. The temperature is lowered to 60°C, 3.5 parts by mass of diethylene glycol is added, reacted for 2 hours, and 80-100 parts by mass of acetone is added to adjust the viscosity to prevent gel formation due to excessive viscosity. When the temperature drops to 35-45°C, add 3.5 parts by mass of triethylamine for neutralization reaction for 0.5 hours, add 250 parts by mass of deionized water to emulsify, stir at high speed for 1 hour, and evaporate the acetone to obtain an internally...

Embodiment 2

[0028] Each component was operated according to the following steps: 60 parts by mass of polypropylene carbonate polyol and 30 parts by mass of IPDI were added into a three-necked flask equipped with an electric stirring device and mixed, the temperature was raised to 60° C., and 0.5 parts by mass of DBTDL was added. Gradually raise the temperature to 90° C., keep the reaction for 2 hours, then add 6 parts by mass of DMPA, and add a small amount of acetone to dilute, and keep the reaction for 3 hours. The temperature is lowered to 60°C, 3 parts by mass of ethylene glycol is added, and reacted for 2 hours, and 80-100 parts by mass of acetone is added to adjust the viscosity to prevent gel formation due to excessive viscosity. When the temperature drops to 35-45°C, add 3.7 parts by mass of triethylamine for neutralization reaction for 0.5 hours, add 250 parts by mass of deionized water to emulsify, stir at high speed for 1 hour, and evaporate the acetone to obtain an internally c...

Embodiment 3

[0031] Each component was operated according to the following steps: 60 parts by mass of polypropylene carbonate polyol and 30 parts by mass of IPDI were added into a three-necked flask equipped with an electric stirring device and mixed, the temperature was raised to 60° C., and 0.5 parts by mass of DBTDL was added. Gradually raise the temperature to 90° C., keep the reaction for 2 hours, then add 6 parts by mass of DMPA, and add a small amount of acetone to dilute, and keep the reaction for 3 hours. The temperature is lowered to 60°C, 3 parts by mass of 1,4-butanediol is added, reacted for 2 hours, and 80-100 parts by mass of acetone is added to adjust the viscosity to prevent gel formation due to excessive viscosity. When the temperature drops to 35-45°C, add 3.7 parts by mass of triethylamine for neutralization reaction for 0.5 hours, add 250 parts by mass of deionized water to emulsify, stir at high speed for 1 hour, and evaporate the acetone to obtain an internally crossl...

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Abstract

The invention belongs to the field of waterborne polyurethane and discloses an internal crosslinking polypropylene carbonate waterborne polyurethane emulsion and a preparation method and application thereof. The preparation steps are as follows: mixing polypropylene carbonate polyols and diisocyanate, increasing the temperature to 60 DEG C, adding a catalyst, increasing the temperature to 80-90 DEG C gradually, and performing thermal reaction for 2-3 h; adding a hydrophilic chain extender and performing thermal reaction; cooling to 60 DEG C, adding a crosslinking agent and performing reaction for 1-2 h; adding a proper amount of acetone to adjust viscosity; when the temperature is reduced to 35-45 DEG C, adding a neutralizer for reaction for 0.5-1 h; adding deionized water for emulsification, stirring for 0.5-1 h at a high speed; evaporating acetone to obtain the internal crosslinking polypropylene carbonate waterborne polyurethane emulsion. The internal crosslinking polypropylene carbonate waterborne polyurethane emulsion has superior cohesiveness and can be used as water paint and adhesive, an emulsion membrane prepared from the internal crosslinking polypropylene carbonate waterborne polyurethane emulsion has good transparency and high tearing strength.

Description

technical field [0001] The invention belongs to the field of water-based polyurethane, in particular to an internal cross-linked polypropylene carbonate water-based polyurethane emulsion and a preparation method and application thereof. Background technique [0002] Polypropylene carbonate polyol (PPC) is made of CO 2 A new type of aliphatic polycarbonate polyol resin, which is copolymerized with propylene oxide (PO), has abundant sources of synthetic raw materials and low price, and is of great significance to the comprehensive utilization of carbon dioxide. The content of carbonate structural units in PPC is relatively high, and the mole fraction is between 25% and 50%. The catalyst used in the reaction is cheap, the reaction operation is simple, and the reaction energy consumption is also low. If it is produced on a large scale, the production cost of PPC can be greatly reduced. PPC is a polymer with hydroxyl groups at both ends of the molecule. It is the raw material f...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/44C08G18/34C08G18/32C09D175/04C09J175/04
Inventor 王斌刘化珍刘伟区区菊花杨永严杰
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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