Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing polyurethane emulsion for stripping paint

A polyurethane emulsion and coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as environmental pollution and health threats to field operators, and achieve the effects of environmental protection, wide application range and low cost.

Active Publication Date: 2012-07-04
SHANGHAI WEIKAI CHEM
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solvent-based polyurethane resin, because it contains a large amount of organic solvents, will not only cause environmental pollution but also pose a threat to the health of on-site operators when processed in downstream industries

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 20g of polycaprolactone polyol (PCL) with a molecular weight of 2000 was placed in a three-necked flask equipped with a stirrer, a reflux condenser, and a thermometer, and was vacuum dehydrated at 110°C for 2h, and 15g of diphenylmethane diisocyanate (MDI) was added. Control the temperature at 60°C for 1.5h; add 2.4g of dimethylolpropionic acid (DMPA) for 2h, then add 3g of butanediol (BDO) to continue the reaction for 3h; lower the temperature below 40°C, add 1.8g to neutralize After being neutralized with triethylamine (TEA) for 1 hour, 100 g of deionized water was added, and the stirring speed was controlled to be 3000 rpm for shear emulsification for 1 hour. The solvent was removed under vacuum to obtain a polyurethane aqueous emulsion with a solid content of 30%.

Embodiment 2

[0023] Put 20g of polyhexamethylene adipate (PHA) with a molecular weight of 2000 in a three-neck flask equipped with a stirrer, a reflux condenser, and a thermometer, and vacuum dehydrate it at 110°C for 2 hours, and add 17.4g of toluene diisocyanate (TDI) , control the temperature at 70°C for 2.5h; lower the temperature to 60°C, add 4.7g of dimethylolpropionic acid (DMPA) for 2h, then add 2.4g of butanediol (BDO) to continue the reaction for 2h, then add 0.6g Trimethylolpropane (TMP), react for 2 hours; lower the temperature to below 40°C, add 3.5g of neutralizing agent TEA to neutralize for 1 hour, then discharge, add 130g of deionized water, control the stirring speed to 3000rpm and shear emulsify for 1 hour, The solvent was removed under vacuum to obtain a polyurethane water emulsion with a solid content of 30%.

Embodiment 3

[0025] 20g of polybutylene adipate (PHA) with a molecular weight of 2000 was placed in a three-necked flask equipped with a stirrer, a reflux condenser, and a thermometer, and was vacuum dehydrated at 110°C for 2h, and 22.3g of IPDI was added, and the temperature was controlled at 85 ℃ reaction for 2.5h; lower the temperature to 60℃, add 5.2g DMPA to react for 2h, then add 1.4gBDO to continue the reaction for 2h, then add 0.9g TMP, react for 2h; lower the temperature to below 40℃, add 3.9g neutralizer After TEA was neutralized for 1 hour, it was discharged, 140 g of deionized water was added, the stirring speed was controlled to 3000 rpm for 1 hour of shear emulsification, and the solvent was removed under vacuum to obtain a polyurethane aqueous emulsion with a solid content of 30%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for preparing polyurethane emulsion for stripping paint, comprising the steps of: vacuum dewatering macromolecular polyatomic alcohol, and then adding diisocyanate for reaction to obtain small molecular prepolymer; after that, adding hydrophilic chain extender for chain extension and small molecular chain extension reaction, and obtaining macromolecular resin; after cooling, adding neutralizing agent for neutralization; then, adding deionized water for shear emulsification; and finally, removing solvent by vacuum decompression, and obtaining the polyurethane emulsion. Compared with the prior art, the method has simple process flow and lower cost, and the prepared polyurethane emulsion is applicable to the PET film stripping paint, so that the material is more environment-friendly, and the application scope is wider.

Description

technical field [0001] The invention relates to a preparation method of polyurethane emulsion, in particular to a preparation method of polyurethane emulsion for stripping paint. Background technique [0002] Polyurethane resin is widely used in various fields because of its excellent performance. Solvent-based polyurethane resin, because it contains a large amount of organic solvents, will not only cause environmental pollution but also pose a threat to the health of on-site operators when processed in downstream industries. [0003] As countries around the world are increasingly concerned about environmental protection and related pollution prevention and control regulations are becoming increasingly stringent, the PU resin industry has undergone revolutionary changes in the past few years, that is, the original high-pollution solvent-based PU resin has been transformed into low-pollution water-based PU resin. resin. In recent years, the application and development of wa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/10C08G18/76C08G18/73C09D5/20C09D175/04C09D175/06
Inventor 邓庆仪刘杰戴炜枫朱先义
Owner SHANGHAI WEIKAI CHEM