Method for preparing isocyanate thermoplastic polyurea by using one-pot method

A non-isocyanate, thermoplastic polyurea technology, applied in the field of polyurethane, can solve problems such as cumbersome process, achieve the effects of good mechanical properties, convenient and efficient preparation process, and convenient continuous production

Active Publication Date: 2017-11-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method needs to synthesize and purify diurethane diol in advance, and the process is relatively cumbersome

Method used

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  • Method for preparing isocyanate thermoplastic polyurea by using one-pot method
  • Method for preparing isocyanate thermoplastic polyurea by using one-pot method
  • Method for preparing isocyanate thermoplastic polyurea by using one-pot method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 23 parts of D230 and 8.8 parts of ethylene carbonate according to parts by weight, react at 100°C under normal pressure for 6 hours under the protection of nitrogen, then heat at normal pressure to 170°C, gradually depressurize the water pump to 30mmHg and react for 0.5 hours, and then use the oil pump to Reaction under reduced pressure at 2-3 mmHg until the viscosity of the system no longer changes, and a light yellow transparent thermoplastic polyurea with Mn=10417, Mw=14261, tensile strength of 1.79 MPa and elongation at break of 1330.12% is obtained.

Embodiment 2

[0026] Weigh 13.8 parts of D230, 4.65 parts of hexamethylenediamine, and 8.8 parts of ethylene carbonate in parts by weight, and react at 100°C under normal pressure for 6 hours under the protection of nitrogen, then heat to 170°C under normal pressure, and gradually reduce the pressure to 30mmHg for reaction After 0.5 hours, use an oil pump to react under reduced pressure at 2 to 3 mmHg until the viscosity of the system does not change any more, and obtain a light yellow transparent thermoplastic polyurea, [η] = 0.83dL / g, tensile strength 16.17MPa, elongation at break The rate is 314.74%.

Embodiment 3

[0028] Weigh 16.1 parts of D230, 4.09 parts of m-xylylenediamine, and 8.8 parts of ethylene carbonate in parts by weight, react at 100°C under normal pressure for 6 hours under the protection of nitrogen, then heat to 170°C under normal pressure, and gradually depressurize to React at 30mmHg for 0.5 hours, and then use an oil pump to react under reduced pressure at 2 to 3mmHg until the viscosity of the system no longer changes, and obtain a light yellow opaque thermoplastic polyurea with Mn=11244, Mw=19754, tensile strength 21.86MPa, fracture Elongation 284.13%.

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Abstract

The invention discloses a method for preparing isocyanate thermoplastic polyurea by using a one-pot method, and belongs to the technical field of polyurethane. The method comprises the following steps: performing an in-situ esterification reaction on diamine and cyclic carbonate, and further performing melting polycondensation, thereby obtaining irregular or crystallized isocyanate thermoplastic polyurea. The method is simple and convenient to operate, efficient, green and environment-friendly and applicable to continuous industrial production, and the obtained irregular and crystallizable polyurea is good in mechanical property.

Description

technical field [0001] The invention relates to a method for preparing non-isocyanate thermoplastic polyurea by adopting a one-pot method. Using diamines such as polyetheramine D230, hexamethylenediamine, m-xylylenediamine, and polyetheramine B220 as raw materials, first carry out in-situ urethane reaction with cyclocarbonate, and then undergo melt polycondensation to prepare amorphous or crystalline The non-isocyanate thermoplastic polyurea belongs to the technical field of polyurethane. technical background [0002] Polyurea is one of the important varieties of polyurethane. It is widely used in daily life and has excellent properties such as good strength, toughness, wear resistance, and corrosion resistance. At present, polyurea is mainly synthesized by polyisocyanate and diamine, and isocyanate is toxic, harmful to the environment and human body, and its preparation raw material is highly toxic phosgene; at the same time, isocyanate can react with water or moisture to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G71/02
CPCC08G71/02
Inventor 赵京波班家龙张军营杨万泰
Owner BEIJING UNIV OF CHEM TECH
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