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

Room temperature curing cyclocarbonate prepolymers and preparation method and application thereof

A cyclocarbonate, room temperature curing technology, applied in the field of non-isocyanate polyurethane, can solve the problems of unfavorable use of non-isocyanate polyurethane, no room temperature curing of cyclocarbonate and amine, and achieve simple method, superior physical properties, and reduce energy loss. Effect

Inactive Publication Date: 2018-03-02
SOUTH CHINA UNIV OF TECH +1
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high temperature curing is not conducive to the application of non-isocyanate polyurethane
At present, there are no relevant literature and patent reports on the room temperature curing of cyclocarbonate and amine without any catalyst.

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Room temperature curing cyclocarbonate prepolymers and preparation method and application thereof
  • Room temperature curing cyclocarbonate prepolymers and preparation method and application thereof
  • Room temperature curing cyclocarbonate prepolymers and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Preparation of cyclocarbonate compound: Epoxy resin E-51 and tetrabutylammonium bromide (addition amount is 0.5% of epoxy resin quality) are added in the autoclave, feed carbon dioxide (pressure maintains at 0.6 MPa) was reacted at 150°C for 4 hours, cooled down and released to obtain cyclic carbonate compound EC-51.

[0032] (2) Preparation of cyclocarbonate prepolymer EC-51-1: Add cyclocarbonate EC-51 and DMF (addition amount is 100% of EC-51) in the reaction kettle and stir to dissolve, then add isophorone Diamine, stirred and heated to 80°C for 8 hours, cooled and discharged for storage;

[0033] formula:

[0034] Table 1

[0035]

[0036] EC-51-1 prepolymer: brown liquid; solid content: 50%, viscosity: 20mPa·s;

[0037] (3) Preparation of non-isocyanate polyurethane coating (NIPU-1): cyclocarbonate prepolymer EC-51-1, polyethyleneimine (PEI-400) curing agent, defoaming agent are sprayed after stirring evenly at room temperature , solidified at room tempe...

Embodiment 2

[0048] (1) Preparation of cyclocarbonate compound: adding epoxy resin E-12, adding epoxy resin mass fraction is 100% DMF solvent, lithium chloride (addition is epoxy resin quality 1.0%) is added to autoclave Inside, maintain the temperature of 0.8MPa by feeding carbon dioxide and react at 150°C for 24h, cool down and release the pressure, and obtain the cyclocarbonate compound EC-12.

[0049] (2) Preparation of cyclocarbonate prepolymer EC-12-1: Add cyclocarbonate EC-12 and 1-ethyl-2-pyrrolidone (NEP) in the reaction kettle (addition amount is 80% of EC-12) Stir to dissolve, then add butanediamine, stir and heat up to 130°C for 2 hours, cool down and discharge for storage;

[0050] formula:

[0051] Table 4

[0052]

[0053] EC-12-1 prepolymer: brown liquid; solid content: 60%, viscosity: 100mPa·s;

[0054] (3) Preparation of non-isocyanate polyurethane coating (NIPU-2): cyclocarbonate prepolymer EC-12, polyethyleneimine (1000) curing agent and defoamer were sprayed afte...

Embodiment 3

[0062] (1) Preparation of cyclocarbonate compound: Epoxy resin E-20, adding epoxy resin mass fraction is 50% DMF solvent, and lithium bromide (addition is epoxy resin quality 1.5%) is added in the autoclave , feed carbon dioxide to maintain the reaction at 130°C for 24h at 1MPa, cool down and release the pressure, and obtain the cyclocarbonate compound EC-20.

[0063] (2) Preparation of cyclocarbonate prepolymer EC-20-1: Add cyclocarbonate EC-20 and dimethyl sulfoxide (DMSO) (addition amount is 125% of EC-20) in the reaction kettle and stir to dissolve, Then add hexamethylenediamine, stir and raise the temperature to 130°C for 2 hours, then cool down and discharge for storage;

[0064] formula:

[0065] Table 7

[0066]

[0067] EC-20-1 prepolymer: brown liquid; solid content: 40%, viscosity: 50mPa·s;

[0068] (3) Preparation of non-isocyanate polyurethane coating (NIPU-3): cyclocarbonate prepolymer EC-20-1, polyethyleneimine (2000) curing agent and defoamer were sprayed...

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

PropertyMeasurementUnit
viscosityaaaaaaaaaa
hardnessaaaaaaaaaa
viscosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses room temperature curing cyclocarbonate prepolymers and a preparation method and an application thereof. According to the preparation method, two-membered cyclocarbonate is synthesized with epoxy resin and a catalyst as raw materials in a CO2 atmosphere, furthermore, cyclocarbonate prepolymers with different molecular weight are synthesized from the two-membered cyclocarbonate and diamine, and then a high-performance non-isocyanate polyurethane coating layer is synthesized from the cyclocarbonate prepolymers and a polyethyleneimine curing agent at room temperature. The prepared cyclocarbonate prepolymers are yellow transparent liquids, are nontoxic and have relatively good biodegradability. The prepared non-isocyanate polyurethane coating layer has high hardness andexcellent impact resistance and chemical resistance, and is expected to become a green environmentally friendly excellent-performance coating instead of traditional polyurethane.

Description

technical field [0001] The invention relates to a non-isocyanate polyurethane (NIPU), in particular to a room temperature curing cyclic carbonate prepolymer and its preparation method and application. Background technique [0002] Polyurethane (PU) has excellent physical and chemical properties and can be used to make plastics, foams, elastomers, leather, adhesives, sealants, coatings, etc. and used in buildings, electronic products, aircraft, cruise ships, furniture and other fields. Traditional polyurethane is polymerized from polyols and polyisocyanates, among which polyisocyanate is a highly toxic substance that is very harmful to the human body. For example, diisocyanate is synthesized by the toxic phosgene method, which is toxic, harmful and dangerous. The pollution of the environment is relatively large, which does not meet the development requirements of safety and environmental protection. At the same time, water can react with isocyanate groups to affect the stor...

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 Applications(China)
IPC IPC(8): C08G71/04C09D175/04C09D5/08
CPCC08G71/04C09D5/08C09D175/04
Inventor 瞿金清吴志军邓凯伦陈荣华
Owner SOUTH CHINA UNIV OF TECH