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

A kind of method utilizing composite catalyst to prepare pla and its copolymer

A composite catalyst and copolymer technology, which is applied in the field of preparing PLA and its copolymers by using composite catalysts, can solve the problems of inability to be used as homogeneous catalysts, high cost of sulfonated resins, and difficult production, etc., so as to improve physical and mechanical properties and color and luster. , low cost, easy to operate

Active Publication Date: 2021-05-11
南京鼎立生物科技有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the synthesis of PEEK requires the use of 4,4'-difluorobenzophenone and hydroquinone, especially the production of 4,4'-difluorobenzophenone is difficult, and there are fluorides in the polymerization process. emissions, causing the cost of PEEK to prepare sulfonated resins to be too high
In addition, PEEK has a high glass transition temperature, and the glass transition temperature will be further increased after sulfonation, and generally cannot be used as a homogeneous 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
  • A kind of method utilizing composite catalyst to prepare pla and its copolymer
  • A kind of method utilizing composite catalyst to prepare pla and its copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1.1 Catalyst preparation process

[0028] A kind of preparation method for the composite catalyst of PLA and copolymer thereof, the method comprises the steps:

[0029] ①Put 0.1mol 4,4'-dichlorobenzophenone, 0.03mol polyethylene glycol 400, 0.06mol hydroquinone, and 0.5mol diphenyl sulfone into a four-necked flask with stirring, and blow nitrogen for 30 minutes , began to heat up, when the temperature reached 140 ℃, add 0.15mol sodium carbonate, keep warm for 3h.

[0030] ②Raise the temperature to 250°C, keep it warm for 2 hours, pour the reaction product into cold water to cool and solidify.

[0031] ③ The solid obtained after cooling and solidification was pulverized, washed repeatedly with acetone and water to remove the solvent diphenyl sulfone and inorganic salts, and dried in vacuum at 120°C to obtain a white powdery solid, which was designated as resin A.

[0032] ④Place resin A in a flask and add concentrated sulfuric acid. React at 100°C for 6h, dilute with ...

Embodiment 2

[0037] 2.1 a preparation method for preparing a composite catalyst of PLA and a copolymer thereof, the method may further comprise the steps:

[0038] ①Put 0.1mol 4,4'-dichlorobenzophenone, 0.03mol polyethylene glycol 400, 0.06mol hydroquinone, and 0.5mol diphenyl sulfone into a four-necked flask with stirring, and blow nitrogen for 30 minutes , began to heat up, when the temperature reached 140 ℃, add 0.15mol potassium carbonate, keep warm for 3h.

[0039] ②Raise the temperature to 250°C, keep it warm for 5 hours, pour the reaction product into cold water to cool and solidify.

[0040] ③ The solid obtained after cooling and solidification was pulverized, washed repeatedly with acetone and water to remove the solvent diphenyl sulfone and inorganic salts, and dried in vacuum at 120°C to obtain a white powdery solid, which was designated as resin A.

[0041] ④Place resin A in a flask and add concentrated sulfuric acid. React at 110°C for 5 h, dilute with pure water to obtain a...

Embodiment 3

[0046] 3.1 a preparation method for the composite catalyst of PLA and copolymer thereof, the method may further comprise the steps:

[0047] ①Put 0.1mol 4,4'-dichlorobenzophenone, 0.03mol polyethylene glycol 1000, 0.08mol hydroquinone, and 0.5mol diphenyl sulfone into a four-necked flask with stirring, and blow nitrogen for 30 minutes , began to heat up, when the temperature reached 140 ° C, 0.1mol sodium carbonate was added and kept for 3 hours.

[0048] ②Raise the temperature to 300°C, keep it warm for 2 hours, pour the reaction product into cold water to cool and solidify.

[0049] ③ The solid obtained after cooling and solidification was pulverized, washed repeatedly with acetone and water to remove the solvent diphenyl sulfone and inorganic salts, and dried in vacuum at 120°C to obtain a white powdery solid, which was designated as resin A.

[0050] ④Place resin A in a flask and add concentrated sulfuric acid. React at 120°C for 4h, dilute with pure water to obtain a su...

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 discloses a method for preparing PLA and its copolymer by using a composite catalyst, which includes preparing the composite catalyst: passing nitrogen gas through 4,4'-dichlorobenzophenone, polyethylene glycol, etc. for 30 minutes, raising the temperature, and when the temperature reaches 140°C, add alkali metal carbonate, keep warm for 3 hours; heat up to 250-300°C, keep warm for 2-5h, cool, pulverize, wash repeatedly with acetone and water, dry, put in a flask, add concentrated sulfuric acid, use pure water Dilute to obtain suspension, filter, wash with water until neutral and dry to obtain acidic resin catalyst, and then mix with heat stabilizer to obtain composite catalyst; then prepare PLA and its copolymer. The preparation method of the invention has simple process, low cost and easy operation. The catalyst prepared by the method can greatly increase the polymerization rate and shorten the polymerization reaction time, and the obtained PLA has a higher melting point and a good color phase.

Description

technical field [0001] The invention relates to the technical field of preparation of PLA and its copolymer, in particular to a method for preparing PLA and its copolymer by using a composite catalyst. Background technique [0002] Polylactic acid (PLA) and its copolymers have excellent mechanical properties and degradation properties, and since lactic acid, the raw material for the synthesis of polylactic acid, is mainly prepared by biological fermentation, PLA is also a bio-based polymer. [0003] At present, PLA is favored by people because of its advantages of bio-based, environmentally friendly and degradable, but its high price still affects its large-scale application. The production of polylactic acid can be through the one-step polycondensation method of lactic acid and the ring-opening polymerization method of lactide (referred to as the two-step method, first condensing lactic acid into low-molecular-weight PLA, and then preparing lactide through high-temperature ...

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): C08G63/08C08G63/83C08G63/87C08K5/5313
CPCC08G63/08C08G63/823C08G63/83C08G63/87C08K5/5313
Inventor 马学所李振江张锴沈磊王春
Owner 南京鼎立生物科技有限公司