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Degradable polyether urethane and preparation method thereof

A technology of polyether polyurethane and esterified polyether is applied in the field of polyurethane materials to achieve the effects of clear product structure, efficient and controllable reaction, and abundant stock.

Inactive Publication Date: 2019-12-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it has not been used for further preparation of degradable polyether polyurethane

Method used

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  • Degradable polyether urethane and preparation method thereof
  • Degradable polyether urethane and preparation method thereof
  • Degradable polyether urethane and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0035] In this embodiment, the ring-opening polymerization of ethylene oxide is carried out with hydroxy acid as an initiator, and polyethylene oxide glycol (esterified PEG 1 with a single ester bond in the middle of the polymer chain is synthesized, the number of ester bonds is 1, hereinafter referred to as ePEG 1).

[0036] The specific operation is as follows:

[0037] In an inert atmosphere, add 1 part (mol parts) of lactic acid into a dry glass reactor, and add dry tetrahydrofuran to dissolve it. Continue to add phosphazene base t-BuP containing 0.005 parts 1 With 0.025 parts of triethylborane in tetrahydrofuran solution, stir and mix evenly. Connect the glass reactor to a vacuum line, remove part of the gas in the bottle, and cool down with an ice-water bath. Add 45 parts of dry ethylene oxide at 0-4°C, seal the glass reactor and react at room temperature (20-30°C) for 4h. After the ethylene oxide reaction was finished, solid products could be seen to precipitate out...

Embodiment 2

[0039] In this embodiment, glutaric acid is used as an initiator to carry out the ring-opening polymerization of ethylene oxide to synthesize polyethylene oxide glycol (esterified PEG 2 with a diester bond in the middle of the polymer chain, the number of ester bonds is 2, the following Called ePEG 2). In this embodiment, the carboxylic acid initiator is replaced with 1 part (parts by mole) of glutaric acid, and the others are the same as in Example 1. Seal the reactor and react at room temperature for 4h, that is. Theoretical number average molecular weight M of polyethylene oxide n,th is 2.0kg / mol. The molecular weight measured by SEC was 2.1 kg / mol, and the degree of dispersion was 1.12.

Embodiment 3

[0041] In this example, the ring-opening polymerization of propylene oxide is carried out with hydroxy acid as the initiator, and the polypropylene oxide diol (esterified PPG 1 with a single ester bond in the middle of the polymer chain is synthesized, the number of ester bonds is 1, hereinafter referred to as ePPG 1 ).

[0042] The specific operation is as follows:

[0043] In an inert atmosphere, add 1 part (mol parts) of lactic acid into a dry glass reactor, and add dry tetrahydrofuran to dissolve it. Continue to add phosphazene base t-BuP containing 0.05 phr 2 With 0.15 parts of triethylborane in tetrahydrofuran solution, stir and mix evenly. Continue to add 30 parts of dry propylene oxide, seal the glass reactor and react at room temperature for 6h. Under inert atmosphere (in glove box, or pass into inert gas process) open reactor, take out a small amount of reaction solution, join in deuterated chloroform and be used for proton nuclear magnetic resonance spectrum test...

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Abstract

The invention belongs to the field of polyurethane materials and discloses a degradable polyether urethane and a preparation method thereof. The preparation method comprises the following steps: performing controllable open-loop polymerization of an epoxy monomer by using a carboxylic acid type catalysis / initialization system so as to synthesize esterified polyether polyol; and performing a mixingreaction on the esterified polyether polyol and isocyanate, so as to prepare degradable polyether urethane, wherein the obtained degradable polyether urethane can be degraded at a controllable velocity under acid, alkali and biological conditions. By adopting the method, the degradable polyurethane is prepared from the esterified polyether polyol, and compared with a method that an ester bond oracetal is introduced into isocyanate or a micromolecule chain extender, the method needs no extra step of micromolecule pre-synthesis.

Description

technical field [0001] The invention belongs to the field of polyurethane materials, and in particular relates to a degradable polyether polyurethane and a preparation method thereof. Background technique [0002] The full name of polyurethane is polyurethane (Polyurethanes, PUs), which is a general term for polymer compounds containing repeated carbamate (-NHCOO-) groups on the main chain. It is a multi-block copolymer composed of organic diisocyanate or polyisocyanate and dihydroxyl or polyhydroxyl compound through gradual polymerization. It has the characteristics of easy design of molecular structure and adjustable performance. [0003] [0004] Polyurethane molecular chains can generally be divided into soft segments and hard segments. The soft segment is composed of soft segments whose glass transition temperature is lower than room temperature, and the hard segment is composed of rigid segments whose glass transition temperature is higher than room temperature. So...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/38C08G65/28C08G65/26
CPCC08G18/4887C08G18/6674C08G18/6677C08G18/6685C08G65/2615
Inventor 赵俊鹏陈烨张广照
Owner SOUTH CHINA UNIV OF TECH
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