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A kind of preparation method of copolyester polyurethane

A copolyester and polyurethane technology, applied in the field of polymer synthesis, can solve the problems of difficult separation and purification, high production cost, time-consuming and labor-intensive, etc., and achieve the effects of adjusting the main chain structure, low cost and reducing production cost.

Active Publication Date: 2021-06-11
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the traditional production process of polyester polyurethane can effectively solve the defects of cumbersome steps, time-consuming and laborious, difficult separation and purification, low yield, and high production cost.

Method used

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  • A kind of preparation method of copolyester polyurethane
  • A kind of preparation method of copolyester polyurethane
  • A kind of preparation method of copolyester polyurethane

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preparation example Construction

[0043] The invention provides a kind of preparation method of copolyester type polyurethane, and this preparation method comprises following two-step reaction:

[0044] Reaction 1: Under the synergistic catalysis of the non-metallic two-component catalyst, the anionic ring-opening polymerization reaction of the acid anhydride monomer and the epoxy monomer is carried out to obtain a copolyester alternating copolymer;

[0045] Reaction 2: Addition polymerization of the copolyester alternating copolymer and diisocyanate to obtain copolyester polyurethane;

[0046] Wherein, the non-metallic two-component catalyst includes two components of a thiourea compound and an organic base compound.

[0047] The present invention uses a dihydroxy compound as a chain transfer agent, adopts a non-metallic composite catalytic system composed of a thiourea compound and an organic base compound to synergistically catalyze the anionic ring-opening and alternating copolymerization of an anhydride m...

Embodiment 1

[0090] A kind of preparation method of copolyester type polyurethane comprises the serial reaction of synthesizing copolyester 1 and synthesizing poly[copolyester 1-isophorone diisocyanate], specifically comprises the following steps:

[0091] (1) In an anhydrous and oxygen-free environment, the thiourea compound 1,3-diisopropyl-2-thiourea and the organic base compound 1,8-diazabicyclo[5.4.0]undecyl- Add 0.0137g and 12.8μL of 5-ene into a 10mL reactor according to the molar ratio of 1:1, and then take 3mL and 1.2700g of the monomer propylene oxide and phthalic anhydride according to the molar ratio of 500:100 Add it and mix evenly to obtain raw material mixing system A.

[0092] (2) Add 15.4 μL of water to the raw material mixing system A described in step (1) as a chain transfer agent, the molar ratio of water to 1,3-diisopropyl-2-thiourea is 10:1, mix well and Raw material mixing system B was obtained.

[0093] (3) The raw material mixed system B obtained in step (2) was s...

Embodiment 2

[0105] A kind of preparation method of copolyester polyurethane comprises the series reaction of synthesizing copolyester 2 and synthesizing poly[copolyester 2-isophorone diisocyanate], specifically comprises the following steps:

[0106] (1) In an anhydrous and oxygen-free environment, the thiourea compound 1,3-diisopropyl-2-thiourea and the organic base compound 1,8-diazabicyclo[5.4.0]undecyl- Add 0.0069g and 32.0μL of 5-ene into a 10mL reactor according to the molar ratio of 1:5, and then take 3mL and 0.6350g of the monomer propylene oxide and phthalic anhydride according to the molar ratio of 1000:100 Add it and mix evenly to obtain raw material mixing system A.

[0107] (2) Add 0.0592g tere-xylylenedimethanol to the raw material mixing system A described in step (1) as a chain transfer agent, and the molar ratio of tere-xylylenedimethanol to 1,3-diisopropyl-2-thiourea is 10 : 1, mix uniformly to obtain raw material mixing system B.

[0108] (3) The raw material mixed sy...

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Abstract

The invention belongs to the technical field of polymer synthesis, and more specifically relates to a preparation method of copolyester polyurethane. Using thiourea compounds and organic bases to form a composite catalytic system, using water or diols as chain transfer agents, under milder conditions to co-catalyze the copolymerization of acid anhydride monomers and epoxy monomers to prepare low-alternative structures. Molecular weight copolyester diol; the composite catalytic system further catalyzes the polyaddition reaction of low molecular weight copolyester diol and diisocyanate to synthesize copolyester polyurethane. The process is a "one pot, two steps" process. As a result, the traditional production process of polyester polyurethane can effectively solve the defects of cumbersome steps, time-consuming and laborious, difficult separation and purification, low yield, and high production cost.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis, and more specifically relates to a preparation method of copolyester polyurethane. Background technique [0002] Polyurethane (referred to as polyurethane) is a general term for polymers containing urethane group repeating units in the main chain, and is usually obtained by addition polymerization of diisocyanate or polyisocyanate and dihydroxy compound or polyhydroxy compound. Among them, the hydroxyl compound constitutes the soft segment of polyurethane, and the isocyanate constitutes the hard segment. Polyurethane has the advantages of wide monomer selectivity, adjustable performance, simple synthesis and processing, good thermal stability and durability, and excellent mechanical properties. It is widely used in insulation materials, building materials, packaging materials, decorations, and imitation leather products. , auto parts and other fields have a wide range of applications. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/42C08G18/16C08G18/20C08G63/42C08G63/87C08G63/78
CPCC08G18/168C08G18/2027C08G18/2036C08G18/42C08G63/42C08G63/78C08G63/87
Inventor 解孝林丁琬芝王勇周兴平
Owner HUAZHONG UNIV OF SCI & TECH
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