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A kind of polycarbonate polyurethane and its green preparation method

A polycarbonate type, polycarbonate technology, applied in the field of green preparation of the polyurethane, can solve the problems of difficulty in meeting performance requirements, low molecular weight of the product, etc.

Active Publication Date: 2017-12-26
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These studies provide some ideas for the preparation of non-isocyanate polyurethane, but solvents are used in the preparation process of polyurethane, and the molecular weight of the product is relatively low, which is difficult to meet the performance requirements of the material. More beneficial methods need to be developed to prepare more performance. Premium Polycarbonate Polyurethane

Method used

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  • A kind of polycarbonate polyurethane and its green preparation method
  • A kind of polycarbonate polyurethane and its green preparation method
  • A kind of polycarbonate polyurethane and its green preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Take 34.8g of 1,6-hexamethylenediamine, 270g of dimethyl carbonate and 0.6g of catalyst sodium methoxide in the reaction kettle, feed nitrogen into the reaction kettle and install a condensation reflux device, raise the temperature to 75°C, and react for 2h After the reaction is completed, cool to room temperature, wash off the catalyst with excess dilute hydrochloric acid solution, filter with suction, and dry. Then the dried product is recrystallized by methanol, washed and dried to obtain white crystalline dimethyl carbamate monomer.

[0056] In an inert gas atmosphere, mix the above-mentioned dimethyl carbamate monomer, 88.5g 1,6-hexanediol and 3mg sodium carbonate, and carry out transesterification reaction at 160°C. The polycondensation reaction was carried out under the following conditions, and the hydroxyl-terminated polyurethane prepolymer was obtained after 2 hours of reaction.

[0057] The polyurethane prepolymer obtained above is mixed with 32.4 g of polyc...

Embodiment 2

[0059] Take 30g of 1,6-hexamethylenediamine, 145g of dimethyl carbonate and 0.8g of catalyst sodium methoxide in a reaction kettle, feed nitrogen into the reaction kettle and install a condensation reflux device, raise the temperature to 80°C, and react for 2h, After the reaction is completed, cool to room temperature, wash off the catalyst with excess dilute hydrochloric acid solution, filter with suction, and dry. Then the dried product is recrystallized by methanol, washed and dried to obtain white crystalline dimethyl carbamate monomer.

[0060] In an inert gas atmosphere, mix the above-mentioned dimethyl carbamate monomer, 72.5g of 1,6-hexanediol and 3.8mg of potassium carbonate, and carry out transesterification reaction at 180°C. The polycondensation reaction is carried out under pressure, and the hydroxyl-terminated polyurethane prepolymer is obtained after 2 hours of reaction.

[0061] The polyurethane prepolymer obtained above is mixed with 10.8g of polycarbonate di...

Embodiment 3

[0063] Take 42.2g of 1,4-butanediamine, 432g of dimethyl carbonate and 2.6g of catalyst sodium acetate in the reaction kettle, feed nitrogen into the reaction kettle and install a condensing reflux device, raise the temperature to 75°C, and react for 2h After the reaction is completed, cool to room temperature, wash off the catalyst with excess dilute hydrochloric acid solution, filter with suction, and dry. Then the dried product is recrystallized by methanol, washed and dried to obtain white crystalline dimethyl carbamate monomer.

[0064] In an inert gas atmosphere, mix the above-mentioned dimethyl carbamate monomer, 112g of 1,8-octanediol and 3mg of dibutyltin oxide, and carry out transesterification reaction at 165°C. The polycondensation reaction was carried out under the pressure, and the hydroxyl-terminated polyurethane prepolymer was obtained after 3 hours of reaction.

[0065] The polyurethane prepolymer obtained above is mixed with 15 g of polycarbonate diols with ...

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Abstract

The invention relates to polycarbonate polyurethane and a green preparation method thereof. The polycarbonate polyurethane comprises polyurethane structural units and aliphatic polycarbonate structural units which are irregularly distributed. The polycarbonate polyurethane is successfully prepared by a nonisocyanate method, so that isocyanate and solvents are not used, and the development requirements of green chemical industry are met. In addition, the green preparation method of the polycarbonate polyurethane is relatively mild in reaction condition and low in requirement on devices; by selecting raw materials with different structures, the polycarbonate polyurethane having different linear structures and comprising two irregularly distributed structural units can be prepared, so that the structures are diverse and controllable; the prepared polycarbonate polyurethane is free of residue of isocyanate monomers, so that the application of polycarbonate polyurethane to the fields of foods and medicines is broadened.

Description

technical field [0001] The invention relates to a polycarbonate polyurethane and a green preparation method of the polyurethane. Background technique [0002] Due to its excellent performance, polyurethane is widely used in many fields such as construction, machinery, electronic equipment, food processing, sports and medical treatment. Compared with traditional polyester polyurethane, polycarbonate polyurethane has significant advantages. In addition to good mechanical properties, it also has excellent hydrolytic stability, biological stability and compatibility, and its oxidation resistance The stability is higher than that of traditional polyether polyurethane, and it is an important environment-friendly material. [0003] However, at present, most polyurethanes are produced by the reaction of polyisocyanates and polyols. As we all know, isocyanate is highly toxic, irritating to human eyes and respiratory system, causing sensitive asthma, and having adverse effects on hu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/78C08G18/66C08G18/44C08G18/32C08G18/10
CPCC08G18/10C08G18/3206C08G18/44C08G18/664C08G18/7843
Inventor 张洁朱文祥李春成张栋肖耀南郑柳春
Owner INST OF CHEM CHINESE ACAD OF SCI
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