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A kind of linear thermosensitive polyurethane and preparation method thereof

A technology of temperature-sensitive polyurethane, which is applied in the field of linear temperature-sensitive polyurethane and its preparation, can solve the problems of complex synthesis method and high production cost, and achieve the effect of simple synthesis method, cost saving and good temperature-sensitive effect

Active Publication Date: 2019-04-23
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temperature-sensitive polyurethane with N-isopropylacrylamide polymer as the temperature-sensitive segment has good temperature-sensitive properties and broad application prospects, but its synthesis method is mainly chemical grafting, that is, to synthesize the polyurethane segment and Poly N-isopropylacrylamide chain forging, and then use the latter to chemically graft the former, the synthesis method is relatively complicated, and the production cost is high

Method used

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  • A kind of linear thermosensitive polyurethane and preparation method thereof
  • A kind of linear thermosensitive polyurethane and preparation method thereof
  • A kind of linear thermosensitive polyurethane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of linear thermosensitive polyurethane, its preparation method is as follows:

[0023] In a 250mL four-neck flask, add 0.007mol (7g) of polycarbonate diol (PCDL-1000, indicating that the molecular weight is 1000), remove water under vacuum at 130°C for 2 hours at a vacuum of 0.095MPa, add 0.003mol (0.4024 g) Dimethylolpropionic acid (DMPA), 10 mL N-methylpyrrolidone (NMP) and 50 mL acetone. Then raise the temperature to 80°C and under nitrogen protection, add 0.012mol (2.0183g) hexamethylene diisocyanate (HDI), and add the catalyst dibutyltin dilaurate (DBTDL) of 0.0008mol (0.5g), this Under the same conditions, react for 3 hours, then add 0.004mol (0.2405g) of ethylenediamine monomer and 0.0049mol (0.50g) of triethylamine in sequence, and react for 2 hours without changing the reaction conditions to obtain a line with an amino group as the terminal group. Type polyurethane, then add 0.004mol (0.4526g) N-isopropylacrylamide, under the condition of constant react...

Embodiment 2

[0025] A kind of linear thermosensitive polyurethane, its preparation method is as follows:

[0026] In a 250mL four-neck flask, add 0.0063mol (12.6g) of polycarbonate diol (PCDL-2000), at 130°C, vacuum 0.095MPa to remove water for 2 hours, add 0.003mol (0.4024g) of diol Methylpropionic acid (DMPA), 10 mL N-methylpyrrolidone (NMP), and 40 mL acetone. Then raise the temperature to 85°C and under nitrogen protection, add 0.015mol (2.5229g) hexamethylene diisocyanate (HDI), and add the catalyst dibutyltin dilaurate (DBTDL) of 0.0005mol (0.3g), this Under the same conditions, react for 3 hours, then add 0.0042mol (0.2525g) of ethylenediamine monomer and 0.0045mol (0.46g) of triethylamine in sequence, and react for 2 hours without changing the reaction conditions to obtain a line with an amino group as the terminal group. Type polyurethane, then add 0.0042mol (0.4752g) N-isopropylacrylamide, under the condition of constant reaction conditions, react for 12h, finally add 180mL deio...

Embodiment 3

[0028] A kind of linear thermosensitive polyurethane, its preparation method is as follows:

[0029] In a 250mL four-neck flask, add 0.0075mol (3.75g) of polycarbonate diol (PCDL-500), at 130°C, vacuum 0.095MPa to remove water for 2h, add 0.003mol (0.4024g) of diol Methylpropionic acid (DMPA), 10 mL N-methylpyrrolidone (NMP), and 30 mL acetone. Then raise the temperature to 75°C and under nitrogen protection, add 0.012mol (2.0183g) hexamethylene diisocyanate (HDI), and add the catalyst dibutyltin dilaurate (DBTDL) of 0.0005mol (0.3g), this Under the condition of reaction for 3 hours, then add 0.0039mol (0.2345g) of ethylenediamine monomer and 0.0051mol (0.52g) of triethylamine in sequence. Under the condition that the reaction conditions do not change, react for 2 hours to obtain a line with an amino group as the terminal group. Type polyurethane, then add 0.0039mol (0.4413g) N-isopropylacrylamide, under the same reaction conditions, react for 12h, finally add 150mL deionized...

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Abstract

The invention relates to the field of functional macromolecular materials, in particular to novel linear temperature-sensitive type polyurethane and a preparation method thereof. The preparation method of polyurethane comprises steps as follows: polycarbonate diol and dimethylolpropionic acid are added to an organic solvent and are mixed uniformly at the temperature of 75-85 DEG C under the protection of nitrogen, then hexamethylene diisocyanate and a catalyst are added, the mixture is stirred at the temperature of 75-85 DEG C and reacts for more than 3 h to generate linear polyurethane with isocyanato as an end group, ethylenediamine and triethylamine are added, the mixture is stirred to react for 2 h or longer, linear polyurethane with amino as an end group is obtained, N-isopropyl acrylamide is added, the mixture is stirred to react for 12 h or longer, then deionized water is added, an organic solvent is removed through rotary evaporation in a vacuum state, and the novel linear temperature-sensitive type polyurethane is obtained. Two ends of a polyurethane chain segment of the novel linear temperature-sensitive type polyurethane are directly sealed with N-isopropyl acrylamide, no other chain segments are contained, the synthetic method is simple, the synthesis and chemical grafting steps of poly(N-isopropyl acrylamide) are omitted, synthetic raw materials are also saved, and the cost is reduced.

Description

technical field [0001] The invention relates to the field of polymer functional materials, in particular to a linear temperature-sensitive polyurethane and a preparation method thereof. Background technique [0002] Temperature-sensitive polyurethane combines the excellent mechanical properties of polyurethane (PU) with the temperature sensitivity of temperature-sensitive substances, and has the advantages of good water solubility, low environmental pollution, good viscosity, high strength and wear resistance. In addition, it also has the characteristics of intelligent temperature stimulus responsiveness and shape memory effect, and has been widely used in coatings and biomaterials in recent years. [0003] At this stage, whether it is a physical blending method or a chemical grafting method, the molecule of the synthesized temperature-sensitive polyurethane is structurally divided into two parts, one part is a polyurethane segment, and the other is a polymer chain with temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/73C08G18/67C08G18/66C08G18/44C08G18/34C08G18/32C08G18/83
CPCC08G18/0823C08G18/3228C08G18/348C08G18/44C08G18/6659C08G18/671C08G18/73C08G18/833
Inventor 徐祖顺张博晓严正曾有兰肖利吉袁天梦李庚茜
Owner HUBEI UNIV
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