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Polyurethane with increased modulus after water absorption as well as preparation method and application of polyurethane

A polyurethane and post-molding technology, applied in the field of medical materials, can solve the problems of modulus and strength decrease, modulus increase, etc.

Active Publication Date: 2021-09-10
眉山尤博瑞新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the characteristic that the modulus of the polyurethane material increases after absorbing water not only solves the problem of the decrease in modulus and strength caused by the hydrophilic component of its side chain, but also the hydrophilic component can form a hydration layer, Endows it with good anti-protein adsorption ability

Method used

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  • Polyurethane with increased modulus after water absorption as well as preparation method and application of polyurethane
  • Polyurethane with increased modulus after water absorption as well as preparation method and application of polyurethane
  • Polyurethane with increased modulus after water absorption as well as preparation method and application of polyurethane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A kind of polyurethane material that absorbs water and causes hardening, its preparation method comprises the following steps:

[0042] 1) Dissolve Ymer N-120 (trimethylpropane polyethylene glycol monomethyl ether) with a number average molecular weight of 1000 in chloroform, wash with deionized water to remove residual water-soluble alkaline impurities in the raw material, and after phase separation, The chloroform phase was collected and dried by a rotary evaporator;

[0043] 2) Prepolymerization reaction: depressurize the YmerN-120 in step (1) in a three-neck round bottle and dry it in vacuum at 90-100°C for 2h, then add HMDI and organic bismuth catalyst in turn, and mechanically stir at 70°C for 1h;

[0044] 3) Chain extension reaction: add BDO (1,4-butanediol) to the result of step (2), stir for about 1 min, pour it into a polytetrafluoroethylene mold, and mature it at 100°C for 6 hours to make the reaction Carried out completely, polyurethane is obtained.

[004...

experiment example 1

[0050] Characterization test is carried out to embodiment 1 gained SPPU series polyurethane, relevant characterization experiment method and data analysis are as follows:

[0051] 1) Gel Permeation Chromatography (GPC)

[0052] Weigh a certain amount of polyurethane sample and dissolve it in GPC mobile phase (LiBr / DMF) to make a polyurethane solution with a concentration of about 5 mg / mL, filter it with a 0.22 μm filter head to remove a small amount of impurities in the polyurethane solution, and then inject it into In the instrument, the test is performed, the mobile phase flow rate is set to 1mL / min, the instrument temperature is 40°C, and monodisperse polymethyl methacrylate (PMMA) is used as a standard sample to calculate the molecular weight of the sample.

[0053] The test results show (see Table 2) that the molecular weights and distributions of all samples are within a reasonable range and relatively close.

[0054] Table 2 Molecular weight and distribution of SPPU se...

Embodiment 2

[0069] A polyurethane material hardened by water absorption, its preparation method refers to Example 1, the difference is that half of the chain extender BDO in the SPPU is replaced by a polycaprolactone oligomer diol with an average degree of polymerization of 2, synthesized Polyurethane is called DSPPU (synthetic route sees Figure 5 ), the polyurethane can be degraded by hydrolysis of ester bonds.

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Abstract

The invention provides polyurethane with increased modulus after water absorption as well as a preparation method and application of the polyurethane. Main chains of the polyurethane are all hard segments, and hydrophilic soft segments are all located on side chains. The polyurethane is soft and low in modulus in a dry state. After the polyurethane absorbs water, the polyurethane hardens, and the modulus is obviously increased. The polyurethane material with the increased modulus after water absorption has a wide application prospect in the aspect of medical implant materials. When the polyurethane material is applied to the medical implant materials, the polyurethane material has the advantages of being soft during implantation, easy to implant and capable of absorbing water to be hardened after implantation, and meets the requirement for high modulus during use. The polyurethane material provided by the invention has a wide application prospect in the field of implantable medical materials such as lumen stents.

Description

technical field [0001] The invention belongs to the technical field of medical materials and relates to a polyurethane material, in particular to a polyurethane whose modulus increases after absorbing water and its preparation method and application. Background technique [0002] Polyurethane (referred to as PU) refers to a class of polymer materials containing repeated urethane bonds (-NHCOO-) in its molecular structure, and is the abbreviation of polyurethane. In the polyurethane structure, the hard segment and the soft segment are distributed alternately in the polymer chain, and the soft segment endows the polyurethane with good elasticity; the hard chain includes isocyanate and chain extender, which endows the polyurethane with good strength and modulus. Due to the flexible and diverse adjustment methods of polyurethane, the different component selection and preparation methods, the performance of various products is quite different. [0003] Polyurethane has a wide ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/62C08G18/48C08G18/42C08G18/34C08G18/32C08G18/12C08G18/10A61L27/50A61L27/18
CPCC08G18/4833C08G18/758C08G18/10C08G18/4277C08G18/348C08G18/3206C08G18/12C08G18/6287A61L27/18A61L27/50C08L75/08C08L75/04C08G18/42C08G18/62
Inventor 谭鸿李震刘文凯李洁华杨瑞波罗锋傅强
Owner 眉山尤博瑞新材料有限公司
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