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Polyurethane nanometer powder for surface phosphoric acid modification and preparation method thereof

A technology of nano-powder and polyurethane, which is applied in the field of surface phosphoric acid-modified polyurethane nano-powder and its preparation, which can solve the problems of high surface energy, large specific surface area of ​​nano-powder, inconvenient preparation, storage and application, etc.

Active Publication Date: 2009-12-16
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Due to the large specific surface area and high surface energy, the prepared nanopowder is easy to cause agglomeration, which not only brings great inconvenience to preparation, storage and application, but also causes nanomaterials to lose their unique properties. development bottleneck

Method used

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  • Polyurethane nanometer powder for surface phosphoric acid modification and preparation method thereof
  • Polyurethane nanometer powder for surface phosphoric acid modification and preparation method thereof
  • Polyurethane nanometer powder for surface phosphoric acid modification and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1、200

[0023] Example 1, Polyurethane nano-powder with a particle size of about 200nm phosphoric acid surface modification and its preparation

[0024] Pour 4.2 g of diphenylmethane diisocyanate (MDI) dissolved in 200 ml of ethyl acetate and 7.5 g of polytetrahydrofuran (PTMG, 2000) in a molten state into a container equipped with a condenser tube, a mechanical stirrer, a nitrogen outlet, and a thermometer. In the four-necked flask, add the N-methylpyrrolidone (NMP) solution (6% solution, wherein DMPA0.9g) of dihydroxyethylpropionic acid (DMPA) dropwise, under the protection of nitrogen, at a temperature of 80°C, mechanically stir the reaction After 3 hours, add excess isopropanol or n-butanol to block, then add triethylamine to adjust the pH of the solution to neutrality, add dropwise 50ml of deionized water containing 10% sodium dodecylsulfonate and vigorously stir and emulsify to obtain nano water-based emulsion. Add 0.2 mol / L pH=7.0 phosphate buffer solution and toluene (the vol...

Embodiment 2、50

[0027] Example 2, 50nm, 400nm, 500nm or so particle size phosphoric acid surface modified polyurethane nanopowder and its preparation

[0028] The surfactant dosage added in the emulsification process of embodiment 1 is adjusted to 20%, 4% and 2% concentration respectively, and all the other reagent types, consumption and steps are all the same with embodiment 1, obtain average particle diameter and be respectively 50nm, 400nm (see figure 1 B) and 500nm phosphoric acid surface-modified polyurethane nanopowder.

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Abstract

The invention relates to an organic superpolymer nanometer powder for surface chemical modification and a preparation method thereof; the nanometer powder material for phosphoric acid modification is polyether polyurethane or polyether polyurethane nanometer powder, the surface of the powder is provided with phosphoric acid radical groups; the nanometer powder is prepared by the following method: in the polyether polyurethane or polyether polyurethane nanometer powder, the phosphoric acid radical groups are led in a phosphoric acid buffer system by a way of physical adsorption; the method can improve the stability and dispersibility of the powder and can change the physical, chemical and biological performances, so as to realize deep and wide application in the biology medical field. The powder particle of the nanometer powder for surface modification is from 50 nanometer to 500 nanometer, and the size is controllable, the Zeta electrical potential of the powder is negative under the physiological environment, the process route is simple, energy consumption is less without pollution, thereby providing a new concept for the surface modification of the organic superpolymer nanometer powder and expanding a road for the development and utilization of superpolymer nanometer medical materials.

Description

technical field [0001] The invention relates to the synthesis and preparation of surface phosphoric acid modified polyurethane nano powder material. technical background [0002] Polyurethane (PU) refers to a class of high polymers containing carbamate (-NHCOO-) characteristic groups on the main chain, which are prepared by reacting polyisocyanate with polyether or polyester polyols,- N=C=O+HO-→-NHCOO-, to obtain the corresponding polyether polyurethane or polyester polyurethane. Since it was first synthesized by Bayer in 1937, it has been widely used in various fields of coatings, foams and elastomers. Among them, since the animal experiments of Boretor and Pietrce in 1967, polyurethane elastomers have shown that they have both good biological stability and anticoagulant properties. People began to develop a large number of polyether polyurethane biomedical materials, and formed a series of practical materials Valuable artificial heart valves, artificial blood vessels and...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08L75/06C08L75/08
CPCC08J3/12C08G18/836C08J2375/04C08G18/12C08G18/0823C08G18/7671C08G18/6692C08J3/16C08G18/4854Y10T428/2998C08G18/2825
Inventor 黄晓华刘红科朱丹包建春毛春
Owner NANJING NORMAL UNIVERSITY
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