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Degradable waterborne polyurethane/polyvinyl alcohol composite material and preparation method therefor

A technology of water-based polyurethane and polyvinyl alcohol, applied in the field of degradable water-based polyurethane/polyvinyl alcohol composite materials, the preparation of the above-mentioned degradable water-based polyurethane/polyvinyl alcohol composite materials, can solve the problem of incomplete degradation, excessive organic solvents, etc. problems, achieve the effects of low organic solvent content, improved degradation performance, and enhanced thermal stability

Inactive Publication Date: 2015-11-11
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a degradable water-based polyurethane / polyvinyl alcohol composite material, which overcomes the defects that the existing polyurethane / polyvinyl alcohol composite material has too many organic solvents and cannot be completely degraded, and provides a non-toxic and degradable water-based polyurethane / polyvinyl alcohol composite material. polyvinyl alcohol composite

Method used

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  • Degradable waterborne polyurethane/polyvinyl alcohol composite material and preparation method therefor
  • Degradable waterborne polyurethane/polyvinyl alcohol composite material and preparation method therefor
  • Degradable waterborne polyurethane/polyvinyl alcohol composite material and preparation method therefor

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preparation example Construction

[0050] The preparation of polyvinyl alcohol solution is carried out as follows:

[0051] The polyvinyl alcohol is dissolved in distilled water, soaked for 2-2.5 hours first, and then stirred in a 90°C constant temperature water bath for 2 hours to completely dissolve the polyvinyl alcohol to prepare a polyvinyl alcohol solution with a mass fraction of 12-18%.

[0052] As a preferred solution of the embodiment of the present invention, in step 3, when preparing the water-based polyurethane / polyvinyl alcohol composite material, the water-based polyurethane emulsion and polyvinyl alcohol solution obtained in step 2 are mixed and stirred evenly according to the volume ratio of 1:1, and the obtained mixed The solution is placed on a polytetrafluoroethylene plate, and after it is leveled, it is dried to remove moisture to obtain a degradable water-based polyurethane / polyvinyl alcohol composite material.

[0053] As a preferred version of the embodiment of the present invention, in s...

Embodiment 1

[0065] Embodiment 1, degradable waterborne polyurethane / polyvinyl alcohol composite material, adopts the raw material of mass parts in Table 1:

[0066] Table 1 Degradable waterborne polyurethane / polyvinyl alcohol composite raw material ratio (mass parts)

[0067]

[0068] Preparation:

[0069] First prepare the waterborne polyurethane prepolymer:

[0070] 1) Dry the hydroxyl-terminated L-lactic acid-3000 (PLLA-3000) and polyneopentyl adipate-2000 (PNA-2000) in vacuum at 120°C for 2 hours, and then put the hydroxyl-terminated L-lactic acid and poly Add neopentyl glycol adipate into a clean four-neck flask equipped with a reflux condenser, thermometer and stirring device, put the flask into a constant temperature water bath at 85°C and stir, melt and blend for 30 minutes; raw material PLLA-3000 Indicates that the molecular weight of PLLA is 3000, and PNA-2000 indicates that the molecular weight of PNA is 3000.

[0071] 2) Add isophorone diisocyanate, heat up to 90°C, and ...

Embodiment 2

[0077] Embodiment 2, degradable water-based polyurethane / polyvinyl alcohol composite material, adopts the raw material of mass parts in Table 2:

[0078] Table 2 Degradable waterborne polyurethane / polyvinyl alcohol composite raw material ratio (mass parts)

[0079]

[0080] Preparation:

[0081] First prepare the waterborne polyurethane prepolymer:

[0082] 1) The hydroxyl-terminated L-lactic acid-3000 (PLLA-3000) and polyneopentyl adipate-2000 (PNA-2000) were vacuum-dried at 120°C for 1.5 hours, and then the hydroxyl-terminated L-lactic acid and poly Add neopentyl glycol adipate into a clean four-necked flask with a reflux condenser, a thermometer and a stirring device, put the flask into a constant temperature water bath at 85°C and stir, and melt and blend for 45 minutes;

[0083] 2) Add isophorone diisocyanate, heat up to 90°C, and stir for 3 hours;

[0084] 3) Add dibutyltin dilaurate and continue to stir for 40 minutes;

[0085] 4) Lower the temperature of the rea...

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Abstract

The invention discloses a degradable waterborne polyurethane / polyvinyl alcohol composite material. The degradable waterborne polyurethane / polyvinyl alcohol composite material is prepared from the following raw materials in parts by mass: 7-17 parts of isophorone diisocyanate, 14-24 parts of hydroxy-terminated poly-L-lactic acid, 8-18 parts of polyneopentanediol adipate, 3-5 parts of dimethylolpropionic acid, 2-7 parts of N-methyl pyrrolidone, 1-5 parts of acetone, 1.5-4.5 parts of triethylamine, 30-40 parts of deionized water, 22-32 parts of polyvinyl alcohol and 0.05-0.1 part of dibutyltin dilaurate. The preparation method comprises: step 1, weighing raw materials; step 2, preparing waterborne polyurethane emulsion and a polyvinyl alcohol solution; and step 3, preparing the waterborne polyurethane / polyvinyl alcohol composite material. The degradable waterborne polyurethane / polyvinyl alcohol composite material prepared by the preparation method disclosed by the invention does not pollute the environment, and is a biodegradable type material.

Description

technical field [0001] The invention belongs to the field of synthesis of organic polymer composite materials, and specifically relates to a degradable waterborne polyurethane / polyvinyl alcohol composite material, and also relates to a preparation method of the above-mentioned degradable waterborne polyurethane / polyvinyl alcohol composite material. Background technique [0002] The full name of polyurethane is polyurethane, which contains repeated carbamate groups in the main chain. It is a general term for macromolecular compounds. It is a block copolymer formed by addition polymerization of organic diisocyanate or polyisocyanate and dihydroxy or polyhydroxy compound. Diisocyanate or polyisocyanate and small molecule chain extender form a hard segment. Dihydroxy Or polyols make up the soft segment. The special block structure of polyurethane makes it have good biocompatibility and blood compatibility. In addition, polyurethane also has excellent mechanical properties, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/06C08L29/04C08G18/75C08G18/66C08G18/42C08G18/34C08G18/12
Inventor 方长青王蔚言周星雷婉青
Owner XIAN UNIV OF TECH
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