Polyurethane shape memory macromolecule material and synthetic technique thereof

A technology of polymer material and synthesis process, applied in the field of preparation of temperature-controlled shape memory polymers, can solve the problems of unsatisfactory shape memory effect, unsatisfactory fabric color change practical value, unsatisfactory waterproof, breathable and moisture-permeable effects, etc. To achieve good waterproof effect, improve adaptability and comfort, and enhance the effect of moisture permeability

Inactive Publication Date: 2008-01-09
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the unsatisfactory shape memory effect existing in the prior art, the unsatisfactory waterproof,

Method used

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  • Polyurethane shape memory macromolecule material and synthetic technique thereof
  • Polyurethane shape memory macromolecule material and synthetic technique thereof
  • Polyurethane shape memory macromolecule material and synthetic technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The raw material that needs to be self-made is polyether polyol, and the polyol initiator is glycerol and trimethylolpropane, the ratio is 1:1; the ratio of ethylene oxide and propylene oxide is 1:1. Hydroxyl value: 50-65, mgKOH / g functional group number: 3, acid value: 0.1-0.3mgKOH / g, moisture: 0.02-0.06%, appearance: light yellow, water solubility: soluble in water, pH value: 5-5.5 .

[0029] Polyether polyol synthesis reaction formula:

[0030]

[0031] The main technical indicators of the synthesized polyether polyol are shown in the table:

[0032] Table 1 Main technical indicators of polyether polyols

[0033] Hydroxyl value

Number of functional groups

acid value

Moisture (%)

Exterior

water soluble

pH value

50-65

3

0.1-0.3

0.02-0.06

pale yellow

Dissolved in water

5-5.5

[0034] Note: The unit of hydroxyl value and acid value is mgKOH / g, and the pH value is 1% solution.

[003...

Embodiment 2

[0041] The polyol starter is glycerin and trimethylolpropane, the ratio is 1:4;

[0042] The ratio of ethylene oxide and propylene oxide is 1:5. The reaction is the same as above to prepare polyether polyol.

[0043] A polyurethane shape memory polymer material, completed by the following process,

[0044] (1) Vacuum dehydration of raw materials: N, N dimethylformamide and 1 4-butanediol are dried, and polyester polyol is vacuum dehydrated at 130°C for 3 hours;

[0045] (2) Prepolymerization reaction: N 2 Add 20 grams of 2,4-toluene diisocyanate and 20 ml of DMF under protected conditions, add 100 grams of measured polyester polyol dropwise, and stir and react at 65°C for 1.5 hours to obtain a prepolymer;

[0046] (3) Chain extension reaction: 5 grams of 1,4-BDO and 20 grams of dimethylolpropionic acid (DMPA) were added to the reactor for chain extension reaction for 3 hours to obtain the product after chain extension;

[0047] (4) Neutralization reaction: use 10-40 grams ...

Embodiment 3

[0049] The polyol starter is glycerin and trimethylolpropane, the ratio is 1:2;

[0050] The ratio of ethylene oxide and propylene oxide is 1:3. The reaction is the same as above to prepare polyether polyol.

[0051] A kind of synthetic technique of polyurethane shape memory polymer material, comprises following steps successively,

[0052] (1) Vacuum dehydration of raw materials: N, N dimethylformamide and 14-butanediol are dried, and polyether polyol is vacuum dehydrated at 120°C for 2 hours;

[0053] (2) Prepolymerization reaction: N 2 Add 30 grams of 2,4-toluene diisocyanate and 25 ml of DMF under protected conditions, add 120 grams of measured polyether polyol dropwise, and stir and react at 70°C for 2 hours to obtain a prepolymer;

[0054] (3) Chain extension reaction: 3 grams of 1,4-BDO and 35 grams of dimethylolpropionic acid (DMPA) were added to the reactor for chain extension reaction for 2 hours to obtain the product after chain extension;

[0055] (4) Neutraliz...

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Abstract

A polyurethane shape memory polymer material and its synthesis are disclosed. The process is carried out by vacuum dewatering, pre-polymerization reacting 2,4-toluene diiso-cyanate with DMF under N2 protection, dripping into polyhydric alcohol to obtain pre-polymer, chain-extending reacting DMPA with 1,4-BDO, neutralization reacting TEA with DMPA carboxyl, and adding water 300-1000 ml to obtain final product. The final solution concentration is 15-25 mol%. It has excellent waterproof, gas-permeation performances and moisture-penetrability.

Description

Technical field: [0001] The invention relates to the technical field of preparation of temperature-controlled shape-memory polymers, in particular to a polyurethane shape-memory polymer material and a synthesis process thereof. Background technique: [0002] Shape memory polymer or shape memory polymer (SMP, Shape Memory Polymer), as a functional polymer material, is a new branch of research, development and application of polymer materials. Since the shape memory function of Ni-Ti alloy was discovered in the 1960s, shape memory materials have attracted worldwide attention for their special properties. In 1981, Ota.SL1 and others made cross-linked polyethylene with special heat recovery shape memory effect through radiation method, becoming the first shape memory polymer material in the world. Compared with shape memory alloy (SMA), SMP has many advantages such as large amount of deformation, easy shaping, easy adjustment of shape memory temperature, good electrical insulat...

Claims

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Application Information

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IPC IPC(8): C08G18/10C08G18/76C08G18/48
Inventor 习智华
Owner XI'AN POLYTECHNIC UNIVERSITY
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