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Reshapable shape-memory resin excelling in shape recovery capability and shaped item of the resin having been crosslinked

一种树脂、记忆的技术，应用在产品、运输和包装、塑料回收等方向，能够解决成型产品变形、没有提及生物降解性热固性或光固性树脂回收等问题，达到优异形状恢复性、优异成型和重新成型性的效果

Inactive Publication Date: 2007-01-10
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 2. Deformation of molded products
However, there is no mention of recycling of biodegradable thermoset or light-cure resins

Method used

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  • Reshapable shape-memory resin excelling in shape recovery capability and shaped item of the resin having been crosslinked
  • Reshapable shape-memory resin excelling in shape recovery capability and shaped item of the resin having been crosslinked
  • Reshapable shape-memory resin excelling in shape recovery capability and shaped item of the resin having been crosslinked

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0175] First, 1000g of commercially available polylactic acid (trade name: Lacty (R) , produced by Shimadzu Corporation) and 75.6 g of pentaerythritol were melt-mixed at 200° C. for 3 hours. In this way, a transesterification reaction is carried out. The resulting mixture was dissolved in 1 L of chloroform and then poured into a large amount of methanol to precipitate hydroxyl-terminated polylactic acid [R1].

[0176] Next, 100 g of 2-furfuryl alcohol, 112 g of succinic anhydride, and 2 ml of pyridine were dissolved in 1 L of chloroform, and heated under reflux for 10 hours. The solution was washed with water, and the solvent was distilled off to synthesize a furan derivative [F1]. Add 31.4g of 1-ethyl-3-(3'-dimethylaminopropyl) carbodiimide hydrochloride (WSC), 13.0g of pyridine, 32.5g of [F1] and 100g of [R1] in 500ml of chloroform, Heat at reflux for 10 hours. The resulting solution was washed with water, dried over magnesium sulfate, and the solvent was distilled off t...

Embodiment 2

[0183] First, 2000 g of commercially available polylactic acid and 178 g of sorbitol were melt-mixed at 200° C. for 15 hours. In this way, a transesterification reaction is carried out. The resulting mixture was dissolved in 2 L of chloroform, and then poured into a large amount of methanol to precipitate polylactic acid [R5] with hydroxyl ends.

[0184] Next, 72 g of WSC, 30.0 ml of pyridine, 74.2 g of [F1] and 132 g of [R5] were added to 400 ml of chloroform, followed by heating under reflux for 43 hours. The solution was washed with water, dried over magnesium sulfate, and thereafter the solvent was distilled off to obtain furan-modified polylactic acid [R6] (molecular weight: 6940).

[0185] Then weigh 10.3g of [R6] and 1.20g of [R3] synthesized above, melt and mix them at 170°C for 3 minutes, and crosslink them by Diels-Alder reaction at 100°C for 1 hour to obtain the crosslinked product of polylactic acid [R7 ]. Tg is 65°C and Td is 155°C. The crosslink density was 0...

Embodiment 3

[0188] First, 2000 g of commercially available polylactic acid and 197 g of sorbitol were melt-mixed at 200° C. for 15 hours. In this way, a transesterification reaction is carried out. The resulting mixture was dissolved in 2 L of chloroform and then poured into a large amount of methanol to precipitate hydroxyl-terminated polylactic acid [R8].

[0189] Next, 72.3 g of WSC, 30.0 ml of pyridine, 74.5 g of [F1] and 120 g of [R8] were added to 500 ml of chloroform, followed by heating under reflux for 43 hours. The solution was washed with water, dried over magnesium sulfate, and thereafter the solvent was distilled off to obtain furan-modified polylactic acid [R9] (molecular weight: 6286).

[0190] Then weigh 10.0 g of [R9] and 1.23 g of [R3] synthesized above, melt and mix them at 170°C for 3 minutes, and crosslink them by Diels-Alder reaction at 100°C for 1 hour to obtain the crosslinked product of polylactic acid [R10 ]. Tg is 70°C and Td is 154°C. The crosslink density ...

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Abstract

It is possible to provide a shape-memory molded product having excellent shape-memory properties and recycling efficiency by using a shape-memory resin having a glass transition temperature (Tg) within the range of 40 DEG C. to 200 DEG C. and a dissociation temperature (Td) of a thermo-reversible reaction within the range of 50 DEG C. to 300 DEG C. and satisfying the relationship: Tg+10 DEG C.<=Td, wherein the resin is deformed at a temperature of Tg to less than Td, and cross-linked through a thermo-reversible reaction in which a covalent bond is formed by cooling and dissociated by heating.

Description

technical field [0001] The present invention relates to a shape-memory resin composition excellent in reshapeability and shape recovery. The present invention also relates to a shaped product composed of a crosslinked resin, deformed molding and a method of using it. Background technique [0002] As materials having shape memory, alloy materials and resin materials are known in the art. Shape memory alloys can be used in pipe fittings and straightening teeth, while shape memory resins can be used in heat shrink tubing and laminates, retaining pins and medical devices such as plaster casts. Unlike shape memory alloys, shape memory resins have the following advantages. The resin can be processed into complex shapes, has high shape recovery efficiency, is light in weight, easy to color and low in cost. Because of these advantages, the shape memory resin can expand the field of application. [0003] The shape memory resin has the following characteristics. It can be deforme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G85/00C08F8/00C08G63/91C08G64/42C08L101/16C08G63/08C08J11/04C08K5/12
CPCC08G2280/00C08G63/08C08J2367/04C08G63/91C08K5/12C08J3/247C08G2230/00Y10T428/31504C08J11/04C08G63/912Y02P20/143Y02W30/62C08L67/04
Inventor 志村绿井上和彦位地正年
Owner NEC CORP
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