Silane modified polylactic acid as well as preparation method and application thereof

A technology of silane-modified polylactic acid, which is applied in the direction of adhesives, etc., can solve problems such as the application of silane-modified polylactic acid that have not yet appeared, and achieve the effects of avoiding adverse effects, improving flexibility and hydrophilicity, and simple preparation process

Active Publication Date: 2020-03-24
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of silane-modified polylactic acid in the field of adhesives has not yet appeared

Method used

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  • Silane modified polylactic acid as well as preparation method and application thereof
  • Silane modified polylactic acid as well as preparation method and application thereof
  • Silane modified polylactic acid as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035]1) Add 80.4g of polyether polyol with a number average molecular weight of 300 (1,2-propylene glycol, PO homopolymerization), 325.5g of lactide, and 2.0g of stannous octoate into a three-necked flask, start stirring and vacuumize 1. Nitrogen replacement was alternated 5 times, and the temperature was raised to 140° C. under the protection of nitrogen, and kept at this temperature for 12 hours to obtain 403.8 g of polylactic acid polyols with an acid value of 4.2 mgKOH / g.

[0036] 2) Take 300.3g of the above-mentioned polylactic acid polyol and add 0.3g of ferric chloride into a pressure-resistant reaction kettle, start stirring, vacuumize, alternate nitrogen replacement for 5 times, then heat up to 120°C, add 5.6g of propylene oxide (for poly 4.3 times the number of moles of carboxyl groups of lactic acid polyols), pressurize to 0.5MPa with nitrogen, keep warm at 120°C for 3.5h, then vacuumize to remove unreacted propylene oxide, cool down to below 40°C to obtain polylact...

Embodiment 2

[0039] 1) Add 200.3 g of polyether polyols with a number-average molecular weight of 1000 (glycerin starts, PO, EO random copolymerization, EO mass content in polyether segments is 15%), 400.7 g of lactide, in a three-necked flask, 3.0g of stannous octoate, start stirring, vacuumize and replace with nitrogen 5 times alternately, raise the temperature to 135°C under the protection of nitrogen, and keep the temperature for 15h to obtain 596.7g of polylactic acid polyol with an acid value of 3.7mgKOH / g.

[0040] 2) Take 450.7g of the above-mentioned polylactic acid polyol, add 3.2g of chromium acetate into a pressure-resistant reactor, start stirring, vacuumize, alternate nitrogen replacement for 5 times, then heat up to 85°C, add 4.8g of propylene oxide (polylactic acid polyol 2.8 times the number of moles of carboxyl groups of alcohol), pressurize with nitrogen to 0.27MPa, keep warm at 85°C for 3.5h, then vacuumize to remove unreacted propylene oxide, cool down to below 40°C a...

Embodiment 3

[0043] 1) Add 125.6g of polyether polyol (starting from ethylene glycol, EO homopolymerization) with a number average molecular weight of 800, 500.9g of lactide, and 3.2g of stannous octoate into a three-necked flask, start stirring, vacuumize, and nitrogen The replacement was alternated 5 times, and the temperature was raised to 140° C. under the protection of nitrogen, and kept at this temperature for 14 hours to obtain 623.2 g of polylactic acid polyol with an acid value of 3.5 mgKOH / g.

[0044] 2) Take 500g of the above-mentioned polylactic acid polyol, add 7.5g of ferric chloride into a pressure-resistant reactor, start stirring, then vacuumize, alternate nitrogen replacement for 5 times, then raise the temperature to 50°C, add 1.4g of ethylene oxide (for poly The carboxyl molar number of lactic acid polyol is 1 times), nitrogen pressurization to 0.5MPa, heat preservation at 50°C for 8 hours, vacuumize to remove unreacted ethylene oxide, cool down to below 40°C and take sa...

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Abstract

The invention provides silane modified polylactic acid as well as a preparation method and application thereof. The silane modified polylactic acid can be used for preparing an adhesive with degradability. The invention provides a preparation method of the silane modified polylactic acid, which comprises the following steps: (1) reacting polyether polyol with lactide to prepare polylactic acid polyol; (2) reacting the polylactic acid polyol prepared in the step (1) with an epoxy compound to prepare low-acid-value polylactic acid polyol, and (3) reacting the low-acid-value polylactic acid polyol prepared in the step (2) with alkoxy silane containing isocyanate groups to prepare the silane modified polylactic acid.

Description

technical field [0001] The invention relates to a synthesis method of silane-modified polylactic acid. Background technique [0002] Polylactic acid is a renewable and environmentally friendly bio-based degradable polymer material, which has good biocompatibility, non-toxic and non-irritating advantages. However, due to the presence of ester bonds in the chain segment, its hydrophobicity is enhanced and its biocompatibility is deteriorated. In addition, polylactic acid is a linear polymer, and its chain segment is relatively regular, which has the disadvantages of poor product toughness and poor impact resistance, and its application fields are limited. Therefore, modification of polylactic acid is considered. [0003] Patent CN1043563748B provides a preparation method of aliphatic-polylactic acid multi-block copolymers to obtain copolymers with high elongation at break. The specific method is: firstly react aliphatic glycol compounds and lactide The hydroxyl-terminated po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/664C08G63/85C09J167/04
CPCC08G63/912C08G63/664C08G63/785C09J167/04
Inventor 刘斌秦承群石正阳叶天刘洋殷玲吕树卫王新黎源
Owner WANHUA CHEM GRP CO LTD
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