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Method for preparing environment-friendly polylactic-acid composite material with high tensile strength

A technology of high tensile strength and composite materials, which is applied in the field of polymer composite material preparation, can solve the problems of low tensile strength and achieve the effects of increased tensile strength, excellent biodegradability, and promotion of dependence

Active Publication Date: 2018-02-13
东阳市凯达塑业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention: Aiming at the problem of low tensile strength of the current polylactic acid composite material, a preparation method of an environment-friendly polylactic acid composite material with high tensile strength is provided

Method used

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  • Method for preparing environment-friendly polylactic-acid composite material with high tensile strength

Examples

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example 1

[0023]Weigh 80g of potatoes and put them into a grinder to grind for 10 minutes. After grinding, potato powder is obtained. Add the potato powder to the fermenter, then add pig manure and biogas slurry of the same quality as the potato powder and mix, and ferment at 35°C for 10 days. Remove the filter residue to obtain a lactate solution, add 100mL of sulfuric acid solution with a mass fraction of 30% to the lactate solution, mix and react for 12min, and obtain self-made lactic acid after filtration, add 20mL absolute ethanol and 12mL mass fraction to the self-made lactic acid to obtain Mix 30% hydrogen peroxide, and polycondense at 30°C for 1 hour to obtain self-made polylactic acid. For later use, weigh 8g of salicylic acid powder and put it into a three-necked flask filled with 30mL of ether, then add 3mL of boron trifluoride ether to mix. Heating and reacting under reflux for 2h, after cooling to room temperature, washing with 30% sodium chloride solution for 6 times, then ...

example 2

[0025] Weigh 90g of potatoes and put them into a grinder to grind for 11 minutes. After grinding, potato powder is obtained. Add the potato powder to the fermenter, then add pig manure and biogas slurry of the same quality as the potato powder to mix, and ferment at 40°C for 11 days. Remove the filter residue to obtain a lactate solution, add 110mL of sulfuric acid solution with a mass fraction of 30% to the lactate solution, mix and react for 14min, and obtain self-made lactic acid after filtration, add 30mL absolute ethanol and 14mL mass fraction to the self-made lactic acid to obtain Mix 30% hydrogen peroxide, and polycondense at 40°C for 1.5h, which is self-made polylactic acid. For later use, weigh 9g of salicylic acid powder and put it into a three-necked flask filled with 40mL of ether, then add 4mL of boron trifluoride in ether to mix , heated and reacted for 3 hours under reflux, and after cooling to room temperature, washed 7 times with 30% sodium chloride solution, t...

example 3

[0027] Weigh 100g of potatoes and put them into a grinder to pulverize for 12 minutes. After pulverization, potato powder is obtained. Add the potato powder to the fermenter, then add pig manure and biogas slurry of the same quality as the potato powder to mix, and ferment at 45°C for 12 days. Remove the filter residue to obtain a lactate solution, add 120mL of sulfuric acid solution with a mass fraction of 30% to the lactate solution, mix and react for 16min, and obtain self-made lactic acid after filtration, add 40mL absolute ethanol and 16mL mass fraction to the self-made lactic acid to obtain Mix 30% hydrogen peroxide, and polycondense at 50°C for 2 hours to obtain self-made polylactic acid. For later use, weigh 10g of salicylic acid powder and put it into a three-necked flask filled with 50mL of ether, and then add 5mL of boron trifluoride ether to mix. Heating and reacting under reflux for 4h, after cooling to room temperature, washing with 30% sodium chloride solution fo...

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Abstract

The invention discloses a method for preparing an environment-friendly polylactic-acid composite material with high tensile strength and belongs to the technical field of preparation of macromolecularcomposite materials. According to the method, firstly, polylactic acid is modified with dimerized salicylide crystals, a benzene ring is introduced into a principal chain after modification, the principal chain of the polylactic acid is hardened due to the benzene ring, and thus, mechanical properties of the polylactic acid are improved; then, starch is modified, and the dependence between the modified starch and the modified polylactic acid in an entire compound system is enhanced, so that the cohesive force between two phases of the starch and polylactic acid composite material is increased; then, glass fibers are added into polylactic acid, staggered polylactic acid particle chains are connected among the glass fibers, the glass fibers and the polylactic acid jointly bear a load and are used for modifying a composite material as filler, and the tensile strength of the composite material is further improved; zinc oxide has biological affinity and has a composite material skeleton regenerating promoting effect as a zinc supplement, so that the composite material is economical and environmentally friendly and can have a broad application prospect.

Description

technical field [0001] The invention relates to the technical field of polymer composite material preparation, in particular to a method for preparing an environment-friendly polylactic acid composite material with high tensile strength. Background technique [0002] Most of the currently used polymer materials such as PE, PP, PVC, PS, etc. have good stability and are difficult to degrade in nature, which causes great pollution to the environment. Therefore, people attach great importance to the study of biodegradable materials. . Among them, polylactic acid (PLA), known as "green plastic", has been intensively studied due to its good biodegradability and biocompatibility. [0003] Polylactic acid (PLA) is a new generation of fully degradable polymer materials developed rapidly in the 1990s. It is made of L-lactic acid, a product of microbial fermentation, and polymerized by chemical synthesis. It is a thermoplastic aliphatic resin. kind of. Polylactic acid has excellent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L51/02C08K13/06C08K9/04C08K7/14C08K3/22C08F251/00C08F220/06C08G63/08
Inventor 陈友宝杨立军张淑娴
Owner 东阳市凯达塑业有限公司
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