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Polylactic acid injection molding method

A technology of injection molding and polylactic acid, which is applied in the field of polylactic acid, can solve the problems that hinder the development of polylactic acid, such as wide application of polylactic acid resin, high brittleness, and insufficient toughness, so as to promote catalytic polycondensation and depolymerization, improve reactivity, and strong dehydration Effect

Inactive Publication Date: 2020-03-31
无锡御束生物材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the polylactic acid prepared by the existing polylactic acid injection molding method has high hardness, it has high brittleness and insufficient toughness, which hinders the development of polylactic acid industry and the wide application of polylactic acid resin.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A polylactic acid injection molding method is characterized in that the method comprises the following steps:

[0034] Step 1, take 0.5g of the first initiator, 10g of polylactic acid intermediate and 60mL of dichloromethane and mix evenly, add 0.08g of N,N-dimethylethanolamine, seal and stir at 30°C for 3 hours, then add 0.1g of benzene Formic acid was stirred and dissolved, precipitated in ethylenediaminetetraacetic acid, recrystallized twice, and vacuum-dried to obtain the primary product of polylactic acid.

[0035] Wherein, the preparation method of polylactic acid intermediate is:

[0036] Weigh 30g of lactic acid and 0.15g of trimethyl orthoformate into a reaction flask, stir and react at room temperature for 3h to obtain product M; wherein, the stirring speed is 300rpm;

[0037] Add 1.4g antimonous chloride to the product M, stir evenly, distill under reduced pressure at 40°C and 0.1Mpa for 2h, depolymerize, dry, and recrystallize to obtain a polylactic acid in...

Embodiment 2

[0048] A polylactic acid injection molding method is characterized in that the method comprises the following steps:

[0049] Step 1, take 0.5g of the first initiator, 10g of polylactic acid intermediate and 60mL of dichloromethane and mix evenly, add 0.08g of N,N-dimethylethanolamine, seal and stir at 30°C for 3 hours, then add 0.1g of benzene Formic acid was stirred and dissolved, precipitated in ethylenediaminetetraacetic acid, recrystallized twice, and vacuum-dried to obtain the primary product of polylactic acid.

[0050] Wherein, the preparation method of polylactic acid intermediate is:

[0051] Weigh 30g of lactic acid and 0.15g of trimethyl orthoformate into a reaction flask, stir and react at room temperature for 3h to obtain product M; wherein, the stirring speed is 300rpm;

[0052] Add 1.4g of antimonous chloride to the product M, stir evenly, distill under reduced pressure at 50°C and 0.1Mpa for 2h, depolymerize, dry, and recrystallize to obtain a polylactic acid...

Embodiment 3

[0063] A polylactic acid injection molding method is characterized in that the method comprises the following steps:

[0064] Step 1, take 0.5g of the first initiator, 10g of polylactic acid intermediate and 60mL of dichloromethane and mix evenly, add 0.08g of N,N-dimethylethanolamine, seal and stir at 30°C for 3 hours, then add 0.1g of benzene Formic acid was stirred and dissolved, precipitated in ethylenediaminetetraacetic acid, recrystallized twice, and vacuum-dried to obtain the primary product of polylactic acid.

[0065] Wherein, the preparation method of polylactic acid intermediate is:

[0066] Weigh 30g of lactic acid and 0.15g of trimethyl orthoformate into a reaction flask, stir and react at room temperature for 3h to obtain product M; wherein, the stirring speed is 300rpm;

[0067] Add 1.4g of antimony chloride to the product M, stir evenly, distill under reduced pressure at 45°C and 0.1Mpa for 2h, depolymerize, dry, and recrystallize to obtain a polylactic acid i...

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Abstract

The invention relates to the field of polylactic acid and particularly relates to a polylactic acid injection molding method. The method includes: 1, performing polycondensation on lactic acid to obtain a polylactic acid intermediate, and performing ring opening reaction on the polylactic acid intermediate to prepare a polylactic acid initial product; 2, polymerizing the polylactic acid initial product and 2-methyl-1,3-butadiene to obtain tri-blocked polylactic acid; 3, grafting the glycine on the tri-blocked polylactic acid by using a third initiator to obtain modified tri-blocked polylacticacid; 4, drying the modified tri-blocked polylactic acid in a drying box; 5, performing extrusion and granulation and injection molding on an injection molding machine. The invention solves the problem that polylactic acid prepared through conventional injection molding methods is high in brittleness and insufficient flexibility although the hardness is high. The method is beneficial to development of polylactic acid industry and wide application of polylactic acid resin.

Description

technical field [0001] The invention relates to the field of polylactic acid, in particular to a polylactic acid injection molding method. Background technique [0002] Polylactic acid is a polymer made of lactic acid as the main raw material. It can be synthesized through renewable plant resources-corn starch, tapioca starch, plant fiber, biological sugar, etc. The synthesis energy consumption is low, no pollution, and is conducive to ecology recycling; polylactic acid has good biodegradability, will not release toxic gases such as nitrogen and sulfide after incineration, and can be completely degraded by microorganisms in nature after landfilling, eventually producing carbon dioxide and water, without polluting the environment; Lactic acid has good processing properties and mechanical properties, which are comparable to general-purpose plastics polystyrene and polyethylene terephthalate, and is expected to become a substitute for petroleum-based general-purpose plastics. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08G63/08C08G63/87B29C45/00B29K67/00
CPCB29C45/0001B29K2067/046C08F293/00C08G63/08C08G63/87
Inventor 王辉王庆
Owner 无锡御束生物材料科技有限公司
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