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Polylactic acid foamed beads and preparation method thereof

A polylactic acid foaming and polylactic acid technology, applied in the field of polylactic acid foaming beads and their preparation, can solve the problems of lack of flexibility and elasticity, low heat distortion temperature, poor heat resistance, etc., and achieve good dimensional stability, Good flame retardant properties, not easy to melt adhesion

Active Publication Date: 2020-04-14
苏州德龙复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the lower heat deformation temperature and slower crystallization rate make its dimensional stability not high; the crystallinity is low, the toughness is poor, the quality is brittle and hard, resulting in its lack of flexibility and elasticity; the poor heat resistance makes its manufacturing The resulting product burns more easily
[0003] Chinese patent CN 101613487 B discloses a method for preparing a crystalline high polymer physical foaming material, but the method has the following disadvantages: that is, the amount of feed is small, and it is difficult to industrialize production; in addition, in the absence of stirring and release agents , the particles are prone to sticking, and it is difficult to obtain particles with good dispersion
Chinese patent CN 104140659A discloses a polylactic acid foamed particle and its preparation method. The patent mixes the inorganic powder and polylactic acid uniformly by stirring, and innovatively uses inorganic filler as a spacer to reduce the friction between the polylactic acid foamed particles. Adhesion, but the powder is used as an isolating agent to isolate polylactic acid. Due to the influence of shape and gravity, the isolation effect of inorganic powder is relatively limited. At the same time, although inorganic powder can prevent polylactic The performance of polylactic acid beads will also be affected by the foamed beads

Method used

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  • Polylactic acid foamed beads and preparation method thereof
  • Polylactic acid foamed beads and preparation method thereof
  • Polylactic acid foamed beads and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The melting point of polylactic acid is 170℃, and the melt index is 5.5g / 10min. Preparation of modified polylactic acid particles: use 100 parts of the above polylactic acid resin, 1 part of attapulgite, 0.3 part of antioxidant 1010, 0.25 part of erucamide, 15 parts of dimethyl phosphate, 2-hydroxyl-4- 0.5 part of methoxybenzophenone and 0.3 part of sodium lauryl sulfate are used to extrude modified polylactic acid particles with a length of 1-4 mm and a diameter of 0.5-2 mm through a high mixer, internal mixer and extruder.

[0042] Preparation of foamed beads: Add 200g of the above modified polylactic acid particles, 1000g of deionized water, 3g of defoamer SN-DEFOAMER 1311, and 5g of chitin successively in a 5L reactor, and start stirring at a stirring speed of 100r / min. Stir for 30 minutes; use foaming gas (carbon dioxide) to discharge the residual air in the kettle, control the temperature in the reaction kettle at 125°C, inject 4MPa foaming gas (carbon dioxide), k...

Embodiment 2

[0044] The melting point of polylactic acid is 170℃, and the melt index is 5.5g / 10min. Preparation of modified polylactic acid particles: use 100 parts of the above polylactic acid resin, 1.5 parts of attapulgite, 0.3 parts of antioxidant 168, 0.25 parts of erucamide, 13 parts of dimethyl phosphate, 2-hydroxy-4 - 0.5 parts of methoxybenzophenone, 0.3 parts of sodium dodecylbenzenesulfonate, extrude modified polylactic acid with a length of 1-4mm and a diameter of 0.5-2mm through a high mixer, internal mixer, and extruder particle.

[0045] Preparation of foamed beads: Add 200g of the above modified polylactic acid particles, 1500g of deionized water, 3g of defoamer SN-DEFOAMER 1311, and 6g of chitin in a 5L reactor in turn, and start stirring at a stirring speed of 150r / min. Stir for 45 minutes; use foaming gas (carbon dioxide) to discharge the residual air in the kettle, control the temperature in the reaction kettle at 115°C, inject 6MPa foaming gas (carbon dioxide), keep t...

Embodiment 3

[0047] The melting point of polylactic acid is 160℃, and the melt index is 5g / 10min. Preparation of modified polylactic acid particles: use 100 parts of the above polylactic acid resin, 1.2 parts of attapulgite, 0.4 parts of antioxidant 1010, 0.35 parts of stearic acid amide, 13 parts of dimethyl phosphate, 2-hydroxy- 0.6 parts of 4-methoxybenzophenone and 0.3 parts of sodium oleate are used to extrude modified polylactic acid particles with a length of 1-4 mm and a diameter of 0.5-2 mm through a high mixer, internal mixer and extruder.

[0048] Preparation of foamed beads: Add 150 g of the above modified polylactic acid particles, 800 g of deionized water, 1.6 g of defoamer SN-DEFOAMER 1311, and 6 g of chitin in turn in a 3L reactor and start stirring at a stirring speed of 100 r / min , Stir for 45 minutes; use foaming gas (carbon dioxide) to discharge the residual air in the kettle, control the temperature in the reaction kettle at 115°C, inject 9MPa foaming gas (carbon dioxi...

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Abstract

The invention discloses polylactic acid foamed beads and a preparation method thereof. The polylactic acid foamed beads are composed of polylactic acid, a nucleating agent, an antioxidant, a lubricant, a flame retardant, an ultraviolet absorbent and a foaming stabilizer. The preparation method comprises following steps: modified polylactic acid particles are obtained by treatment using a high-speed mixer and an internal mixer, and extrusion by using an extruder; then the modified polylactic acid particles, a dispersion medium, a defoaming agent and a dispersing aid are introduced into a high-pressure reaction kettle, stirring is started, residual air in the kettle is discharged by using foaming gas, the foaming gas is injected, and sieving is carried out to obtain polylactic acid foamed beads. The product provided by the invention has good flame retardance, weather resistance, toughness and small shrinkage rate. When the foamed product is used for packaging and transporting objects, the surfaces of the objects are not prone to being damaged by vibration, and the foaming product is not prone to generating scraps in the cutting process. The polylactic acid foamed beads are not easy to melt and adhere, and a foaming product prepared from the foaming bead has the characteristic of uniform foaming and is beneficial to industrial production.

Description

technical field [0001] The invention relates to the field of polylactic acid foamed beads, in particular to a polylactic acid foamed bead and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is an excellent polymer material with complete biodegradability, due to its many excellent properties, such as good biocompatibility, environmental friendliness, energy economy and thermoplastic molding etc., so that in the process of processing, it becomes the best substitute for petroleum-based polymer materials that may cause pollution after reaction, and thus gradually becomes one of the important materials for scientific research and study by domestic and foreign processing application fields and scholars in recent years. As a kind of thermoplastic aliphatic polyester, the raw materials of PLA are natural substances such as corn and sugarcane, which are prepared by chemical polymerization after fermentation. PLA-based resins can be molded with most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L5/08C08K13/02C08K3/34C08K5/523C08K5/132C08K5/42C08J9/16C08J9/12
CPCC08J9/16C08J9/0061C08J9/0033C08J9/0038C08J9/0066C08J9/0095C08J9/0023C08J9/122C08J2367/04C08J2405/08C08J2203/06
Inventor 陈娣平
Owner 苏州德龙复合材料有限公司
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