Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of polylactic acid expanded particle and preparation method thereof

A polylactic acid foaming and polylactic acid technology, which is applied in the field of polylactic acid foaming particles and their preparation, can solve the problems of small output, large waste water, easy hydrolysis, etc., and achieves the effects of small capacity, good performance and production cost saving.

Active Publication Date: 2016-04-20
桐乡市聚得科技有限责任公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The patent with the authorized notification number CN101613487B discloses a preparation method of a crystalline high polymer physical foaming material, but this method feeds only 1 / 25 of the volume of the kettle body at one time, and the output is small. There is no release agent in between, and there is no stirring, the particles are easy to stick, and the particles with good dispersibility cannot be obtained.
The application publication number is CN103261299A patent "polylactic acid resin foamed beads and molded products of polylactic acid resin foamed beads", polylactic acid resin particles impregnated with physical foaming agent which are heated together with aqueous medium and dispersant It is released from a closed container in a low-pressure area to make it foam to obtain foamed particles. This method uses a large amount of inorganic release agent and produces a large amount of waste water; although the patent also discloses a rapid pressure release after the use of an inorganic physical foaming agent. Foaming method, although this method does not produce waste water, polylactic acid is easily hydrolyzed in water under high temperature and pressure

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Preparation of small modified polylactic acid particles: 100 parts of polylactic acid selected from Table 1, 5 parts of amorphous α-olefin copolymer (APAO, viscosity (190°C): 50000cP), particle size of 50 mesh , the molecular weight is (weight average molecular weight 800,000) 2 parts of polyethylene micropowder, 1 part of decabromodiphenylethane and 0.1 part of antioxidant 1010, mixed by a high-speed mixer and extruded through an extruder to grow water-cooled strands and cut into pellets 1 ~ 3mm, small particles with a diameter of 0.5 ~ 1.5mm.

[0031] (2) Preparation of expanded particles: Add 100 parts of small modified polylactic acid particles described in step (1) and 200 parts of calcium carbonate with a particle size of 10 mesh into a 3-liter autoclave, start the agitator, and rotate at 600 rpm per minute, start to heat up to 88°C at 3°C ​​per minute, and then introduce carbon dioxide to make the pressure in the kettle reach 7MPa. After holding the pressure ...

Embodiment 2

[0033] (1) Preparation of small modified polylactic acid particles: 100 parts of polylactic acid selected from Table 1, 8 parts of amorphous α-olefin copolymer (APAO, viscosity (190°C): 70000cP), particle size of 100 mesh 0.1 part of polyethylene micropowder with a weight average molecular weight of 800,000, 10 parts of decabromodiphenyl ether, 0.1 part of antioxidant 168 and 0.1 part of antioxidant 1010, mixed by a high-speed mixer and extruded through an extruder to cut into water-cooled strips The grain grows 1-3mm, and the diameter is 0.5-1.5mm.

[0034] (2) Preparation of expanded particles: Add 100 parts of small modified polylactic acid particles described in step (1) and 300 parts of kaolin with a particle size of 50 mesh into a 3-liter autoclave, start the stirrer, and rotate at 600 rpm After 3°C per minute, the temperature was raised to 128°C, and then carbon dioxide was introduced to make the pressure in the autoclave reach 16MPa. After keeping the pressure for 90 m...

Embodiment 3

[0036] (1) Preparation of small particles of modified polylactic acid: 100 parts of polylactic acid selected from Table 1, 10 parts of amorphous α-olefin copolymer (APAO, viscosity (190°C): 9000cP), particle size of 500 mesh , 3 parts of polyethylene micropowder with a weight average molecular weight of 1 million, 20 parts of red phosphorus and 0.4 part of antioxidant 330, mixed by a high-speed mixer and then extruded through an extruder to cut into water-cooled strands and cut into pellets with a growth rate of 1-3mm and a diameter of 0.5-1.5 mm small particles.

[0037](2) Preparation of expanded particles: Add 100 parts of small modified polylactic acid particles described in step (1) and 200 parts of sodium chloride with a particle size of 20 mesh into a 3-liter autoclave, start the agitator, and rotate at 600 Turn per minute, start to heat up to 100°C at 3°C ​​per minute, and then introduce nitrogen to make the pressure in the autoclave reach 10MPa. After maintaining the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle size (mesh)aaaaaaaaaa
densityaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to a polylactic acid foamed particle and a preparation method thereof. The polylactic acid foamed particle consists of polylactic acid, modified resin, a nucleating agent, a fire retardant and an antioxidant in certain parts by weight. A small modified polylactic acid particle is formed through extrusion of a banburying type extruder, wherein the modified resin is a amorphous-state alpha-olefin copolymer (APAO) or petroleum resin; then, the small modified polylactic acid particle and inorganic powder body are put into a high-pressure kettle, a stirrer is started, the temperature in the reaction kettle is controlled to be equal to the melting point of polylactic acid, 7-16 MPa of a physical foaming agent is filled into the reaction kettle, the temperature and the pressure are held for 30-90 minutes, then the polylactic acid particle and the inorganic powder in the kettle can be rapidly discharged under one barometric pressure, the pressure in the high-pressure kettle is kept constant until the polylactic acid particle and the powder body in the kettle are discharged completely; and finally the polylactic acid foamed particle can be obtained through sieving. The polylactic acid foamed particle prepared by the method disclosed by the invention has the advantages that no wastewater is discharged, the powder body can be recycled and the overall production process is green and free of pollution, so the polylactic acid foamed particle has quite good industrial application prospects.

Description

technical field [0001] The invention relates to the technical field of polymer foam materials, and more specifically, the invention relates to polylactic acid foam particles and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a novel biodegradable material made from starch raw materials proposed from renewable plant resources such as corn. The starch raw material is saccharified to obtain glucose, and then fermented by glucose and certain strains to produce high-purity lactic acid, and then synthesize polylactic acid with a certain molecular weight by chemical synthesis. It has good biodegradability and can be completely degraded by microorganisms in nature after use, eventually producing carbon dioxide and water without polluting the environment, which is very beneficial to protecting the environment and is recognized as an environmentally friendly material. World carbon dioxide emissions According to news reports, the global temperatur...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L23/00C08L57/02C08K13/02C08K3/26C08K3/34C08K3/16C08J9/18
Inventor 胡圣飞
Owner 桐乡市聚得科技有限责任公司