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Polylactic acid green nano-nucleating temperature resistance agent and preparation method of same

A technology of polylactic acid and temperature-resistant agent, which is applied in the field of polylactic acid green nano-nucleation temperature-resistant agent and its preparation, can solve the problems of poor heat resistance, slow crystallization rate, and increased cost of production products, so as to improve temperature resistance and Dimensional stability, improved crystallinity and heat resistance, good heterogeneous nucleation effects

Active Publication Date: 2019-03-01
江苏圣一纳米科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] PLA material has high strength, good fluidity, easy molding, especially good biodegradability, and is an environmentally friendly material, but PLA material also has shortcomings, such as slow crystallization rate, poor heat resistance, and high brittleness.
Due to the low crystallization rate of PLA materials, its injection products need to go through the in-mold crystallization process to meet the performance requirements, and this technical process has low production efficiency and high energy consumption, which increases the cost of production products; due to the poor heat resistance of PLA materials , which limits its application in the field of disposable products, such as water cups, disposable tableware and other heat-resistant products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Air-dry attapulgite and bentonite raw ore until the water weight content is ≤20%, then mix them, coarsely crush them into small particles with a crusher, and control the particle diameter at 2-4mm;

[0029] Step 2, spraying the small particles with a concentration of 5wt% sodium polyacrylate / sodium pyrophosphate composite dispersant solution (the weight ratio of sodium polyacrylate and sodium pyrophosphate is 1:1, the molecular weight of sodium polyacrylate is about 3000, compound The consumption of dispersing agent is equivalent to the 1.2wt% of described mineral clay weight), after fully mixing, carry out extruding into flake mixture with strong differential speed three-roller machine;

[0030] Step 3, put the flake mixture and water into a pulper, stir for 60 minutes, and pass the slurry through a 325-mesh high-frequency vibrating screen with ultrasonic waves;

[0031] Step 4, put the above-mentioned sieved slurry into an emulsifier, heat at 80-90°C, add ligh...

Embodiment 2

[0035] Step 1: Air-dry attapulgite and bentonite raw ore until the water weight content is ≤20%, then mix them, coarsely crush them into small particles with a crusher, and control the particle diameter at 2-4mm;

[0036] Step 2, the small particle spraying concentration is 5wt% sodium polyacrylate / sodium pyrophosphate composite dispersant solution (the weight ratio of sodium polyacrylate and sodium pyrophosphate is 2:1, the molecular weight of sodium polyacrylate is about 4000, compound The consumption of dispersing agent is equivalent to 1.5wt% of described mineral clay weight), after fully mixing, carry out extruding into flake mixture with strong differential speed three-roller machine;

[0037] Step 3, put the flake mixture and water into a pulper, stir for 60 minutes, and pass the slurry through a 325-mesh high-frequency vibrating screen with ultrasonic waves;

[0038] Step 4, put the above-mentioned sieved slurry into an emulsifier, heat at 80-90°C, add light magnesium ...

Embodiment 3

[0042] Step 1: Air-dry attapulgite and bentonite raw ore until the water weight content is ≤20%, then mix them, coarsely crush them into small particles with a crusher, and control the particle diameter at 2-4mm;

[0043] Step 2, spraying the small particles with a concentration of 5wt% sodium polyacrylate / sodium pyrophosphate composite dispersant solution (the weight ratio of sodium polyacrylate and sodium pyrophosphate is 1:2, the molecular weight of sodium polyacrylate is about 5000, compound The consumption of dispersing agent is equivalent to 2wt% of described mineral clay weight), after fully mixing, carry out extruding into flake mixture with strong differential speed three-roller;

[0044] Step 3, put the flake mixture and water into a pulper, stir for 60 minutes, and pass the slurry through a 325-mesh high-frequency vibrating screen with ultrasonic waves;

[0045] Step 4, put the above-mentioned sieved slurry into an emulsifier, heat at 80-90°C, add light magnesium ox...

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Abstract

The invention discloses a polylactic acid green nano-nucleating temperature resistance agent and a preparation method of same. The temperature resistance agent includes mineral clay, a composite dispersant, alkali and composite starch, wherein the mineral clay is a mixture of attapulgite and bentonite, the composite dispersant is a mixture of sodium polyacrylate and sodium pyrophosphate, and the composite starch is a mixture of caltrop starch and potato starch. The preparation method includes: sun-drying the attapulgite and bentonite until water weight percentage is not more than 20%, mixing the attapulgite and bentonite, coarse-curing the mixture into mineral clay granules, spraying the composite dispersant solution, and compressing the mixture into a sheet-like mixture; mixing and stirring the sheet-like mixture with water to make slurry, sieving and emulsifying the slurry, and performing high speed shearing to obtain an emulsion; performing cyclone classification and dehydration, transferring the mixture into a drying-type crushing and surface modifying machine, and adding the composite starch for surface modification; crushing the modified material to obtain the polylactic acidgreen nano-nucleating temperature resistance agent, which is easy to disperse completely in polylactic acid and provides the polylactic acid with excellent heterogeneous nucleation, thereby improvingcrystalline degree of the polylactic acid and significantly improving the temperature resistance thereof.

Description

technical field [0001] The invention relates to the technical field of polylactic acid preparation, in particular to a polylactic acid green nano-nucleation temperature-resistant agent and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a new type of biodegradable material with good thermal stability. The processing temperature is 170-230°C. It has good solvent resistance and can be processed in various ways, such as extrusion, spinning, Biaxial stretching, injection blow molding. In addition to being biodegradable, products made of polylactic acid have good biocompatibility, gloss, transparency, and hand feeling, so they can be widely used in a wide range of fields such as construction, agriculture, forestry, papermaking, and medical and health care, as packaging Materials, disposables, fibers and nonwovens, etc. [0003] Polylactic acid was first obtained in 1932 when DuPont Carothers heated lactic acid under vacuum conditions to obta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L3/02C08L33/02C08K3/34C08K3/32
CPCC08K2003/324C08K2201/003C08K2201/014C08L67/04C08L2201/08C08L2205/025C08L2205/035C08L2205/24C08L3/02C08L33/02C08K3/346C08K3/32
Inventor 沈培友梁丽芹蒋东阳王志刚王运军邵佳敏许庆华
Owner 江苏圣一纳米科技有限公司
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