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Method for preapring poly3-hydroxy alkyl acid ester/carbondioride-propylene epoxide copolymer/starch terpolymer blend

A technology of hydroxyalkanoate and carbon dioxide is applied in the field of preparation of poly3-hydroxyalkanoate/carbon dioxide-propylene oxide copolymer/starch ternary blend, which can solve the problem of slow crystallization speed, performance change and high price. Expensive and other issues

Inactive Publication Date: 2004-01-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, during the processing and molding process, the crystallization speed is relatively slow. With the prolongation of the storage time, the crystallinity increases and the properties change. The large-sized spherulites formed become stress concentration bodies. Due to the high crystallinity, the spherulites and The amorphous part between the spherulites bears high stress, and the product is easily damaged along these parts
The low crystallization rate often makes PHBV stick together during cooling and film formation, and cannot be separated
The third disadvantage is their relatively low melt strength
These disadvantages make PHB and PHBV difficult to process into thin films
The fourth disadvantage is that they are expensive
However, such blends are still relatively expensive
In addition, their biodegradation rate is relatively slow, similar to PHBV, and this performance still needs to be further improved in many practical applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Get the number-average molecular weight of 40,000g / mole, 70 parts of PPC with a molecular weight distribution index of 3.0, 30 parts of PHBV, 1 part of starch, 5 parts of 1250 mesh talcum powder, 1 part of 1000 mesh boron nitride, four [β-(3,5- Di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol (antioxidant ky-7910) 0.5 parts. Wherein the content of HV in PHBV is 17wt%. The above materials were stirred evenly in a high-speed mixer, extruded with a twin-screw extruder, granulated, and formed by hot pressing to obtain a sheet with a tensile yield strength of 20.3 MPa, a tensile modulus of 606 MPa, and an elongation at break of 59%, energy absorption 595mJ.

Embodiment 2

[0020] Get number-average molecular weight is 140,000g / mole, molecular weight distribution index is 5.0 PPC70 parts, PHBV30 parts, starch 30 parts, 1250 mesh talcum powder 5 parts, 1000 mesh boron nitride 1 part, four [beta-(3,5- Di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol (antioxidant ky-7910) 0.5 part. Wherein the content of HV in PHBV is 0wt%, namely PHB. The above materials were stirred evenly in a high-speed mixer, extruded with a twin-screw extruder, granulated, and formed by hot pressing to obtain a sheet with a tensile yield strength of 31.0 MPa, a tensile modulus of 871 MPa, and an elongation at break of 14%, energy absorption 350mJ.

Embodiment 3

[0022] Get number-average molecular weight and be 96,000g / mole, molecular weight distribution index is 3.9 PPC 70 parts, PHBV30 parts, starch 50 parts, 1250 mesh talcum powder 5 parts, 1000 mesh boron nitride 1 part, four [beta-(3,5 - 0.5 parts of di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol (antioxidant ky-7910). Wherein the content of HV in PHBV is 17wt%. The above materials were stirred evenly in a high-speed mixer, extruded with a twin-screw extruder, granulated, and formed by hot pressing to obtain a sheet with a tensile yield strength of 28.6 MPa, a tensile modulus of 751 MPa, and an elongation at break of 23%, energy absorption 280mJ.

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PUM

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Abstract

The present invention belongs to the preparation method of poly-3-hydroxyalkanate / carbon dioxide-epoxypropane copolymer / starch ternary mixture. The ternary mixture is formed from carbon dioxide epoxypropane copolymer, poly-3-hydroxyalkanate, starch, talcum powder, boron nitride and tetra[beta-(3,5-di-tert-butyl-4- hydroxyphenyl) propanoicacid] pentaerythritol (antioxidant Ky-7910). The said materials are mechanically mixed in high-speed stirring machine, extruded in twin screw extruder machine and granulated. The temp. of melt material is 175-185 deg.C, and the obtained resin of poly-3-hydroxyalkanate / carbon dioxide-epoxypropane copolymer / starch ternary mixture can be used for preparing film, plate material, sheet material and injection-moulded into plastic components.

Description

technical field [0001] The invention belongs to the preparation method of poly 3-hydroxyalkanoate / carbon dioxide-propylene oxide copolymer / starch ternary blend. Background technique [0002] Poly 3-hydroxyalkanoate (PHA), carbon dioxide-propylene oxide copolymer (PPC) and starch are all fully biodegradable polymer materials. [0003] At present, the plastic products widely used by people are synthesized from petroleum resources. Due to the shortage of petroleum resources, the preparation of such materials will face difficulties in the near future. On the other hand, these synthetic polymer solid waste plastics such as disposable packaging bags, garbage bags, food, medicine and other packaging products have brought a huge negative impact on the human ecological environment. Leading to death has also occurred from time to time in recent years. The best way to solve these problems is to replace polyethylene, polypropylene, polystyrene and polyvinyl chloride, which are curren...

Claims

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Application Information

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IPC IPC(8): B29C48/40C08K3/34C08L3/02
CPCB29C48/40
Inventor 李静刘景江
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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