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biodegradable polymer composition

A biodegradable polyester and biodegradable technology, applied in the field of preparing these polymer compositions, can solve the problem of bubbling instability, shear sensitivity, poor melt strength, polymer melt viscosity, increased scrap rate, increased processing costs, etc. problems, achieve excellent biodegradability and improve processing performance

Inactive Publication Date: 2011-12-14
SETEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although advances have been made in improving the physical and mechanical properties of polysaccharide-containing biodegradable polymers, such polymers generally have poor physical and mechanical properties relative to petroleum-derived polymers
[0010] Moreover, such polymer compositions also have a tendency to suffer from poor processability, especially when converting them into products such as films or sheets
For example, common polyester starch polymer compositions typically exhibit poor processability during blown film
In particular, the polymer composition is prone to bubble instability, excessive film blocking (e.g. self-adhesion), shear sensitivity of the polymer melt, thermal degradation of the polymer melt, volatility changes, melt strength Poor, polymer melt viscosity and other issues, so it has a narrow processing window
Problems in these processes generally increase the scrap rate and reduce the yield of finished products
But these measures either reduce the finished product yield or increase the processing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] Embodiment 1: the preparation of masterbatch

[0115] 35kg of acetate starch (starch acetate) with a moisture content of less than 1wt% (DS is 0.5), 8.5kg of poly(butylene adipate / terephthalate) (PBAT), 14kg of glycerin , 6 kg of sorbitol, 1.2 kg of distilled monoglyceride (GMS), 6 kg of ethylene-acrylic acid copolymer (EAA) (9% acid value, melt flow index=20), 3 kg of ethylene-vinyl acetate ( EVA), 0.2 kg of sodium stearate and 0.12 kg of sodium hydroxide dissolved in a minimum amount of water were melt mixed in a ZSK-65 twin-screw extruder (L / D=48). Before melt blending the components, the solid materials are dry blended in a high speed blender and then the liquid materials are added to distribute all components evenly. The temperature profile of the extruder was set at 100°C / 130°C / 160°C / 160°C / 150°C / 140°C. The screw speed was set at 300 rpm. The extrusion process uses a vacuum of -0.06 to -0.08 bar. The molten polymer is extruded in strands and cut into pellets af...

Embodiment 2

[0116] Embodiment 2: Preparation of biodegradable polymer composition

[0117] First, the master batch prepared in Example 1 containing 30wt%, 52.7wt% of PBAT, 7wt% of polycaprolactone (PCL), 3wt% of polylactic acid (PLA), 2wt% of GMS, 0.3wt% of poly Epoxide ( The composition of ADR-4368) and 5wt% talc was dry blended first, and then melt mixed in a ZSK-65 twin-screw extruder with a rotation speed of 200 rpm. The temperature profile of the extruder was set at 80°C / 130°C / 170°C / 170°C / 160°C / 130°C. The extrusion process uses a vacuum of -0.04 to -0.05 bar. The resulting extrudate was water cooled and cut into pellets and found to have a melt flow index of 7 g / 10 min measured on 2.16 kg of fluid at 190°C.

[0118] The polymer composition prepared according to Example 2 was blown into a film with a thickness of 20 microns on a standard LDPE blown film production line, and the process conditions are shown in the table below.

[0119] Processing Conditions - Blown Film

[0120]...

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Abstract

The invention relates to a biodegradable polymer composition comprising the following components (a)-(f) and / or product(s) formed from a reaction between the components: (a) one or more biodegradable polyesters; (b) polysaccharide; (c) polymer having pendant carboxylic acid groups; (d) transesterification catalyst; (e) polyepoxide; and (f) fatty acid sodium salt.

Description

technical field [0001] The present invention generally relates to biodegradable polymer compositions. In particular, the present invention relates to biodegradable polymer compositions comprising polysaccharides, and to methods of preparing these polymer compositions. Background technique [0002] Disposal of domestic waste has become a serious problem in many industrialized countries. For example, in Europe and Japan there are not many places left for landfill. A very large amount of household waste consists of polymeric materials and there is a concerted effort to introduce polymer recycling technologies to reduce polymer waste to landfill. [0003] However, unlike other materials such as glass, wood and metal, recycling of polymers faces many problems. For example, polymer recycling technologies generally require polymers to be sorted by their chemical composition. In particular, due to the large number of commercially available polymers and their wide variety, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08L63/00C08L67/04C08L3/00C08L67/00
CPCC08L5/00C08L23/08C08J2367/04C08L3/00C08L3/06C08L33/06C08L63/00C08L67/02C08L67/04C08J3/226C08J2300/16C08J2303/06C08L101/16C08G81/00C08L2666/02C08L2666/18C08L67/00C08L3/02C08J3/22
Inventor 陈昌平约翰·沙伊尔斯
Owner SETEC
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