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Thermoplastic polyvinyl alcohol-polylactic acid blending material and preparation method thereof

A polyvinyl alcohol and polylactic acid technology, which is applied in the field of modified polyvinyl alcohol blend materials and their preparation, can solve the problems of poor mechanical properties of blend films, inability to recycle by thermal processing, and pollute the environment, and improve compatibility. , Improve mechanical properties and processing properties, the effect of short production cycle

Active Publication Date: 2013-07-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation process of this method, not only will a large amount of organic solvent be used to increase the cost, but also the volatilization of the organic solvent will pollute the environment and be a waste. Recycling by repeated thermal processing, and it is impossible to recover by solution dissolution
In addition, the mechanical properties of the blended film of PVA and PLA prepared by this method are relatively poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Mix 50 parts of polyvinyl alcohol with a degree of polymerization of 1700 and an alcoholysis degree of 88%, and 15 parts of glycerol, and then plasticize it in an oven at 100°C for 2 hours; put the above mixture into a screw extruder and extrude it directly at a temperature of 160°C Extrude and granulate to obtain thermoplastic polyvinyl alcohol; mix the obtained thermoplastic polyvinyl alcohol with 10 parts of polylactic acid with a weight average molecular weight of 80,000, and 0.25 parts of tetrabutyl titanate, and then add them into a screw extruder. Extrude and granulate at 170°C with a screw speed of 15 rpm to obtain a thermoplastic polyvinyl alcohol-polylactic acid blend material.

Embodiment 2

[0035] Mix 80 parts of polyvinyl alcohol with a degree of polymerization of 2000 and a degree of alcoholysis of 99%, and 20 parts of monoglyceride lactate, and then plasticize it in an oven at 115°C for 2 hours; put the above mixture into a screw extruder at a temperature of 170°C and directly Extrude and granulate to obtain thermoplastic polyvinyl alcohol; mix the obtained thermoplastic polyvinyl alcohol with 30 parts of polylactic acid with a weight average molecular weight of 300,000, and 2 parts of tetrabutyl titanate, and then add them into a screw extruder, Extrude and granulate at a temperature of 190°C and a screw speed of 40 rpm to obtain a thermoplastic polyvinyl alcohol-polylactic acid blend material.

Embodiment 3

[0037]Mix 80 parts of polyvinyl alcohol with a degree of polymerization of 500 and a degree of alcoholysis of 88%, and 35 parts of formamide, and then plasticize it in an oven at 120°C for 1 hour; put the above mixture into a screw extruder and extrude directly at a temperature of 160°C , granulation, to obtain thermoplastic polyvinyl alcohol; the obtained thermoplastic polyvinyl alcohol, 30 parts of polylactic acid with a weight average molecular weight of 100,000, and 1 part of zinc acetate are mixed evenly and then added to the screw extruder. At a temperature of 190 ° C, the screw Extrude and granulate at a rotational speed of 50 rpm to obtain a thermoplastic polyvinyl alcohol-polylactic acid blend material.

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Abstract

The invention discloses a thermoplastic polyvinyl alcohol-polylactic acid blending material, which is prepared from 50-90 parts of polyvinyl alcohol, 10-50 parts of polylactic acid, 15-50 parts of plasticizer and 0.25-2 parts of catalyst in a reactive extrusion manner, wherein the tensile strength is 19.1-31.6MPa; and the elongation at break 180-590%. The invention also discloses a preparation method of the thermoplastic polyvinyl alcohol-polylactic acid blending material. A plasticizer is added to the PVA (polyvinyl alcohol), so that the PVA can be subjected to thermoplastic process and then blended with PLA (polylactic acid); and a specific catalyst is added in the blending process. Therefore, melt blending of the PVA and the PLA is achieved; the compatibility is improved; the mechanical property and the processability of the material are greatly improved; and the thermoplastic polyvinyl alcohol-polylactic acid blending material is convenient to process, short in production cycle, low in cost, and easy to achieve industrialization, and does not pollute the environment in the production process.

Description

technical field [0001] The invention belongs to the technical field of modified polyvinyl alcohol blend material and its preparation, and in particular relates to a thermoplastic polyvinyl alcohol-polylactic acid blend material and a preparation method thereof. Background technique [0002] As an environmentally friendly material, polyvinyl alcohol (PVA) has good mechanical properties, flexibility and film-forming properties. However, the main chain of PVA contains a large number of hydroxyl groups, and a large number of hydrogen bonds are formed between molecules and within molecules, so that the melting temperature of PVA is close to its decomposition temperature, and it cannot be processed by common thermoplastic processing methods. People have found through research that adding organic small molecule plasticizers is an effective method to improve the processing performance of PVA thermoplastics, but organic small molecule plasticizers are volatile and easy to precipitate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L67/04C08K5/053C08K5/103C08K5/20B29C47/92B29C48/92
Inventor 王玉忠李洪真陈思翀汪秀丽王云闯
Owner SICHUAN UNIV
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