Degradable high polymer material of poplar wood pulp cellulose and its preparation method

A polymer material and cellulose technology, applied in the field of degradable polymer materials and their preparation, can solve the problems of plasticizer migration, unsuitable for degradable plastics, etc., to improve compatibility, reduce phase separation, and improve The effect of toughness and ductility

Inactive Publication Date: 2009-06-10
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used low-molecular-weight plasticizers such as phthalates and phosphates are not suitable for the preparation of degradable plastics due to the harmful characteristics of their decomposition products
The thermoplasticity of cellulose acetate can be improved under the condition of high temperature kneading of dicarboxylic anhydride and monoepoxy compound, but the existence of small molecule plasticizer will inevitably lead to the phenomenon of plasticizer migration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A poplar wood pulp cellulose biodegradable polymer material, comprising 100 parts by mass of a resin mixture and 5-30 parts by mass of a plasticizer. The mass parts of the plasticizer can be selected as 5 parts, 7 parts, and 8 parts. 10 parts, 13 parts, 15 parts, 18 parts, 20 parts, 22 parts, 24 parts, 25 parts, 27 parts, 29 parts, the resin mixture includes cellulose acetate prepared from poplar wood pulp cellulose, and also includes polycaprolactone , Polylactic acid, corn starch, one or a mixture of several, wherein the mass of cellulose acetate is 20-60 parts, for example, 25 parts, 28 parts, 30 parts, 35 parts, 40 parts, 45 parts can be selected , 50 parts, 52 parts, 55 parts, 58 parts, the mass of polycaprolactone is 10-40 parts, for example, it can be selected as 12 parts, 15 parts, 18 parts, 20 parts, 22 parts, 28 parts, 30 parts, 33 parts, 36 parts, 38 parts, the mass of polylactic acid is 10-40 parts, for example, it can be selected as: 13 parts, 16 parts, 19 part...

Embodiment 2

[0025] A method for preparing poplar wood pulp cellulose biodegradable polymer material, including the following steps:

[0026]The first step is the preparation of poplar cellulose acetate: After the poplar wood pulp is uniformly dispersed, glacial acetic acid is added for activation. The activation temperature is 30 to 90°C. The activation temperature can be selected as 35°C, 40°C, 45°C, and 50°C. 60℃, 70℃, 85℃, 88℃, the activation time is 2h-24h, the activation time can be selected as: 2 hours, 4 hours, 5 hours, 8 hours, 9 hours, 11 hours, 12 hours, 14 hours, 18 Hours, 20 hours, 22 hours, 23 hours, then add a mixture of acetic anhydride, glacial acetic acid, and catalyst for esterification. The mass of glacial acetic acid is 1-100 times that of cellulose, for example, 8 times or 15 times. , 20 times, 30 times, 43 times, 52 times, 60 times, 70 times, 82 times, 85 times, 90 times, the catalyst mass is 0.5-15% of poplar cellulose, for example, it can be selected as: 0.8%, 1.2 %, 1...

Embodiment 3

[0031] Weigh 10Kg of poplar wood pulp in a 500L reactor. The jacketed water bath is at 40°C. Under constant stirring, 100Kg of glacial acetic acid is added dropwise to activate the cellulose. After the cellulose is fully swelled, 28.33Kg of acetic acid is added. Anhydride and 0.5Kg catalyst are used for esterification. When the reaction showed a uniform and transparent solution, 12Kg of dilute acetic acid was added to hydrolyze the degree of substitution of the product to 2.3. The solution system obtained at this time is precipitated, filtered, washed, dried and then placed in an oven at 60°C to be dried to a constant weight.

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Abstract

The invention discloses a kind of biodegradable macromolecular poplar wood pulp cellulose, comprising resin mixture and plasticity agent; resin mixture comprises acetyl cellulose prepared by using poplar wood pulp cellulose, and one or several of polycaprolactone, polylactic acid, cornstarch; the invention aslo discloses the preparing method. The method comprising following steps: preapring poplar wood pulp cellulose: dispersing poplar woos pulp, adding glacial acetic acid for activation, adding mixture of acetic anhydride, glacial acetic acid and catalyst for esterification, adding dilute acetic acid for hydrolysis to make acetyl cellulose, feeding resin mixture into twin-screw extruder, adding plasticizing agent by liquid pump into the second- class segment; cooling extrudate, drying, cutting into granulate and getting resin granulate. The invention is characterized by enviroment- friendly, low cost, sound comprehensive property, stable product property and wide spread value.

Description

Technical field [0001] The invention relates to a degradable polymer material and a preparation method thereof, in particular to a poplar wood pulp cellulose degradable polymer material and a preparation method thereof. Background technique [0002] Poplar is a fast-growing wood with low lignin content and high cellulose and hemicellulose content. It is widely used in pulping and papermaking. my country has abundant fast-growing poplar resources. Poplar cellulose has attracted more attention due to its renewable, non-toxic, degradable, and environmentally friendly characteristics. Francesco Degli-Innocenti et al. conducted a composting test on the blend of starch and cellulose. After more than forty days, it was almost completely degraded. [0003] Cellulose is insoluble in water and general organic solvents, and its chemical activity is weak. But after chemical modification, such as esterification to generate cellulose acetate, it can give cellulose good toughness and transparen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L1/12C08K5/11B29C47/40B29B9/12C08L67/04C08L3/02B29C48/40
CPCB29C48/40
Inventor 储富祥金立维王春鹏王海云段丽艳陈日清
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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