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A kind of biodegradable composition and preparation method thereof

A technology of biodegradation and composition, applied in the direction of conjugated synthetic polymer rayon, rayon manufacturing, fiber chemical characteristics, etc., can solve the problems of deterioration of physical properties, high processing requirements, reduced molecular weight, etc., and achieve hydrolysis resistance. and heat-resistant oxygen performance improvement effect

Inactive Publication Date: 2011-12-28
KINGFA SCI & TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] So far, the biodegradable resin composition can not fully meet the aforementioned conditions, and the main problems are: 1. The biodegradation rate of the biodegradable resin composition is unstable under the environmental conditions of recycling
2. The physical properties of the biodegradable resin composition cannot meet the needs of practical applications, the processing requirements are high, and the application range is narrow
3. In common application environments, biodegradable resin compositions degrade quickly due to their poor heat and humidity resistance, hydrolysis resistance and thermal oxygen resistance, often accompanied by a decrease in molecular weight and deterioration of physical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh each component according to the following weight percentages:

[0037] Polylactic acid (PLA) 55

[0038] Poly(butylene adipate co-butylene terephthalate) (PBAT) 43

[0039] Benzoyl Peroxide 2

[0040] According to the above ratio, put the weighed components into the high mixer respectively, first stir at low speed for 5 minutes, then stir at high speed for 3 minutes, mix well and then add them to the twin-screw extruder. The diameter of the extruder is 65mm, long With a diameter ratio of 36:1, it has 9 heating zones and a vacuum exhaust device. The extrusion process selects the following operating conditions:

[0041] Temperature setting: 80 / 150 / 190 / 190 / 190 / 190 / 190 / 190 / 170

[0042] Feeding speed: 100KG / H

[0043] Screw speed: 300RPM

[0044] Vacuum pressure: 0.4 atmosphere

[0045] After the strip extruded from the extruder is made into particles by underwater hot cutting, it is dried in a dehumidifier at 80 degrees for 2 hours to obtain a composition. Acco...

Embodiment 2

[0047] Weigh each component according to the following weight percentages:

[0048] Poly 3-hydroxybutyrate (PHB) 40

[0049] Poly(butylene succinate-co-adipate) (PBSA) 57

[0050] Di-tert-butylperoxydicumene 3

[0051] According to the above ratio, put the weighed components into the high mixer respectively, first stir at low speed for 5 minutes, then stir at high speed for 3 minutes, mix well and then add them to the twin-screw extruder. The diameter of the extruder is 65mm, long With a diameter ratio of 36:1, it has 9 heating zones and a vacuum exhaust device. The extrusion process selects the following operating conditions:

[0052] Temperature setting: 80 / 150 / 190 / 190 / 190 / 190 / 190 / 190 / 170

[0053] Feeding speed: 100KG / H

[0054] Screw speed: 300RPM

[0055] Vacuum pressure: 0.4 atmosphere

[0056] After the strip extrudate of the extruder is made into particles by underwater hot cutting, it is dried in a dehumidifying dryer at 80 degrees for 2 hours to obtain a compos...

Embodiment 3

[0058] Weigh each component according to the following weight percentages:

[0059] Polycaprolactone (PCL) 65

[0060] Polybutylene succinate (PBS) 34

[0061] 1,1-bis(tert-butylperoxy)-3,3,5-trimethylcyclohexane 1

[0062] According to the above ratio, put the weighed components into the high mixer respectively, first stir at low speed for 5 minutes, then stir at high speed for 3 minutes, mix well and then add them to the twin-screw extruder. The diameter of the extruder is 65mm, long With a diameter ratio of 36:1, it has 9 heating zones and a vacuum exhaust device. The extrusion process selects the following operating conditions:

[0063] Temperature setting: 80 / 150 / 190 / 190 / 190 / 190 / 190 / 190 / 170

[0064] Feeding speed: 100KG / H

[0065] Screw speed: 300RPM

[0066] Vacuum pressure: 0.4 atmosphere

[0067] After the strip extrudate of the extruder is made into particles by underwater hot cutting, it is dried in a dehumidifying dryer at 80 degrees for 2 hours to obtain a c...

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Abstract

The invention discloses a biodegradable composition and a preparation method thereof, which consist of a biodegradable homopolyester (A), a biodegradable copolyester (B) and a chain extender (C), the total weight of which is 100 parts by mass Calculated, containing (A+B) is 95.0~99.9 parts and containing C is 0.1~5.0 parts, wherein the ratio of A:B is in the range of 1:9~9:1. The present invention finds that the compounding of biodegradable homopolyester with faster biodegradation rate and biodegradable copolyester with better processability in different proportions can not only endow the composition with proper biodegradation rate, but also improve the composition The physical properties and processing performance can be properly adjusted according to the requirements of different processing and application fields; we also found that by introducing a chain extender with long chain characteristics into the biodegradable resin composition, the combination after chain extension can be avoided It can prevent unnecessary gel phenomenon during processing and improve the heat resistance and stability of the material.

Description

technical field [0001] The invention relates to a biodegradable composition and products such as films, sheets, fibers and injection moldings prepared therefrom. Background technique [0002] General-purpose plastics are widely used in various fields due to their excellent comprehensive properties. They are listed as the four major support materials along with steel, wood, and cement, and their annual usage continues to rise. General-purpose plastics such as polyethylene (PE), polypropylene (PP) and polystyrene (PS) can exist stably in nature for a long time and are difficult to degrade. Therefore, they are difficult to recycle after they are discarded, causing serious pollution to the environment. Biodegradable plastics have become one of the effective ways to solve the problem of plastic waste environmental pollution because of their rapid degradation in the natural environment, which has attracted people's attention, and countries all over the world are competing to deve...

Claims

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Application Information

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IPC IPC(8): C08L67/00C08L67/04C08L67/02C08K5/14D01F8/14D01F1/10
Inventor 焦建徐依斌苑仁旭钟宇科曾祥斌蔡彤旻夏世勇袁志敏
Owner KINGFA SCI & TECH CO LTD
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