Method for preparing sustained-release carbon material by using low molecular weight polylactic acid

A slow-release carbon material and low molecular weight technology, applied in the field of water treatment, to achieve strong operability, low cost, and overcome microbial nutritional imbalance

Inactive Publication Date: 2011-02-16
YIXING HUIYANG ENVIRONMENT PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, polylactic acid, because its degradation product is lactic acid, is a substance required by the normal metabolism of the human body, and has the characteristics of non-toxicity and no side effects. There is no report on the research on releasing the material skeleton

Method used

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  • Method for preparing sustained-release carbon material by using low molecular weight polylactic acid
  • Method for preparing sustained-release carbon material by using low molecular weight polylactic acid
  • Method for preparing sustained-release carbon material by using low molecular weight polylactic acid

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Weigh 20g per portion, select polylactic acid with a molecular weight of 20,000, polylactic acid and starch in a mass ratio of 8:2, pulverize in a high-speed pulverizer, stir evenly, and slowly add to the temperature at a constant speed In an injection molding machine at 100-180°C, extrude into a cylinder with a diameter of 0.3-0.8 cm, and after cooling at room temperature, a short cylinder with a length of 1.0-4.0 cm is formed.

Embodiment 2

[0023] Example 2: Weigh 20g per portion, select polylactic acid with a molecular weight of 20,000, polylactic acid and starch in a mass ratio of 7:3, pulverize in a high-speed pulverizer, stir evenly, and add slowly and uniformly to the temperature. In an injection molding machine at 100-180°C, extrude into a cylinder with a diameter of 0.3-0.8 cm, and after cooling at room temperature, a short cylinder with a length of 1.0-4.0 cm is made.

Embodiment 3

[0024] Example 3: Weigh 20g per portion, select polylactic acid with a molecular weight of 20,000, polylactic acid and starch in a mass ratio of 6:4, pulverize in a high-speed pulverizer, stir evenly, and slowly add to the temperature at a constant rate In an injection molding machine at 100-180°C, extrude into a cylinder with a diameter of 0.3-0.8 cm, and after cooling at room temperature, a short cylinder with a length of 1.0-4.0 cm is made.

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Abstract

The invention discloses a method for preparing a sustained-release carbon material by using low molecular weight polylactic acid. The material is prepared by the following steps of: crushing biodegradable polylactic acid and cheap starch in a certain ratio and stirring the crushed materials uniformly, adding the mixture into an injection molding machine heated to between 100 and 180 DEG C, performing injection molding on the mixture, and then cooling and curing the mixture. The material has the properties of sustained release and no secondary pollution, and can solve the problem that imbalanced microbial nutrition caused by non-uniform carbon source supply in the current water treatment field causes decline of metabolic function so as to cause decline of treatment efficiency; the method also can be used on the aspects of sustained-release pesticide, chemical fertilizer and the like; and the process is simple, and the cost is relatively low because other auxiliary substances are not needed.

Description

Technical field [0001] The invention relates to the field of water treatment, in particular to a method for preparing a slow-release carbon material from low molecular weight polylactic acid prepared by melt polymerization. Background technique [0002] Since carbon source supplementation can provide sufficient nutrients for the growth and metabolism of microorganisms, it has gradually become a research focus in the field of water treatment. Currently, groundwater denitrification, wastewater treatment, anaerobic nitrification, and denitrification stages have insufficient carbon source supplement or unstable supply, which has become an important factor restricting the efficiency of biological nitrogen removal. To obtain an ideal nitrogen removal effect, it is necessary to consider the addition of carbon sources. Supplement the requirement of electron donor for denitrification and denitrification. Regarding carbon source supplement research, the most mature and most used are mainl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F3/34C02F3/28
CPCY02W10/10
Inventor 汪群慧刘建国王爽李朋田艳丽
Owner YIXING HUIYANG ENVIRONMENT PROTECTION TECH
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