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Preparation method and application of crosslinked starch, polycaprolactone and polylactic acid mixture

A technology of polycaprolactone and cross-linked starch, which is applied in the direction of anaerobic digestion treatment, etc., can solve the problems of excessive dosing and difficulty in controlling the carbon-nitrogen ratio, reduce the cost of denitrification, shorten the start-up time, and overcome the carbon source investment. The effect of increasing the amount is not easy to control

Inactive Publication Date: 2013-04-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common liquid carbon source biological denitrification denitrification process has an inherent defect: the carbon-nitrogen ratio is difficult to control, and there is a risk of excessive dosage
Previous research mainly focused on the field of degradable plastics, and there is no report on the blend of cross-linked starch and degradable synthetic materials for denitrification purposes.

Method used

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  • Preparation method and application of crosslinked starch, polycaprolactone and polylactic acid mixture
  • Preparation method and application of crosslinked starch, polycaprolactone and polylactic acid mixture
  • Preparation method and application of crosslinked starch, polycaprolactone and polylactic acid mixture

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Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of cross-linked starch, polycaprolactone and polylactic acid blend is carried out according to the following steps:

[0022] (1) Starch crosslinking: add 10g starch, 30g water and 0.7g sodium chloride in the reactor, adjust the pH to 9.5 with 0.5mol / L sodium hydroxide solution (adding 0.7g) under mechanical stirring, and heat up to Slowly add 0.8g of epichlorohydrin after 50°C, react at constant temperature for 8 hours, filter, wash, and dry to obtain cross-linked starch;

[0023] (2) Preparation of crosslinked starch, polycaprolactone and polylactic acid blend: 35g crosslinked cornstarch, 25g polycaprolactone (molecular weight 60000), 25g polylactic acid (molecular weight 40000), 11g glycerin, 4g water After stirring evenly, extrude and granulate in a twin-screw extruder at 120-175°C.

Embodiment 2

[0025] The preparation method of cross-linked starch, polycaprolactone and polylactic acid blend is carried out according to the following steps:

[0026] (1) Starch crosslinking: add 10g starch, 30g water and 0.7g sodium chloride in the reactor, adjust the pH to 9.5 with 0.5mol / L sodium hydroxide solution (adding 0.7g) under mechanical stirring, and heat up to Slowly add 0.8g of epichlorohydrin after 50°C, react at constant temperature for 8 hours, filter, wash, and dry to obtain cross-linked starch;

[0027] (2) Preparation of crosslinked starch, polycaprolactone and polylactic acid blend: 46g crosslinked tapioca starch, 14g polycaprolactone (molecular weight 40000), 14g polylactic acid (molecular weight 80000), 15g glycerin, 5g water After mixing 5g of wood flour and 1g of KH-560 silane coupling agent evenly, extrude and granulate in a twin-screw extruder at 120-175°C.

Embodiment 3

[0029] The preparation method of cross-linked starch, polycaprolactone and polylactic acid blend is carried out according to the following steps:

[0030] (1) Starch crosslinking: add 10g starch, 30g water and 0.7g sodium chloride in the reactor, adjust the pH to 9.5 with 0.5mol / L sodium hydroxide solution (adding 0.7g) under mechanical stirring, and heat up to Slowly add 0.8g of epichlorohydrin after 50°C, react at constant temperature for 8 hours, filter, wash, and dry to obtain cross-linked starch;

[0031] (2) Preparation of crosslinked starch, polycaprolactone and polylactic acid blend: 23.04g crosslinked cornstarch, 23.04g cornstarch, 14.11g polycaprolactone (molecular weight 40000), 14.11g polylactic acid (molecular weight 80000), 14.81g of glycerin, 4.94g of water, 4.95g of wood flour and 1g of KH-560 silane coupling agent were stirred evenly, and extruded and granulated in a twin-screw extruder at 155°C.

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Abstract

The invention discloses a preparation method and application of a crosslinked starch, polycaprolactone and polylactic acid mixture, which belongs to the technical field of environment protection. The preparation method comprises the following steps of: adding auxiliary agents such as a plasticizing agent and the like into crosslinked starch, polycaprolactone and polylactic acid which serve as rawmaterials; stirring and mixing uniformly; extruding by using a double-screw extruder at a time; and pelleting to obtain a product. The crosslinked starch, polycaprolactone and polylactic acid mixturecan be simultaneously used as a denitrification carbon source and a biomembrane carrier during water treatment, overcomes the defect that the adding amount of the carbon source is difficult to regulate and control in the conventional denitrification process, and has higher adaptability to inflow water dissolved oxygen concentration and pH; simultaneously, low-cost starch is added into the mixed carbon source, so that denitrification cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a preparation method and application of a blend of crosslinked starch, polycaprolactone and polylactic acid. Background technique [0002] With the strict implementation of pollution interception and source control, and strengthening the operation and management of sewage treatment plants, water pollution problems characterized by low organic pollution and high nitrogen emissions will appear. For example, the effluent of the sewage treatment plant that reaches the first-class A standard is used as the ecological replenishment of the water environment, and it comes from the confluence of surface runoff and non-point sources in the urban rainy season. If this kind of low-pollution water with total nitrogen exceeding the standard, mainly nitrate nitrogen, directly flows into lakes and reservoirs without further treatment, it may lead to eutrophication of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L3/08C08L3/02C08L67/04C08L97/02C08B31/08C02F3/28
Inventor 王建龙沈志强
Owner TSINGHUA UNIV
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