Method for preparing composite modified starch for biodegrading plastic

A technology of composite modified starch and biodegradable plastics, which is applied in the field of composite modified starch, can solve problems such as difficult control of degradation accuracy, conflicts between industry and people for food, and decline in mechanical properties in use, so as to improve the lack of uniformity of reaction and production cost. Low, stable performance

Active Publication Date: 2013-04-17
广西农垦明阳生化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Foreign products are good in terms of mechanical properties and biodegradability, but they are expensive
However, some domestic products generally have the following problems: the use of mechanical properties is reduced; the production cost is high; the degradation accuracy is difficult to control; starch-based degradable plastics use starch produced from grain as raw material, and conflicts between industry and people compete for food, etc.

Method used

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  • Method for preparing composite modified starch for biodegrading plastic
  • Method for preparing composite modified starch for biodegrading plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 100 parts by weight of cassava dry starch, add 0.3 parts by weight of activator solid sodium hydroxide (ground into powder), and perform activation treatment at 95-100° C. for 30 minutes. Then add 1 weight part of esterification agent sodium trimetaphosphate, and carry out esterification reaction at 120-125°C for 1 hour. Add 2.5 parts by weight of solid medicament coupling agent titanate to the product after esterification reaction, and carry out phase encapsulation reaction under a fully stirred state, the reaction temperature is 125-130° C., and the reaction time is 50 minutes. Finally, it is cooled to below 30°C through the cold air treatment system, and then sieved through a 60-mesh sieve, and packed according to the quantity to obtain the finished product.

Embodiment 2

[0033] Weigh 100 parts by weight of cassava dry starch, add 0.8 parts by weight of activator solid sodium hydroxide (ground into powder), and perform activation treatment at 95-100° C. for 30 minutes. Then 1.2 parts by weight of esterifying agent sodium trimetaphosphate was added, and the esterification reaction was carried out at 120-125° C. for 1 hour. Add 3.5 parts by weight of solid drug coupling agent aluminate to the product that has undergone the esterification reaction, and carry out phase encapsulation reaction under a fully stirred state. The reaction temperature is 125-130° C., and the reaction time is 40 minutes. Finally, it is cooled to room temperature through a cold air treatment system, and then sieved through a 60-mesh sieve, and packed according to the quantity to obtain the finished product.

Embodiment 3

[0035] Weigh 100 parts by weight of tapioca starch, add 1.0 parts by weight of activator solid potassium hydroxide (ground into powder) in the early stage of the reaction, and perform activation pretreatment at 95-100 ° C for 30 minutes; then add 1.2 parts by weight Esterification agent sodium hexametaphosphate, carry out esterification reaction at 120-125°C for 1 hour; then add 3 parts by weight of solid drug coupling agent borate, and carry out phase encapsulation reaction in a fully stirred state, the reaction temperature The temperature is 125-130°C, and the reaction time is 40-50 minutes; finally, it is cooled to below 30°C through a cold air treatment system; it is sieved through a 60-mesh sieve, and packed according to the quantity to obtain the finished product.

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Abstract

The invention provides a method for preparing composite modified starch for biodegrading plastic, comprising: adding an activator in dry starch, for pretreatment under 95-100 DEG C for 30min; adding an esterification reagent into the starch after activation, for making esterification reaction under 120-125 DEG C for 1h, wherein the whole press is carried out in a solid phase state; adding a solid coupling agent into the material after esterification, for making a phase coating reaction in case of stirring under 125-130 DEG C for 40-50min, wherein the whole press is carried out in a solid phase state; cooling the material until to room temperature, screening the material with 60 mesh sieves, and then packaging the material to obtain the finished product.

Description

technical field [0001] The invention relates to a compound modified starch, in particular to a method for preparing the compound modified starch used in biodegradable plastics. Background technique [0002] With the rapid development of my country's economy, the scale of petroleum synthetic plastics industry is also expanding rapidly, and plastic products are used in more and more industries. In 2010, the world's plastic consumption is estimated to be 328 million tons, and China's plastic consumption is estimated to exceed 56 million tons. Plastic products provide convenience for industry, agriculture and daily life, but also generate a large amount of waste. These wastes exist in solid form, and their sources are mostly disposable plastic products such as packaging bags, beverage bottles, and agricultural mulch. These wastes are bulky and take a long time to decompose, making them very difficult to degrade in the natural environment. The treatment methods of plastic waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/06C08K5/56C08K5/55C08B31/06
Inventor 谢晓明崔建明潘瑞坚朱其虎陈有志
Owner 广西农垦明阳生化有限公司
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