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Preparation method and application of starch special for plastics

A technology of starch and plastics, which is applied in the field of preparation of special starch for plastics. It can solve the problems of incomplete water treatment, slow precipitation of plasticizers, narrowing of application occasions, etc., and achieve low cost, improved material performance, and good product performance.

Pending Publication Date: 2021-11-05
SHANDONG YUSHI BIOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At higher temperatures, although plasticizers can plasticize starch into thermoplastic starch, the unfavorable consequence is that when thermoplastic starch is used to make products, the plasticizer will slowly precipitate from the product, resulting in poor quality and poor application. The narrowing of the occasion is a technical difficulty that the existing technology cannot overcome at present
In addition, due to the incomplete water treatment in thermoplastic starch, thermoplastic starch products inevitably have the technical defect of retrogradation and brittleness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Starch 5000g (commercial starch, moisture content 13.4%wt), water 420g, mix 10 minutes in high-speed mixer. The mixture is continuously added to the puffing machine, wherein the puffing machine is a twin-screw extruder with a screw diameter of 35mm, a rotation speed of 150r / min, 3 heating zones, and the temperature is set at 90°C, 120°C, 120°C, and the diameter of the die is 3mm. The starch is extruded, heated and expanded by an extruder to obtain starch puffed body; after the process of the extruder, a hot air blower is installed, and the hot air blower is purchased from the market. The puffed body was immediately dried by a hot air blower, and after 10 minutes, the water content of the starch was measured to be 1.54%; the dried puffed body was broken into small pieces, and then crushed in a jet mill, and after 20 minutes, it was obtained Starch, the mesh number of starch is 150--200 mesh.

Embodiment 2

[0104] 5000g of starch from a corn starch factory was purchased, and the moisture content was 13.2%wt after testing. An additional water inlet is provided at the feed inlet of the extruder. Water flows through this nozzle to the feed port. The starch and water are simultaneously and continuously added to the extruder, wherein the starch and water are added in a ratio of 7:1 (mass ratio). The extruder is a twin-screw extruder with a screw diameter of 35mm and a rotational speed of 150r / min. There are 3 heating zones, the temperature is set at 90°C, 120°C, and 120°C, and the diameter of the die is 3mm. The starch is extruded, heated and expanded by an extruder to obtain an expanded starch; the expanded starch is pre-dried by a blower, and the water content of the expanded starch is measured to be 7.3%. Finally, the pre-dried starch puffed body is broken into small flakes with a crusher, and dried in an electric oven, and the temperature of the oven is set at 120°C. After 20 m...

Embodiment 3

[0106] Semi-moist starch with a moisture content of 20% is custom-made from a certain starch factory. Add 5kg of semi-wet starch continuously to the extruder, which is a twin-screw extruder with a screw diameter of 35mm and a rotational speed of 150r / min. There are 3 heating zones, the temperature is set at 90°C, 130°C, and 120°C, and the diameter of the die is 1mm. The semi-wet starch is extruded, heated and expanded by an extruder to obtain starch puffed body; after the process of the extruder, a hot air blower is installed. The hot air blower is purchased from the market. The starch puffed body was dried immediately by a hot air blower, and after 15 minutes, the water content of the starch was measured to be 0.93%; the dried puffed body was broken into small flakes, and then pulverized in a jet mill, and after 15 minutes, it was obtained Special starch for plastics, the mesh number of starch is 180 mesh.

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Abstract

In order to solve the technical problems of plasticizer precipitation and starch retrogradation and embrittlement of a starch-based plastic product, the invention discloses a preparation method and application of special starch for plastics. The preparation method of the starch special for the plastic comprises the following steps of: puffing starch containing a certain amount of moisture; drying the starch; and crushing the starch to specified fineness so as to obtain the starch special for the plastics. The starch special for plastics can be directly melted and mixed with plastic master batches without being plasticized to prepare a starch-based plastic product. With the starch special for plastics adopted, when the starch-based plastic product is prepared, no starch plasticizer is added, but the obtained product has better performance and lower cost.

Description

technical field [0001] The invention relates to the field of plastic raw materials, in particular to a preparation method and application of plastic-specific starch. Background technique [0002] With the improvement of environmental protection requirements and the implementation of environmental protection policies, in the field of plastics, especially in the field of biodegradable plastics, it is required to use as many renewable and natural polymer materials as possible in plastic products, thereby reducing costs and saving Use of petroleum-based biodegradable plastic materials. Many existing technologies have disclosed adding natural polymer starch to biodegradable materials such as PLA and PBAT. However, since starch is a relatively rigid material, its melting point is even higher than its carbonization point, so it is difficult for starch to combine with PLA, PBAT, etc. Material mixing and melting processing. For this reason, the technical route taken by the prior ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B30/12C08L23/06C08L67/02C08L3/02C08J5/18C08J3/22
CPCC08B30/12C08J5/18C08J3/22C08J2323/06C08J2403/02C08J2467/02
Inventor 刘一帆
Owner SHANDONG YUSHI BIOTECHNOLOGY CO LTD
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