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Water-resistant biological starch plastic and preparation method thereof

A bio-starch and water-resistant technology, applied in the field of water-resistant bio-starch plastics and its preparation, can solve the problems of easy water absorption and precipitation, volatile plasticizers, etc., and achieve the effects of uniform performance, uniform heat resistance, and good water resistance

Inactive Publication Date: 2020-10-30
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for preparing water-resistant bio-starch plastics, which is used to solve the problem that small-molecule plasticizers in the prior art are easy to volatilize and plasticizers are processed at high temperatures. Residues in plastic products are easy to absorb water and precipitate, and at the same time, the present invention will also provide a water-resistant bio-starch plastic

Method used

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  • Water-resistant biological starch plastic and preparation method thereof
  • Water-resistant biological starch plastic and preparation method thereof
  • Water-resistant biological starch plastic and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] A preparation method for water-resistant bio-starch plastics, comprising the steps of:

[0042] Step 1. Add starch (corn starch) to the sealed high-speed mixer. Set the temperature of the high-speed mixer to 100°C, and set the vacuum exhaust port (the vacuum gauge value of the vacuum exhaust port is controlled at -0.06MPa Mpa), and stir at a low speed. (The stirring rate is 50r / min, and the stirring time is 60min) to completely remove the crystallization water of starch to obtain anhydrous starch;

[0043] Step 2. Use a ball mill to grind the anhydrous starch in step 1 to the nanometer level to obtain nano-anhydrous starch (the particle size of nano-anhydrous starch is ≤ 100nm);

[0044] Step 3: Melt and mix stearic acid, paraffin, and polyethylene wax at 80°C to obtain an oily mixture, then add the nano-anhydrous starch in Step 2 into the oily mixture, and use a plunger pump high-pressure homogenizer (homogenization temperature The temperature is 90°C, the homogenizat...

Embodiment 2

[0048] A preparation method for water-resistant bio-starch plastics, comprising the steps of:

[0049] Step 1. Add starch (tapioca starch) into the sealed high-speed mixer, set the temperature of the high-speed mixer to 110°C, and set the vacuum exhaust port (the vacuum gauge value of the vacuum exhaust port is controlled at -0.08Mpa), and stir at a low speed ( The stirring rate is 100r / min, and the stirring time is 45min) to completely remove the crystallization water of starch to obtain anhydrous starch;

[0050] Step 2. Use a ball mill to grind the anhydrous starch in step 1 to the nanometer level to obtain nano-anhydrous starch (the particle size of nano-anhydrous starch is ≤ 100nm);

[0051] Step 3: Melt and mix stearic acid, paraffin, and polyethylene wax at 90°C to obtain an oily mixture, then add the nano-anhydrous starch in Step 2 into the oily mixture, and use a plunger pump high-pressure homogenizer (homogenization temperature The temperature is 95°C, the homogeniz...

Embodiment 3

[0055] A preparation method for water-resistant bio-starch plastics, comprising the steps of:

[0056] Step 1. Add starch (pea starch) into the sealed high-speed mixer, set the temperature of the high-speed mixer to 105°C, and set the vacuum exhaust port (the vacuum gauge value of the vacuum exhaust port is controlled at -0.07Mpa), and stir at a low speed ( The stirring rate is 120r / min, and the stirring time is 50min) to completely remove the crystallization water of starch to obtain anhydrous starch;

[0057] Step 2. Use a ball mill to grind the anhydrous starch in step 1 to the nanometer level to obtain nano-anhydrous starch (the particle size of nano-anhydrous starch is ≤ 100nm);

[0058] Step 3: Melt and mix stearic acid, paraffin, and polyethylene wax at 85°C to obtain an oily mixture, then add the nano-anhydrous starch in Step 2 into the oily mixture, and use a plunger pump high-pressure homogenizer (homogeneous temperature The temperature is 90°C, the homogenization v...

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Abstract

The invention relates to the technical field of degradable plastics, in particular to a preparation method of a water-resistant biological starch plastic. The preparation method comprises the following steps: adding starch into a mixing machine, and removing crystal water of the starch in vacuum; grinding and refining the anhydrous starch to nanoscale to obtain nano anhydrous starch; melting and mixing stearic acid, paraffin and polyethylene wax to obtain an oily mixture, adding the nano anhydrous starch into the oily mixture, and performing high-pressure homogenization to obtain homogeneous slurry; standing, condensing and crushing the homogenized slurry to obtain water-resistant thermoplastic starch; anda mixing the water-resistant thermoplastic starch, polyethylene and a compatilizer, and feeding the mixture into an extruder to be extruded, thereby obtaining the product. The problems that in the prior art, small-molecule plasticizers are prone to volatilizing during high-temperatureprocessing, and residual plasticizers in plastic products are prone to absorbing water and being separated out are solved. According to the preparation method, the starch is modified in advance, so that the prepared water-resistant biological starch plastic has the advantages of good water resistance, heat resistance and uniform performance.

Description

technical field [0001] The invention relates to the technical field of degradable plastics, in particular to a water-resistant bio-starch plastic and a preparation method thereof. Background technique [0002] Biodegradable plastic is a new energy-saving and environmentally friendly material. Because it contains active groups such as hydroxyl, ester, and carboxyl that are easily decomposed by microorganisms, when placed in a natural environment under certain temperature and humidity conditions, due to the action of microorganisms, it is easily decomposed into water and carbon dioxide, thus returning to the atmosphere. nature. Its development originally began in the 1970s. After more than 40 years of development, it has reserved a solid technical foundation, its technology has been continuously updated, and product performance has been continuously improved. With the continuous rise of market demand, the industrial transformation and application of various technological ac...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L23/06C08L91/06C08L51/06C08K5/09
CPCC08L3/02C08L2201/06C08L2201/08C08L2205/025C08L2205/035C08L23/06C08L91/06C08L51/06C08K5/09
Inventor 陈庆曾军堂白涛司文彬
Owner CHENDU NEW KELI CHEM SCI CO LTD