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Degradable polylactic acid (PLA) composite material and preparation method thereof

A composite material, polylactic acid technology, applied in the field of degradable polylactic acid composite materials and its preparation, can solve the problems of unsuitable mass production, high mold quality requirements, large equipment investment, etc., and achieve easy control of the production process and excellent mechanical properties , to avoid the effect of polluting the environment

Inactive Publication Date: 2012-10-03
江苏美奥新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the blending of PLA and starch can meet the premise of performance and reduce the cost compared with the high-priced microbial synthesis or artificially synthesized degradable polymers, the absolute price of starch is still relatively high, and some Starch comes from food, causing a food crisis. In our country, this cannot be used as a long-term direction
In addition, the product obtained by directly blending starch and PLA is brittle and sensitive to humidity, the interfacial connection between the two is very poor, and the interfacial bonding force between the hydrophilic starch and the hydrophobic PLA matrix is ​​very poor
[0004] At present, there are reports about PLA composite materials such as the PLA / starch / plasticizer ternary composite material reported by Kim et al. The tensile strength of this composite material can only reach about 60Mpa
In addition, there are still reports in China that use bagasse fiber (BF) and polylactic acid after steam explosion as raw materials to prepare PLA / BF composite materials by molding method. The tensile strength of the PLA / BF composite material is only 49.0Mpa. The range of application fields is small, and the molding method still has the disadvantages of complex mold manufacturing and large investment, and is limited by the press, so it is only suitable for the production of small and medium-sized composite products
In addition, there are disadvantages such as large equipment investment, high mold quality requirements, high cost, not suitable for mass production, and high molding pressure.
[0005] In summary, the main factors restricting the development of polylactic acid are insufficient mechanical properties and high cost. Therefore, improving the mechanical properties of polylactic acid and reducing costs are very important to broaden the application fields of polylactic acid

Method used

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  • Degradable polylactic acid (PLA) composite material and preparation method thereof
  • Degradable polylactic acid (PLA) composite material and preparation method thereof

Examples

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Embodiment 1

[0026] This embodiment provides a method for preparing a degradable polylactic acid composite material, which includes the following steps:

[0027] (1) Superfine crushing of sugarcane leaves: After the sugarcane leaves are dried, they are pre-pulverized on a fine pulverizer (equipment model WFJ-30) to obtain about 300 grams of powder with a particle size of about 1 mm, which is mixed with 1000 milliliters of glycerin After the alcohol is mixed, put it into the HZM-10II type high-frequency vibrating micro-powder mill grinding cylinder for high-frequency grinding, grind for 20 hours and stop for discharging to obtain sugarcane leaf micropowder. Sampling was observed with a graduated microscope and it was found that the average fineness of the sugarcane leaf powder was within 2 μm. After detection by the laser particle size detector, the fineness distribution was as follows: figure 1 shown.

[0028] (2), melt mixing preparation degradable polylactic acid composite material: ado...

Embodiment 2

[0030] This embodiment provides a preparation method of a degradable polylactic acid composite material, which is as follows: 480g PLA and 120g PBAT, 200g sugarcane leaf micropowder, 180g PCL and 20g chain extender prepared according to the method of step (1) of Example 1 , after mixing, add twin-screw extruder and carry out melting mixing, and the parameter of melting mixing is as follows (twin-screw extruder; Φ=26mm; L / D=40; The temperature of feed zone to each district of die head is successively: 160°C, 190°C, 200°C, 200°C, 200°C, 210°C, 210°C, 210°C, 200°C, 200°C; pressure 56; torque 64%; feeding rate 20s), PLA was produced at about 240°C The blend is then extruded and granulated, and dried to obtain polylactic acid composite material slices. The polylactic acid composite slices were injection molded, the mold temperature was 120°C, and the cooling time was 130 seconds. The formed sheets were tested, and the results are shown in Table 1.

Embodiment 3

[0032]This embodiment provides a preparation method of a degradable polylactic acid composite material, which is as follows: 300g PLA and 300g PBAT, 280g sugarcane leaf micropowder, 100g PCL and 20g chain extender prepared according to the method of step (1) of Example 1 , after mixing, add twin-screw extruder and carry out melting mixing, and the parameter of melting mixing is as follows (twin-screw extruder; Φ=26mm; L / D=40; The temperature of feed zone to each district of die head is successively: 160°C, 190°C, 200°C, 200°C, 200°C, 210°C, 210°C, 210°C, 200°C, 200°C; pressure 56; torque 64%; feeding rate 20s), PLA was produced at about 240°C The blend is then extruded and granulated, and dried to obtain polylactic acid composite material slices. The polylactic acid composite slices were injection molded, the mold temperature was 120°C, and the cooling time was 130 seconds. The formed sheets were tested, and the results are shown in Table 1.

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Abstract

The invention relates to a degradable polylactic acid (PLA) composite material and a preparation method thereof. The degradable PLA composite material comprises the following components in percentage by weight: 30 to 50 percent of PLA, 10 to 30 percent of poly(butylenes adipate-co-terephthalate (PBAT), 5 to 20 percent of polycaprolactone (PCL), 1 to 5 percent of chain extender, and 5 to 30 percent of sugarcane top micro powder of which the average fineness is 1 to 10 mu m. The degradable PLA composite material is excellent in mechanical property ( the maximum mechanical property can reach 110MPa) and can be widely applied to the fields of films, spinning, packaging, agriculture and the like. Moreover, compared with that of the conventional PLA starch blended composite material, the cost of the degradable PLA composite material is greatly reduced, and environment pollution which is caused by combusting sugarcane top and the like can be avoided.

Description

technical field [0001] The invention relates to a degradable polylactic acid composite material and a preparation method thereof. Background technique [0002] In recent years, due to the gradual decline in international oil reserves, the full development and utilization of crop renewable resources will become one of the important issues in agricultural development. my country is a large agricultural country, and the development of new ways, new technologies, and new equipment for the utilization of agricultural waste will benefit farmers. It is of great significance to increase income, reduce environmental pollution caused by incineration, and develop ecological agriculture. In addition, the development of degradable materials is also the main way to solve the current "white pollution" problem. [0003] It is known that sugarcane leaves are a kind of agricultural waste, which has abundant sources and is a non-exhaustive resource. At present, it has no high application value...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/02C08L97/02B29B9/06
Inventor 卞忠华
Owner 江苏美奥新材料有限公司
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