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Starch-based sheet material composition and preparation method thereof
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A composition and starch-based technology, applied in the field of materials, can solve problems such as the description and interpretation of the mechanical properties of products, and achieve the effects of improving plasticity, high elongation at break, and excellent performance
Pending Publication Date: 2022-01-07
蚌埠天成包装科技股份有限公司
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This invention prepares a composite modified product of adding calciumcarbonate to starch, but does not explain and explain the mechanical properties of the product
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preparation example Construction
[0039] Preferably, the preparation method of described organic acid oligomer comprises the following steps:
[0040] Mix organic dibasic acid or polybasic acid, dibasic alcohol and pentaerythritol, carry out heating reaction under the condition of stirring, remove the water produced by the reaction in vacuum, and obtain carboxyl-terminated organic acid oligomer.
[0041] In the present invention, organic dibasic acid or polybasic acid, dibasic alcohol and pentaerythritol are mixed in a reaction kettle to obtain a mixture.
[0042]Wherein, the molar ratio of the organic dibasic acid or polybasic acid, dibasic alcohol and pentaerythritol is (1.2~1.5):1:0.01, preferably 1.2:1:0.01, 1.3:1:0.01, 1.4:1:0.01 , 1.5:1:0.01, or any value between (1.2~1.5):1:0.01.
[0073] In a reaction kettle equipped with a stirring device and a thermometer, add citric acid, 1,4-butanediol, and pentaerythritol in a molar ratio of 1.5:1:0.01, raise the temperature to 150°C, react for 30 minutes, and distill off under reduced pressure. Water is the by-product of the reaction, and the product is discharged from the reactor to obtain organic acid oligomer A with a degree of polymerization of 100-200, which is used for later use.
preparation example 2
[0075] In a reaction kettle equipped with a stirring device and a thermometer, add malic acid, neopentyl glycol, and pentaerythritol in a molar ratio of 1.2:1:0.01, raise the temperature to 90°C, and react for 60 minutes, then distill off the reaction by-products under reduced pressure water, and the product is discharged from the reactor to obtain organic acid oligomer B with a degree of polymerization of 100-150, which is set aside.
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Abstract
The invention provides a starch-based sheet material composition, which is prepared from the following raw materials in parts by weight: 100 parts of starch, 0.5-2 parts of nano silicon dioxide, 50-200 parts of a degradable resin, 2-10 parts of a coupling agent and 2-10 parts of an organic acidoligomer, wherein the organic acidoligomer is prepared from organic dibasic acid or polybasic acid, diol and pentaerythritol. According to the invention, a binary or polybasic organic acidcopolymer with a specific chain length is designed based on an esterification reaction of hydroxyl groups on the surface of starch, an organic acid is grafted on the surface of the starch so as to destroy the crystal structure of the starch and improve the plasticity of the starch, and the starch can be blended and compounded with a degradable resin under a condition that a plasticizer is not additionally added, so that the low-cost fully-degradable modified resin with excellent performance is prepared; and the starch in the composition can be uniformly distributed in the matrix resin, and the obtained product is high in mechanical strength and high in elongation at break after being extruded into a sheet.
Description
technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a starch-based sheet material composition and a preparation method. Background technique [0002] Environmentally friendly degradation of polymer materials has become the main development trend of future civil polymers, especially disposable polymers. Polymer materials based on aliphatic polyesters have good degradation performance, but the cost is high, which is not conducive to large-scale promotion and use. Although the addition of inorganic mineral fillers such as talc and calciumcarbonate can reduce the cost, the inorganic fillers will not be decomposed into environmentally harmless small molecules after the degradable polymer is degraded, and the impact on the surrounding environment is difficult to evaluate in a short time. However, fully degradable resins based on natural polymer materials such as starch do not have the above-mentioned problems. As long as...
Claims
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