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High-starch-content film blowing composite material and preparation method thereof

A composite material and high starch technology, which is applied in the field of high starch content blown film composite materials and its preparation, can solve the problems of reduced molecular flexibility, poor biodegradability, low starch content, etc., and achieves improved biodegradability and component compatibility. Good properties and high starch content

Pending Publication Date: 2020-01-07
浙江华发生态科技有限公司
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Problems solved by technology

Its disadvantages are: firstly, the degree of crosslinking is not easy to control when the starch is modified with a crosslinking agent; secondly, the crosslinking reaction occurs between the starch and the crosslinking agent, and the strength of the obtained starch is better, but it is difficult for the crystallization of the starch The treatment effect of polarity and reactivity is not good; third, the cross-linking reaction reduces the rotation degree of starch molecules due to the steric effect, reduces the flexibility of the molecules, and increases the rigidity, so the product is more brittle
The disadvantage is that the modified starch has poor processability and poor compatibility with resins, resulting in poor mechanical strength and rough appearance of the film products, and the starch content in the masterbatch and film products is low, so the biodegradability is poor

Method used

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  • High-starch-content film blowing composite material and preparation method thereof

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preparation example Construction

[0031] In a preferred embodiment, the preparation method of the hydroxypropyl acetylated high amylose cornstarch comprises the following steps:

[0032] (1) Dissolving high amylose cornstarch in sodium sulfate solution to make starch milk with a mass concentration of 35%, the quality of sodium sulfate accounts for 10% of the starch mass. Constant temperature water bath, stirring at a constant speed, slowly drop 1wt% sodium hydroxide solution to adjust the pH of the emulsion to 8.5, then add propylene oxide, the mass of propylene oxide accounts for 10% of the starch mass. Nitrogen, sealed container, reaction 24h. After the reaction, the pH was adjusted to 6.50 with 1 wt% hydrochloric acid solution. Washing the starch with water, washing with alcohol, drying, and sieving to obtain hydroxypropyl etherified starch;

[0033] (2) Dissolve the hydroxypropyl etherified starch obtained in step (1) in distilled water to obtain a hydroxypropyl etherified starch emulsion with a volume f...

Embodiment 1

[0077] Embodiment 1 provides a kind of high starch content blown film composite material, comprises the raw material of following parts by weight: starch 43 parts, low-density polyethylene 30 parts, epoxy vegetable oil plasticizer 15 parts, internal lubricant 1.3 parts, external lubricant 0.6 parts of agent, 0.8 parts of coupling agent, 7 parts of compatibilizer, and 0.35 parts of antioxidant.

[0078] The starch is corn starch.

[0079] The corn starch is high amylose corn starch.

[0080] The mass percentage of amylose in the high amylose corn starch is 60%.

[0081] The high amylose corn starch is hydroxypropyl acetylated high amylose corn starch.

[0082] The preparation method of described hydroxypropyl acetylated high amylose cornstarch comprises the following steps:

[0083] (1) Dissolving high amylose cornstarch in sodium sulfate solution to make starch milk with a mass concentration of 35%, the quality of sodium sulfate accounts for 10% of the starch mass. Constan...

Embodiment 2

[0103] Embodiment 2 is substantially the same as Embodiment 1, the only difference being that it comprises the following raw materials in parts by weight: 35 parts of starch, 20 parts of low-density polyethylene, 10 parts of epoxy vegetable oil plasticizer, 0.5 part of internal lubricant, and 0.5 part of external lubricant 0.1 part, 0.5 part of coupling agent, 3 parts of compatibilizer, 0.2 part of antioxidant.

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Abstract

The invention relates to the technical field of biodegradable composite materials, and in particular relates to a high-starch-content film blowing composite material and a preparation method thereof.The high-starch-content film blowing composite material comprises the following raw materials in parts by weight: 35-50 parts of starch, 20-40 parts of low-density polyethylene, 10-20 parts of an epoxy vegetable oil plasticizer, 0.5-2 parts of an internal lubricant, 0.1-1 part of an external lubricant, 0.5-1 part of a coupling agent, 3-10 parts of a compatilizer and 0.2-0.5 part of an antioxidant.The high-starch composite material disclosed by the invention is high in starch content, low in cost and good in component compatibility, the mechanical property and the biodegradability of the material are remarkably improved, and the high-starch composite material has excellent characteristics of sustainable development and can be processed into a product by adopting processes such as mould pressing, extrusion and injection molding on universal plastic processing equipment.

Description

technical field [0001] The invention belongs to the technical field of biodegradable composite materials, in particular, the invention relates to a blown film composite material with high starch content and a preparation method thereof. Background technique [0002] With the development of the plastics industry and the development of plastic varieties, more and more plastic products have become indispensable materials in people's life. Traditional plastics are difficult to biodegrade, and a large amount of plastic waste has seriously polluted the environment. [0003] The degradable plastics currently in use are mainly starch plastics. The starch content in this type of starch plastics is relatively low, generally 10-30%, and the remaining main components are still difficult-to-degrade polymer components. Chinese patent CN1478809A discloses a biodegradable starch resin masterbatch and its preparation method. Firstly, the micronized starch is prepared by a high-speed impact ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/18C08L23/06C08L91/00C08J5/18
CPCC08J5/18C08J2303/18C08J2423/06C08J2491/00
Inventor 吕沙峰张剑锋
Owner 浙江华发生态科技有限公司
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