A flame-retardant degradable starch-based composite material for injection molding and its preparation method

Abstract

The invention relates to a flame-retardant degradable starch-based composition material for injection molding. The composite material is prepared from, by weight, 60-70 parts of thermoplastic starch, 40-60 parts of polyhydroxybutyrate, 25-40 parts of glycerin, 20-40 parts of talcum powder, 5-15 parts of a cross-linking agent, 5-10 parts of a compatilizer, 10-20 parts of nano-magnesium hydroxide and 1-2 parts of other additives. The prepared composition material is good in flame resistance, excellent in water resistance and mechanical property, capable of achieving complete biological degradation, short in degradation period, capable of being produced through traditional plastic processing equipment and easy to process and popularize.

Description

technical field [0001] The invention relates to a degradable plastic and a preparation method thereof, in particular to a flame-retardant degradable starch-based composite material for injection molding and a preparation method thereof. Background technique [0002] Plastics are widely used in various fields of national life, especially in food packaging, the application of plastic products is very common. With the accelerated pace of life, disposable plastic products such as disposable lunch boxes are widely favored by the public. However, it takes hundreds of years for traditional plastic products to degrade under natural conditions, and they remain in the natural environment for a long time, destroying the metabolism of the natural environment and causing serious damage to the natural environment. Moreover, the raw materials for preparing traditional plastic products mainly come from petroleum. With the depletion of petroleum resources, it is urgent to study a plastic th...

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Problems solved by technology

[0010] However, the above-mentioned published patents have their own obvious shortcomings, which affect the use of starch-based degradable plastics, mainly reflected in:

[0011] (1) Refractory raw materials such as polyethylene or polypropylene are added to the formula, which cannot be completely degraded in the soil and do not meet the requirements of environmental protection, such as Chinese patent applications CN 104910439 A, CN 102408586 A

[0012] (2) The compatibility of thermoplastic starch and the added resin is not good, so the mechanical properties are not good, such as Chinese patent application CN 104387621 A

[0013] (3) Starch has relatively good water absorption, and the products disclosed in the above-mentioned patents do not solve the problem of poor water resistance, which limits the scope of application of the product

[0014] (4) None of the products disclosed in the above patents involve the flame retardancy of composite materials

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