Complete biodegradation foam material and preparation method thereof

Abstract

The invention discloses a complete biodegradation foam material and a preparation method thereof; the complete biodegradation foam material mainly comprises polyhydroxy alkanoate, starch and foaming agent; the complete biodegradation foam material is characterized in that: the complete biodegradation foam material does not comprise polylactic acid, and 20-80 parts of the polyhydroxy alkanoate, 20-60 parts of starch and 0.5-5 parts of the foaming agent are included by weight. The foam material takes the starch and the polyhydroxy alkanoate as main raw materials, has good physical properties, can carry out complete biodegradation and greatly reduces the manufacturing cost of the foam material.

Description

technical field [0001] The invention relates to the field of foaming materials, more specifically, to a fully biodegradable foaming material and a preparation method thereof. Background technique [0002] The traditional plastic industry consumes a lot of petroleum energy and the "white pollution" has attracted more and more attention. Since the 1960s and 1970s, people have begun to research and develop biodegradable plastics. At present, there are A variety of biodegradable materials (Biodegradable materials) have come out. After biodegradation, biodegradable materials become water and carbon dioxide, which will not cause harm to the environment. At present, most researches on biodegradable plastics focus on starch, polylactic acid (PLA), polyhydroxyalkanoate (PHAs), etc., but because of the high cost and immature technology, it is difficult to be widely used. The most serious environmental pollution in my country is mainly manifested in disposable packaging materials, fil...

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Problems solved by technology

[0003] The foaming products used in the market are mainly PE foaming materials, PP foaming materials, PU foaming materials, PS foaming materials, EVA foaming materials, PVC foaming materials, PP / starch foaming materials, etc. Foam materials cannot be completely degraded, causing serious environmental pollution

At present, the research on degradable foaming materials is mainly in the blending and foaming of starch, starch and polylactic acid (PLA), polyhydroxybutyrate valerate (PHBV) and other degradable polymers, but due to the brittleness of these materials , is also severely limited in application

There are only a small number of reports on the use of novel PHAs degradable materials to prepare foamed materials: a composition containing polyhydroxybutyrate copolymer and polylactic acid for foamed materials (publication number CN1923890A), which discloses the use of poly( 3-hydroxybutyrate-co-4-hydroxybutyrate) (P3HB4HB), PLA and foaming agent are blended to produce foaming materials, which can also add organic additives such as starch or other inorganic additives, due to the brittleness of PLA. The strength and fracture performance of foamed products are not high, and the filling ratio of starch is therefore limited, which is not ideal in terms of physical properties and manufacturing costs, and it is difficult to achieve large-scale production

And the patent (publication number CN101245175A) a kind of biodegradable foamed plastics and its manufacturing method discloses the foaming material that is main raw material manufacture with PLA resin, polyhydroxyalkanoate copolymer, cornstarch etc., and this foaming material starch Although the filling ratio of PLA resin has increased, the problem of brittleness of PLA resin still exists, and because the heat-resistant temperature of PLA resin is lower than 55°C, it is not suitable for use under high temperature conditions, such as the high temperature generated during transportation. The foaming material is damaged, and it cannot be used in the field of fast food boxes, resulting in very limited application fields. At the same time, the degradation of PLA resin must be carried out under composting conditions, and ordinary people are more casual about discarding foaming materials such as disposable lunch boxes. It does not meet the degradation conditions of PLA resin, so the degradation is slow or even difficult to degrade, and it still cannot solve the serious white pollution problem now

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