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Biodegradable foam plastic and preparation method thereof

A technology of foam plastics and biodegradation, which is applied in the field of foam plastics and its preparation, can solve the problems of strict labor protection requirements, low thermal deformation temperature, and high price, and achieves less stringent safety protection requirements, simple process equipment, and high quantum yield. high effect

Inactive Publication Date: 2010-06-02
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patents CN1544525 and CN1544514 respectively disclose a biodegradable polylactic acid plastic preparation method and a biodegradable polylactic acid foam containing a chain extender and a preparation method thereof, but the products obtained by these two technologies foam uneven
Chinese patent CN1919926 discloses a polylactic acid-starch foaming material and its preparation method, but the relative molecular weight distribution of the polylactic acid obtained by polymerization in this method is too wide, the strength often cannot meet the requirements, high brittleness, low heat distortion temperature, and low impact resistance. Difference
Polylactic acid has poor thermal stability and is prone to severe thermal degradation during processing, resulting in a significant drop in molecular weight
At the same time, its price is relatively expensive. The price of lactic acid and the polymerization process determine the high cost of polylactic acid.
These all limit the large-scale application of polylactic acid and its products
[0005] Chinese patent CN1544526A, CN1618875A and CN1687231A disclose polyε-caprolactone respectively, peroxide crosslinked polyε-caprolactone and polyε-caprolactone / inorganic filler composite material foam and preparation method thereof, although obtained Corresponding foam plastics, but the decline in mechanical properties and the expensive price of polyε-caprolactone limit their use
However, this method has relatively high requirements for equipment, strict requirements for labor protection, and is easy to cause pollution to the environment, making it difficult to realize industrialization.

Method used

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  • Biodegradable foam plastic and preparation method thereof
  • Biodegradable foam plastic and preparation method thereof
  • Biodegradable foam plastic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 100 parts by mass of polybutylene succinate with a molecular weight of 30,000, 1 part by mass of UV photoinitiator benzoin, 3 parts by mass of crosslinking agent trimethylolpropane trimethacrylate, 3 parts by mass of Inorganic blowing agent modified carbonate (white blowing agent TH-308), the nucleating agent nano-scale calcium carbonate of 2 mass parts, the additive of 10 mass parts (promoter zinc oxide of 5 mass parts and 5 mass parts Lubricant stearic acid) was mixed in a twin-screw extruder at 130°C for 5 minutes. After mixing evenly, it was pressed on a hot press at 150°C and 5-10 MPa for 2 minutes. After natural cooling, flakes of about 0.1 mm were obtained. Then the sheet was irradiated with a 200w medium-pressure mercury lamp for 10 minutes to obtain cross-linked polybutylene succinate with a gel content of 40.1%.

[0045] The determination of the gel content adopts the extraction method, and the specific method is as follows: put the sample after ultraviolet ir...

Embodiment 2

[0048] 100 mass parts molecular weight is 40,000 polybutylene succinate, 2 mass parts of photoinitiator α-hydroxyalkyl phenone, 7 mass parts of crosslinking agent triallyl cyanurate, 5 mass parts The foaming agent azodicarbonamide, the nucleating agent nano-scale silicon dioxide of 3 mass parts, the additive (accelerator zinc oxide) of 5 mass parts mix 10min at 140 ℃ in twin-screw extruder, after mixing uniformly , press on a hot press at 140°C, 5-10Mpa for 10min, and get a thin slice of about 0.3mm after natural cooling. Then the slice was irradiated with a 1000w medium-pressure mercury lamp for 2 minutes to obtain cross-linked polybutylene succinate with a gel content of 35.6%. The assay method of gel content is with embodiment 1.

[0049] Then foam it at 180° C. for 20 minutes on a hot press to obtain a polybutylene succinate foam. The scanning electron micrograph of gained foamed plastics (see figure 1 ) shows that a uniform and fine foam structure has been obtained. T...

Embodiment 3

[0052] 100 mass parts molecular weight is 50,000 polybutylene succinate, 3 mass parts of photoinitiator dialkoxy acetophenone, 10 mass parts of crosslinking agent pentaerythyl alcohol tetramethacrylate, 7.5 mass parts of Foaming agent 4,4-disulfonylhydrazide diphenyl ether, the nucleating agent nanoscale talcum powder of 1 mass part, the additive of 5 mass parts (the lubricant stearic acid of 3 mass parts and the plasticizer of 2 mass parts Glycerin) was mixed in a twin-screw extruder at 160°C for 20min. After mixing evenly, it was pressed on a hot press at 160°C and 5-10Mpa for 5min, and a sheet of about 0.5mm was obtained after natural cooling. Then the slice was irradiated with a 400w medium-pressure mercury lamp for 5 minutes to obtain cross-linked polybutylene succinate with a gel content of 28.7%. Then foam at 210° C. for 30 minutes to obtain polybutylene succinate foam. Foam density is 159Kg / m 3 .

[0053] The enzymatic degradation test was used to characterize the d...

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Abstract

The invention discloses a biodegradable foam plastic and a preparation method thereof. The raw materials for preparing the foam plastic comprise 100 parts by weight of a or b and 0.01-10 parts by weight of UV photoinitiator, cross-linking agent and foaming agent, wherein a is poly(butylene succinate), and b is a copolymer formed by the poly(butylene succinate) and polyether; the number-average molecular weight of the poly(butylene succinate) is 10,000-100,000; and the number-average molecular weight of the copolymer formed by the poly(butylene succinate) and the polyether is 10,000-100,000. The method for preparing the biodegradable foam plastic comprises the steps of melting and mixing the raw materials of the foam plastic, then pressing into a sheet, carrying out UV irradiation on the obtained sheet, carrying out foaming and obtaining the biodegradable foam plastic.

Description

technical field [0001] The invention relates to a biodegradable foamed plastic and a preparation method thereof. Background technique [0002] As a lightweight material, foam plastic has a series of advantages such as heat insulation, sound insulation, cushioning, high specific strength, and low price, so it is widely used in packaging, industry, agriculture, transportation, daily necessities and other fields. At present, the main varieties are polyurethane foam, polystyrene foam, polyolefin foam, etc. While these foam products are convenient for human production and life, they also bring great troubles to humans, because these foam products are large There are some harmful substances in the production process, especially wastes that are difficult to recycle, difficult to decompose in the natural environment, or harmful gases or substances are produced during the waste process, causing cross-infection, thus causing damage to the natural environment on which human beings depe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/02C08F283/06C08J9/06C08L51/08B29C69/02B29C43/58B29C44/60B29B7/28B29B7/72
Inventor 黄希李春成张栋管国虎肖耀南
Owner INST OF CHEM CHINESE ACAD OF SCI
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