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A biodegradable high-barrier plastic product and its preparation method

A plastic product and biodegradation technology, applied in the field of plastic packaging, can solve the problems of material performance degradation, less application, and easy precipitation of plasticizers, etc., to reduce thermal decomposition, speed up molding speed, increase mechanical strength and barrier properties Effect

Active Publication Date: 2018-11-27
江苏南方包装有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding a plasticizer can reduce the melting temperature of the material, but the plasticizer is easy to precipitate, resulting in a significant drop in material performance
[0004] At present, biodegradable polymer materials are mainly used in flexible packaging such as films in the packaging industry, and are rarely used in rigid packaging such as plastic bottles.

Method used

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  • A biodegradable high-barrier plastic product and its preparation method
  • A biodegradable high-barrier plastic product and its preparation method
  • A biodegradable high-barrier plastic product and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to the formula shown in Table 2, the grape pomace extract was dissolved in methanol, and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) and copolymer of hydroxycaprylate and hydroxybutyrate were added (the molar content of hydroxycaprylate is 3%), stir to obtain a suspension; raise the temperature and keep it at 50~60°C, stir until the solvent is completely volatilized, and obtain a modified polyhydroxyalkanoate; prepare the modified polyhydroxyalkanoate Ester, polylactic acid PLA and hydrophobic nano-silica are mixed evenly in a high-speed mixer, then melted and plasticized in a twin-screw extruder, and pelletized to obtain plastic pellets. The plasticizing temperature is 140°C; finally, the plastic pellets are heated And the injection molded embryo is stretched and blow molded into a plastic bottle in a blow mold at a molding temperature of 55°C.

Embodiment 2

[0039] According to the formula shown in Table 2, the grape pomace extract was dissolved in methanol, and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) and copolymerization of hydroxydodecanoate and hydroxybutyrate were added (the molar content of hydroxydodecanoic acid ester is 2%), stir to obtain a suspension; raise the temperature and keep it at 50~60°C, stir until the solvent is completely volatilized, and obtain a modified polyhydroxyalkanoate; prepare the modified polyhydroxyalkanoate Hydroxy fatty acid ester, polylactic acid PLA and hydrophobic nano-silica are mixed evenly in a high-speed mixer, then melted and plasticized in a twin-screw extruder, and pelletized to obtain plastic pellets. The plasticizing temperature is 165°C; finally, the plastic The pellets are heated and injection-molded into embryos, stretched and blow-molded into plastic bottles in a blow-molding mold, and the molding temperature is 70°C.

Embodiment 3

[0041] According to the formula shown in Table 2, the grape pomace extract was dissolved in methanol, and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3 -hydroxycaproic acid ester) (3-hydroxycaproic acid ester molar content is 10%), stirring to obtain a suspension; heating and maintaining at 50-60 ° C, stirring until the solvent is completely volatilized, to obtain a modified polyhydroxyalkanoate; Mix the prepared modified polyhydroxyalkanoate, polylactic acid PLA and hydrophobic nano-silica in a high-speed mixer, then melt and plasticize in a twin-screw extruder, and granulate to obtain plastic pellets. The plasticizing temperature is 170°C; Finally, the plastic pellets are heated and injection-molded into embryos, stretched and blown into plastic bottles in a blow mold, and the molding temperature is 65°C.

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Abstract

The invention discloses a biodegradable high-barrier type plastic product and a preparation method of the biodegradable high-barrier type plastic product. The plastic product is prepared from the following raw materials in percentage by weight: 55 percent to 80 percent of polylactic acid, 15 percent to 30 percent of poly(3-hydroxybutyrate-co-4-hydroxybutyrate), 2 percent to 5 percent of polyhydroxyalkanoate containing middle and long chains, 1 percent to 6 percent of grape fruit residue extract and 2 percent to 6 percent of hydrophobic nano silicon dioxide. According to the biodegradable high-barrier type plastic product, the poly(3-hydroxybutyrate-co-4-hydroxybutyrate) is used for toughening the polylactic acid; meanwhile, the low-molecular-weight polylactic acid is added to increase the compatibility of high-molecular-weight polylactic acid and the poly(3-hydroxybutyrate-co-4-hydroxybutyrate); the grape fruit residue extract is used for improving the thermal stability and machinability of the polyhydroxyalkanoate. The biodegradable high-barrier type plastic product provided by the invention has good mechanical strength, anti-falling property and water resistance and air resistance; a machining process is easy to control and the defective rate is low; the biodegradable high-barrier type plastic product can be applied to fields including food packages, cosmetic packages, medicine packages and the like.

Description

technical field [0001] The invention relates to the field of plastic packaging, in particular to a biodegradable high-barrier plastic product and a preparation method thereof. Background technique [0002] With the increasing shortage of petrochemical resources and the increasing white pollution, biodegradable polymer materials based on biomass and natural resources have become a research focus and development trend. As a biodegradable plastic, polylactic acid (PLA) has the basic characteristics of general-purpose plastics. It can not only be thermoformed, but also has good thermal stability and processing performance. It can be used for packaging materials, home appliance casings, etc. However, PLA itself is a linear polymer with a crystallinity of over 60%, so the material is hard and brittle, with poor toughness and low impact strength. In addition, due to the poor barrier properties of PLA to water vapor and oxygen, its application in the packaging field is also limited...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K9/06C08K3/36C08K5/04
CPCC08K2201/011C08L67/04C08L2201/06C08L2201/08C08L2201/14C08L2205/025C08L2205/03C08L2205/24C08K9/06C08K3/36C08K5/04
Inventor 伍雪芬王小妹蔡军杰丘日才
Owner 江苏南方包装有限公司
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