Preparation method of biodegradable polymer foamed particles

A technology for degrading polymers and expanded particles is applied in the field of preparation of biodegradable polylactic acid or polylactic acid composite expanded particles, and can solve the problems of slow gaseous diffusion rate, poor foaming effect, and long production cycle. , to achieve the effect of short saturation time, conducive to industrialized implementation and easy operation
CN102127245BActive Publication Date: 2012-05-30NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Publication Date
2012-05-30

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Abstract

The invention discloses a preparation method of biodegradable polymer foamed particles, which comprises the following steps: (1) mixing polymer particles and a 0.5-8 MPa high-pressure fluid until the polymer particles are saturated, thereby obtaining the saturated polymer particles; and (2) putting the saturated polymer particles obtained in the step (1) in hot air with 60-150 DEG C, and foaming for 1-300 seconds, thereby obtaining the polymer foamed particles, wherein the polymer is polylactic acid, or a compound of polylactic acid and other polymers. The method is simple to operate, and canbe easily used for industrial production; and the prepared foamed particles have the characteristics of high expansion ratio, smooth surface, high degree of crystallization, uniform foam pore structure, high foam pore density and the like.
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Description

technical field

[0001] The invention relates to the field of preparation methods of polymer foamed particles, in particular to a preparation method of biodegradable polylactic acid or polylactic acid composite foamed particles. Background technique

[0002] Polymer foam materials are widely used in plastic packaging, construction, daily necessities, automobiles, biomedical, aerospace and other fields due to their excellent performance and light weight. Among them, polystyrene foam material is the most widely used polymer foam material, widely used in disposable lunch box products, cushioning packaging, heat insulation and sound insulation materials, etc. However, polystyrene resin is difficult to degrade in the natural environment, and it is usually landfilled, which has brought serious problems to the environment. In recent years, countries around the world have successively promulgated laws to prohibit or restrict the use of polystyrene foam materials. It is urgent to de...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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