Method and material for preparing polylactic acid-natural rubber porous material by micropore injection molding foaming
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 贵州黔城黔测检测技术有限公司
- Publication Date
- 2018-01-19
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Abstract
Description
technical field
[0001] The invention belongs to the technical field of microporous injection foaming, in particular to a method and material for preparing polylactic acid-natural rubber porous material by microporous injection foaming. Background technique
[0002] The development of microcellular injection foaming technology began in 1970 and 1980. The foaming process of microcellular injection molding is divided into three steps: nucleation, cell enlargement and cell stabilization. First, a supercritical fluid (usually nitrogen or carbon dioxide) is dissolved in the polymer melt as a blowing agent to form a polymer-gas homogeneous solution, that is, the polymer melt is supersaturated with gas. Then, the gas pressure suddenly drops below the saturation pressure, resulting in thermodynamic instability leading to the nucleation of cells. Cell growth is controlled by the diffusion rate of the gas and the strength of the polymer-gas melt. The cell density of microcellular in...