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PVF natural polymer in the new application of foam

Preparation of strong foam. Li and beads and other studies also show that the addition of fiber, the starch melt to form cross-linked three-dimensional network structure, the starch melt slightly improved, is conducive to uniform expansion of the bubble, forming a uniform foam density, but also reduces the extrusion bubbles during the escape, sheet shrinkage reduction, adding excessive, high melt strength, flexibility and rigidity, China Packaging 2005 / 6 expansion of the bubble is difficult to quickly and evenly, so the foam $ L / J, and less foaming times significantly reduced. Fibers joining system, in order to provide the gas expansion foam skeleton structure, to prevent rupture and collapse when the bubble expanded. Compared with the inorganic filler starch on cellulose has better wettability, and therefore adding starch cellulose biodegradable materials are expected to improve the mechanical properties. Add the starch foam molding cellulose,[link widoczny dla zalogowanych], the various physical properties as follows (2) physical properties (material level) is defined: its waste in a relatively short period of time, mechanical properties decrease, or complete loss of most applications. (3) The form of the definition: the breakdown of waste in a short time, collapse broken,[link widoczny dla zalogowanych], pulverized into an environmentally safe, or are susceptible to consumer satisfaction. Polyvinyl alcohol (PVA) is itself the synthesis of biodegradable polymers in one, on the biodegradation of PVA began in the early '80s, l results have proved the biodegradability of PVA, and in the world, l particularly in developed countries are fully recognized. When you add starch and fiber waste into the environment after IPVF foam, because l is a natural polymer itself biodegradable, the microbes will first broken down starch and fiber, I hollowed out to make the foam skeleton, only PVA, the mechanical properties. This time due to decreased breakdown of the skeleton. When coupled with the biodegradability of PVA, the foam will rapidly degrade in the environment out. Several groups of experiments to do for the buffer performance test results are as follows: platenNominalActualNoominalActualImpactRebound sample Test; AccDisptimesmassareaareathickthicknessvelocityvelocityDeclmer (C) (mm) (kg) (cm2) (cm2) (mm) (mmJ (m / s) (m / s) 0 .7% fiber l15.0484.02l7.569.027.00.424.03.860.6l4% 4% starch 115.0484.0217.569.017.00.416.03.790.430.7% fiber starch 115.0484.0217.569.017.00.417.03.800.75 performance on the test sample buffer, the buffer that the sample performance is not good, not suitable for the transport package cushioning materials. but the development foam (such as PU, PS, etc.) costs are relatively high,[link widoczny dla zalogowanych], and PVF foam prices are low, has great potential economic benefits. so can be used as filling material for fixed packages, to meet the requirements as a packaging material. 44.3 Natural Polymers on Degradation of PVF foam according to numerous international conferences seminars, information on the definition of the development of plastic degradation in the following ways: (1) chemistry (molecular level) of the definition: the waste The chemical structure of a significant change, and ultimately completely degraded into carbon dioxide and water. luxuriant each portrait 5 / 65. Conclusion In the PVF to add natural polymer foam material, that is, starch and fiber, foam and mechanical properties of the degradation of both increased and improved, while filling in as a transport packaging materials, because of its low cost,[link widoczny dla zalogowanych], has practical value. With the development of China's packaging industry, more and more come to the fore packing foam, biodegradable develop better performance foam packaging foam will become the development trend of the future. References: [1] Zhang Yu, Li Changde foam - 'kfl, Hangzhou: Zhejiang Science and Technology Press, 2000 [2] Wushun Ying, XU Jing a foam molding, Beijing : Chemical Industry Press, 1999 [3] Ge Jin Jie and application of biodegradable polymers Chemical Industry Press, 2002 【4】 Liu Feng starch foam products of Chemical Industry Press 2000.2 [5] Hu Yujie natural Modification of Polymer Materials and Applied Chemistry Industry Press 2OOO.2 [6] Wang will only starch-based foam of Tianjin University of Science degree thesis 2004.3 [7】 Liu Yingchun starch based biodegradable materials of East China University Master Thesis 2003 .1

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