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Degradable ternary poly-beta-hydroxy butyrate and its prepn.

A hydroxybutyrate and blend technology, applied in the field of plastic processing and molding, can solve the problems of easy re-brittleness, high price, complicated process, etc., and achieve the effects of obvious sustainable development, wide application range and simple process

Inactive Publication Date: 2002-10-23
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The defect of the copolymerization method is that the process is relatively complicated and the price is relatively expensive; and in the above-mentioned binary blends, the second component PVA (polyvinyl alcohol) has a high melting temperature and is not easy to process, PE (polyethylene), PS (polystyrene Ethylene), PMMA (polymethyl methacrylate), etc. cannot be degraded. PEO (polyethylene oxide) improves the toughness of PHB more obviously, but PEO is easy to hydrolyze, and CAB (cellulose ester) has a better toughening and strengthening effect, but the total Mixture tends to re-brittle within a short period of time

Method used

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  • Degradable ternary poly-beta-hydroxy butyrate and its prepn.
  • Degradable ternary poly-beta-hydroxy butyrate and its prepn.
  • Degradable ternary poly-beta-hydroxy butyrate and its prepn.

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specific Embodiment approach 1

[0012] The specific embodiment 1, PHB / PEO / CAB ternary blend composition ratio (percentage by weight) 91 grams of poly(β-hydroxybutyrate), 4 grams of polyethylene oxide, 4 grams of cellulose acetate butyrate, auxiliary agent (nucleating agent, plasticizer, etc.) 1 g. 2. PHB / PEO / CAB ternary blend composition ratio (percentage by weight) 79 grams of poly(β-hydroxybutyrate), 10 grams of polyethylene oxide, 10 grams of cellulose acetate butyrate, auxiliary agent (nucleating agent, plasticizer, etc.) 1 g. 3. PHB / PEO / CAB ternary blend composition ratio (percentage by weight) 70 grams of poly(β-hydroxybutyrate), 10 grams of polyethylene oxide, 19 grams of cellulose acetate butyrate, auxiliary agent (nucleating agent, plasticizer, etc.) 1 g. 4. PHB / PEO / CAB ternary blend composition ratio (percentage by weight) 70 grams of poly(β-hydroxybutyrate), 19 grams of polyethylene oxide, 10 grams of cellulose acetate butyrate, auxiliary agent (nucleating agent, plastici...

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Abstract

The present invention is characterized by that 70-92% of poly(beta-hydroxybutyrate), 4-20% of polyethylene glycol oxide, 3.5-20% of cellulose ester and 0.5-2% of adjuvant are uniformly mixed, placed into mould with 60-90 deg.C, then placed in an oil press, and the mould is heated to 160-195 deg.C to make hot-press formation, its pressure is 7-12 MPa, and the time is 20-40 min., then and mould is cooled to below 60 deg.C and demoulded so as to obtain the invented poly(beta-hydroxybutyrate) three-component blend. The melting temp. of said three-component blend is reduced, its toughness is improved and its complete degradability is also retained.

Description

technical field [0001] The invention belongs to the field of plastic processing and molding. Background technique [0002] With the widespread use of plastics, environmental pollution caused by plastic waste has become one of the major problems facing modern society. The research of degradable plastics, especially the research and development of biodegradable plastics has become one of the hotspots in the research of new materials in the world. Poly(β-hydroxybutyrate) (PHB) is a kind of thermoplastic polyester, which has good biocompatibility and biodegradability, and can be used in daily life, medical field and environmental science field, etc. The crystallinity of poly(β-hydroxybutyrate) can reach more than 80%, so that the material itself is brittle and has poor impact resistance; at the same time, poly(β-hydroxybutyrate) is easy to decompose at high temperature, and the processing temperature range is narrow. This shortcoming limits i...

Claims

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Application Information

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IPC IPC(8): C08L67/04
Inventor 成国祥马世虎张立广王铁柱蔡志江
Owner TIANJIN UNIV
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