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Blend material of vinol/polylactic acid graft copolymer and starch, their preparing method and application

A technology of graft copolymer and polyvinyl alcohol, which is applied in the field of blended materials and their preparation, can solve the problems of decreased yield and increased production cost, and achieve the effects of easy control, improved toughness and reduced cost

Active Publication Date: 2008-07-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of solvents, although the product structure and component ratio can be controlled, the use of solvents and the precipitation and purification of final products inevitably lead to a decline in yield and an increase in production costs.

Method used

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  • Blend material of vinol/polylactic acid graft copolymer and starch, their preparing method and application
  • Blend material of vinol/polylactic acid graft copolymer and starch, their preparing method and application
  • Blend material of vinol/polylactic acid graft copolymer and starch, their preparing method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]Put 90 parts of polyvinyl alcohol (1799) and 10 parts of lactic acid into the reactor, swell at 70°C for 1.5 hours, add 0.5 parts of stannous chloride catalyst, and then dehydrate and copolymerize at 120°C for 3 hours to obtain polyethylene Alcohol / polylactic acid graft copolymer. The unreacted lactic acid monomer and polylactic acid homopolymer in the copolymer were extracted with toluene, dried in vacuum at 80°C for 48 hours, and the purified product was analyzed by NMR and differential scanning calorimetry. The results showed that the graft chain The degree of graft polymerization is 8, and the grafting rate is 31%. The glass transition temperature of the graft was 52°C and the melting point was 139°C.

Embodiment 2

[0036] Put 80 parts of polyvinyl alcohol (1788) and 20 parts of lactic acid into the reactor, after swelling at 85°C for 2 hours, add 4 parts of stannous octoate catalyst, and then dehydrate and copolymerize at 100°C for 5 hours to obtain polyvinyl alcohol / Polylactic acid graft copolymer. The unreacted lactic acid monomer and polylactic acid homopolymer in the copolymer were extracted with toluene, dried in vacuum at 80°C for 48 hours, and the purified product was analyzed by NMR and differential scanning calorimetry. The results showed that the graft chain The degree of graft polymerization is 5, and the grafting rate is 39%. The glass transition temperature of the graft was 53°C and the melting point was 138°C.

Embodiment 3

[0038] Put 30 parts of polyvinyl alcohol (0599) and 70 parts of lactic acid into the reactor, after swelling at 90°C for 2.5 hours, add 2.5 parts of zinc chloride catalyst, and then dehydrate and copolymerize at 125°C for 3.5 hours to obtain polyvinyl alcohol / Polylactic acid graft copolymer. The unreacted lactic acid monomer and polylactic acid homopolymer in the copolymer were extracted with toluene, dried in vacuum at 80°C for 48 hours, and the purified product was analyzed by NMR and differential scanning calorimetry. The results showed that the graft chain The degree of graft polymerization is 12, and the grafting rate is 43%. The glass transition temperature of the graft was 58°C and the melting point was 104°C.

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Abstract

This invention provides a polyvinyl alcohol / polylactic acid branch copolymer prepared directly from lactic acid and polyvinyl alcohol or from end-capped polylactic acid and polyvinyl alcohol. The copolymer has a glass transition temperature of 51~65 deg. C, a melting point of 104~165 deg. C and a molecular weight of 10000~600000. This invention also provides the blend of polyvinyl alcohol / polylactic acid copolymer and starch, its application and the method to prepare polyvinyl alcohol / polylactic acid copolymer. As the glass transition temperature and the melting point of the copolymer are of great difference, the copolymer can be used as a kind of completely biodegradable thermoplastics, which expands the application of polylactic acid. Addition of starch not only greatly lowers the cost but also accelerates the biodegradation of the copolymer. The blend of polyvinyl alcohol / polylactic acid copolymer and starch also performs good mechanical properties and can be especially made into membranes by direct blow molding.

Description

1. Technical field [0001] The invention belongs to the technical field of modification of polylactic acid and its blended material with starch and their preparation method and application, in particular to a polyvinyl alcohol / polylactic acid graft copolymer and its blended material with starch and their Methods of preparation, and uses as plastics. 2. Background technology [0002] Film products such as packaging bags, garbage bags, and agricultural mulch films are widely used in daily production and life, with a large amount of use and a short service life. Quite serious white pollution. This white pollution has attracted worldwide attention. In order to eliminate this white pollution, researchers at home and abroad are devoting themselves to the development of a new generation of plastic film products that not only have the excellent properties of plastics, but can also be completely degraded. [0003] Polylactic acid (PLA) is one of the aliphatic polyesters. Because of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02
Inventor 王玉忠郑长义汪秀丽杨科珂陈思翀周茜李芳丁颂东陈泽芳
Owner SICHUAN UNIV
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