A kind of preparation method of chitin liquefaction product/polyvinyl alcohol blend film

A liquefied product, polyvinyl alcohol technology, applied in the field of preparation of chitin liquefied product/polyvinyl alcohol blend film, can solve the problems of limited application range, poor heat resistance, no antibacterial properties, etc., to avoid stress defects, Better Performance, Enhanced Flexibility Effects

Active Publication Date: 2020-05-19
HAINAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polyvinyl alcohol is mainly used in the preparation of blended films, hydrogels and packaging materials, but affected by the preparation process and material structure, polyvinyl alcohol films have the disadvantages of poor heat resistance, no flexibility and no antibacterial properties, which greatly limit its scope of application

Method used

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  • A kind of preparation method of chitin liquefaction product/polyvinyl alcohol blend film
  • A kind of preparation method of chitin liquefaction product/polyvinyl alcohol blend film
  • A kind of preparation method of chitin liquefaction product/polyvinyl alcohol blend film

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preparation example Construction

[0027] see figure 1 . The invention discloses a preparation method of a chitin liquefaction product / polyvinyl alcohol blend film, which comprises the following steps:

[0028] S1: Mix polyol, acidic catalyst and chitin powder, react at 140°C-180°C for 60min-120min, then filter and rotary steam to obtain chitin liquefaction product. Wherein, the consumption of polyhydric alcohol, acidic catalyst and chitin is calculated by mass parts: polyhydric alcohol: 50 parts-75 parts, acidic catalyst: 2 parts-6 parts, chitin: 10 parts; Polyhydric alcohol can be ethylene glycol, Or diethylene glycol, or glycerol, or one or more mixed solutions in polyethylene glycol, and the acidic catalyst can be formic acid, or acetic acid, or oxalic acid, or hydrochloric acid, or the concentrated sulfuric acid. The liquefaction step is a chemical reaction of the polyol under the action of an acidic catalyst, which breaks the macromolecular chitin solid powder into small molecules and transforms it into...

Embodiment 1

[0037] The mixed solution of 7g polyethylene glycol and glycerol (mass ratio of polyethylene glycol and glycerol is 4:1, wherein the molecular weight of polyethylene glycol is 400) and 0.5g vitriol oil are mixed homogeneously in there-necked flask, Add 1g of chitin, stir, and react at 160°C for 90 minutes to obtain 8g of liquefied product; 64g of polyvinyl alcohol and 1600g of deionized water are heated at 90°C for 2 hours, then filtered, and left to defoam to obtain a polyvinyl alcohol solution; Mix 8g of liquefied product with 1664g of polyvinyl alcohol solution at 65°C, and continue to stir for 3h; pour the mixed solution on a glass plate model, spread the film by casting method, and cure it at room temperature for 24h, and the cured blended film After rinsing in ethanol, put it out and let it dry naturally.

[0038] The appearance of the chitin liquefied product / polyvinyl alcohol blend film obtained is a light yellow film, and its technical indicators are as follows:

[0...

Embodiment 2

[0045] The mixed solution of 7g polyethylene glycol and glycerol (mass ratio of polyethylene glycol and glycerol is 4:1, wherein the molecular weight of polyethylene glycol is 400) and 0.5g, 98% concentrated sulfuric acid in a three-necked flask Mix evenly, add 1g of chitin, stir, place at 160°C for 90min to obtain 8g of liquefied product; change the quality of polyvinyl alcohol, take 32g of polyvinyl alcohol and 800g of deionized water, heat at 90°C for 2h, and then filter , standing for defoaming to obtain polyvinyl alcohol solution; mix 8g of liquefied product with 832g of polyvinyl alcohol solution at 65°C, and continue to stir for 3h; After being cured for 24 hours, the cured blended film was rinsed in ethanol and taken out to dry naturally.

[0046] The appearance of the chitin liquefied product / polyvinyl alcohol blend film obtained is a light yellow film, and its technical indicators are as follows:

[0047] 24h swelling rate: 1.09g / g

[0048] Tensile strength: 34.76M...

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Abstract

The invention discloses a preparation method of a chitin liquefied product / polyvinyl alcohol blend film. The preparation method includes the steps of: S1) mixing polyol, an acidic catalyst and chitin powder and performing a reaction for 60-120 min at 140-180 DEG C, and filtering and spin-evaporating the reaction liquid to obtain the chitin liquefied product; S2) stirring and mixing the chitin liquefied product with a polyvinyl alcohol solution at certain ratio at 40-70 DEG C to prepare a chitin liquefied product / polyvinyl alcohol mixture liquid; and S3) performing film forming and curing to the chitin liquefied product / polyvinyl alcohol mixture liquid; S4) rinsing the cured thin film in the step S3) with a polar small-molecular solvent and naturally air-drying the film. The chitin liquefied product / polyvinyl alcohol blend film is prepared from chitin, which is a main component in shrimp and crab shells; the product has a transparent light yellow color, has excellent heat resistance, mechanical performance, antibacterial performance and environmental friendliness, and may be applied as a novel package material.

Description

technical field [0001] The invention relates to the field of polymer materials, more specifically, to a preparation method of a chitin liquefied product / polyvinyl alcohol blend film. Background technique [0002] With the rapid development of the seafood processing industry, the resulting seafood waste is also increasing. In order to realize the resource utilization of seafood waste, mainly shrimp and crab shell waste, more and more scholars at home and abroad have received more and more attention. extensive attention. As one of the main components of shrimp and crab shell waste, chitin has the advantages of renewability, biodegradability, biocompatibility and antibacterial properties, making it have broad application prospects in the fields of industry, agriculture and environmental protection. However, at present, seafood waste is only used to produce low-value-added products such as feed and fertilizer, and some of them are even discarded as waste. This not only wastes r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08L5/08C08K5/053C08J5/18
CPCC08J5/18C08J2329/04C08J2405/08C08L29/04C08L2201/08C08L5/08C08K5/053
Inventor 张玉苍许文茸张洁李瑞松
Owner HAINAN UNIV
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