Natural polymer film material with adjustable degradation rate and preparation method

A natural polymer and film material technology, applied in the field of green and environment-friendly polymer film materials, can solve the problems of uncontrollable degradation rate, film without antibacterial or antibacterial components, high processing cost, etc., to achieve economic value and practical value, The effect of increasing the concentration range of the glue solution and reducing the processing cost

Inactive Publication Date: 2011-04-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three major problems in composite polymer film materials such as patent No. ZL02115925.4 with starch and konjac powder as the main raw materials: one is easily soluble in water, and the degradation rate is uncontrollable
Konjac flour is a soluble polymer that melts in water, which is not suitable for most packaging materials
Second, it is very easy to grow mold
Starch and konjac powder are both food-grade natural polymers. Their composite films do not have any antibacterial or antibacterial ingredients, and are very easy to be infected with mold. They should be exposed to humid air or in a natural environment for two to three months. Mold will grow every day, which is not suitable for most packaging materials
Third, the processing cost is higher
Patent No. ZL 03128327, a blend film and its preparation method and application, involving a composite film blended with konjac glucomannan and poly(4-ethylene-N-alkylpyridine) quaternary ammonium salt, the raw material of this type of film higher cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022]A method for preparing a natural polymer film material with an adjustable degradation rate. The components and mass percentages of the film material are: 35-50% starch, 5-30% konjac powder, 0.1-5% glycerin, and 15-60% modified additives %; it is characterized in that: the components included in the modified additive and the percentage of the total mass of the membrane material are: 5% to 55% of water, 5 to 10% of lactic acid, and 0.001 to 1 %, the preparation method of the film material is: mixing-microwave-casting-setting process; the water content is 5% to 55%, and the specific value is related to the drying process during preparation and the air humidity during use; the characteristics of starch Yes: at least one of natural starch and soluble starch; wherein the characteristic of natural starch is: it is pure natural starch without any modification treatment, extracted from one of potato, cassava, pea, corn, or sweet potato; Among them, the characteristics of konjac p...

Embodiment 1

[0033] Example 1: dilute 50ml lactic acid with 2000ml water, add dilute lactic acid solution after mixing 30g potato starch and 20g konjac powder, add 20ml glycerin after stirring for 10 minutes, and stir for 5 minutes; the above-mentioned mixed glue is heated to boiling by microwave 5 minutes; filter (200 mesh), place under a negative pressure of 400-500 mm Hg for defoaming; stir and preheat to 70 ° C, evenly distribute on the casting plate through the nozzle of the casting equipment, and dry at 90 ° C film; then above-mentioned casting film is soaked in the sizing agent (25% concentration ammonia water and 99.7% concentration ethanol are mixed and prepared by volume ratio 1:5) solution for 12 hours, rinse 3 times with clear water (each soaking 30 minutes), After drying, the natural polymer film material with adjustable degradation rate can be obtained (the water content reaches 5% to 55%, and the specific value is related to the drying process and air humidity).

Embodiment 2

[0034] Embodiment 2: Dilute 40ml lactic acid with 2000ml water, add dilute lactic acid solution after mixing 40g cornstarch and 15g konjac fine powder, add 30ml glycerin after stirring for 10 minutes, stir for 5 minutes again; Above-mentioned mixed glue is carried out microwave heating to boiling 5 minutes; filter (200 mesh), place under a negative pressure of 400-500 mm Hg for defoaming; stir and preheat to 70 ° C, evenly distribute on the casting plate through the nozzle of the casting equipment, and dry at 90 ° C film; then above-mentioned casting film is soaked in the sizing agent (25% concentration ammonia water and 99.7% concentration ethanol are mixed and prepared by volume ratio 1:5) solution for 12 hours, rinse 3 times with clear water (each soaking 30 minutes), After drying, the natural polymer film material with adjustable degradation rate can be obtained (the water content reaches 5% to 55%, and the specific value is related to the drying process and air humidity). ...

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Abstract

The invention discloses a natural polymer film material with an adjustable degradation rate and a preparation method, which belongs to the technical field of environmentally-friendly polymer film materials. The natural polymer film material comprises the following components in percentage by mass: 5 to 55 percent of water, 35 to 50 percent of natural starch, 5 to 30 percent of konjac fine flour, 5 to 10 percent of lactic acid, 0.1 to 5 percent of glycerin, and 0.001 to 1 percent of tackifier prepared from ammonia water and ethanol. Rich food-grade natural polymer materials, such as the natural starch, the konjac fine flour and the like, form a main raw material source, so the film material does not damage a human body, and can be completely degraded under natural conditions. Process parameters in a process comprising mixing, microwave treatment, curtain coating and sizing are adjusted to realize regulation and control over the degradation rate of the film material, greatly reduce the viscosity of glue solution, expand the viscosity range of the glue solution, reduce the processing cost of the film and avoid detriments to the environment. The film can be widely applied to packaging, food preservation, beauty masks, agricultural mulching films, medical consumables, hygienic products, biochemical isolation or dialysis, and the like.

Description

technical field [0001] The invention relates to a natural polymer film material with adjustable degradation rate and a preparation method thereof. The film material can be widely used in packaging, food preservation, beauty mask, agricultural mulching film, medical consumables, sanitary products, biochemical isolation or dialysis, etc. It belongs to the technical field of green and environment-friendly polymer film materials. Background technique [0002] Since the beginning of the 21st century, petrochemical resources such as petroleum and coal have been decreasing day by day, and the waste of some polymer materials and the volatilization of organic solvents coexist with it, which increasingly threatens the environment on which human beings depend. With the development of industry, chemically synthesized plastic products are widely used in the fields of food packaging and fresh-keeping because of their low price and stable properties. After use, they are difficult to degrad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L5/02C08K5/053C08K5/09C08J5/18C08J3/24
Inventor 陈庆华黄林黄明华李维艳
Owner KUNMING UNIV OF SCI & TECH
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