CN105032219A - Polypropylene base-chitosan/gelatin composite film preparing method - Google Patents
Polypropylene base-chitosan/gelatin composite film preparing method Download PDFInfo
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- CN105032219A CN105032219A CN201510557516.0A CN201510557516A CN105032219A CN 105032219 A CN105032219 A CN 105032219A CN 201510557516 A CN201510557516 A CN 201510557516A CN 105032219 A CN105032219 A CN 105032219A
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Abstract
The invention discloses a polypropylene base-chitosan/gelatin composite film preparing method. The preparing method includes the following steps that a chitosan/gelatin mixed solution system is prepared, filtering, standing, defoaming and the like are conducted on the mixed solution system, the processed mixed solution system is arranged on the surface of polypropylene non-woven fabric in a coating mode, and a polypropylene base-chitosan/gelatin composite film is obtained after drying, neutralizing, airing and the like are conducted. The composite film prepared through the method has a stable structure and good breakage strength, has certain absorption function on heavy metal ions and is mainly applied to the field of waste water treatment.
Description
Technical field
The present invention relates to field of waste water treatment, particularly relate to a kind of preparation method of polypropylene-base ~ shitosan/synthesized thin film.
Background technology
Polypropylene non-woven fabric (PPnon ~ wovenfabric) has high strength, high temperature resistant, ageing-resistant, the performance such as uvioresistant, nontoxic and good chemical stability.As a kind of filter medium, polypropylene non-woven fabric is widely used in wastewater treatment.But polypropylene non-woven fabric hydrophily is poor, when being used for wastewater treatment as membrane module, damage ratio is comparatively serious, and in addition, polypropylene non-woven fabric does not have the object of process to the heavy metal ion in waste water.
Shitosan, as the deacetylated product of the second largest natural biological polysaccharide chitin found so far, has good adsorptivity and film forming, is a kind of nontoxic, free of contamination renewable resource.As film sorbing material, the great amount of hydroxy group that chitosan film surface is contained and amino can be combined with anions and canons, thus reach the object of absorption.The structural formula of shitosan is as follows:
But pure chistosan film cost is relatively high, and intensity is poor, this directly affects efficiency and the economy of chitosan film adsorption process.
Summary of the invention
The present invention is directed to the defect of prior art, be intended to the preparation method proposing a kind of polypropylene-base-shitosan/synthesized thin film.
The present invention solves the problems of the technologies described above by the following technical solutions: a kind of preparation method of polypropylene-base-shitosan/synthesized thin film, it is in the acetic acid aqueous solution of 1 ~ 5% that the Chitosan powder that described preparation method comprises the steps: to take 1 ~ 5g is added to 99 ~ 95g mass fraction, abundant stirring 1 ~ 8h, obtained mass fraction is the chitosan solution of 1% ~ 5%; Add the gelatin of 5 ~ 50g to described chitosan solution, under the condition of 50 ~ 80 DEG C, uniform stirring 30 ~ 80min, obtained shitosan/gelatin mixed solution system; Described mixed solution system carried out filter, leave standstill, after deaeration process, be coated on polypropylene non-woven fabric, coating layer thickness is 0.5 ~ 10mm; Film after coating is put into baking oven, dry process 5 ~ 8min at 50 ~ 70 DEG C, after taking-up, be the NaOH solution neutralization of 2% with mass fraction, at room temperature dry, obtained polypropylene-base ~ shitosan/synthesized thin film.
Preferably: in described acetic acid solution, the mass fraction of acetic acid is 2%.
Preferably: the addition of described Chitosan powder is 2g, the addition of described gelatin is 10 ~ 50g.
Preferably: the addition of described gelatin is 30g, the addition of described Chitosan powder is 1 ~ 5g.
Preferably: the thickness of described coating is 2mm.
The present invention mixes with the gelatin with good biocompatibility by selecting the shitosan with good biocompatibility, hydrophily and adsorptivity, prepare shitosan/gelatin mixed solution system, by this mixed solution system through filtering, leaving standstill, the process such as deaeration, be coated in polypropylene non-woven fabric surface, again through super-dry, neutralize and the process such as to dry after, obtained polypropylene-base-shitosan/synthesized thin film.
Polypropylene-base-shitosan/synthesized thin film prepared by the present invention has stable structure, good fracture strength, heavy metal ion have certain adsorbing advantage, is mainly used in field of waste water treatment.
Accompanying drawing explanation
Fig. 1 be the present invention with gelatin consumption for variable, the composite membrane fracture strength of mensuration is the curve map of change with the change of gelatin consumption.
Fig. 2 is the present invention take chitosan dosage as variable, and the composite membrane of mensuration changes and the curve map of change with chitosan dosage Cr VI adsorbance.
Detailed description of the invention
Below in conjunction with instantiation, the present invention is described in detail; should understand; embodiment is only for illustration of the present invention, instead of for limiting the present invention, any amendment, equivalent replacement etc. made on basis of the present invention is all in protection scope of the present invention.
Embodiment 1
Different gelatin consumption is on the experiment of the impact of composite membrane fracture strength:
It is in the acetic acid solution of 2% that the Chitosan powder taking 2g is added to 98g mass fraction, and fully stir 3h, preparation quality mark is the chitosan solution of 2%; Add the gelatin of 10g, 20g, 30g, 50g respectively to described chitosan solution, under the condition of 60 DEG C, uniform stirring 50min, prepares shitosan/gelatin mixed solution system; Described mixed solution system carried out filter, leave standstill, the process such as deaeration, be coated on polypropylene non-woven fabric, coating layer thickness is 2mm; Film after coating is put into baking oven, and at 70 DEG C, dry process 5min, after taking-up, is in the NaOH solution of 2% with mass fraction and 30min, dries at ambient temperature, obtained polypropylene-base-shitosan/synthesized thin film.
Composite membrane is cut into the sample of 10cm × 5cm, adopts the assay method in national standard (GB/4456 – 84) to measure, test the ultimate strength (N/mm) of each hybridized film.
From Fig. 1 curve, the ultimate strength of composite membrane significantly improves along with the consumption increase of gelatin, and this is due to shitosan, after gelatin mixing, there is stronger hydrogen bond action each other, the brute force of composite membrane is increased.
Embodiment 2
Different shitosan addition is on the experiment of the impact of composite membrane absorption Cr VI performance:
It is in the acetic acid solution of 2% that the Chitosan powder taking 1g, 2g, 3g, 4g, 5g is respectively added to 98g mass fraction, and fully stir 3h, preparation quality mark is the chitosan solution of 1%, 2%, 3%, 4%, 5%; Add the gelatin of 30g to described chitosan solution, under the condition of 60 DEG C, uniform stirring 50min, prepares shitosan/gelatin mixed solution system; Described mixed solution system carried out filter, leave standstill, the process such as deaeration, be coated on polypropylene non-woven fabric, coating layer thickness is 2mm; Film after coating is put into baking oven drying process 5min, after taking-up, be in the NaOH solution of 2% with mass fraction and 30min, dry at ambient temperature, obtained composite membrane.
In the conical flask of a series of 50mL, add 25mL concentration is respectively standard C r VI solution of 1mg/L and the composite membrane of 0.1g, and at room temperature vibrate, the reaction time is 120min.Adopt the content remaining Cr VI in spectrophotometry conical flask.The adsorbance of Cr VI is calculated according to the initial concentration of Cr VI and the difference of equilibrium concentration.The formula of the adsorbance Q (mg/g) of Cr VI is as follows:
Wherein C
orepresent initial concentration and equilibrium concentration (mg/L) respectively with Cf, V represents liquor capacity (L), and M represents the use amount of adsorbent.
From Fig. 2 curve, the adsorbance of composite membrane to Cr VI constantly increases with the increase of chitosan dosage; When chitosan dosage is 3g, composite membrane is 3.2mg/g to the adsorbance of Cr VI; When the consumption of shitosan is more than 3g, along with the increase of chitosan dosage, the adsorbance of composite membrane to Cr VI tends to balance.This is because along with the increase of chitosan dosage, the adsorption group of composite film surface increases, and causes the reinforcement of adsorption capacity; When the consumption of composite membrane is increased to certain value, the chelation between the Cr VI in the adsorption group of composite film surface and solution reaches dynamic equilibrium, and after continuing to increase consumption, the adsorption capacity of composite membrane to Cr VI is no longer strengthened, and tends to balance.
Claims (5)
1. the preparation method of polypropylene-base-shitosan/synthesized thin film, it is characterized in that, it is in the acetic acid aqueous solution of 1 ~ 5% that the Chitosan powder that described preparation method comprises the steps: to take 1 ~ 5g is added to 99 ~ 95g mass fraction, abundant stirring 1 ~ 8h, obtained mass fraction is the chitosan solution of 1% ~ 5%; Add the gelatin of 5 ~ 50g to described chitosan solution, under the condition of 50 ~ 80 DEG C, uniform stirring 30 ~ 80min, obtained shitosan/gelatin mixed solution system; Described mixed solution system carried out filter, leave standstill, after deaeration process, be coated on polypropylene non-woven fabric, coating layer thickness is 0.5 ~ 10mm; Film after coating is put into baking oven, dry process 5 ~ 8min at 50 ~ 70 DEG C, after taking-up, be the NaOH solution neutralization of 2% with mass fraction, at room temperature dry, obtained polypropylene-base ~ shitosan/synthesized thin film.
2. the preparation method of a kind of polypropylene-base-shitosan/synthesized thin film according to claim 1, it is characterized in that, in described acetic acid aqueous solution, the mass fraction of acetic acid is 2%.
3. the preparation method of a kind of polypropylene-base-shitosan/synthesized thin film according to claim 1, it is characterized in that, described Chitosan powder addition is 2g, and the addition of described gelatin is 10 ~ 50g.
4. the preparation method of a kind of polypropylene-base-shitosan/synthesized thin film according to claim 1, is characterized in that, the addition of described gelatin is 30g, and the addition of described Chitosan powder is 1 ~ 5g.
5. the preparation method of a kind of polypropylene-base-shitosan/synthesized thin film according to claim 1, is characterized in that, the thickness of described coating is 2mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108620036A (en) * | 2018-06-29 | 2018-10-09 | 成都纺织高等专科学校 | It is a kind of to be used to adsorb binary blend of coloring agent and preparation method thereof |
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2015
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108620036A (en) * | 2018-06-29 | 2018-10-09 | 成都纺织高等专科学校 | It is a kind of to be used to adsorb binary blend of coloring agent and preparation method thereof |
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