CN102886950B - Anti-mildew modified atmosphere packaging film for fruits and vegetables and preparation method for mildew-proof modified atmosphere packaging film - Google Patents
Anti-mildew modified atmosphere packaging film for fruits and vegetables and preparation method for mildew-proof modified atmosphere packaging film Download PDFInfo
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Abstract
The invention discloses a method for preparing a fruit and vegetable anti-mildew modified atmosphere packaging film, which comprises (1) preparation of master batch; (2) preparation of the modified atmosphere packaging film; (3) preparation of nano zinc oxide coating liquid; and (4) fixation of the nano zinc oxide coating liquid. The nano zinc oxide coating liquid prepared in the step 3 stands for without light at a vacuum degree of 0.05-0.10MPa, and air bubble is discharged. The nano zinc oxide coating liquid after the air bubble is discharged is uniformly coated on the prepared modified atmosphere packaging film, and is exposed for 10-15min under an ultraviolet lamp with the light intensity of 500muW/cm<2>. Then the packaging film is lifted up and is dried for 3-5h at a temperature of 40 DEG C, then the fruit and vegetable anti-mildew modified atmosphere packaging film is obtained. The packaging film prepared by the method has an anti-oxidation function, an anti-fog function, an antibacterial function, an anti-mildew function and a fruit and vegetable respiration adjustment function, the refreshing time of fruits and vegetables can be prolonged, and the quality of the fruits and the vegetables can be improved.
Description
Technical field
The present invention relates to a kind of agricultural products fresh-keeping film, particularly relate to a kind of preparation method of fruits and vegetables mildewproof air-conditioning preservative film.
Background technology
Fruits and vegetables are the important non-staple food during people live, and are the second largest agricultural products being only second to grain, are the important source material of food industry.But because post-harvest fresh-keeping aseptic technic is poor, cause postharvest fruit and vegetable to lose up to 20% ~ 30%, and FAO's index is only 5%.
At present, domestic preserving fruit and vegetable utilizing mainly adopts the artificial air control storage of low temperature and uses inner wrapping preservative film pack.Low temperature artificial air control storage cost is high, investment large, and sells away rear consumer and can not continue use the method and carry out fresh-retaining preserving, the not easily penetration and promotion of this method; Inner wrapping preservative film is the most outstanding in packing effectively is coated with nano material exactly on preservative film, but the nano material skewness of coating, and particle is easily reunited, and does not reach good fresh-keeping effect.
Therefore, a kind of novel fruits and vegetables mildewproof air-conditioning preservative film of exploratory development, make the effect of its prolongation preserving fruit and vegetable utilizing phase both with conventional preservative film and raising fruit-vegetable quality, can reach again the bacteria mildew-proof effect that General Medicine can reach well, nano material can also be evenly distributed special crucial simultaneously.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method of mildewproof air-conditioning preservative film, and preservative film prepared by the method has good fresh-keeping anti-mold effect.
For this reason, technical scheme of the present invention is as follows:
A preparation method for fruits and vegetables mildewproof air-conditioning preservative film, wherein said fruits and vegetables mildewproof air-conditioning preservative film is prepared from by the component of following weight portion:
Described preparation method comprises the following steps:
(1) preparation of master batch:
Above-mentioned each raw material is joined in homogenizer in proportion, first with after the rotating speed stirring at low speed 1 ~ 2min of 50 ~ 80r/min, then with the rotating speed high-speed stirred 2 ~ 5min of 120 ~ 150r/min, obtains the compound mixed; By described compound after weighing, join in high speed twin-screw exhaust mixing extrusion comminutor and be processed into tie rod, described tie rod makes master batch through cold cut machine;
(2) preparation of air-conditioning preservative film: by even to obtained master batch and 3 kinds of remaining mixed with resin, enter through feed system the single-screw bar extrusion blow molding machine that diameter is 45 ~ 65mm, rotating speed is 35 ~ 45r/min, Blown Film at 160 DEG C ~ 180 DEG C;
(3) preparation of nano zine oxide coating fluid: zinc oxide 0.15 ~ 0.30g, Macrogol 4000 .05 ~ 0.08g, 2,2-methoxyl group-2-acetophenone initator 7 ~ 22g, distilled water 1L, mix, mechanical grinding 1 ~ 1.5h, obtains the nano zine oxide coating fluid that concentration is 0.15 ~ 0.30g/L;
(4) nano zine oxide coating fluid is fixing: nano zine oxide coating fluid lucifuge under the vacuum of 0.05 ~ 0.10MPa that step 3 is obtained leaves standstill, and gets rid of bubble; Be uniformly coated on obtained air-conditioning preservative film by draining the nano zinc oxide fluid dispersion spin coater after bubble, at light intensity 500 μ W/cm
2uviol lamp under exposure 10 ~ 15min; Then uncover preservative film and it is dried 3 ~ 5h at 40 DEG C, obtaining fruits and vegetables mildewproof air-conditioning preservative film.
Preferably, described fruits and vegetables mildewproof air-conditioning preservative film is prepared from by the component of following weight portion::
Described antioxidant is antioxidant 1076; Described antistatic additive is antistatic additive RLB-20/22; Described lubricant is paraffin or Tissuemat E; Described antifoggant is glycerin mono-fatty acid ester; Described calcium carbonate master batch is nanometer calcium carbonate superfine powder master batch.Silane coupler used is preferably adopted as vinyl, amino or isobutyl group one type of silane coupling agent
Wherein, the thickness of described fruits and vegetables mildewproof air-conditioning preservative film is 0.01-0.05mm, and the coating thickness of described nano zine oxide coating fluid is 1-5um.
Preservative film prepared by preparation method of the present invention and the method has the following advantages:
(1) employ UV-curing technology the nano zine oxide with antibacterial antisepsis is fixed on preservative film, and fixing evenly, particle do not reunite; In addition this technology also has the advantage of energy saving standard.
(2) calcium carbonate master batch added can form microcellular structure, enables food spontaneous controlled-atmosphere (oxygen, carbon dioxide, ethene etc.), can reach good anti-mildew fresh-keeping object.
(3) through performance of steam is good, does not substantially condense in sack.
(4) GB9687-1988 " food packaging products of polyethylene for food packaging sanitary standard " is met.
(5) transparency, pull resistance, tear resistance, flexibility, heat sealability etc. are functional.
(6) there is good sterilization, anticorrosion and antioxygenic property.
Detailed description of the invention
Below in conjunction with specific embodiment, packaging film of the present invention and preparation method thereof is described in detail.
In the following embodiments, calcium carbonate master batch used is the model that Xiamen Green Spring Environmental Technology Material Co., Ltd. produces is the nanometer calcium carbonate superfine powder master batch of AE-288.In actual production, also can select other suitable calcium carbonate superfine powder master batch.Silane coupler used is preferably adopted as vinyl, amino or isobutyl group one type of silane coupling agent.
Embodiment 1
Take each raw material according to the following ratio:
The method preparing fruits and vegetables mildewproof air-conditioning preservative film with above-mentioned raw materials is as follows:
(1) preparation of master batch:
Each raw material described above is joined in homogenizer in proportion, first with after the rotating speed stirring at low speed 2min of 60r/min, then with the rotating speed high-speed stirred 5min of 130r/min, obtains the compound mixed; By described compound after weighing, join in high speed twin-screw exhaust mixing extrusion comminutor and be processed into tie rod, described tie rod makes master batch through cold cut machine;
(2) preparation of air-conditioning preservative film: obtained master batch is even with 3 kinds of remaining mixed with resin, the single-screw bar extrusion blow molding machine that diameter is 45mm, rotating speed is 45r/min is entered through feed system, through Blown Film at 100 DEG C, 135 DEG C, 165 DEG C, 185 DEG C four sections of temperature, obtain the counterdie of fruits and vegetables anti-mildew fresh-keeping film;
(3) preparation of nano zine oxide coating fluid: zinc oxide 0.25g, Macrogol 4000 .05g, 2,2-methoxyl group-2-acetophenone initator 22g, distilled water 1L, mix, mechanical grinding 1.5h, obtain the nano zine oxide coating fluid that concentration is 0.25g/L;
(4) nano zine oxide coating fluid is fixing: nano zinc oxide fluid dispersion lucifuge under the vacuum of 0.085MPa that step 3 is obtained leaves standstill, and gets rid of bubble; Be uniformly coated on preservative film by draining the nano zinc oxide fluid dispersion spin coater after bubble, at light intensity 500 μ W/cm
2uviol lamp under expose 15min; Uncover preservative film and it is dried 5h at 40 DEG C, obtaining fruits and vegetables mildewproof air-conditioning preservative film.
Embodiment 2
Take each raw material according to the following ratio:
The method preparing fruits and vegetables mildewproof air-conditioning preservative film with above-mentioned raw materials is as follows:
(1) preparation of master batch:
Each raw material described above is joined in homogenizer in proportion, first with after the rotating speed stirring at low speed 2min of 80r/min, then with the rotating speed high-speed stirred 5min of 150r/min, obtains the compound mixed; By described compound after weighing, join in high speed twin-screw exhaust mixing extrusion comminutor and be processed into tie rod, described tie rod makes master batch through cold cut machine;
(2) preparation of air-conditioning preservative film: obtained master batch is even with 3 kinds of remaining mixed with resin, the single-screw bar extrusion blow molding machine that diameter is 65mm, rotating speed is 45r/min is entered through feed system, through Blown Film at 100 DEG C, 135 DEG C, 165 DEG C, 185 DEG C four sections of temperature, obtain the counterdie of fruits and vegetables anti-mildew fresh-keeping film;
(3) preparation of nano zine oxide coating fluid: zinc oxide 0.30g, Macrogol 4000 .08g, 2,2-methoxyl group-2-acetophenone initator 22g, distilled water 1L, mix, mechanical grinding 1.5h, obtain the nano zine oxide coating fluid that concentration is 0.25g/L;
(4) nano zine oxide coating fluid is fixing: nano zinc oxide fluid dispersion lucifuge under the vacuum of 0.085MPa that step 3 is obtained leaves standstill, and gets rid of bubble; Be coated on preservative film by draining the nano zinc oxide fluid dispersion spin coater after bubble, at light intensity 500 μ W/cm
2uviol lamp under expose 15min; Uncover preservative film and it is dried 5h at 40 DEG C, obtaining fruits and vegetables mildewproof air-conditioning preservative film.
Embodiment 3:
Take each raw material according to the following ratio:
The method preparing fruits and vegetables mildewproof air-conditioning preservative film with above-mentioned raw materials is as follows:
(1) preparation of master batch:
Each raw material described above is joined in homogenizer in proportion, first with after the rotating speed stirring at low speed 1min of 50r/min, then with the rotating speed high-speed stirred 2min of 120r/min, obtains the compound mixed; By described compound after weighing, join in high speed twin-screw exhaust mixing extrusion comminutor and be processed into tie rod, described tie rod makes master batch through cold cut machine;
(2) preparation of air-conditioning preservative film: obtained master batch is even with 3 kinds of remaining mixed with resin, the single-screw bar extrusion blow molding machine that diameter is 65mm, rotating speed is 45r/min is entered through feed system, through Blown Film at 100 DEG C, 135 DEG C, 165 DEG C, 185 DEG C four sections of temperature, obtain the counterdie of fruits and vegetables anti-mildew fresh-keeping film;
(3) preparation of nano zine oxide coating fluid: zinc oxide 0.15g, Macrogol 4000 .05g, 2,2-methoxyl group-2-acetophenone initator 7g, distilled water 1L, mix, mechanical grinding 1h, obtain the nano zine oxide coating fluid that concentration is 0.25g/L;
(4) nano zine oxide coating fluid is fixing: nano zinc oxide fluid dispersion lucifuge under the vacuum of 0.085MPa that step 3 is obtained leaves standstill, and gets rid of bubble; Be coated on preservative film by draining the nano zinc oxide fluid dispersion spin coater after bubble, at light intensity 500 μ W/cm
2uviol lamp under expose 10min; Uncover preservative film and it is dried 3h at 40 DEG C, obtaining fruits and vegetables mildewproof air-conditioning preservative film.
Fresh-keeping effect: fruits and vegetables mildewproof air-conditioning preservative film and the impact (0 DEG C at deposit) of common preservative film on Fuji apple quality see the following form:
Data as can be seen from upper table, fruits and vegetables mildewproof air-conditioning preservative film of the present invention with on market sell use preservative film compare, microbial growth can be controlled well, suppress the minimizing of ascorbic acid (Vc) and total phenol composition, reduce the rotting rate of fruit, there is the effect of obvious fresh-keeping mildew-resistant.
Claims (8)
1. a preparation method for fruits and vegetables mildewproof air-conditioning preservative film, wherein said fruits and vegetables mildewproof air-conditioning preservative film is prepared from by the component of following weight portion:
It is characterized in that, described preparation method comprises the following steps:
(1) preparation of master batch:
Above-mentioned each raw material is joined in homogenizer in proportion, first with after the rotating speed stirring at low speed 1 ~ 2min of 50 ~ 80r/min, then with the rotating speed high-speed stirred 2 ~ 5min of 120 ~ 150r/min, obtains the compound mixed; By described compound after weighing, join in high speed twin-screw exhaust mixing extrusion comminutor and be processed into tie rod, described tie rod makes master batch through cold cut machine;
(2) preparation of air-conditioning preservative film: by even to obtained master batch and 3 kinds of remaining mixed with resin, enter through feed system the single-screw bar extrusion blow molding machine that diameter is 45 ~ 65mm, rotating speed is 35 ~ 45r/min, Blown Film at 160 DEG C ~ 180 DEG C;
(3) preparation of nano zine oxide coating fluid: zinc oxide 0.15 ~ 0.30g, Macrogol 4000 .05 ~ 0.08g, 2,2-methoxyl group-2-acetophenone initator 7 ~ 22g, distilled water 1L, mix, mechanical grinding 1 ~ 1.5h, obtains the nano zine oxide coating fluid that concentration is 0.15 ~ 0.30g/L;
(4) nano zine oxide coating fluid is fixing: nano zine oxide coating fluid lucifuge under the vacuum of 0.05 ~ 0.10MPa that step 3 is obtained leaves standstill, and gets rid of bubble; Be uniformly coated on obtained air-conditioning preservative film by draining the nano zinc oxide fluid dispersion after bubble, at light intensity 500 μ W/cm
2uviol lamp under exposure 10 ~ 15min; Then uncover preservative film and it is dried 3 ~ 5h at 40 DEG C, obtaining fruits and vegetables mildewproof air-conditioning preservative film.
2. preparation method according to claim 1, is characterized in that: described in the ratio of each component is:
3. preparation method according to claim 1 and 2, is characterized in that: described lubricant is paraffin or Tissuemat E; Described calcium carbonate master batch is nanometer calcium carbonate superfine powder master batch; Silane coupler used is preferably adopted as vinyl, amino or isobutyl group one type of silane coupling agent.
4. preparation method according to claim 1 and 2, is characterized in that: described antioxidant is antioxidant 1076.
5. preparation method according to claim 1 and 2, is characterized in that: described antistatic additive is antistatic additive RLB-20/22.
6. preparation method according to claim 1 and 2, is characterized in that: described antifoggant is the one in glycerin mono-fatty acid ester, polysorbas20 and span 20.
7. preparation method according to claim 1 and 2, is characterized in that: the thickness of described fruits and vegetables mildewproof air-conditioning preservative film is 0.01-0.05mm.
8. preparation method according to claim 1 and 2, is characterized in that: the coating thickness of described nano zine oxide coating fluid is 1-5 μm.
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| CN103289168A (en) * | 2013-06-21 | 2013-09-11 | 苏州新区佳合塑胶有限公司 | Environmental protection antibacterial polyethylene film master batch |
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| CN104151671A (en) * | 2014-08-15 | 2014-11-19 | 吴江市德佐日用化学品有限公司 | Fruit-vegetable fresh-keeping plastic film |
| CN105086061A (en) * | 2015-08-05 | 2015-11-25 | 安徽顺彤包装材料有限公司 | Fruit and vegetable air-conditioning freshness protection bag and processing method thereof |
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| CN107814967B (en) * | 2017-11-06 | 2021-01-29 | 常德金德新材料科技股份有限公司 | Mildew-proof preservative film and preparation method thereof |
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| CN111716845B (en) * | 2020-04-30 | 2022-09-23 | 江阴申隆包装材料有限公司 | Fruit and vegetable packaging film for breath preservation |
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| CN114656665B (en) * | 2022-04-19 | 2023-06-27 | 江阴市德惠热收缩包装材料有限公司 | Fruit and vegetable fresh-keeping packaging film and preparation method thereof |
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