CN103881212A - Food preservation film and preparation method thereof - Google Patents
Food preservation film and preparation method thereof Download PDFInfo
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- CN103881212A CN103881212A CN201410114181.0A CN201410114181A CN103881212A CN 103881212 A CN103881212 A CN 103881212A CN 201410114181 A CN201410114181 A CN 201410114181A CN 103881212 A CN103881212 A CN 103881212A
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- 238000009920 food preservation Methods 0.000 title abstract 5
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- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 description 1
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- HWGNBUXHKFFFIH-UHFFFAOYSA-I pentasodium;[oxido(phosphonatooxy)phosphoryl] phosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O HWGNBUXHKFFFIH-UHFFFAOYSA-I 0.000 description 1
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- UNXRWKVEANCORM-UHFFFAOYSA-I triphosphate(5-) Chemical compound [O-]P([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O UNXRWKVEANCORM-UHFFFAOYSA-I 0.000 description 1
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Images
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/092—Polycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/10—Esters; Ether-esters
- C08K5/11—Esters; Ether-esters of acyclic polycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
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Abstract
The invention provides a food preservation film. The food preservation film comprises the following raw materials: a high polymer resin base film and an active ingredient; the mass concentration of the active ingredient ranges from 0.1% to 0.5%; the high polymer resin base film comprises one of LDPE (Low-Density Polyethylene), PP (Poly Propylene) and EVOH (Ethylene Vinyl Alcohol copolymer); and the active ingredient comprises a mixture of Butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT) in a mass ratio of 1: 1. The food preservation film is capable of effectively retarding the oxidization of chilled fresh pork, inhibiting the juice loss of the chilled fresh pork and also sterilizing in a temperature range of 0 to 4 DEG C, and therefore, the storage period of the chilled fresh pork product can be effectively prolonged, the cost can be reduced, and the problems of the flavor change of the pork products, the loss of nutrient substances and low safety caused by the traditional food preservation films also are solved.
Description
Technical field
The present invention relates to plastic wrapping technical field, relate in particular to a kind of food fresh keeping membrane and preparation method thereof.
Background technology
Along with social development, it is fresh-keeping that increasing food need to adopt preservation technique to carry out, and traditional preservative film uses polypropylene (Polypropylene conventionally, hereinafter to be referred as: PP), or ethylene-vinyl alcohol copolymer (Ethylene vinyl alcohol, hereinafter to be referred as: EVOH), or Low Density Polyethylene (Low Density Polyethylene, hereinafter to be referred as: LDPE) for raw material is after twin screw extruder is extruded, entering single screw rod inflation film manufacturing machine blown film makes again, because traditional preservative film is in the process of preparation, can be inevitably and twin screw extruder, the equipment contact that single screw rod inflation film manufacturing machine etc. contains metal, and metal is while contacting with the raw material of preparing preservative film, metal ion will play catalyst for oxidation reaction effect, therefore, can reduce the fresh-keeping effect of preservative film, in addition, but also there will be the colour generation effect being caused by metal ion.
Summary of the invention
The object of the invention is to solve the defect that above-mentioned prior art exists, a kind of new preservative film for food is provided, this preservative film can effectively extend the shelf lives of cold fresh meat product.
A kind of food fresh keeping membrane, its raw material comprises polymeric resin matrix film and activeconstituents; The mass concentration of described activeconstituents is 0.1%-1.0%;
Described macromolecule resin basement membrane comprises the one in LDPE, PP, EVOH; Described activeconstituents comprises that mass ratio is butylated hydroxy anisole (the Bottom Hole Assembly of 1:1, hereinafter to be referred as: BHA) with 2,6-di-tert-butyl-4-methy phenol (butylated hydroxytoluen, hereinafter to be referred as: mixture BHT).
Further, food fresh keeping membrane as above, described activeconstituents comprise tartrate (tartaric acid, hereinafter to be referred as: TA), the mass ratio of described BHA:BHT:TA is 1:1:1.
Further, food fresh keeping membrane as above, the mass concentration of described activeconstituents is 0.5%.
A preparation method for food fresh keeping membrane, comprises the following steps:
(1), prepare activeconstituents, the BHA that is 1:1 by mass ratio and BHT, mix the homogeneous activeconstituents required for the present invention that obtains;
(2), preparation modification, the activeconstituents that the macromolecule resin basement membrane of drying in 80 DEG C of baking ovens is in advance made with step 1 mixes fully, stirs homogeneously, passes through that twin screw extruder heats, shears, extrudes, pelletizing finally makes modified resin; Wherein, described macromolecule resin basement membrane comprises one or more in LDPE, PP, EVOH; The mass concentration of described activeconstituents is 0.1%-1.0%;
(3) modified resin, step 2 being made is prepared into food fresh keeping membrane of the present invention by single screw rod inflation film manufacturing machine blown film.
Further, the preparation method of food fresh keeping membrane as above, in described step 1, activeconstituents also comprises TA, the mass ratio of described BHA, BHT, TA is 1:1:1.
Further, the preparation method of food fresh keeping membrane as mentioned above, in step 2, while preparing modified resin, described twin screw extruder is provided with seven heating zone from entrance successively to outlet, and wherein, district's Heating temperature is 165 DEG C, two district's Heating temperatures are 185 DEG C, three district's Heating temperatures are 190 DEG C, and four district's Heating temperatures are 190 DEG C, and five district's Heating temperatures are 180 DEG C, six district's Heating temperatures are 175 DEG C, and seven district's Heating temperatures are 170 DEG C.
Further, the preparation method of food fresh keeping membrane as mentioned above, in the time not containing TA in activeconstituents, in step 3, when blown film, single screw rod inflation film manufacturing machine is disposed with four heating zone from entrance to outlet, wherein, one district's Heating temperature is 150 DEG C, two district's Heating temperatures are 185 DEG C, and three district's Heating temperatures are 190 DEG C, and four district's Heating temperatures are 198 DEG C.
Further, the preparation method of food fresh keeping membrane as mentioned above, in the time containing TA in activeconstituents, in step 3, when blown film, single screw rod inflation film manufacturing machine is disposed with four heating zone from entrance to outlet, wherein, one district's Heating temperature is 160 DEG C, two district's Heating temperatures are 180 DEG C, and three district's Heating temperatures are 180 DEG C, and four district's Heating temperatures are 175 DEG C.
Further, the preparation method of food fresh keeping membrane as mentioned above, the screw rod speed of rotation of described twin screw extruder, single screw rod inflation film manufacturing machine is 40r/min.
LDPE main application is to make film product, and its material is transparent, situation that can very clear packaging product; There is the characteristic of moisturizing, can reduce the moisture loss of product, increase freshness; It is ventilative, can play the effect of spontaneous controlled atmosphere, extends fresh keeping time; Its stopping property, can protect product not contaminated; And its cheap price also makes its application prospect very wide.
PP is a kind of thermoplastic resin being made by propylene polymerization, its relative density is little, be only 0.89-0.91, it is one of kind the lightest in plastics, and have good mechanical property, except shock-resistance, other mechanical properties are all good than polyethylene, the most outstanding performance is exactly counter-bending fatigability, is commonly called as polypropylene (PP).Moulding processability is good.Have higher thermotolerance, use temperature can reach 110-120 DEG C continuously.Chemical property is good, and water suction, does not react with most pharmaceutical chemicalss hardly.Quality is pure, nontoxicity.In addition, the transparency of polypropylene articles is better than the transparency of high density polyethylene(HDPE) goods.
EVOH combines the iris action of polyvinyl processibility and vinyl alcohol polymer, and EVOH not only shows fabulous processing characteristics, and gas, smell, spices, solvent etc. are presented to excellent blocking effect.The distinguishing feature of EVOH resin is its iris action to gas, and it is used in packaging structure, by preventing that the infiltration of oxygen from improving the reserving degree of fragrance and quality.In use gas flush packaging technology, EVOH resin has retained the carbonic acid gas or the nitrogen that are used for protecting product effectively.EVOH resin also has very strong oil-proofness and organic solvent resistance.EVOH resin also has high physical strength, elasticity, surface hardness, wear resistance and weathering resistance, and has strong static resistance.EVOH film has high gloss and low haze, thereby highly transparent.EVOH resin is in the strong barrier resin of all commercializations, the resin that thermostability is the highest, and this character can be regenerated and recycle the waste material producing in processing, contains nearly 20% EVOH in reworked material.
BHA is a kind of fat-soluble antioxidant, and its fusing point is at 48-63 DEG C, and boiling point, at 264-270 DEG C (98KPa), is soluble in ethanol (25g/100mL, 25 DEG C), propylene glycol and grease, water insoluble.BHA is to thermally-stabilised, is difficult for destroyedly under weak base condition, and not painted with Action of Metal Ions, because the preparation process of preservative film will experience the high temperature of the highest 200 DEG C, its advantage that can use under hot conditions can ensure that its performance can not be subject to too large impact.BHA is as fat-soluble antioxidant, suitable fatty foods and fat-rich food.BHA can stablize the pigment of raw beef and suppress the oxidation of ester compound.BHA is combined with tripoly phosphate sodium STPP and xitix that can to delay freezing pork chop putrid and deteriorated.BHA can mix with other fat-soluble antioxidants use, its better effects if.As being used in conjunction with, BHA and 2BHT can protect carp meat, chicken, pork etc.
BHT can keep freshness, nutritive ingredient, taste, the color with stabilizing food product, improves the stability of liposoluble vitamin.The cake, fried food product, the meat product that can be used for edible animals and plants grease, rich fat, prevent that becoming sour of food is spoiled, extends preservation period.It is compared with other antioxidants, and stability is higher, and antioxidant effect is better, good heat resistance.And add BHT in plastics film, can effectively prevent that polymer materials is because of going bad that oxidation causes.
TA can make food have tart flavour as the anti-oxygen agent of food ﹐, because of the characteristic of BHA and alkaline-earth metal ions effect variable color, inevitably can see with metallic contact (BHA will contact with metal screw in the preparation process of preservative film) in use, the present invention will have the TA of metal ion chelation mixed with BHA, can not only play the synergism of fresh-keeping effect, the colour generation effect that can also prevent from being caused by metal ion (is above-mentioned BHA and alkaline-earth metal ions effect and the characteristic of variable color, the colour generation effect of metal ion refer to metal ion with containing the equiatomic characteristic color presenting because of transfer transport during without color reagent effect of aerobic nitrogen sulphur), and in the catalyst for oxidation reaction effect that to a certain degree can also avoid metal ion to play.
Food fresh keeping membrane provided by the invention can effectively delay cold fresh meat oxidation within the scope of 0～4 DEG C, suppress its juice loss, and play germicidal action, can effectively extend the shelf lives of cold fresh meat product, reduce costs, and overcome the change of traditional food fresh keeping membrane to meat product local flavor, loss and the low problem of security of nutritive substance.
Brief description of the drawings
Fig. 1 is preservative film A-F group of the present invention and the pH value correlation curve figure of control group G-I preservative film under same time;
Fig. 2 preservative film A-F group of the present invention and the total volatile basic nitrogen correlation curve figure of control group G-I preservative film under same time.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below technical scheme in the present invention be clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
Choosing activeconstituents is that BHA, BHT and TA are used in conjunction with, and three's mass ratio is 1:1:1, and three's mass concentration is 0.5%, and all the other are LDPE.The total amount of activeconstituents and LDPE is defined as 500g, and BHA, BHT and TA quality are 2.5g, and LDPE quality is 492.5g.In advance 492.5gLDPE is dried under 80 DEG C of conditions, after homogeneous LDPE and the described activeconstituents stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane A through single screw rod inflation film manufacturing machine.
Embodiment 2:
Choose activeconstituents BHA and BHT and be used in conjunction with, and mass concentration is 0.5%, both mass ratioes are: 1:1, all the other are LDPE.Activeconstituents and LDPE total amount are defined as 500g, and BHA and BHT quality are 2.5g, and LDPE quality is 495g.In advance 495gLDPE raw material is dried under 80 DEG C of conditions, after homogeneous LDPE and the activeconstituents stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane B through single screw rod inflation film manufacturing machine.
Embodiment 3:
Choosing active substance is that BHA, BHT and TA are used in conjunction with, and mass concentration is 0.5%, and all the other are PP.Active substance and PP total amount are defined as 500g, and BHA, BHT and TA quality are 2.5g, and PP quality is 492.5g.In advance 492.5gPP raw material is dried under 80 DEG C of conditions; After homogeneous PP raw material and the active substance stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane C through single screw rod inflation film manufacturing machine.
Embodiment 4:
Choose active substance BHA and BHT and be used in conjunction with, and mass concentration is 0.5%, all the other are PP.Active substance and PP total amount are defined as 500g, and BHA and BHT quality are 2.5g, and PP quality is 495g.In advance 495gPP is dried under 80 DEG C of conditions; After homogeneous PP and the active substance stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane D through single screw rod inflation film manufacturing machine.
Embodiment 5:
Choosing active substance is that BHA, BHT and TA are used in conjunction with, and mass concentration is 0.5%, and all the other are EVOH.Active substance and EVOH total amount are defined as 500g, and BHA, BHT and TA quality are 2.5g, and EVOH quality is 492.5g.In advance 492.5gEVOH raw material is dried under 80 DEG C of conditions.After homogeneous EVOH raw material and the active substance stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane E through single screw rod inflation film manufacturing machine.
Embodiment 6:
Choose active substance BHA and BHT and be used in conjunction with, and mass concentration is 0.5%, all the other are EVOH.Active substance and EVOH total amount are defined as 500g, and BHA and BHT quality are 2.5g, and EVOH quality is 495g.In advance 495gEVOH raw material is dried under 80 DEG C of conditions.After homogeneous EVOH raw material and the active substance stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane F through single screw rod inflation film manufacturing machine.
Embodiment 7:
Choosing activeconstituents is that BHA, BHT and TA are used in conjunction with, and three's mass ratio is 1:1:1, and three's mass concentration is 0.1%, and all the other are LDPE.The total amount of activeconstituents and LDPE is defined as 500g, and BHA, BHT and TA quality are 0.5g, and LDPE quality is 498.5g.In advance 498.5gLDPE is dried under 80 DEG C of conditions.After homogeneous LDPE and the described activeconstituents stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane a through single screw rod inflation film manufacturing machine.
Embodiment 8:
Choose activeconstituents BHA and BHT and be used in conjunction with, and mass concentration is 0.1%, both mass ratioes are 1:1, and all the other are LDPE.Activeconstituents and LDPE total amount are defined as 500g, and BHA and BHT quality are 0.5g, and LDPE quality is 499g.In advance 499gLDPE raw material is dried under 80 DEG C of conditions; After homogeneous LDPE and the activeconstituents stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane b through single screw rod inflation film manufacturing machine.
Embodiment 9:
Choosing active substance is that BHA, BHT and TA are used in conjunction with, and mass concentration is 0.1%, and all the other are PP.Active substance and PP total amount are defined as 500g, and BHA, BHT and TA quality are 0.5g, and PP quality is 498.5g.In advance 498.5gPP raw material is dried under 80 DEG C of conditions; After homogeneous PP raw material and the active substance stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane c through single screw rod inflation film manufacturing machine.
Embodiment 10:
Choose active substance BHA and BHT and be used in conjunction with, and mass concentration is 0.1%, all the other are PP.Active substance and PP total amount are defined as 500g, and BHA and BHT quality are 0.5g, and PP quality is 499g.In advance 499gPP is dried under 80 DEG C of conditions; After homogeneous PP and the active substance stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane d through single screw rod inflation film manufacturing machine.
Embodiment 11:
Choosing active substance is that BHA, BHT and TA are used in conjunction with, and mass concentration is 0.1%, and all the other are EVOH.Active substance and EVOH total amount are defined as 500g, and BHA, BHT and TA quality are 0.5g, and EVOH quality is 498.5g.In advance 498.5gEVOH raw material is dried under 80 DEG C of conditions.After homogeneous EVOH raw material and the active substance stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane e through single screw rod inflation film manufacturing machine.
Embodiment 12:
Choose active substance BHA and BHT and be used in conjunction with, and mass concentration is 0.1%, all the other are EVOH.Active substance and EVOH total amount are defined as 500g, and BHA and BHT quality are 0.5g, and EVOH quality is 499g.In advance 499gEVOH raw material is dried under 80 DEG C of conditions.After homogeneous EVOH raw material and the active substance stirring after drying, prepare modification through dual-screw pelletizer, the modified resin particles thereof obtaining is made to food fresh keeping membrane f through single screw rod inflation film manufacturing machine.
Comparative example 1:
In advance 500gPP raw material is dried under 80 DEG C of conditions.PP raw material after drying, through dual-screw pelletizer granulation, is made to control group preservative film G by the resin particle obtaining through single screw rod inflation film manufacturing machine.
Comparative example 2:
In advance 500gPE raw material is dried under 80 DEG C of conditions.PE raw material after drying, through dual-screw pelletizer granulation, is made to control group preservative film H by the resin particle obtaining through single screw rod inflation film manufacturing machine.
Comparative example 3:
In advance 500gEVOH raw material is dried under 80 DEG C of conditions.EVOH raw material after drying, through the granulation of torque rheometer dual-screw pelletizer, is made to control group preservative film I by the resin particle obtaining through single screw rod inflation film manufacturing machine.
Get appropriate cold fresh meat, be divided into 15 equal portions, respectively corresponding cold fresh meat A, cold fresh meat B, cold fresh meat C, cold fresh meat D, cold fresh meat E, cold fresh meat F, cold fresh meat a, cold fresh meat b, cold fresh meat c, cold fresh meat d, cold fresh meat e, cold fresh meat f, cold fresh meat G(comparative example 1), cold fresh meat H(comparative example 2), cold fresh meat I(comparative example 3), be respectively test group and control group after the preservative film A-I packaging adopting in embodiment 1-9.PH and the total volatile basic nitrogen (TVB-N) of test group and control group after storage 2d, 4d, 6d, 8d, 10d are detected respectively.Experimental result is as follows:
Table one: TVB-N:
Data are known thus, and experimental group a-f, A-F group total volatile basic nitrogen value rising speed, lower than control group G-I, shows that the preservative film fresh-keeping effect that is added with activeconstituents is better than the preservative film that does not add BHA, BHT, TA; In addition, A-F group total volatile basic nitrogen value rising speed is lower than a-f group, A-F organize the corrupt speed of cold fresh meat protein will be lower than a-f group, show that active component content reaches 0.5% fresh-keeping effect and is better than 0.1%.
Table two: pH
The known experimental group a-f of data, A-F group pH value changes and all can experience the trend that first declines and raise afterwards thus, but A-F, a-f organize pH value rising speed lower than control group G-I group, show that the preservative film fresh-keeping effect that is added with activeconstituents is better than the preservative film that does not add BHA, BHT, TA; In addition, A-F group pH value rising speed is lower than a-f group, also shows that active component content reaches 0.5% fresh-keeping effect and is better than 0.1%, matches with TVB-N data variation.
In sum, it is comparatively suitable that the preservative film that the present invention is added with activeconstituents is chosen 0.5% content at active substance composition.
The Bactericidal test of film:
The biocidal property of film embodies by the size of the inhibition zone to tested bacterium on solid medium, and the tested bacterium of this experiment is chosen streptococcus aureus and intestinal bacteria.In gnotobasis, pipette the tested bacterium liquid of 200 μ L to containing in substratum plate of having made, then the 6mm circular membrane sample of accomplishing fluently with punch tool is in advance attached in the middle of culture dish.In bacterium liquid, bacterial content is 1x108CFU/mL rank.Cultivate 24h in the constant incubator of 37 DEG C after, measure antibacterial circle diameter, antibacterial circle diameter (mm)=bacteriostatic diameter (mm)
Experimental result is as follows:
Colibacillary inhibition zone
The inhibition zone of streptococcus aureus
Known compared with control group by experimental result, experimental group A-F all has biocidal property, and E group biocidal property is best, E, and F group inhibition zone is greater than other groups, and in experimental group a-f, except e, other groups are basic indifference compared with control group.
Fig. 1 is preservative film of the present invention and the pH value correlation curve figure of control group preservative film under same time;
As shown in Figure 1 at the storage initial stage, may be because pork does not freeze, the respiratory activity of meat tissue cell enlivens and makes flesh Glycolysis and ATP decomposition in muscle, produce respectively the acidic substance such as lactic acid, phosphoric acid, cause meat sample pH to reduce gradually, along with the prolongation of storage time, due to the effect of the protease of endogenous proteinase in meat and microorganism secretion, degraded muscle protein is many skins and amino acid, and discharges basic group, thereby the pH value of meat is gone up.In the detection period of 10 days, along with the prolongation of time, E group pH value is minimum, and changes more steady.And other groups pH value generally will be higher than EVOH group.
Fig. 2 preservative film A-F group of the present invention and the total volatile basic nitrogen correlation curve figure of control group preservative film under same time;
Total volatile basic nitrogen belongs to protein degradation production, and the content of these degradation productions and the freshness of animal food have obvious corresponding relation, so index can be evaluated the freshness of animal food.As shown in Figure 2, along with the prolongation of storage time, the total volatile basic nitrogen value of all samples is the trend of rising to total volatile basic nitrogen changing conditions, and its reason is that in meat, protein is broken down into the nitrogenous substances such as ammonia and amine.At first 4 days of storage, respectively organize difference little, but along with the prolongation experimental group total volatile basic nitrogen of time will be far below control group, in experimental group, E class value is minimum, other group total volatile basic nitrogen values generally will be higher than EVOH group, and this is consistent with the detected result of pH.
In sum, embodiment is that EVOH coordinates active substance 0.5%BHA, 0.5%BHT and 0.5%TA to have best fresh-keeping effect, and therefore preferably this is combined as examples produce scheme.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although the present invention is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. a food fresh keeping membrane, is characterized in that, its raw material comprises polymeric resin matrix film and activeconstituents; The mass concentration of described activeconstituents is 0.1%-0.5%;
Described macromolecule resin basement membrane comprises the one in LDPE, PP, EVOH; Described activeconstituents comprises that mass ratio is the BHA of 1:1 and the mixture of BHT.
2. food fresh keeping membrane according to claim 1, is characterized in that, described activeconstituents comprises TA, and the mass ratio of described BHA:BHT:TA is 1:1:1.
3. food fresh keeping membrane according to claim 1, is characterized in that, the mass concentration of described activeconstituents is 0.5%.
4. a preparation method for food fresh keeping membrane, is characterized in that, comprises the following steps:
(1), prepare activeconstituents, the BHA that is 1:1 by mass ratio and BHT, mix the homogeneous activeconstituents required for the present invention that obtains;
(2), preparation modification, the activeconstituents that the macromolecule resin basement membrane of drying in 80 DEG C of baking ovens is in advance made with step 1 mixes fully, stirs homogeneously, passes through that twin screw extruder heats, shears, extrudes, pelletizing finally makes modified resin; Wherein, described macromolecule resin basement membrane comprises one or more in LDPE, PP, EVOH; The mass concentration of described activeconstituents is 0.1%-0.5%;
(3) modified resin, step 2 being made is prepared into food fresh keeping membrane of the present invention by single screw rod inflation film manufacturing machine blown film.
5. the preparation method of food fresh keeping membrane according to claim 4, is characterized in that, in described step 1, activeconstituents also comprises TA, and the mass ratio of described BHA, BHT, TA is 1:1:1.
6. according to the preparation method of food fresh keeping membrane described in claim 4 or 5, it is characterized in that, in step 2, while preparing modified resin, described twin screw extruder is provided with seven heating zone from entrance successively to outlet, and wherein, district's Heating temperature is 165 DEG C, two district's Heating temperatures are 185 DEG C, three district's Heating temperatures are 190 DEG C, and four district's Heating temperatures are 190 DEG C, and five district's Heating temperatures are 180 DEG C, six district's Heating temperatures are 175 DEG C, and seven district's Heating temperatures are 170 DEG C.
7. the preparation method of food fresh keeping membrane according to claim 4, it is characterized in that, in step 3, when blown film, single screw rod inflation film manufacturing machine is disposed with four heating zone from entrance to outlet, wherein, district's Heating temperature is 150 DEG C, and two district's Heating temperatures are 185 DEG C, three district's Heating temperatures are 190 DEG C, and four district's Heating temperatures are 198 DEG C.
8. the preparation method of food fresh keeping membrane according to claim 5, it is characterized in that, in step 3, when blown film, single screw rod inflation film manufacturing machine is disposed with four heating zone from entrance to outlet, wherein, district's Heating temperature is 160 DEG C, and two district's Heating temperatures are 180 DEG C, three district's Heating temperatures are 180 DEG C, and four district's Heating temperatures are 175 DEG C.
9. the preparation method of food fresh keeping membrane according to claim 4, is characterized in that, the screw rod speed of rotation of described twin screw extruder, single screw rod inflation film manufacturing machine is 40r/min.
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