CN108976697A - A kind of food fresh keeping membrane resistant to high temperature and preparation method thereof - Google Patents

Abstract

The invention discloses a kind of food fresh keeping membranes resistant to high temperature, including below according to the raw material of parts by weight: 52-74 parts of phenolic resin, 15-28 parts of sisal leaves, 15-28 parts of crape myrtle petal, 13-26 parts of pulullan polysaccharide, 3-6 parts of fire retardant, 2-5 parts of emulsifier.Food fresh keeping membrane of the invention can effectively inhibit bacterial growth, extend the holding time of food, while have ultralow dimensional stability to heating in house, and tensile strength with higher, more secure and reliable to use, have vast market prospect.

Description

A kind of high temperature resistant food preservation film and preparation method thereof

technical field

The invention relates to the scope of food preservation, in particular to a high temperature resistant food preservation film and a preparation method thereof.

Background technique

Cling film is a kind of plastic packaging product, which is usually made of ethylene as the masterbatch through polymerization reaction. Cling film can be divided into three categories: the first is polyethylene, referred to as PE; the second is polyvinyl chloride, referred to as PVC ; The third is polyvinylidene chloride, referred to as PVDC. Microwave food heating, refrigerator food preservation, fresh and cooked food packaging and other occasions are widely used in family life, supermarkets, hotels and restaurants, and food packaging in industrial production.

The performance of traditional plastic wraps in terms of high temperature resistance is mostly unsatisfactory, and the reliability and safety of use are low. At the same time, the antibacterial effect is not significant, and it is easy to cause food deterioration.

Contents of the invention

The object of the present invention is to provide a high-temperature-resistant food preservation film and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

To achieve the above object, the present invention provides the following technical solutions:

A high temperature resistant food preservation film, comprising the following raw materials in parts by weight: 52-74 parts of phenolic resin, 15-28 parts of sisal leaves, 15-28 parts of crape myrtle petals, 13-26 parts of pullulan polysaccharide, flame retardant 3-6 parts of agent, 2-5 parts of emulsifier.

As a further solution of the present invention: include the following raw materials in parts by weight: 57-69 parts of phenolic resin, 17-26 parts of sisal leaves, 17-26 parts of crape myrtle petals, 16-23 parts of pullulan polysaccharide, 4 parts of flame retardant -5 parts, emulsifier 2.5-4.5 parts.

As a further solution of the present invention: include the following raw materials in parts by weight: 62 parts of phenolic resin, 22 parts of sisal leaves, 22 parts of crape myrtle petals, 19 parts of pullulan, 4.5 parts of flame retardant, and 3 parts of emulsifier.

As a further solution of the present invention: the flame retardant is tributyl phosphate, tris (2-ethylhexyl) phosphate, tris (2-chloroethyl) phosphate or tris (2,3-dichloro One of the propyl) esters.

As a further solution of the present invention: the emulsifier is one of hydrogenated rosin glycerides, rosin glycerides, glyceryl monostearate, hexapolyglycerol monooleate or hexapolyglycerol monostearate.

The preparation method of described high temperature resistant food preservation film, comprises the following steps:

1) Weigh the phenolic resin, disperse the phenolic resin into an ethanol solution that is 8-10 times its mass, and stir at 200-400rpm at 27-35°C for 3-5min to obtain a phenolic resin dispersion;

2) Weighing the pullulan, dissolving the pullulan in distilled water whose mass is 2-4 times its mass, to prepare a pullulan solution;

3) combining the phenolic resin dispersion and the pullulan solution, placing them in an ultrasonic processor, and ultrasonically treating them at a temperature of 140°C-220°C for 3-6h to obtain a modified phenolic resin dispersion;

4) Weigh the sisal leaves and crape myrtle petals, add 14-15 times the weight of the two to extract twice, each time the extraction temperature is 70-72 °C, the extraction time is 1.5-1.6h, and combine Two extractions are concentrated to 20-25% of the original volume to obtain a concentrated solution;

5) Combine the modified phenolic resin dispersion and concentrate, stir at 600-800rpm at 120°C-180°C for 15-26min, weigh the flame retardant and emulsifier during this period, and put the two into it in batches , to prepare a slurry;

6) Dry the slurry at 35-65°C to constant weight to obtain the finished product.

As a further solution of the present invention: the concentration of the ethanol solution in the step 1) is 20%.

As a further solution of the present invention: in the step 5), the flame retardant and the emulsifier are added at least twice.

Compared with prior art, the beneficial effect of the present invention is:

The food preservation film of the present invention can effectively inhibit the growth of bacteria, prolong the storage time of food, has ultra-low thermal shrinkage rate, high tensile strength, is safer and more reliable in use, and has broad market prospects.

Detailed ways

The technical solution of this patent will be further described in detail below in conjunction with specific embodiments.

Example 1

A high-temperature-resistant food preservation film, comprising the following raw materials in parts by weight: 52 parts of phenolic resin, 15 parts of sisal leaves, 15 parts of crape myrtle petals, 13 parts of pullulan polysaccharide, 3 parts of flame retardant, and 2 parts of emulsifier .

The flame retardant is tributyl phosphate.

The emulsifier is hydrogenated rosin glyceride.

The preparation method of the food preservation film of high temperature resistance in the present embodiment may further comprise the steps:

1) Weigh the phenolic resin, disperse the phenolic resin into an ethanol solution that is 8 times its mass, and stir at 200 rpm for 3 minutes at 27°C to obtain a phenolic resin dispersion;

2) Weighing the pullulan polysaccharide, dissolving the pullulan polysaccharide in distilled water whose mass is 2 times its mass, to prepare a pullulan polysaccharide solution;

3) Combine the phenolic resin dispersion and the pullulan solution, place them in an ultrasonic processor, and perform ultrasonic treatment at a temperature of 140° C. for 3 hours to obtain a modified phenolic resin dispersion;

4) Weigh the sisal leaves and crape myrtle petals, add 14 times the mass of the two to extract twice, each time the extraction temperature is 70 ° C, the extraction time is 1.5h, and the two extraction solutions are combined, Concentrate to 20% of the original volume to obtain a concentrate;

5) Combine the modified phenolic resin dispersion and concentrate, stir at 600 rpm for 15 minutes at 120°C, during which time the flame retardant and emulsifier are weighed, and the two are added in batches to prepare a slurry;

6) Dry the slurry at 35° C. to constant weight to obtain the finished product.

The concentration of the ethanol solution in the step 1) is 20%.

In the step 5), the flame retardant and the emulsifier are added at least twice.

Example 2

A high temperature resistant food preservation film, comprising the following raw materials in parts by weight: 57 parts of phenolic resin, 17 parts of sisal leaves, 17 parts of crape myrtle petals, 16 parts of pullulan polysaccharide, 4 parts of flame retardant, 2.5 parts of emulsifier .

The flame retardant is tris(2-ethylhexyl) phosphate.

The emulsifier is rosin glyceride.

The preparation method of the food preservation film of high temperature resistance in the present embodiment may further comprise the steps:

1) Weigh the phenolic resin, disperse the phenolic resin into an ethanol solution 10 times its mass, and stir at 300 rpm for 3 minutes at 30°C to obtain a phenolic resin dispersion;

2) Weighing the pullulan polysaccharide, dissolving the pullulan polysaccharide in distilled water whose mass is 2 times its mass, to prepare a pullulan polysaccharide solution;

3) Combine the phenolic resin dispersion and the pullulan solution, place them in an ultrasonic processor, and perform ultrasonic treatment at a temperature of 160° C. for 3 hours to obtain a modified phenolic resin dispersion;

4) Weigh the sisal leaves and crape myrtle petals, add 14 times the mass of the two to extract twice, each time the extraction temperature is 70 ° C, the extraction time is 1.4h, combine the two extraction solutions, Concentrate to 20% of the original volume to obtain a concentrate;

5) Combine the modified phenolic resin dispersion and concentrate, stir at 600 rpm for 15 minutes at 120°C, during which time the flame retardant and emulsifier are weighed, and the two are added in batches to prepare a slurry;

6) Dry the slurry at 47° C. to constant weight to obtain the finished product.

The concentration of the ethanol solution in the step 1) is 20%.

In the step 5), the flame retardant and the emulsifier are added at least twice.

Example 3

A high temperature resistant food preservation film, comprising the following raw materials in parts by weight: 62 parts of phenolic resin, 22 parts of sisal leaves, 22 parts of crape myrtle petals, 19 parts of pullulan polysaccharide, 4.5 parts of flame retardant, 3 parts of emulsifier .

The flame retardant is tris(2-chloroethyl) phosphate.

Described emulsifier is glyceryl monostearate.

The preparation method of the food preservation film of high temperature resistance in the present embodiment may further comprise the steps:

1) Weigh the phenolic resin, disperse the phenolic resin into an ethanol solution that is 8 times its mass, and stir at 200 rpm for 3 minutes at 27°C to obtain a phenolic resin dispersion;

2) Weighing the pullulan polysaccharide, dissolving the pullulan polysaccharide in distilled water whose mass times is 3 times its mass, to prepare the pullulan polysaccharide solution;

3) Combine the phenolic resin dispersion and the pullulan solution, place them in an ultrasonic processor, and perform ultrasonic treatment at a temperature of 140° C. for 3 hours to obtain a modified phenolic resin dispersion;

4) Weigh the sisal leaves and crape myrtle petals, add 14 times the mass of the two to extract twice, each time the extraction temperature is 70 ° C, the extraction time is 1.5h, and the two extraction solutions are combined, Concentrate to 20% of the original volume to obtain a concentrate;

5) Combine the modified phenolic resin dispersion and concentrate, stir at 700 rpm for 15 minutes at 120°C, during which time the flame retardant and emulsifier are weighed, and the two are added in batches to prepare a slurry;

6) Dry the slurry to a constant weight at 52° C. to obtain the finished product.

The concentration of the ethanol solution in the step 1) is 20%.

In the step 5), the flame retardant and the emulsifier are added at least twice.

Example 4

A high-temperature-resistant food preservation film, comprising the following raw materials in parts by weight: 69 parts of phenolic resin, 25 parts of sisal leaves, 25 parts of crape myrtle petals, 19 parts of pullulan, 5 parts of flame retardant, and 3 parts of emulsifier .

The flame retardant is tributyl phosphate.

Described emulsifier is six polyglycerol monostearate.

The preparation method of the food preservation film of high temperature resistance in the present embodiment may further comprise the steps:

1) Weigh the phenolic resin, disperse the phenolic resin into an ethanol solution that is 8 times its mass, and stir at 200 rpm for 3 minutes at 27°C to obtain a phenolic resin dispersion;

2) Weighing the pullulan polysaccharide, dissolving the pullulan polysaccharide in distilled water whose mass is 2 times its mass, to prepare a pullulan polysaccharide solution;

3) Combine the phenolic resin dispersion and the pullulan solution, place them in an ultrasonic processor, and perform ultrasonic treatment at a temperature of 140° C. for 3 hours to obtain a modified phenolic resin dispersion;

4) Weigh the sisal leaves and crape myrtle petals, add 14 times the mass of the two to extract twice, each time the extraction temperature is 70 ° C, the extraction time is 1.5h, and the two extraction solutions are combined, Concentrate to 20% of the original volume to obtain a concentrate;

5) Combine the modified phenolic resin dispersion and concentrate, stir at 600 rpm for 15 minutes at 120°C, during which time the flame retardant and emulsifier are weighed, and the two are added in batches to prepare a slurry;

6) Dry the slurry at 45° C. to constant weight to obtain the finished product.

The concentration of the ethanol solution in the step 1) is 20%.

In the step 5), the flame retardant and the emulsifier are added at least twice.

Example 5

A high temperature resistant food preservation film, comprising the following raw materials in parts by weight: 69 parts of phenolic resin, 26 parts of sisal leaves, 26 parts of crape myrtle petals, 23 parts of pullulan polysaccharide, 5 parts of flame retardant, 4.5 parts of emulsifier .

The flame retardant is tributyl phosphate.

The emulsifier is hexaglyceryl monostearate.

The preparation method of the food preservation film of high temperature resistance in the present embodiment may further comprise the steps:

1) Weigh the phenolic resin, disperse the phenolic resin into an ethanol solution 10 times its mass, and stir at 400 rpm for 5 minutes at 29°C to obtain a phenolic resin dispersion;

2) Weighing the pullulan polysaccharide, dissolving the pullulan polysaccharide in distilled water whose mass is 4 times its mass, to prepare a pullulan polysaccharide solution;

3) Combine the phenolic resin dispersion and the pullulan solution, place them in an ultrasonic processor, and perform ultrasonic treatment at a temperature of 140° C. for 3 hours to obtain a modified phenolic resin dispersion;

4) Weigh the sisal leaves and crape myrtle petals, add 14 times the mass of the two to extract twice, each time the extraction temperature is 70 ° C, the extraction time is 1.5h, and the two extraction solutions are combined, Concentrate to 20% of the original volume to obtain a concentrate;

5) Combine the modified phenolic resin dispersion and concentrate, stir at 700 rpm for 15 minutes at 120°C, during which time the flame retardant and emulsifier are weighed, and the two are added in batches to prepare a slurry;

6) Dry the slurry at 60° C. to constant weight to obtain the finished product.

The concentration of the ethanol solution in the step 1) is 20%.

In the step 5), the flame retardant and the emulsifier are added at least twice.

Example 6

A high-temperature-resistant food preservation film, comprising the following raw materials in parts by weight: 74 parts of phenolic resin, 28 parts of sisal leaves, 28 parts of crape myrtle petals, 26 parts of pullulan, 6 parts of flame retardant, and 5 parts of emulsifier .

The flame retardant is tris(2,3-dichloropropyl) phosphate.

Described emulsifier is six polyglycerol monostearate.

The preparation method of the food preservation film of high temperature resistance in the present embodiment may further comprise the steps:

1) Weigh the phenolic resin, disperse the phenolic resin into an ethanol solution that is 10 times its mass, and stir at 400 rpm for 5 minutes at 35°C to obtain a phenolic resin dispersion;

2) Weighing the pullulan polysaccharide, dissolving the pullulan polysaccharide in distilled water whose mass is 4 times its mass, to prepare a pullulan polysaccharide solution;

3) Combine the phenolic resin dispersion and the pullulan solution, place them in an ultrasonic processor, and perform ultrasonic treatment at a temperature of 220° C. for 6 hours to obtain a modified phenolic resin dispersion;

4) Weigh the sisal leaves and crape myrtle petals, add 15 times the mass of the two to extract twice, each time the extraction temperature is 72 ° C, the extraction time is 1.6h, combine the two extraction solutions, Concentrate to 25% of the original volume to obtain a concentrate;

5) Combine the modified phenolic resin dispersion and concentrate, stir at 800 rpm for 26 minutes at 180°C, during which time the flame retardant and emulsifier are weighed, and the two are put into it in batches to prepare a slurry;

6) Dry the slurry at 65° C. to constant weight to obtain the finished product.

The concentration of the ethanol solution in the step 1) is 20%.

In the step 5), the flame retardant and the emulsifier are added at least twice.

Comparative example 1: compared with embodiment 3, does not contain sisal leaf, other is identical with embodiment 3.

Comparative example 2: compared with embodiment 3, does not contain crape myrtle petals, other is the same as embodiment 3.

Comparative example 3: compared with embodiment 3, only containing sisal leaves, crape myrtle petals and phenolic resin, others are the same as embodiment 3.

Performance test:

1. High temperature resistance test

The thermal shrinkage rate and tensile strength of the separators prepared in Example 3 and Comparative Examples 1-3 were tested, and the test results are shown in Table 1.

Table 1

2. Antibacterial test

Experience by the size of the inhibition zone of the test bacteria on the solid medium, select Staphylococcus aureus and Escherichia coli, and pipette 200ul of the test bacteria solution into the prepared culture medium plate under a sterile environment , and then stick the 6mm circular film sample pre-selected with a puncher to the middle of the petri dish, and measure the diameter of the inhibition zone (mm) after cultivating in a constant temperature incubator for 24h. There are four groups in total, respectively using embodiment 3 and pair The results of the side view of the plastic wrap corresponding to ratios 1-3 are shown in Table 2.

Table 2

Group/Project Staphylococcus aureus zone of inhibition Escherichia coli zone of inhibition Example 3 12 10 Comparative example 1 5 4 Comparative example 2 3.5 5 Comparative example 3 2.5 4

In conjunction with the data corresponding to Example 3 in Table 1 and Table 2, it can be seen that the food preservation film of the present invention has an ultra-low thermal shrinkage rate, excellent high temperature resistance, and can effectively inhibit bacterial growth simultaneously;

In conjunction with the corresponding data of Example 3 and Comparative Example 1-3 in Table 1 and Table 2, it can be seen that the reason why the present invention can perform excellently in high temperature resistance and bacteriostatic performance is that the interaction between each component The synergy has had unexpected effects.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only includes an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (8)

1. a kind of food fresh keeping membrane resistant to high temperature, which is characterized in that including below according to the raw material of parts by weight: phenolic resin 52- 74 parts, 15-28 parts of sisal leaves, 15-28 parts of crape myrtle petal, 13-26 parts of pulullan polysaccharide, 3-6 parts of fire retardant, 2-5 parts of emulsifier.

2. food fresh keeping membrane resistant to high temperature according to claim 1, which is characterized in that including below according to the original of parts by weight Material: 57-69 parts of phenolic resin, 17-26 parts of sisal leaves, 17-26 parts of crape myrtle petal, 16-23 parts of pulullan polysaccharide, fire retardant 4-5 Part, 2.5-4.5 parts of emulsifier.

3. food fresh keeping membrane resistant to high temperature according to claim 1, which is characterized in that including below according to the original of parts by weight Material: 62 parts of phenolic resin, 22 parts of sisal leaves, 22 parts of crape myrtle petal, 19 parts of pulullan polysaccharide, 4.5 parts of fire retardant, 3 parts of emulsifier.

4. food fresh keeping membrane resistant to high temperature according to claim 1, which is characterized in that the fire retardant is tricresyl phosphate fourth One of ester, tri-2-ethylhexyl phosphate, tricresyl phosphate (2- chloroethyl) ester or tricresyl phosphate (2,3- bis- chloropropyl) ester.

5. food fresh keeping membrane resistant to high temperature according to claim 1, which is characterized in that the emulsifier is that hydrogenated rosin is sweet One of grease, rosin glycerides, glycerin monostearate, six polyglycerol monooleates or six polyglycerol monostearates.

6. a kind of preparation method of food fresh keeping membrane resistant to high temperature a method as claimed in any one of claims 1 to 5, which is characterized in that including Following steps:

1) weigh phenolic resin, by phenolic resin dispersion to be 8-10 times of its quality ethanol solution in, with 200-400rpm 3-5min is stirred in the environment of 27-35 DEG C, phenolic resin dispersion liquid is made；

2) pulullan polysaccharide is weighed, it is that it is more that Propiram is made in its 2-4 times distilled water that pulullan polysaccharide, which is dissolved in quality again, Sugar juice；

3) merge phenolic resin dispersion liquid and pulullan polysaccharide solution, be placed in processor for ultrasonic wave, in 140 DEG C -220 DEG C of temperature Degree is lower to be ultrasonically treated 3-6h, obtains phenol-formaldehyde resin modified dispersion liquid；

4) sisal leaves and crape myrtle petal are weighed, the dehydrated alcohol that 14-15 times of quality times of the two is added extracts 2 times, every time extraction temperature Degree is 70-72 DEG C, extraction time 1.5-1.6h, merges leaching liquor twice, is concentrated into the 20-25% of original volume, and concentration is made Liquid；

5) merge phenol-formaldehyde resin modified dispersion liquid and concentrate, 15- is stirred in the environment of 120 DEG C -180 DEG C with 600-800rpm During which 26min weighs fire retardant and emulsifier, the two will be entered wherein in batches, slurries are made；

6) it dries to constant weight in the environment of slurries being 35-65 DEG C to get finished product.

7. the preparation method of food fresh keeping membrane resistant to high temperature according to claim 6, which is characterized in that in the step 1) The concentration of ethanol solution is 20%.

8. the preparation method of food fresh keeping membrane resistant to high temperature according to claim 6, which is characterized in that in the step 5) Fire retardant and emulsifier are at least added in two portions.