阅读说明：本技术 一种使用性能稳定的可降解食品包装材料的加工方法 (Processing method of degradable food packaging material with stable service performance ) 是由 独少培 于 2019-11-26 设计创作，主要内容包括：本发明公开了一种使用性能稳定的可降解食品包装材料的加工方法,包括如下步骤：S1、硅藻土粉碎处理；S2、硅藻土煅烧处理；S3、硅藻土高温反应处理；S4、硅藻土改性处理；S5、物质称取备用；S6、混合物料制备；S7、成品制备。本发明在现有技术上进行了改进处理,工艺变化后仍较简单,易于推广应用,制得的包装材料具有强度高、使用稳定性好、耐温阻燃性佳、可印染加工性好、使用寿命长等优点。(The invention discloses a processing method of a degradable food packaging material with stable service performance, which comprises the following steps: s1, crushing diatomite; s2, calcining diatomite; s3, carrying out high-temperature reaction treatment on diatomite; s4, modifying diatomite; s5, weighing the materials for later use; s6, preparing a mixed material; s7, preparing a finished product. The invention is improved in the prior art, is simple after the process is changed, is easy to popularize and apply, and the prepared packaging material has the advantages of high strength, good use stability, good temperature resistance and flame retardance, good printing and dyeing processability, long service life and the like.)

1. A processing method of a degradable food packaging material with stable service performance is characterized by comprising the following steps:

s1, putting the diatomite into a pulverizer to be pulverized, and then sieving the pulverized diatomite by using a 300-mesh sieve for later use;

s2, putting the diatomite processed in the step S1 into a high-temperature calcining furnace for calcining, and taking out for later use after 1-1.5 hours;

s3, putting the diatomite processed in the step S2 into a reaction tank, introducing methane, hydrogen and nitrogen into the reaction tank, heating to keep the temperature in the reaction tank at 960-980 ℃, preserving heat for 50-55 min, and taking out for later use;

s4, immersing the diatomite processed in the step S3 into the modification solution, continuously performing ultrasonic treatment for 30-40 min, filtering, washing with deionized water once, and finally drying for 3-5 h for later use; the modifying solution is composed of the following substances in parts by weight: 6-8 parts of vinyl trimethoxy silane, 2-4 parts of sodium dodecyl benzene sulfonate, 1-2 parts of disodium ethylene diamine tetraacetate, 3-5 parts of fatty alcohol-polyoxyethylene ether and 120-130 parts of deionized water;

s5, weighing the following substances in parts by weight: 20-25 parts of phosphate starch, 8-10 parts of cyclodextrin, 2-4 parts of chitosan, 3-6 parts of soybean protein, 1-2 parts of epoxidized soybean oil, 1.5-2.5 parts of citric acid, 12-15 parts of cellulose, 4-8 parts of glycerol, 2-4 parts of gelatin, 3-5 parts of diatomite treated in the step S4 and 40-45 parts of deionized water;

s6, heating the deionized water weighed in the step S5 to 55-60 ℃, adding the phosphate starch weighed in the step S5, cyclodextrin, chitosan, soy protein, epoxidized soybean oil, citric acid, cellulose, glycerol, gelatin and the diatomite treated in the step S4 into the water, and continuously stirring uniformly to obtain a mixed material for later use;

s7, putting the mixed material prepared in the step S6 into a double-screw extruder for extrusion granulation, blowing the obtained granules for molding, and cooling after molding to obtain the finished product.

2. The method for processing the degradable food packaging material with stable service performance according to claim 1, wherein the temperature in the high temperature calcining furnace is controlled to be 650-700 ℃ during the calcining treatment in step S2.

3. The processing method of the degradable food packaging material with stable service performance as claimed in claim 1, wherein the flow rate of methane introduced in step S3 is 65-70 ml/min, the flow rate of hydrogen introduced is 95-100 ml/min, and the flow rate of nitrogen introduced is 600-700 ml/min.

4. The processing method of the degradable food packaging material with stable use performance according to claim 1, wherein the ultrasonic frequency is controlled to be 600-650 kHz during the ultrasonic treatment in the step S4; and during drying treatment, the drying temperature is controlled to be 80-85 ℃.

5. The method for processing the degradable food packaging material with stable use performance of claim 1, wherein the cyclodextrin in step S5 is β -cyclodextrin.

6. The processing method of the degradable food packaging material with stable service performance as claimed in claim 1, wherein the stirring speed is controlled to be 800-900 rpm during the stirring process in step S6.

7. The processing method of degradable food packaging material with stable use performance as claimed in claim 1, wherein the temperature of the first zone is controlled to be 150-155 ℃, the temperature of the second zone is controlled to be 160-165 ℃, and the temperature of the third zone is controlled to be 180-185 ℃ during extrusion by the twin-screw extruder in step S7; and the blow-up ratio is controlled to be 1: 3-4 during the film blowing forming treatment.

Technical Field

The invention belongs to the technical field of food packaging material processing and preparation, and particularly relates to a processing method of a degradable food packaging material with stable service performance.

Background

The food packaging material has wide application, food-grade packaging materials can be attached to the surfaces of some cooked foods, the packaging material consisting of a chemically synthesized high polymer material has certain limitation when being used for food packaging, and the packaging material prepared by the chemical synthesis method can limit the use of the packaging material because the packaging material is not edible. Chitosan is a high molecular natural component, and due to the outstanding physical properties of chitosan, the chitosan is used in food packaging for more research. Chitosan alone, used in food packaging, also has certain disadvantages, which are not high in its corresponding elongation at break. If the chitosan is combined with other food-grade high polymer materials to be applied to the preparation of the food film material, the mechanical property of the food film material can be effectively improved, and the utilization space of the food film material is increased. If the application number is: 201410404618.4 discloses a food packaging material, wherein the combination of chitosan and starch improves the overall strength of the material, but in practice, the strength of the material needs to be further improved to adapt to packaging in more food and fields, and the material has low temperature resistance, flame retardance and high use stability.

Disclosure of Invention

The invention aims to provide a processing method of a degradable food packaging material with stable service performance aiming at the existing problems.

The invention is realized by the following technical scheme:

a processing method of a degradable food packaging material with stable service performance comprises the following steps:

s1, putting the diatomite into a pulverizer to be pulverized, and then sieving the pulverized diatomite by using a 300-mesh sieve for later use;

s2, putting the diatomite processed in the step S1 into a high-temperature calcining furnace for calcining, and taking out for later use after 1-1.5 hours;

s3, putting the diatomite processed in the step S2 into a reaction tank, introducing methane, hydrogen and nitrogen into the reaction tank, heating to keep the temperature in the reaction tank at 960-980 ℃, preserving heat for 50-55 min, and taking out for later use;

s4, immersing the diatomite processed in the step S3 into the modification solution, continuously performing ultrasonic treatment for 30-40 min, filtering, washing with deionized water once, and finally drying for 3-5 h for later use; the modifying solution is composed of the following substances in parts by weight: 6-8 parts of vinyl trimethoxy silane, 2-4 parts of sodium dodecyl benzene sulfonate, 1-2 parts of disodium ethylene diamine tetraacetate, 3-5 parts of fatty alcohol-polyoxyethylene ether and 120-130 parts of deionized water;

s5, weighing the following substances in parts by weight: 20-25 parts of phosphate starch, 8-10 parts of cyclodextrin, 2-4 parts of chitosan, 3-6 parts of soybean protein, 1-2 parts of epoxidized soybean oil, 1.5-2.5 parts of citric acid, 12-15 parts of cellulose, 4-8 parts of glycerol, 2-4 parts of gelatin, 3-5 parts of diatomite treated in the step S4 and 40-45 parts of deionized water;

s6, heating the deionized water weighed in the step S5 to 55-60 ℃, adding the phosphate starch weighed in the step S5, cyclodextrin, chitosan, soy protein, epoxidized soybean oil, citric acid, cellulose, glycerol, gelatin and the diatomite treated in the step S4 into the water, and continuously stirring uniformly to obtain a mixed material for later use;

s7, putting the mixed material prepared in the step S6 into a double-screw extruder for extrusion granulation, blowing the obtained granules for molding, and cooling after molding to obtain the finished product.

Further, the temperature in the high-temperature calcining furnace is controlled to be 650 to 700 ℃ during the calcining treatment in step S2.

Further, in the step S3, the flow rate of methane is 65-70 ml/min, the flow rate of hydrogen is 95-100 ml/min, and the flow rate of nitrogen is 600-700 ml/min.

Further, the frequency of the ultrasonic wave is controlled to be 600-650 kHz during the ultrasonic treatment in the step S4; and during drying treatment, the drying temperature is controlled to be 80-85 ℃.

Further, the cyclodextrin in step S5 is β -cyclodextrin.

Further, the rotation speed of the stirring is controlled to be 800-900 rpm in the stirring treatment in step S6.

Further, the temperature of the first zone is controlled to be 150-155 ℃, the temperature of the second zone is controlled to be 160-165 ℃, and the temperature of the third zone is controlled to be 180-185 ℃ during extrusion by the double-screw extruder in the step S7; and the blow-up ratio is controlled to be 1: 3-4 during the film blowing forming treatment.

The invention carries out reasonable optimization and improvement on the processing method of the food packaging material, wherein phosphate starch, cyclodextrin, chitosan and the like are still used as matrix components, in order to further improve the overall use characteristic, a special diatomite filler is added, diatomite is a common filler component in the field, but the diatomite is easy to agglomerate when being filled and used, and simultaneously the bonding strength of the diatomite filler and the components such as starch is not high, so that the filling effect is not ideal, in the preparation of the special diatomite filler, the diatomite is calcined firstly, the specific surface area and the adsorption capacity of the diatomite are improved by utilizing high temperature, the tissue structure of the diatomite is optimized, then the diatomite is put into a reaction tank to be reacted with methane and the like, in a high-temperature environment, iron oxide contained in the diatomite is reduced into atomic state iron in a hydrogen atmosphere, iron atoms further catalyze the cracking of a methane carbon source, and then can grow out a certain amount of graphite alkene layer on the surface of diatomaceous earth and interlamination, this graphite alkene layer grows out because of direct reaction, it is closely stable with the tissue bonding of diatomaceous earth, its organizational structure has been improved, reuse modified liquid is soaked and is handled subsequently, active group such as silicon oxygen group has been fixed on diatomaceous earth and graphite alkene layer, the surface activity of diatomaceous earth and with starch etc. substrate material compatibility and bonding strength have been improved, and because of the formation of graphite alkene layer, holistic temperature resistance, adsorptivity, the binding capacity to printing ink etc. has all been improved, the use quality of material has correspondingly been improved, at last the blown film is extruded through the blending, obtain the finished product, obvious promotion its intensity characteristic and stability in use etc.

Compared with the prior art, the invention has the following advantages:

the invention is improved in the prior art, is simpler after the process is changed, is easy to popularize and apply, and the prepared packaging material has the advantages of high strength, good use stability, good temperature resistance and flame retardance, good printing and dyeing processability, long service life and the like, and is suitable for being used in more food types and conditions.

Detailed Description

A processing method of a degradable food packaging material with stable service performance comprises the following steps:

s1, putting the diatomite into a pulverizer to be pulverized, and then sieving the pulverized diatomite by using a 300-mesh sieve for later use;

s2, putting the diatomite processed in the step S1 into a high-temperature calcining furnace for calcining, and taking out for later use after 1-1.5 hours;

s3, putting the diatomite processed in the step S2 into a reaction tank, introducing methane, hydrogen and nitrogen into the reaction tank, heating to keep the temperature in the reaction tank at 960-980 ℃, preserving heat for 50-55 min, and taking out for later use;

s4, immersing the diatomite processed in the step S3 into the modification solution, continuously performing ultrasonic treatment for 30-40 min, filtering, washing with deionized water once, and finally drying for 3-5 h for later use; the modifying solution is composed of the following substances in parts by weight: 6-8 parts of vinyl trimethoxy silane, 2-4 parts of sodium dodecyl benzene sulfonate, 1-2 parts of disodium ethylene diamine tetraacetate, 3-5 parts of fatty alcohol-polyoxyethylene ether and 120-130 parts of deionized water;

s5, weighing the following substances in parts by weight: 20-25 parts of phosphate starch, 8-10 parts of cyclodextrin, 2-4 parts of chitosan, 3-6 parts of soybean protein, 1-2 parts of epoxidized soybean oil, 1.5-2.5 parts of citric acid, 12-15 parts of cellulose, 4-8 parts of glycerol, 2-4 parts of gelatin, 3-5 parts of diatomite treated in the step S4 and 40-45 parts of deionized water;

s6, heating the deionized water weighed in the step S5 to 55-60 ℃, adding the phosphate starch weighed in the step S5, cyclodextrin, chitosan, soy protein, epoxidized soybean oil, citric acid, cellulose, glycerol, gelatin and the diatomite treated in the step S4 into the water, and continuously stirring uniformly to obtain a mixed material for later use;

s7, putting the mixed material prepared in the step S6 into a double-screw extruder for extrusion granulation, blowing the obtained granules for molding, and cooling after molding to obtain the finished product.

Further, the temperature in the high-temperature calcining furnace is controlled to be 650 to 700 ℃ during the calcining treatment in step S2.

Further, in the step S3, the flow rate of methane is 65-70 ml/min, the flow rate of hydrogen is 95-100 ml/min, and the flow rate of nitrogen is 600-700 ml/min.

Further, the frequency of the ultrasonic wave is controlled to be 600-650 kHz during the ultrasonic treatment in the step S4; and during drying treatment, the drying temperature is controlled to be 80-85 ℃.

Further, the cyclodextrin in step S5 is β -cyclodextrin.

Further, the rotation speed of the stirring is controlled to be 800-900 rpm in the stirring treatment in step S6.

Further, the temperature of the first zone is controlled to be 150-155 ℃, the temperature of the second zone is controlled to be 160-165 ℃, and the temperature of the third zone is controlled to be 180-185 ℃ during extrusion by the double-screw extruder in the step S7; and the blow-up ratio is controlled to be 1: 3-4 during the film blowing forming treatment.

For further explanation of the present invention, reference will now be made to the following examples.