CN110607016A - A kind of ethephon ripening packaging bag and preparation method thereof - Google Patents

Abstract

The invention discloses an ethephon ripening packing bag and a preparation method thereof. The raw materials of the packing bag include: ethephon, LDPE, LLDPE, silica gel, dispersant, lubricant and coupling agent. The preparation method is as follows: firstly mixing various raw materials, then kneading and granulating the mixed raw materials through a twin-screw extruder, blowing a film by a film blowing machine, and then making the obtained film material into a packaging bag. In the present invention, by directly combining ethephon with the packaging bag, the ripening effect of ethephon is ingenious, the cost of ripening ethephon is reduced, the use is convenient, and the hidden danger of toxicity caused by the direct contact of ethephon liquid with fruit is avoided, and it can Reduce the residue of ethephon on the surface of fruits and vegetables, and improve the safety of ripening fruits and vegetables.

Description

A kind of ethephon ripening packaging bag and preparation method thereof

technical field

The invention belongs to the technical field of food packaging, and in particular relates to an ethephon ripening packaging bag and a preparation method thereof.

Background technique

Unripe fruit is "green," generally firm and not sweet. The greenness comes from the chlorophyll in it, the astringency comes from the tannins in it, the hardness is mainly due to the function of pectin, and the lack of sweetness is because the starch has not been converted into sugar. By the time it is time to mature, ethylene will be produced in the plant. The production of ethylene will cause changes in various parts of the fruit: there are enzymes to decompose chlorophyll, and even new pigments are produced, so the green disappears, while red, yellow, etc. represent ripe colors; some kinases decompose the acid and make the fruit tends to be neutral; amylase hydrolyzes starch into sugar to produce sweetness; pectinase decomposes some pectin, thereby making the fruit soft; and some enzymes decompose specific compounds in the fruit to release certain gases, So different fruits have different aromas. Fruit farmers often pick and store the fruit before it is ripe for sale, and consumers will not buy unripe fruit, so proper ripening is necessary.

Ethephon can be used as a plant growth regulator, which can release ethylene in the roots, stems, leaves, flowers, fruits and other tissues of plants to regulate plant metabolism, growth and development, and play a physiological role in accelerating maturity, shedding, aging and promoting flowering. It can be used to promote flowering and fruit preservation of litchi and longan, kill shoots of citrus, regulate pineapple flowering, and promote gender transformation of cucumbers and other melons. It can also be used to promote the softening and yellowing of bananas, mangoes and papayas in the post-harvest treatment of fruits, the degreening and yellowing of lemon, navel orange, and citrus peels, the softening and astringency of persimmons, and the early maturity of tomatoes and watermelons, etc. (Gao Junfeng. Correct understanding and the use of ethylene and ethephon [A]. Henan Society of Phytopathology. Research progress on plant diseases in Henan Province - Proceedings of Henan Symposium on Phytopathology and Modern Agriculture [C]. Henan Phytopathology Society: Plants in Henan Province Society of Pathology, 2011: 2.).

Currently on the market, ethylene gas is used to accelerate ripening, ethephon liquid is used to accelerate ripening, and "small ripening kits" are used to accelerate ripening. The high cost of ethylene gas ripening is not conducive to popularization; the ripening of ethephon liquid is directly in contact with the fruit, and the residual toxicity; the small medicine package for ripening needs to be soaked in clean water before use, and put into the box for release. However, there are few studies on the use of packaging bags for ripening. Combining ethephon with packaging bags can not only reduce the cost, but also reduce the residual amount of ethephon on the surface of fruits and vegetables.

Contents of the invention

The purpose of the present invention is to address the deficiencies in the prior art above, to provide a kind of ethephon ripening packaging bag and its preparation method, by directly combining ethephon with the packaging bag, the ripening effect of ethephon is ingenious, reducing the The cost of ripening is low, and it is easy to use. It avoids the hidden danger of toxicity caused by direct contact of ethephon liquid with fruits, and can reduce the residue of ethephon on the surface of fruits and vegetables, improving the safety of ripening fruits and vegetables.

An ethephon ripening packaging bag, raw materials include: ethephon 3-5%, LDPE 36-42%, LLDPE 36-42%, silica gel 0.1-0.5%, dispersant 8-12%, lubricant 0.5-1.5%, coupling agent 1-3%; the weight percentage sum of all raw materials is 100%.

Further, the dispersant is glyceryl monostearate (GMS).

Further, the lubricant is ethylene bis stearic acid amide (EBS).

Further, the coupling agent is silane coupling agent KH-570.

The preparation method of above-mentioned ethephon ripening packaging bag comprises the following steps:

Step 1, weighing ethephon, thermoplastic resin polyethylene, silica gel, dispersant, lubricant, coupling agent, and mixing;

Step 2, mixing and granulating the mixed raw materials by a twin-screw extruder;

Step 3, blowing the ethephon masterbatch obtained by granulation through a film blowing machine;

In step 4, the film material obtained in step 3 is made into a packaging bag.

Further, the screw speed of the twin-screw extruder in step 2 is 60-150r/min, and the temperature of each section of the extruder is respectively set to 120°C, 130°C, 130°C, 130°C, 130°C, 130°C and 130°C .

Further, the film blowing temperature in step 3 is 135°C.

Beneficial effects: Compared with the traditional ethylene gas ripening, ethephon liquid ripening, and "ripening small drug pack" ripening methods on the market, the present invention adopts a twin-screw extrusion system to make ethephon ripening growth regulator , Thermoplastic resin material and silica gel desiccant are co-extruded and granulated, and then blown with a film blowing machine, so ethephon is evenly distributed in the ripening material; and the preparation method imitates the industrial production process, the method is simple and mature, and the mechanical properties of the material are stable . The obtained packaging bag has evenly dispersed ethephon, and can exert an excellent and long-acting ripening effect.

Description of drawings

Fig. 1 is the fresh sample photo that banana is stored in common PE packing and ethephon packing bag in embodiment 1.

Figure 2 is the photos of bananas stored in ordinary PE packaging and ethephon packaging bags for 3 days, 6 days, and 9 days in Example 1. From left to right, they are the samples of the 3rd day, the 6th day, and the 9th day , in each photo, the upper row is ordinary PE packaging, and the lower row is vinyl packaging bags.

Fig. 3 is the color difference detection value after banana is stored in common PE packaging and ethephon packaging bag in embodiment 1.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

Raw materials used in all examples are commercially available unless otherwise specified.

Example 1

An ethephon ripening packaging bag, the preparation method comprising the following steps:

(1) Preparation of ethephon master batch: taking the gross weight of the ethephon ripening packaging material as a benchmark, the mass proportion is: 4.92% of ethephon ripening growth regulator, LDPE (low density polyethylene) 41.49%, LLDPE (linear low-density polyethylene) 41.29%, silica gel desiccant 0.1%, dispersant 9%, lubricant 1%, coupling agent 2%; the mixed material is mixed and granulated by a twin-screw extruder, and the extrusion is adjusted Conditions: the screw speed is 60-150 r/min, and the temperature of each section of the extruder is set to 120°C, 130°C, 130°C, 130°C, 130°C, 130°C and 130°C respectively.

(2) Preparation of ethephon ripening packaging materials: The ethephon masterbatch obtained by granulation was blown into film by a film blowing machine at a temperature of 135°C, and the fruit and vegetable ripening packaging materials with slow-release properties were obtained.

Determination of ripening performance

Fresh fruits and vegetables were placed in the packaging bag prepared in Example 1 and the ordinary PE packaging bag for ripening performance test. Specifically, adopt the above-mentioned package to pack the bananas, test the hardness of the banana pulp on the 3rd, 6th, and 9th day, and observe the color change of the banana peel at the same time.

The hardness and texture index of banana pulp was determined by TMS-Pro texture analyzer of FTC Company in the United States. During the measurement, use a small knife to peel off the peel of one fruit surface of a single banana finger completely and evenly, then place the peeled face of the banana finger on the stage of the texture analyzer horizontally, and measure the texture index by radial puncture. Take one point at 2cm, take 5 points for each banana finger, repeat 3 times, and take the average value. During the measurement, a cylindrical probe with a diameter of 6mm was selected at room temperature and the TPA detection mode was used to measure the hardness, elasticity, adhesion, and chewiness of banana pulp; the TPA test parameters were specifically the initial force of 0.5N, and the speed before the test was 60mm/mL. After the test, the speed is 200mm/mL, the variable rate is 50%, and the dwell time between two compressions is 5s. The result is as follows:

Changes in firmness of bananas in different packages during storage

time (days) 3 6 9 Ordinary PE 528.521g 425.140g 340.464g vinyl bags 326.927g 326.095g 230.431g

Combining Figure 1, Figure 2, Figure 3 and the above table, it can be seen that on the third day of storage, the hardness of the bananas in the ethephon packaging bag is much smaller than that in the ordinary packaging bag, and the color is yellowish compared with that in the ordinary packaging bag; storage On the 6th day, the hardness of the bananas in the ethephon packaging bag did not change much compared with the storage for 3 days, but it was still lower than that of the ordinary packaging bag. From the perspective of color, the bananas in the ethephon packaging bag had completely turned yellow, while the bananas in the ordinary packaging bag had completely turned yellow. The bananas in the bag were still green; on the ninth day of storage, the bananas in the ethephon packaging bag had rotted, while the bananas in the ordinary packaging bag were hard enough to be eaten, but their color was still greenish, which affected consumers' desire to buy. The ripening packaging bag of the present invention has a strong ripening effect and can effectively accelerate the post-ripening of bananas. It can be seen from the figure that the color of the bananas under the ethephon packaging bag changes rapidly as the storage days change. , can achieve the effect of accelerating the ripening of bananas.

Example 2

An ethephon ripening packaging bag, the preparation method comprising the following steps:

(1) Preparation of ethephon masterbatch: taking the gross weight of the ethephon ripening packaging material as a benchmark, the mass proportion is: 2.52% of ethephon ripening growth regulator, LDPE (low density polyethylene) 42.69%, LLDPE (linear low-density polyethylene) 42.69%, silica gel desiccant 0.1%, dispersant 9%, lubricant 1%, coupling agent 2%; mixed and granulated by twin-screw extruder, adjusting extrusion conditions, The screw speed is 60-150r/min, and the temperature of each section of the extruder is set to 120°C, 130°C, 130°C, 130°C, 130°C, 130°C and 130°C respectively.

(2) Preparation of ethephon ripening packaging materials: The ethephon masterbatch obtained by granulation was blown into film by a film blowing machine at a temperature of 135°C, and the fruit and vegetable ripening packaging materials with slow-release properties were obtained.

Example 3

An ethephon ripening packaging bag, the preparation method comprising the following steps:

(1) Preparation of ethephon master batch: taking the gross weight of the ethephon ripening packaging material as a benchmark, the mass proportion is: 3.60% of ethephon ripening growth regulator, LDPE (low density polyethylene) 42.15%, LLDPE (linear low-density polyethylene) 42.15%, silica gel desiccant 0.1%, dispersant 9%, lubricant 1%, coupling agent 2%; by twin-screw extruder mixing granulation, adjust extrusion conditions, The screw speed is 60-150r/min, and the temperature of each section of the extruder is set to 120°C, 130°C, 130°C, 130°C, 130°C, 130°C and 130°C respectively.

(2) Preparation of ethephon ripening packaging materials: The ethephon masterbatch obtained by granulation was blown into film by a film blowing machine at a temperature of 135°C, and the fruit and vegetable ripening packaging materials with slow-release properties were obtained.

Claims (7)

1. A kind of ethephon ripening packing bag is characterized in that: raw material comprises by weight percent: ethephon 3-5%, LDPE36-42%, LLDPE 36-42%, silica gel 0.1-0.5%, dispersant 8- 12%, lubricant 0.5-1.5%, coupling agent 1-3%; the sum of weight percentages of all raw materials is 100%. 2. The ethephon ripening packaging bag according to claim 1, characterized in that: the dispersant is glyceryl monostearate. 3. The ethephon ripening packaging bag according to claim 1, characterized in that: the lubricant is ethylene bis stearic acid amide. 4. The ethephon ripening packaging bag according to claim 1, characterized in that: the coupling agent is a silane coupling agent KH-570. 5. the preparation method of the ethephon ripening packing bag described in claim 1, is characterized in that: comprise the following steps: Step 1, weighing ethephon, thermoplastic resin polyethylene, silica gel, dispersant, lubricant, coupling agent, and mixing; Step 2, mixing and granulating the mixed raw materials by a twin-screw extruder; Step 3, blowing the ethephon masterbatch obtained by granulation through a film blowing machine; In step 4, the film material obtained in step 3 is made into a packaging bag. 6. The preparation method according to claim 5, characterized in that: the screw speed of the twin-screw extruder in step 2 is 60-150 r/min, and the temperature of each section of the extruder is respectively set to 120°C, 130°C, 130°C, 130°C, 130°C, 130°C and 130°C. 7. The preparation method according to claim 5, characterized in that: in step 3, the film blowing temperature is 135°C.