阅读说明：本技术 一种乙烯利催熟包装袋及其制备方法 (Ethephon ripening packaging bag and preparation method thereof ) 是由 曹崇江 曹宇璇 袁彪 黄德春 程抒劼 于 2019-09-05 设计创作，主要内容包括：本发明公开了一种乙烯利催熟包装袋及其制备方法,该包装袋的原料包括：乙烯利、LDPE、LLDPE、硅胶、分散剂、润滑剂和偶联剂。其制备方法是先将各原料混合,再将混合原料经由双螺杆挤压机混炼造粒、吹膜机吹膜,然后将得到的膜材料制成包装袋。本发明通过直接将乙烯利与包装袋结合的方式,巧妙乙烯利的催熟作用,降低了乙烯利的催熟成本,使用方便,避免了乙烯利液体直接与水果接触产生毒性的隐患,并且能够减少乙烯利在果蔬表面的残留,提高果蔬催熟的安全性。(The invention discloses a ethephon ripening packaging bag and a preparation method thereof, and the packaging bag comprises the following raw materials: ethephon, LDPE, LLDPE, silica gel, a dispersant, a lubricant and a coupling agent. The preparation method comprises the steps of mixing the raw materials, carrying out mixing granulation on the mixed raw materials through a double-screw extruder, blowing a film through a film blowing machine, and preparing the obtained film material into a packaging bag. The method has the advantages that the ethephon is directly combined with the packaging bag, the ripening acceleration effect of the ethephon is ingenious, the ripening acceleration cost of the ethephon is reduced, the use is convenient, the hidden danger that the ethephon liquid directly contacts with the fruits to generate toxicity is avoided, the residue of the ethephon on the surfaces of the fruits and vegetables can be reduced, and the safety of ripening of the fruits and vegetables is improved.)

1. The utility model provides a ethephon ripening packaging bag which characterized in that: the raw materials comprise the following components in percentage by weight: 3-5% of ethephon, 36-42% of LDPE, 36-42% of LLDPE, 0.1-0.5% of silica gel, 8-12% of dispersant, 0.5-1.5% of lubricant and 1-3% of coupling agent; the sum of the weight percentages of all the raw materials is 100 percent.

2. The ethephon ripening packaging bag of claim 1, wherein: the dispersant is glyceryl monostearate.

3. The ethephon ripening packaging bag of claim 1, wherein: the lubricant is ethylene bis stearamide.

4. The ethephon ripening packaging bag of claim 1, wherein: the coupling agent is a silane coupling agent KH-570.

5. The method for preparing a ethephon ripening packaging bag according to claim 1, wherein: the method comprises the following steps:

step 1, weighing ethephon, thermoplastic resin polyethylene, silica gel, a dispersing agent, a lubricating agent and a coupling agent, and mixing;

step 2, mixing and granulating the mixed raw materials by a double-screw extruder;

step 3, blowing the granulated ethephon master batch by a film blowing machine;

and 4, preparing the film material obtained in the step 3 into a packaging bag.

6. The method of claim 5, wherein: in the step 2, the screw rotating speed of the double-screw extruder is 60-150r/min, and the temperatures of all sections of the extruder are respectively set to be 120 ℃, 130 ℃ and 130 ℃.

7. The method of claim 5, wherein: the film blowing temperature in step 3 was 135 ℃.

Technical Field

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

Background

Unripe fruits are "green" and generally hard and not sweet. While green comes from its chlorophyll, astringent from its tannins, hard is mainly a function of pectin, and not sweet because starch has not been converted to sugar. By the time it is supposed to mature, ethylene is produced in the plant. The production of ethylene causes changes in the various parts of the fruit: enzymes are used for decomposing chlorophyll, even new pigments are generated, so that green color disappears, and red, yellow and the like represent mature colors; some kinases break down acids and make fruits neutral; amylase hydrolyzes starch to sugar to produce sweetness; pectinase breaks down some pectin, thereby softening the fruit; some enzymes decompose specific compounds in fruits to release certain gases, so that different fruits have different flavors. Fruit growers often pick and store fruits when the fruits are not ripe for sale, and consumers do not buy unripe fruits, so that proper ripening is necessary.

Ethephon can be used as plant growth regulator, and can release ethylene from root, stem, leaf, flower, fruit, etc. to regulate plant metabolism, growth and development, promote ripening, exfoliation, aging and flowering, promote flowering, and promote transformation of melon sex such as fructus litchi and arillus longan, kill citrus, regulate pineapple flowering, and cucumber. The fruit post-harvest treatment agent can also be used for promoting the softening and yellowing of bananas, mangoes and papayas, the green and yellow turning of lemon, navel orange, orange peels and the like, the softening and astringent taste of persimmons, the precocity of tomatoes and watermelons and the like (high junfeng, correct recognition and use of ethylene, ethephon [ A ]. Henan plant pathology society, Henan plant disease research progress-Henan plant pathology and modern agriculture academic discussion collection [ C ]. Henan plant pathology society: Henan plant pathology society, 2011: 2.).

At present, ethylene gas ripening is adopted in the market, ethephon liquid ripening is adopted, and a small ripening medicine bag is used for ripening. The ethylene gas ripening cost is high, which is not beneficial to popularization; the ethephon liquid is used for ripening and directly contacts with fruits, and toxicity is remained; before use, the small ripening medicine bag needs to be soaked in clear water and put into a box for release. The research on ripening by adopting the packaging bag is few, and the ethephon is combined with the packaging bag, so that the cost can be reduced, and the residual quantity of the ethephon on the surfaces of the fruits and vegetables can be reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a ethephon ripening accelerating packaging bag and a preparation method thereof.

A ethephon ripening packaging bag comprises the following raw materials in percentage by weight: 3-5% of ethephon, 36-42% of LDPE, 36-42% of LLDPE, 0.1-0.5% of silica gel, 8-12% of dispersant, 0.5-1.5% of lubricant and 1-3% of coupling agent; the sum of the weight percentages of all the raw materials is 100 percent.

Further, the dispersant is Glycerol Monostearate (GMS).

Further, the lubricant is Ethylene Bis Stearamide (EBS).

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

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

step 1, weighing ethephon, thermoplastic resin polyethylene, silica gel, a dispersing agent, a lubricating agent and a coupling agent, and mixing;

step 2, mixing and granulating the mixed raw materials by a double-screw extruder;

step 3, blowing the granulated ethephon master batch by a film blowing machine;

and 4, preparing the film material obtained in the step 3 into a packaging bag.

Further, in the step 2, the screw rotating speed of the double-screw extruder is 60-150r/min, and the temperatures of all sections of the extruder are respectively set to be 120 ℃, 130 ℃ and 130 ℃.

Further, the film blowing temperature in step 3 was 135 ℃.

Has the advantages that: compared with the traditional methods of ripening by ethylene gas, ripening by ethephon liquid, ripening by a small ripening medicine bag and the like on the market, the method adopts a double-screw extrusion system to extrude and granulate the ethephon ripening growth regulator, the thermoplastic resin material and the silica gel desiccant by coextrusion, and then uses a film blowing machine to blow a film, so that the ethephon is uniformly distributed in the ripening material; and the preparation method simulates an industrialized production process, the method is simple and mature, and the mechanical property of the material is stable. The obtained packaging bag has uniformly dispersed ethephon and can exert excellent long-acting ripening acceleration effect.

Drawings

FIG. 1 is a photograph of fresh samples of bananas stored in plain PE bags and ethephon bags in example 1.

Fig. 2 is photographs of 3 days, 6 days and 9 days after bananas are stored in a common PE package and a ethephon package in example 1, wherein the 3 rd, 6 th and 9 th days are taken from the left to the right, and the upper row of the photographs is the common PE package and the lower row is the ethephon package.

FIG. 3 is a graph showing the measured color difference between bananas stored in a common PE package and a ethephon package in example 1.

Detailed Description

The technical solution of the present invention is further illustrated by the following specific examples.

All materials used in the examples were commercially available except where specifically indicated.