阅读说明：本技术 一种可生物降解的果蔬用网套发泡材料及其制备方法 (Biodegradable mesh cover foaming material for fruits and vegetables and preparation method thereof ) 是由 许亮 陶慷 洪江 李瑞龙 焦旗 于 2021-07-29 设计创作，主要内容包括：本发明涉及发泡材料技术领域,具体涉及一种可生物降解的果蔬用网套发泡材料及其制备方法。该可生物降解的果蔬用网套发泡材料按质量份数计,包括如下原料组分：可生物降解聚合物80～90份,扩链剂0.5～2份,纳米改性剂1～10份,物理发泡剂3～10份,润滑剂0.1～1份,抗菌剂1～3份。本发明所制备的可生物降解的果蔬用网套发泡材料的发泡倍率为1～20倍,不仅具有优异的韧性和弹性,还具有良好的生物降解性能和抗菌性能,能够有效解决传统果蔬网套存在的因其不可生物降解而导致环境污染的技术问题。(The invention relates to the technical field of foaming materials, in particular to a biodegradable net cover foaming material for fruits and vegetables and a preparation method thereof. The biodegradable mesh sleeve foaming material for fruits and vegetables comprises the following raw material components in parts by weight: 80-90 parts of biodegradable polymer, 0.5-2 parts of chain extender, 1-10 parts of nano modifier, 3-10 parts of physical foaming agent, 0.1-1 part of lubricant and 1-3 parts of antibacterial agent. The biodegradable mesh sleeve foaming material for fruits and vegetables prepared by the invention has a foaming ratio of 1-20 times, not only has excellent toughness and elasticity, but also has good biodegradability and antibacterial property, and can effectively solve the technical problem of environmental pollution caused by non-biodegradability of the traditional fruit and vegetable mesh sleeve.)

1. A biodegradable mesh sleeve foaming material for fruits and vegetables is characterized by comprising the following raw material components in parts by weight:

biodegradable polymer: 80-90 parts of a solvent;

chain extender: 0.5-2 parts;

nano modifier: 1-10 parts;

physical foaming agent: 3-10 parts;

lubricant: 0.1-1 part;

antibacterial agents: 1-3 parts.

2. The biodegradable netting foam material of claim 1, wherein the biodegradable polymer comprises any one or more of PLA, PBAT, PBS and PHA.

3. The biodegradable netting foam material for fruits and vegetables according to claim 1, wherein the chain extender comprises any one of epoxy chain extender, glycidyl methacrylate and ethylene-methyl methacrylate copolymer.

4. The biodegradable netting foaming material for fruits and vegetables according to claim 1, wherein the nano modifier comprises any one of nano silica, organic intercalated montmorillonite and nano calcium carbonate.

5. The biodegradable netting foam material for fruits and vegetables according to claim 1, wherein said physical foaming agent comprises any one of nitrogen, carbon dioxide and aliphatic hydrocarbons.

6. The biodegradable netting foam material for fruits and vegetables according to claim 1, wherein said lubricant comprises any one of zinc stearate, erucamide and ethylene bis stearamide.

7. The biodegradable fruit and vegetable net cover foaming material as claimed in claim 1, wherein the antibacterial agent comprises at least one of a metal ion type antibacterial agent and an oxide photocatalytic type antibacterial agent.

8. The biodegradable mesh cover foaming material for fruits and vegetables as claimed in claim 1, wherein the foaming ratio of the mesh cover foaming material for fruits and vegetables is 1-20 times.

9. The preparation method of the biodegradable mesh-cover foaming material for fruits and vegetables as claimed in any one of claims 1 to 8, characterized by comprising the following steps:

s1, respectively weighing the biodegradable polymer, the chain extender, the nano modifier, the lubricant and the antibacterial agent according to a certain mass ratio, uniformly mixing the raw material components in a mixer, and performing blending extrusion and grain cutting through a double-screw extruder to obtain modified particles;

and S2, adding the modified particles prepared in the step S1 into a feeding port of a net cover foaming device, simultaneously injecting a physical foaming agent into a compression section of a double-screw extruder, and foaming and shaping through a die opening to obtain the biodegradable net cover foaming material for fruits and vegetables.

Technical Field

The invention relates to the technical field of foaming materials, in particular to a biodegradable net cover foaming material for fruits and vegetables and a preparation method thereof.

Background

In recent years, with the rapid development of electronic commerce, the mode of selling agricultural products through an e-commerce channel is increasingly common. The fruits and vegetables are very easy to extrude, collide and damage in the long-distance transportation process after being picked, and the loss of the fruits and vegetables in the transportation process in China each year accounts for about 25% -45% of the total yield, so that how to protect the fruits and vegetables in the transportation process is very important. At present, the plastic foaming net cover is mainly adopted to protect the fruits and vegetables in the market, and the mechanical damage conditions of collision, extrusion and the like of the fruits and vegetables in transportation are improved. The advantages of the plastic foaming net cover include: (1) the fruit and vegetable cushion has good elasticity and softness, and can play a role in effectively buffering and damping, so that the fruit and vegetable are prevented from being damaged due to collision and extrusion in the storage and transportation process; (2) the weight is light, the cost is low, the transportation is convenient, and the transportation cost is reduced; (3) the color of the plastic foaming net sleeve can be changed by adding the pigment according to actual needs, thereby being beneficial to forming an admirable obvious color contrast with fruits and vegetables, improving the aesthetic effect and attracting consumers to purchase.

At present, the conventional plastic foaming net sleeve for fruits and vegetables is mainly prepared by foaming polyethylene, the polyethylene is difficult to degrade in natural environment, the fruit and vegetable net sleeve is a disposable product, the recycling and reusing difficulty is high, wastes can cause serious pollution to the environment, and the burden is increased for the environment protection work. Therefore, the biodegradable fruit and vegetable net cover needs to be developed to replace the conventional non-degradable fruit and vegetable net cover so as to relieve the serious 'white pollution' problem at present.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a biodegradable mesh cover foaming material for fruits and vegetables and a preparation method thereof. The biodegradable mesh sleeve foaming material for fruits and vegetables provided by the invention has excellent toughness and elasticity, good biodegradability and antibacterial property, and can effectively solve the technical problem of environmental pollution caused by non-biodegradability of the traditional fruit and vegetable mesh sleeve.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a biodegradable mesh sleeve foaming material for fruits and vegetables comprises the following raw material components in parts by weight:

biodegradable polymer: 80 to 90 portions of

Chain extender: 0.5 to 2 portions of

Nano modifier: 1 to 10 parts of

Physical foaming agent: 3 to 10 portions of

Lubricant: 0.1 to 1 portion

Antibacterial agents: 1 to 3 portions of

In certain embodiments, the biodegradable polymer comprises any one or more of PLA, PBAT, PBS, and PHA.

In certain embodiments, the chain extender comprises any one of an epoxy-based chain extender, glycidyl methacrylate, and an ethylene-methyl methacrylate copolymer.

In certain embodiments, the nano-modifier comprises any one of nano-silica, organically intercalated montmorillonite, and nano-calcium carbonate.

In certain embodiments, the physical blowing agent comprises any one of nitrogen, carbon dioxide, and aliphatic hydrocarbons.

In certain embodiments, the lubricant comprises any one of zinc stearate, erucamide, and ethylene bis-stearamide.

In certain embodiments, the antimicrobial agent comprises at least one of a metal ion type antimicrobial agent and an oxide photocatalytic antimicrobial agent.

In some embodiments, the foaming ratio of the fruit and vegetable mesh cover foaming material is 1-20 times.

The invention also provides a method for preparing the biodegradable net cover foaming material for fruits and vegetables, which comprises the following steps:

s1, respectively weighing the biodegradable polymer, the chain extender, the nano modifier, the lubricant and the antibacterial agent according to a certain mass ratio, uniformly mixing the raw material components in a mixer, and performing blending extrusion and grain cutting through a double-screw extruder to obtain modified particles;

and S2, adding the modified particles prepared in the step S1 into a feeding port of a net cover foaming device, simultaneously injecting a physical foaming agent into a compression section of a double-screw extruder, and foaming and shaping through a die opening to obtain the biodegradable net cover foaming material for fruits and vegetables.

Compared with the traditional non-biodegradable fruit and vegetable net cover, the invention has the following beneficial effects:

the net cover foaming material for the fruits and the vegetables provided by the invention has good toughness, elasticity, biodegradability and antibacterial property, the preparation method is simple, the operation is convenient, the production cost is low, and the prepared net cover foaming material for the fruits and the vegetables can be widely applied to products which are easy to collide and damage in the transportation and storage processes of the fruits, the vegetables and the like. The biodegradable polymer is adopted as the raw material, and the prepared net cover foaming material for the fruits and the vegetables can be degraded under the action of natural microorganisms and finally converted into carbon dioxide, water and other small molecular substances harmless to the environment, so that the biodegradation performance is excellent, and the pollution to the environment is avoided. According to the invention, rigid inorganic nanoparticles are added as a modifier, when the rigid inorganic nanoparticles are acted by external force, the nanoparticles generate a stress concentration effect in a resin matrix, and simultaneously, the matrix resin generates yield and plastic deformation to absorb external acting force, so that the toughness and mechanical strength of the net cover foaming material for fruits and vegetables are improved, and the shock absorption and protection effects on the fruits and vegetables in the transportation process are favorably improved. According to the invention, the antibacterial agent is added, so that the net cover foaming material for the fruits and vegetables has a good antibacterial effect, and the fruits and vegetables can be effectively prevented from being invaded by microorganisms in the transportation and storage processes of the fruits and vegetables.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description, which should be understood that the following examples are only illustrative of the preferred embodiments of the present invention, show and describe the basic principles, main features and advantages of the present invention, and are only illustrative and explanatory of the present invention, but not restrictive thereof.

Example 1

The biodegradable mesh cover foaming material for fruits and vegetables provided by the embodiment comprises the following raw materials in parts by weight:

72 parts of PLA, 8 parts of PBAT, 1 part of epoxy chain extender XY-4370, 10 parts of organic intercalated montmorillonite, 1 part of ethylene bis stearamide, 2 parts of silver ion antibacterial agent and 6 parts of physical foaming agent butane.

The biodegradable mesh sleeve foaming material for fruits and vegetables prepared by the embodiment comprises the following steps:

s1, respectively weighing PLA, PBAT, an epoxy chain extender XY-4370, organic intercalated montmorillonite, ethylene bis stearamide and a silver ion antibacterial agent according to the mass parts, putting the raw material components into a mixing machine together, uniformly mixing, and then carrying out blending extrusion and grain cutting through a double-screw extruder to obtain modified particles;

s2, adding the modified particles prepared in the step S1 into a feeding port of a net cover foaming device, simultaneously injecting a physical foaming agent butane into a compression section of a double-screw extruder, and foaming and shaping through a die opening to obtain the biodegradable net cover foaming material for fruits and vegetables.

The foaming ratio of the material is determined according to the volume increase ratio of the finished product of the foaming material to the raw material particles, and the foaming ratio of the net cover foaming material for fruits and vegetables prepared in the embodiment is 15 times.

Example 2

The biodegradable mesh cover foaming material for fruits and vegetables provided by the embodiment comprises the following raw materials in parts by weight:

63 parts of PLA, 27 parts of PBS, 0.5 part of glycidyl methacrylate, 5 parts of nano-silica, 1 part of erucamide, 1.5 parts of zinc oxide and 2 parts of nitrogen serving as a physical foaming agent.

The biodegradable mesh sleeve foaming material for fruits and vegetables prepared by the embodiment comprises the following steps:

s1, respectively weighing PLA, PBS, glycidyl methacrylate, nano silicon dioxide, erucamide and zinc oxide according to the mass parts, putting the raw material components into a mixer together, uniformly mixing, and performing blending extrusion and grain cutting through a double-screw extruder to obtain modified particles;

s2, adding the modified particles prepared in the step S1 into a feeding port of a net cover foaming device, simultaneously injecting nitrogen serving as a physical foaming agent into a compression section of a double-screw extruder, and foaming and shaping through a die opening to obtain the biodegradable net cover foaming material for fruits and vegetables.

The foaming ratio of the material is determined according to the volume increase ratio of the finished product of the foaming material to the raw material particles, and the foaming ratio of the net cover foaming material for fruits and vegetables prepared in the embodiment is 3 times.

Example 3

The biodegradable mesh cover foaming material for fruits and vegetables provided by the embodiment comprises the following raw materials in parts by weight:

64 parts of PLA, 16 parts of PHA, 1 part of ethylene-methyl methacrylate copolymer, 10 parts of nano calcium carbonate, 1 part of zinc stearate, 3 parts of silver ion antibacterial agent and 5 parts of physical foaming agent carbon dioxide.

The biodegradable mesh sleeve foaming material for fruits and vegetables prepared by the embodiment comprises the following steps:

s1, respectively weighing PLA, PHA, ethylene-methyl methacrylate copolymer, nano calcium carbonate, zinc stearate and a silver ion antibacterial agent according to the mass parts, putting the raw material components into a mixer together, uniformly mixing, and then carrying out blending extrusion and grain cutting through a double-screw extruder to obtain modified particles;

s2, adding the modified particles prepared in the step S1 into a feeding port of a net cover foaming device, simultaneously injecting carbon dioxide serving as a physical foaming agent into a compression section of a double-screw extruder, and foaming and shaping through a die opening to obtain the biodegradable net cover foaming material for fruits and vegetables.

The foaming ratio of the material is determined according to the volume increase ratio of the finished product of the foaming material to the raw material particles, and the foaming ratio of the net cover foaming material for fruits and vegetables prepared in the embodiment is 7 times.

Example 4

The biodegradable mesh cover foaming material for fruits and vegetables provided by the embodiment comprises the following raw materials in parts by weight:

86 parts of PLA, 1.9 parts of glycidyl methacrylate, 1 part of nano silicon dioxide, 0.1 part of zinc stearate, 1 part of nano titanium dioxide silver antibacterial agent and 10 parts of physical foaming agent carbon dioxide.

The biodegradable mesh sleeve foaming material for fruits and vegetables prepared by the embodiment comprises the following steps:

s1, respectively weighing PLA, glycidyl methacrylate, nano silicon dioxide, zinc stearate and a nano titanium dioxide silver antibacterial agent according to the mass parts, putting the raw material components into a mixer together, uniformly mixing, and then carrying out blending extrusion and grain cutting through a double-screw extruder to obtain modified particles;

s2, adding the modified particles prepared in the step S1 into a feeding port of a net cover foaming device, simultaneously injecting carbon dioxide serving as a physical foaming agent into a compression section of a double-screw extruder, and foaming and shaping through a die opening to obtain the biodegradable net cover foaming material for fruits and vegetables.

The foaming ratio of the material is determined according to the volume increase ratio of the finished product of the foaming material to the raw material particles, and the foaming ratio of the net cover foaming material for fruits and vegetables prepared in the embodiment is 10 times.

The biodegradable mesh sleeve foaming material for fruits and vegetables provided by embodiments 1-4 of the invention has the advantages of simple and convenient preparation method, low manufacturing cost and suitability for batch production, and the provided mesh sleeve foaming material for fruits and vegetables has excellent mechanical properties, good rebound resilience and excellent biodegradability, is suitable for transportation and storage of fruits and vegetables, and can play a good role in shock absorption and protection.

Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.